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  • Equivalent circuits of planar filtering antennas fed by apertures

     Kufa, Martin; Raida, Zbynek; Mateu Mateu, Jordi
    International Conference on Microwaves, Radar and Wireless Communications
    p. 1-4
    DOI: 10.1109/MIKON.2014.6899977
    Presentation's date: 2014-06-16
    Presentation of work at congresses

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    The paper is focused on a design of a three-element filtering patch antenna array using an equivalent-circuit approach. The array is requested to exhibit a prescribed frequency response of a realized gain which corresponds to the output signal of a band-pass filter. When implementing the antenna, no filter elements are allowed to be used. Such an antenna can become a good candidate for the design of filtering antennas (filtennas). We present an equivalent circuit of such an antenna array. The equivalent circuit is validated by a full-wave model of the antenna. The equivalent circuit is transformed to a low-pass prototype filter. The low-pass prototype filter is intended to be exploited for the synthesis of filtering antenna arrays.

  • Absorptive limiter for frequency-selective circuits

     Collado Gomez, Juan Carlos; Hueltes Escobar, Alberto; Rocas Cantenys, Eduard; Mateu Mateu, Jordi; Booth, James C.; O'callaghan Castella, Juan Manuel; Verdú Tirado, Jordi
    IEEE microwave and wireless components letters
    Vol. 24, num. 6, p. 415-417
    DOI: 10.1109/LMWC.2014.2313583
    Date of publication: 2014-06-01
    Journal article

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    This letter describes a novel absorptive limiter for frequency-selective circuits. The proposed circuit allows the design of absorptive limiters based on a bi-state phase shifter, which is appropriate for integration into channelizing devices, such as hybrid-coupled input multiplexers. A preliminary prototype with shunt PIN diodes has been fabricated and measured to demonstrate the viability of the concept.

  • Nonlinear performance of BAW filters including BST capacitors

     Rocas Cantenys, Eduard; Mateu Mateu, Jordi; Collado Gomez, Juan Carlos; Hueltes Escobar, Alberto; Verdu Tirado, Jorge Andres; Billard, Christophe; David, Jean Baptiste; Reinhardt, Alexandre
    Radioengineering
    Vol. 23, num. 1, p. 369-374
    Date of publication: 2014-04-01
    Journal article

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    This paper evaluates the nonlinear effects occurring in a bulk acoustic wave (BAW) filter which includes barium strontium titanate (BST) capacitors to cancel the electrostatic capacitance of the BAW resonators. To do that we consider the nonlinear effects on the BAW resonators by use of a nonlinear Mason model. This model accounts for the distributed nonlinearities inherent in the materials forming the resonator. The whole filter is then implemented by properly connecting the resonators in a balanced configuration. Additional BST capacitors are included in the filter topology. The nonlinear behavior of the BST capacitors is also accounted in the overall nonlinear assessment. The whole circuit is then used to evaluate its nonlinear behavior. It is found that the nonlinear contribution arising from the ferroelectric nature of the BST capacitors makes it impractical to fulfill the linearity requirements of commercial filters.

  • Access to the full text
    Filtenna integration achieving ideal chebyshev return losses  Open access

     Hueltes Escobar, Alberto; Verdu Tirado, Jorge Andres; Collado Gomez, Juan Carlos; Mateu Mateu, Jordi; Rocas Cantenys, Eduard; Valenzuela Gonzalez, Jose Luis
    Radioengineering
    Vol. 23, num. 1, p. 362-368
    Date of publication: 2014-04-01
    Journal article

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    This paper demonstrates that it is possible to find an ideal filter response (Chebyshev, Butterworth,..) considering the antenna as the last resonator of a filter under certain circumstances related with the antenna performance and the bandwidth of the filtenna device. If these circumstances are not accomplished, we can achieve excellent performance as well, by means of an iterative process the goal of which is defined by either a filter mask or a classical filter function itself. The methodology is based on the conventional coupling matrix technique for filter design and has been validated by fabricating a microstrip prototype using hairpin resonators and a rectangular patch antenna.

