Fecha de publicación: 09/06/1994 Fuente: WIPO "miel" The disclosure relates to ferroelectric and superconducting thin films used in combination to produce low-loss frequency tunable microwave and mm-wave devices. Various metal oxide superconducting and ferroelectric films can be arranged in numerous multilayered geometries (figs. 14-19) which can effect microwave and mm-wave signals through the application of a voltage (V) across the ferroelectric film. A preferred embodiment of the invention (figs 1, 2) is the use of the inventive device as a phase shifter or delay line (20) utilizing voltage tunable capacitor structures (21, 23) fabricated from ferroelectric thin films (22) which are responsive to a voltage bias (25). Additional microwave, and mm-wave embodiments include resonators (figs 10, 11), filters, coplanar waveguides, phase array antennas (fig. 6), radiative gratings (fig. 7), electrically small antennas (fig. 8), half loop antennas (figs. 23, 24), fringe effect capacitors (figs. 12, 13, 21, 30, 31), artificial transmission lines (fig. 29), etc.