The X-Band Active Asymmetrically Scanning Dual-Beam Leaky-wave Antenna for Satellite Communication

• Main Authors: Sheu Yu-Hau, 許祐豪
• Other Authors: Christina F. Jou
• Format: Others
• Language: en_US
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/98509700895341357579

碩士 === 國立交通大學 === 電信工程系 === 88 === The X-Band Active Asymmetrically Scanning Dual-Beam Leaky-wave Antenna for Satellite Communication Student: Yu-Hau Sheu Advisor: Dr. Christina F. Jou Institute of Communication National Chiao Tung University Abstract In this report, an active asymmetrically dual-beam scanning leaky-wave antenna integrating with an upconverter to control the scanning beam is presented. Two kinds of upconverters are studied, which are a resistive HEMT upconverter and an active HEMT upconverter. The resistive HEMT upconverter has conversion loss. The active HEMT upconverter has conversion gain. The resistive asymmetrically dual-beam scanning leaky-wave antenna can provide a fixed beam and a scanning beam. The measured scanning beam provides a 20°scanning angle in H-plane from 10.2GHz to 11GHz and its measured maximum EIRP is 17dBm. The fixed beam EIRP (Effective Isotropically Radiated Power) is 21dBm. The active asymmetrically dual-beam scanning leaky-wave antenna also has a fixed beam and a scanning beam. The measured scanning beam provides a 22°scanning angle in H-plane from 10.2GHz to 11.5GHz and its maximum EIRP is 21dBm. The measured fixed beam EIRP is 20dBm. Theses antenna are suitable for microwave transceiver system. At last, we developed a transceiver / receiver antenna. It utilized the aperture-fed leaky-wave antenna to develop a multi-beam antenna. The transmitting signal fed into center aperture, and the feeding signal coupled to the leaky-wave antenna, and scanning dual-beam pattern was obtained. The receiving signal obtained from the end-side of the aperture-coupled antenna. Its transmitting and receiving radiation patterns are observed, their scanning angles as 22°and 16°~18°, respectively. This antenna has the potential to be used in the transmit/receive modules such as smart antenna systems because both modules can use only one antenna.