Antennas are key components of any type of communication system, including mobile repeaters. Radio, telephone, and television, all have antennas as an important element of their systems. Antennas that receive signals are called receivers while antennas that send out signals are called transmitters or transmitting antennas. For instance, a cell signal booster or a call booster will have two sets of antennas, one for receiving the weak cell signals and the other for transmitting the amplified signals.
In this article, we are discussing antennas in detail.
How Do Antennas Work?
Antennas are used in various forms of communication. Consider the case of a radio broadcast. The microphones at the radio station capture the sound of the speaker and convert them into electrical energy. The signals are then sent out from the antenna at the radio station in the form of electromagnetic waves. The antenna at the receiving end, i.e the antenna of the radio captures these electromagnetic waves and converts them back to sound signals.
Cellular communication is also facilitated by antennas that come inside cell phones and transmitting towers fitted with antennas.
A cell phone booster is a device that is used to boost available cellular signals at a place. The device has two types of antennas; the external antenna that captures the outward cellular signals and transmits them to the amplifier and the internal antenna that broadcasts the boosted cellular signals it received from the amplifier.
Antennas are also crucial in a television broadcast. In fact, homes have antennas that receive television signals from a satellite.
What Are The Key Properties Of Antennas?
Here are the three key features of antennas.
The directionality of antennas differs according to the antenna type. Highly directional antennas have to be aligned perfectly in order to receive signals with perfection. However, omni-directional antennas can capture signals coming from all directions.
The value of gain represents the strength of your reception. Gain is measured in decibels. Different antenna types have different gain values.
The range of frequencies over which an antenna works effectively is referred to as the antenna’s bandwidth. An antenna with a broader bandwidth can pick up a wide range of radio frequencies. This factor is relevant for television because you will need to pick up many channels. But it is not of much use to cellphone, telephone, or satellite communications because you will be interested in communication on a fairly narrow frequency band.
Antennas come in different shapes and sizes. They can be as small as the antenna inside your cell phone and as big as the ones that are designed to capture satellite signals.