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We report a novel approach using terahertz (THz) photo-induced coded-aperture imaging (PI-CAI) technique to characterize a WR-1.5 (500–750 GHz) diagonal horn antenna at 590 GHz. The measured antenna beam profiles show decent Gaussian shape and propagation properties, as expected. Antenna far-field radiation patterns extracted from beam images agree well with theory and simulation. On the basis of...
To continue and improve the earlier studies by different authors [1-4], in 2011 the BIPM launched a pilot study on the accurate calibration for the UTC time links [5]. The goal is to unify the UTC time link calibration uncertainties ≤ 2 ns. This is attainable with the ‘one for all’ METODE scheme and a dedicatedly designed travelling calibrator (StdB). The METODE calibration result (CM) can be easily...
The calibration uncertainty (uB) is the dominant part in the total uncertainty budget of the UTC generation [1,3]. There are two calibration strategies: (a) Receiver calibration and (b) Time link calibration. The state-of-the-art [1,4,5] of the uB is of order 5 ns for GNSS time transfer based on the strategy (a) and is 1 ns for TWSTFT based on the strategy (b) in which the absolute offset is canceled...
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