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In this paper, a review on near-field focused (NFF) antennas for short-range wireless links at the microwave frequency band is presented. The basic working principles, the design guidelines, as well as the synthesis procedures suggested for the near-field shaping around the focal point, will be addressed. The review will also span on the different technologies used to implement NFF antennas at the...
A detailed performance analysis of near-field-focused planar arrays is addressed. Design curves and performance data are shown for planar square arrays as a function of the array size, the inter-element distance, and the focal distance. The performance curves are compared with results presented in earlier studies relevant to continuous-aperture antennas, as well as with numerical results obtained...
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