Based on the study of radiation and transmission characteristics on THz waveband, a short-range passive detecting system
is designed. The scheme originated from microwave passive detecting system. A prototype was developed following the
design of key components including antennas and a harmonic mixer. The system operated at 0.36 THz. A dual-beam
Cassegrain antenna was adopted for receiving signals which radiated by object and background. Local oscillator signal was
generated by frequency multiplication. Harmonic mixing is adopted for reducing local oscillator signal frequency required
by half. Superheterodyne technology is employed for signal acquisition. The system implemented easily. Tests and
measurements were taken, which showed that the scheme was feasible and the performance of the prototype system met
the design requirements.
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