r = µr
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Low Loss Magnetic Plate Application for Increasing Radiation Efficiency of Cellular Telephones
Eiji HANKUI Tatsuya NAKAMURA Osamu HASHIMOTO
IEICE TRANSACTIONS on Electronics Vol.E84-C No.6 pp.814-822
Publication Date: 2001/06/01
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
human phantom model, magnetic plate, cellular telephone, antenna performance, FDTD method,
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A low loss magnetic plate positioned near an antenna is proposed to increase radiation efficiency of cellular phones. This magnetic plate is used to control the nearby magnetic field around the cellular phone's antenna, and this field controlling is shown to be effective for the improvement of radiation efficiency and far-field pattern. As for the material design of the plate, a magnetic plate having high µr and low µr" (complex relative permeability: µr = µr - j µr") is found to be effective for achieving high performance. In our sample fabrication, a low loss magnetic sample with µr = 5.7 - j 0.7 at 900 MHz is realized. It is demonstrated that this low loss sample contributes to increased efficiency and improved far-field characteristics.