ELECTRICALLY CONTROLLED HTSC FERROELECTRIC COPLANAR

It is shown that in an integrated YBa2Cu3O7SrTiO3 structure coplanar w aveguide (CPW) electrical control of microwave propagation characteris tics is possible. Microwave losses of less than 0.2 dB/cm at 10 GHz ca n be achieved at liquid nitrogen temperatures, provided ferro-electric films with perfect crystalline structures are used. Electrically cont rolled changes in effective dielectric permittivity of more than 40% a re predicted at 77 K and 10 GHz. Sections of these CPWs can be used in electrically controlled phase shifters and resonators.