A High Isolation, Low-Profile, Triple-Port SIW Based Annular Slot Antenna for Millimeter-Wave 5G MIMO Applications

This paper presents a compact, triple-port, millimeter-wave (mm-wave) substrate-integrated waveguide (SIW) based annular slot antenna. The presented antenna was fabricated on single dielectric layer, 30 mil TLY-5 substrate with standard PCB process. Measurement results show that, the proposed can achieve better than dB isolation between ports at 28 GHz, thanks to carefully tuned distances and ~90% radiation efficiency. Furthermore, it has 4.7 dBi 8 gain GHz for single-port double-port excitation cases respectively. Because of its easy integration high ports, be promising candidate used as monostatic simultaneous transmit receive (STAR) In addition, depending application, also directly adopted 5G phased array system in either transmitter or receiver, without requiring physical modification.