Active reflection coefficient

When we talk about things that make signals move, we use something called "reflection coefficient." Think of it like your favorite game of catch. When you throw the ball, sometimes it bounces off a wall or the ground and comes back to you, right? That's kind of what happens with signals in electronics.

The reflection coefficient tells us how much of the signal that goes out comes back to the starting point. It's like measuring how much of the ball comes back to you after it bounces off something. Sometimes, the ball bounces back just as strong as it went out - this is called "active reflection coefficient." It means the signal is really powerful and the thing it bounced off of didn't change it very much.

So, when we use the active reflection coefficient, we're looking at how much of the signal stays the same after it bounces off something. It helps us figure out if the thing it bounced off of is affecting the signal at all. And just like in your game of catch, sometimes the ball bounces back really strong and sometimes it barely comes back at all. The active reflection coefficient just helps us keep track of those changes in the signal.