Omni Directional Antenna
Omni directional antenna
The omni directional antenna is an antenna system that radiates power
uniformly in all directions. The only 3 dimensional omni directional
antenna is the isotropic antenna, a hypothetical construct derived from
actual antenna radiation patterns and used as a suggestion for
specifying antenna gain and radio system effective radiated power.
Practical antennas approach omni directionality by providing uniform
radiation or reaction only in one reference plane generally the
horizontal one parallel to the earth's surface.
Common omni directional antennas are the belt antenna, a vertically
orientated dipole antenna, the discoing antenna and the horizontal loop
antenna. An omni-directional antenna broadcasts in all orders, outward
from the antenna. So only one part of the signal reaches the receiver,
the rest is just sent out into space. The idea is easy to understand if
used a picture of a fountain.
Work of omni antenna:
Omni-directional antennas are used in many applications but until
nomad, they were the only way a moving automaton could send
information. Nomad uses an omni-directional antenna to send and receive
low-level communications, like commands. It cannot use this antenna to
send complex pictures from the panospheric camera because it cannot
send enough information rapidly enough with it. But the
omni-directional antenna is still the robots major communication for
basic tasks.
Wide discursion:
Omni-directional antennas are generally used for point-to-multipoint
network. They increase the transmitting power, receiving sensitivity in
one plane at the expense of the same in another. To imagine what
happens when one attach an omni-directional antenna, start with a stock
base station. A stock base station has an isotropic transmitter or
receiver built into it. Tentatively, if ABS is suspended in a
three-dimensional space that the coverage would resemble a sphere with
the ABS at its middle. Enter the sphere and one can get coverage, exit
it and there will be no coverage.
In certainty, the limitations of antenna design, intervention.
Generally result in somewhat less uniform coverage. An omni-directional
antenna will mainly compress the sphere. So, as the range in one flat
is increased, the range in another will suffer. The gain of
omni-directional antennas is usually specified in the horizontal and
the vertical planes. While the horizontal coverage increases with the
gain of the antenna and the vertical coverage decreases.
More Articles on Antenna
Choosing Right Direction For Antenna
Vehicle Based Satellite Antenna
Related Products And FREE Videos on Antenna
More Articles on Antenna
Installing A Television Antenna
... this line of sight tend to weaken and degrade the received signal. The signal also becomes weaker as it travels further from the transmitting tower. All of this means that in difficult and distant receiving situation a higher gain antenna may be required. Gain is one measure of an antenna's ability to ...
... boosters. They are channelized and non-channelized boosters. The fixed gain boosters are non-channelized boosters. In this type of boosters the power and gain levels are set to meet specific or unusual requirements. The automatic gain adjusting boosters sets the gain over a wide rage of input signal levels. ...
... direction of the loop. In the spiral form the antenna is wound up parallel to the loop s diameter. This will make the each and every loop smaller. A loop needed to rotate to null out the signal. Size of the loop will determine the number of turns. Smaller loop will require more loops and vice versa. The ...
Right Location Of Television Antenna
... wonderful difference in the success of the antenna installation. Digital television is a little different than analog TV. With analog TV climax signal strength was the most important factor for good reception and creating a good picture. With digital TV peak signal strength is not the most important factor ...
... resistance, flexible polyethylene boot covers to protect the connections from the weather. There are many size and shapes of multi directional antennas. They are designed to suit the locations. Some of the medium directional antennas can receive and demodulate clear analog broadcast signals and DTV/HDTV ...