Wave Behavior in the Presence of a Shield

Now that we have covered basic concepts of waves, we can now see how these waves behave in the presence of a shield.There are two types of modes that we will look at in regards to wave behavior.

Absorption Mode

The first mode is the absorption mode like when we have an antenna with a signal and the signal propagates in space, and you have the shield somewhere along that path. It is called an absorption mode because the signal, as it passes through the shield, absorbs some of the signals, and therefore on the other end, there will be a signal with less energy. Thus, with absorption mode, we have mitigated the strength of the incoming signal.

Reflection Mode

With reflection mode, we have an antenna with a signal, and the signal propagates to a space. We have a shield in the path, and the shield reflects some of the signal back to the source or to another direction. In the process, it also takes some of the signal away, absorbs some of the signal, and mitigates the incoming signal. Therefore, the reflected signal will have a lot less energy than the incoming signal. These are the two modes of behavior for shields - they can either absorb or reflect the signal.

Depending on the material, on their orientation, and on a few other factors that will be discussed in future blog posts, this shield may behave differently. So, perhaps, one mode may take a more of a dominant effect on the other one, so we're going to discuss that in the next posts.

In a more realistic scenario, I must mention that most shields have a bit of reflection mode, as well as a bit of absorption mode. So, the thing that can go through and can be reflected, but things combine - it's just that one takes more of a dominant role than the other one.

Want to learn more? Stay tuned for more posts about shields, their uses, measurements, and more.

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