To read this content please select one of the options below:

Compact dual mode X-band SIW bandpass filter with wide spurious suppression using split square ring slot resonator

Sandhya Ramalingam (Department of Electronics and Communication Engineering, Sri Venkateswara College of Engineering, Sriperumbudur, India)
Umma Habiba Hyder Ali (Department of Electronics and Communication Engineering, Sri Venkateswara College of Engineering, Sriperumbudur, India)
Sharmeela Chenniappan (Department of Electrical and Electronics Engineering, Anna University Chennai, Chennai, India)

Circuit World

ISSN: 0305-6120

Article publication date: 21 September 2020

Issue publication date: 3 January 2022

290

Abstract

Purpose

This paper aims to design a dual mode X-band substrate integrated waveguide (SIW) bandpass filter in the conventional SIW structure. A pair of back-to-back square and split ring resonator is introduced in the single-layer SIW bandpass filter. The various coupling configurations of SIW bandpass filter using split square ring slot resonator is designed to obtain dual resonant mode in the passband. It is shown that the measured results agree with the simulated results to meet compact size, lower the transmission coefficient, better reflection coefficient, sharp sideband rejection and minimal group delay.

Design/methodology/approach

A spurious suppression of wideband response is suppressed using an open stub in the transmission line. The width and length of the stub are tuned to suppress the wideband spurs in the stopband. The measured 3 dB bandwidth is from 8.76 to 14.24 GHz with a fractional bandwidth of 48.04% at a center frequency of 11.63 GHz, 12.59 GHz. The structure is analyzed using the equivalent circuit model, and the simulated analysis is based on an advanced design system software.

Findings

This paper discusses the characteristics of resonator below the waveguide cut-off frequency with their working principles and applications. Considering the difficulties in combining the resonators with a metallic waveguide, a new guided wave structure – the SIW is designed, which is synthesized on a planar substrate with linear periodic arrays of metallized via based on the printed circuit board.

Originality/value

This study has investigated the wave propagation problem of the SIW loaded by square ring slot-loaded resonator. The electric dipole nature of the resonator has been used to achieve a forward passband in a waveguide environment. The proposed filters have numerous advantages such as high-quality factor, low insertion loss, easy to integrate with the other planar circuits and, most importantly, compact size.

Keywords

Citation

Ramalingam, S., Hyder Ali, U.H. and Chenniappan, S. (2022), "Compact dual mode X-band SIW bandpass filter with wide spurious suppression using split square ring slot resonator", Circuit World, Vol. 48 No. 1, pp. 1-13. https://doi.org/10.1108/CW-08-2019-0094

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

Related articles