Читать книгу Antenna and EM Modeling with MATLAB Antenna Toolbox - Sergey N. Makarov - Страница 36

Here, we use the well‐known result for the antenna impedance transformation along a lossless transmission line of length l. In the plane labeled (*) in Figure 1.7b, the transformed antenna impedance (the equivalent impedance of the antenna with the transmission line) becomes [1]

(1.27)

This result is obtained from impedance definition and by relating voltages and currents on the line via its characteristic impedance, Z₀.

We have shown in the previous section that adding the lossless transmission line perfectly matched at the generator does not change antenna power. Now, we are about to show that adding a transmission line mismatched at both ends does change antenna power. It may be quite beneficial for impedance matching.