Dual-Band Microstrip Stepped-Impedance Bandpass Filter with Defected Ground Structure

J. P. Wang Institute of Applied Physics, University of Electronic Science and Technology of China 610054, Chengdu, China

B. Z. Wang Institute of Applied Physics, University of Electronic Science and Technology of China 610054, Chengdu, China

Y. X. Wang Institute of Applied Physics, University of Electronic Science and Technology of China 610054, Chengdu, China, School of Physics and Electronic Information, China-West Normal University, 637002, Nanchong, China

Y. X. Guo Institute for Infocomm Research, 20 Science Park Road, #02-21/25, TeleTech Park, Singapore 117674

Pages 463-470 | Published online: 03 Apr 2012

Cite this article
https://doi.org/10.1163/156939308784150335

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Abstract

A compact dual-band stepped impedance bandpass filter with a defected ground structure (DGS) is proposed. The half-wavelength stepped impedance resonator is adopted to result in two tunable passbands. A DGS is constructed under the two coupling stepped impedance resonators to achieve good passband performance. Compact size and high selectivity is realized with the tap input/output coupling structure. For demonstration, one RF filter operating at 2.45 and 5.2 GHz is designed. Simulated and measured results are provided.

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