Twin lead Tx line radiation losses

AI Thread Summary
At high frequencies, twin lead transmission lines experience significant radiation losses due to conductor spacing being comparable to the wavelength, which can cause them to function as antennas. Despite this, using a twin lead with 1 cm conductor spacing to transfer a ~10 GHz signal over a short distance of a couple of centimeters may still be feasible, as the short length could mitigate radiation losses. The preference for twin lead over coax is driven by the need for compact design and avoiding additional components like baluns. Amplifiers will be necessary regardless of the transmission line type to manage signal strength. Overall, while challenges exist, using twin lead for this application could be a viable option.
Mrcelloman99
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Hi all

I understand that at high frequencies, a twin lead Tx line has high radiation losses because the conductor separation becomes close to the wavelength size, allowing the conductors to act as antennas. Can one still be used to transfer a high frequency signal a short distance from an antenna to a receiver though? More specifically, could one use a twin lead with a 1 cm conductor spacing to transfer a ~10 GHz signal (wavelength ~3 cm) if the line length is only a couple of centimeters at most? Or will the radiation losses be too high even for that? The reason I would want to do that over using a coax is that the device I am making needs to be as compact as possible, and I would rather not have to devote room to baluns. My signal doesn't have to be that strong anyway at the end of the day and I have amplifiers (which I will need to use whether I use a coax or twin lead) to deal with signal strength issues.

Thank you
 
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