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Design of differential wideband bandpass filters with miniaturized size based on dual‐mode defected ground structure
Author(s) -
Li Lin,
Yang J.X.,
Bao Jia,
Du J.J.
Publication year - 2015
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.29056
Subject(s) - passband , band pass filter , wideband , insertion loss , bandwidth (computing) , microwave , center frequency , multi band device , materials science , common mode signal , electronic engineering , physics , optoelectronics , engineering , electrical engineering , telecommunications , digital signal processing , antenna (radio) , analog signal
Dual‐mode defected ground structure (DGS) is presented to construct differential wideband bandpass filter (WBPF) with very compact size. This proposed DGS is composed of an etched rectangular loop with a central zigzag tapered structure on the bottom surface. Based on this DGS, the filter exhibits adjustable dual‐mode resonant characteristics under differential mode (DM) operation and widebandstop filtering characteristics under common‐mode (CM) operation. To verify the design concept, one filter to cover the UWB lower‐band has been designed, fabricated, and measured. The fabricated differential WBPF demonstrates a DM 3 dB fractional bandwidth of 59% with lower passband insertion loss of 0.52 dB, wider CM suppression better than 10 dB from DC to 11.5 GHz, and very compact size of 0.08λ g 2 , where λ g is the guided wavelength at the center frequency of the DM passband. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1210–1213, 2015