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  • 1
    Electronic Resource
    Electronic Resource
    Radiation from a dielectric disk near a lossy dielectric plane (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3390-3396 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We calculate how the radiation pattern, the quality factor Q, and the resonant frequency of a dielectric disk resonator are altered from that of free space when the resonator is brought in close proximity to a lossy dielectric plane. The calculations are compared with measurements performed at frequencies near 10.4 GHz on a sapphire disk resonator that is within a wavelength of a copper backplane. As the resonator approaches the backplane, the resonant frequency increases and the radiated power is suppressed, enhancing the Q of the resonance by a factor Qe. Experimentally, the Q of the resonator is enhanced by an optimum value of 4.5 when the midplane of the disk is about 0.5 cm above the copper backplane. Here the resonant frequency is shifted to 10.45 GHz. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361385
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  • 2
    Electronic Resource
    Electronic Resource
    Cryogenic motorized waveguide switch (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 894-895 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Simple modifications to a commercially available motorized waveguide switch are described which allow the operation of the switch at both room temperature and cryogenic temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139599
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  • 3
    Electronic Resource
    Electronic Resource
    A low-noise series-array Josephson junction parametric amplifier (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3078-3080 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have obtained parametric gain at 19 GHz from a distributed Josephson junction parametric amplifier whose active gain medium consists of a series array of 1000 Josephson junctions embedded in a coplanar waveguide. When cooled to 1.7 K the amplifier provides 16 dB gain in a mode where the internally generated double sideband noise referred to input is 0.5±0.1 K. This noise is consistent with Nyquist noise generated from the losses. An instantaneous bandwidth of 125 MHz has been observed with a peak gain of 12 dB. The 3 dB compression point with a peak gain of 14.6 dB is -90.5 dB and the dynamic range is 38 dB. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116845
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