[SOLVED] Question about impedance matching

[hunas2127]

Until now, I was only familiar with conjugate matching, but while reading papers, i came across the term "reactive matching"
I'm curious about the difference between it and traditional matching

also, I'm wondering what the difference is between a transmission line and an artificial transmission line
artificial transmission line

 

[mtwieg]

Until now, I was only familiar with conjugate matching, but while reading papers, i came across the term "reactive matching"
I'm curious about the difference between it and traditional matching
View attachment 198615
also, I'm wondering what the difference is between a transmission line and an artificial transmission line
artificial transmission line

I've never heard the term "reactive matching".

"Artificial transmission line" likely refers to a lumped element transmission line, i.e. a group of inductors/capacitors meant to behave like a transmission line.

 

[D.A.(Tony)Stewart]

likely {conjugate} reactance matching

 

[hunas2127]

I've never heard the term "reactive matching".

"Artificial transmission line" likely refers to a lumped element transmission line, i.e. a group of inductors/capacitors meant to behave like a transmission line.

I don't fully understand.
A transmission line is used as a replacement for inductors and capacitors,
but does this mean that inductors and capacitors are used to replace the transmission line?
If a large inductance value is not required, I don't see a reason to use an inductor.

 

[D.A.(Tony)Stewart]

An Nth order ladder filter has some characteristics of a transmission line.

 

[FvM]

I don't fully understand.
A transmission line is used as a replacement for inductors and capacitors,
but does this mean that inductors and capacitors are used to replace the transmission line?
If a large inductance value is not required, I don't see a reason to use an inductor.

Quoted paper seems to refer to IC design. In this context, transmission lines are probably not an option.

 

[mtwieg]

I don't fully understand.
A transmission line is used as a replacement for inductors and capacitors,
but does this mean that inductors and capacitors are used to replace the transmission line?

Yes, sometimes transmission lines are desirable, like for making couplers or splitters/combiners.

For example if I want to make a wilkinson splitter for operation at 1MHz, I'm not going to use 50m of transmission line for the quarter wavelength branches. I'll use a compact LC circuit instead which mimics a quarter wave transmission line.

 

[D.A.(Tony)Stewart]

Quoted paper seems to refer to IC design. In this context, transmission lines are probably not an option.

for a 1 cm wavelength, laser trimmed Ceramic hybrids are viable for accuracy.

 

[hunas2127]

Yes, sometimes transmission lines are desirable, like for making couplers or splitters/combiners.

For example if I want to make a wilkinson splitter for operation at 1MHz, I'm not going to use 50m of transmission line for the quarter wavelength branches. I'll use a compact LC circuit instead which mimics a quarter wave transmission line.

I understand. Thank you

 

[FvM]

for a 1 cm wavelength, laser trimmed Ceramic hybrids are viable for accuracy.

Yes, surely with outstanding performance. But still off-chip, beyond scope of 0.25 um "GaN amplifier" design.