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Phased Matched Electrical Spacer

IP.com Disclosure Number: IPCOM000081268D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Clouser, PL: AUTHOR [+3]

Abstract

This spacer provides an easy method of phase matching circuits which are interconnected through a coaxial connector and cable.

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Phased Matched Electrical Spacer

This spacer provides an easy method of phase matching circuits which are interconnected through a coaxial connector and cable.

Phase matching is accomplished by inserting a 50 ohm impedance spacer 10 into the connector of the shorter cable. Spacer 10 effectively lengthens the shorter cable,so as to match its impedance to the longer cable to which it is to be matched. Spacer 10 is disk shaped and includes concentric inner and outer members 11 and 12. Member 11 is a dielectric such as TEFLON*. The outer member 12 is a metal shield such as KOVAR**. Alternatively, the spacer may use an air dielectric in lieu of the solid dielectric member 11.

Spacer 10, when the male and female parts 21, 22, respectively, are appropriately engaged, is placed over the male contact 23 associated with the partially shown coaxial cable 24. Spacer 10 controls the amount of engagement between parts 21, 22. The thickness T of spacer 10 adds the required phase length to the cable. Thickness T is variable and depends on the phase change required.

Spacer 10 provides a change Delta Phi in the phase of the microwave voltage propagating through the connector. This change is proportional both to the thickness T of the spacer 10 and the alternating voltage frequency F, as follows: Delta Phi (degrees) = (2 Pi) over (c)x(57)TF. where c is the velocity of propagation of the microwave voltage. Typical thickness parameters are 0.002 inch per degree of phase at approximat...