The complete surface current distribution in a normal-mode helical antenna using a Galerkin solution with orthogonal sinusoidal basis functions

2002 ◽  
Author(s):  
R.A. Abd-Alhameed
Keyword(s):  
Normal Mode ◽  
Current Distribution ◽  
Surface Current ◽  
Basis Functions ◽  
Surface Current Distribution ◽  
Helical Antenna ◽  
Complete Surface ◽  
Galerkin Solution

The current distribution on a circular disc

1985 ◽  
Vol 63 (4) ◽  
pp. 507-516 ◽  
Author(s):  
Gerhard Kristensson
Keyword(s):  
Current Distribution ◽  
Surface Current ◽  
Oblate Spheroid ◽  
Basis Functions ◽  
Circular Disc ◽  
Surface Currents ◽  
Surface Current Distribution ◽  
Surface Field ◽  
Plane Incident Wave ◽  
Spherical Basis

In this paper we derive the surface-current distribution on a perfectly conducting circular disc. The current is obtained by calculating the limit of the surface currents on an oblate spheroid as the thickness goes to zero. The null-field approach is used. We show that it is possible to calculate all quantities in terms of the spherical basis functions, thus avoiding the cumbersome spheroidal basis functions. Furthermore, it is shown that the correct edge behaviour appears very naturally within the formulation. We compute the surface field on the disc for a plane incident wave, the surface current (eigencurrents) at the complex resonances of the disc, and the induced current on a subterranean disc excited by a circular antenna loop on the ground.

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.

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