Broadband High-Gain SIW Cavity-Backed Circular-Polarized Array Antenna

摘要

A circularly polarized (CP) array antenna based on substrate integrated waveguide (SIW) technology is presented. Circular polarization is achieved by applying the sequential rotation technique (SRT) with a well-designed sequential feed network and linear-polarized array elements. The proposed array has a wide axial ratio (AR) bandwidth of 14% from 18.3 to 21.1 GHz with gain . Then, the array is expanded to achieve higher gains. A array is designed, fabricated, and tested. Test results show that the array has an AR bandwidth of 13.8% from 18.5 to 21.25 GHz and a peak gain of 25.9 dBic at 20.5 GHz.