On 09/05/2010 06:12 PM, Peter Krengel wrote: > Hello, > > I just did some experiments using a ceramic patch antenna inside a > small plastic (80 x 30 x 20mm) screw box and experienced much bader signals > at lower elevations. > The plastic is marked as PS (I guess polystyrole ?). Further experiments > covering a GPS with the same kind of box seemed to effect the signals > too. On the other hand covering the patch with a flat pcs of the same > material didnt effect the antenna. >
Finding a suitable top for that gps module/patch/.. that is both the right material and the right shape is hard. Just the right shape is much easier. So: I have had good success with vacuum forming such a beast. One particular glass cup I have in the kitchen is flat top conical, of just the right size. I put it on top of the ground plane, a 1mm sheet of clear polycarbonate above that, and with an air pump and heat gun I pulled the PC down around it. A bit of white paint on the inside, and it looks really good. /Kasper Pedersen _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