  • Components and Systems for Comnunications Research Group

     Mateu Mateu, Jordi; Montoro López, Gabriel; Gilabert Pinal, Pere Lluis; Bertran Alberti, Eduardo; Berenguer Sau, Jordi; González Arbesú, José María; Rocas Cantenys, Eduard; Verdu Tirado, Jorge Andres; Hueltes Escobar, Alberto; Gelonch Bosch, Antoni; Collado Gomez, Juan Carlos
    Competitive project

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  • Electro-thermo-mechanical model for bulk acoustic wave resonators

     Rocas Cantenys, Eduard; Collado Gomez, Juan Carlos; Mateu Mateu, Jordi; Orloff, Nathan D.; Booth, James C.; Aigner, Robert
    IEEE transactions on Ultrasonics Ferroelectrics and Frequency control
    Vol. 60, num. 11, p. 2389-2403
    DOI: 10.1109/TUFFC.2013.6644742
    Date of publication: 2013-11
    Journal article

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    We present the electro-thermo-mechanical constitutive relations, expanded up to the third order, for a BAW resonator. The relations obtained are implemented into a circuit model, which is validated with extensive linear and nonlinear measurements. The mathematical analysis, along with the modeling, allows us to identify the dominant terms, which are the material temperature derivatives and two intrinsic nonlinear terms, and explain, for the first time, all observable effects in a BAW resonator by use of a unified physical description. Moreover, the terms that are responsible for the second-harmonic generation and the frequency shift with dc voltage are shown to be the same.

  • Performance of BAW resonators at cryogenic temperatures

     Rocas Cantenys, Eduard; Collado Gomez, Juan Carlos; Mateu Mateu, Jordi; Hueltes Escobar, Alberto; Verdú Tirado, Jordi; Booth, James C.; Aigner, Robert
    IEEE International Ultrasonics Symposium
    p. 1672-1675
    DOI: 10.1109/ULTSYM.2013.0426
    Presentation's date: 2013-07
    Presentation of work at congresses

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    In this work we go beyond the usual temperature range for commercial applications and explore the functioning of Bulk Acoustic Wave (BAW) resonators down to cryogenic temperatures, to get the whole picture at understanding the physical tendency of the main parameters with temperature. This can ensure the proper functioning for specific applications where the device is exposed to extreme temperature variations.

  • Dispositivos pasivos avanzados para cabezales multibanda, multimodo

     Rocas Cantenys, Eduard; Mateu Mateu, Jordi; Heldring, Alexander; González Arbesú, José María; Collado Gomez, Juan Carlos; Ubeda Farre, Eduardo
    Competitive project

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  • A consistent methodology to characterize BAW resonators

     Rocas Cantenys, Eduard; Collado Gomez, Juan Carlos; Aigner, Robert; Mateu Mateu, Jordi; Hueltes Escobar, Alberto; Booth, James C.
    IEEE International Ultrasonics Symposium
    p. 547-550
    DOI: 10.1109/ULTSYM.2012.0136
    Presentation's date: 2012-10
    Presentation of work at congresses

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    We present a methodology to characterize BAW resonators both linearly and nonlinearly. The procedure uses physical modeling along with measurements that exploit different manifestations of the nonlinear phenomena to identify the dominant linear and nonlinear material properties. Such methodology allows obtaining consistent nonlinear material parameters by use of two independents measurements.

    We present a methodology to characterize BAW resonators both linearly and nonlinearly. The procedure uses physical modeling along with measurements that exploit different manifestations of the nonlinear phenomena to identify the dominant linear and nonlinear material properties. Such methodology allows obtaining consistent nonlinear material parameters by use of two independents measurements.

