[Tinyos-help] Antenna gain on tmote

[Terence Joseph]

Hi Joe,

The radiation patterns given in the data sheet appear to be taken from 
http://www.chipcon.com/files/CC2420DBK_User_Manual_1_3.pdf.  However, in 
this document they claim a gain of -5dBi for the antenna.  Can you explain 
the discrepancy please?  Has it something to do with a difference in 
impedance matching?

Best Regards,
Terence


>From: "Joe Polastre" <joe at polastre.com>
>To: "Matt Thompson" <matt.thompson at lochisle.com>
>CC: tinyos-help at Millennium.Berkeley.EDU
>Subject: Re: [Tinyos-help] Antenna gain on tmote
>Date: Tue, 18 Jul 2006 11:03:04 -0700
>
>Tmote Sky's antenna has about a 1-3dBi gain.  Impedance matching is
>tough, and it took a few tries for us to get the right match.
>
>-Joe
>
>On 7/18/06, Matt Thompson <matt.thompson at lochisle.com> wrote:
>>Hi,
>>
>>Does anyone know the dBi gain of the PCB antenna on the tmote sky
>>modules??  We have layed out a board with fractus 1dBi gain antennas,
>>and we're not getting close to the range of the tmote antennas.  Trying
>>to figure out if this is due to lack of gain, or other
>>design/manufacturing issues (unmatched impedance).
>>
>>Cheers,
>>Matt
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>>Tinyos-help mailing list
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