Products > Test Equipment
Smitih Charts, still relevant in 2024?
pdenisowski:
--- Quote from: bson on June 22, 2024, 02:18:26 am ---I don't understand what a Smith Chart really helps with - and never felt I needed one.
I feel like I've always missed something here...
Explain it like I'm 5 please?
--- End quote ---
When I first released my "Understanding the Smith Chart" video I had numerous engineers (privately!) tell me "I've been in RF for X years / decades and I never understood what the Smith Chart was for"
Tation:
--- Quote from: bson on June 22, 2024, 02:18:26 am ---I don't understand what a Smith Chart really helps with - and never felt I needed one.
Certainly not impedance matching? I mean, say I have source impedance of 50+j0Ω, a line of 50-j7Ω, and a load of 45-j20Ω. So matching them requires 5+j27Ω which is a resistor and an inductor. This is kind of elementary, no? If I use the VNA to measure the impedances, isn't the impedance discrepancy obvious? Of course, some devices like antennas don't have a fixed impedance but vary with frequency, usually shifting from inductive to capacitive at the resonant frequency - so can't be matched over a wide band, but how would a Smith Chart help with this?
I feel like I've always missed something here...
Explain it like I'm 5 please?
--- End quote ---
An impedance matching network definitely does not use a resistor, that's wasted power. Also the 50-7j Ohm line impedance is what? The characteristic impedance of the line (quite lossy indeed)? the impedance seen at the line when loaded? with what? I cannot understand at all your "elementary" and "obvious" calculations.
Georgy.Moshkin:
Is Smitch Chart relevant in 2024? Yes, because it used in many books, measurement devices, RF CAD programs, datasheets.
And it doesn't require too much time to learn.
RoGeorge:
My question is, does anybody knows any model of a VNA that does not have Smith chart representation?
Name it please. Asking because I'm not much into RF, and don't know what instruments are out there. It is a genuine question, not rhetorical. If it exists, I'll be curious to look at such an instrument's specs/manual.
coppercone2:
listening to someone mocking you in any way involving a corporate entity knowing how to do things is not a good idea
work is like french fashion club
you get all sorts of deranged arguments, like about looking at hex code. There usually isent a magic new method that's so alien it blows your mind. That only happens when someone is hyper focused on 1 thing that suddenly they think some specific subset of something is the only important thing. Maybe it is, for whatever projects that company is working on at the moment. They are often pigeon holed into something so specific someone else sees their work iterations as the same thing, then of course they see the 'bigger picture' as useless. Its like someone that only interested in godzillas left testicle lol
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