Metasurface-Based Cylindrical Lenses and Their Antenna Gain Enhancement

Figure 15

Frequency-dependent magnitudes of input reflection coefficients, main lobe gain, and radiation efficiency of the freestanding microstrip patch antenna element and the R-type cylindrical metasurface lens antenna. (a, c) TE-polarized radiation. (b, d) TM-polarized radiation.

(a)

(b)

(c)

(d)