A re-radiating zone plate antennae system
Klein, Martin Leroy
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In this paper we are concerned with the possibility of improving the field strength of a radiated electromagnetic disturbance. The disturbance is propagated by an antenna of short length which is excited by a signal of purely arbitrary wave form. In an effort to improve the distribution in space of the radiated signal, a secondary re-radiating antenna is introduced into the field of the primary short antenna. This secondary antenna is of special design • Use is made of Fresnel's zone plate from the physical optics. The Fresnel zone plate is a series of concentric circular rings of varying area, each area alternately transparent and opaque. The result in optics is the strengthening of light intensity at certain points in space at the expense of other points. The mathematical representation of this new distribution of light energy is well known. We hope to make use of the electromagnetic analogue of the zone plate, but instead of making use of geometric concepts only, make a rigorous mathematical definition of the new field distribution in space. This is done with the help of the well known Maxwell Equations. [TRUNCATED]
Thesis (Ph.D.)--Boston University
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