# Tag Info

### Contradiction between wave impedance mismatch and transmission line theory

This is an electromagnetic problem, not a circuit theory problem. Treating your transmission lines as circuit theory elements is fine for continuous lines but breaks down at junctions. In general ...
• 3,306

### Contradiction between wave impedance mismatch and transmission line theory

If the two transmission lines have the same characteristic impedance, then if you can connect them without introducing any other impedance in the transition region, there will indeed be no reflection ...
• 167k
1 vote

### Contradiction between wave impedance mismatch and transmission line theory

Right, the wave spreads out into the higher-bulk-impedance but shorter/wider perimeter, which balance each other out for zero total effect. That's still a very hand-waving explanation, but may help ...
• 34.4k
1 vote

### Contradiction between wave impedance mismatch and transmission line theory

The velocity of propagation, $V_P$ in a t-line is $\frac{1}{Z_0\cdot C}$ and this does not cause a reflection at the junction where two t-lines of equal $Z_0$ but unequal $V_P$ meet. It's a ...
• 458k
your $\eta$ formula is for a wave freely travelling in a medium. That's not the case for a transmission line, so you're applying the wrong formula there. The physics doesn't "care" about ...