A Filtenna Based on Gap Coupled Multilobate Design for C-Band Applications

A filtenna for operating in the C-band is presented. The proposed filtenna comprises two multilobate patches in close proximity. The main patch is directly fed by a coaxial feed, while a parasitic patch is gap-coupled, exploiting the self-complementary of an original multilobate design. The arrangement of these two patches permits to design an effective filtenna operating in circular polarization for the C-band. The proposed design exhibits a maximum left hand gain of 6.21 dB, a cross polarization discrimination exceeding 15 dB at the frequency of 5.8 GHz. The filtering properties of the antenna shows with a sharp stop-band at 6.2 GHz, where the broadside gain drops below -7.48 dB, meaning 13.70 dB of isolation.