A near-field measurement method and system for planar antennas with reduced truncation error
A planar antenna, truncation error technology, applied in the direction of the antenna radiation pattern, etc., can solve the problems of low efficiency, low near-field test efficiency, large scanning area, etc.
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[0053] A function whose Fourier transform is zero for frequency values outside the finite interval centered on the origin is called a band-limited function. When the function f(t) satisfies the band-limited condition, that is, when w>w c When , the frequency spectrum f(w)=0 of f(t), where w represents frequency, w c Indicates the boundary frequency of the function f(t). The extrapolation for band-limited function algorithm can recover f(t) from finite samples of f(t) in a given interval.
[0054] For planar near-field antenna measurements, the aperture field (aperturefield) is considered zero outside the aperture of the antenna under test, thus satisfying the band-limit condition. Therefore, the process of determining the plane wave spectrum from the finite field measured by the plane near-field antenna can be equivalent to a mathematical model of band-limited function extrapolation.
[0055] see figure 1 , which is a simplified model of a planar antenna. The antenna to...
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