A Probe-Compensated Helicoidal NF-FF Transformation for Aperture Antennas Using a Prolate Spheroidal Expansion

<table>Dual horn, horizontal polarization, difference pattern. (a) amplitude of the aperture field distribution. (b) phase of the aperture field distribution.</table>

International Journal of Antennas and Propagation

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Figure 19

Figure 19: A Probe-Compensated Helicoidal NF-FF Transformation for Aperture Antennas Using a Prolate Spheroidal Expansion 