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Cascaded Rotman lens fed circular array

Cascaded Rotman lens fed circular array

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A single Rotman lens fed circular array requires phase shifters to beam steer, whereas a two-cascaded Rotman lens fed circular array can beam form and beam steer by simply exciting a single Rotman lens beam port. In this Letter, the authors show how cascaded Rotman lenses feeding a circular array can use this property in order to beam steer/shape and perform retrodirective action. Experimental validation at 9.3 GHz is given.

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