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Some applications of Gaussian beam theory in reflector antenna design

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2 Author(s)
McEwan, N.J. ; Dept. of Electr. Eng., Bradford Univ., UK ; Goldsmith, P.F.

A Gaussian beam propagating in the `z' direction is described by a 1/e width parameter w(z), and a parameter R(z) which is normally described as the radius of curvature of the wavefront, although the wave is not truly spherical. A reflector antenna can be designed using conic sections as though R(z) is a true spherical wavefront radius. At a beam waist w takes a minimum value w0 and R is infinite. If the beam is required to have specified values of w and R at some point, then the distance z from the waist is given by R/(1+(Rλ/πw2 )2). This shows that the beam waist has a large displacement from the geometrical focus towards the reflector if the latter has a small value of D2/fλ. Two designs using these principles are reviewed

Published in:

Millimetre-Wave and Quasi-Optical Antennas, IEE Colloquium on

Date of Conference:

14 Jun 1990