77 GHz passive millimeter wave (PMMW) imaging camera for the purpose of security is developed. In order to detect
concealed objects in clothes without hindrance to flow of people at airport security checks, video rate imaging is realized
using one-dimensional imaging sensor array of 25 elements and a flapping reflector. As receiving antennas, novel
antipodal Fermi antenna (APFA) having required characteristics for passive imaging such as broad bandwidth to obtain
enough power, axially symmetric directivity with 10dB beam width of 35 degrees to obtain optimum coupling with
dielectric lens, narrow width geometry for high spatial resolution of imaging is used. Real-time calibration (RTC)
technique is introduced to eliminate the drift of receiving circuits. Interpolation technique to improve the quality of
image and marking software for screening of suspicious objects are also developed. High spatial resolution of 20 mm is
obtained by using developed imaging camera.
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