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A waveguide having a tapered or stepped cross-sectional width and a series of amplitude detectors serves as a frequency discriminator.
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A waveguide having a tapered or stepped cross-sectional width and a series
of amplitude detectors serves as a frequency discriminator.
Referring to Figs. 1 and 2, microwaves of half wavelength greater than
dimension "w" are blocked from passage in waveguide 1. By forming the
waveguide as a cascade of successively reduced widths or a taper and adding
amplitude detectors 2 in the waveguide at the quarter wave positions receeding
each reduction in dimension "w," a frequency discriminator can be constructed.
The presence of a signal at discriminator 2a and in no other detector
identifies a particular frequency. A higher frequency detected by both detectors
2a and 2b indicates that the higher frequency at the waveguide position of 2b is
present and the indication by detector 2a is redundant. Further detection occurs
in like manner at successive detectors. The length of each waveguide section
determines the steepness of the slope of a curve of signal strength versus
frequency. A steep pitch and close spacing of the detectors broadens the
response. Differentiation can be undertaken to more exactly determine the
detected frequency. This discriminator can also be used as an activity detector
to resolve ambiguity in conjunction with a conventional discriminator.
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