Wideband Designs of Gap-Coupled Rectangular Microstrip Antenna Using Parasitic C-Shaped Patches

Wideband gap-coupled designs of proximity-fed rectangular microstrip antenna along with variants of C-shaped patches are presented. The design of rectangular microstrip antenna yields a bandwidth of 427 MHz (33%) with peak gain of 7.64 dBi. The bandwidth and gain are enhanced by using multiresonator concept with C-shaped parasitic patches. Optimum result in gap-coupled structure with two layers of two and four C-shaped patches with bandwidth of 867 MHz (60%) shows peak gain of 9.76 dBi is realized. The proposed design is simple to implement, and the experimental results of fabricated prototype antenna show close agreement with the simulated results.