Low noise amplifier

Details Low noise amplifier Low noise amplifier

1995-05-10

1996-01-30

Hajec, Donald T.

Communications: radio wave antennas

Antennas

Microstrip

343701, H01Q 126

Patent

active

054883822

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.

REFERENCES:
patent: 3827053 (1974-07-01), Willie et al.
patent: 4459595 (1984-07-01), Kramer et al.
patent: 4897662 (1990-01-01), Lee et al.
patent: 5171733 (1992-12-01), Hu
Walker et al, "Superconducting Superdirectional Antenna Arrays", IEEE Transactions on Antennas and Propagation vol. AP-25, No. 6, Nov. 1977, pp. 885-887.

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