We have developed a 3-D high-resolution radar at 300 GHz with a cell resolution of 1 1.6 1.6 cm at a standoff distance of 8 m for security applications. The selection of an operating frequency of 300 GHz, a bandwidth of 27 GHz, and a field of view of 50 90 cm improves the through-clothes imaging of person-borne concealed objects. The radar's antenna design allows single-pixel imaging at a frame rate of two frames per second. A reduction in cost and power consumption and improvements in image quality are additional requirements taken into account in the design of this radar system.Index Terms-Continuous-wave linear-frequency modulation (CW-LFM), field of view (FoV), imaging radar, millimeter wave.

This paper presents a V^-band high-resolution radar sensor for short-range applications. Low-cost technologies have been properly selected in order to implement a versatile and easily scalable radar system. A large operational bandwidth of 9 GHz, required for obtaining high-range resolution, is attained by means of a frequency multiplication-based architecture. The system characterization to identify the performance-limiting stages and the subsequent design optimization are presented. The assessment of system performance for several representative applications has been carried out. Index Terms-Continuous-wave linear-frequency modulated (CW-LFM), high-resolution radar (HRR), micro-Doppler, millimeter wave, radar imaging. TABLE I OVERVIEW OF W-BAND RADAR SYSTEMS fc (GHz) Waveform Iluggard et al. L12J 94.0275 Sawtooth chirp Guldogan et al. [6] 77 Sawtooth chirp Brooker et al. [19] 94 Sawtooth chirp Rangwala et al. [20] 94.75 Sawtooth chirp Johannes et al. [3] 94 Sawtooth chirp Van Caekenberghe et al. [21] 94 OFDM Essen et al. [4] 94 Sawtooth chirp/SF Hantscher et al. [22] 97.5 Kapilevich et al. [23] 94 Sawtooth chirp Present system 100 Sawtooth chirp Gorka Rubio-Cidre received the B.Sc. degree in telecommunication systems engineering from the

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