Abstract
The concept of a fully superconducting integrated receiver isdeveloped and experimentally tested. This single-chip sub-mm wave receiverincludes a planar antenna integrated with a SIS mixer and an internalsuperconducting Josephson-type local oscillator (flux-flow oscillator, FFO).The receiver is tested with a DSB noise temperature below 100 K around 500 GHzbeing pumped by its internal local oscillator (LO). The instantaneousbandwidth of 15-20% is estimated via FTS and heterodyne measurements thatmeet the requirements of most practical applications. The far field antennabeam is measured as ≈f/10 with sidelobes below -16 dB thatis suitable for coupling to a real telescope antenna. A nine-pixel imagingarray receiver with each pixel containing an internally pumped receiver chipis developed and tested. A linewidth of the phase locked FFO as low as 1 Hz ismeasured relative to a reference oscillator in the frequency range270-440 GHz. An rf amplifier on the base of a dc SQUID is developed andtested showing a noise figure below 10 K at 4 GHz and a bandwidth of about300 MHz. This amplifier can be included as a part of an integrated receiverthat is valuable for array applications.
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