Decibel Relative to Isotropic Gain(dBi)
- Decibel Relative to Isotropic Gain (dBi) is a unit used to measure the forward gain of an antenna.
- Forward gain of the antenna is defined as the ratio of the signal transmitted in a single maximum direction compared to an isotropic antenna.
- dBi also reflects the antenna’s maximum efficiency in transmitting or receiving signals.
- It highlights a comparison between a real antenna and an isotropic antenna, which is a hypothetical antenna that radiates equally in all directions.
The formula to calculate the power gain of the antenna is
G(dBi) = 10 log(G)
where G(dBi) is the gain of an isotropic antenna and G is the comparison between a real antenna and an isotropic antenna (hypothetical)
Difference between dB, dBM and dBi
Decibel is the unit of sound intensity. It is the ratio of two physical quantities and then the logarithm of the ratio is taken. It is also used in electricity to measure current, voltage, and power.
Table of Content
- What is Decibel
- Decibel Milliwatts (dBm)
- Decibel Relative to Isotropic Gain(dBi)
- Difference between dB, dBm, and dBi
- Solved Examples on dB, dBm, and dBi
- dB, dBm, and dBi- FAQs