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.
A High Sensitivity Full W-Band Radiometer with Temperature-Compensation Function
In this paper, a high sensitivity full W-band radiometer is demonstrated. The radiometer consists of a full W-band low-noise amplifier, a zero bias detector, a video amplifier and so on. To achieve high sensitivity, the minimum noise figure of the LNA is 2.8dB. And the gain is better than 20dB in full W-band. Meanwhile, a temperature-sensitive gate voltage compensation circuit is designed to fulfill the temperature-compensation function. Finally, the measurement results show the temperature sensitivity of all radiometers is better than 0.33K. And the thermal drift ratio is better than 15% between high and low temperature.
An optimized stepped profiled horn with low cross polarization for a 20/30 GHz DVB-RCS terminal
A smooth-walled horn is often preferred over a corrugated horn due to easier and cheaper manufacturing. By optimizing the profile of the horn it is possible to obtain low cross polarization over a broad bandwidth. In this paper a very efficient method of profile definition, analysis and optimization for a stepped profile horn is described and applied to the design of a 20/30 GHz feed horn suited for a satellite broadcasting system with return link (DVB-RCS). The horn design is manufactured by plastic injection molding and metallization, as part of an ESA project