Multilayer Circularly Polarized Planar Aperture-Coupled Antenna for Satellite Applications

In this paper, a single-fed circularly polarized (CP) aperture-coupled antenna with multilayer structure is proposed for satellite applications in Ku-band. It is composed of substrate integrated waveguide (SIW) cavity, aperture coupling slot, hollow cavity, and stacked patches. CP operation is realized by embedding a pair of L-shaped strips around the two opposite corners of the square radiation patch. Simulation results show an impedance bandwidth (IBW) with Sl1<;-10dB from 13.5 to 19 GHz (33.8%) and a 3-dB axial ratio bandwidth (ARBW) from 15.5 to 16.4 GHz (5.6%), and gain of 5.8 ± 0.2 dBi across the 3-dB axial ratio bandwidth. The overall volume of the antenna is 0.47λ
₀
×.47λ
₀
×0.12λ
₀
at 15.8 GHz.