Distance (mm) between two coupled lines

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denizduran

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I am trying to design a coupled line coupler at 2GHz in CST and want to know what the distance between my two coupled lines are. The design frequency is 2GHz and the coupling coefficient is 35.36. How can I find the distance between the lines?
 

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Yes, eventually a 4 port directional coupler with two coupled lines in the center. I want to know how I can find the distance between the coupled lines so I can draw it on CST.
 

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Does 35.36 Coupling Coefficient mean 15.5dB ?
-What are your substrate specifications ?
 

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denizduran said:
I am trying to design a coupled line coupler at 2GHz in CST and want to know what the distance between my two coupled lines are. The design frequency is 2GHz and the coupling coefficient is 35.36. How can I find the distance between the lines?
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It depends on the host transmission lines you are using. Is this microstrip? If so, there are design charts -- see Pozar's Microwave Engineering, for example.
 

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