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Analysis of coupling between digital signal on FPCB and mobile handset antenna
Author(s) -
Kim Joonchul,
Kim Hyeongdong
Publication year - 2011
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.26292
Subject(s) - handset , electrical engineering , antenna (radio) , engineering , signal (programming language) , harmonics , coupling (piping) , electronic engineering , microwave , radio frequency , sensitivity (control systems) , telecommunications , voltage , computer science , mechanical engineering , programming language
Digital harmonics, which may reduce the radio frequency (RF) sensitivity of a system, can be coupled with an antenna in a mobile handset. Especially, the digital signals which flows a flexible printed circuit board (FPCB) can be coupled with an antenna and which seriously degrade the system sensitivity. This article explores the coupling mechanisms of digital harmonics on an FPCB with an antenna in terms of the characteristic mode current and the concept of reaction. The signal and ground lines in an FPCB are modeled as a loop path exciting a characteristic mode current, and the mechanisms of the coupling between the digital signal and the antenna port are analyzed. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2318–2321, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26292