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http://dx.doi.org/10.5515/KJKIEES.2018.29.3.151

Design of A Narrow Bandpass Filter with Wideband Harmonic Suppression Using Hairpin Step Impedance Resonators  

Park, Ju-Seong (School of Electronics Engineering, Kyungpook National University)
Mohyuddin, Wahab (School of Electronics Engineering, Kyungpook National University)
Choi, Hyun-Chul (School of Electronics Engineering, Kyungpook National University)
Kim, Kang-Wook (School of Electronics Engineering, Kyungpook National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.29, no.3, 2018 , pp. 151-158 More about this Journal
Abstract
This paper proposes a new design method for narrow bandpass filters using two cascaded hairpin step impedance resonators (SIRs) with wideband harmonic suppression. The proposed bandpass filter utilizes a suspended strip line (SSL) to maximize the characteristic impedance ratio, thereby maximizing the harmonic suppression bandwidth. As an example of the proposed design method, the SSL bandpass filter with a center frequency of $f_0=1.4GHz$ and fractional bandwidth of 5 % was implemented, and proved to suppress harmonics up to $7.5f_0$ with a passband insertion loss of approximately -0.9 dB. This result implies that the proposed SSL narrow bandpass filter (NBPF) can suppress the harmonic bandwidth more than two times as compared with the filter design on a microstrip line (MSL).
Keywords
Suspended Strip Line (SSL); Hairpin SIR; Narrow Bandpass Filter (NBPF); Impedance Ratio;
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