Doppler modules are used for various applications like intrusion alarm, traffic radar etc. At higher frequencies, better velocity resolution and higher gain are obtained whet '; at lower frequencies the beam is formed at a shot distance (1) 2d2/71 ; d - antenna aperture length, - wave Igth). Also at higher frequencies, atmospherk and rain attenuations are higher. One has to compromise various parameters for a specific application. This paper describes the system design of mm-wave doppler module for intrusion alarm application - and present experimental data.
S. S. Prasad,
"Mm-wave doppler module", Proc. SPIE 2250, International Conference on Millimeter and Submillimeter Waves and Applications 1994, 22505N (1 January 1994); doi: 10.1117/12.2303220; https://doi.org/10.1117/12.2303220