Optimal antenna placement for mobile terminals using characteristic mode analysis

Author

Rahola, Jussi ; Ollikainen, Jani

Author_Institution

Nokia Res. Center, Nokia

fYear

2006

fDate

6-10 Nov. 2006

Firstpage

1

Lastpage

6

Abstract

When an electrically small antenna element is placed on a small finite ground plane, as in mobile terminals, the ground plane resonances strongly affect the impedance and radiation characteristics of the antenna system. In this paper, we show how characteristic mode analysis can predict the optimal locations of antennas on finite ground planes. As patch-type antennas couple to the ground plane resonances mainly through the electric field, it is natural that the strongest coupling and thus the maximum impedance bandwidth is obtained when the antenna element is placed at the maximum of the electric field of a ground plane mode. This is verified by moving a small probe antenna at selected locations over a rectangular 100 mm by 40 mm ground plane and by computing the obtainable bandwidth at each point.

Keywords

antenna radiation patterns; cavity resonators; mobile antennas; telecommunication terminals; characteristic mode analysis; ground plane resonances; mobile terminals; optimal antenna placement; patch-type antennas; Antenna feeds; Antenna theory; Bandwidth; Frequency estimation; Impedance; Mobile antennas; Mobile handsets; Probes; Resonance; Resonant frequency; antenna placement; characteristic mode analysis; mobile terminal antennas; small antennas;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation, 2006. EuCAP 2006. First European Conference on

Conference_Location

Nice

Print_ISBN

978-92-9092-937-6

Type

conf

DOI

10.1109/EUCAP.2006.4584657

Filename

4584657