Rotman lens based-retrodirective array

Robert Cahill, Vincent Fusco, Neil Mitchell, S. Christie, G. Maxwell-Cox, Y. Munro, Neil Buchanan

Research output: Contribution to journalArticle

23 Citations (Scopus)


A new type of broadband retrodirective array, which has been constructed using a microstrip Rotman lens, is presented. Automatic tracking of targets is obtained by exploiting the conjugate phase response of the beamforming network which is exhibited when the input ports are terminated with either open or short circuits. In addition, the true time-delay property of the Rotman lens gives broadband operation of the self-tracking array when used in conjunction with Vivaldi antennas. The simulated and measured bistatic and monostatic radar cross-section (RCS) patterns of a structure consisting of 13 beamports and 12 array ports are presented at frequencies in the range 8-12 GHz. Significantly enhanced RCS within the scan coverage ±40° is demonstrated by comparing the retrodirective behavior of a 12-element Vivaldi array terminated with and without the Rotman lens. © 2006 IEEE.
Original languageEnglish
Article number6107525
Pages (from-to)1342-1351
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Issue number3
Publication statusPublished - Mar 2012

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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