Hamina Attenuation Object Library
Hamina is a wireless design platform for planning and validating Wi-Fi networks from a floor plan. Its automatic wall detection is genuinely good — point it at a drawing and the walls come out the other side.
Attenuation objects are the other half of a model: the cupboards, desks, racks and shelving that sit between an access point and a client. Those still get drawn by hand. Placing an object involves far more variables than tracing a wall — which way it faces, what is inside it, whether the shelf is full or empty — and the automation is not there yet.
Until it is, here are pre-drawn objects from me and from other people in the community, ready to drop into a design. There is real value in showing a populated building rather than an empty one: a customer who can see the desks and the racking reads the room the way you do, and understands why coverage behaves the way it does.
Objects here all face the same way. To turn one to the angle you need, resize it, or change what a part is made of, open the Hamina Attenuation Object Editor — paste, adjust, copy back out. Shop for the object here; shape it there.
Hit copy on any object. The clipboard gets a complete HaminaClipboard document.
Paste straight into Hamina with Ctrl+V, or through the object editor first to rotate, resize or retune it.
Drag it into place, delete parts you do not need, then tune the loss per metre against your own survey data.
Materials and loss
Where a part is thin — a steel panel, a glass door — the figure is the material’s own. Where a volume is a mixture of material and air — a loaded pallet bay, a rack of equipment, a canopy — it is a bulk figure. Every row says where its number came from; hover a source for the reasoning behind it.
| Material | dB / m | Source | Used by |
|---|
They are quoted for 5 GHz. Loss varies with frequency, moisture, construction and how full the thing is; a stocked pallet bay and an empty one are different objects. For a result you can rely on, measure the real material on the real site. If you do, send the number over and the library will be corrected with your name on it.
Hamina’s own presets, for reference
What the tool ships with, so you can see which figures here are borrowed and which are not. Zones are quoted per metre of path. Walls are quoted as a flat loss for crossing the wall, which is the important difference — a wall is thin, so a per-metre figure would produce almost nothing.
Attenuation zones
| Preset | Height | dB / m |
|---|
Walls
| Preset | Height | dB |
|---|
Licence
The objects, their descriptions and their drawings are published under Creative Commons Attribution 4.0 International. Use them commercially, change them, build on them — just credit the source if you republish the objects themselves. Dropping one into a survey or a client deliverable needs no credit at all.
Objects contributed by other people carry the same licence. Contributors agree to a short set of terms before submitting, and are credited by name on every object they send.
If you do need an attribution line:
Attenuation objects by Robin Decloedt (robinwifi.eu), CC BY 4.0
The plugin behind this page is separate and is GPL-2.0-or-later.