A Broadband SIW-Based Filtering Antenna for 5G mmWave Base Station Application

A broadband mmWave base station filtering antenna based on substrate-integrated-waveguide (SIW) structure is presented in this paper. The base station antenna consists of a pair of patches, two groups of L-shaped probes, and an SIW feeding structure. A wide band is obtained by etching the defected ground structure (DGS) and barbell slot on the SIW and loading the differential-fed L-shaped probe. Meanwhile, the filtering response is obtained by etching H-shaped slots on each radiating patch and adjusting the structure of SIW and probe. Simulation results show that the proposed antenna achieves an impedance bandwidth of 23.72-29.90 GHz and the realized gain is better than 6.3 dBi. The out-of-band suppression is greater than 12 dB.