Open AccessCompact and high isolation microstrip diplexer for GPS and UWB application
Author(s) -
Deng H.W.,
Zhao Y.J.,
Fu F.,
Zhou X.J.,
Liu Y.Y.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2012.3247
Subject(s) - diplexer , microstrip , resonator , electronic engineering , impedance matching , electrical impedance , insertion loss , transmission line , acoustics , materials science , computer science , topology (electrical circuits) , electrical engineering , optoelectronics , telecommunications , engineering , physics
A novel microstrip diplexer with low insertion loss, high selectivity and isolation performance is proposed through the combination of two compact filters composed of short‐circuit centred stepped impedance resonators and, a side‐coupled shorted microstrip line, which are designed for GPS and UWB application, respectively. Due to the intrinsic characteristics and mutual loading effect of the two filters, multiple transmission zeros can be created to improve the out‐of‐band rejection and isolation of the diplexer. More compact size is obtained without an extra junction matching networks. Simulated results of the fabricated diplexer agree well with measured ones.