Communications Satellite Corporation

Gary G Hawisher

Ronald E Stegens

A coplanar waveguide quadrature hybrid is herein disclosed which produces even E-field symmetry about the center line of transmission during both even-and odd-mode excitation. In a first embodiment of the present invention, a first coupling element of a generally elongated shape is bifurcated and is interconnected at its ends to form a first rectangular coupling element. A second rectangular coupling element is disposed within the first rectangular coupling element. In a second embodiment of the present invention, one of the short sides of a first rectangular coupling element is broken and is cross-coupled to a third rectangular coupling element similar to the second rectangular coupling element, the third rectangular coupling element being disposed within a fourth rectangular coupling element similar to the first coupling element. The fourth rectangular coupling element is then directly connected to the second rectangular element to form a composite coupling element. During odd-mode excitation, the resulting CPW structures do not create an E-field between the ground planes and thus eliminate the spurious 'slot-line' mode of operation of prior art CPW devices.

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Germantown, MD, United States of America

Gary G Hawisher