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Band pass filter with tunable phase cancellation circuit

  • US 20090121937A1
  • Filed: 11/14/2008
  • Published: 05/14/2009
  • Est. Priority Date: 11/14/2007
  • Status: Active Grant
First Claim
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1. A phase cancellation circuit for a cavity filter comprising:

  • a sampler loop assembly operatively arranged to receive an input signal to said cavity filter;

    a variable signal insertion loop assembly connected to said sampler loop assembly by a cable, wherein said variable signal insertion loop assembly is operatively arranged to transmit an output signal from said cavity filter;

    wherein said sampler loop assembly samples a cancellation signal at a desired isolation frequency from said input signal and transmits said cancellation signal to said variable signal insertion loop assembly via said cable; and

    ,wherein said cable has a length, and said length is equal to a multiple of a half-wavelength at said desired isolation frequency, wherein said cancellation signal undergoes a 180°

    phase shift by traveling through said cable, wherein said variable signal insertion loop assembly combines said cancellation signal with said input signal, wherein said 180°

    phase shift cancels said input signal at said isolation frequency for creating said output signal, and wherein said output signal substantially resembles said input signal but with a notch at said desired isolation frequency.

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