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J Electromagn Eng Sci > Volume 10(1); 2010 > Article
Journal of the Korean Institute of Electromagnetic and Science 2010;10(1):1-5.
DOI: https://doi.org/10.5515/JKIEES.2010.10.1.001   
Spurious Suppressed Substrate Integrated Waveguide Bandpass Filter Using Stepped-Impedance Resonator
Il-Woo Lee1, Hee Nam2, Tae-Soon Yun3, Jong-Chul Lee2
1Korea Marine Equipment Research Institute
2Dept. of Wireless Communications Engineering, Kwangwoon University
3Dept. of Radio Mobile Communication Engineering, Honam University
Abstract
A spurious suppressed bandpass filter is proposed and discussed using the stepped impedance resonator(SIR) on a substrate-integrated waveguide(SIW) structure with a double-layer substrate. The second resonance of the fundamental $TE_{10}$ mode can be controlled by adjusting the electrical length and impedance ratio of each SIR. The spurious suppressed SIW bandpass filter shows the measurement results of the insertion loss of 3.98 dB and return loss of less than 11.58 dB at the center frequency of 12 GHz. Also, the second spurious frequency is improved to about $1.5f_0$ compared with $1.33f_0$.
Key words: Substrate-Integrated Waveguide(SIW), Stepped Impedance Resonator(SIR), Bandpass Filter, Spurious, Double Layer

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