| 摘要 |
PURPOSE: A high directional coupler is provided to achieve a high directional coupler without a high-precision manufacturing process. CONSTITUTION: A directional coupler includes a transmission line(100), a first coupler(120) coupled to the transmission line(100), a second coupler(122) coupled to the transmission line(100), and a connector(124) having a first input connected to the first coupler and a second input connected to the second coupler. The first and second directional couplers which respectively generate a forward signal and a backward signal from a signal propagating through a transmission line. The connector connects the forward signals by an addition system and the backward signals so that they can cancel each other.
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