Design and analysis of a decade bandwidth 180° hybrid coupler. Issue 1 (1st January 2013)

• Record Type: Journal Article
• Authors: Chan, Kevin K.M.; Tan, Adrian E.C.; Rambabu, Karumudi
• Is Part Of: IET microwaves, antennas & propagation. Volume 7:Issue 1(2013)
• Page Start: 71
• Page End: 77
• Publication Date: 2013-01-01
• Subjects: directional couplers; decade bandwidth 180° hybrid coupler -- insertion loss -- amplitude balance -- phase balance -- overlap ground pattern -- odd‐mode field coupling -- even‐mode phase velocity -- odd‐mode phase velocity; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2012.0467
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : 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.