  • Óxidos y estructuras híbridas de respuesta multifuncional

     O'callaghan Castella, Juan Manuel; Mateu Mateu, Jordi
    Competitive project

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  • A Large-Signal Model of Ferroelectric Thin-Film Transmission Lines

     Rocas Cantenys, Eduard; Collado Gomez, Juan Carlos; Mateu Mateu, Jordi; Orloff, Nathan D.; O'callaghan Castella, Juan Manuel; Booth, James C.
    IEEE transactions on microwave theory and techniques
    Vol. 59, num. 12, p. 3059-3067
    DOI: 10.1109/TMTT.2011.2169420
    Date of publication: 2011-12
    Journal article

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  • WSN4QoL (Secure Location-Aware Cooperative Network-Coded WSNs for better Quality of Life)

     Mateu Mateu, Jordi; Alonso Zárate, Luis Gonzaga
    Competitive project

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  • Design and synthesis of a new class of receiver filters

     Mateu Mateu, Jordi; Collado Gomez, Juan Carlos; Padilla Díaz, Alberto; Rius Casals, Juan-manuel; O'callaghan Castella, Juan Manuel; Cuñado, O; Torra, J; Mingot, S; Ernst, Cristoph
    ESA Techno/Innovation Days
    p. 22-23
    Presentation's date: 2011-11-23
    Presentation of work at congresses

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  • Design of a high temperature superconductor suto-limiting multiplexer for interference mitigation

     Booth, James C.; Rocas Cantenys, Eduard; Padilla Díaz, Alberto; Collado Gomez, Juan Carlos; Mateu Mateu, Jordi; Berkowitz, Stuart
    European Conference on Applied Superconductivity
    p. 1
    Presentation's date: 2011-09-19
    Presentation of work at congresses

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  • Thermal and intrinsic nonlinearities of ferroelectric-based microwave devices

     Rocas Cantenys, Eduard; Collado Gomez, Juan Carlos; Mateu Mateu, Jordi; Booth, James C.
    International Symposium of Integrated Functionalities
    p. 150
    Presentation's date: 2011-08-03
    Presentation of work at congresses

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  • ultra-wideband Communications Based on Impulse Radio: Towards a Practical Implementation

     Antonio Mollfulleda San Julian
    Castelldefels School of Telecommunications and Aerospace Engineering (EETAC)
    Theses

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    The theory Impulse Radio (IR) was developed in the 1960¿s but has been relegated to a few imaging or radar applications in favor of the communication systems whose carrier is a sinusoidal signal. The situation started to change in 2002 when the Federal Communications Commission (FCC) released a regulation that allowed unlicensed radio transmission in the band raging from 3:1GHz to 10:6GHz. This raised the interest on IR as a candidate to implement a radio communication system with extremely large bandwidth. In this thesis, several well known signaling and receiver architectures for IR are reviewed from a theoretical point of view. Stored Reference receiver, Transmitted Reference receiver, RAKE receiver, and Energy Detector are evaluated in a practical environment where the channel impulse response expands over hundreds of multipath components. It is shown that none of these receivers performs close to the optimum matched filter bound.

  • Substrate integrated waveguide predistorted filter at 20 GHz

     Mira, Fermín; Mateu Mateu, Jordi; Bozzi, M.
    IET microwaves antennas and propagation
    Vol. 5, num. 8, p. 928-933
    DOI: 10.1049/iet-map.2010.0369
    Date of publication: 2011-06-06
    Journal article

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  • Superconducting Multiplexer Filter Bank for a Frequency-Selective Power Limiter

     Padilla Díaz, Alberto; Mateu Mateu, Jordi; Orloff, Nathan D.; O'callaghan Castella, Juan Manuel; Collado Gomez, Juan Carlos; Booth, James C.; Rocas Cantenys, Eduard
    IEEE transactions on applied superconductivity
    Vol. 21, num. 3, p. 542-546
    DOI: 10.1109/TASC.2010.2093554
    Date of publication: 2011-06
    Journal article

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  • Modeling of self-heating mechanism in the design of superconducting limiters

