Tuesday, September 12, 2017

The use of satellite dish has grown since 1888. In other words, advances in technology use these antennas for a variety of purposes. Parabolic antennas are defined as antennas that use curved surfaces or parabolic reflectors with transverse designs to direct radio waves. These antennas typically have cup-shaped shapes. They have high power and can detect radio waves directly in thin bars or in one direction only. Parabolic antenna also acts as a radar antenna and sends narrow beams to find large objects, such as guided missiles, planes and ships. For satellite, spacecraft and data communications, they are used for WLAN / WAN connections.

The parabolic antenna comes with a small antenna and a metal reflector. The power antenna is in the focus of the reflector. In general, reflectors are metallic surfaces made in parabolic figures. The power antenna receives high frequency (RF) currents across transmission lines of transmitters. Next, these currents are converted into radio waves which are sent back to the parabolic loop via the power antenna. The incoming waves reflect the reception antenna, which is aimed at the power antenna. Then this process turns the waves into power. A radio records these waves via a transmission line.

We can categorize satellite dishes through their forms. Below you will find the description of these antennas with different shapes.

1. Cylindrical antennas:

image from Wikiwand

These antennas have bend-in-one reflectors and planes in the other. The curved ends of the reflectors are covered with flat plates.

2. Shape of audio antennas:

image from VideoBlocks

The purpose of these antennas is to produce rays in the desired way. They produce sufficient beams.

3. Reflectors in shape:

image from HDTV Primer

Antennas with shaped reflectors are not cylindrical. Generally, these designs work well on radar aerials.

4. Coated Plate:

image from Qingtian Yoohon Technology Co., Ltd.

In this form a metal shield is connected to the edge of the cylindrical plate. The shield's role is to protect the antenna against radiation around the axis of the beam.

Finally, satellite dishes are also used based on their foods, such as axial feed, off-axis feed and cassegrain. This was a brief description of the applications of the parabolic antenna and how these antennas can be divided into different categories.


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