Double double bi-quad antenna plans?

Discussion in 'Wireless Internet' started by Rob, Jul 25, 2003.

  1. Rob

    Rob Guest

    Has anyone seen any plans for a double double bi-quad (2 bowties)?

    I have seen a quad double bi-quad, which is 4 bowties = 16db:
    http://www.frars.org.uk/cgi-bin/render.pl?action=link&url=1162&goback=1064
    but that will be too big to fit in the weather proof box.
    I have 24.5x15.0cm or 20.5x19.0cm in room to play with depending on which
    way the board is placed in the case.

    Cheers
    Rob
     
    Rob, Jul 25, 2003
    #1
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  2. Just a thought - but could you put 2 patch panel antenna together to get a
    better signal?
     
    Keith Roberts, Jul 25, 2003
    #2
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  3. Rob

    Rob Guest

    Just a thought - but could you put 2 patch panel antenna together to get a
    This was my other option.
    Have you seen the plans for a single patch panel antenna?
    I found some photos and text(pdf file) which was in Spanish and not very
    good.

    Cheers

    Rob
     
    Rob, Jul 26, 2003
    #3
  4. Where can I find details about how this sort of antanna works?
     
    Keith Roberts, Jul 26, 2003
    #4
  5. If you find a way to use two patch pahels together I would be very
    interested - how would you get the signal split/combined between the two
    antenna. Would you have to use careful spacing on them - multiples of
    wavelength or something
     
    Keith Roberts, Jul 26, 2003
    #5
  6. Rob

    Bob Hall Guest

    The small sqare is the radiator and the larger disk is the reflector. Seems
    pretty simple, but of course the devil is in the details.

    I have no idea where to find the details.

    Bob
     
    Bob Hall, Jul 26, 2003
    #6
  7. Rob

    dold Guest

    dold, Jul 26, 2003
    #7
  8. Rob

    Rob Guest

    Its not a patch antenna I am thinking of, it may be a sector antenna.
    Its a flat pcb with rectangles cut out of about 4 places around the edge.
    Think of it as 4 thinner rectangular boards (122mm x 40mm) all side by side
    but each alternate board is higher than the adjacent board by about 1.5 cm.
    Anyone seen this ?

    Cheers

    Rob
     
    Rob, Jul 26, 2003
    #8
  9. Rob

    Jeremy Parr Guest

    Waveguide?

     
    Jeremy Parr, Jul 27, 2003
    #9
  10. Rob

    Rob Guest

    Rob, Jul 27, 2003
    #10
  11. Rob

    Rob Guest

    I think you a correct but I am no RF engineer.
    This is how I see it (I may be wrong), any wires that have no shield will
    act as a radiator, so if the length is a wavelength or wavelength divided by
    2,4,8 etc (ie speed of light in air/frequency, 300,000,000ms/2,440,000,000hz
    = 0.123meters), then the wave is not disturbed and continues along its path.
    The biquad is a piece of wire 244mm(2 wavelengths) long folded into 2
    squares, so I guess you have 8 radiators.
    So to connect 2 biquads or patch panels together the wire below would have
    to be 123mm long and connect to the coax in the centre.
    Therefore a double biquad would be 123 x 244mm, but I need someone to
    confirm this.
    The radiator part I think is OK, its the reflector size and raditor spacing
    I am not sure about.

    Cheers

    Rob
     
    Rob, Jul 27, 2003
    #11
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