Branch-line Coupler Designed by Selective Adjustable Output Power Ratio

• Main Authors: WANG,LO-KANG, 王羅綱
• Other Authors: TSENG,JAN-DONG
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/rscxfz

碩士 === 國立勤益科技大學 === 電子工程系 === 107 === This thesis present the research of proposed improve on Branch-line & Rat-Race coupler designed by selective adjustable output power ratio. Both circuits are based on original structure but improved by redesigned、simulated and tested, ameliorate with parallel transmission structure lines. According to user usage through a simply parallel transmission line switch to control changeable output power ratio, can completely achieve user requirements. First circuit is grounded on a Branch-line coupler, determined by connected or disconnection parallel transmission lines, to decide its output ratio distribution. The second circuit is Rat-Race coupler structure allocate with parallel transmission line, output power ratio changed to up/down or left/right connection to the parallel transmission line. Both circuits can be design, simulation and experiment to the requirements, and the output power ratio is determined by the ratio of the parallel transmission lines. The experimental physical circuit was contrived by FR-4 board with 1.6 mm depth and 4.3 relative dielectric. Confirmed by this experiment, the physical circuit measurement are consistent with the simulated circuit results, verify the circuit design proposed in this thesis is truthfully correctness.