| 摘要 |
<p>Control elements for RF antennas including high temperature superconducting capacitors (24) are formed. In one embodiment, a high temperature superconducting capacitor (24) is coupled to an inductor (22) to form a resonant circuit (20). In another embodiment a high temperature superconducting capacitor (32) is used to make a low-resistance cross-over (33) for an inductor (31). Additional circuits include circuits which do not use non-superconducting materials in the circuit, circuits which have coupled superconducting inductors (50, 51) for low-loss signal coupling, tuning and bandwidth broadening, and circuits which include switches to shut off the superconductivity of a superconductive element including low-loss photoconducting (70) and superconducting thermal (61) switches. These circuits are useful in Magnetic Resonance Imaging devices.</p> |
