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 <[email protected]> To: [email protected] 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 _______________________________________________ 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. _______________________________________________ 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.
