SAR Reduction with Antenna Cluster Technique

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An efficient and straightforward antenna design method is presented that maximizes the ratio of total efficiency and specific absorption rate (SAR). This goal is achieved with a multiport antenna cluster technique where several ports are excited collectively with appropriate feeding weights. These weights are found as an eigenvalue solution formulated in terms of the radiated and near-field power of an antenna. The method relies on both the near-field (SAR) and far-field (radiation) physics of an antenna and it can be applied to various design cases. The importance of the maximization of total-efficiency-SAR ratio and the feasibility of the proposed approach are demonstrated with a simple multiple-dipole antenna example and with a more realistic antenna design where a metal-rimmed antenna is held in the user's hand.

Original languageEnglish
Pages (from-to)12282 - 12287
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Issue number12
Early online date2022
Publication statusPublished - Dec 2022
MoE publication typeA1 Journal article-refereed


  • Antenna cluster
  • Antennas
  • Eigenvalues and eigenfunctions
  • Electric fields
  • mobile antenna
  • Mobile antennas
  • Optimization
  • Rayleigh quotient
  • Specific absorption rate
  • specific absorption rate
  • Surface impedance


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