Field Enhancement in a Grounded Dielectric Slab by Using a Single Superstrate Layer

Figure 5

Enhancement factor as function of the structure’s normalized operating frequency 𝑓/𝑓₀ for 𝑓₀=300THz, 𝜖_𝑟1=50−5𝑗, 𝑤₂=0.25𝜆₀ with (a) 𝜇_𝑟2=1 and 𝜖_𝑟2=2,5,10,15 and (b) 𝜖_𝑟2=5 and 𝜇_𝑟2=1,2,3,4.

(a)

(b)