SIW circularly-polarized filtering antenna

In this paper, a new design of planar circularly-polarized (CP) filtering antenna using substrate integrated waveguide (SIW) cavities is presented. The design is based on the dual-mode cavity structure using TE120 and TE210 modes. The satisfying filtering performance of the antenna is realized by a coupled-resonator circuit of the two SIW cavities. And the radiating element is a non-uniform ring slot integrated with the output cavity to form a cavity-backed CP ring-slot antenna. Commercial software package ANSYS HFSS is used to simulate this antenna. Simulated results show that the proposed antenna can provide both the reasonable good filtering and CP radiating performances simultaneously.