Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TF1
Session:
Number:3TF1-2
Evaluation on Input Characteristics of MIMO Antenna for Mobile Terminal Gripped by Human Hand
Takumi Hiraoka, Kazuyuki Saito, Masaharu Takahashi, Koichi Ito, Yoshiaki Amano, Masayuki Nakano, Hiroyasu Ishikawa,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
In recent years, next generation systems have been actively studied to realize high speed and capacity data communication within mobile environments. MIMO (Multiple-Input MultipleOutput) systems are well known as a transmission technology that improves the quality of wireless links and enhances the system capacity within the limitary frequency band. This is because these systems with multiple antennas on the transmitter and receiver can perform parallel transmission at the same time and frequency by taking advantage of multi-path environment [1, 2]. In general, the characteristics of the antenna are influenced by a body of user. Recent studies showed that the presence of the hand in vicinity of mobile phones has more effects on the antenna performances rather than head [3, 4]. In the actual situations, the characteristics of MIMO antennas are also easily affected by the human hand [5]. However, relatively few studies have taken into account the influence of the human hand for evaluating the performance of MIMO antennas. In this report, the interaction between IFA (Inverted F antenna) elements of a MIMO antenna for a MIMO terminal and a human hand is investigated by using an FDTD (Finite Difference Time Domain) calculation and measurement. The input characteristics which are reflection coefficients of the MIMO antenna gripped by hand model are calculated and measured when changing the distance between MIMO antenna and the human hand model.