Metasurface-Based Cylindrical Lenses and Their Antenna Gain Enhancement

Figure 1

Cross-sectional view of the cylindrical geometry considered for the lens operating in (a) T-type or (b) R-type. Arbitrary position P on the cylindrical surface can be characterized by its corresponding central angle α formed between + x axis and OP. At position P, its angle of incidence θ_i is formed between the local outward-pointing normal n and the incident wave vector k. The angular interval between adjacent sampling positions is denoted as δ.

(a)

(b)