In addition to the indicators discussed above, RF duplex also includes characteristic impedance, maximum input power, standing wave ratio, etc. The maximum input power is the maximum input power that an RF duplex can withstand and is a safety indicator for its use. The input impedance of the antenna of the wireless telephone and the output impedance of the transmitter are both 50 Ω, so it is required that the impedance of the RF duplex should also be 50 Ω. To ensure the safety and communication effect of the entire machine, the standing wave ratio of the RF duplex is usually below 1.4.

　　It is worth noting that the impedance of RF duplexers also changes with their distribution parameters, therefore impedance matching is one of the purposes of debugging. The adverse effects caused by impedance mismatch are even greater than those caused by certain other factors.

　　In summary, there are multiple indicators of RF duplex that are worth considering, but from the perspective of RF duplex itself, these indicators are interrelated and should be comprehensively considered when selecting

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