Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1995-04-19
1995-12-26
Gensler, Paul
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
333161, H03H 718
Patent
active
054791391
ABSTRACT:
A ferroelectric phase shifter for shifting the phase of a radio frequency F) signal. The phase shifter includes a conductor line, a ground plane and a ferroelectric element between the conductor line and the ground plane to form a microstrip circuit through which the RF signal propagates. The ferroelectric element has a dielectric constant that can be varied as a function of a DC voltage applied to the ferroelectric element wherein the speed of the RF signal propagating through the ferroelectric element is a function of the dielectric constant. The phase shifter further includes a DC voltage source connected across the conductor line and the ground plane. The DC voltage source applies a variable DC voltage to the ferroelectric element in response to a control signal thereby to vary the dielectric constant of the ferroelectric element. The phase shifter further includes a controller circuit operating at a test frequency having a synchronous detector for detecting changes in the dielectric constant of the ferroelectric element. The controller circuit provides the control signal to the DC voltage source to vary the applied DC voltage as a function of the detected changes. In this manner, changes in the dielectric constant over time are compensated for and the phase shift is maintained substantially constant.
REFERENCES:
patent: 3355681 (1967-11-01), Beurrier et al.
patent: 5208213 (1993-05-01), Ruby
patent: 5212463 (1993-05-01), Babbitt et al.
patent: 5307033 (1994-04-01), Koscica et al.
Babbitt Richard W.
Drach William C.
Koscica Thomas E.
DiGiorgio James A.
Gensler Paul
The United States of America as represented by the Secretary of
Zelenka Michael
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