Patent ID: 7898369

Claim:
A temperature compensation apparatus for a cavity filter having a tuning assembly comprising: a plunger barrel housed within said cavity filter and secured to a support rod of said tuning assembly of said cavity filter of said cavity filter, said support rod operatively arranged to set a position of said plunger barrel with respect to said cavity filter; a compensation barrel having a first coefficient of thermal expansion, wherein said compensation barrel is housed within said plunger barrel; a tuning rod housed primarily within said compensation barrel, said tuning rod having a second coefficient of thermal expansion; and, wherein said compensation barrel is in direct contact with said plunger barrel and said tuning rod for enabling a direct transfer of heat between said compensation barrel, said tuning rod, and said plunger barrel wherein a difference between said first and second coefficients of thermal expansion enables said temperature compensation apparatus to substantially nullify any effects from temperature induced dimensional changes of said tuning assembly of said cavity filter.