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Bandpass filter with an ultra-wide stopband designed on miniaturized coaxial resonators |
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| Authors: | B. A. Belyaev A. A. Leksikov A. M. Serzhantov V. V. Tyurnev Ya. F. Bal’va An. A. Leksikov |
| Affiliation: | 1. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russia 2. Siberian Federal University, ul. Kirenskogo 26, Krasnoyarsk, 660074, Russia 3. Siberian State Aerospace University, pr. im. gazety Krasnoyarskii rabochii 31, 660014, Krasnoyarsk, Russia |
| Abstract: | Characteristics of a new miniaturized coaxial resonator are theoretically investigated. It is shown that the first resonant frequency of the resonator can be significantly lowered relative to the second one and the resonator dimensions can be considerably decreased as compared to those of a traditional dielectric-filled quarter-wavelength coaxial resonator. Based on the investigated resonator, a fourth-order bandpass filter has been designed and fabricated. The filter stopband at a level of no worse than ?90 dB extends to the frequency that exceeds the passband center frequency by a factor of 47. Calculated frequency responses are in good agreement with those measured on the fabricated filter prototypes. |
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