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We present an experimental demonstration of three-dimensional terahertz radar based on multi-directional leaky-wave scanning. The radar consists of a leaky-wave antenna that allows for one-dimensional beam steering by sweeping frequency around 300 GHz. The 3D positions of objects placed in front of the antenna can be reconstructed by synthesizing radar signals acquired at various azimuthal angles...
A dual-band millimeter-wave cloud radar is studied in this paper. Firstly, the available frequencies for the dual-band operation are analyzed, including several atmospheric window, such as 94 GHz, 140 GHz and 220 GHz. Then, the equivalent radar cross section of the particles in cloud are studied, which is dependent on the particle' size and available frequencies. Based on the above analysis, 94 GHz...
In this paper, a patch antenna designed to operate in a UHF passive radar with a broadband about 19% is validated in a real semi-urban scenario. Novel techniques, such as using air gap as substrate and E shaped patch, were considered in the fabrication. The proposed solution is used in the surveillance acquisition system of IDEPAR demonstrator, a DVB-T based passive radar system, to evaluate the detection...
The W-band signal near the antenna surface is detected using a THz probing system, by assuming near/far electric field distribution measurement on a phased array antenna coupled to an RoF radar system. By using 10 GHz + 12.5 kHz optical sampling pulse with a ZnTe EO probing head, the 80-GHz signal generated by a UTC-PD could be successfully detected as a down-converted signal of 100 kHz. It suggests...
Detection of small foreign object debris (FOD) on airport runways is important to prevent accidents. In this study, an FOD detection system that utilizes optically-connected 96 GHz millimeter-wave radar has been developed. This detection system uses Radio-over-Fiber signal transmission between a signal source and several radar antenna units. Further, field evaluations of the developed radar system...
A circularly polarized antenna array for the automotive radar frequency band at a center frequency of 79.5 GHz is proposed. The antenna array consists of 10 dual-linearly polarized square microstrip patch elements in 50 Ω series-feed configuration. Amplitude tapering is applied in order to reduce the sidelobe level. The antenna array is fed from a WR10 rectangular waveguide and a transition which...
Spaceborne cloud radar is an active remote sensing instrument. It can achieve all-day, all-weather continuous observations of global cloud vertical structure and cloud liquid water, ice water content. Compared to the current millimeter-wave cloud radar, terahertz cloud radar has a shorter wavelength which is closer to the cloud droplet particle size, and thus it has a higher sensitivity. The improved...
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