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SIR CPW Bandpass Filter with Folded Feed Structure for Suppressing Spurious Harmonics  

박광선 (아주대학교 전자공학과)
이창언 (아주대학교 전자공학과)
천동완 (아주대학교 전자공학과)
이진택 (아주대학교 전자공학과)
신철재 (아주대학교 전자공학과)
Publication Information
Abstract
In this paper, we have proposed the folded feed structure for the spurious harmonic suppression and we have designed the SIR CPW bandpass filter using this feed structure. The characteristic of the proposed feed structure was similar to that of the lowpass filter has wide stopband region and this can be used usefully to the spurious harmonic suppression of the bandpass filter. From the simulation and the measurement result, SIR CPW bandpass filter with folded feed structure has good harmonic suppression characteristics up to 5.8 f$\sub$0/ with -20 dB suppression level.
Keywords
SIR; Feed Line; Spurious Frequency; Out-of-band;
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