Introduction to Receiving Antenna
To combine the transmitted RF waves and the receiver an instrument is essential. The received signal is processed to several actions and at last audio is obtained. For this reason an antenna is required.
As well in transmitters, it is essential to transmit the RF waves to space. So an antenna combines the transmitter and receiver.
Antenna is a lengthy rod that transforms energy, one form to other. Electrical signals are converted into electromagnetic waves if it is a transmitting antenna, and electromagnetic wives are converted into electrical signal if it is a receiving antenna.
In radar one antenna can work like both transmitting and receiving antennas.
The features of an antenna are considered as its reciprocity.
NECESSITIES OF AN ANTENNA
1. It receives the desire signals and should make essential signal voltage
2. It has to separate the desired signals from the not wanted signals
3. It has receives large bandwidth; it should be rotatable to receive signals from several stations.
CHARACTERISTICS OF AN ANTENNA
1. Directivity
2. Gain
3. Bandwidth
4. Impedance
DIRECTIVITY
This characteristics of an antenna which receives more signals is referred as directivity
GAIN
This characteristics of an antenna which provides more signal strength, is considered as gain. It relies on directivity.
BANDWIDTH
The range off frequencies of signal that can be received through an antenna efficiently is termed as band width.
IMPEDANCE
The ratio among the voltage acquired from full length of an antenna and current as impedance
TYPES OF RECEIVING ANTENNA
Within indoor antenna classified into two types
1. Indoor antenna
2. Outdoor antenna
INDOOR ANTENNA
Within indoor antenna few categories are there
1. V type antenna
2. Door frame type antenna
3. Inbuilt antenna
OUTDOOR ANTENNA TYPES
1. Dipole antenna
2. Folded dipole antenna
3. Reflector dipole antenna
4. Yagi antenna
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