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A novel approach to reduce the near field electromagnetic scattering for designing HAC compatible mobile phones
Author(s) -
Zhao Anping,
Ollikainen Jani,
Thaysen Jesper,
Bodvarsson Thorvaldur
Publication year - 2010
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.25026
Subject(s) - engineering , mobile phone , inductor , electromagnetic compatibility , printed circuit board , electrical engineering , microwave , scattering , hinge , electromagnetic field , electronic engineering , telecommunications , physics , mechanical engineering , optics , quantum mechanics , voltage
By splitting the upper printed wiring board (PWB) of a fold mobile phone into two parts and connected with an inductor, the near field electromagnetic scattering of mobile phones can be significantly reduced. In fact, the gap between the split PWB tends to act as a capacitor. Hence, the gap and the inductor form an LC band‐stop filter embedded in the PWB. With the help of this filter, the current flowing on the PWB can be constrained before it reaches the end of the PWB, which results in less electromagnetic field scattering in the hearing aid compatibility (HAC) region, and thus, leads to an HAC compatible mobile phone design. The design principle works well for fold phones with both one‐hinge and two‐hinge cases. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 709–715, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25026