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A miniaturized UWB bandpass filter with tunable cut-off frequencies employing rectangular open-loop defected ground structure

Published online by Cambridge University Press:  23 May 2023

Ravi Prakash Verma ,
Bhagirath Sahu Open the ORCID record for Bhagirath Sahu [Opens in a new window]  and
Ashish Gupta Open the ORCID record for Ashish Gupta [Opens in a new window]
Ravi Prakash Verma
Affiliation:
Department of Electronics and Communication Engineering, Jaypee Institute of Information Technology, Noida, India
Bhagirath Sahu*
Affiliation:
Department of Electronics and Communication Engineering, Jaypee Institute of Information Technology, Noida, India
Ashish Gupta
Affiliation:
Department of Electronics and Communication Engineering, Jaypee Institute of Information Technology, Noida, India
*
Corresponding author: Bhagirath Sahu; Email: bhagirath.sahu@jiit.ac.in
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Abstract

This article presents a compact rectangular impedance resonator (RIR)–based ultra-wideband bandpass filter with an improved reflection coefficient within the passband and controllable cut-off frequencies. The proposed filter consists of anti-parallel coupled RIR coupled with rectangular open-loop defected ground structure (ROL-DGS) etched on the ground plane. The ROL-DGS ensures better in-band and out-off-band characteristics with reduced size due to its high Q-factor. The short- and open-circuit stubs control the lower (fCL) and upper (fCU) 3-dB cut-off frequencies, respectively, by originating transmission zeros independently with the help of variations in design parameters. As a result, the filter having a compact size of 0.216λCL × 0.176λCL is achieved, where λCL is the corresponding guided wavelength at the lower cut-off frequency fCL of 2.95 GHz. Further, an equivalent circuit is also modeled to explain the working of the proposed filter, and equivalent lumped parameters were extracted. Simulated results reveal that the reported filter passes the frequencies effectively within 2.95–11.44 GHz with fractional bandwidth of 117.9%. The simulated insertion loss values within the passband are less than 1.17 dB, and the reflection coefficient is better than −19.6 dB. Further, the proposed filter is fabricated, and it was found that the measured and simulation results are in well agreement.

Keywords

defected ground structureelectrical equivalent circuitopen-circuit stubshort-circuit stubultra-wideband bandpass filter
Type
Filters
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Special Issue 10: JNM 2022 Special Issue , December 2023 , pp. 1689 - 1697
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Copyright
© The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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