Question
Download Solution PDFWhich of the following antenna is used as a standard reference for calculating directive gain?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
- The gain of an antenna is the ratio of the radiation intensity in a given direction to the radiation intensity that would be obtained if the power were radiated isotropically.
- The gain of an antenna takes the directivity into account.
- The term antenna gain describes how much power is transmitted in the direction of peak radiation to that of an isotropic source.
Isotropic source: It radiates equally in all directions.
Mathematically, the gain is defined as:
G = ηeD
ηe = Antennas efficiency
D = Directivity of the antenna
Since the value of ηe lies between 0 and 1, the directive gain of the antenna lies between 0 and the directivity of the antenna.
Directivity: The ratio of the radiation intensity in a given direction from an antenna to the radiation intensity averaged over all directions is termed as directivity.
Antenna's Efficiency: Antenna's Efficiency is the ratio of the radiated power of the antenna to the input power accepted by the antenna.
Last updated on Jul 2, 2025
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