Fundamental Aspects of Near-Field Coupling Small Antennas for Wireless Power Transfer

A physical limitation on the power transfer efficiency between two electrically small antennas in the near-field range is presented. By using a Z-parameter which describes the interaction between two antennas for spherical modes in connection with antenna parameters, the maximum power transfer effic...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2010-11, Vol.58 (11), p.3442-3449
Main Authors: LEE, Jaechun, NAM, Sangwook
Format: Article
Language:English
Subjects:
Antenna efficiency
Antenna theory
Antennas
Applied sciences
Couplings
Electromagnetic coupling
Exact sciences and technology
Helical antennas
Impedance
Joining
Joints
Loaded antennas
near fields
Optimization
Power transfer
Radiocommunications
Scattering parameters
Simulation
Telecommunications
Telecommunications and information theory
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Summary:A physical limitation on the power transfer efficiency between two electrically small antennas in the near-field range is presented. By using a Z-parameter which describes the interaction between two antennas for spherical modes in connection with antenna parameters, the maximum power transfer efficiency and the optimum load impedance are shown as functions of the distance between two antennas, the radiation efficiency and the input impedance of the isolated antenna. The theory is verified by a simulation with a small helical antenna, which generates and modes, simultaneously.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2010.2071330