When we talk about electricity, the first thing that comes to our mind is wires. Basically, wires are the fundamental way of transmitting electrical energy from one location to another, regardless if it comes from a circuit board or a high-voltage transmission.
Historically, humans are very hard to please, most especially in the essential ways of doing things. That is why it is not surprising that efforts were made in order to free electrical functionality from the restrictions of physical interconnections.
There are a lot of ways of combining wireless functionality and electrical system. For instance, making use of electromagnetic radiation, which is also considered as the foundation of RF communication. Nevertheless, it is important to know that electromagnetic radiation is not exceptional when it comes to its capability in extending electrical circuitry into the wireless realm.
Keep in mind that anything that travels through a nonconductive material can be used as a way of converting electrical energy into information which does not necessarily depend on conductive interconnections.
Having this mind, we could ask ourselves more important questions. For instance, why do we prefer to use electromagnetic radiation? Aside from electromagnetic radiation, are there other types of wireless communication that we can use? But before answering these questions, we need to learn what electromagnetic radiation is.
What Are Waves and Fields?
Learning the details of electromagnetism would take years. The good news is, you don’t have to be an expert on this in order to design and implement RF circuits successfully. However, you do need to have some knowledge about the energy being released from your device’s antenna.
As the name says, electromagnetic radiation includes both electric fields and magnetic fields. So, if you have voltage, then you have an electric field. Also, if you have an electric current, then you have a magnetic field. Also, you need to remember that the intensity of the field is proportional to the magnitude of the current.
Furthermore, even if the magnitude of the current remains constant, there are still electric and magnetic fields that exist. Nevertheless, these fields are not capable of propagating. If you require a wave that can propagate into the universe, then there must be some changes that will occur in voltage and current.
The propagation that will take place will depend on the relationship between the magnetic and electric components that are found on the electromagnetic radiation. A changing magnetic field can produce an electric field. At the same time, a changing electric field can produce a magnetic field. This ability of mutual regeneration is recognized as a distinctive entity, also known as an electromagnetic wave. After it is generated, this wave can travel away from its source, traversing each day at the speed of light into the unknown.
How to Create and Control EMR?
Designing a complete RF communication system might not be easy, however, generating electromagnetic radiation (EMR) is quite easy. The truth is, you can even generate it even if you don’t intend to.
Any circuits that includes time-changing signals have the ability to produce EMR, including digital signals. Usually, EMR is just noise. You can even disregard it if it does not cause you any trouble. However, in some instances, it can interfere with other circuitry and as a result, it can turn into electromagnetic interference (EMI).
As we’ve realized, RF design is not simply about producing EMR. Instead, RF design can generate, manipulate, and interpret EMR, allowing the transfer of important information between two circuits even if there are no direct electrical connection that is involved.
Why Use EMR?
Designing a complete RF communication system might not be easy, however, generating electromagnetic radiation (EMR) is quite easy. The truth is, you can even generate it even if you don’t intend to.
Any circuits that includes time-changing signals have the ability to produce EMR, including digital signals. Usually, EMR is just noise. You can even disregard it if it does not cause you any trouble. However, in some instances, it can interfere with other circuitry and as a result, it can turn into electromagnetic interference (EMI).
As we’ve realized, RF design is not simply about producing EMR. Instead, RF design can generate, manipulate, and interpret EMR, allowing the transfer of important information between two circuits even if there are no direct electrical connection that is involved.
What Are Waves and Fields?
EMR-based systems are very popular compared to other types of wireless communication. There are a lot of reasons why RF is commonly used by wireless transmission, and here are some of them.
Quickness
EMR is the expansion of the electrical signals. Whether you like it or not, time-changing currents and voltages can produce EMR. Moreover, this EMR is an accurate interpretation of the AC components coming from the original signal. EMR is very responsive. Transmitted RF signals can accurately reproduce even if state-of-the-art wireless systems are using high-frequency waveforms that are extremely complex.
Speed
When using AC-coupled systems, the transmission of data will likely depend on how fast a signal can experience variations. This means that there must be something done with the signal so it can convey information.
Apparently, EMR is a very practical medium of communication most especially at very high frequencies, since RF systems can attain extremely high rates of data transfer.
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