An omndirectional antenna is _____________ antenna.Select one:a. point source. b. yagi uda antenac. Half wave dipoled. isotropic

An omnidirectional antenna is best described as an isotropic antenna. Isotropic antennas are theoretical point source antennas that radiate power uniformly in all directions in three-dimensional space. However, in practical applications, an omnidirectional antenna radiates signals uniformly in a horizontal plane while often having some directional characteristics vertically.

Explanation:

1. Point Source: This refers to a source that emits energy equally in all directions, which aligns with the concept of an isotropic antenna.
2. Yagi-Uda Antenna: This is a directional antenna, meaning it focuses its energy in a specific direction, unlike an omnidirectional one.
3. Half Wave Dipole: While it radiates in a figure-eight pattern and can be considered omnidirectional in the horizontal plane, it does not fit the definition of isotropic in a strict sense because it has better performance at certain angles.
4. Isotropic: By definition, an isotropic antenna would radiate equally in all directions, making it the most accurate term to describe an omnidirectional antenna.

Final Answer

Omnidirectional antenna is an isotropic antenna.