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  • Influence of handset components into the behavior of a handset antenna in a slotted ground plane

     Bujalance Jurado, Adrián; Picher, Cristina; Anguera Pros, Jaume; Andújar Linares, Aurora; Puente Baliarda, Carles
    Microwave and optical technology letters
    Date of publication: 2013-08
    Journal article

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    The influence of handset components needs to be analyced in order to optimize the integration of the antenna into a handset device.

  • Access to the full text
    Advances in antenna technology for wireless handheld devices  Open access

     Anguera Pros, Jaume; Andújar Linares, Aurora; Huynh, Minh-Chau; Orlenius, Charlie; Picher, Cristina; Puente Baliarda, Carles
    International journal of antennas and propagation
    Date of publication: 2013
    Journal article

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    The constant evolution of wireless handheld devices together with the apparition of multiple wireless communication systems fosters the antenna community to design new radiating and measurements systems capable of satisfying the market demands. It is an object of the present paper to provide an overview of the evolution that wireless handheld technology has experienced in the last years. In this sense, a description of the evolution of wireless handheld devices, regulations, challenges in today's smartphones, and handset characterization is reviewed. Finally, recent advances in antenna technology for wireless handheld or portable devices are presented.

    The constant evolution of wireless handheld devices together with the apparition of multiple wireless communication systems fosters the antenna community to design new radiating and measurements systems capable of satisfying the market demands. It is an object of the present paper to provide an overview of the evolution that wireless handheld technology has experienced in the last years. In this sense, a description of the evolution of wireless handheld devices, regulations, challenges in today’s smartphones, and handset characterization is reviewed. Finally, recent advances in antenna technology for wireless handheld or portable devices are presented.

  • Analysis of a multiband monopole handset antenna combined with a slotted ground plane

     Picher, Cristina; Anguera Pros, Jaume; Bujalance Jurado, Adrián; Andújar Linares, Aurora; Puente Baliarda, Carles
    Microwave and optical technology letters
    Date of publication: 2013-01-01
    Journal article

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    The ground plane of a handset device plays an important role in the radiation process. As a consequence, through a ground plane modification, it is possible to obtain a multiband performance while keeping small antenna dimensions. Numerical simulation using Method of Moments has been used to understand the effect of the slots and a prototype has been built to validate the solution. The proposal consists in a multiband planar monopole handset antenna featuring a small area of 13 mm 11 mm with a slotted ground plane operating in multiple communication standards (GSM850, GSM900, DCS, PCS, UMTS, LTE2300, WiMAX, Bluetooth, and Wi-Fi). Thanks to the presence of the slots, the bandwidth and efficiency results have been significantly improved.

    The ground plane of a handset device plays an important role in the radiation process. As a consequence, through a ground plane modification, it is possible to obtain a multiband performance while keeping small antenna dimensions. Numerical simulation using Method of Moments has been used to understand the effect of the slots and a prototype has been built to validate the solution. The proposal consists in a multiband planar monopole handset antenna featuring a small area of 13 mm x 11 mm with a slotted ground plane operating in multiple communication standards (GSM850, GSM900, DCS, PCS, UMTS, LTE2300, WiMAX, Bluetooth, and Wi-Fi). Thanks to the presence of the slots, the bandwidth and efficiency results have been significantly improved

  • Compact multiband antenna system for smartphone platforms

     Anguera Pros, Jaume; Picher, Cristina; Andújar Linares, Aurora; Puente Baliarda, Carles; Kahng, Sungtek
    European Conference on Antennas and Propagation
    Presentation's date: 2013-04
    Presentation of work at congresses

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    Smartphone are gainin interest due to its multifunctional capabilities. In order to facilitate the integration of an antenna system, a compact radiating system comprising non-resonant cubic elements radiating to provide multiband performance at GSM850, GSM900. GSM1800...

    Smartphone are gainin interest due to its multifunctional capabilities. In order to facilitate the integration of an antenna system, a compact radiating system comprising non-resonant cubic elements radiating to provide multiband performance at GSM850, GSM900. GSM1800...

