A Very Compact Dual-Polarized Antenna Array Topology Supporting Multiple 5G Bands

Abstract

This paper presents a very compact dual-polarized antenna array topology that allows for operation in the 26 GHz, 28 GHz, 37 GHz and 39 GHz bands designated for 5G uses. Four1 × 4 sub-arrays, namely low-band horizontally polarized (LB H-pol) array, high-band horizontally polarized (HB H-pol) array, low-band vertically polarized (LB V-pol) array and high-band vertically polarized (HB V-pol) array, are designed on a 12-layer laminate with total dimensions of 25 mm×6 mm×0.97 mm. The LB arrays achieve reflection coefficients of less than -10 dB from 24 – 30 GHz, and the HB arrays can operate from 37 – 43 GHz. Special techniques are used to reduce the mutual couplings between elements and enhance the array gain. Each sub-array features peak gain of more than 9.7 dBi at its center frequency. The 3-dB beam scanning ranges for the H-pol and V-pol arrays are ±45° and ±56° at 27 GHz, and ±42° and ±28° at 40 GHz, respectively.