A study of reverse response dual mode coupler and crossover structure using phase reconfigurable synthesized transmission line

• Main Author: Taufiqqurrachman
• Other Authors: Tzyh-Ghuang Ma
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/6kyr62

碩士 === 國立臺灣科技大學 === 電機工程系 === 106 === This thesis presented design concept, synthesis equations and experimental results for a reverse response dual-mode coupler and crossover structure using phase reconfigurable synthesized transmission line (PRSTL). The proposed reverse response dual-mode coupler design is realized by using integration of three kinds CRLH line where each CRLH line is composed of two uniforms transmission line as a right-handed section and a left-handed π-network. The π-network part consists of two shunt inductors along with a series capacitor inserted in-between. The impedance and phase responses of the CRLH lines are controlled at both bands. In addition, the proposed crossover structure is formed by two kinds of PRSTL in between two quadrature hybrid couplers. A key of the proposed crossover structure lies on PRSTL that consists of a left-handed T-network and two segments of a uniform transmission line as a right-handed section. The T-network is formed by two series capacitors and a shunt inductance in-between. By replacing two series capacitors with varactors diodes, the PRSTL can be reconfigured between two states whereas the characteristic impedance remains the same. According to the experimental results, a good agreement between the simulated and measured result is presented and observed. The proposed reverse response dual-mode coupler has an acceptable performance both functioning as a 180° hybrid couplers at the low-band and a 90° hybrid couplers at the high-band. Moreover, the proposed crossover structure has a good in-band response and high port-to-port isolations for all conditions.