On 23 Dec 2006 09:43:54 -0800, "Rohit" wrote:

i m studying the distortion of the antenna pattern located near any
conductor. i want to know how do i interpret the patterns obtained. i
know the ideal pattern of the antenna but when i place them near any
conductor, can the pattern distortion be studied by knowing the surface
currents in the object due to the antenna? how the E field and H field
behaviour changes as it travels from free space to any finite conductor
plate?
i m very new to antennas so i need answer in detail to understand.
thanks
rohit

Hi Rohit,

An answer in detail is much too lengthy to present in one response.
The first consideration is the current amplitude and phase in the
antenna, the second consideration is the amplitude and phase in that
nearby conductor, and its distance to the antenna - the physical
distance is actually a third phase consideration.

The pattern is a combination of all amplitudes and phases as viewed
from an extreme (more than 100 wavelengths) distance.

73's
Richard Clark, KB7QHC