  • Analysis of the human head interaction in handset antennas with slotted ground planes

     Picher, Cristina; Anguera Pros, Jaume; Puente Baliarda, Carles; Andújar Linares, Aurora; Kahng, Sungtek
    IEEE antennas and propagation magazine
    Date of publication: 2012
    Journal article

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  • Human head interaction over ground plane booster antenna technology: functional and biological analysis

     Anguera Pros, Jaume; Puente Baliarda, Carles; Andújar Linares, Aurora; Picher, Cristina
    Progress in electromagnetics research B
    Date of publication: 2012-06
    Journal article

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    Handset antennas strongly interact with the human body. When a user holds a handset during a phone call, the proximity of the human head considerably affects the antenna performance and eventually the quality of the wireless connection. Consequently, the assessment of the antenna parameters regarding free-space conditions is not enough to fully characterize the performance of handset antennas and a further analysis taking into account human head interaction is required. In this sense, this paper presents a study that deals with the human head interaction concerning two aspects: functional and biological. The first one analyzes the effect of the human head over the main antenna parameters (reflection coefficient, efficiency, and radiation pattern) whereas the second one evaluates the impact of the antenna over the human head in terms of Specific Absorption Rate (SAR). Four representative prototypes of radiating structures are measured in both conditions in order to compare their performance: a dual-band Planar Inverted F Antenna (PIFA), a hexa-band PIFA with a slotted ground plane, a set of coupled monopoles, and a new architecture referred as compact radiating system based on the excitation of the ground plane through a set of non-resonant ground plane boosters. A figure of merit that relates the antenna efficiency with the SAR values is proposed for comparison purposes. The results demonstrate that losses caused by the human head power absorption can be minimized if the antennas are placed in the edge located at a higher distance from the human cheek. Furthermore, the study reveals the robustness of the compact radiating system taking into account the human presence. This fact reinforces its position as an alternative solution to current handset antennas, capable of providing penta-band operation (GSM850/900, DCS, PCS, and UMTS) through ground plane boosters featured by their reduced volume of only 250 mm3.

  • Multiband handset antennas by combining monopoles and intelligent ground planes

     Picher, Cristina; Anguera Pros, Jaume; Puente Baliarda, Carles; Andújar Linares, Aurora; Bujalance Jurado, Adrián
    European Conference on Antennas and Propagation
    Presentation's date: 2012-03
    Presentation of work at congresses

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  • Analysis of some techniques to enhance the bandwidth of handset antennas using metallic strips

     Anguera Pros, Jaume; Picher, Cristina; Puente Baliarda, Carles; Andújar Linares, Aurora; Kahng, Sungtek
    European Conference on Antennas and Propagation
    Presentation's date: 2012-03
    Presentation of work at congresses

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  • Ground plane booster antenna technology

     Andújar Linares, Aurora; Anguera Pros, Jaume; Picher, Cristina; Puente Baliarda, Carles
    European Conference on Antennas and Propagation
    Presentation's date: 2012-03
    Presentation of work at congresses

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  • Interlaced multiband antenna arrays

     Puente Baliarda, Carles; Romeu Robert, Jordi; Blanch Boris, Sebastian
    Date of request: 2012-06-22
    Invention patent

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  • Multilevel antennas

     Puente Baliarda, Carles; Anguera Pros, Jaume; Borja Borau, M. Carmen; Soler Castany, Jordi
    Date of request: 2012-03-02
    Invention patent

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  • Tecnología Antenaless para dispositivos Wireless MIMO

     Andújar Linares, Aurora; Puente Baliarda, Carles
    Participation in a competitive project

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  • A mechanism to electrically enlarge the ground plane of handset antennas: A bandwidth enhancement technique

     Anguera Pros, Jaume; Andújar Linares, Aurora; Puente Baliarda, Carles
    Microwave and optical technology letters
    Date of publication: 2011-07
    Journal article

