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Hi there,
I was searching myself for low-profile high-gain atnennas and I came through with the attached file. Matching impedance of this double-eight design is highly dependent of the gap (spacing) between the reflector plane and the actual radiating element.
Although I dont have a VSWR meter for 2.4GHz, practical measurements (against Lucent 24dBi parabolic grid) shown that making the gap 15mm results with the best performance (approx. 14dBi). Someone can safely say that this gap provides the construction with a impedance match somewhat near 50 Ohm.
Another interesting antenna design is the one the following link reffered to: f5ad.free.fr/ANT-QSP_F1AIA_Sextuple_Quad_2310.htm
In the near future, I will attach my USB client on the back of the reflector plane, thus making some short of embedded antenna. The only cable run to my desktop PC will be the USB cable itself. No RF cable, maximum EIRP. Check patraswireless.net/devices.html for more.
Regards
Kostas with PatrasWirelessNetwork
PS: Three more postes will be commited in order to send the pictures.
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