Ultracompact Retrodirective Antenna Arrays With Superdirective Radiation Patterns

Oleksandr Malyuskin, Vincent F. Fusco

Research output: Contribution to journalArticle

10 Citations (Scopus)
510 Downloads (Pure)


It is shown that the direction-of-arrival (DoA) information carried by an incident electromagnetic (EM) wave can be encoded into the evanescent near field of an electrically small resonance antenna array with a spatial rate higher than that of the incident field oscillation rate in free space. Phase conjugation of the received signal leads to the retrodirection of the near field in the antenna array environment, which in turn generates a retrodirected far-field beam toward the original DoA. This EM phenomenon enables electrically small retrodirective antenna arrays with superdirective, angular super-resolution, auto-pointing properties for an arbitrary DoA. A theoretical explanation of the phenomenon based on first principal observations is given and full-wave simulations demonstrate a realizability route for the proposed retrodirective terminal that is comprised of resonance dipole antenna elements. Specifically, it is shown that a three-element disk-loaded retrodirective dipole array with 0.15\lambda spacings can achieve a 3.4-dBi maximal gain, 3-dBi front-to-back ratio, and 13% return loss fractional bandwidth (at the 10-dB level). Then, it is demonstrated that the radiation gain of a three-element array can be improved to approximately 6 dBi at the expense of the return loss fractional bandwidth reduction (2%).
Original languageEnglish
Pages (from-to)2923 - 2935
Number of pages13
JournalIEEE Transactions on Antennas and Propagation
Issue number7
Early online date29 Apr 2016
Publication statusPublished - 05 Jul 2016

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