Title :
A high-directivity microstrip directional coupler with feedback compensation
Author :
Jia-Liang Chen ; Sheng-Fuh Chang ; Chain-Tin Wu
Author_Institution :
Dept. of Electr. Eng., Nat. Chung Cheng Univ., Chiayi, Taiwan
Abstract :
A new directivity-enhancement method for a microstrip directional coupler is presented. The method utilizes feedback elements between the collinear ports of the parallel-line coupler to generate an isolation zero at the desired frequency. The closed-form equations for designing such compensating elements are developed. Experiments are conducted to verify the proposed method. More than 30 dB directivity improvement is achieved, compared to the conventional microstrip parallel coupler.
Keywords :
circuit simulation; circuit testing; compensation; feedback; microstrip directional couplers; network synthesis; closed-form equations; collinear ports; compensating elements design; directivity-enhancement method; feedback compensation; feedback elements; high-directivity microstrip directional coupler; isolation zero; microstrip directional coupler; microstrip parallel coupler; parallel line coupler; Circuit simulation; Coupling circuits; Directional couplers; Feedback; Frequency; Inductance; Inductors; Microstrip; Microwave Theory and Techniques Society; Transmission line matrix methods;
Conference_Titel :
Microwave Symposium Digest, 2002 IEEE MTT-S International
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-7803-7239-5
DOI :
10.1109/MWSYM.2002.1011569
