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Direct PO optimized dual-offset reflector antennas for small Earth stations and for millimeter wave atmospheric sensors

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3 Author(s)
Schlobohm, B. ; Microwave Dept., Bremen Univ., Germany ; Arndt, F. ; Kless, J.

An efficient direct numerical synthesis method for dual offset reflector antennas which is directly based on the physical optics procedure for both reflectors (PO-PO-method) and where the reflector surfaces are advantageously characterized in the spatial domain by a 2D Fourier-transformation is described. The method uses an evolution-type optimization algorithm to shape both reflectors simultaneously so as to generate the desired far field with prescribed criteria. The efficiency of the design method is demonstrated for two computer-optimized dual-offset antenna designs for space applications, a very compact optimum shaped Gregorian Earth station antenna with high offset angle (70°) and small subreflector size (13 λ) and a shaped Cassegrain atmospheric sensor antenna for 200 GHz. The theory is verified by available measured results

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:40 ,  Issue: 6 )