Phase shift device using voltage-controllable dielectrics

Details Phase shift device using voltage-controllable dielectrics Phase shift device using voltage-controllable dielectrics

1993-01-29

1994-10-11

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

333 26, 333139, H01P 118, H01P 308

Patent

active

053551044

ABSTRACT:
A length of strip transmission line uses two symmetrically spaced center conductors between two groundplanes. These conductive strips produce an even-mode electric field between the two groundplanes when excited in-phase and an odd-mode electric field when excited in anti-phase relationship. For the latter case, the phase velocity of the odd-mode is significantly affected by the electric field in the gap region between the conducting strips. By varying the relative dielectric constant of a material located in the gap region, e.g., by means of a voltage-controllable dielectric such as barium-titanate compositions, the phase velocity and, hence, the phase shift of an RF signal propagating through the strip transmission medium can be controlled.

REFERENCES:
patent: 3448410 (1969-06-01), Parks
patent: 4375054 (1983-02-01), Pavio
patent: 5032805 (1991-07-01), Elmer et al.
patent: 5075646 (1991-12-01), Morse
patent: 5212463 (1993-05-01), Babbitt et al.
Cohn, "Shielded Coupled-Strip Transmission Line", IEEE Trans. Microwave Theory Tech., MTT-3, pp. 29-38, Oct. 1955.
"A Broad-Band E-Plane 180.degree. Millimeter-Wave Balun (Transition)," R. W. Alm et al., IEEE Microwave and Guide Wave Letters, vol. 2, No. 11, Nov. 1992, pp. 425-427.

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