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US 2006/0232359 A1Published application
Quadrature hybrid circuit
AssigneeNtt Docomo, Inc.
InventorsAtsushi Fukuda, Hiroshi Okazaki, Shoichi Narahashi
Life of this patent
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Abstract
Four variable reactance means (10-13) are connected, respectively, to the four ports (1-4) of a quadrature hybrid circuit which is composed of four ring-linked two-port circuits (180-183) each composed of a transmission line or multiple lumped reactance elements, so that by changing the reactance values of the four variable reactance means (10-13), operating frequency of the quadrature hybrid circuit can be selectively changed.
Claims14
A quadrature hybrid circuit, comprising:
- four two-port circuits interconnected in a ring, four junction points of said four two-port circuits defining four ports, said four two-port circuits being configured so that a high frequency signal input to one of the four ports is output from two of the other ports at an equal level with a mutual phase difference of 90 degrees, and
- four variable reactance means connected to said four ports, respectively, for varying operating frequency of the quadrature hybrid circuit.
Dependencies are inferred from the claim text.