For a project I'm working on, I have a micro-controller situated inside a metal enclosure that is semi-open at the top. using ordinary omni-directional antennas (e.g. from Taoglas) I find that my device to the cellular network fairly reliably but it usually takes a long time to connect and it doesn't always work so well.
I have tested the same device under non-metal conditions and it didn't have these issues, supporting the idea that it's not the local signal strength or anything else that causes this, but the metal around the device.
What are my options for mitigating this issue? Installing the device and/or antenna outside the enclosure is out of the question for a multitude of reasons. Are there any ways to adapt the antenna so that it behaves better under these conditions (I know the properties and composition of the metal)?
In fact I have a similar device in my possession manufactured by a professional company, which I took apart, to take a look at. Their antenna is integrated into the PCB and appears to be a 2.5'' x 1.5'' omni-directional part, so clearly the technology for it exists.
Post some photos or diagrams so we can see what you are talking about.
Metal enclosures are anathema to wireless transmission. Put the antenna outside and well away from the enclosure. Or change to a plastic or wooden enclosure.
Robin2:
Post some photos or diagrams so we can see what you are talking about.
Metal enclosures are anathema to wireless transmission. Put the antenna outside and well away from the enclosure. Or change to a plastic or wooden enclosure.
Where certain specific properties have to be measured from the inside, with the top having to be sealed off (but with a non-metal material). Extended an antenna through the top isn't possible, and cutting through the material is an absolute no-go.
I have seen similar devices meant for an application like this, so I know it's possible. Perhaps it takes a very specific antenna design taking the properties of the material into account?
Perhaps it takes a very specific antenna design taking the properties of the material into account?
Of course it does. Antenna design is a very challenging subject and in your situation, it will take a custom antenna design to overcome the nearby conducting surfaces. It may not even be possible.
