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.
Spline-Profile Horn for Array Applications in Radio Astronomy
In this paper the properties of an optimized compact smooth-walled spline-profile horn for the 30 38 ÷ GHz frequency band is described. The measured 3 dB beamwidths are 40° in the H-plane, 37° in the E-plane, and 38° in the 45° -plane. The measured sidelobe levels are less than –30 dB in H-plane, –23 dB in E-plane, and –25 dB in 45° -plane. The maximum gain is 13.8 dBi. The measured crosspolarization level is less than –20 dB at the top of the band. The antenna measurement and test results are in good agreement with simulation. The results of the trial observations at the RATAN-600 radio telescope with the horn are given. We consider using such a horn as an efficient element in a multi-beam receiving array for a radio telescope.
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