“power waves”的概念、定义、翻译、参考文献-科学参考

power waves

Electronics and Electrical Engineering

A signal representation used in distributed circuits and transmission lines. In such a circuit or network, the voltage and current vary spatially, therefore the indicated impedance also varies with the location of the measurement. To allow an understanding and analysis of the signal flow in the circuit, the signals are represented by power waves, which describe the incident and reflected signals in the transmission line. Given a simple transmission line circuit (see diagram) of characteristic impedance Z₀, with V_i and V_r as the incident and reflected voltages at the load,
incident power P_i = |V_i|²/Z₀
reflected power P_r = |V_r|²/Z₀
power delivered to load P_L = (|V_i|² – |V_r|²)/Z₀
load reflection coefficient Γ = (Z_L – Z₀)/(Z_L + Z₀)
If this circuit is viewed in terms of power flow, then if the power available from the source is given by
$P_{A} = | a |^{2}$
and the power delivered to the load is
$P_{L} = | a |^{2} - | b |^{2}$
then |b|² can be thought of as the power that is reflected, or scattered by the load. It then follows that
$a = \frac{(V + Z_{0} I)}{(2 \sqrt{Z_{0}})} and b = \frac{(V - Z_{0} I)}{(2 \sqrt{Z_{0}})}$
are the incident and reflected power waves, respectively. They have dimensions of √(power). See also scattering parameters.
Power waves: transmission line connecting load to source

单词	power waves
释义	power waves Electronics and Electrical Engineering A signal representation used in distributed circuits and transmission lines. In such a circuit or network, the voltage and current vary spatially, therefore the indicated impedance also varies with the location of the measurement. To allow an understanding and analysis of the signal flow in the circuit, the signals are represented by power waves, which describe the incident and reflected signals in the transmission line. Given a simple transmission line circuit (see diagram) of characteristic impedance Z₀, with V_i and V_r as the incident and reflected voltages at the load, incident power P_i = \|V_i\|²/Z₀ reflected power P_r = \|V_r\|²/Z₀ power delivered to load P_L = (\|V_i\|² – \|V_r\|²)/Z₀ load reflection coefficient Γ = (Z_L – Z₀)/(Z_L + Z₀) If this circuit is viewed in terms of power flow, then if the power available from the source is given by $P_{A} = \| a \|^{2}$ and the power delivered to the load is $P_{L} = \| a \|^{2} - \| b \|^{2}$ then \|b\|² can be thought of as the power that is reflected, or scattered by the load. It then follows that $a = \frac{(V + Z_{0} I)}{(2 \sqrt{Z_{0}})} and b = \frac{(V - Z_{0} I)}{(2 \sqrt{Z_{0}})}$ are the incident and reflected power waves, respectively. They have dimensions of √(power). See also scattering parameters. Power waves: transmission line connecting load to source
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