3db合路器，它能夠沿傳輸線路某一確定方向上對傳輸功率連續取樣，能將一個輸入信號分為兩個互為等幅且具有90°相位差的信號。主要用於多信號合路，提高輸出信號的利用率，廣泛應用內覆蓋系統中對基站信號的合路。
The 3db Coupler is also called the same frequency combiner. It can continuously sample the transmission power along a certain direction of the transmission line, and can divide an input signal into two signals with equal amplitude and 90° phase difference.
It is mainly used for multi-signal combining to improve the utilization of output signals, and is widely used for combining base station signals in indoor coverage systems.
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腔體型合路器
