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A modified wideband bandpass filter based on a bandstop filter is realised using half-wavelength and one-wavelength open-circuited resonators. Six transmission zeros are utilised to obtain the sharp rejection characteristics over a broad stopband. The passband bandwidth can be varied by changing the impedance of the configuration. A compact prototype filter with 27% bandwidth is demonstrated. Without...
Dual-band bandstop filters using open-circuited stub-loaded resonators are presented. The first and second resonant frequencies of the opencircuited stub-loaded resonator can be flexibly controlled by tuning the length and position of the open-circuited stub. To illustrate the concept, a dual-band bandstop filter has been designed, fabricated and measured. The prototype of the dual-band bandstop filter...
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