Wave transmission lines and networks – Coupling networks – Delay lines including long line elements
Patent
1995-01-31
1996-10-01
Lee, Benny
Wave transmission lines and networks
Coupling networks
Delay lines including long line elements
333164, H01P 118
Patent
active
055614078
ABSTRACT:
A phase shifter having a single or monolithic ferroelectric material and a lurality of ferroelectric transmission lines formed thereon, each having a different effective physical length and associated delay or phase shift. The plurality of different lengths of ferroelectric transmission lines has a voltage source associated therewith for applying a predetermined bias voltage, resulting in a change in permitivity in the ferroelectric substrate material. The different lengths of ferroelectric transmission line formed on the single substrate have a predetermined relationship between their effective physical linear lengths. By selectively activating the different lengths of ferroelectric transmission line by applying a bias voltage in different combinations, a desired or predetermined phase shift is obtained. The single or monolithic ferroelectric substrate used greatly reduces the overall length of the ferroelectric phase shifter. Additionally, less complex drive circuits are needed relative to analog type ferroelectric phase shifters.
REFERENCES:
patent: 4931753 (1990-06-01), Nelson et al.
patent: 5032805 (1991-07-01), Elmer et al.
patent: 5307033 (1994-04-01), Koscica et al.
patent: 5334958 (1994-08-01), Babbitt et al.
Babbitt Richard W.
Drach William C.
Koscica Thomas E.
Anderson William H.
Lee Benny
The United States of America as represented by the Secretary of
Zelenka Michael
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