Novel MIMO Antennas for Mobile Terminal

Radiation from a small device is dominated by the chassis, not only by the antenna structure attached to it. We propose a MIMO antenna system considering the mobile phone chassis as the main radiator. Since the chassis supports multiple orthogonal mode currents at a certain frequency, we couple to four of these modes using four miniature capacitive couplers to realize a four port antenna system. Although impedance characteristics of different modes are inherently different, matching at the system ports is sufficient to use this MIMO antenna system for 2.4 GHz ISM band.

[1]  Heinz J. Chaloupka,et al.  Multiple Antenna Concept based on Characteristic Modes of Mobile Phone Chassis , 2007 .

[2]  S.K. Chaudhury,et al.  MIMO antenna system based on orthogonality of the characteristic modes of a mobile device , 2007, 2007 2nd International ITG Conference on Antennas.

[3]  M. Cabedo-Fabres,et al.  Analysis of the coupled chassis-antenna modes in mobile handsets , 2004, IEEE Antennas and Propagation Society Symposium, 2004..

[4]  Werner L. Schroeder,et al.  Numerical analysis of characteristic modes on the chassis of mobile phones , 2006, 2006 First European Conference on Antennas and Propagation.

[5]  W. Stutzman,et al.  Spatial, polarization, and pattern diversity for wireless handheld terminals , 2001 .

[6]  T. Taga,et al.  Analysis for mean effective gain of mobile antennas in land mobile radio environments , 1990 .

[7]  R. Harrington,et al.  Theory of characteristic modes for conducting bodies , 1971 .

[8]  Helmut Bölcskei,et al.  An overview of MIMO communications - a key to gigabit wireless , 2004, Proceedings of the IEEE.

[9]  R. Garbacz,et al.  A generalized expansion for radiated and scattered fields , 1971 .

[10]  Mary Ann Ingram,et al.  Model development for the wideband expressway vehicle-to-vehicle 2.4 GHz channel , 2006, IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006..

[11]  F. Tufvesson,et al.  Car-to-car radio channel measurements at 5 GHz: Pathloss, power-delay profile, and delay-Doppler spectrum , 2007, 2007 4th International Symposium on Wireless Communication Systems.

[12]  Klaus I. Pedersen,et al.  Spatial channel characteristics in outdoor environments and their impact on BS antenna system performance , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).

[13]  Outi Kivekäs,et al.  Coupling element based mobile terminal antenna structures , 2006 .

[14]  P. Vainikainen,et al.  Resonator-based analysis of the combination of mobile handset antenna and chassis , 2002 .

[15]  J. Ollikainen,et al.  Optimal antenna placement for mobile terminals using characteristic mode analysis , 2006, 2006 First European Conference on Antennas and Propagation.

[16]  Jing Zhu,et al.  MAC for dedicated short range communications in intelligent transport system , 2003, IEEE Commun. Mag..