Compact quad-mode bandpass filter with sharp cut-off using folded parallel-coupled microstrip lines and semi-annular resonator

Marimuthu, J. and Abbosh, A. (2013). Compact quad-mode bandpass filter with sharp cut-off using folded parallel-coupled microstrip lines and semi-annular resonator. In: Microwave Conference Proceedings (APMC), 2013 Asia-Pacific. Asia-Pacific Microwave Conference, APMC 2013, Seoul, Korea, (902-904). 5 - 8 November 2013. doi:10.1109/APMC.2013.6694968

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Author Marimuthu, J.
Abbosh, A.
Title of paper Compact quad-mode bandpass filter with sharp cut-off using folded parallel-coupled microstrip lines and semi-annular resonator
Conference name Asia-Pacific Microwave Conference, APMC 2013
Conference location Seoul, Korea
Conference dates 5 - 8 November 2013
Proceedings title Microwave Conference Proceedings (APMC), 2013 Asia-Pacific
Journal name Asia-Pacific Microwave Conference Proceedings, APMC
Place of Publication Piscataway, NJ United States
Publisher I E E E
Publication Year 2013
Year available 2013
Sub-type Fully published paper
DOI 10.1109/APMC.2013.6694968
Open Access Status
ISBN 9781479914746
Start page 902
End page 904
Total pages 3
Collection year 2014
Language eng
Abstract/Summary A quad-mode microstrip bandpass filter with compact size, wide stopband and sharp lower and upper cut-off bands is designed. The proposed filter uses low impedance feeding network, folded parallel coupled microstrip lines (FPCML) and semi-annular middle resonator. The low impedance feeding network is utilized to enhance the coupling of the FPCML structure and to achieve a sharp lower and upper cut-off frequencies with extended upper stopband. Meanwhile, the low impedance semi-annular resonator is used to produce multiple resonant modes within the operating band and two transmission zeros to isolate that band from the stopbands. The proposed filter with a centre frequency of 2.45 GHz is designed and optimized using ADS Momentum. The filter shows excellent performance with 0.5 dB insertion loss, more than 26 dB attenuation at the wide stopband, more than 77 dB/GHz rate of cut-off at the edges of 35% fractional bandwidth passband.
Subjects 2208 Electrical and Electronic Engineering
Keyword Bandpass filter
Coupled microstrip lines
Resonator
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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