What is DBI?

The abbreviation DBI is the degree of sound expressed as an acoustic or electrical force with respect to the isotropic radiator (I), measured in decibels (DB). It is usually used to express the antenna profit, which is a scale to which the antenna increases the effective power of the signal. Decibels are a logarithmic representation of size and are a convenient way to represent a large way that also corresponds to the large dynamic range of sounds that people can perceive.

DBI is expressed as a relative profit ratio. The reference standard is an isotropic radiator, a mathematically ideal antenna that evenly distributes energy in all directions. Expressing profit as a DBI ratio standardizes a comparison between different antennas. The focus aspect of the antenna is reflected in the increase in signal strength. The higher the DBI evaluation, the more the antenna preferably emits in a specific direction. The profit is directly related to the routing or directional properties of the antenna and is responsible for the efficiency of the antenna.

The antenna direction is a compromise between profit and the width of the antenna beam. The increase in profit is reflected in greater coverage in a specific direction, with an associated decrease in the area or the angle of coverage. The high -end DBI antennas must be carefully focused in the desired direction. The orientation of the low DBI antenna is not so critical because the antenna is close to radiating in all directions.

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high gain antenna has a narrow beam with good signal quality over long distances, but it is not an ideal application that requires reception through a large geographical area. Antenna with low DBI rating will have a shorter range with wider coverage. For example, most Wi-Fi antennas are low profit and may not be oriented in any particular direction with respect to the base station. Higher profit antennas can be useful for improving income in rural areas where the signal strength is weak.

profit is just one of the standarThe parameters used to measure the antenna performance. In addition to profit, engineers must consider frequency, bandwidth, impedance and polarization when selecting an antenna for a specific application. The durability of the antenna and its ability to handle extreme weather conditions can also be a problem. All other factors are the same, higher profit antennas are more expensive than antennas with lower profit.