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W‐band microstrip band‐pass filter using branch‐line coupler with open stubs
Author(s) -
Hwang ChiJeon,
Lok Lai Bun,
Thayne Iain G.,
Elgaid Khaled
Publication year - 2010
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.25185
Subject(s) - stopband , passband , return loss , microstrip , microwave , insertion loss , bandwidth (computing) , center frequency , cutoff frequency , band pass filter , electrical engineering , transmission line , engineering , optoelectronics , materials science , electronic engineering , topology (electrical circuits) , telecommunications , antenna (radio)
This article presents the design and measurement of a microstrip band‐pass filter (BPF) using modified branch‐line coupler with asymmetric open‐circuit stubs in the W‐band frequency range. The fundamental topology consists of using the branch‐line coupler as a filtering section by loading the coupled ports with suitable lengths of open‐circuit stubs. Therefore, transmission responses with simultaneously good stopband and sharp cutoff slope are derived, while the passband bandwidth can be easily controlled by means of the design parameters of the filtering section. The proposed BPF structure has been designed and fabricated on GaAs substrate. The fabricated BPF shows a 3‐dB bandwidth from 81 to 107 GHz with insertion loss <2 dB at center frequency, rejection of 51 dB, and return loss better than 18 dB. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1436–1439, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25185