Open AccessDesign and analysis of a decade bandwidth 180° hybrid coupler
Author(s) -
Chan Kevin K.M.,
Tan Adrian E.C.,
Rambabu Karumudi
Publication year - 2013
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2012.0467
Subject(s) - return loss , wideband , insertion loss , bandwidth (computing) , hybrid coupler , amplitude , physics , coupling loss , power dividers and directional couplers , materials science , optics , telecommunications , electronic engineering , engineering , optical fiber , antenna (radio)
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.