CWNA-109 · Question #40
When antenna gain is reported in dBi, the gain of the antenna is compared to what theoretical radiator?
The correct answer is C. Isotropic radiator. An isotropic radiator is a theoretical point source of electromagnetic radiation that radiates equally in all directions. It has no physical dimensions and no preferred direction of radiation. It is used as a reference for antenna gain because it represents the ideal case of a…
Question
When antenna gain is reported in dBi, the gain of the antenna is compared to what theoretical radiator?
Options
- AEnd-fire radiator
- BDipole radiator
- CIsotropic radiator
- DAnthropomorphic radiator
How the community answered
(27 responses)- B7% (2)
- C89% (24)
- D4% (1)
Explanation
An isotropic radiator is a theoretical point source of electromagnetic radiation that radiates equally in all directions. It has no physical dimensions and no preferred direction of radiation. It is used as a reference for antenna gain because it represents the ideal case of a perfect omnidirectional Antenna gain is a measure of how well an antenna concentrates its radiated power in a certain direction. It is expressed in decibels (dB) relative to a reference antenn a. When the reference antenna is an isotropic radiator, the antenna gain is denoted by dBi, which stands for decibels relative to isotropic.
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