Wideband Circularly Polarized Magnetoelectric Dipole Array Using TE340-Mode Cavity and Sequential Rotation Feed-Network at 60 GHz

Abstract

In this paper, a 4 × 4 60-GHz circularly polarized (CP) magnetoelectric (ME) dipole array based on TE340-mode substrate integrated cavity (SIC) and sequential rotation feed-network (SRFN) is proposed. The ME dipole array is constructed by 3 printed circuit board (PCB) layers with its assembled size of 21 × 23 × 2.4 mm3. The top layer is the radiation layer with 2 × 2 subarrays. The second layer includes 2 × 2 TE340-mode SICs. The bottom layer is the substrate integrated waveguide (SIW)-SRFN. By combining ME dipole, SRFN and high-order-mode SIC techniques, a compact 4 × 4 array with wide axial-ratio (AR) and impedance bandwidths is obtained. The measured results show that the − 10-dB impedance bandwidth is 24% (54–68.7 GHz), the 3-dB AR bandwidth is 25.9% (52–67.5 GHz), the 3-dB gain bandwidth is 22.5% (54–67.5 GHz) and the peak gain is 19.4 dBic at 62 GHz. The proposed array is a good candidate for 60 GHz wireless communications with its advantages of compact size, wide impedance bandwidth, wide AR bandwidth and high gain.