[SI-LIST] Re: 2.4 GHz antenna - metal case related (non?) issues
- From: Dimiter Popoff <dp@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 3 Jan 2008 18:07:32 +0200
Based on two private replies I got, I put a drawing of the
NSC module in question (LMX9838) at http://tgi-sci.com/misc/lmx9838d.gif .
This should make it easier to guess antenna type etc., I guess.
Another thought I have is to leave the antenna - which seems to be
the module area without soldering pads at one end, something like
6 x 10 mm - show out of the case. That is, the pad area gets soldered
to the board inside the case, at its very end, and the opening in
the metal case gets perhaps somewhat larger and gets covered by
some plastic cover. Does this sound better than the other options?
Dimiter
------------------------------------------------------
Dimiter Popoff Transgalactic Instruments
http://www.tgi-sci.com
------------------------------------------------------
http://www.flickr.com/photos/didi_tgi/sets/72157600228621276/
> To: <si-list@xxxxxxxxxxxxx>
> From: Dimiter Popoff <dp@xxxxxxxxxxx>
> Subject: 2.4 GHz antenna - metal case related (non?) issues
> Date: Thu, 3 Jan 2008 15:22:55 +0200
> X-relay: mail.tgi-sci.com
>
> 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/
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
