Reporting the Progress of the Joint Technical Actions Antenna/wire coupling in the near field A. Rubinstein EMC Group Swiss Federal Institute of Technology

The Problem 150 Ω5 cm 1 m ground plane

The Problem 150 Ω

The Problem 150 Ω

The Problem 150 Ω 30, 80 cm

The Problem 150 Ω 30, 80 cm

The Problem 150 Ω

The Problem 150 Ω

The Problem 150 Ω 5, 10 m

The Problem 150 Ω Infinite ground plane

Results using NEC

Finite ground plane About segments 8 minutes per iteration using 16 processors on a supercomputer!!!!!

Results using NEC

Three different polarizations

Three different heights Antenna moves vertically with wire

Three different heights, antenna fixed at original height

Conclusions Must use infinite ground plane with NEC. In this case, simulations take under 1 sec per iteration Post processing with NEC is long and hard The fact of changing the height of the wire produces changes that cannot be isolated from the fact that the connector to the ground becomes an important coupling device Results comparable to those obtained by the other partners