Definitions of Antennas:
The following are the definitions of antennas:
Definition 1: The basic definition of an antenna is, it is a metallic device in the form of either wire or rod used for radiating or receiving radio waves.
Definition 2: According to the IEEE standards definition of terms of the antenna, an antenna is aerial and is the means for radiating or receiving radio waves.
Definition 3: The antenna produces electromagnetic fields and these fields constitute electromagnetic waves. Thus antenna can be defined as the source or radiator of electromagnetic waves.
Definition 4: An antenna can be used to sense the electromagnetic waves. Hence it can be defined as a sensor of electromagnetic waves.
Definition 5: An antenna can be defined as a transducer that converts radio frequency electrical current into an electromagnetic wave of the same frequency as that of an electrical current.
Definition 6: An antenna act as a coupling device between a generator or transmitter and free space. Hence antenna is an impedance matching device between free space and transmitter line.
Properties of Antennas:
Irrespective of the types of antenna, every antenna possesses similar properties:
1.Equality of impedance:
An antenna should have equal impedance. That means the impedance for transmitting must be equal to the impedance of receiving. This property is called equality of impedance.
2.Equality of directional patterns:
An antenna exhibits identical directional pattern whether it is used for transmitting or receiving purposes. This property is known as equality of directional pattern.
3.Equality of effective length:
An antenna's effective length should be the same for the transmission as well as for the reception.
Disclaimer:
I have created this blog for educational purposes, so for that, I have written the content by referring many books, web pages. I have also uploaded google images for a better understanding of the concept and I would also like to inform you that I am not responsible for the ads which are being posted on my blog.
Disclaimer:
I have created this blog for educational purposes, so for that, I have written the content by referring many books, web pages. I have also uploaded google images for a better understanding of the concept and I would also like to inform you that I am not responsible for the ads which are being posted on my blog.
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