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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.

References

    1. 1)
      • 1. Simon, A.P.S.: ‘Analysis and synthesis of Rotman lenses’. 22nd AIAA Int. Communications Satellite Systems Conf. & Exhibit 2004, Monterey, California, 9–12 May 2004.
    2. 2)
      • 2. Rausch, E.O., Peterson, A.F.: ‘Rotman lens design issues’. 2005 IEEE Antennas and Propagation Society Int. Symp., Washington, DC, USA, July 2005, pp. 3538.
    3. 3)
    4. 4)
      • 4. Davies, D.E.N., McCartney, B.S.: ‘Cylindrical arrays with electronic beam scanning’, Proc. IEEE, 1965, 112, (3), pp. 497505.
    5. 5)
    6. 6)
    7. 7)
      • 7. Coleman, H.P.: ‘Multiple beam retrodirective array with circular symmetry’. U.S. Patent US3736592, 29 May 1973.
    8. 8)
      • 8. Van Atta, L.C.: ‘Electromagnetic reflector’. US Patent 2,908,002, 8 June 1955.
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