This article is cited in 6 papers

Miniature coaxial resonator and related bandpass filter with ultra-wide stopband

B. A. Belyaev^abc, A. M. Serzhantov^abc, V. V. Tyurnev^abc, A. A. Leksikov^abc, An. A. Leksikov<sup>abc

a</sup> L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk
^c Siberian State Aerospace University

Abstract: Resonator of a new type is described, which is formed by two coaxial conductors applied onto the internal and external surfaces of a ceramic tube arranged in a metal case. An equation for the resonant frequencies is derived. In comparison to a standard coaxial quarter-wave resonator, the proposed device has a shorter length and manifold increased ratio of frequencies of the second resonance to the first resonance. The new resonator can be used for the creation of bandpass filters with ultra-wide stopband. The frequency response of a working prototype four-resonator filter is presented, in which the stopband at a -90 dB level extends up to a frequency that is 47 times greater than the central frequency of the passband.

Received: 08.08.2011

 English version: Technical Physics Letters, 2012, 38:1, 47–50

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