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    There is a need of developing new techniques for enhancing the bandwidth of handset antennas without increasing the antenna volume in order to incorporate more frequency bands into the cell phones. The technique to enhance the bandwidth proposed herein consists in adding a conductive strip connected to the ground plane at the opposite edge of the handset antenna location. Conductive strip tunes the ground plane mode to effectively improve the bandwidth at the low frequency region (∼900 MHz) while keeping the same antenna volume. An electrical model is used to give an insight into the behavior concluding that the conductive strip is a useful mechanism to improve the bandwidth. The model demonstrates that the length of the conductive strip can be reduced by inductive or dielectric loading, as well as by reducing its height. Simulations and measurements show how the conductive strip excites the resonance of the ground plane mode improving the bandwidth and validating the electrical model predictions. The proposed technique is applied to a dual-band (900–1800 MHz) planar inverted F-antenna providing a measured bandwidth enhancement of 1.6 times when using the strip at the low frequency region while keeping the same performance at the high frequency region (∼1800 MHz).

  • Ground Plane Boosters as a Compact Antenna Technology for Wireless Handheld Devices

     Anguera Pros, Jaume; Puente Baliarda, Carles; Andújar Linares, Aurora
    IEEE transactions on antennas and propagation
    Date of publication: 2011-05
    Journal article

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  • Ground plane boosters to provide multi-band operation in wireless handheld devices

     Andújar Linares, Aurora; Anguera Pros, Jaume; Puente Baliarda, Carles
    European Conference on Antennas and Propagation
    Presentation's date: 2011-04-12
    Presentation of work at congresses

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    Recent demand for multifunctional wireless devices has increased the challenge for the antenna designe rs, who has to address it by providing small antennas able to oper ate in multiple communication standards. This paper propos es a new generation of radiating systems capable of providin g multi-band operation without the need of including a dedicated antenna. The solution is based on the excitation of a structure already existing in any wireless handheld device, the ground plane. Said excitation is carried out through a pair of booster s with dimensions 5 mm x 5 mm x 5 mm, especially designed to transfer the maximum power to the efficient ground plane rad iation mode. In addition, a radiofrequency system is combi ned with the booster-based radiating structure in order to provi de penta-band operation. The feasibility of the proposal has been tested by electromagnetic simulations as well as by experimen tal measurements. Furthermore the human head interactio n concerning Specific Absorption Rate (SAR) has been analyzed and a proposal for its reduction is presented. As a result a promising standard solution for a radiating system capable to operate in the main communication standards GSM850, GSM900, DCS, PCS and UMTS is provided with a volume reduction factor around 20 compared with current te chnologies

  • Handset antenna array to mitigate the finger loading effect

     Anguera Pros, Jaume; Cobo, Yolanda; Andújar Linares, Aurora; Picher, Cristina; Puente Baliarda, Carles
    European Conference on Antennas and Propagation
    Presentation's date: 2011-04-12
    Presentation of work at congresses

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    The effect of the human hand over the electromagnetic behavior of handset antennas is an important aspect that should be taken into account. In this r egard, the finger loading is a critical issue since it may det une the input impedance as well as decrease the efficiency. To ov ercome such effects, an array of several small handset antennas is proposed, in particular, an array of two elements and other with three elements distributed along the ground plane of a ha ndset wireless device. The finger loading effect over several posi tions is experimentally analyzed using a phantom hand in the 824- 960MHz frequency region where several communication s standards are allocated (e.g. GSM850 and GSM900). T he experiments reveal that the array with three elemen ts presents higher robustness to the finger loading effect fulf illing, at the same time, the size constraints imposed by handset platforms.

  • Reuse of the mobile communication antenna for FM reception

     Picher, Cristina; Anguera Pros, Jaume; Borja, C.; Andújar Linares, Aurora; Puente Baliarda, Carles; Kahng, Sungtek
    European Conference on Antennas and Propagation
    Presentation's date: 2011-05-12
    Presentation of work at congresses

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    A conventional monopole antenna (¿/4) operating at FM frequencies is too long for being integrated in a mobile phone. In order to avoid big external antennas or using the wire of the headsets, a new solution is proposed. It consists in reusing an existing mobile phone antenna usually operating at the communication standards (ex: GSM, CDMA, UMTS) with the aim of achieving operation also at FM band. Impedance, received power and audio quality measurements have been carried out demonstrating that a mobile handset antenna operating at GSM 900/1800 also allows users to listen to FM satisfactorily.