     Collado Gomez, Juan Carlos; Mateu Mateu, Jordi; Orloff, Nathan D.; Booth, James C.; Rocas Cantenys, Eduard
    IEEE transactions on applied superconductivity
    Vol. 21, num. 3, p. 547-550
    DOI: 10.1109/TASC.2010.2090449
    Date of publication: 2011-06
    Journal article

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  • First-order elastic nonlinearities of bulk acoustic wave resonators

     Collado Gomez, Juan Carlos; Padilla Díaz, Alberto; Mateu Mateu, Jordi; O'callaghan Castella, Juan Manuel; Orloff, Nathan D.; Booth, James C.; Iborra, Enrique; Aigner, Robert; Rocas Cantenys, Eduard
    IEEE transactions on microwave theory and techniques
    Vol. 59, num. 5, p. 1206-1213
    DOI: 10.1109/TMTT.2010.2098042
    Date of publication: 2011-05
    Journal article

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  • Agile RF transceivers and front-ends for future smart multi-standar communications applications-upc

     Mateu Mateu, Jordi; Collado Gomez, Juan Carlos
    Competitive project

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    Passive intermodulation due to self-heating in printed transmission lines  Open access

     Collado Gomez, Juan Carlos; Orloff, Nathan D.; Mateu Mateu, Jordi; Padilla Díaz, Alberto; O'callaghan Castella, Juan Manuel; Booth, James C.; Rocas Cantenys, Eduard
    IEEE transactions on microwave theory and techniques
    Vol. 59, num. 2, p. 311-322
    DOI: 10.1109/TMTT.2010.2090356
    Date of publication: 2011
    Journal article

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  • Connecteu-aerospace.cat

     Collado Gomez, Juan Carlos; Prats Menéndez, Xavier; Berenguer Sau, Jordi; de Villardi de Montlaur, Adeline; Mateu Mateu, Jordi
    Competitive project

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  • A Compact Variable-Temperature Broadband Series-Resistor Calibration

     Orloff, Nathan D.; Mateu Mateu, Jordi; Lewandowski, A.; King, Joshua P.; Gu, Dazhen; Lu, X.L.; Collado Gomez, Juan Carlos; Takeuchi, Ichiro; Booth, James C.; Rocas Cantenys, Eduard
    IEEE transactions on microwave theory and techniques
    Vol. 59, num. 1, p. 188-195
    DOI: 10.1109/TMTT.2010.2091200
    Date of publication: 2010-12-10
    Journal article

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    Passive devices for UWB systems  Open access

     Mira, Fermín; Mollfulleda, Antonio; Miskovsky, Pavel; Mateu Mateu, Jordi; González Arbesú, José María
    DOI: 10.5772/10008
    Date of publication: 2010-09
    Book chapter

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  • Supercoducting multiplexer filter bank for a frequency selective power limiter

     Mateu Mateu, Jordi; Padilla Díaz, Alberto; O'callaghan Castella, Juan Manuel; Collado Gomez, Juan Carlos; Rocas Cantenys, Eduard
    Applied Superconductivity Conference
    Presentation's date: 2010-08
    Presentation of work at congresses

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  • Quantitative permittivity measurements of nanoliter fluid volumes from 50 MHz to 40 GHz with microfluidic channels

     Booth, James C.; Orloff, Nathan D.; Rocas Cantenys, Eduard; Mateu Mateu, Jordi; Collado Gomez, Juan Carlos; Lu, X.L.; Wang, Y.; Janezic, M.
    Conference on Precision Electromagnetic Measurements (CPEM)
    p. 353-354
    Presentation's date: 2010-06
    Presentation of work at congresses

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  • Application of lossy filter synthesis to a C-band cavity filter and its prospect for use in IMUX

     O'callaghan Castella, Juan Manuel; Padilla Díaz, Alberto; Mateu Mateu, Jordi; Rius Casals, Juan-manuel; Tamayo Palau, Jose Maria; Collado Gomez, Juan Carlos; Rocas Cantenys, Eduard
    Microwave Technology and Techniques Workshop
    Presentation's date: 2010-05-12
    Presentation of work at congresses

