Mahadevaswamy, Chandramouli H., Vasistha, Anup and Nwajana, Augustine ORCID: https://orcid.org/0000-0001-6591-5269 (2024) Dual-band bandpass filter derived from the transformation of a single-band bandpass filter. In: 2024 25th International Microwave and Radar Conference (MIKON). IEEE. ISBN 979-8350371611 ISSN 2770-3045 (Print), 2995-0570 (Online) (doi:10.23919/MIKON60251.2024.10633986)

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Abstract

The recent proliferation of personal wireless communication devices is driving the need for multi-band frequency selective components including multiplexers and dual-band filters. This paper presents a simple technique for transforming a single-band bandpass filter (BPF) into a dual-band BPF. A second order (two-pole) single-band bandpass filter was chosen for this research, giving rise to a fourth order (four-pole) dual-band bandpass filter after the proposed filter transformation. Both filters were then implemented using the compact U-shaped microstrip resonator for improved device miniaturization. The proposed work features a centre frequency of 1.4 GHz for the single-band bandpass filter, with a span of 3.4% fractional bandwidth. The dual-band bandpass filter operates at 1.35 and 1.45 GHz. The design implementation employs the commercially available Rogers RT/Duroid 6010LM substrate, having a dissipation factor (tan δ) of 0.0023, dielectric constant (εr) of 10.7, diel thickness (h) of 1.27 mm, and top/bottom cladding of 35 microns. The results reported for the theoretical and practical designs show good agreement and improved performance when compared to similar research works in literature. The practical responses of the prototype dual-band BPF indicate a good return loss of better than 18 dB across both bands, and an insertion loss of better than 0.1 dB. The design prototype achieved physical size of 0.23 λg x 0.18 λg. The results reinforce the design’s competitive edge in performance. λg is the guided wavelength for the microstrip line impedance at the centre frequency of the filter.

Item Type:	Conference Proceedings
Title of Proceedings:	2024 25th International Microwave and Radar Conference (MIKON)
Uncontrolled Keywords:	BPF, circuit conversion, coupling, microstrip, multi-band
Subjects:	T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Engineering (ENG) Faculty of Engineering & Science > School of Science (SCI)
Last Modified:	20 Nov 2024 11:54
URI:	http://gala.gre.ac.uk/id/eprint/47809

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