An Active Feedback Microstrip Leaky Wave Antenna-Synthesizer Design with Suppressed Back Lobe

• Main Authors: Xing-Guang Chen, 陳信光
• Other Authors: Christina F. Jou
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/64858341867955280849

碩士 === 國立交通大學 === 電信工程系 === 87 === In the recent year, the automotive collision avoidance radar is the hot topic. There are many units experimenting with various radar systems in the past two decades. Hence, we plan to develop an automotive collision avoidance radar with planar antenna being operated in X-band. The transmit part of the X-band radar is made up of an X-band synthesizer with a leaky-wave antenna. And the antenna can scan over a certain angle range and have suppressed back lobe at the same time. By the frequency synthesizer structure, we achieve the goal. A feedback synthesizer antenna was designed, the measured radiated power difference between the main beam and back lobe is more than 15 dB at 9.25 GHz, and the scanning angle is about 5 degree as the synthesizer frequency sweeps from 9.25 GHz to 9.37 GHz. To reduce the area of the original transmit circuit, the structure of the side-fed by aperture-coupled LWA integrating with the frequency synthesizer is designed.