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  • Lossy filter synthesis of L-band planar filters using novel software

     Padilla Díaz, Alberto; Mateu Mateu, Jordi; Collado Gomez, Juan Carlos; Ernst, Cristoph; Rius Casals, Juan-manuel; Tamayo Palau, Jose Maria; O'callaghan Castella, Juan Manuel; Rocas Cantenys, Eduard
    Microwave Technology and Techniques Workshop
    p. 1
    Presentation's date: 2010-05-12
    Presentation of work at congresses

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    Lossy synthesis techniques are used to synthesize high performance filters using resonators with a finite Q. With these techniques a transmission response of a lossless filter with lowest possible roll-off is obtained, except for an overall constant additional insertion loss. The out-of band performance is not affected. These types of filters are useful in receiver architectures where the filter can be placed following an amplifying stage and some increase in insertion loss can be tolerated without affecting the noise figure. Due to the lower resonator Q that can be employed, low cost and compact filters (such as microstrip filters) can be realized. Hence this work presents the synthesis and design of two planar lossy filters. Both filters have been designed using microstrip technology, with center frequencies of 1 GHz and 1.6 GHz, and bandwidth of 36 MHz and 80 MHz, respectively. Both filters exhibit a flat in-band response with an insertion loss of 10 dB and 7.5 dB, respectively. The topologies obtained from the synthesis result in a 4th and a 6th order filters at 1 GHz and 1.6 GHz, respectively. Both topologies present a uniform Q distribution throughout the networks, this is all the resonators of the filter are equal to 200 and 290, respectively. In contrast with conventional filter networks, where all the couplings are reactive, lossy filters require some of the couplings to be resistive. The main difference between the two filters presented is the type of frequency response. While the filter at 1 GHz synthesizes a response with a stopband 10 dB return loss, the filter at 1.6 GHz synthesizes a purely reflective response in the stopband. The presentation will also show details of the software package that has been written to synthesize filters following various forms of pre-distortion, classical (no-loss considered in the synthesis) and lossy filter synthesis. This software obtains the coupling matrix of several network topologies for a given response and allows performing rotations on them to find the desired topology. Additionally, the software allows to evaluate the effect of loss in the networks resulting from the synthesis, even in those cases where the synthesis results in an ideal lossless network (i.e., classical and pre-distortion synthesis).

  • Quantitative Permittivity Measurements of Nanoliter Liquid Volumes in Microfluidic Channels to 40 GHz

     Booth, James C.; Orloff, Nathan D.; Mateu Mateu, Jordi; Janezic, M.; Rinehart, M.; Beall, J. A.
    IEEE transactions on instrumentation and measurement
    Vol. 59, num. 12, p. 3279-3288
    DOI: 10.1109/TIM.2010.2047141
    Date of publication: 2010-05-10
    Journal article

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    Comparison of lossy filters and predistorted filters using novel software  Open access

     Padilla Díaz, Alberto; Mateu Mateu, Jordi; Collado Gomez, Juan Carlos; Ernst, Cristoph; Rius Casals, Juan-manuel; Tamayo Palau, Jose Maria; O'callaghan Castella, Juan Manuel
    IEEE International Microwave Symposium
    p. 1720-1723
    Presentation's date: 2010-05
    Presentation of work at congresses

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    Synthesis of 4th order lossy filters with uniform Q distribution  Open access

     Mateu Mateu, Jordi; Padilla Díaz, Alberto; Collado Gomez, Juan Carlos; Martínez-Mendoza, Mónica; Ernst, Cristoph; O'callaghan Castella, Juan Manuel; Rocas Cantenys, Eduard
    IEEE International Microwave Symposium
    p. 568-571
    Presentation's date: 2010-05
    Presentation of work at congresses

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  • TECNOLOGIA Y NUEVAS TECNICAS DE DISEÑO PARA INTEGRACION EN CHIP DE CABECERAS DE MICROONDAS

