Superdirectivity Technology As the design and development of the PRS progresses, the implementation of the system will benefit from technology developments being pursued in this and other related technical areas. Of particular interest is the use of antennas exhibiting superdirectivity. Superdirectivity exists when the antenna's directivity is greater than that normally defined by its geometrical considerations. This would benefit the overall efficiency of the PRS system. A superdirective transmitter aperture would provide a more tightly focused beam, and therefore, also increase the beaming efficiency for a PRS reflector of a given size. Further developments will be required before practical applications of this technology are realized. Considering the advances being made in the use of high temperature superconducting materials, this technology may be mature enough for application to the development of a PRS system.
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