A Bandpass Filter Using Miniaturized Microstrip Square SIR

Hun NAM  Hyeonjin LEE  Yeongseog LIM  

IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.2   pp.236-239
Publication Date: 2003/02/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electromagnetic Theory
microstrip bandpass filter,  microstrip resonator,  NUFDTD,  cross coupling,  

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A four-pole quasi-elliptic function bandpass filter is designed and fabricated using a miniaturized microstrip square Stepped Impedance Resonator (SIR). The Nonuniform Finite Difference Time Domain (NUFDTD) method is used to design the resonator and to calculate the coupling coefficients of three basic structures. Theoretical and experimental results are presented. This filter is not only compact size but also has a wide upper stop band.