A Novel Wideband Filtering Antenna for Sub-6GHz 5G Base Station Application

A broadband filtering antenna is proposed in this work, which covers the whole 3.3-3.8 GHz working frequency band to meet Sub-6GHz 5G base station application. By adding loop branch and short-circuit L-shaped patch to the dipole, and loading a square parasitic ring below the dipoles, the proposed antenna achieved broadband and filtering functions. The results of simulation illustrate the proposed antenna works in a wide frequency band of 2.74-3.86 GHz (|S
11
| and |S
22
| <−18 dB), and the port isolation (|S
21
| <−23 dB). This proposed antenna has a high gain of 9.2±0.3 dB in the passband, and an out-of-band rejection of more than 14 dB is achieved at 1.70-1.88 GHz and 4.64-5 GHz.