Study Of Array-fed Relfector Antenna For Spatial Power Combining Based On Curvature Matrix Theory And NURBS Technique

In information warfare, high-power microwave weapons need to generate high-powerelectromagnetic beams. Since the power capacity of a single microwave power source is small,in order to form a high-power electromagnetic beam, a number of microwave signals must besynthesized using power combining technology. Spatial power combining technology directlysynthesizes multi-channel microwave signals in the free space, and has a higher powercombining efficiency without the loss of synthetic networks in the circuit power combiningtechnology. Besides, the power combining efficiency has basically nothing to do with thenumber of microwave power sources. Array-fed reflector antenna synthesizes power withantenna array as feed and achieves the required gain, sidelobes, and beamwidth by beamforming of reflector antenna, which can greatly increase the gain of spatial power combiningantenna, therefore it has huge prospects for development.The feed of the novel reflector antenna for spatial power combining is an antenna array,the size of which is large, so it cannot be seen as a point source. Classic reflector antennadesign theory and technology are difficult to apply, so it is necessary to develop new reflectorantenna theory. This paper proposes two new design methods of array-fed reflector antenna.One is designing an astigmatic reflector to match the astigmatic waves radiated by large arraybased on curvature matrix theory. The phase configuration method of each element and theincident angle correction method are given. The electromagnetic waves radiated by largearray synthesize with the same phase in the reflector aperture. The other is based on NURBSsurface shape modification, changing the control points of NURBS surface by the geneticalgorithm to achieve the optimal reflector shape. Next, the impact of the aperture boundaryshape of reflector on the aperture efficiency is studied, and the boundary shape with the bestaperture efficiency is given. The reflector antenna beam scanning characteristics, includingelectronic scanning and mechanical scanning, are studied, and a series of beam scanningcharacteristic curves are obtained. Finally, this paper studies the mechanical structure designof the reflector, gives an outline of the other RF components and conducts the actualprocessing, installation and testing of the reflector antenna. The testing results are basicallyconsistent with the simulation results, which validated the superiority and feasibility of thereflector design methods presented in this paper. The data and results of this paper provide atheoretical and technical support for spatial power combining antenna design.