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Comments on Low loss impedance matching without a transformer

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Low loss impedance matching without a transformer

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I have a signal at 10 MHz produced from a 50 Ω source. How can I match that to a 300 Ω load with low losses without using an RF transformer (space constraints)? Are there any circuits and formulas that can help me achieve this?

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As an alternative to doing the math, as detailed in Andy's answer, you can use a graphical aid called a Smith chart:

Image alt text

These were used routinely before computers to match transmitters to antennas. The math behind them is what Andy described. See the Wikipedia page for details, which is where the image above was copied from.

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Andy aka‭ wrote over 4 years ago · edited over 4 years ago

@Olin your image is not showing. I am going to add more sections to this answer so it might be that your answer "what Andy described" might not hit the mark in terms of the fullness of what I hope to complete!

Olin Lathrop‭ wrote over 4 years ago

@Andy: Strange. I see it in my browser. I'm using Edge on Win 10, and also just tested it with IE on Win 10. Both showed the image correctly. What browser and OS are you using?

Andy aka‭ wrote over 4 years ago · edited over 4 years ago

@Olin I'm using google chrome and I still can't see it - bug alert!!!

manassehkatz‭ wrote over 4 years ago

And I can't see it Firefox on Android

Skipping 1 deleted comment.

Olin Lathrop‭ wrote over 4 years ago

@Andy: See the main meta question https://meta.codidact.com/questions/276272 and let them know which images you see.

Olin Lathrop‭ wrote over 4 years ago

@Andy: I changed the TIFF image to JPEG. Can you see it now?