beamwidth的意思|示意

Beamwidth is an important concept when working with antenna radiation patterns. Rightly defined, it is the angular distance between the two half-power (-3dB) points of the main lobe of the antenna’s radiation pattern in a particular plane. Beamwidth is typically measured in the horizontal plane and is expressed in degrees.

Beamwidth is important because it determines the width of the main lobe of the antenna’s radiation pattern. Narrow beamwidths create a focused main lobe that provides a high gain angle of transmission, while wider beamwidths create a broadened main lobe with a lower gain angle of transmission. This is particularly useful for applications where the antenna needs to be directed at a particular area, such as broadcasting, or when it needs to be focused on a particular object, such as a satellite.

Beamwidth is also important for antenna design. Many antenna designs trade off gain for beamwidth. That is, the higher the gain of the antenna, the narrower the beamwidth will be. This is because the higher gain requires more focused energy, which requires a more concentrated main lobe. This can be seen in many types of antennas, such as dipole and Yagi-Uda antennas.

In summary, beamwidth is an important concept when working with antenna radiation patterns. It is simply the angular distance between the two half-power (-3dB) points of the main lobe of the antenna’s radiation pattern in a particular plane. Beamwidth is important to determine the width of the main lobe of the antenna’s radiation pattern, which is useful for applications where the antenna needs to be directed at a particular area or object. Beamwidth is also important for antenna design, as many designs trade off gain for beamwidth.