Patent ID: 8421668

Claim:
A passive system for detecting a concealed object located on a subject in a target area and identifying material properties of the object, comprising: at least one antenna configured to receive an RF signal having a frequency of 100 GHz or greater and a bandwidth of 10 GHz or greater, the RF signal having been emitted by the object in the target area; a detector configured to convert the RF signal into an electrical signal; a signal integrator configured to integrate the electrical signal and provide an integrated signal over an observation period; a processor configured to: receive the integrated signal; create an image of the concealed object for each of a plurality of pre-defined frequency bands within the bandwidth, based on the received integrated signal; process each of the created images individually and collectively to determine the presence of the concealed object; create a spectral plot of the object; and compare the spectral plot of the object to pre-stored templates of material spectra to identify material properties of the object; and a display for providing an indication of the object and the identified material properties of the object.