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Variable Pickoff Delay Line

IP.com Disclosure Number: IPCOM000097592D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Greer, RS: AUTHOR [+2]

Abstract

The apparatus has a flat type transmission line employed as a delay line. The transmission line is movable with respect to the signal pickoff point to vary the delay. The structural environment presents a substantially constant cross-section between the signal line of the transmission line and surrounding ground plane parts.

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Variable Pickoff Delay Line

The apparatus has a flat type transmission line employed as a delay line. The transmission line is movable with respect to the signal pickoff point to vary the delay. The structural environment presents a substantially constant cross- section between the signal line of the transmission line and surrounding ground plane parts.

The transmission line 1 is of the type having a signal line 2 spaced from a ground plane 3 by dielectric 4. The back of the line is covered by dielectric 5. When another turn 6 of the line is superimposed on the first section, the signal line of the second turn is insulated from the ground plane 3 of the first turn. The transmission line 1 is wound upon a spool having a dielectric body 7 which has embedded in it a ground plane 7A. The signal line 2 of the innermost turn of the transmission line sees the ground plane 7A in the same way that the signal line of the next turn sees the ground plane 3. The ground planes 3 and 7A and the signal line 2 are connected through a rotary connections 9 and 10 to a signal source. The other end of the transmission line, similarly wound upon a second spool 11, is terminated by its characteristic impedance 12.

Between the spools is provided a keyway 13 of conductive material having a dielectric insert 14. Again, the signal line 2 sees a ground plane at each side in the same manner as it does when wound upon either of the spools 7 and 11. The keyway 13 is provided with ground plane...