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Compact bandpass filter with spurious passband suppression using defected ground structure

✍ Scribed by Fangfang Fan; Zehong Yan

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
215 KB
Volume
52
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

In this article, a novel and compact hairpin bandpass filter (BPF) using defected ground structure (DGS) is discussed. By placing a novel cascaded z‐slot DGS at the location of the input and output port, the first spurious passband can be rejected. The elaborate analysis of the z‐slot DGS has been given. The equivalent circuit of the z‐slot and how the dimension affects the frequency response are presented. In addition, as the DGS is etched on the backside of the substrate, no extra aera is added to the final layout. The experimental results demonstrate that this filter has low insertion loss, small size, and with a rejection level of more than 35 dB for the first spurious passband. The measured results of the proposed BPFs are in good agreement with the simulated ones. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 17–20, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24819

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