Radio Mobile - RF propagation simulation software |
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dBidBi is decibel above the gain of a isotrope
antenna as a reference.
The isotrope
antenna is a mathematical antenna with a radiation pattern of a perfect
sphere. From this background it is calculated that a dipole
antenna has a gain of 2.15 dB referenced to the isotrope
antenna.
- A dipole has a gain of 2.15
dBi
- A dipole has a gain of 0 dBd
- In
the case of a yagi antenna with a gain of 14 dBd the
yagi has 14 dB
more gain as a dipole.
- the same yagi has
a gain of 16.15 dBi
dBi is used for mathematical
purposes and by commercial guys who want to add 2.15 dB more gain to
the antenna they sell :-)
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