Title :
Quasi-Arbitrary Phase-Difference Hybrid Coupler
Author :
Wong, Yuk Shing ; Zheng, Shao Yong ; Chan, Wing Shing
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China
fDate :
6/1/2012 12:00:00 AM
Abstract :
Previous hybrid couplers have output phase difference that have either been 0°, 90°, or 180°. Other phase differences could only be realized using additional phase-shift elements. This increased circuit size and cost, and also degraded overall performance due to interconnecting mismatch losses. The proposed uniplanar arbitrary phase-difference coupler eliminates these additional components, thereby maintaining small size and good performance. Theoretical analysis is presented here together with measured results for two microstrip couplers for verification.
Keywords :
microstrip couplers; waveguide couplers; Butler matrix; interconnecting mismatch losses; microstrip couplers; phase shift elements; quasi-arbitrary hybrid coupler; uniplanar arbitrary phase difference coupler; Bandwidth; Butler matrix; Couplers; Equations; Impedance; Phase shifters; Phased arrays; 3-dB hybrid coupler; Arbitrary phase characteristics; Butler matrix; reflectometer;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2012.2187918
