Re: omnidirectional antenna using 4 biquads

On Sun, 3 Feb 2008 11:49:59 -0800 (PST), miso@xxxxxxxxx wrote in
<07716fc1-144a-4ae9-b393-638a83bb221c@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:

On Feb 3, 7:57 am, "Adair Winter" <ada...@xxxxxxxxxx> wrote:
<m...@xxxxxxxxx> wrote in message

news:bb019663-7b79-41c6-a2a5-65f69c959e44@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Dumb question perhaps, but here goes. If you arrange 4 biquads in a
rectangular formation and used a power combiner, would you get a
decent omnidirectional antenna? Looking at the biquad pattern
http://martybugs.net/wireless/biquad/images/biquad_azimuth.jpg
the antenna is good for about +-45 degrees. Seems to me you would get
an omnidirectional antenna without too squished of a donut. The
disadvantage is the combiner loss of 6db (ideal).

The other problem I see is if you use some sort of combiner or phasing
harness the loss associated with such a device would be more or equal to the
gain of any one antenna.

No, the loss is very close to 6dB. Gain should be around 14db prior to
loss. What might make a difference is the aperture.

Gain will probably only be 10-12 dB at best, with holes of much worse
gain. A standard hi-gain omni is a much better way to go.

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