A design method for patch antennas with wide frequency tunable range and stable conical radiation

Abstract

A design for patch antennas with a wide‐frequency tuning range is presented. The antenna structure is composed of a top‐loaded monopole and a parasitic shorted ring patch. With a variable capacitor and a microstrip exponentially tapered line, the operating frequency of the antenna can be tuned between two parallel resonant modes, both of which have symmetrical conical radiations. The key parameters of the proposed design are investigated for obtaining a maximum tuning range. A design procedure is also given. The results obtained demonstrate that the proposed antenna design can offer a frequency tuning range of more than 50%, and its radiation is stable within the range. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1441–1445, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26846

Compact dual-band circularly-polarized frequency reconfigurable microstrip antenna for BeiDou navigation satellite system application

“…Meanwhile, compared with conventional wideband or multiband antenna, they have the inherent advantage of suppressing the non-operating band noise, thereby greatly lowering the requirements for channel filters. Though the feature of circular polarization is becoming increasingly popular owing to its capabilities of reducing polarization mismatch and suppressing multipath interferences, currently most designs such as [24,25,26,27,28] concerning frequency reconfigurable microstrip antennas only support linearly polarized applications. Few frequency reconfiguration microstrip antennas in [29,30] focus on the realization of circular polarization.…”