Joined: 24 Jul 2012
|Posted: Tue Jul 24, 2012 2:32 am Post subject: questions about Cantenna for WiFi .11n
|... antenna noob here ...
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)?