    A conventional monopole antenna (λ/4) operating a t FM frequencies is too long for being integrated in a mobile phone. In order to avoid big external antennas or u sing the wire of the headsets, a new solution is proposed. It con sists in reusing an existing mobile phone antenna usually operating at the communication standards (ex: GSM, CDMA, UMTS) with the aim of achieving operation also at FM band. Impedan ce, received power and audio quality measurements have been carr ied out demonstrating that a mobile handset antenna operati ng at GSM 900/1800 also allows users to listen to FM satisfac torily.

  • Multilevel and space-filling ground-planes for miniature and multiband antennas

     Puente Baliarda, Carles; Quintero Illera, Ramiro
    Date of request: 2011-01-31
    Invention patent

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  • Antenna structure for a wireless device with a ground plane shaped as a loop

     Puente Baliarda, Carles; Soler Castany, Jordi
    Date of request: 2011-10-27
    Invention patent

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  • Slotted ground plane used as a slot antenna or used for a pifa antenna

     Anguera Pros, Jaume; Puente Baliarda, Carles
    Date of request: 2011-03-24
    Invention patent

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  • Space-filling miniature antennas

     Puente Baliarda, Carles; Anguera Pros, Jaume; Rozan, Edouard
    Date of request: 2011-02-03
    Invention patent

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  • Loaded antenna

     Puente Baliarda, Carles; Soler, Jordi
    Date of request: 2011-03-14
    Invention patent

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  • Antenna with one or more holes (Multihole antenna)

     Puente Baliarda, Carles; Soler Castany, Jordi
    Date of request: 2011-01-28
    Invention patent

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  • Multiband antenna for handheld terminal

     Gala, David; Puente Baliarda, Carles; Soler Castany, Jordi
    Date of request: 2011-06-24
    Invention patent

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  • Handheld device with two antennas and method of enhancing the isolation between the antennas

     Mumbru, Josep; Anguera Pros, Jaume; Soler, Jordi; Puente Baliarda, Carles
    Date of request: 2011-12-30
    Invention patent

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  • Shaped ground plane for radio apparatus

     Anguera Pros, Jaume; Puente Baliarda, Carles
    Date of request: 2011-10-03
    Invention patent

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  • Multiband monopole antenna for a mobile communications device

     Sanz, Alfonso; Puente Baliarda, Carles
    Date of request: 2011-11-21
    Invention patent

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  • Metallized foams for antenna design: Application to fractal-shaped sierpinski-carpet monopole

     Anguera Pros, Jaume; Daniel, J.-P.; Borja, C.; Mumbru, Josep; Puente Baliarda, Carles; Leduc, T.; Sayegrih, K.; Van Roy, P
    Progress in electromagnetics research (PIER)
    Date of publication: 2010
    Journal article

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    Multiband handset antenna with a parallel excitation of PIFA and slot radiators  Open access

     Anguera Pros, Jaume; Sanz, Ivan; Mumbru, Josep; Puente Baliarda, Carles
    IEEE transactions on antennas and propagation
    Date of publication: 2010-02
    Journal article

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    A handset antenna technique combining a parallel excitation of a PIFA and a slot is presented. The number of frequency bands is given by the sum of bands given per each radiator which can be controlled independently. Component interaction (battery, display, and speaker) is analyzed to determine the best place to mitigate performance degradation. Finally, a concept featuring a small footprint (39 11 mm ) and low profile (2 mm) is proposed for multiband operation.A handset antenna technique combining a parallel excitation of a PIFA and a slot is presented. The number of frequency bands is given by the sum of bands given per each radiator which can be controlled independently. Component interaction (battery, display, and speaker) is analyzed to determine the best place to mitigate performance degradation. Finally, a concept featuring a small footprint (39 11 mm ) and low profile (2 mm) is proposed for multiband operation.

  • How much can be reduced the internal FM antenna of mobiles phones?

