A matrix-free spectral rotation approach to the computation of electromagnetic fields generated by a surface current distribution

2005 ◽  
Vol 4 ◽  
pp. 121-124 ◽  
Author(s):  
G. Tiberi ◽  
S. Rosace ◽  
A. Monorchio ◽  
G. Manara ◽  
R. Mittra
Keyword(s):  
Electromagnetic Fields ◽  
Current Distribution ◽  
Surface Current ◽  
Surface Current Distribution ◽  
Matrix Free

scholarly journals Computation of antenna pattern correlation and MIMO performance by means of surface current distribution and\\ spherical wave theory

2006 ◽  
Vol 4 ◽  
pp. 33-39 ◽  
Author(s):  
O. Klemp ◽  
G. Armbrecht ◽  
H. Eul
Keyword(s):  
Channel Capacity ◽  
Current Distribution ◽  
Spherical Wave ◽  
Surface Current ◽  
Wave Theory ◽  
Antenna Pattern ◽  
Mimo Channel ◽  
Computational Technique ◽  
Surface Current Distribution ◽  
Pattern Correlation

Abstract. In order to satisfy the stringent demand for an accurate prediction of MIMO channel capacity and diversity performance in wireless communications, more effective and suitable models that account for real antenna radiation behavior have to be taken into account. One of the main challenges is the accurate modeling of antenna correlation that is directly related to the amount of channel capacity or diversity gain which might be achieved in multi element antenna configurations. Therefore spherical wave theory in electromagnetics is a well known technique to express antenna far fields by means of a compact field expansion with a reduced number of unknowns that was recently applied to derive an analytical approach in the computation of antenna pattern correlation. In this paper we present a novel and efficient computational technique to determine antenna pattern correlation based on the evaluation of the surface current distribution by means of a spherical mode expansion.

scholarly journals Spherical mode analysis of planar frequency-independent multi-arm antennas based on its surface current distribution

2006 ◽  
Vol 4 ◽  
pp. 25-32 ◽  
Author(s):  
G. Armbrecht ◽  
O. Klemp ◽  
H. Eul
Keyword(s):  
Current Distribution ◽  
High Speed ◽  
Near Field ◽  
Multiple Input Multiple Output ◽  
Data Communication ◽  
Surface Current ◽  
Mode Analysis ◽  
Surface Current Distribution ◽  
Diversity Techniques ◽  
Input Multiple Output

Abstract. Deployment in the design of mobile radio terminals focuses on the implementation of multiradio transmission systems, using a multiplicity of different radio standards combined with high-speed data communication over multiple-input multiple-output (MIMO) and multimode diversity techniques. Hence, planar log.-per. four-arm antennas are predistined to meet the requirements of future mobile multiradio RF-frontends and will be introduced and analysed in terms of an efficient spherical mode analysis by means of surface current distribution in order to derive an analytic access to MIMO- and polarisation-diversity performance computation. A remarkable parameter reduction and a faster numerical analysis with respect to conventional techniques may be achieved. The sources in the near-field antenna region are based on the numerical computation of surface currents involving the finite element method (FEM). Relations between the variations of the geometrical antenna parameters and the excitation of discrete spherical modes are presented and will be analysed in detail.

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