Fuhong Guan

SIGNAL MODEL ANALYSIS OF A 35GHZ ALTERNATING CURRENT DIRECT DETECTION RECEIVER

A 35 GHz alternating current (AC) direct detection receiver for passive imaging has been studied and presented. The Monolithic Microwave Integrated Circuits (MMIC) Low Noise Amplifiers (LNAs) with high gain and wide band are cascaded to provide enough gain for high sensitivity in the receiver. On basic of discussing the structure and mechanical chopping modulation, the signal model and compensation mechanism is emphatically analyzed. Finally, the imaging result is given.

Illumination method for millimeter wave imaging indoors

This paper presents an effective illumination method for millimeter wave imaging indoors based on multi-phase diversity principle. Though limited to its ability to do the image recognition accurately, it still gives a good performance for millimeter wave imaging idoors. The results from a real-time indoor millimeter wave imaging are presented, clearly showing the hidden metal objects.

A Ka-band high sensibility wideband millimeter wave receiver used for imaging application

A high sensibility wideband millimeter wave receiver operating in Ka band on the background of imaging concealed objects is presented. The zero-bias direct detecting millimeter receiver achieves an effective bandwidth 7.6 GHz and NF <3dB which can receive like noise signals that are typical for passive mm-wave imaging. The fundamentals of the system are described. The principle of operation, performance of the receiver and supporting measured date are described. Examples of images built with this receiver using a mechanically scanned system are presented proving its applicability for imaging application.