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We report the observation of negative group delay in a simple anisotropic cylindrical waveguide in the millimeter-wave region. With a 45° linearly polarized input, a relatively broad band of negative group delay was observed with 3.57% bandwidth, where the maximum group advancement achieved was about 24 times greater than the luminal delay, implying a fractional advancement of 13.32%. The peak advancement...
ISAR simulation of complex targets based on electromagnetic scattering field is significant to targets' stealth design, ISAR image interpretation and radar target recognition. In this paper, the high frequency approximation methods are applied to calculate the scattering field of complex targets, the theory of ISAR imaging based on electromagnetic scattering field is researched, and the principles...
Dynamic echo is the basis to analyze and discriminate the features of precession targets, but it is difficult to acquire the outfield data with small cost. In this paper, precession model of a general target is built, and the attitude formulas of elevation and azimuth are derived respectively. On the basis of the static electromagnetic scattering data, a scheme is proposed to simulate the dynamic...
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