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How to build a power wideband directional coupler?

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sintis

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wideband directional coupler 100w

I want to design and build a high power, up to 100W wideband 20MHz - 500MHz directional coupler with 30dB - 40dB coupling

Any suggestions?

Thanks in advance
 

how build a directional coupler

You are looking for a stepped directional coupler. The unit will be large though !!.

Paul.
 

wideband directional coupler

I am also interest in issue
How to build bi-directional coupler 800MHz÷2200GHz?
 

Look at this paper. The same design idea with high power coax cable is introduce in old russian papers at **broken link removed**
 

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