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Circular polarized antenna is an important component in satellite communication. There are many designs in the literature for improving the return loss as well as the axial ratio bandwidth of the antenna [1 4]. A dual-feed structure can provide a wideband characteristic for circular polarized antenna design [1, 2]. However, the size of the antenna becomes larger with the inclusion of the broadband...
With recent successes of laboratory, inatmosphere, and space demonstrations of free-space optical communications, there is no doubt that the technology is ready for operational deployment. While these successes have shown that there are no laws of physics against such systems, their estimated system costs are still much too high for serious considerations. Two types of development can reduce the cost...
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