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Compact bandpass filter with spurious passband suppression using defected ground structure
Author(s) -
Fan Fangfang,
Yan Zehong
Publication year - 2010
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.24819
Subject(s) - passband , spurious relationship , band pass filter , microwave , filter (signal processing) , electronic engineering , insertion loss , physics , topology (electrical circuits) , electrical engineering , engineering , computer science , optoelectronics , telecommunications , machine learning
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