The insertion loss of RF duplex refers to the loss of useful signals corresponding to the passband frequency point in the channel. Can be expressed using the formula: 10LgPi/PO or 20lgUi/UO. Where Pi and Ui represent the signal power or level entering the RF duplex; Po and Uo represent the signal power or level output from the RF duplex. It goes without saying that for RF duplexers, the smaller the insertion loss, the better. Especially for the transmission channel, the smaller the insertion loss, which is beneficial for improving the output power and efficiency of the entire machine, and reducing the heat generation of the power amplifier. The domestic RF duplex index is below 1.2dB, and the actual insertion loss of RF duplex in some imported products is around 0.5dB. For a transfer station that requires an output power of 25W, if the insertion loss of the selected RF duplex is 0.5dB, then it is sufficient to require the entire power amplifier to output 28.1W of power; But if the insertion loss of the selected RF duplexer is 2dB, the entire power amplifier is required to output 39.6W of power. The difference between the two is more than ten watts. Therefore, insertion loss, especially the insertion loss of the input channel, is also a very important indicator

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