Difference between dB, dBm, and dBi
dB | dBm | dBi |
---|---|---|
dB stands for Decibels. | dBm stands for Decibel Milliwatts. | dBi stands for Decibel Relative to Isotropic Gain. |
It is the measure of loudness. | It is a unit used to express decibels in milliwatts and is often used to measure the strength of the signal in wires and cables. | It draws a comparison between a real antenna and a hypothetical isotropic antenna. |
dB gives the ratio. | dBm gives absolute power. | dBi is used to measure the strength of the hypothetical antenna. |
Formula Lp = 10log10( P/P0) dB |
Formula S(dBm) = 10 log10 P |
Formula G(dBi) = 10 log(G) |
dB is used to measure sound intensity | It is used to measure small values and is used in wires. | dBi is used to measure the performance of the antenna |
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
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