Absorption Efficiency and Physical Bounds on Antennas

Figure 2

The extinction, 𝜎_ext, absorption, 𝜎_a, and scattering, 𝜎_s, cross sections for the idealized dipole antenna (4), depicted in Figure 1, and (10) as function of the normalized wavelength 𝜆/𝑎=2𝜋/(𝑘𝑎).