Abstract
AbstractA frequency agile microstrip antenna for CP operation is presented. The frequency agility is achieved by symmetrical loading of two identical varactor diodes at the radiating edge of the patch, in which the operating frequency of the square microstrip antenna is electronically controlled by the reverse bias voltage of varactor, whereas circular polarization is achieved by four slits and a pair of truncated corners. Theoretical modal for an antenna is developed using modal cavity model and circuit theory concept. The results are validated with MOM‐based simulator and experimental results. A good agreement between the simulated, calculated, and experimental results is obtained. The tuning range is found to be 660 MHz (40.24%) and shows about 71% reduction in antenna size as compared to the conventional circular polarized antenna. Antenna shows consistent radiation characteristics for entire frequency tuning range. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2205–2209, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27033
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