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Ground Isolated Microwave Coupler

IP.com Disclosure Number: IPCOM000086593D
Original Publication Date: 1976-Oct-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Walewski, LG: AUTHOR

Abstract

These structures are used to couple data signals while achieving ground isolation. The coupling of energy from one transmission line to another with reference to a ground plane or planes is known. However, the structures described herein enable the coupling of energy from one transmission line, referenced to ground, to a second transmission line, not referenced to ground. The coupler consists of two external ground planes and two internal transmission line planes. The transmission lines on one plane transfer energy to the transmission lines on the other plane. Fig. 1 illustrates the inner planes in their simplest form. Also shown are the signal source and ground connections (AC or DC grounds).

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Ground Isolated Microwave Coupler

These structures are used to couple data signals while achieving ground isolation. The coupling of energy from one transmission line to another with reference to a ground plane or planes is known. However, the structures described herein enable the coupling of energy from one transmission line, referenced to ground, to a second transmission line, not referenced to ground. The coupler consists of two external ground planes and two internal transmission line planes. The transmission lines on one plane transfer energy to the transmission lines on the other plane. Fig. 1 illustrates the inner planes in their simplest form. Also shown are the signal source and ground connections (AC or DC grounds).

A top view of the coupler 1 (viewed through the ground planes) would show the superposition of the planes such that the center line of the transmission line in the radiating plane is coincident with the center line of one of the transmission lines in the pickup plane.

Fig. 2, a cross-sectional view, more clearly shows this. The center of the radiating transmission line is connected to a signal source operating at the frequency at which the line becomes two quarter-wave resonators. The pickup transmission line configuration consists of two parallel lines connected at their center and at one end. The coupled energy then appears at the other end. The half of the structure which is connected by the end portion la and center portion 1b forms a "...