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Studies on SAR reduction using impedance mismatch loss for simple printed 5 GH z monopoles
Author(s) -
Lee ChengTse,
Su SaouWen
Publication year - 2015
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.29357
Subject(s) - specific absorption rate , return loss , antenna (radio) , reduction (mathematics) , microwave , electrical impedance , radiation pattern , physics , monopole antenna , near and far field , electrical engineering , engineering , materials science , optics , acoustics , telecommunications , geometry , mathematics
ABSTRACT A new approach to decreasing the specific absorption rate (SAR) for simple, printed monopoles in the 5‐GHz (5150–5825 MHz) WLAN band is presented. The antennas here are the conventional T‐shaped monopoles with a shorting strip located in between the top radiating arm and the antenna ground. The antenna was devised to be less matched (6 dB return loss) with 0.59 dB more insertion loss, yet the far‐field characteristics were slightly degraded and still met the industrial antenna specifications. It was found that the decreased near‐field radiation can be obtained, and the measured body SAR was substantially lowered by about 35–36% with an air gap of 2 mm directly from the antenna, which was provided by various input power. Details of the design approach and the results are discussed in the article. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2376–2384, 2015