Dual-band SIW filter using slot perturbation

Shraddha Sood; Vandana Niranjan; Vibhav Kumar Sachan

doi:10.1515/freq-2024-0267

Article

Dual-band SIW filter using slot perturbation

Shraddha Sood , Vandana Niranjan and Vibhav Kumar Sachan

Published/Copyright: June 2, 2025

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From the journal Frequenz Volume 79 Issue 7-8

Abstract

This work presents performance analysis of dual-band bandpass filter using substrate integrated waveguide technology. It includes two prototypes; featuring a dual-cavity working as dual-mode resonator and slot perturbation for creation of passbands. Design 1 and design 2 work on center frequencies of 7.35 GHz, 11.4 GHz and 7.3 GHz, 11.36 GHz respectively. The filter exhibits excellent performance in terms of measured in-band return loss of greater than 16 dB for both passbands and insertion loss of 0.96 dB and 1.63 dB for design 1. Design 2 has measured return loss of greater than 17 dB for both passbands and insertion loss of 0.98 dB and 1.92 dB, ensuring minimum losses. Additionally, simulation is performed using HFSS software for analysis of insertion loss, return loss, unloaded quality factor and group delay characteristics. The single layer filter is fabricated over RT Duroid 5,880 with ε_r value of 2.2 as substrate. Parametric analysis is performed to explore the optimum values of physical dimensions to ensure impressive Q factor and coupling in the design. The proposed design utilizes a multimode resonator and is miniaturized to provide a robust solution in specific microwave circuit designs and enables independent tuning of passbands to increase design flexibility.

Keywords: dual-band filter; insertion loss; multimode resonators; selectivity; substrate integrated waveguide (SIW); slot perturbation

Corresponding author: Shraddha Sood, Electronics and Communication Engineering Department, Indira Gandhi Delhi Technical University for Women, New Delhi, India, E-mail: pariaarav22@gmail.com

Research ethics: Not applicable.
Informed consent: Not applicable.
Author contributions: S.S. has developed the design concept, formulated and performed simulation using HFSS tool and measurements are verified for design feasibility. Both S·S., V.N. and V.S. contributed to the final version of the manuscript. V.N. and V.S. supervised the work done.
Use of Large Language Models, AI and Machine Learning Tools: None declared.
Conflict of interest: The authors state no conflict of interest.
Research funding: None declared.
Data availability: Not applicable.

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Received: 2024-08-22

Accepted: 2025-05-19

Published Online: 2025-06-02

Published in Print: 2025-08-26

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Articles in the same Issue

https://doi.org/10.1515/freq-2024-0267

Keywords for this article

dual-band filter; insertion loss; multimode resonators; selectivity; substrate integrated waveguide (SIW); slot perturbation