Ka-Band Substrate Integrated Cavity Antenna for Wide-Angle Beam-Scanning Phased Array

This paper proposes a millimeter-wave substrate-integrated cavity (SIC) antenna with widebeam functionality. The radiating structure of the antenna comprises a SIC and patches. The three slots formed by patches are equivalent to three magnetic current sources radiating electromagnetic waves. By adjusting the size of cavity and patches, the equivalent magnetic currents’ amplitude and distance can be altered to achieve a wide beam radiation pattern. The antenna exhibits wide half power beamwidth (HPBW) of 224° in the E-plane and 171° in the H-plane. Based on this antenna, an E-plane and an H-plane 1×8 phased array are designed. Simulation results show that the beam can scan from -75° to 75° with 1.6 dB gain fluctuation in E-plane array and from -65° to 65° with 1.3 dB gain fluctuation in H-plane array.