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A waveguide is a horizontally polarised omni antenna, typically being
either 180 degrees, or 360 degrees.
They are available commercially, but are rather expensive.
Trevor Marshall [1] has a web page [2] describing the design of the
waveguide, and the theory behind their operation.
A number of people have had waveguides manufactured [3] out of
aluminium, but the materials are still rather expensive.
Rob Clark [4] came up with the bright idea of using commonly
available downpipe to make waveguides.
Marcus [5] took the idea one step further, constructing a couple of
8-slot 180-degree waveguides, and testing them thouroughly [6] to
determine the performance.
The test results [7] show the downpipe waveguide has a gain of
approximately 16-18dBi, with the azimuth plots matching Trevor's
theoreticaly plots almost exactly.
Links:
------
[1] http://trevormarshall.com/
[2] http://trevormarshall.com/waveguides.htm
[3] http://narx.net/~mike/projects/waveguide/
[4] http://members.iinet.net.au/~clark/FreeNet/Waveguide/
[5] http://planetaxis-web.sytes.net/wireless/downpipe.cgi
[6] http://martybugs.net/wireless/antennacomp.cgi
[7] http://martybugs.net/wireless/antennacomp.cgi
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