High power RF phase shifter

Wave transmission lines and networks – Coupling networks – Delay lines including long line elements

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Details

333160, H01P 118

Patent

active

054594421

ABSTRACT:
An adjustable phase shifter is formed of an RF transmission line having an internal cavity, in which the phase shift produced is determined in part by a mound of flowable dielectric material in the internal cavity. An inlet tube defines a chute for dispensing the dielectric material into the internal cavity and a capped outlet tube connected to a bottom end of the internal cavity defines another gravity chute through which the dielectric material is removed to lower the height of the mound, when the cap is removed from the tube. The electrical length of the phase shifter is increased with addition of dielectric material and decreased with removal thereby varying the effective length of the RF transmission line and the phase shift produced on the RF that propagates therethrough.

REFERENCES:
patent: 3432777 (1969-03-01), Taylor et al.
patent: 3631501 (1971-12-01), Buscher
patent: 3701058 (1972-10-01), Smith
patent: 3805197 (1974-04-01), Buscher
patent: 4788515 (1988-02-01), Wong et al.
patent: 4800350 (1989-01-01), Bridges et al.
patent: 4982171 (1991-01-01), Figlia et al.

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