The 3dB bridge, also known as the same frequency combiner, can continuously sample the transmission power in a certain direction along the transmission line, and can divide an input signal into two signals that are equal in amplitude and have a 90 ° phase difference. Mainly used for multi signal combining, improving the utilization rate of output signals, widely used for combining base station signals in indoor coverage systems, with good application effects in such places.

　　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 and are 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 ports can be used, and an additional port can be connected to 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.

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