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IEEE Transactions on Antennas and Propagation
Volume 47 Number 5, May 1999

Scattering Matrix Integral Equation Analysis for the Design of a Waveguide Rotman Lens

Page 870.

Abstract:

An integral-equation-based procedure is developed for determining the scattering parameters of a multiport Rotman lens device. The device is intended for use at millimeter-wave frequencies and incorporates rectangular waveguide feeds. The integral equation model takes higher order modes in the feed apertures into account and incorporates mutual coupling between neighboring ports. A prototype lens was designed using the integral equation model and fabricated. The lens S-parameters were measured and modified with an ideal - 40 dB (n = 3) Taylor weighting function. The resulting beam sidelobe level is better than - 30 dB.

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