“…The coefficientsa i n ,a s n , and a t n are the amplitudes of the incident, scattered and transmitted fields, respectively.Á d andÁ m are the intrinsic impedances of dielectric and metal, respectively.k d = k 0 √ ε d andk m = k 0 √ ε m are, respectively, the numbers in the dielectric and metal, and k 0 is the free-space wave vector.ε d and ε m are, respectively, dielectric constants of the dielectric and metal, and r is the radius of the disk [19]. J n and J n are the first kind Bessel function with the order n and its derivation,…”