SIR Based Dual-Band Bandpass Filter Using Source-Load Coupling

Volume 5 Issue 1 January - March 2017

Research Paper

SIR Based Dual-Band Bandpass Filter Using Source-Load Coupling

Farheen*, Sudhanshu Verma**

* PG Scholar, Department of Electronics and Communication Engineering, Madan Mohan Malaviya University of Technology, Gorakhpur, India.

** Assistant Professor, Department of Electronics and Communication Engineering, Madan Mohan Malaviya University of Technology, Gorakhpur, India.

Farheen., Verma, S. (2017). SIR Based Dual-Band Bandpass Filter Using Source-Load Coupling. i-manager’s Journal on Digital Signal Processing, 5(1), 24-28. https://doi.org/10.26634/jdp.5.1.13529

Abstract

This paper presents the designing of Dual-Band Bandpass Filter (DBBPF). The designed filter consists of two Stepped Impedance Resonators (SIR) of different impedance ratios. These two resonators are coupled parallel to source and load end. Due to source load coupling, several transmission zeros are generated. These transmission zeros will help in the suppression of harmonic responses. Location of transmission zeros can be adjusted by varying the gap between the input-output feed lines. The center frequencies of designed filter are 3.05 GHz and 6.2 GHz, with 3 dB bandwidth of 370 MHz and 1.9 GHz, respectively. In the designed filter, the fractional bandwidth and the center frequencies of both the pass bands can be controlled individually by controlling the impedance ratio. The filter shows better isolation between the pass bands with better out of band rejection without the spurious response. The designed filter has a very simple structure.