Experimental Study of Electrically Compact Retrodirective Monopole Antenna Arrays

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Auto -pointing and angular super -resolution properties of the radiation patterns generated by an electrically compact retrodirective monopole antenna array are demonstrated experimentally for the first time. The operation of electrically compact (element spacings less than one fifth of the radiation wavelength) retrodirective antenna arrays that were theoretically considered in our previous work are confirmed by measurement. Particularly it is shown that the Direction -ofArrival (DoA) information carried by an incident electromagnetic wave can be encoded into the evanescent near field of an electrically small resonant antenna array with a spatial rate higher than the spatial oscillation rate of the incident field in free space. This observation is supported by the near field measurements demonstrating that the magnitude of the scattered (evanescent) field in the array environment can exceed the magnitude of the incident field in free space by at least 6dB. Retrodirective array antenna matching and the feasibility of a frequency -division full -duplex communication link based on the proposed antenna arrays are also discussed.
Original languageEnglish
Pages (from-to)2339-2347
Number of pages9
JournalIEEE Transactions on Antennas and Propagation
Early online date17 Mar 2017
Publication statusPublished - May 2017


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