2.4Ghz vs. 5GHz antenna

[William Park]

I'm sort of limited to what I can buy.  The new dual-band adapter came
with antennas that looked exactly like the antenna on my old Wireless-G
adapter.  That's why I thought I could use 2.4GHz external antenna.

Moving my tower into open space and pointing its back towards the router
(D-Link DIR-655, which is B/G/N300 router), I get the same problem
regardless of antennas.
-- 
William

On Mon, Sep 03, 2012 at 03:39:38AM +0000, faisal-nMFrlatgk0VeoWH0uzbU5w at public.gmane.org wrote:
> 
>    William,
>    So a normal antenna for any frequency will be of a harmonic fraction of
>    the wavelength of the signal.  For best performance you'd want a 1/2
>    wavelength antenna.
>    For 5.4 GHz, the wavelength is 6cm.
>    For 2.4 GHz, the wavelength is 12cm.
>    http://www.csgnetwork.com/freqwavelengthcalc.html
>    So a 2.4 GHz antenna that is say, a 1/2 wavelength antenna should work
>    well as a 1/4 wavelength antenna.
>    A dual-band antenna is one where it is usually about 1/2 wavelength of
>    the lower frequency but has an inductor in between to deal with the
>    higher frequency.
>    If you are seeing disconnections, look at where your router is situated
>    before playing with antennae.  Also, look for things that may interfere
>    with signals inbetween the router and the client device you're
>    connecting with.
>    There are many factors to the performance including the routers
>    overheating.
>    Personally I have two problems, overheating and my brother using up all
>    my bandwidth.  Neither of which is a signal issue. :(
>    I hope this helps,
>    Faisal
> 
>    On Sep 2, 2012, William Park <opengeometry-FFYn/CNdgSA at public.gmane.org> wrote:
> > 
> >      Hi,
> >      Question:
> >      Is there practical difference between antenna on 2.4GHz
> >      adapter/router and antenna on dual-band 2.4GHz-5GHz adapter/router?
> >      Problem:
> >      I have Linksys WMP-600N PCI adapter (dual-band) which keeps losing
> >      connection. Because of physical contraints, I've replaced its 2
> >      antennas with external antennas (TP-LINK TL-ANT2408C) whose specs
> >      say 2.4-2.4835GHz. I couldn't find anything that says 5GHz or
> >      dual-band. Maybe, I'm using "wrong" kind of antennas?
> >      --
> >      William
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