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Spatial power combiner using a planar lens array

In this paper, a planar lens array is proposed to combine distributed sources. The array consists of specially tailored perfect lenses based on a negative-index material and transformation electromagnetics. The material parameters in each sector are homogeneous. High-efficiency spatial power combination for omnidirectional radiation, which is difficult to achieve by any conventional technique, can be obtained using the proposed array. The numerical results of specific examples demonstrate that the sources embedded in the array are virtually shifted to a distance from their original locations to the required place. Thus, the perfect power combination is achieved. A specific design is also provided to illustrate that a high-efficiency directional radiation system can be easily constructed when the array is combined with a planar reflector.