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Compact semilumped bandstop resonators using the capacitively loaded parallel‐coupled microstrip line
Author(s) -
Lee Ju Gab,
Lee Wu Seong,
Ryu Jae Jong,
Moon Yeon Kwan,
Jang Joong Ho,
Kim Ha Chul,
Choi Hyun Chul
Publication year - 2007
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.22135
Subject(s) - capacitor , resonator , microstrip , transmission line , microwave , electrical impedance , electrical engineering , electric power transmission , optoelectronics , dielectric , electronic engineering , physics , topology (electrical circuits) , materials science , acoustics , engineering , telecommunications , voltage
Compact semilumped bandstop resonators are simply designed using parallel‐coupled microstrip line and lumped capacitors. The lumped capacitors loaded in between coupled lines increase the odd mode electrical length, and the frequency of transmission zero can be controlled by the lumped capacitors. For the accurate estimation of the transmission zero frequency, the four‐port impedance parameter is derived using the even/odd mode analysis in an inhomogeneous dielectric medium. Two types of the bandstop resonators are proposed using the coupled line with the length of λ g /8 (@2 GHz), and the calculated and measured results of transmission zero frequency are compared in 1–3 GHz ranges. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 367–369, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22135