Embedded Split Ring Resonator Tunable Notch Band Filter in Microstrip Transmission Lines

Farhad Farzami; Seiran Khaledian; Alex C. Stutts; Besma Smida; Danilo Erricolo

doi:10.1109/ACCESS.2022.3164699

IEEE Access (Jan 2022)

Embedded Split Ring Resonator Tunable Notch Band Filter in Microstrip Transmission Lines

Farhad Farzami,
Seiran Khaledian,
Alex C. Stutts,
Besma Smida,
Danilo Erricolo

Affiliations

Farhad Farzami: ORCiD; Department of Electrical and Computer Engineering, University of Illinois Chicago, Chicago, IL, USA
Seiran Khaledian: ORCiD; Department of Electrical and Computer Engineering, University of Illinois Chicago, Chicago, IL, USA
Alex C. Stutts: ORCiD; Department of Electrical and Computer Engineering, University of Illinois Chicago, Chicago, IL, USA
Besma Smida: ORCiD; Department of Electrical and Computer Engineering, University of Illinois Chicago, Chicago, IL, USA
Danilo Erricolo: ORCiD; Department of Electrical and Computer Engineering, University of Illinois Chicago, Chicago, IL, USA

DOI: https://doi.org/10.1109/ACCESS.2022.3164699
Journal volume & issue: Vol. 10
pp. 37294 – 37304

Abstract

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Novel design techniques for tunable and fixed frequency notch band filters are presented and validated with experiments. A notch band filter based on an Embedded Split Ring Resonator (ESRR) in a Microstrip Transmission Line (MTL) is presented. The physical dimensions of the ESRR determine the filter resonance frequency, which, when combined with a Varactor (Varactor Loaded ESRRs or VLESRRs), provides a continuously tunable resonance frequency. Tunable notch bands centered from 1.7 GHz to 4.8 GHz are obtained with resonators having an unprecedented electric length of $0.05~\lambda _{0}$ at the lowest frequency, corresponding to a physical length of 7 mm and a total occupied area of 8.5 mm2. Two or more ESRRs are proposed to provide a deeper single notch band, a wider notch band, and/or multi notch bands. The proposed ESRRs are used jointly with a trapezoidal antenna to form 1) a notch band at 2.5 GHz; and, 2) dual notch bands at 2.5 GHz and 3.5 GHz. In addition, ESRRs are used in a Low Pass Filter (LPF) with cutoff frequency of 1 GHz to suppress undesired harmonic at 3.46 GHz and improve band rejection. The proposed MTL loaded by ESRRs, LPF and trapezoidal antenna are fabricated, measured and the results of simulations and measurements are in good agreement.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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