An ultra-selective OLR – Based microstrip diplexer with minimal insertion loss for wireless communication system

Zakaria, Zahriladha and Hamdy Elabd, Rania and Al Gburi, Ahmed Jamal Abdullah and Jamil Alsayaydeh, Jamil Abedalrahim and Alhassoon, Khaled and Saeidi, Tale and Mohammed, Naba Jasim (2024) An ultra-selective OLR – Based microstrip diplexer with minimal insertion loss for wireless communication system. International Journal of Intelligent Engineering and Systems, 17 (2). pp. 83-94. ISSN 2185-310X

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Abstract

This paper presents a high-selectivity, low-insertion-loss open-loop resonator (OLR)-based microstrip diplexer designed for wireless communication systems. We employed a microstrip transmission line with two serial capacitive gaps, incorporating rectangular half-wavelength open-loop resonators, to create a bandpass filter (BPF) with remarkable selectivity. The intended BPFs are interconnected by a T-junction combiner, which is matched to both filters and the antenna port, thereby creating the modelled diplexer. The system is implemented on a Rogers TMM4 substrate featuring a loss tangent of 0.002, a dielectric constant of 4.7, and a thickness of 1.52 mm. The suggested diplexer has dimensions of (90×70) mm². It achieves a modest frequency spacing ratio of R=0.1646 in both transmit and receive modes, with resonance frequencies of ft = 2.191 GHz and fr = 2.584 GHz, respectively. The simulated structure demonstrates favorable insertion losses of approximately 1.2 dB and 1.79 dB for the two channels at fractional bandwidths of 1.24% (2.191 GHz) and 0.636% (2.584 GHz). The simulated isolation values at 2.191 GHz and 2.584 GHz are 53.3 dB and 66.5 dB, respectively. Notably, the simulated and measured results exhibit a high degree of consistency. However, minor variations between the simulated and actual results have been noted, primarily attributable to the inherent fabrication tolerances.

Item Type:	Article
Uncontrolled Keywords:	Microstrip diplexer, Band pass filter (BPF), Open loop resonator (OLR).
Divisions:	Faculty Of Electronics And Computer Technology And Engineering
Depositing User:	Norfaradilla Idayu Ab. Ghafar
Date Deposited:	06 Jan 2025 09:57
Last Modified:	06 Jan 2025 09:57
URI:	http://eprints.utem.edu.my/id/eprint/28113
Statistic Details:	View Download Statistic

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