     Borja, C.; Anguera Pros, Jaume; Puente Baliarda, Carles; Vergés, Jordi
    European Conference on Antennas and Propagation
    Presentation's date: 2010
    Presentation of work at congresses

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    The paper introduces both a new internal FM antenna for mobile phones based on the fractal Hilbert curve, and a new evaluation criterion for quantifying the quality of the signal received by the FM antenna of mobile phones. The main attribute of the new internal FM antenna is its reduced size; which is only 30¿10¿1 mm3. The measurements demonstrate that the power received by the internal FM antenna is 20 dB lower than the power received by the external wire antenna under the same measurement conditions. Despite the reduction of the power level, the evaluation criterion reveals that, owing to the threshold effect in FM receivers, the signal quality indicator is similar for both antennas. Additionally, the value of the signal quality indicator achieved by both antennas guarantees to listen to the FM radio channels clearly without noise nuisance and without interferences.

  • A systematic method to design broadband matching networks

     Andújar Linares, Aurora; Anguera Pros, Jaume; Puente Baliarda, Carles
    European Conference on Antennas and Propagation
    Presentation's date: 2010
    Presentation of work at congresses

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    The narrow bandwidth (BW) associated to small antennas featured by a high quality factor (Q) can be enhanced by the addition of a matching network. However, the impedance matching is a difficult and time-consuming process since it depends on the ability of the designer for selecting that suitable matching architecture that achieves the best trade-off between BW, complexity and implementation. In this paper, a systematic method for broadening the BW of handset antennas is proposed. The method is focused on those antennas whose input impedance near the first resonance can be modeled as an RLC series circuit. In order to develop the proposal, a mathematical analysis is carried out using a simple electrical model and the theoretical results are validated through simulations and by an experimental process. As a result, a systematic method for designing matching networks with a good balance between complexity and BW enhancement is obtained. Thus, the method described herein ensures one half of Fano's limit BW increment through a simple and methodic matching design.

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    Analysis of the specific absorption rate in handset antennas with slotted ground planes  Open access

     Picher, Cristina; Anguera Pros, Jaume; Puente Baliarda, Carles; Kahng, Sungtek; Andújar Linares, Aurora
    European Conference on Antennas and Propagation
    Presentation's date: 2010-04
    Presentation of work at congresses

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    The study of the interaction between human head and handset antennas should be taken into account since all the mobile phones have to guarantee a biological compatibility. This research analyzes several antennas with different slotted ground planes in terms of free space and also in terms of human head interaction. The main objective is to compare the measured bandwidth and efficiency in free space and the impact on measured SAR (Specific Absorption Rate) of such antennas as a function of the slot configuration and the antenna/slot location. Results show that slots may be useful to increase bandwidth and efficiency while keeping a similar SAR compared to the non-slotted ground plane. Changing the antenna and the slot location is a good way to achieve a significant SAR reduction.

    The study of the interaction between human head and handset antennas should be taken into account since all the mobile phones have to guarantee a biological compatibility. This research analyzes several antennas with different slotted ground planes in terms of free space and also in terms of human head interaction. The main objective is to compare the measured bandwidth and efficiency in free space and the impact on measured SAR (Specific Absorption Rate) of such antennas as a function of the slot configuration and the antenna/slot location. Results show that slots may be useful to increase bandwidth and efficiency while keeping a similar SAR compared to the non-slotted ground plane. Changing the antenna and the slot location is a good way to achieve a significant SAR reduction.

  • Mitigation of the finger loading effect in handset antennas

     Anguera Pros, Jaume; Camps, Albert; Andújar Linares, Aurora; Puente Baliarda, Carles; Picher, Cristina
    European Conference on Antennas and Propagation
    Presentation's date: 2010-04
    Presentation of work at congresses

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    The effect of the human body over the radiation of handset antennas is a critical issue that have to be considered to ensure a good handset antenna performance. Among the human body effect, the finger is of particular interest since it is usually placed over the antenna area which may cause detuning and/or reduction of the efficiency. To mitigate the finger loading effects, a novel handset antenna consisting of two small antennas distributed along the ground plane is proposed. The distributed antenna system is compared with a single antenna having a broadband matching network, so both designs feature enough bandwidth to cover the GSM850 (824-890MHz) and GSM900 (880-960MHz) communication systems. The finger effect is analyzed in terms of efficiency using a phantom hand. Efficiency is measured for different finger locations concluding that the distributed antenna system is more robust to the finger loading effect.

