Volume 22, Issue 3 (September 2026)                   IJEEE 2026, 22(3): 4043-4043 | Back to browse issues page

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Askari K, Abbasalizadeh S. Analysis of A Novel Quasi-Reflectionless Microstrip Bandpass Filter Using A New Simple Approach. IJEEE 2026; 22 (3) :4043-4043
URL: http://ijeee.iust.ac.ir/article-1-4043-en.html
Analysis of A Novel Quasi-Reflectionless Microstrip Bandpass Filter Using A New Simple Approach
Kaveh Askari , Soolmaz Abbasalizadeh
Abstract:   (143 Views)
This paper proposes a new one-cell single-port microstrip bandpass filter (BPF) named the main cell, which consists of a band-pass section connected with one band-stop section at the input port. Considering the main cell, this paper provides a new two-cell two-port BPF with quasi-reflectionless behavior at its input and output ports. This two-cell two-port BPF is constructed with three sections of a series bandpass filter at the center and two shunt-connected bandstop filters at the input and output ports. Moreover, this paper analyzes the BPF’s S-parameters and, to the best of the authors’ knowledge, derives its formulas in a closed form, for the first time. Furthermore, to the best of the authors’ knowledge, this paper presents a novel approach for determining the filter’s cut-off frequency by utilizing the derived S-parameters. This paper compares the calculated results with the simulated to evaluate the analysis. In addition, this paper proposes a three-cell two-port BPF to increase the out-of-band attenuation loss. Finally, this paper manufactures the two-cell and three-cell BPFs on an FR-4 substrate to evaluate the efficiency of the presented concepts. The comparisons between the electromagnetic simulation and the measurement results have good agreements with each other. The measurement results of the three-cell two-port BPF show a center frequency of 2.6 GHz, a bandwidth of 0.27 GHz, and a minimum in-band insertion loss of -3 dB. Also, the fabricated filter has an in-band return loss lower than -8 dB over the entire bandwidth and a stopband attenuation level better than 50 dB.
Keywords: Bandpass filter, Bandstop filter, Cut-off frequency Analysis, Microstrip filter, Reflectionless bandpass filter.
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Type of Study: Research Paper | Subject: Analog Circuits
Received: 2025/07/14 | Revised: 2026/04/26 | Accepted: 2026/01/04
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