FMCW and monopulse radar for heart beat and respiration monitoring

In this thesis, a dual mode radar that includes frequency modulated continuous wave mode and monopulse radar mode for heart beat and respiration monitoring is fabricated by combining active and passive processes. The active process used is TSMC 0.18 μm CMOS and the two passive processes used are low temperature co-fired ceramic (LTCC) and glass substrate integrated passive device (GIPD). We used flip-chip interconnects to combine the T18 chips and these two kinds of substrates.
This thesis analyzes the output signal, the received signal and the demodulated signal for the traditional FMCW monopulse radar system and the monopulse radar system with a single side band mixer. The effect of image rejection ratio of the single side band mixer in solving the null point problem in CW radar is also analyzed.
To compare and reduce the null point problem of the CW radar system, we adopted the traditional radar system and the radar system with a single side band mixer in transmitting path. Sigma and Delta signals are also obtained by using the monopulse radar structure in the receiver path. So, we can not only obtaining the speed and the distance of the target, but measuring the direction of the target.