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I am a newbie at microwave. I'm confused about impedance matching. So far just 50 Ω impedance stub in outside.

enter image description here

But in this example below I saw 75 Ω. I could use the Smith Chart but I didn't know how to solve this. Can anyone give me a clue about this?

The question is simply: How can I arrange 75 Ω? Short stub and open stub; both solutions are the same case?

enter image description here

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  • \$\begingroup\$ It's not clear what you are unsure of. Impedance matching isn't a microwave phenomenon by the way. Your question is How can I arrange 75 ohm? and this isn't really a sufficient enough question to be able to answer. \$\endgroup\$
    – Andy aka
    Commented Dec 31, 2022 at 21:17
  • \$\begingroup\$ Try this amanogawa.com/archive/DoubleStub/DoubleStub-2.html \$\endgroup\$
    – Antonio51
    Commented Jan 1, 2023 at 9:36

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