In the field of electronics definition antenna is the "transformer / transmission structure between the guided wave (transmission line) with a wave of free space, or vice versa. Now the antenna is one important element that must exist on a radio telescope, television, radar, and all other communication devices that use signals. " An antenna is a vital part of a transmitter or a receiver that functions to channel radio signals to udara.Bentuk antenna in accordance with various kinds of designs, patterns of distribution and frequency and gain. The effective antenna length is the wavelength of the radio frequency it emits. Half-wave antenna is a very major ones because they are easily made and can radiate radio waves effectively.
Function
The function of the antenna is to convert electrical signals into an electromagnetic signal, then meradiasikannya (Disposal of electromagnetic energy to the air / free space). And conversely, the antenna can also serve to receive electromagnetic signals (Recipient of electromagnetic energy from free space) and convert it into electrical signals.
Character antenna
Radiation pattern
Antenna radiation pattern is to plot 3-dimensional distribution of the signal emitted by an antenna, or 3-dimensional plot of the level of reception signal received by an antenna. Radiasiantena pattern formed by two patterns based radiation field slices, namely in the field of radiation pattern slices elevation direction (elevation pattern) and the radiation pattern in the azimuth direction of the field slices (azimuth pattern).
Gain
Gain (directive gain) antenna is a character associated with the ability to direct antenna radiation signal, or receiving signals from a particular direction. Gain is not the quantity that can be measured in physical units in general such as watts, ohms, or other, but rather a form of comparison.
Polarization
Polarization is defined as the direction of propagation of the electric field. Dipole antenna has a vertical linear polarization. Recognizing the antenna polarization is very useful in communication systems, particularly to obtain maximum efficiency in signal transmission.
Create a wireless antenna
1. Omnidirectional Antenna
2. Sectoral Antenna
3. Grid Antenna
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