     Mateu Mateu, Jordi; Ubeda Farre, Eduardo; González Arbesú, José María; Heldring, Alexander; Collado Gomez, Juan Carlos
    Competitive project

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  • Agile RF Transceivers and Front-Ends for future Smart Muli-Standard Communications Applications

     Collado Gomez, Juan Carlos; Mateu Mateu, Jordi
    Competitive project

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    Nonlinear distributed model for bulk acoustic wave resonators  Open access

     Collado Gomez, Juan Carlos; Mateu Mateu, Jordi; Padilla Díaz, Alberto; O'callaghan Castella, Juan Manuel; Rocas Cantenys, Eduard
    IEEE transactions on microwave theory and techniques
    Vol. 57, num. 12, p. 3019-3029
    DOI: 10.1109/TMTT.2009.2034211
    Date of publication: 2009-12
    Journal article

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    This work expands the model proposed by Krimtholz, Leedom, and Matthaei (KLM) model to account for the nonlinear effects occurring in acoustic devices due to the nonlinear stiffened elasticity.We show that a nonlinear distributed capacitance in the acoustic transmission line of the KLM model can account for the distributed nature of the nonlinear effects. Specifically, we use the nonlinear telegrapher’s equation to find closed-form equations for intermodulation distortion and harmonic generation. We confirm the validity of these equations by comparing their results with those provided by aKLMequivalent circuit in which the nonlinear transmission line is implemented by cascading many L-C cells having a voltage-dependent capacitance. To further confirm the model, we show measured nonlinear effects in a thin film bulk acoustic resonator in close agreement with the equivalent circuit simulations.

  • Superconducting filters and passive components

     Collado Gomez, Juan Carlos; Mateu Mateu, Jordi; O'callaghan Castella, Juan Manuel; Mareu, J
    Date of publication: 2009-08-31
    Book chapter

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  • Dispositivo y filtro de onda acústica

     Collado Gomez, Juan Carlos; Mateu Mateu, Jordi; O'callaghan Castella, Juan Manuel; Padilla Díaz, Alberto; Rocas Cantenys, Eduard
    Date of request: 2009-07-08
    Invention patent

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    Dispositivo y filtro de onda acústica.

    El dispositivo comprende dos o más electrodos (1, 2), una capa activa piezoeléctrica (3) y unos medios de compensación de señales que comprenden como mínimo una capa compensatoria dieléctrica (4) configurada y ubicada para compensan señales espurias generadas, al aplicar una señal de entrada a dichos electrodos (1, 2), por unas no linealidades intrínsecas sustancialmente independientes de la temperatura, inherentes a las propiedades de elasticidad no lineales del material de al menos dicha capa activa (3).

    Para un ejemplo de realización los medios de compensación comprenden una fuente de tensión continua (Vdc) en conexión eléctrica con unas capas de alta conductividad (1, 2) entre las que se encuentra la capa compensatoria dieléctrica (4), para aplicar una tensión continua que varíe sus propiedades de elasticidad no lineales.

    El filtro comprende uno o más dispositivos como el propuesto por la invención.

  • Measurement of the Microwave Nonlinear Response of Combined Ferroelectric-Superconductor Transmission Lines

     Booth, James C.; Orloff, Nd; Mateu Mateu, Jordi
    IEEE transactions on applied superconductivity
    Vol. 19, num. 3, p. 940-943
    Date of publication: 2009-06
    Journal article

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  • Design of Ultra-Wideband Substrate Integrated Waveguide (SIW) Filters in Zigzag Topology

     Mira, F; Mateu Mateu, Jordi; Cogollos, S; Boria, Ve
    IEEE microwave and wireless components letters
    Vol. 19, num. 5, p. 281-283
    Date of publication: 2009-05
    Journal article

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  • MEDIDAS DE EFECTOS DE SINTONIZABILIDAD EN MATERIALES MULTIFERROICOS

     Mateu Mateu, Jordi; Collado Gomez, Juan Carlos; O'callaghan Castella, Juan Manuel
    Competitive project

