| 摘要 |
The high power band-pass filters are made of sections of circular waveguide resonators with sections of waveguide in between them. In the center of the waveguide resonator a ferroelectric disc, with a hole in the center, is placed. A bias is applied to the inner side of the ferroelectric disc. On the application of a bias voltage, the permittivity of the ferroelectric disc changes. As a result, the resonant frequency of the circular cavity changes. Application of different levels of bias voltages produces different resonant frequencies of the filter. The interior conducting surfaces of the waveguide(s) and the waveguide resonator(s) have high Tc superconducting material and the waveguide flanges have high Tc superconducting material on the conducting surfaces. The band-stop filters are made of a section of a main waveguide with branch waveguide resonator(s) connected on the broad-wall of the main waveguide with waveguide sections in between the resonators. A ferroelectric circular disc, with a hole in the middle, is placed in the middle of the branch guide. The branch waveguide loaded resonator is tuned to the dominant mode resonant frequency. A bias voltage is applied to the inner side of the ferroelectric disc changing the permittivity of the ferroelectric material and consequently changing the resonant frequency of the band reject filter.
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