Compact Planar Reflectarrays
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Discussion of the leaky wave mechanism in Chap. 8 leads to a natural embracing of novel array antennas incorporating passive reflectarrays and Fabry-Perot resonator arrays—all of which have their origins in periodic surfaces and the emerging topics of frequency selective surfaces (FSS), partially reflective surfaces (PRS), high impedance surfaces (HIS) and textured surfaces. These will be examined from an array antenna perspective, and evaluated from the viewpoint of surfaces made periodic by slot patterns on plane surfaces, although physically many arrays of this genre appear more like patch based formations. Theoretically both slot and patch interpretations can be pursued in parallel since patch elements radiate through their edge-slots.