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Design of a Broad Band-pass Filter with Stubs for Harmonics Suppression using the FSCS  

Choi, Young-Gu (Dept. of Electronics Engineering, Kwangwoon University)
Kim, Bok-Ki (Dept. of Electronics Engineering, Kwangwoon University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.1, 2008 , pp. 103-109 More about this Journal
Abstract
In this papaer, a new type of ${\lambda}_g/4$ short stub band pass filter and ${\lambda}_g/2$ open stub band pass filter are purposed. Both are designed using FSCS technique for harmonic suppression. The proposed filters that used FSCS technique and a broadband stop filter is integrated to band pass filter to suppress the harmonics. The BSF are also placed between stubs so that the size is larger than prevent as compared to conventional one. The propose filters have center frequency of 5.8 GHz, bandwidth of 50% and harmonics suppressin is 120% has in bandwith. The measurement results in the case of ${\lambda}_g/4$ short stub filter, insertion loss of 0.5 dB, return loss of 14 dB are achieved and in the case of ${\lambda}_g/2$ open stub filter, loss of 0.8 dB, return loss of 14.4 dB are achieved. The simulation results and the measurement results are almost the same.
Keywords
Stub-BPF; UWB-BSF; FSCS; Harmonic suppression;
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