A 94-GHz receiver front end for passive millimeter-wave imaging

We have designed and fabricated the passive millimetre-wave imaging system for receiving radiation energy from the an object and a human body. The lens and front-end of the receiver are important in the system to detect input thermal noise signal. Passive millimetre-wave imaging system required of high sensitivity and wide broadband to detect input thermal noise. The LNA module of the imaging system has gain of 65.8 dB in average linear gain and 11 GHz in bandwidth to enhance sensitivity for thermal noise and to receive it in wide-band width as well. The zero-bias Schottky diode has been used for the detector circuit to convert amplified millimeter-wave signals to DC output.