    The effect of the human body over the radiation of handset antennas is a critical issue that have to be considered to ensure a good handset antenna performance. Among the human body effect, the finger is of particular interest since it is usually placed over the antenna area which may cause detuning and/or reduction of the efficiency. To mitigate the finger loading effects, a novel handset antenna consisting of two small antennas distributed along the ground plane is proposed. The distributed antenna system is compared with a single antenna having a broadband matching network, so both designs feature enough bandwidth to cover the GSM850 (824-890MHz) and GSM900 (880-960MHz) communication systems. The finger effect is analyzed in terms of efficiency using a phantom hand. Efficiency is measured for different finger locations concluding that the distributed antenna system is more robust to the finger loading effect.

  • The Hilbert monopole revisited

     Sanz, Ivan; Anguera Pros, Jaume; Andújar Linares, Aurora; Puente Baliarda, Carles; Borja, C.
    European Conference on Antennas and Propagation
    Presentation's date: 2010-04
    Presentation of work at congresses

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    A comparison between the resonant performance of the third iteration Hilbert monopole and a spiral shaped one of the same size and resonant frequency is presented. Quality factor, bandwidth, efficiency and radiation patterns are investigated. Although the Hilbert monopole total wire length is longer, it shows nearly the same radiation efficiency yet a lower quality factor. Hence the higher compression efficiency of the spiral shaped monopole does not provide any advantage in the antenna electromagnetic performance. Differences in radiation pattern are also observed. It is demonstrated that antenna resonance performance depends on its geometry, and not only on its size or wire length.

  • Tecnología Antennaless para la futura generación de teléfonos móviles sin antena

     Puente Baliarda, Carles; Anguera Pros, Jaume
    Participation in a competitive project

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  • COUPLED MONOPOLE ANTENNA DESIGN FOR MULTIBAND HANDSET DEVICES

     Risco, S.; Anguera Pros, Jaume; Perez, A; Andújar Linares, Aurora; Puente Baliarda, Carles
    Microwave and optical technology letters
    Date of publication: 2010-02
    Journal article

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  • Enhacing robustness of handset antennas to finger loading effects

     Anguera Pros, Jaume; Camps, Albert; Puente Baliarda, Carles; Andújar Linares, Aurora
    Electronics Letters
    Date of publication: 2009-07-17
    Journal article

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    A novel handset antenna consisting of two small antennas is proposed to mitigate finger loading effects. Both antennas are excited with a different phase in order to maximise the bandwidth. A phantom hand has been used to perform the experiments. It demonstrates how the finger affects the radiation behaviour for three particular positions of the finger over the antenna area. Experimental results feature a wider input impedance bandwidth and a higher degree of immunity to finger loading effects when compared with a single-element approach.

  • Multi-band handset antenna combining a PIFA, solts, and ground plane modes

     Cabedo, Arnau; Anguera Pros, Jaume; Picher, Cristina; Ribó, Miquel; Puente Baliarda, Carles
    IEEE transactions on antennas and propagation
    Date of publication: 2009
    Journal article

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    A multiband handset antenna combining a PIFA and multiple slots on a ground plane is presented. It is shown by means of simulations that the slots on the ground plane have a double function: to tune the ground plane resonance at low frequencies (f ?? 900 MHz) and to act as parasitic radiators at high frequencies (f ?? 1800 MHz). A prototype is designed and built featuring a behavior suitable for low frequencies (GSM850 and GSM900) and for high frequencies spanning from DCS1800 to Bluetooth, and including, for instance, PCS1900, UMTS2000, and other possible systems. Reflection coefficient, efficiency, and radiation patterns are measured and compared with a design without slots to prove the advantages of the slotted ground plane. The component effect is investigated to determine critical areas where the placement is not recommended. Besides, the effect of the slot of the ground plane on SAR is investigated, by discussing the effect of the ground plane and slot modes for two phone positions. The total antenna volume of the proposed design is 40 ?? 15 ?? 6 mm3.

