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Wireless communication has already made a huge impact on various different sectors. Many people have become involved in the specialization in communication fields. This includes basic knowledge of communication concepts like different types of Communications Antennas. Communications antennas play a significant role in these wireless communication systems.
Communications Antennas are electrical devices and basic but necessary component of any electrical circuit since these are capable of providing interconnecting links between transmitter and free space and vice versa. Let’s get into the topic thoroughly.
Why Should You Use Communications Antennas?
Communications antennas allow a simple way to transfer signal/data with ease where other methods are not as easy as this to operate. These communications antennas are able to convey a large number of simultaneous communications.
It improves wireless system performance which increases signal quality, capacity as well as the coverage. to allow an increase of a significant number of users. These also provide a high level of security and reduce energy consumption while handling a larger number of users by reusing antennas frequencies while offering increasing speeds.
How Do Communications Antennas Work?
- There are two main pieces in communications antennas, i.e., Antennas and Transmitters. From a transmission line, a signal is given to an antenna. There the signal is converted into electromagnetic energy that is transmitted through free space.
- An antenna can be used in both transmission and electromagnetic radiation’s reception. A transmitting antenna collects electrical signals from a transmission line then convert the signals into radio waves. There a receiving antenna is used to do the opposite. So, receiving antennas receive radio waves from the space and then convert them to electrical signals to feed into some systems such as a radio, television or a mobile network, etc.
What Are The Important Things To Keep In Mind While Choosing Communications Antennas
There are various kinds of communications antennas available. If you are looking for one then you should at least know about how many different types, their properties to start thinking about your requirements. That’s why we have provided some important points below-
Types of communications antennas
There are several different types of communications antennas available in the market and they have their own functionality of working. Some of the common types are listed below-.
1. Wire Antennas
This type of antenna is one of the most commonly used antennas. They usually found in vehicles, aircraft, buildings etc. Wire antennas come with various different shapes as well as sizes, for instance, Straight wire or Dipole, Loop and Helix.
2. Dipole Antenna
Dipole Antenna includes two conductors in the same axis. It includes long pieces of wire/ metal tubing which forms a straight line, however, is not connected to each other. The length of the wire of these antennas is small when compared to the wavelength.
3. Short Dipole Antenna
These types of antennas are the simplest of all communications antennas. Basically, it is an open circuit wire along with the signal that goes to the centre. This type of antenna’s length of the wire is less than a tenth of the frequency of the operation’s wavelength.
4. Loop Antenna
The name says it all. This type of antenna is formed by single or multiple turns of wire that forms a loop. Loop antenna produced radiation is comparable to the short dipole antennas mentioned above.
5. Aperture Antennas
Aperture Antennas are a type of directional antennas. These features an opening in the surface. This type of antenna usually comes with a similar guiding structure to dipole/loop antenna along with an opening for emitting radio waves.
6. Monopole Antenna
Monopole antennas are the half of dipole antennas which is located over a grounded plane. The radiation pattern will be similar to the half-wave dipole antenna. But the radiated total power is half compared to the dipole antennas. These types of antennas directivity become double than the dipole antennas. This type of antenna is also used in vehicles.
6. Slot Antenna
This is a type of aperture antenna that contains one or multiple slots cut on the surface of the waveguide. The appliance of this type of antenna is usually in microwave frequencies. Slot antennas come with an omnidirectional radiation pattern.
7. Horn Antenna
These types of antennas are one of the most popular. This impacts the transition between the wave propagating and transmission line in free space. These types of communications antennas act like a natural augmentation in a waveguide.
Communication antennas that radiate signals equally in all directions called an isotropic antenna. These antennas do not exist in practice, however, if we consider an isotropic antenna, then its power density will be exactly same at all points on the sphere of radiation. Hence, the average power of an antenna as a function of radiated power is
the average power radiated to the ratio of the density of power is known as directive gain (Pavg = Prad / 4πr2 W/m2).
Aperture which is also known as Effective Aperture participates in reception as well as transmission of electromagnetic waves. The antenna that receives the power gets associated with the collective area. This is the area of an antenna which is known as an effective aperture.
In other words, more precisely, an antenna’s aperture is the ratio of the received power to the load to the average produced power density by the antenna.
This is a very crucial part of communications antennas. In communications antennas, the bandwidth is the range of frequencies which is for maintaining the characteristics of the antenna to the specified value. The reason is the requirements for the characteristics of the antenna, such as the required constant wave ratio, gain, impedance, etc., may change during operation.
You must consider thinking about the Input Impedance. You must match the input impedance of communications antennas to that of the input transmission line. This is a crucial factor because if the input impedance doesn’t match, then the system will start to degrade over time because of the reflected power.
Applications of Communications Antennas
- Communications antennas are a piece of metallic rod or dish, typically used as a metallic device to radiate and receive electromagnetic waves which are basically used for transmitting signals. The waves transmitted and received are partially magnetic and partially electric. Transmitter and receiver antennas are similar. Communications antennas are essential to all forms of advanced virtual telecommunication.
- Communications antennas featuring a broad bandwidth are helpful to broadcast television since it is important in order to receive a number of different channels. Although nowadays many people prefer to stream their programmes. But this is not useful in every communication systems like for telephone, an antenna with broader bandwidth is not much useful.
- For mobile or satellite communications, antennas are essential to obtain a radio wave transmission with a relatively narrow frequency bandwidth. Antennas on an FM radio do not have much directionality since they are able to capture signals from virtually any direction.
- There are so many applications of communications antennas have been developed, especially nowadays when security measures are prime concerns.
Communications antennas have become a part of everyday used gadgets. Reading an article online is an example of using these antennas. These have become the most popular technology in TV broadcasting as well as home Wi-Fi networks. they are also be seen in vehicles, highway toll devices, and more. Dipole antennas are the most used type and most people are familiar with the basic of it. we hope that this article will help you find the perfect one that will meet your requirements.