[time-nuts] GPS ceramic patch in what plastic housing?

[Stanley Reynolds]

The plastic may also function as a lens particularly the corners of the box
see:

http://authors.library.caltech.edu/10409/1/ZMUieeetmtt92.pdf

figure 2 shows a polyethylene lens.

Stanley

----- Original Message ----
From: Peter Krengel <krengeldatec at gmx.de>
To: time-nuts at febo.com
Sent: Sun, September 5, 2010 11:12:05 AM
Subject: [time-nuts] GPS ceramic patch in what plastic housing?

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. 

Is there possibly a cavity effect?

What to take best?

Any ideas?


Thank you

Peter, DG4EK
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