![]() ![]() ![]() ![]() In practice, it is the phase of the aperture fields that has much more of an influence on the far-field waveform, leading naturally to the concept of the phased-array antenna. When the phase and magnitude of the aperture fields can be specified without constraint, the possible far-field radiation spatial patterns are nearly boundless, subject only to diffraction limits 4, 5.Īperture antennas that generate and steer beams or other tailored patterns inherently make use of this Fourier relationship. Fourier optics then provides the quantitative connection between the spatial distribution of the aperture field and the angular distribution of the far-field. A common means of forming a desired radiation pattern is to specify the phase and amplitude of the field over an aperture. Electronic beamsteering is an essential capability for antennas used in Earth observation, radar, and communications 1– 7. ![]()
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