A new technique for absolute temperature compensation of tunable resonant cavities

The paper describes a cheap method for absolute temperature compensation of a tunable resonant cavity which exhibits linearity in tuning, at least over a narrow but useful frequency range, and for which a linear law relates the frequency change to the temperature change of at least 30¿¿C around the reference temperature. The technique considers compensated resonant cavities constructed from common conductors. Theory and practice show that a high degree of reduction in temperature dependency of the resonant frequency can be achieved.