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filter design: how to compensate temp drift

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y99lx

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Dear cavity filter experts,
Please discuss the soltions to improve the stability over temperature varying. Are there some commonly used solutions?

thanks
y99lx
 

biff44

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plated invar cavities, tuning screws with a controlled mechanical expansion vs. temperature.
 

y99lx

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thanks, but the expansion is usually not controllable. Is there any special design consideration for this problem?
 

biff44

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You make the cavity and tuning screw out of materials with different coefficients of expansion. As one drifts one way over temperature, the other brings it back.
 

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