  • Multiband handset antenna using slots on the ground plane: considerations to facilitate the integration of the feeding transmission line

     Anguera Pros, Jaume; Cabedo, Arnau; Picher, Cristina; Puente Baliarda, Carles; Kahng, Sungtek
    Progress in electromagnetics research C
    Date of publication: 2009
    Journal article

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  • Analysis of the human body on the radiation of FM handset antenna

     Vergés, J.; Anguera Pros, Jaume; Puente Baliarda, Carles; Aguilar, David
    Microwave and optical technology letters
    Date of publication: 2009
    Journal article

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    A simple human body phantom model is proposed and used to demonstrate that the radiation efficiency of an internal handset antenna operating at the FM band can be improved for a particular holding position up to 10 dB. To corroborate the numerical results, an experiment using a real human body has been performed showing very good agreemen

  • Dual frequency broadband microstrip antenna with a reactive loading and stacked elements

     Anguera Pros, Jaume; Puente Baliarda, Carles; Borja, C.
    Progress in electromagnetics research letters
    Date of publication: 2009
    Journal article

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    A dual-band enhanced-bandwidth microstrip antenna is presented with a frequency separation of f2=f1 = 1:33. In order to achieve the dual-frequency operation, a rectangular patch is loaded with a stub at one of its radiating edges. To improve bandwidth at each band, two parasitic patches are coupled to the driven element.

  • On the radiation psttern of the L-shaped wire antenna

     Anguera Pros, Jaume; Andújar Linares, Aurora; Puente Baliarda, Carles; Pérez, A.
    Progress in electromagnetics research M (PIER M)
    Date of publication: 2009
    Journal article

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    An objective of the present study is to make a physical insight into the radiation properties of an L-shaped wire antenna. More specifically, the study is focused on the effects of the antenna geometry over the characteristic radiation pattern of an L-shaped wire antenna. Regarding the basic equations for the radiated field, three main regions according to the length-height ratio of an L-shaped wire antenna have been determined. The said regions depict the geometrical boundaries where the L-shaped wire antenna loses its characteristic monopoletype radiation pattern. In this sense and relating to the aspect ratio of the L-shaped antenna, the said radiation properties can be easily varied in order to achieve a half isotropic radiation pattern or even, a patch-type radiation pattern. Thus, the method described herein demonstrates that simple modifications applied to the geometry of a basic structure, allow obtaining radiation properties associated to more complex structures.

  • Antenas fractales microstrip impresas en esponjas metalizables

     Anguera Pros, Jaume; Daniel, Jean Pierre; Borja, C.; Mumbru, Josep; Puente Baliarda, Carles; Picher, Cristina; Leduc, Tiphanie; Van Roy, Peter
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation's date: 2009-09
    Presentation of work at congresses

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    Radiating elements are usually made of metallic materials which increase the antenna complexity and weight. In order to solve this drawback, an antenna manufacture process using metallized foams is presented. A microstrip patch antenna inspired in the fractal Koch island geometry embedded in a rectangular cavity is built and tested. Results of reflection coefficient and directivity versus frequency have been compared with simulated data resulting in very good agreement. All the metallic parts of the antenna (patch, cavity, and feeding probe) have been metallized on the foam resulting in a low weight, low complexity, and low cost antenna structure.

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    Conformación del diagrama de radiación de un monopolo en L  Open access

     Andújar Linares, Aurora; Anguera Pros, Jaume; Puente Baliarda, Carles; Picher, Cristina
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation's date: 2009-09
    Presentation of work at congresses

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    The typical radiation pattern of an L-monopole antenna can be easily modified by changing the geometrical characteristics of the structure. To shape a specific radiation pattern through a basic structure becomes an interesting freedom degree in order to better adapt the behaviour of the antenna to the design specifications. Thus, to solve the question, an accurate analysis following the radiated field basic equations has been carried out. The theoretical study is validated through a simulation and experimental process. The results depict three main regions, delimited by geometrical boundaries, where the Lshaped wire antenna present three specific radiation pattern types, a monopole-type, a half isotropic type or even, a patchtype radiation pattern. Consequently, the method described herein demonstrates that simple modifications applied to the geometry of a basic structure, allow obtaining radiation properties associated to more complex structures.

