In the preceding chapters, theoretical investigations and experiments on a number of Fresnel zone antennas are presented. This chapter is intended to introduce a wider range of Fresnel zone antennas. Section 7.1 presents a theory regarding the possibility of producing single printed Fresnel lens that doubles the efficiency of the simple Fresnel lens (transmission zoneplate). The rest of the chapter is devoted to other Fresnel zone antenna configurations published in the open literature by other researchers in the field. Readers who are interested in the application of Fresnel zone concept in different fields are recommended to refer to  for a comprehensive review.
KeywordsReflection Loss Fresnel Zone Wave Zone Fresnel Lens Antenna Efficiency
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