Indoor coverage simulation
Place antennas on a floor plan, draw the walls, and see where the signal actually reaches — with the coverage area per point listed out.
Plan and floor plan
A CAD export or a photo of the plan. It is used as a backdrop only; the geometry comes from the numbers you enter.
Radio parameters
Walls
Tools
The bill of materials uses the Manhattan route from each cabinet to the points, with 30% allowance. Place a cabinet first and the feeder length becomes a real figure.
Click the plan to place an antenna (AP).
How this is calculated
ITU-R P.1238-8 multi-wall model: L = L0 + sum of wall losses, with L0 = 20log10(d) + 20log10(f) - 27.55 in dB. Each wall contributes min(n x d, N) where n is the attenuation per metre, d is the path length inside the wall and N is the material ceiling — the n and N values are from Table 3 of the recommendation. The path length inside a wall is the wall thickness divided by the sine of the angle between the path and the wall, so a diagonal crossing costs noticeably more than a perpendicular one; simplified tools often ignore this. Furniture, floors and reflections are not modelled. Use it to compare options and to get a starting point, then confirm on site.
Common questions
How is indoor signal coverage estimated?
With the ITU-R P.1238 multi-wall model: free space loss from the antenna to each grid point, plus the attenuation of every wall the path crosses. This tool evaluates a grid over the plan, draws the result as a heat map, and lists the covered area and the area each antenna serves.
How much does a concrete wall attenuate a signal?
ITU-R P.1238 gives concrete an attenuation constant of 2.4 dB per metre with a ceiling of 46 dB. Crossing 0.2 m of concrete normally costs well under a decibel; the cost grows steeply when the wall is thicker, when there are several walls in series, and when the path crosses the wall at an angle rather than head-on.
Does the angle at which a signal crosses a wall matter?
Yes, and it is the part simplified tools leave out. The path length inside the wall is the wall thickness divided by the sine of the angle between the path and the wall, so a diagonal crossing costs noticeably more than a perpendicular one. This tool computes the actual crossing geometry for every wall on every path.
What system insertion loss should I include?
The loss between the host output and the antenna port: the splitter, the feeder run and the combiner. In practice that is three to four decibels per splitter leg, around 0.35 dB per metre of half-inch feeder, and two to three decibels for the combiner. Leave it out and the calculated coverage radius comes out several times too large.
How many antennas does a floor need?
Roughly one per 150 square metres as a starting point, then adjust for the building. The scenario presets here use that density and add the typical walls for a shop, an office floor, a car park and an open campus so you have something realistic to start from.