Combiners are divided into co frequency combiners and different frequency combiners. Co frequency combiners refer to 3dB bridges, while different frequency combiners combine N signals of different frequencies into one output microwave device, which is widely used in indoor coverage, WLAN (Wireless Local Area Network), POI (Point Of Interface), cell coverage and other systems. The insertion loss of the 3DB bridge is 3.2, the isolation degree is also 25, and the standing wave is average. But there are two output ports, for example, two 30 inputs and two 27 outputs. The output port of the 3dB bridge can also be arbitrarily determined. Both in and out, in and out, in and out are actually possible. Just connect an additional port with a load of sufficient power. What is not connected to the load is actually disconnected from the factory, which has no different effect than connecting to another load. However, when a high standing wave ratio is required, only 3dB can be used. In addition, the power capacity of the device should also be considered. Two power divider, 3dB bridge and combiner; Combiner: a frequency selective combiner that operates in a filtering and multiplexing manner, capable of synthesizing two or more signals and achieving high isolation synthesis. It is mainly used for combiner in different frequency bands and can provide minimal interference between different systems. Minimum insertion loss, best out of band suppression, and maximum frequency band isolation

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