Dual Linearly-Polarized Antenna Array With High Gain and High Isolation for 5G Millimeter-Wave Applications

A dual linearly-polarized (LP) high-order-mode antenna with high gain and high isolation is proposed for 5G millimeter-wave (mm-wave) applications. To obtain high gain and wide bandwidth, a <inline-formula> <tex-math notation="LaTeX">$2\times2$ </tex-math></inline-formula> slot-fed magneto-electric (ME)-dipole antenna elements are excited by a high-order-mode TM₄₃₀ cavity. Two substrate integrated waveguide (SIW) feeding networks that are vertically arranged in the bottom layers are employed to feed the high-order-mode cavity antenna for a double capacity, high isolation and low transmission loss. Moreover, an <inline-formula> <tex-math notation="LaTeX">$8\times8$ </tex-math></inline-formula> antenna array is fed by a pair of compact modified H-shaped full-corporate SIW networks. Measurement results show that an overlapped frequency bandwidth of 14.6% (36.8–42.6 GHz) with a peak gain of 25.8 dBi and an isolation of greater than 45 dB for the <inline-formula> <tex-math notation="LaTeX">$8\times8$ </tex-math></inline-formula> dual LP antenna array are achieved, which guarantee reliable high-speed data transmission and anti-interference capacity for 5G communications.