关于微带40dB耦合器

这种弱耦合是很难做，以前我用1/4波长做过，不过效果很是不理想，最后是用的电阻耦合实现的。如果你用1/8波长 隔离不够的话 调节下隔离端那个电阻或者在带线上调节下看看效果。没什么太好的办法，耦合度太低，关注中。

for simple microstrip coupler, isolation is usually 10dB lower than the coupling factor, for your case, you most likely to get -50dB or its directivity is 10dB;
for higher directivity design, complicated multi-stage design is needed; so space is a big issue here; unless you try other technologies;
if you are using the coupler in high power situation, it will be a big problem then; for in high power situations, complex signal reflection and EM coupling of the circuits will cause directivity even worse; for some careless cases, you will got 0dB directivity

楼上的
请问耦合度要30到40这样的
方向性要20
有没有实例
给大家分享下

用悬置线来做，可以显著提高方向性

谢谢楼上各位。现在问题还没有解决。空间有限，多节的方式可能无法实现。
5楼的朋友，你说的“悬置线”是类似带状线的形式吗?

怎么没人了呢