Coplanar waveguide quadrature hybrid having symmetrical coupling

Details Coplanar waveguide quadrature hybrid having symmetrical coupling Coplanar waveguide quadrature hybrid having symmetrical coupling

1982-11-22

1986-05-27

LaRoche, Eugene R.

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333246, H01P 518

Patent

active

045918120

ABSTRACT:
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.

REFERENCES:
patent: 4313095 (1982-01-01), Jean-Frederic

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