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J. Electromagn. Eng. Sci > Volume 16(4); 2016 > Article
Journal of Electromagnetic Engineering and Science 2016;16(4):206-209.
DOI: https://doi.org/10.5515/JKIEES.2016.16.4.206   
A Reconfigurable Directional Coupler Using a Variable Impedance Mismatch Reflector for High Isolation
Han Lim Lee1, Dong-Hoon Park2, Moon-Que Lee3
1School of Electrical and Electronics Engineering, Chung-Ang University
2U-Tel Co. Ltd.
3School of Electrical Engineering and Computer Science, University of Seoul
Correspondence:  Moon-Que Lee,Email: mqlee@uos.ac.kr
Abstract
This letter proposes a reconfigurable directional coupler that uses a variable impedance mismatch reflector to achieve high isolation characteristics in the antenna front end. The reconfigurable coupler consists of a directional coupler and a single-pole four-throw (SP4T) switch with different load impedances as a variable load mismatch reflector. Selection of the load impedance by the reflector allows cancellation of the reflected signal due to antenna load mismatch and the leakage from the input to isolation port of the directional coupler, resulting in high isolation characteristics. The performance of the proposed architecture in separating the received (Rx) signal from the transmitted (Tx) signal in the antenna front end was verified by implementing and testing the reconfigurable coupler at 917 MHz for UHF radio-frequency identification (RFID) applications. The proposed reconfigurable directional coupler showed an improvement in the isolation characteristics of more than 20 dB at the operation frequency band.
Key words: Antenna Front-End, High Tx/Rx Isolation, Reconfigurable Coupler, Reconfigurable Duplexer, Variable Reflector
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