Dual-band bandpass filter derived from the transformation of a single-band bandpass filter

TL;DR

This paper introduces a straightforward method to convert a single-band bandpass filter into a dual-band filter using microstrip resonators, achieving compact design and good performance for wireless communication applications.

Contribution

A novel transformation technique from single-band to dual-band bandpass filters using U-shaped microstrip resonators, demonstrated with practical implementation and performance validation.

Findings

Dual-band filter operates at 1.35 and 1.45 GHz

Good agreement between theoretical and practical results

Prototype shows return loss >18 dB and insertion loss <0.1 dB

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 of 0.0023, dielectric constant 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.