A wideband receiver-module for passive MM wave imaging array: Optimization and test results
Results of noise and impedance optimization of a W-band receiver-module are given. A wideband compact receiver-module for MM wave passive imaging array has been developed on the basis of InP MMIC LNA and a highly sensitive impedance matched low-barrier detector diode. Achieved bandwidth is 85–100 GHz, the gain factor is 30 dB that was sufficient to provide 15 mK/Hz1 temperature sensitivity of the receiver-module. Tests results of the receiver-module are presented.
Millimeter-Wave Detector on the Basis of Low-Barrier Schottky Diodes and a Planar Slot Antenna
Zero-bias detectors based on low-barrier Schottky diodes and planar slot antennas are investigated at 94 GHz. Diodes with differential contact resistances <i>R<sub>j</sub> </i>=1+1000 kOmega at zero bias are used. The better voltage responsivity - more than 10000 V/W - is obtained at <i>R<sub>j</sub> </i>=20+100 kOmega. At lower values of <i>R<sub>j</sub> </i>=2+6 kOmega a better noise equivalent power NEPap10<sup>-12</sup> WmiddotHz<sup>-1/2</sup>, is observed. Experimental data are compared with the simulation in a simple model of detector.
BEARS: SIS 25-beam array receiver system for the NRO 45-m telescope
A large focal plane array receiver system for the NRO 45 m telescope (SIS 25-BEam Array Receiver System, or BEARS) is described. This new array receiver uses SIS junctions and has 25 elements. It can operate at the frequency range of 82 - 116 GHz. The development of this new system is almost complete. We describe about the whole system in detail, which includes the receiver, the IF systems, the new spectrometers and the remote control systems. We also describe about the performances and the uniformity of the system and show the astronomical result.