Open AccessMiniaturised branch‐line coupler with ultra‐wide high suppression stopband
Author(s) -
Zong B.F.,
Wang G.M.,
Zhang C.X.,
Wang Y.W.
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2014.1150
Subject(s) - stopband , hybrid coupler , line (geometry) , transmission line , optics , power dividers and directional couplers , materials science , physics , optoelectronics , electrical engineering , engineering , mathematics , band pass filter , geometry
A compact branch‐line coupler with an ultra‐wide upper stopband is proposed based on a new type of transmission line. Consistent numerical and measurement results of the coupler are shown. The proposed branch‐line coupler operating at 0.875 GHz exhibits a stopband from 2.8 to 12.9 GHz with suppression levels better than −20 dB. The occupied size of the proposed branch‐line coupler is only 17.6% that of a conventional one operating at the same frequency.