Planar ferro-electric phase shifter

Details Planar ferro-electric phase shifter Planar ferro-electric phase shifter

1992-07-22

1993-05-18

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

H01P 118

Patent

active

052124630

ABSTRACT:
A planar ferro-electric phase shifter which is compatible with commonly-u microwave transmission media to include microstrip, inverted microstrip, and slot line. The ferro-electric material, Ba.sub.x Sr.sub.1-x TiO.sub.3, which has a high dielectric-constant, is the phase shifting element. In the microstrip embodiment, the microstrip circuit consists of a ferro-electric element interposed between a conductor line and a ground plane. A DC voltage is applied between the conductor line and the ground plane, thereby controlling the dielectric constant of the ferro-electric material. The dielectric constant of the ferro-electric element in turn controls the speed of the microwave signal, which causes a phase shift. Microwave energy is prevented from entering the DC supply by either a high-impedance, low pass filter, or by an inductive coil. DC voltage is blocked from traveling through the microstrip circuit by a capacitive high-voltage DC bias blocking circuit in the ground plane.

REFERENCES:
patent: 4105959 (1978-08-01), Stachejko
patent: 5032805 (1991-07-01), Elmer et al.

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