What is a Wi-Fi Antenna? Things to know about Wi-Fi antennas

Besides antenna-equipped devices such as televisions, network devices such as Wi-Fi routers also use antennas to receive and broadcast Wi-Fi. So what is a Wi-Fi Antenna? To learn more, let’s see what you need to know about Wi-Fi antennas with Tnhelearning.edu.vn through the following article!

What is a Wi-Fi Antenna? Functions of the Wi-Fi antenna

Wi-Fi antennas are components of network devices such as Wi-Fi routers, Wi-Fi range extenders, adapters, etc., which perform an important function, helping to radiate and receive electrical waves. stronger word. As a result, meeting the needs of users to use Wi-Fi well.

Function of Wi-Fi antenna :

• Depending on the specific type of antenna, when connected to the transmitter, the antenna will collect the AC signals and send them straight, and then radiate the RF waves in a specific pattern.
• If connected to a receiver, the antenna picks up the RF waves it receives and sends an AC signal to the receiver.
• The antenna transmitting the RF signal will be compared or referenced to an isotropic radiator.
• If you want to increase the power of an antenna as it is emitted, then you can transmit or focus the RF signal emitted from the antenna. At the same time, you can generate more power at the generator but this way is quite expensive for the user.

Working principle of Wi-Fi antenna

For transmitting antennas, the antenna converts electrical energy into radio waves. In contrast, for the receiving antenna, the reverse is converted to the conversion of radio waves into electrical energy.

The frequency at which the antenna can receive or transmit will be directly related to the physical size of the wire or the length of the antenna.

Antenna classification

Wi-Fi antennas are responsible for converting RF high-frequency signals into waveforms to be emitted into the air, so antennas are classified into 2 main types as follows:

• Omnidirectional – omnidirectional antenna :

Omni-directional antenna, also known as Omni-directional , transmits RF signals in all directions parallel to the ground, that is, in the horizontal axis. However, it will have to be perpendicular to the ground and limited by the longitudinal axis.

This type of antenna provides the widest coverage, with a gain of about 6 dB . Therefore, antennas are often used in high-rise buildings or apartments.

Some common types of omni-directional antennas such as Rubber Duck, Omni-directional, Small Desktop, Mobile Vertical, Ceiling Dome.

• Directional – Directional Antenna :

The opposite of an isotropic antenna is a directional antenna, also known as a directional ( Semi-directional ). The broadcast direction of the directional antenna is very narrow, in order to receive the broadcast from the antenna, the receiving device needs to be exactly within the narrow broadcasting range of the directional antenna.

High gain antenna up to 12 dB or higher. These types of antennas typically transmit in guests long distances and connect point-to-point wirelessly. On the market, there are many types of antennas with different orientations, with diverse designs and sizes, such as Yagi, Patch, Backfire, Dish…

• High directional antenna :

Highly directional antenna, also known as Highly-directional , is transmitted with a very narrow beam, so it is mainly used for PtP or PtMP connection.

This type of antenna is like a satellite dish, called a parabolic antenna or a mesh antenna.

Hope the above article will help you know more about what is a Wi-Fi antenna? Any questions please leave a comment below!