Basic Theories of Radio Waves - Wireless LAN

Basic Theories of Radio Waves - Wireless LAN

 Admin Minggu, 01 Juli 2012 Computer Networking, Tips Tricks
In Wireless LAN technology we will find terms such as frequency, channel, band and so on. The Notes on Basic Theory of Radio Waves hopefully can help us to understand those terms.

Basic Definition of Waves

A wave is the vibration (or oscillation of a periodic back and forth movement) that propagates. The ideal shape of a wave will follow the sinusoide motion. Examples are waves on the beach.

Various Waves

In general, the wave is divided into two, namely:
Mechanical waves.
That is a wave that requires a medium or an intermediary, for example such as sea water waves, pda waves and sound waves.
Electromagnetic Waves.
Is a wave that does not require a medium or an intermediate in its propagation. Examples are gamma rays, x-rays, ultraviolet light, infrared light and radio waves.

Frequency and Wavelength

In electromagnetic waves there are several parameters that can be measured, namely the wavelength (wave length), frequency and speed.
Wavelength (λ) is the distance traveled by wave in 1 period. Or the distance of one hill one valley. The wave of seawater as it approaches the coast will change its wavelength.
Frequency is the number of waves passing through a point in a single unit of time. Suppose to reach a certain distance, the wavelength, the lower the frequency. And conversely, the shorter the wave, the higher the frequency it takes.
Speed ​​= Frequency * Wavelength
Speed ​​is usually measured in meters per second, the frequency is usually measured in vibrations per second (or Hertz, which is short in Hz), and the wavelength is usually measured in meters.
Understanding Bandwidth

Bandwidth or Bandwidth in communication technology is the difference between the lowest frequency and the highest frequency within a certain range. For example, the phone line has a bandwidth of 3000Hz (Hertz), which is the range between the highest frequency (3300Hz) and the lowest frequency (300Hz) that this phone line can pass.
Bandwidth is the wide or wide range of frequencies used by signals in the transmission medium. Bandwidth is the width of the data channel passed by the data transferred.

In the Computer network, the term Bandwidth is also often used as a synonym for data transfer rate ie the amount of data that can be brought from one point to another within a given time period (generally in seconds). This type of bandwidth is usually measured in bps (bits per second) or Bps (bytes per second).

Spectrum Electromagnetic Waves

Electromagnetic waves include frequencies, as well as wavelengths, which are very wide. These frequencies and wavelength regions are often referred to as the electromagnetic spectrum. The part of the electromagnetic spectrum that many people recognize is light, which is part of the electromagnetic spectrum seen by the eye.

Radio Band and ISM Band

The radio uses a portion of the electromagnetic spectrum in which the wave can be generated by inputting alternating current to the antenna.

Band is a small part of Spectrum radio communication frequency. The band names contained in this radio frequency spectrum

Spectrum frequencies within bands made open for general use are known as ISM Bands (short for Industrial, Scientific, and Medical).
The most extensive Wi-Fi version in the US market today (inside IEEE 802.11b / g) at 2,400 MHz to 2,483.50 MHz. By perfectly allowing operations in 11 channels (5 MHz each), brochures at the following frequencies:
_http: //
_http: //
_http: //
_http: //, etc.

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