Authors: Henok Tadesse
1. According to Huygens’ principle every point on the wave front becomes a source of a spherical wave. The sum of these secondary waves determines the form of the wave at any subsequent time. These secondary waves are assumed to travel only in the forward direction. According to the new theory proposed in this paper, however, these secondary waves are not spherical waves: their radiation pattern is the replica of the radiation pattern of the source of the wave . Thus if we put an obstacle between a radiating element and a point in space so that there is no direct propagation from the radiating element to that point, the amount of electromagnetic radiation received through diffraction at that point from the edge of the obstacle depends on the radiation pattern of the source. If the radiating element radiates very small power in the corresponding general direction, less EM waves will be received at that point than if it radiates much power in that corresponding direction. 2. According to our knowledge so far diffraction depends on frequency; lower frequencies are diffracted more than higher frequencies. According to the new theory proposed in this paper, however, diffraction directly depends on the radiation pattern of the source and hence of the radiation pattern of each point on the wave front. If we constructed an antenna for low frequency with the same sharp radiation pattern as an antenna for a very high frequency and tested diffraction, we would prove that diffraction is independent of frequency, according to the theory proposed in this paper. 3. According to our knowledge so far electromagnetic waves propagate in straight line in free space. According to the new theory presented in this paper, however, only radiation from a perfectly isotropic radiator travels in straight path! Therefore electromagnetic radiations from practical radiators such as an antenna are never isotropic, so electromagnetic waves radiated from these always propagates in spiral path around the source, in cosmic scales. Each tiny angular portion of the wave follows a different spiral path which directly depends on the gradient of intensity with respect to angle at that point, which in turn depends on the angular position in the radiation pattern. Natural sources of light (the sun and the stars) are nearly perfect isotropic radiators, so light from them should travel in straight path. We consider the sun and the stars as a single source and not the individual radiating atoms inside them.
Comments: 6 Pages.
[v1] 2012-11-03 14:19:04
Unique-IP document downloads: 279 times
Add your own feedback and questions here:
You are equally welcome to be positive or negative about any paper but please be polite. If you are being critical you must mention at least one specific error, otherwise your comment will be deleted as unhelpful.