Читать книгу Antenna and EM Modeling with MATLAB Antenna Toolbox - Sergey N. Makarov - Страница 42

Eq. (1.36) determines the bandwidth when it does not exceed 100%. For broadband antennas, the bandwidth is alternatively determined by the ratio of the upper‐to‐lower frequencies,

(1.37)

Both definitions may overlap. For example, if f_U = 1GHz, f_L = 500MHz, the antenna bandwidth according to Eq. (1.36) is 67% whereas the antenna bandwidth according to Eq. (1.37) is 2 : 1.