Design of Tunable Branch-Line Coupler and Wideband Antenna

• Main Authors: Cheng-Yuan Lee, 李承遠
• Other Authors: Ching-Wen Tang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/g723b9

碩士 === 國立中正大學 === 電機工程研究所 === 103 === This thesis includes two parts. The first part is design of tunable branch-line coupler based on varactor diodes. By ultilizing varactor diodes on the four corners of branch-line couper, tunable operating band is achieved with good amplitude and phase difference within operating band. Second part is design of wideband antenna with CPW feed. In order to reach wideband characteristic, four stepped impedance resonator slots which produce additional resonance points are applied to the patch antenna. All the circuits in this thesis are simulated with full-wave electromagnetic simulator, and the circuits have been fabricated and measured. The matched results between electromagnetic simulation and measurement can demonstrate the availability of all proposed circuits. Keywords – tunable branch-line coupler, varactor, CPW, wideband antenna.