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GM7HUD > TECH 14.08.04 00:48l 39 Lines 1402 Bytes #999 (0) @ WW
BID : A41522GM7HUD
Read: GUEST
Subj: Re: 13cms Yagi from Pringles Can
Path: DB0FHN<DB0FOR<DB0MRW<DB0RGB<OK0PPL<DB0RES<DK0WUE<HA3PG<7M3TJZ<E20LAL<
WB0TAX<GB7ESX
Sent: 040813/2101z 74052@GB7ESX.#31.GBR.EU $:A41522GM7HUD [Witham, Esx]NNA V3.1
> 2.4 GHz Pringles Can Yagi Antenna (12-15 dBi)
The Pringle Can Antenna is a lousy antenna for Wifi.
Some interesting results for open range testing of some 2400MHz antennas
for WiFi is available.
Antenna Gain (dbi)
======= ==========
Original CNN Hacking Pringles Antenna <-16
Optimised Pringles Antenna -8.2
Bare probe from Pringles design +1.2
16 turn helix 2.8db axial ratio +13.2 (dBiC)
This shows that just the probe gives 15dB more gain than the whole antenna.
If you look at the results for 3456MHZ you'll find the following
Antenna Gain (dbi)
======= ==========
Original CNN Hacking Pringles Antenna +5.8
Optimised Pringles Antenna +7.8
These figures confirm that the Pringles Antenna design is far too small for
use on 2400MHz.
So why do people build the Pringles Antenna? Well it is directional and in
many cases the improvement in performance people claim may well be more
down to reducing unwanted signal pickup when moving from omni to
directional antennas.
If you want to improve your Wifi then consider building an antenna that is
the correct size for 13cms/Wifi. There are many designs available and you
may want to try http://www.seattlewireless.net/?CookieCantenna which claims
15-18dB (doesn't say which, lets be pessimistic and say dbi).
73 de Andy GM7HUD
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