A high sensitive receiver for baseband pulse microwave radar sensor using hybrid technology

This paper describes an improved ultra-wideband (UWB) receiver for the receiving of ultra short electrical pulses transmitted by a short-range microwave radar. The receiver comprises an ultra-wideband balun operating in a frequency range of 600 MHz to 6 GHz and an integrated pulse sharpening circuit. The pulse sharpening circuit is driven by square-wave pulses with an amplitude of 1.5 V, a pulse width of 70 ps (FWHM), a rise time of 30 ps and a fall time of 80 ps. The receiver is realized in hybrid technology on CuClad substrate which makes it low cost and easy to integrate. The principle of operation of the receiver is based on the symmetry of the received input pulses leading to a high sensitivity and a dynamic range of 60 dB.