Reflection power and reflection measurement

　　Reflected power is the sum of all the power output by the device to the capacitor plate or inductor coil, including the effective power ultimately absorbed by the load and the unabsorbed reflected power. Usually referred to as Pr.

　　Reflection measurement is an important component of network measurement. For RF signals, reflection occurs when the impedances of two connected devices are different. Reflection measurement is the measurement of the ratio relationship between the reflected signal and the incident signal.

　　The network analyzer uses an R receiver to measure the incident signal and an A receiver to measure the reflected signal. Therefore, the reflection measurement is often expressed as the ratio of A to R (A/R). We can fully quantify the reflection characteristics of the measured object using the amplitude and phase information of the A and R receiver signals.

　　In S-parameter terminology, S11 represents the reflection at port 1 (input port) of the test piece, and S22 represents the reflection at port 2 (output port) of the test piece. The purpose of conducting reflection measurements is to ensure effective transmission of RF energy. If energy is reflected, it means that very little energy is transmitted to the desired destination; In addition, if the reflected energy is too large, it may burn out devices such as output power amplifiers.

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