Size of the Antenna or Aerial – Class 12 | Chapter – 15 | Physics Short Notes Series PDF for NEET & JEE

Size of the Antenna or Aerial: The size of the antenna or aerial depends on the wavelength of the signal it is designed to transmit or receive. The general rule is that the length of the antenna should be approximately equal to or a multiple of the wavelength of the signal.

For example, if the signal wavelength is 1 meter, the ideal antenna length would be 1 meter or a multiple of 1 meter, such as 2 meters, 3 meters, and so on. This is because the antenna needs to be resonant with the signal wavelength to efficiently transmit or receive the signal.

Importance of Size of the Antenna or Aerial

The size of the antenna or aerial is important for several reasons:

• Efficient signal transmission: The size of the antenna determines its resonant frequency, which is the frequency at which the antenna is most efficient at transmitting or receiving signals. If the antenna is not the correct size, it may not be able to efficiently transmit or receive signals, resulting in poor performance.
• Gain: The size of the antenna also affects its gain, which is a measure of the antenna’s ability to direct or receive signals in a particular direction. A larger antenna generally has higher gain, allowing it to transmit or receive signals over longer distances.
• Interference: The size of the antenna can also affect its ability to reject unwanted signals, such as interference from other nearby sources. A properly sized antenna can help reduce interference and improve the signal-to-noise ratio.
• Compatibility: In some cases, the size of the antenna may be determined by compatibility requirements, such as when designing an antenna for a specific communication standard. For example, a cellular phone antenna must be designed to be small enough to fit in the device while still providing adequate performance for the specific frequency bands used by the cellular network.

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By Team Learning Mantras