Phase shift device using voltage-controllable dielectrics

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

H - Electricity

03

H

H03H 11/20 (2006.01) H01P 1/18 (2006.01)

Patent

CA 2114244

PHASE SHIFT DEVICE USING VOLTAGE-CONTROLLABLE DIELECTRICS ABSTRACT OF THE DISCLOSURE A length of strip transmission line uses two symmetri- cally 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 rela- tionship. 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.

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