Gary E. Miller via devel writes: > u-blox has an app note: > > https://www.u-blox.com/sites/default/files/products/documents/GPS-Antenna_AppNote_%28GPS-X-08014%29.pdf > > In Section 5.1.1 they recommend a 50mmm to 70mm square ground plane > under a patch antenna. They do not recommend anything larger then > 100mm (4").
That part of the app note is directed at passive antennas. The directionality should indeed change with the size of the ground plane even for active antennas, but at least with the two types of active patch antennas that I have used I've not seen a difference in performance with the size of the ground plane. There is an immediate drop in performance without a ground plane (well, not exactly without as these come with a plane about 2mm wider than the body of the patch antenna, but that's obviously too small for getting the full sensitivity). Anyway, putting a magnetic puck on the bottom of an emty can works just fine as does the scrap of aluminum foil. Regards, Achim. -- +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+ SD adaptations for Waldorf Q V3.00R3 and Q+ V3.54R2: http://Synth.Stromeko.net/Downloads.html#WaldorfSDada _______________________________________________ devel mailing list devel@ntpsec.org http://lists.ntpsec.org/mailman/listinfo/devel
