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We present an EPR instrument built for operation at Q band below 1K. Our cryogen-free Dewar integrates with a commercial electro-magnet and bridge. A description of the cryogenic and RF systems is given, along with the adaptations to the standard EPR experiment for operation at sub-Kelvin temperatures. As a first experiment, the EPR spectra of powdered Cr12O9(OH)3(O2CCMe3)15 were measured. The sub-Kelvin...
We present the designs for and the results of a prototype cryogenic Ka-band low noise amplifier (LNA), that is based on the hybridization of microwave integrated circuits (MICs) and monolithic microwave integrated circuits (MMICs). The resulting transistor plus MMIC (T+MMIC) 5 stage LNA, has a peak gain of 52dB, a minimum noise temperature of 12K at an ambient temperature of ≈23K, and a 20% bandwidth...
We present the designs for and the results of a prototype cryogenic Ka-band low noise amplifier (LNA), that is based on the hybridization of microwave integrated circuits (MICs) and monolithic microwave integrated circuits (MMICs). The resulting transistor plus MMIC (T+MMIC) 5 stage LNA, has a peak gain of 52dB, a minimum noise temperature of 12K at an ambient temperature of ≈23K, and a 20% bandwidth...
We present early results of noise temperature measurements made on a Planck LFI EBB Ka-band low noise amplifier at physical temperatures as low as 1.5 K. This temperature is an order of magnitude lower than typically used on radio astronomy receiver systems. The results are tentatively compared with semi-empirical predictions made by Pospieszalski.
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