12.5GHz left-hand and right-hand circular polarization

• Main Authors: Shao-Hsuan Su, 蘇劭軒
• Other Authors: Shyh-Jong Chung
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/13198392570117124260

碩士 === 國立交通大學 === 電信工程系所 === 96 === In this thesis, a satellite array antenna which operated at 12.2~12.7GHz has been developed. We design left-hand and right-hand circular polarization antenna　arrays with single feed line. The disadvantage of this antenna is that the feeds of left-hand and right-hand circular polarization are too far, then the system needs two receivers. We have to use two RF-modules for receivers. Two receivers should be combined, so we improve this design. We use left-hand and right-hand circular polarization antenna arrays with dual feed line. Although receivers are combined , the antenna’s axis ratio is larger than 3 dB. The reason is that the power will couple from one microstrip line to the other one. In order to improve antenna’s axis ratio, we have to decouple the power. We will discuss the antenna’s structure, theory and how to decouple the power in this thesis.