Browse Prior Art Database

Continuously Variable Electrical Delay Line

IP.com Disclosure Number: IPCOM000096472D
Original Publication Date: 1963-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Fonatsch, HA: AUTHOR [+2]

Abstract

This variable delay line utilizes a sandwich-type construction. Circuit board 2 has printed on it transmission line 4 which serves as the conductive element of the delay line. Input signals are applied to terminal 6 and output signals are taken from terminal 8. Plate 10 is a dielectric foam slab which, when the delay line is fully assembled, rests directly on transmission line 4. Plates 12 and 14 are ground planes. Members 16 and 18 are pressure plates which both hold the structure together and provide for the variability of the time delays of the circuit.

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Continuously Variable Electrical Delay Line

This variable delay line utilizes a sandwich-type construction. Circuit board 2 has printed on it transmission line 4 which serves as the conductive element of the delay line. Input signals are applied to terminal 6 and output signals are taken from terminal 8. Plate 10 is a dielectric foam slab which, when the delay line is fully assembled, rests directly on transmission line 4. Plates 12 and 14 are ground planes. Members 16 and 18 are pressure plates which both hold the structure together and provide for the variability of the time delays of the circuit.

In its assembled form, bolt 20 is either tightened or loosened depending upon the required delay. When the bolt is tightened, plates 16 and 18 force ground plane 12 closer to transmission line 4 by compressing dielectric foam slab 10. This operation results in an increase in the distributed capacitance along the delay line and a resultant increase in its electrical delay.

If the bolt is loosened, foam slab 10 expands pushing ground plane 12 away from conductor 4. Such decreases the distributed capacitance and the associated electrical delay. By making plates 16 and 18 of relatively inflexible material, e. g., polystyrene, the delay through winding 4 varies quite uniformly. Instead of utilizing the winding pattern shown, other patterns can be substituted,
e. g., spiral type coils.

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