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The IBGE Outdoor method is derived from the CSTB 2016 method.

The IBGE Indoor method corresponds to the Outdoor method without the final reflection on the building facade. To convert an outdoor calculation to an indoor calculation, a fixed attenuation factor is applied. This factor depends on the facade material.

 

The IBGE Outdoor and IBGE Indoor methods include the following modifications:

•Replacement of the 3H near-field region by a fixed distance of 2 m.

•Use of the Atoll method for the 3D pattern reconstruction method.

•Search for the rear maximum gain in 3D over a subpart of the back hemisphere (located behind the antenna), limited to a solid angle of "pi" steradians (i.e. with the azimut range from 120° to 240° in the horizontal plane, excluding grazing directions lower than 30° to account for walls thickness)

In the IBGE method there is no real near field computation. When the receiver is located beyond a 2m distance from the antenna center, far field formulation is used (pour une antenne de 2m c'est un peu osé, mais bon). Within the 2m distance, the computed electric cannot be larger than the maximum value computed on the subpart of a back hemisphere with a 2m radius. But it can be lower (depending on the receiver location and direction relative to the antenna).