Читать книгу Handbook of Microwave Component Measurements - Joel P. Dunsmore - Страница 22

Just as there are a variety of S‐parameters, which are derived from the fundamental parameters of incident and reflected waves a and b, so too are there many power parameters that can be identified with the same waves. As inferred earlier, the principal power parameters are incident and reflected, or forward and reverse, powers at each port, which for Z₀ real, are defined as

(1.46)

The proper interpretation of these parameters is that incident and reflected power is the power that would be delivered to a nonreflecting (Z₀) load. If one were to put an ideal Z₀ directional‐coupler in line with the signal, it would sample or couple the incident signal (if the coupler were set to couple the forward power) or the reflected signal (if the coupler were set to couple the reverse power). In simulations, ideal directional‐couplers are often used in just such a manner.