Dual-Band Circularly-Polarized SIW Antenna Array Using High-Order Modes in Ka-Band

A dual-band circularly-polarized (CP) antenna array based on the substrate integrated waveguide (SIW) in Ka-band is present in this paper. The antenna is consisted of SIW resonant cavity with slots and SIW feeding network. By using TM130 and TM
230
modes, a dual-band linearly-polarized antenna can be achieved. In 2×2 antenna subarray, CP characteristic is achieved by sequential rotation technique (SRT). For the sake of improving the directivity, a 4×4 antenna array with good performance is achieved. Finally, the antenna array achieved the operating bands of 27.50-27.83 GHz and 30.33-30.54 GHz, 3-dB axial ration (AR) bandwidths of 27.68-27.75 GHz and 30.45-30.51 GHz, and peak gains of 18.0 dBi and 17.6 dBi, respectively. Due to the advantages of high gain and circular polarization, the design can be applied for millimeter-Wave (mm-Wave) satellite communication systems.