Compact LowPass Filters Using Novel Modified ΦShape  Defected Ground Structure

doi:10.13190/jbupt.201103.12.ladsh

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2011, Vol. 34 ›› Issue (3): 12-16.doi: 10.13190/jbupt.201103.12.ladsh

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Compact LowPass Filters Using Novel Modified ΦShape  Defected Ground Structure

Received:2010-09-07 Revised:2010-10-26 Online:2011-06-28 Published:2011-03-29
Contact: LA Dong-Sheng E-mail:ladongsheng@163.com

Abstract

Abstract:

In order to design a high performance miniaturized microstrip filter, a new Φshape defected ground structure (DGS) is proposed. A Lowpass filter is designed using the Φshape DGS with H shape open stubs line. A one single, twocascaded and threecascaded Φshape DGS lowpass filters is designed, simulated, fabricated and measured repectively. The transmission characteristics of the twocascaded Φshape DGS lowpass filter shows its advantages of compact size, high selectivity, low insertion loss and excellent passband performance. The frequency response of the threecascaded Φshape DGS lowpass filter presents the advantages of compact size; high selectivity; low insertion loss; better passband performance and high outband suppression of more than 40dB. Measurement shows a good agreement with the simulated results. It also validates the requirements of miniaturization and high performance for filters.

Key words: microstrip lowpass filter, Φshape, defected ground structure, H shape open stubs

CLC Number:

TN713

References

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Compact LowPass Filters Using Novel Modified ΦShape  Defected Ground Structure

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