Band pass filter with tunable phase cancellation circuit
First Claim
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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Accused Products
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.
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Citations
14 Claims
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1. A phase cancellation circuit for a cavity filter comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of creating a notch in a signal at a desired isolation frequency transmitted through a cavity filter comprising the steps of:
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(a) receiving an input signal with a cavity filter; (b) sampling a cancellation signal from said input signal at said desired isolation frequency; (c) shifting said cancellation signal 180°
by transmitting said cancellation signal through a cable having a length equal to a multiple of a half-wavelength at said desired isolation frequency;(d) combining said cancellation signal with said input signal for cancelling said input signal at said desired isolation frequency, thereby creating an output signal that substantially resembles said input signal, but with a notch at said desired isolation frequency; and
,(e) transmitting said output signal from said cavity filter. - View Dependent Claims (10, 11, 12)
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13. A cavity filter comprising:
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a phase cancellation circuit for a cavity filter including; 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 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 over said length of said cable, wherein said variable signal insertion loop assembly combines said cancellation signal with said input signal to cancel said input signal at said isolation frequency due to said 180°
phase shift for creating said output signal, and wherein said output signal substantially resembles said input signal but with a notch at said desired isolation frequency. - View Dependent Claims (14)
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Specification