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Quintuple-mode wideband bandpass filters with improved out-of-band rejection

Published online by Cambridge University Press:  14 October 2019

Musab Hameed Open the ORCID record for Musab Hameed [Opens in a new window] ,
Gaobiao Xiao ,
Lina Qiu  and
Tayyab Hameed
Musab Hameed*
Affiliation:
Key Laboratory of Ministry of Education for Research of Design and EMC of High Speed Electronic Systems, Shanghai Jiao Tong University, Shanghai200240, People's Republic of China
Gaobiao Xiao
Affiliation:
Key Laboratory of Ministry of Education for Research of Design and EMC of High Speed Electronic Systems, Shanghai Jiao Tong University, Shanghai200240, People's Republic of China
Lina Qiu
Affiliation:
Key Laboratory of Ministry of Education for Research of Design and EMC of High Speed Electronic Systems, Shanghai Jiao Tong University, Shanghai200240, People's Republic of China
Tayyab Hameed
Affiliation:
Department of Electrical & Computer Engineering, Centre for Advanced Studies in Engineering (CASE), Islamabad44000, Pakistan
*
Author for correspondence: Musab Hameed, E-mail: musab88@sjtu.edu.cn
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Abstract

This paper presents design of quintuple-mode wideband bandpass filters, implemented with off-centered perturbed metallic cylinders in a rectangular waveguide cavity. Three perturbation cylinders are placed at the bottom of the rectangular waveguide cavity, along with a pair of perpendicularly fed coaxial lines; excite five quasi-transverse magnetic modes to realize the desired passband. The height of the waveguide cavity and the shape of the perturbation cylinders are exploited to shift the resonant modes far away from the passband and achieve a good out-of-band rejection and sharp skirt selectivity. The filter operates at the center frequency of 2.68 GHz with a wide fractional bandwidth of 43%. The proposed filter is fabricated with aluminum. The measured and simulated results are in good agreement with each other.

Keywords

Microwave filtermulti-mode resonatorquintuple-mode filtercavity filter
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Issue 4 , May 2020 , pp. 276 - 281
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019

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