Spherical Mode-Based Analysis of Wireless Power Transfer Between Two Antennas

Author

Yoon Goo Kim ; Sangwook Nam

Author_Institution

Dept. of Electr. & Comput. Eng., Seoul Nat. Univ., Seoul, South Korea

Volume

62

Issue

6

fYear

2014

fDate

Jun-14

Firstpage

3054

Lastpage

3063

Abstract

A method is presented to analyze the maximum power transfer efficiency of a wireless power transfer system and its electromagnetic fields via spherical modes. The Z-parameter and Y-parameter for two coupled antennas are derived using the antenna scattering matrix and an addition theorem. In addition, formulas for calculating the maximum power transfer efficiency and optimum load impedance are presented. A formula is derived to calculate the electromagnetic field generated by a wireless power transfer system from the antenna scattering matrix.

Keywords

S-matrix theory; antennas; electromagnetic coupling; electromagnetic fields; inductive power transmission; Y-parameter; Z-parameter; addition theorem; antenna scattering matrix; coupled antennas; electromagnetic fields; maximum power transfer efficiency; optimum load impedance; spherical mode-based analysis; wireless power transfer system; Antenna feeds; Electromagnetic fields; Equations; Impedance; Scattering; Wireless communication; Addition theorem; antenna mutual coupling; spherical mode; wireless power transfer;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2014.2312419

Filename

6775290