Wave transmission lines and networks – Coupling networks – Delay lines including long line elements
Patent
1989-10-23
1991-07-16
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Delay lines including long line elements
333161, H01P 118
Patent
active
050328050
ABSTRACT:
An electrically controlled RF phase shifter having an active medium formed rom a ceramic material the permittivity of which may be varied by varying the strength of an electric field in which it is immersed. The phase shifter includes the ceramic material having electrodes mounted thereon that are connected to an adjustable d-c voltage source. The phase shifter may be placed in an RF transmission line that includes appropriate input and output impedance matching devices such as quarter-wave transformers. The phase of the RF power exiting the phase shifter will depend on the effective electrical length of the material in the active medium. Because changes in the permittivity of the material will produce corresponding changes in the electrical length of the material, changes in the phase of the RF power transmitted therein will be produced. The quarter-wave transformers may also be made of a similar adjustable permittivity material. Control voltages applied to the transformers are used to adjust the amount of output power. An interdigitated electrode is used to reduce the amount of voltage needed to operate the phase shifter. The phase shifter may be embedded as part of a microwave integrated circuit.
REFERENCES:
patent: 3466575 (1969-09-01), Chang
patent: 3631501 (1971-12-01), Buscher
patent: 3721923 (1973-03-01), Gray et al.
patent: 3944950 (1976-03-01), Jacobs et al.
patent: 4323901 (1982-04-01), De Wames et al.
patent: 4565982 (1986-01-01), Stern et al.
patent: 4757688 (1988-07-01), Basiulis et al.
patent: 4809011 (1989-02-01), Kunz
Elmer Frank J.
Jang Sei Joo
Kunz Kaiser S.
Anderson William H.
Ham Seung
LaRoche Eugene R.
The United States of America as represented by the Secretary of
Zelenka Michael
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