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Abstract
A novel switchable slotline notch-band structure is presented and applied in the ultra-wideband (UWB) bandpass filter (BPF) to switch a notch band within the passband. The PIN diodes are used for electronic switching. Based on the equivalent-circuit method, the circuit model of the presented UWB switchable notch-band BPF has been developed. The presented UWB BPF with a switchable notch band has been designed, fabricated, and measured. The fabricated UWB filter has an extremely compact size of mm. The measured results agree with the simulated ones closely. The simulated and measured results show that a notch band centered at around 5.66 GHz can be turned on or off with no obvious degradation of the performance of the UWB BPF.
Acknowledgments
The work was supported in part by the National Natural Science Foundation of China (Grant No. 61271026), by National Natural Science Foundation of China-NSAF (Grant No. 10976005), by the Program for New Century Excellent Talents in University (Grant No. NCET-11-0066), and by the Research Fund of Shanghai Academy of Spaceflight Technology (SAST201243).