Premium
A compact wideband parallel‐strip 180° hybrid coupler
Author(s) -
Chiu L.,
Xue Q.,
Chan C. H.
Publication year - 2008
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.23926
Subject(s) - hybrid coupler , wideband , power dividers and directional couplers , microwave , bandwidth (computing) , rat race coupler , center frequency , engineering , wilkinson power divider , electrical engineering , electronic engineering , telecommunications , frequency divider , band pass filter
In this study, a wideband compact parallel‐strip 180° hybrid coupler with the center frequency of 2 GHz is presented. By replacing the 270° section in the 180° hybrid coupler with a parallel‐strip phase reversal swap, the total circuit size is reduced by half. In this structure, the phase gradients of the four arms of the coupler are equalized; therefore, the operation bandwidth is dramatically enhanced. S‐parameters of the coupler are simulated and measured with good agreement. As predicted from the measured data, the bandwidth of the 90% combining efficiency is increased from 45 to 124%. The proposed design achieves more than −25 dB signal suppression within the whole measured frequency range (0–4 GHz) as opposed to 1.8 to 2.2 GHz of the conventional design. The proposed 180° hybrid coupler can serve as a wideband in‐phase/differential power divider/combiner, which are essential for many RF and microwave subsystem designs. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3271–3274, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23926