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Design and analysis of a decade bandwidth 180° hybrid coupler

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3 Author(s)
Chan, K.K.M. ; Electr. & Comput. Eng. Dept., Univ. of Alberta, Edmonton, AB, Canada ; Tan, A.E.C. ; Rambabu, K.

The design and analysis of a decade bandwidth 3 dB 180° hybrid coupler using tandem connection of two similar wideband 8.34 dB hybrids is presented. The designed coupler has return loss better than 12 dB over a decade bandwidth, insertion loss below 6 dB, amplitude balance within ° 1 dB, phase balance of ° 20° and isolation above 18 dB. Gap and overlap ground patterns at the junction of the tightly coupled to uncoupled region are introduced to improve isolation by preventing odd-mode field coupling and preserving equal even- and odd-mode phase velocities across the junction.

Published in:

Microwaves, Antennas & Propagation, IET  (Volume:7 ,  Issue: 1 )

Date of Publication:

January 11 2013

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