Double bi-quad antenna reflector size?

Not being an RF engineer, I need to know the dimensions of the reflector for
a double bi-quad antenna for a wireless lan link (two wire bowties placed in
front a flat plate reflector - here is a quad bi-quad:
http://www.frars.org.uk/cgi-bin/rend...2&goback=1064).

This is how I see it (I may be wrong), any wires that have no sheild 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 radiator spacing
I am not sure about.

Cheers

Rob

Don't know if this link will help.

http://www.seattlewireless.net/index.cgi/AntennaHowTo


Bob

"Rob" <(E-Mail Removed)> wrote in message
news:rYgVa.307$(E-Mail Removed)...
> Not being an RF engineer, I need to know the dimensions of the reflector
for
> a double bi-quad antenna for a wireless lan link (two wire bowties placed
in
> front a flat plate reflector - here is a quad bi-quad:
>
http://www.frars.org.uk/cgi-bin/rend...2&goback=1064).
>
> This is how I see it (I may be wrong), any wires that have no sheild 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 radiator
spacing
> I am not sure about.
>
> Cheers
>
> Rob
>
>
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>
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Hi Bob,

It is useful, I have seen nearly all the pages on the links.
The French double bi-quad looks interesting, shame its so big, too big for
box for sure.
Thank you for the link.
I think I will have to build a single and a double and compare long range
results.

Cheers


"Bob" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Don't know if this link will help.
>
> http://www.seattlewireless.net/index.cgi/AntennaHowTo
>
>
> Bob
>
> "Rob" <(E-Mail Removed)> wrote in message
> news:rYgVa.307$(E-Mail Removed)...
> > Not being an RF engineer, I need to know the dimensions of the reflector
> for
> > a double bi-quad antenna for a wireless lan link (two wire bowties
placed
> in
> > front a flat plate reflector - here is a quad bi-quad:
> >
>
http://www.frars.org.uk/cgi-bin/rend...2&goback=1064).
> >
> > This is how I see it (I may be wrong), any wires that have no sheild
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 radiator
> spacing
> > I am not sure about.
> >
> > Cheers
> >
> > Rob
> >
> >
> >
> >
> >
> >
> >
> >
> >
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> >
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>