Abstract
In the paper diffraction theory is applied to obtain the field received by an aperture in the parallel-plate region of a Rotman lens when the outer arc of the lens is excited with arbitrary phase and amplitude distributions. It has been found that the receiving aperture does not detect the maximum power when it is located upon the nominal focus, it is shown that the peak power position depends on the wavelength and it moves in the radial direction. The theory has been applied to predict the power received by the focal arc apertures of a Rotman lens and satisfactory agreement between theory and experiment has been found.
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