Effects on portable antennas of the presence of a person
作者： J. Toftgard , S.N. Hornsleth , J.B. Andersen
DOI: 10.1109/8.250451
关键词: Electrical engineering 、 Antenna (radio) 、 Acoustics 、 Physics 、 Link budget 、 Radiation pattern 、 Near and far field 、 Monopole antenna 、 Input impedance 、 Antenna efficiency 、 Telephone box
摘要: This work deals with the influence presence of a person has on performance antennas for hand-held portable telephones. It is shown how input impedance, far-field radiation pattern, efficiency, and magnitude near field are affected by human body. The investigations have been carried out applying finite-difference time-domain (FDTD) technique to model telephone lambda /4 monopole antenna simple hand-head operator. Results from this configuration compared results box alone. Measurements performed verify obtained simulations. show that shadow effect in pattern occurs direction including polarization, changes considerably impedance change resonance frequency when placed next person. efficiency close half energy absorbed hand head. On average system loss 3-4 dB should be included link budget, there considerable fading, even radio-anechoic chamber, persons move around natural manner. >
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