Title :
A study of meandered microstrip coupler with high directivity
Author :
Shih-Ming Wang ; Chin-Hsiung Chen ; Chi-Yang Chang
Author_Institution :
Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
A novel design technique to improve the directivity of a microstrip direction coupler by a meandered structure is proposed in this paper. Increasing of even-mode phase velocity by the proposed meandering method is reported for the first time. An analytical method to obtain closed-form equations or even-mode phase velocity is developed. The proposed structure is verified by experiments. More than 40 dB measured directivity improvement comparing to conventional microstrip coupler is achieved.
Keywords :
microstrip directional couplers; directivity; even-mode phase velocity; meandered structure; microstrip coupler; Coupling circuits; Design engineering; Dielectric substrates; Dispersion; Equations; Impedance; Integrated circuit interconnections; Microstrip; Permittivity; Phase estimation;
Conference_Titel :
Microwave Symposium Digest, 2003 IEEE MTT-S International
Conference_Location :
Philadelphia, PA, USA
Print_ISBN :
0-7803-7695-1
DOI :
10.1109/MWSYM.2003.1210884
