Properties of the tunable waveguide-dielectric resonator of the millimeter band with the increased Q-factor

The resonance structures serve as the basis for many electronic devices. Therefore the creation of the effective tunable resonator is the actual and important problem. Using of the waveguide-dielectric resonator insures opportunity for the mechanical frequency tuning over a wide range but at the same time the Q-factor is changed. The last investigations suggested that the decrease of the eigen Q-factor of the tuning waveguide-dielectric resonator in the section of the circular cut-off waveguide can be decreased by using the resonance short-circuit plunger calculated on the given frequency. The investigations have been conducted for the 3-cm waveband. This paper is devoted to investigation of the possibility to increase Q-factor of the resonator of the waveguide-dielectric type in the millimeter band where influence of the contact imperfection between the plunger and waveguide walls is essential. As a result of the conducted investigations the Q-factor more than 2 000 in over the band of the tuning frequency was obtained for the resonator made of the section of the circuit cut-off waveguide with the Teflon dielectric in the 8-mm waveband.