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A novel compact microstrip bandstop filter using spiral resonators (SRs) is proposed. An array of SRs topology which is etched on the center line has stopband characteristics. And this microstrip bandstop filter can be implemented with very small size because of the sub-wavelength effect of SRs. The 3-cell SR filter is fabricated and verified by measurements. We have obtained low insertion loss in...
In this paper, a novel compact bandstop filter having low insertion loss and low radiation loss is presented. The proposed filter uses a quarter-wavelength open-stub resonator with direct-connected microstrip transmission line. Due to the narrow gap between a resonator and a ground, we can realize low mismatch and the bandstop filter shows low insertion loss. In addition, this structure can reduce...
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