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Quasi-Arbitrary Phase-Difference Hybrid Coupler

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3 Author(s)
Yuk Shing Wong ; Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China ; Shao Yong Zheng ; Wing Shing Chan

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.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:60 ,  Issue: 6 )