應用於MIMO系統之5 GHz場型可重組天線

Abstract

本論文提出一應用於MIMO系統的5 GHz場型可重組天線，主要由一全向性的輻射源配合4個頻率選擇面所構成，輻射源與每一頻率選擇面使用不鏽鋼鍍鎳的方式提高天線輻射效率，頻率選擇面由PIN二極體控制其狀態為反射或是穿透，藉由同時控制不同頻率選擇面的狀態可以產生8種不同方向場型，且能涵蓋360°範圍。由於使用波束合成技術，天線除了具有高增益的效果，能夠提高傳送距離與網路傳輸量外，也能同時抑制多路徑干擾。 本論文所設計之5 GHz天線所佔體積約為40 mm × 40 mm × 10 mm，天線操作頻段為5 GHz ~ 6 GHz的Wi-Fi頻段，並與2.4 GHz天線一同整合於直徑120 mm、高度10 mm的空間中。

In this thesis, a 5 GHz pattern reconfigurable antenna for MIMO system application is proposed. The pattern reconfigurable antenna is consisted of an omnidirectional feeding antenna with four frequency selective surfaces (FSS) and all of them are made of nickel-plated stainless steel in order to enhance the radiation efficiency. By controlling different FSS simultaneously, it can provide up to 8 kinds of pattern and cover a 360 degree range. Owing to the use of beamforming technique, the antenna as a high gain performance to increase the transmission distance and throughput and reduce the multipath interference. The size of antenna which can be operated within the 5 GHz Wi-Fi band covering from 5 GHz to 6 GHz designed in this thesis is about 40 mm × 40 mm with the height 10 mm, and it is integrated with 2.4 GHz antenna in a circle with a diameter of 120 mm.