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  • Third-order intermodulation distortion and harmonic generation in mismatched weakly nonlinear transmission lines

     Mateu Mateu, Jordi; Collado Gomez, Juan Carlos; Orloff, N; Booth, James C.; Rocas, E; O'callaghan Castella, Juan Manuel
    IEEE transactions on microwave theory and techniques
    Vol. 57, num. 1, p. 10-18
    Date of publication: 2009-01
    Journal article

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  • Broadband dielectric spectroscopy of Ruddlesden-Popper Srn+1TinO3n+1 (n=1,2,3) thin films

     Orloff, Nd; Tian, W; Fennie, Cj; Lee, Ch; Gu, D; Mateu Mateu, Jordi
    Applied physics letters
    Vol. 94, num. 042908, p. 1
    Date of publication: 2009-01
    Journal article

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  • Nonlinear distributed model for IMD prediction in BAW resonators

     Rocas, E; Collado Gomez, Juan Carlos; Padilla, A; Mateu Mateu, Jordi; O'callaghan Castella, Juan Manuel
    2008 IEEE International Ultrasonics Symposium
    p. 1557-1560
    Presentation of work at congresses

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  • Third order Intermodulation distortion in film bulk acoustic resonator at resonance and antiresonance

     Rocas, E; Collado Gomez, Juan Carlos; Mateu Mateu, Jordi; Campanella, H; O'callaghan Castella, Juan Manuel
    IEEE International Microwave Symposium
    p. 1259-1262
    Presentation of work at congresses

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  • A Cavity measurement setup for determining IMD properties of top and bottom sides of HTS films

     Diaz, R; Mateu Mateu, Jordi; Collado Gomez, Juan Carlos; O'callaghan Castella, Juan Manuel
    2008 IEEE Applied Superconductivity Conference
    p. 66
    Presentation of work at congresses

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  • Wideband nonlinear response of high-temperature superconducting thin films from transmission-line measurements

     Mateu Mateu, Jordi; Booth, James C.; Moeckly, B H
    IEEE transactions on microwave theory and techniques
    Vol. 55, num. 7, p. 1425-1430
    Date of publication: 2007-07
    Journal article

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  • Nonlinear response of combined superconductor/ferroelectric devices:first experimental step

     Mateu Mateu, Jordi; Booth, James C.; Moeckly, B
    IEEE transactions on applied superconductivity
    Vol. 17, num. 2, p. 942-945
    Date of publication: 2007-06
    Journal article

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  • Modeling superconducting transmission line bends and their impact on nonlinear effects

     Mateu Mateu, Jordi; Collado Gomez, Juan Carlos; O'callaghan Castella, Juan Manuel
    IEEE transactions on microwave theory and techniques
    Vol. 55, num. 5, p. 822-828
    Date of publication: 2007-05
    Journal article

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    Miniaturization of superconducting filters using Hilbert fractal curves  Open access

     Barra, Mario; Collado Gomez, Juan Carlos; Mateu Mateu, Jordi; O'callaghan Castella, Juan Manuel
    IEEE transactions on applied superconductivity
    Vol. 15, num. 3, p. 3841-3846
    Date of publication: 2007-05
    Journal article

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    This work presents novel compact high-temperature superconductor microstrip resonators and filters based on the Hilbert space-filling fractal curve. Several Hilbert resonator configurations have been assessed by using a full-wave electromagnetic simulator and their miniaturization performance has been investigated, emphasizing the parameters which allow obtaining good tradeoff between compact size and losses. These resonators have proved to be useful for filter design. A four-pole 2.45-GHz quasi-elliptic filter and a four-pole 1.9-GHz Chebyshev filter have been realized by patterning 10 mm/spl times/10 mm Y/sub 2/Ba/sub 3/Cu/sub 7-/spl delta//O thin films on MgO substrates. Insertion losses of the order of 0.2 dB have been measured, showing good agreement with the simulations.