    The typical radiation pattern of an L-monopole antenna can be easily modified by changing the geometrical characteristics of the structure. To shape a specific radiation pattern through a basic structure becomes an interesting freedom degree in order to better adapt the behaviour of the antenna to the design specifications. Thus, to solve the question,an accurate analysis following the radiated field basic equations has been carried out. The theoretical study is validated through a simulation and experimental process. The results depict three main regions, delimited by geometrical boundaries, where the Lshaped wire antenna present three specific radiation pattern types, a monopole-type, a half isotropic type or even, a patchtype radiation pattern. Consequently, the method described herein demonstrates that simple modifications applied to the geometry of a basic structure, allow obtaining radiation properties associated to more complex structures.

  • Analysis of several antenna topologies operating at 2.4GHz band close to human head

     Anguera Pros, Jaume; Gonzalez, Laura; Andújar Linares, Aurora; Puente Baliarda, Carles
    IEEE International Symposium on Antennas and Propagation
    Presentation's date: 2009-06
    Presentation of work at congresses

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  • Comparing balanced and single-ended handset antennas in free space and human loading scenarios

     Anguera Pros, Jaume; Arenas, Juan José; Andújar Linares, Aurora; Puente Baliarda, Carles; Kahng, Sungtek
    IEEE International Symposium on Antennas and Propagation
    Presentation's date: 2009-06
    Presentation of work at congresses

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    Análisis del comportamiento de antenas móviles multibanda en presencia del cuerpo humano  Open access

     Risco, S.; Anguera Pros, Jaume; Andújar Linares, Aurora; Picher, Cristina; Puente Baliarda, Carles
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation's date: 2009-09
    Presentation of work at congresses

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    The great majority of wireless devices are used close to the human head. These changes the antenna performance compared to free space situation. The human head absorbs an amount of power from the antenna radiation. In this sense, it is important not only to increase the robustness of the antenna performance, but also to reduce the amount of power absorbed by the human head. A coupled monopole and a PIFA antenna are evaluated in terms of antenna performance in presence of the human head. The most significant parameters (SAR, efficiency and return losses) are obtained at two different positions of the antenna as a function of the frequency band, to finally evaluate the impact of the human head to the antenna performance, and the effect of the antenna on it. Despite both antennas have a similar efficiency value at Free Space, monopole antenna has more sensitivity to the interaction with the human head.

    The great majority of wireless devices are used close to the human head. These changes the antenna performance compared to free space situation. The human head absorbs an amount of power from the antenna radiation. In this sense, it is important not only to increase the robustness of the antenna performance, but also to reduce the amount of power absorbed by the human head. A coupled monopole and a PIFA antenna are evaluated in terms of antenna performance in presence of the human head. The most significant parameters (SAR, efficiency and return losses) are obtained at two different positions of the antenna as a function of the frequency band, to finally evaluate the impact of the human head to the antenna performance, and the effect of the antenna on it. Despite both antennas have a similar efficiency value at Free Space, monopole antenna has more sensitivity to the interaction with the human head.

  • Diseño de una antena multibanda con ranuras en el plano de masa: una técnica para facilitar la integración de la línea de alimentación

     Picher, Cristina; Anguera Pros, Jaume; Andújar Linares, Aurora; Puente Baliarda, Carles; Risco, Sergi; Kahng, Sungtek
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation's date: 2009
    Presentation of work at congresses

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    The integration of transmission lines is a difficult task due to the presence of slots. In order to facilitate the integration of the feeding transmission line which connects the antenna with the RF-module, this research proposes a ground plane modification using central slots. Numerical simulation using MoM is used to understand the effect of the slots on the ground plane and several prototypes have been built to validate the present technique. Through this technique is possible to obtain a multiband antenna while keeping the same antenna geometry, small volume and simplifying the PCB (Printed Circuit Board) design.

  • Sistema Distribuido de Antenas: hacia la miniaturización de antenas de dispositivos móviles robustos al cuerpo humano

     Anguera Pros, Jaume; Puente Baliarda, Carles
    Participation in a competitive project

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  • Recerca de noves antenes i sistemes miniaturitzats per a plataformes Wireless mòbils de nova generació

     Borja, C.; Puente Baliarda, Carles
    Participation in a competitive project

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