Band pass filter with tunable phase cancellation circuit

Details Band pass filter with tunable phase cancellation circuit Band pass filter with tunable phase cancellation circuit

H - Electricity

01

P

H01P 1/207 (2006.01)

Patent

CA 2643879

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 1800 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.

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