定向耦合器广泛地用在现代微波系统中，高方向性定向耦合器的方向性测试是其难点。

Directional coupler is widely used in modern microwave system, how to test directional coupler's directivity with high directivity is a difficulty.

youdao

定向耦合器广泛地用在现代微波系统中，高方向性定向耦合器的方向性测试是其难点。

Directional coupler is widely used in modern microwave system, how to test directional coupler's directivity with high directivity is a difficulty.

youdao