Browse Prior Art Database

Frequency Discriminator

IP.com Disclosure Number: IPCOM000050286D
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Camp, WO: AUTHOR

Abstract

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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Frequency Discriminator

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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