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Characterization of terahertz antennas using photoinduced coded‐aperture imaging
Author(s) -
Shams M. I. B.,
Jiang Z.,
Qayyum J.,
Rahman S. M.,
Xing H.G.,
Hesler J. L.,
Fay P.,
Liu L.
Publication year - 2015
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.29051
Subject(s) - terahertz radiation , characterization (materials science) , optics , optoelectronics , materials science , physics
ABSTRACT We report a novel approach for characterization of terahertz (THz) antennas using the photoinduced coded‐aperture imaging (PI‐CAI) technique. For a prototype demonstration, a WR‐1.5 (500–750 GHz) diagonal horn antenna has been fully characterized. The THz beam radiated from the antenna was imaged using the PI‐CAI technique at different distances from the antenna aperture. The measured beam profiles show near‐Gaussian shapes, with the expected propagation properties. The far‐field antenna radiation patterns were then extracted from the far‐field beam image and compared with conventional measurement results, theoretical calculation and full‐wave simulation. Finally, the antenna Gaussian coupling efficiency was calculated to be ∼83% based on the two‐dimensional (2‐D) beam mapping technique. Antenna radiation parameters obtained using the above approach show good agreement with published literature and manufacturer datasheets, demonstrating the potential of the PI‐CAI approach for fast and accurate characterization of THz antennas. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1180–1184, 2015