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Cross‐coupled hairpin filter design using high‐permittivity substrates
Author(s) -
Hsu ChengShing,
Huang ChengLiang
Publication year - 2004
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.20158
Subject(s) - band pass filter , resonator , microwave , permittivity , microstrip , ceramic , materials science , coupling coefficient of resonators , filter (signal processing) , center frequency , waveguide filter , electronic engineering , electrical impedance , optoelectronics , prototype filter , electrical engineering , engineering , filter design , telecommunications , dielectric , composite material
Abstract A four‐pole elliptic‐function bandpass filter is designed using a compact miniaturized microstrip hairpin resonator. This miniaturized hairpin resonator is realized by using a stepped‐impedance structure with parallel coupled lines. In addition, the bandpass filter is implemented using a high‐permittivity ceramic substrate. These factors result in the reduction of the filter's size. The full‐wave simulator IE3D is used to design the hairpin resonator, and to calculate the coupling coefficient of the basic coupling strictures. The responses of the fabricated filters using Al 2 O 3 (ε r = 9.7, Q × f = 350,000 GHz) and MgNb 2 O 6 (ε r = 20, Q × f = 110,000 GHz) ceramic substrates are designed at a center frequency of 2 GHz. The compact size and the performance of this class of filters are demonstrated. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 419–423, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20158