Theoretical Investigation of Blackbody Radiation for the Passive Millimeterwave Imaging System

In a passive millimeter wave imaging (PMMWI), there is no outgoing wave from the antenna of PMMWI system unlike the RAdio Detection And Ranging (RADAR). Antenna is only used to measure incoming waves which are coming from the all things because of being more than 0 Kelvin temperature or being non-blackbody. Radiation of the wall and the glass are different in a building; as a result, the PMMWI system can image the building with a good resolution to distinct the wall and glass. It can also image the gun that is under the cloth thanks to radiation difference. These systems utilize Planck, Wien and Rayleigh-Jeans Theories to view the images which are scanned in azimuth and elevation axis by PMMWI system through its antenna. In this work, the Planck, Wien and Rayleigh-Jeans Theories are analyzed and their formulas are run on MatLab Program with different temperatures for frequency or wave length at x-axis and for spectral radiance at y-axis.