Communications: directive radio wave systems and devices (e.g. – With particular circuit
Patent
1997-02-13
1998-06-02
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
342204, 331107S, G01S 728
Patent
active
057607362
ABSTRACT:
X-band signals are generated from the output of a Josephson junction array which is excited by a first RF frequency waveform digitally implemented in a data stream generated by a digital waveform generator gated by a stabilized local oscillator operating at a second frequency (X-band). The Josephson junction array outputs a digital data stream having pulses of quantum mechanically accurate uniform amplitude and picosecond pulsewidth. These pulses are fed to a bandpass filter which operates to extract a low phase-noise RF signal at X-band and consisting of the sum of the first and second frequencies and which can thereafter be used to generate transmit signals in a radar system and more particularly a cryogenic radar system.
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"Fundamentals of Giaever and Josephson Tunneling", Y. Bruynseraede, C. Vlekken, C. Van Haesendonck and V.V. Moshchalkov, The New Superconducting Electronics, Kluwer Academic Publishers., pp. 1-28.
"Superconducting-Normal-Superconductor Junctions for Digital/Analog Converters", S.P. Benz, National Institute of Standards and Technology, Boulder, CO 80303.
"Josephson Voltage Standard -A Review", Clark A. Hamilton, Charles J. Burroughs and Samuel P. Benz, National Institute of Standards and Technology, Boulder, CO 80303.
Przybysz John Xavier
Smith, Jr. Thomas J.
Northrop Grumman Corporation
Sotomayor John B.
Sutcliff Walter G.
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