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


A circularly polarized (CP) array antenna based mostly 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 contains a wide axial ratio (AR) bandwidth of 14p.c from 18.3 to GHz with gain . Then, the array is expanded to achieve higher gains. A array is intended, fabricated, and tested. Test results show that the array has an AR bandwidth of thirteen.eightpercent from 18.5 to 21.25 GHz and a peak gain of 25.nine dBic at twenty.five GHz.

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