正解:A
The radiation pattern depicted in the exhibit is characteristic of an omnidirectional antenna. This type of antenna radiates or receives signals uniformly in all directions on a horizontal plane, which is evident from the circular Azimuth Pattern. The Elevation Pattern also suggests a broad, uniform coverage, which aligns with the properties of an omnidirectional antenna. These antennas are commonly used in scenarios where a
360-degree coverage is required, such as in wireless local area networks (WLANs).