Capacitively loaded microwave cavity resonator with temp. compensation - is frequency-stabilised by gap between stub and wall deformed centrally by thermal expansion of strap

摘要

The cavity is formed by two walls (W1, W2), a sleeve (M) of circular or square cross-section and a loading stub (BSt) mounted pref. at the centre of the plane wall (W1). All four components are mfd. pref. of Invar or other metal having a low thermal expansion coefft. A strap (Bu) having a higher coefft. of expansion is stretched across the other wall (W2), spaced from it by a central block (K1) and screwed (S1, S2) to the sleeve (M). ADVANTAGE - Frequency of resonance is adjusted automatically to counteract detuning introduced by thermal expansion of entire cavity.