Antenna :
1. To Transmit
and Receive Radio signal.
2. Size of
Antenna depends upon the frequency of the signal that the antenna is trying to transmit or
receive
3. Radio Signal
travels same as Speed of light is 3, 00 , 000
K.M per sec
4. Antenna is Measured
by Power Gain
5. Power Gain
measured by
- dBi - decibels relative
to an isotropic reference antenna
- dBd - decibels
relative to a dipole reference antenna
6.
Most
Wi-Fi antennas have dBi as their standard measure rather than dBd
Types Of
Wireless Antenna
- Omni Directional
- Directional
- Highly Directional
Omni Directional
Antenna:
This antenna is used to send
and receive transmissions from all directions. It does not require to point in
a particular direction, since its radiation is 360 degrees. Generally, it looks
like long flat sticks that act as a main antenna. This main antenna is used to
distribute signals to other computers and devices that include wireless
printers, PDAs, etc.
Directional
Antenna – Unlike
Omni Directional Antenna, this type of antenna is used to cover the signal in a
particular direction. It is available in different varieties such as the Yagi antenna, quad antenna, panel antenna,
billboard antenna, helical antenna etc. that can be used in variety of
applications. Yagi antenna has a great functioning as a wireless internet
connection, which is widely used in remote areas.
 |
| Quad Antenna |
 |
| Yagi Antenna |
 |
| BillBoard Antenna |
 |
| Helical Antenna |
Highly
directional Antenna :
Unlike
above mentioned types, Highly Directional Antenna offers numerous benefits. It
is most effective to cover the signals in one particular direction efficiently.
It contains two types of antenna- one is grid
antenna that can be seen on the top of television set and the other is dish shaped which is mainly used to
receive satellite TV stations.
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