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Thread: Wireless Router High Gain Antenna

  1. #1
    AB9IL
    Guest

    Wireless Router High Gain Antenna

    Recently I had a need to get substantial improvement in my wireless
    router's performance, and thought a yagi antenna would help. Whoa! It
    did indeed help, so I have posted some pictures and a short how-to on
    the web at:

    http://www.ab9il.net/wlan-projects/wifi7.html

    It is the same 15 element yagi used for extending the range of USB
    wireless adapters, but connected via pigtail to a router. I can now
    connect indoors through concrete and plaster walls or provide wi-fi
    connectivity to laptop and Ipod touch users up to 300 meters away, in
    the presence of interference.

    Maybe it can help some of you trying to cover some large areas with
    your routers.

    Phil AB9IL

  2. #2
    me here
    Guest

    Re: Wireless Router High Gain Antenna

    AB9IL wrote:

    > Recently I had a need to get substantial improvement in my wireless
    > router's performance, and thought a yagi antenna would help. Whoa! It
    > did indeed help, so I have posted some pictures and a short how-to on
    > the web at:
    >
    > http://www.ab9il.net/wlan-projects/wifi7.html
    >
    > It is the same 15 element yagi used for extending the range of USB
    > wireless adapters, but connected via pigtail to a router. I can now
    > connect indoors through concrete and plaster walls or provide wi-fi
    > connectivity to laptop and Ipod touch users up to 300 meters away, in
    > the presence of interference.
    >
    > Maybe it can help some of you trying to cover some large areas with
    > your routers.
    >
    > Phil AB9IL



    The only downside is that the router yagi will concentrate the signal
    path over about 30 degrees, which greatly restricts the coverage the
    access point is able to provide.

    I have also played about with this type of antenna and you might find
    my write up of interest - refers to a $25 cheap Chinese yagi compared
    to other antenna types.

    http://users.picknowl.com.au/~gloaming_agnet/ant1.html

    Hardly worth trying to make one at that price.


  3. #3
    u
    Guest

    Re: Wireless Router High Gain Antenna

    AB9IL <ab9il.worldwide@gmail.com> wrote in news:3a461770-4d5e-41cd-b243-
    b0dfa9a8331f@k18g2000prf.googlegroups.com:

    > http://www.ab9il.net/wlan-projects/wifi7.html
    >


    The record was set using 2 parabolic dish reflectors, as I recall over
    100km at both ends. Dish reflectors by design I think provide the largest
    gain but are difficult to aim. I am using a homemade 1/2 parabolic to focus
    the signal onto a 5 inch wubber duckey antenna that came with my USB radio.
    Works fine, no need to purchase manufactured antennas for the home user
    just wanting to connect to the net.

  4. #4
    me here
    Guest

    Re: Wireless Router High Gain Antenna

    u wrote:

    > AB9IL <ab9il.worldwide@gmail.com> wrote in
    > news:3a461770-4d5e-41cd-b243-
    > b0dfa9a8331f@k18g2000prf.googlegroups.com:
    >
    > > http://www.ab9il.net/wlan-projects/wifi7.html
    > >

    >
    > The record was set using 2 parabolic dish reflectors, as I recall
    > over 100km at both ends. Dish reflectors by design I think provide
    > the largest gain but are difficult to aim. I am using a homemade 1/2
    > parabolic to focus the signal onto a 5 inch wubber duckey antenna
    > that came with my USB radio. Works fine, no need to purchase
    > manufactured antennas for the home user just wanting to connect to
    > the net.


    That's right.

    There are certainly plenty of cheap and very effective options out
    there.

    I haven't tried the half parabola yet, but it should be pretty similar
    to a corner reflector I expect.

    The salad bowl/wire strainer also works better than it deserves to :-)

    I often hear 3G net users whinging about their lousy reception, yet
    when you try to explain how they could easily overcome it by putting
    their adapter on an extension cable and using some sort of reflector,
    they just look at you like you're mad.

    I wouldn't mind trying out tis item on Ebay - cheap and interesting.

    Item number: 280466040537

    Anyone used one yet?



  5. #5
    Jeff Liebermann
    Guest

    Re: Wireless Router High Gain Antenna

    On 26 Feb 2010 11:08:14 +1100, "me here" <gloaming_agnet@hotmail.com>
    wrote:

    >I wouldn't mind trying out tis item on Ebay - cheap and interesting.
    >Item number: 280466040537
    >Anyone used one yet?


    Nope, but the design is fairly common. However, I see a few problems.
    <http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280466040537>
    The copper part of the PCB is facing the ground plane, which means
    that the RF has to go THROUGH the FR4 substrate. That's good for
    about 2-3dB of loss. In other words, the picture shows that it's
    being built with the PCB reversed.

    Then antenna is 4ea patch antennas with two power splitters. A single
    patch is good for about 8dBi of gain. Every time you double the
    number of patches, the gain increases 3dB. So, a 4 patch antenna will
    be 8+6=14dBi. However, that doesn't take into consideration the power
    divider losses of roughly 1dB per division. There are 3 of these in
    this antenna, resulting in a total gain of about 11dBi. The coax
    cable adds even more loss.

    So, if we give it about 11dBi gain, lose about 2dB because the board
    is in backwards, loose another 1dB for coax and connector losses, it
    becomes an 8dBi antenna. Still, not bad for $30US.


    --
    # Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
    # 831-336-2558
    # http://802.11junk.com jeffl@cruzio.com
    # http://www.LearnByDestroying.com AE6KS

  6. #6
    AnthonyL
    Guest

    Re: Wireless Router High Gain Antenna

    On Wed, 24 Feb 2010 22:30:44 -0800 (PST), AB9IL
    <ab9il.worldwide@gmail.com> wrote:

    >Recently I had a need to get substantial improvement in my wireless
    >router's performance, and thought a yagi antenna would help. Whoa! It
    >did indeed help, so I have posted some pictures and a short how-to on
    >the web at:
    >
    >http://www.ab9il.net/wlan-projects/wifi7.html
    >
    >It is the same 15 element yagi used for extending the range of USB
    >wireless adapters, but connected via pigtail to a router. I can now
    >connect indoors through concrete and plaster walls or provide wi-fi
    >connectivity to laptop and Ipod touch users up to 300 meters away, in
    >the presence of interference.
    >
    >Maybe it can help some of you trying to cover some large areas with
    >your routers.
    >



    Isn't it necessary to boost the signal of the receiving equipment as
    well, or is it sufficient that the sensitivity on the router antenna
    has been improved enough to still receive the weaker connected device?

    Thanks


    --
    AnthonyL

  7. #7
    seaweedsl
    Guest

    Re: Wireless Router High Gain Antenna


    >
    > Isn't it necessary to boost the signal of the receiving equipment as
    > well, or is it sufficient that the sensitivity on the router antenna
    > has been improved enough to still receive the weaker connected device?
    >



    Antennas work for both transmit & receive, so higher gain is in both
    directions for any radios+antennas within it's field of coverage.
    Weaker or not.

    It's when you up the transmit amp alone that you get lopsided
    effects. Thus the general rule is to address weak connections with
    antenna gain not radio amps.


    Steve

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