Article published by : olive on Saturday, September 29, 2012 - Viewed 622 times

Category : Communications

The Popular WiFi Antenna

What is WiFi and WiFi Antenna?
We are familiar with WiFi in our lives because in today’s rapid development of wireless networks, antenna and its applications are increasing attention to the status of ways of building this kind of system to introduce WiFi antenna and its theoretical analysis in the process of setting technology requirements. WiFi is a kind of short range wireless transmission technology. Analysis and calculation of specific theories make WiFi antenna selection of shapes, sizes and materials, the concrete process of making WiFi antenna. And testing WiFi antenna performance, contrast with antenna system. Excuse making experience and production skills, this antenna simple in principle, make a highly successful. We need to use an for those computers that do not have an internal WiFi in order to connect to a wireless network. Without this antenna, the computer user will have to connect their computer to a modem, using a network cable, in order to access the Internet. If your computer doesn't have an internal WiFi antenna and you are needing to add an external WiFi antenna to your computer, you can do so without being a computer expert.

The Advantages of Parabolic Antenna
There are many kinds of WiFi antenna in the market. A parabolic dish antenna parabolic dish antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves. The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish. The main advantage of a parabolic antenna is that it has high directivity whose functions similarly to a searchlight or flashlight reflector to direct the radio waves in a narrow beam, or receive radio waves from one particular direction only. These offer some of the highest gains, that is they can produce the narrowest beamwidths, of any antenna type.[1] In order to achieve narrow beamwidths, the parabolic reflector must be much larger than the wavelength of the radio waves used, so parabolic antennas are used in the high frequency part of the radio spectrum, at UHF and microwave (SHF) frequencies, at which the wavelengths are small enough that conveniently-sized reflectors can be used. Parabolic antennas are used as high-gain antennas for point-to-point communications, in applications such as microwave relay links that carry telephone and television signals between nearby cities, wireless WAN/LAN links for data communications, satellite communications and space craft communication antennas. They are also used in radio telescopes.

The Other Large Use of Antenna
The other large use of parabolic antennas is for radar antennas, in which there is a need to transmit a narrow beam of radio waves to locate objects like ships, airplanes, and guided missiles. With the advent of home satellite television dishes, parabolic antennas have become a common feature of the landscapes of modern countries.

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By: olive

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Article ID 1003291 (Views 622)

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