Monostatic Reflectivity and Transmittance of Radar Absorbing Materials at 650 GHz
ABSTRACT Transmittance and monostatic reflectivity of different radar absorbing materials at 650 GHz are presented. The reflectivity was measured in plane-wave conditions in a radar cross-section (RCS) range with vertical polarization. The lowest reflectivity level (-70 dB) was achieved with commercial absorbers TK THz RAM and Firam-500 with oblique incidence angles. Floor carpets were also studied, and the reflectivity level of those was found to be sufficiently low (from -50 to -60 dB) for use in antenna test ranges. Results agree with earlier studies and indicate the applicability of the RCS method in reflectivity measurements also at 650 GHz.
Article: THz Metrology and Instrumentation[Show abstract] [Hide abstract]
ABSTRACT: This paper gives an overview of measurement techniques used in the THz region of the electromagnetic spectrum, from about 100 GHz to several THz. Currently available components necessary for THz metrology, such as sources, detectors and passives, are briefly described. A discussion of power measurements, vector network analysis and antenna measurements as well as the limitations of these measurements at THz frequencies is given. The paper concludes with a summary of available components and instrumentation for THz metrology at the time of writing.Terahertz Science and Technology, IEEE Transactions on. 01/2011; 1(1):133-144.
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ABSTRACT: A hologram-based compact antenna test range (CATR) is designed, constructed, and used to test a 1.5-m antenna at 650 GHz. The CATR is based on a 3.16-m-diameter hologram as the collimating element. So far, this is the highest frequency at which any CATR has been used for antenna tests. The quiet zone is measured and optimized before the antenna tests. The measured antenna pattern results at 650 GHz are analyzed and compared to the simulated patterns. Feed scanning antenna pattern comparison technique is used to correct the antenna pattern. These tests show the hologram CATR to be promising for antenna measurements up to 650 GHz.IEEE Transactions on Antennas and Propagation 04/2009; · 2.33 Impact Factor