The Construction of a RF Inductor

Now that we’ve covered a general overview, the materials used, the importance of the Q factor in RF Inductors, and typical applications, our blog series continues with the construction of these inductors.

The first one in question would be a multilayer one, which is simply a situation in which we grow, or lay, layer by layer one loop or one coil, one ring of the coil of an inductor, and the idea is to eventually create a stack configuration in the inductor. Every time we add a layer, we hook it up to the next layer, and therefore create a coil or inductor.

Typically this has a very high resonate frequencies. Up to 17 gigahertz. And the tones range in the order of 5%. The inductances range in the order to maybe 1nH and up to about 400nH would be typical. Of course, it can go higher depending on the site.

The second group would be the thin film, which is actually grown on the surface of the ceramic material. Because they are grown or deposited via photo [lipid] process on the surface of the ceramic, they can have very tight tolerances. Therefore you can find inductors with a plus or minus 1% tolerance. So they tend to be our most effective solution in terms of tolerance.

However, there are some tradeoffs. In this case, one of them would be the fact that the range of inductances is not as wide as it would be without ceramic inductor wire wall.

Another interesting consideration would be the wire wound ceramic innductors. In this case, we have a very wide range of inductances, and they essentially have a piece of ceramic with a coil, an actual coil wound around the core. The charges can be customized between 5% and 2%, where 2% is extremely good and 5% is standard.

There are typically issues with wire wound ceramic inductors like acidic capacitors since we have so many winding. Of course you can see it throughout any of the constructions that we have. But one of the advantages of the wire wound ceramic inductors is that they have such a wide range of inductive value. Therefore, they tend to be some of the most popular ones.

Finally, we also have, for lower frequency banquets, a high frequency ferrite that can be used to tune an RFID system, for example. The construction, again, is the same. We have a core, some contact pads, and of course we have a coil wound around the core.

Want to learn more? Stay tuned for more posts about the types of products, availability of models, tutorials, and general questions.

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