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Effects of using conductive materials for SAR reduction in mobile phones
Author(s) -
Chan K. H.,
Chow K. M.,
Fung L. C.,
Leung S. W.
Publication year - 2004
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.20569
Subject(s) - specific absorption rate , mobile phone , reduction (mathematics) , antenna (radio) , microwave , electrical conductor , electromagnetic shielding , electrical engineering , engineering , computer science , telecommunications , geometry , mathematics
Adding an external shield to mobile phones is one of the common methods adopted for the reduction of the specific absorption rate (SAR), which is the safety level of human exposure to radiated electromagnetic fields from mobile phones. This paper provides an experimental study on the effectiveness of SAR reduction by attaching conductive materials to mobile phones, and the corresponding effects of the antenna performance of the mobile phones. The results show a typical trade‐off of a 20% reduction in the SAR value with a maximum 1.8‐dB reduction in the received power of the antenna. The results also conclude that the attachment position of the shielding material is an important factor, whereby the hot spot of the SAR distribution of the mobile phone must be well covered in order to achieve good SAR reduction. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 140–144, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20569