It is shown that the Direction-of-Arrival (DoA)information carried by an incident electromagnetic wave can beencoded into the evanescent near field of an electrically smallantenna array with a spatial rate higher than that of the incidentfield oscillation rate in free space. Phase conjugation of thereceived signal leads to the retrodirection of the near field in theantenna array environment which in turn generates aretrodirected far-field beam towards the original DoA. Thiselectromagnetic phenomenon enables electrically smallretrodirective antenna arrays with superdirective, angular superresolution,auto-pointing properties for an arbitrary DoA.Theoretical explanation of the phenomenon based on firstprinciple observations is given and full-wave simulationsdemonstrate a realisability route for the proposed retrodirectiveterminal that is comprised of resonance dipole antenna elements.Specifically it is shown that a 3-element disk-loadedretrodirective dipole array with 0.15λ spacings can achieve3.4dBi maximal gain, 3dBi front-to-back ratio and 13% returnloss fractional bandwidth (at 10dB level). Next it is demonstratedthat the radiation gain of a 3-element array can be improved toapproximately 6dBi at expense of the return loss fractionalbandwidth reduction (2%).
Bibliographical noteFrom: firstname.lastname@example.org
To: email@example.com, firstname.lastname@example.org
Subject: Manuscript AP1509-1368.R1 has been accepted for publication
Dr. Oleksandr Malyuskin
ECIT, Queens University Belfast
United Kingdom of Great Britain and Northern Ireland
Paper No.: AP1509-1368.R1
Paper Title: Ultra-Compact Retrodirective Antenna Arrays with Superdirective Radiation Patterns
Dear Dr. Malyuskin,
It is my pleasure to inform you that the Editorial Board has recommended that your manuscript be published in the IEEE Transactions on Antennas and Propagation as a Paper.
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- Dipole antennas
- Antenna radiation patterns
- Directive antennas
- Phased arrays
- Receiving antennas