A multifrequency microstrip patch antenna comprising a driven patch and a plurality of parasitic elements placed underneath a driven patch is proposed. The antenna features a multifrequency behavior (5 operating band) with similar performance.
Anguera, J. [et al.]. Multiple parasitic microstrip antenna for multifrequency behaviour. A: IEEE International Symposium on Antennas and Propagation. "2003 digest, IEEE Antennas and Propagation Society international symposium: June 22-27, 2003, Columbus, Ohio". Comlumbus, Ohio: Institute of Electrical and Electronics Engineers (IEEE), 2003, p. 126-129.