Problem with connection when i cover the circuit with hand

RE: Problem with connection when i cover the circuit with hand

Kenneth — Tue, 03 Nov 2020 09:57:19 GMT

It may be possible to adjust the antenna, however if you have bought a module from a third party, then this module is likely pre-certified/pre-qualified, it may be difficult to do changes then. So in that case I recommend to check with the vendor of the module to make sure you have mounted their module according to their specifications. It can be a tremendous difference in performance if you have not followed their guidelines.

RE: Problem with connection when i cover the circuit with hand

Paolo — Mon, 02 Nov 2020 20:41:32 GMT

We try with more power, and is going better.. but we need more efficiency!

RE: Problem with connection when i cover the circuit with hand

Kenneth — Mon, 02 Nov 2020 15:35:03 GMT

You may check with the vendor of the module in terms of placement and where/how they recommend placement relative to the human body, casing and motherboard.

It's very little that can be done in SW here, you may increase output power if you haven't.

Best regards,
Kenneth

RE: Problem with connection when i cover the circuit with hand

Paolo — Mon, 02 Nov 2020 13:43:32 GMT

Ok about tuning. Please let me know if tuning can be done by firmware or we need to modify the antenna.
We are usind ISP module that is based on Nordic IC, that means that we cannot work on antenna directly, but only by SW.

RE: Problem with connection when i cover the circuit with hand

Kenneth — Mon, 02 Nov 2020 12:47:50 GMT

The device's antenna must be tuned where it is intended to used, the plastic casing must be available to do this tuning. If you take a board and shield in your hand without tuning and no plastic, then it won't work no. The human body is an efficient blocker for 2.4GHz, so it will mostly rely on reflections from surroundings if you plan to place it on the human body and there is no line of sight to the peer. So it is important that the board have been properly reviewed and tuned with prototype plastic. This is something we can help you with if you create a confidential case and ask for a layout review as a first step.

RE: Problem with connection when i cover the circuit with hand

Paolo — Mon, 02 Nov 2020 09:55:34 GMT

How can i fix that? We are working on a body patch that is not completely covered
by human skin. Only one side is attached on the skin. The other part is free.

RE: Problem with connection when i cover the circuit with hand

awneil — Mon, 02 Nov 2020 00:39:32 GMT

[quote userid="88171" url="~/f/nordic-q-a/67869/problem-with-connection-when-i-cover-the-circuit-with-hand"]why this happens[/quote]

Water is excellent at blocking transmission of 2.4GHz.

Your hand is around 60% water