High Isolation, Wide Aperture Antenna Array Using Auxiliary Feeds and EBG Surface for 5G Communication

In this article, we have proposed a novel miniatured two element circular antenna array operating at 28 GHz suitable for 5G wireless communication system. Each element has three circular sections embedded over an FR4 substrate. High isolation and good gain are the key requisites when the miniaturized antennas at very close proximity are employed. The paper has designed an antenna element consisting of three circular sections with two auxiliary feeds at 28 GHz. The mushroom-like EBG unit cell has been designed to obtain zero reflection phase at 28 GHz. Five such electromagnetic band-gap (EBG) unit cells, along with two vertical slots, are placed in between the two radiating patches for reduction of mutual coupling and enhancing the gain. The proposed compact structure with vertical slots and EBG bestows the isolation and gain up to − 34.76 dB and 7.81 dB, respectively. The antenna exhibits wide angle coverage in the E plane, and beam steering capabilities in the H plane as the phase variation between the antenna elements are applied.