Patents Assigned to Superconductor Technolgies Inc.
  • Patent number: 5488382
    Abstract: A detector for electromagnetic radiation includes a high Q, low loss antenna and a low noise amplifier requiring a high input impedance. In the preferred embodiment, the antenna comprises a low resistance, superconductive coil. The antenna forms a resonant circuit with a low loss capacitor, optionally a capacitor including superconductors. The output of the resonant circuit is provided as input to the semiconductor amplifier. In the preferred embodiment, junction FETs, preferably arranged in a cascode pair, are included in the semiconductor amplifier. In one aspect of the invention, feedback is provided from the output of the amplifier to its input. Effective loading of the antenna results, lowering the Q of the antenna, and broadening the bandwidth of the detector. Optimum matching of the antenna to the noise factor of the amplifier is achieved.
    Type: Grant
    Filed: May 10, 1995
    Date of Patent: January 30, 1996
    Assignee: Superconductor Technolgies Inc.
    Inventors: Neal O. Fenzi, Stephen I. Long