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:
    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.

    Rob, Jul 25, 2003
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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
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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


    Rob, Jul 26, 2003
  4. Where can I find details about how this sort of antanna works?
    Keith Roberts, Jul 26, 2003
  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
  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 Hall, Jul 26, 2003
  7. Rob

    dold Guest

    dold, Jul 26, 2003
  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 ?


    Rob, Jul 26, 2003
  9. Rob

    Jeremy Parr Guest


    Jeremy Parr, Jul 27, 2003
  10. Rob

    Rob Guest

    Rob, Jul 27, 2003
  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.


    Rob, Jul 27, 2003
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