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Variable Length Printed Circuit Delay Line

IP.com Disclosure Number: IPCOM000094316D
Original Publication Date: 1966-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Deckert, ME: AUTHOR [+2]

Abstract

A variable delay line which comprises two relatively moving members 10 and 12 can be made to maintain a constant characteristic impedance throughout its range of variation. Such is realized by employing partially segmented signal carrying lines 14 and 16 on the members 10 and 12.

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Variable Length Printed Circuit Delay Line

A variable delay line which comprises two relatively moving members 10 and 12 can be made to maintain a constant characteristic impedance throughout its range of variation. Such is realized by employing partially segmented signal carrying lines 14 and 16 on the members 10 and 12.

Members 10 and 12 have their signal lines 14 or 16 spaced from ground plane 18 by intervening dielectric layer 20. The path of the signals through this variable delay line extends from one end 22 of signal line 14 to the other end 24 of signal line 16. Movement of members 10 and 12 relative to each other in the directions indicated by the arrows varies the length of this path and in so doing changes the delay provided by the delay line.

As shown by the vertical hatching, portions of the delay line are segmented. This is to prevent reflections in the uncoupled portions of the signal lines. Preferably members 10 and 12 are made in the form of disks which rotate around the common axis to produce the relative motion. Two of these delay lines, one of them lossless and the other distortionless, can be connected together in series to provide a variable delay line attenuator with a substantially constant delay.

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