Meta-material 을 이용한 높은 격리도 특성을 갖는 중계기 시스템용 패치 안테나 설계

Abstract

Wireless communication technologies have been developing rapidly in order to provide various data services at high data rates. In order to increase the signal strength in low-signal areas, channel-selective repeater systems are used to connect a base station with user terminals. In this thesis, a dual-fed, dual-band patch antenna with enhanced isolation is proposed using mushroom structures for the repeater systems. The stop-band characteristics of the 2D-metamaterial (MTM) coupled transmission line are utilized. The wide stop-band characteristic is achieved via the modified mushroom structures. The isolation between the feeding ports can be improved by selecting a suitable size for the proposed mushroom structures. The proposed antenna has a VSWR below 1.5, a gain above 5.0 dB, and an isolation between two ports less than -40 dB over the WCDMA band from 1.92 GHz to 2.17 GHz and over the Mobile WiMAX band from 3.4 GHz-3.6 GHz.