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questions about Cantenna for WiFi .11n

 
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OldTechy
Antenna-Theory.com Newbie


Joined: 24 Jul 2012
Posts: 2

PostPosted: Tue Jul 24, 2012 2:32 am    Post subject: questions about Cantenna for WiFi .11n Reply with quote

... antenna noob here ...

background :
We utilize a wireless-bridge(DAP-1522) that provides excellent service ... most of the time!
We wish to improve on the service "reliability".

[note: optimized radio-settings for reliable AP-to-Bridge connection:
2.4Ghz, g/n mode, rate:AUTO, fixed Chnl:1, width:20Mhz, WPA2 ]

Based upon experiments and observations, it appears that the "bridge"
requires the occasional "reboot" due to "semi-periodic?", strong 2.4Ghz interference,
especially from nearby AP's introducing co-chnl interference.
(Chnl-1 was determined to be the "least-utilized" channel, most of time)

note: both the the AP and wireless-bridge are in static-locations ___
____ occasionally their positions, antenna orientations, etc. are re-optimized.

So, our project goal is to improve connection up-time (99.99995% ?).
Strategy : Minimize the effects of environment-interference in our "congested & saturated AP environment.
1) increased DIRECTIVITY (Narrow-Beamwidth,"waveguide", focus)
2) increase Dominance of preferred AP (higher-gain)
3) Attenuate/shield out the undesirable AP's.
4) DIY parabolic-reflector (dish/bowl @ bottom of can)
___ gain (constructive , resonance) ?

We are expeimenting with the Cantenna concept.
(see this link: http://forums.dlink.com/index.php?topic=50070.0)

The coffee-cantenna experiment was excouraging & demonstrated improved Wifi connection.
We will be proceeding to construct dual-cantennas and
modding the DAP-1522 wireless-bridge to accept the external-antennas.

I have about 1/2 million questions, but can I start with two ,,,?

A] question : are the external-antennas (i.e. rubber-ducky)
___ as provided by the WiFi device Mfctrs :
a) monopole or b) dipole c) maybe ?

B] Question : would the uW/RF-antenna physics suggest
that the 1/4 wavelength monopole-probe, would offer
improved Wifi signals/connection versus
a 1/2-wavelength dipole antenna.
(i.e. appropriately-sized, "rubber-ducky" inside-can)?

thanks
O.T.
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47777
Antenna-Theory.com Newbie


Joined: 08 Apr 2012
Posts: 4

PostPosted: Thu Oct 25, 2012 9:13 am    Post subject: Reply with quote

hi.

http://martybugs.net/wireless/rubberducky.cgi
some time small omni.


http://www.arrl.org/files/file/QEX_Next_Issue/Jan-Feb_2011/QEX_1_11_PASKVAN.pdf

you can make it longer!
http://www.lincomatic.com/wireless/homebrewant.html

most imp. dont invent.

use tp link 7200. [ better ]
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