Patent ID: 8260219

Claim:
A network communication device, comprising: a processor, to implement working tasks of the network communication device and generate and output electronic signals; an amplifier circuit, to amplify the electronic signals output from the processor; a storage module, to store a safety parameter threshold table recording one or more safety parameter thresholds; a matching circuit, to match impedance of the amplified electronic signals to output matched electronic signals to a load, the matching circuit comprising: a transmitting route connecting the amplifier circuit to the load, to output the matched electronic signals to the load; and a coupling route; and a detection and control module electrically connected to the coupling route of the matching circuit and the storage module, to detect output signals and reflection signals of the coupling route, calculate a safety parameter according to the output signals and the reflection signals, compare the calculated safety parameter with the one or more safety parameter thresholds in the safety parameter threshold table, and generate control signals based on the comparison to control the amplifier circuit; wherein the processor determines if the load is abnormal according to the control signals and generates load abnormal signals if the load is abnormal.