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Compact bandpass filter with wide-stopband using substrate integrated waveguide cavities and short-circuited coplanar line

Published online by Cambridge University Press:  26 November 2019

Amit Ranjan Azad Open the ORCID record for Amit Ranjan Azad [Opens in a new window]  and
Akhilesh Mohan Open the ORCID record for Akhilesh Mohan [Opens in a new window]
Amit Ranjan Azad*
Affiliation:
Department of Electrical and Electronics Engineering, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Telangana – 500078, India
Akhilesh Mohan
Affiliation:
Department of Electronics and Electrical Communication Engineering, Indian Institute of Technology Kharagpur, West Bengal – 721302, India
*
Author for correspondence: Amit Ranjan Azad, E-mail: amitranjanazad@gmail.com
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Abstract

This article presented a compact bandpass filter with wide-stopband performance. Two substrate integrated waveguide (SIW) cavities and a short-circuited coplanar line introduced between the two cavities are used to realize a compact third-order bandpass filter. The passband is generated by combining the resonant frequency of TE101 mode of the SIW cavities and the fundamental resonant frequency of the short-circuited coplanar line. The size of the proposed filter reduces significantly in comparison with conventional third-order SIW filters. Moreover, the center frequency (CF) and the bandwidth of the filter can be controlled by adjusting the structural parameters of the filter. In addition, the first higher-order mode TE102 of the SIW cavity is suppressed by minimizing the coupling of TE102 mode in order to obtain wide-stopband performance. The proposed filter is designed, fabricated, and measured, and the simulation and measurement results show a good agreement. The filter exhibits compact size, low loss, and a rejection higher than 20 dB up to 1.94f0.

Keywords

Bandpass filtercompact sizeshort-circuited coplanar linesubstrate integrated waveguidewidebandwide-stopband

Information

Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Issue 5 , June 2020 , pp. 345 - 351
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019

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