Open AccessCompact diplexer using microstrip half‐ and quarter‐wavelength resonators
Author(s) -
Yan JunMei,
Zhou HaiYing,
Cao LiangZu
Publication year - 2016
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.2016.2127
Subject(s) - diplexer , resonator , microstrip , coupling (piping) , chebyshev filter , signal (programming language) , wavelength , acoustics , optics , electronic engineering , physics , optoelectronics , materials science , electrical engineering , engineering , computer science , metallurgy , programming language
This Letter presents a compact microstrip diplexer. The high‐frequency signal path is constructed by two electrically‐coupling half‐wavelength resonators, its external coupling adopts the tapped line structure. The low‐frequency signal path is formed by two magnetically‐coupling quarter‐wavelength resonators, its external coupling is accomplished by microstrip coupling lines, which are formed from the tapped line structure and resonator of the high‐frequency signal paths. The novel combination of the two signal path removes the need of T‐junction in conventional diplexers. Meantime, the coupling strength of the two pass bands at the input port can be separately designed. A diplexer with Chebyshev frequency response at both signal paths with the central frequencies of 1.8/2.4 GHz is designed, fabricated and measured. The measured results give a good agreement with the simulated ones, which verifies the effectiveness of the diplexer.