STUDY OF METAMATERIAL-BASED MICROWAVE ANTENNAS

Abstract

The metamaterials (MTMs) with different functionalities have been investigated to improve the performance of electrically-large antennas for the future communications and remote sensing. Combing a new transformation mapping with gradient-index MTMs, a reliable PCB-stacked implementation method is proposed to design a flat ultra-wide-angle dual-polarized beamscanning antenna. Besides low cost and simple fabrication, the proposed light antenna recovers the original wide-scanning of Luneburg lens. Also, MTMs can serve as a reactive impedance surface (RIS). The excited surface waves manipulate the radiation of the transceiver antennas for a monostatic system in terms of boresight beam and SLLs. Therefore, a dual-polarized RIS-halved lens transceiver antenna is designed to improve the isolation and enlarge the overlapped beam coverage. Finally, the MTMs which act as an AMC surface with an in-phase reflection, have been studied so that the space wave decouples to the adjacent slots for a specific Ka-band substrate-integrated-waveguide slot array transceiver antenna.