Summary
International Symposium on Antennas and Propagation
2008
Session Number:2C12
Session:
Number:2C12-3
A Novel Central Symmetric MIMO Antenna Performance
Wei Ni, Nobuo Nakajima,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
It is well known that multiple-input multiple-output (MIMO) antennas can substantially increase the spectral efficiency of communication system. Fortunately, the correlation is low even if close separation. However, in practice the channel capacity could not be increased linearly as the number of antennas does at the mobile terminals due to the pronounced mutual coupling among them [1][4]. With the growing capabilities of the terminals, the antenna design is a great challenge for antenna engineers. Nowadays, the handset has typically the length between 80 and 100 mm, the width around 50 mm and the depth around 10 mm in 2.4 GHz band. It was found in previous research, which is battled with the dilemma, that the performance with antennas on separated ground plane is far better than those on co-ground plane, but the former is too massive to apply to portable phones. [2] Moreover, if 4 antennas are parallel mounted on the ground plane, the antenna spacing 6 ~ 12 mm is applicable for portable phones. It was also proved that the relatively high capacity could be provided even if the antenna spacing is small. The most important issue is that how to make the antenna structure small enough without loss of much capacity.