Abstract: A phase cancellation circuit for a cavity filter including a sampler loop assembly arranged to receive an input signal, a variable loop assembly connected to the sampler loop assembly by a cable, wherein the variable loop assembly is arranged to transmit an output signal from cavity filter, wherein the sampler loop assembly samples a cancellation signal at an isolation frequency from the input signal and transmits the cancellation signal to the variable loop assembly via the cable, and, wherein the cable has a length equal to a multiple of a half-wavelength at the desired isolation frequency, wherein the cancellation signal undergoes a 180° phase shift by traveling through the cable, wherein the variable loop assembly combines the cancellation signal with the input signal to cancel the input signal at the isolation frequency due to the 180° phase shift for creating the output signal with a notch at the isolation frequency.

Abstract: A temperature compensation apparatus for a cavity filter including a plunger barrel, a compensation barrel having a first coefficient of thermal expansion, wherein the compensation barrel is housed with the plunger barrel, a tuning rod housed primarily within the compensation barrel, the tuning rod having a second coefficient of thermal expansion, and wherein the compensation barrel is physically in contact with the plunger barrel and the tuning rod for allowing a direct transfer of heat between the compensation barrel, the tuning rod, and the plunger barrel.

Abstract: A phase cancellation circuit for a cavity filter including a sampler loop assembly arranged to receive an input signal, a variable loop assembly connected to the sampler loop assembly by a cable, wherein the variable loop assembly is arranged to transmit an output signal from cavity filter, wherein the sampler loop assembly samples a cancellation signal at an isolation frequency from the input signal and transmits the cancellation signal to the variable loop assembly via the cable, and, wherein the cable has a length equal to a multiple of a half-wavelength at the desired isolation frequency, wherein the cancellation signal undergoes a 180° phase shift by traveling through the cable, wherein the variable loop assembly combines the cancellation signal with the input signal to cancel the input signal at the isolation frequency due to the 180° phase shift for creating the output signal with a notch at the isolation frequency.

Abstract: A temperature compensation apparatus for a cavity filter including a plunger barrel, a compensation barrel having a first coefficient of thermal expansion, wherein the compensation barrel is housed with the plunger barrel, a tuning rod housed primarily within the compensation barrel, the tuning rod having a second coefficient of thermal expansion, and wherein the compensation barrel is physically in contact with the plunger barrel and the tuning rod for allowing a direct transfer of heat between the compensation barrel, the tuning rod, and the plunger barrel.