METHOD FOR DEFINING THE STRUCTURE OF A Ka BAND ANTENNA

摘要

A method is provided for defining an antenna with weak sidelobes having at least two sources, in which the sources are regularly distributed and the reflectors have suitable shapes, obtained by the implementation of a specific algorithm, the reflectors being illuminated by sources composed of a single part. The obtained antenna will offer a gain close to 0 in the direction of the array lobes, so these will be as low as possible.

主权项

1. A method for determining the geometry of a planar multi-focus array antenna for the Ka band comprising at least two antenna elements, each antenna element comprising a reflector and a sub-reflector, at least one source powering said antenna elements, the method comprising at least the following steps:
defining a threshold value Gseuil of the antenna gain, representing the surface of the sub-reflector and the surface of the reflector by a set of points ((XS, ZS) for the sub-reflector and (XSR, ZSR) for the reflector), generating from a suitable electromagnetic simulation module a set of pairs of values {(θ1, G1) . . . (θn, Gn)} corresponding to the direction of the radiation and the antenna gain for each antenna element and for each set of points chosen to represent the surface of the sub-reflector and of the reflector at a position of the source, determining for each pair of values and from the pattern of an elementary source under consideration, the value of the maximum antenna gain in the direction of the array lobes, comparing the value of the maximum gain obtained, and if this value is above a threshold value, then varying at least one of the parameters ((XSR, ZSR) for the sub-reflector and (XR, ZR) for the reflector), determining the shape of the antenna from the points verifying the threshold values.