[SI-LIST] Re: 2.4 GHz antenna - metal case related (non?) issues
- From: steve weir <weirsi@xxxxxxxxxx>
- To: dp@xxxxxxxxxxx
- Date: Thu, 03 Jan 2008 07:14:53 -0800
Dimiter figuring out the actual power loss is a good application for one
of the available 3D field solvers. If you are going to locate the
antenna beneath a slot, you could start to estimate by calculating the
incident power on the slot, and then looking up or calculating the
insertion loss of a slot antenna of the dimensions you propose.
The one caution I offer for the keyboard location is that all that sea
water in your user's hands is pretty good at absorbing 2.4GHz.
Steve.
Dimiter Popoff wrote:
> Not being an RF person I hope someone on this list would be
> able and willing to comment on that.
>
> I am about to build in a Bluetooth and/or a wifi module in a
> small device which will be in a metal (0.5mm brass) case;
> it looks more or less like a tiny laptop.
> The surface where the keyboard of a laptop would be located
> will not be metal, it would be fair to assume it to be
> a 4 layer PCB.
> I am eyeing an NSC module - LMX9838 - which comes with its
> antenna included and everything. I know I cannot put that
> inside the metal case (even though I am non-RF... :-) ),
> but I wonder if I can get away with putting it just under
> the PCB closing the "keyboard" side - having etched all metal
> over it? If this would work, how much an opening do I need?
> How much degradation - roughly estimated, obviously - would
> that result into?
> Another chance I see is to place the module - it is a tiny
> 10x17 PCB, antenna included in one edge of its board - so
> that it would close a hole of its size (somewhat larger)
> in the case. That would leave it open from one side and
> totally closed at the other. How about this? Might be a bit
> better than beneath the PCB...
>
> Thanks for any insight,
>
> Dimiter
>
> ------------------------------------------------------
> Dimiter Popoff Transgalactic Instruments
>
> http://www.tgi-sci.com
> ------------------------------------------------------
>
> http://www.flickr.com/photos/didi_tgi/sets/72157600228621276/
>
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