[MLB-WIRELESS] rectangular waveguide theory?

[Roger Venning]

See http://www.ee.sc.edu/classes/Spring02/elct561/Lecture%209.doc

TE10 mode will couple effectively into free space. If your can is 6.5" 
wide, 4" high and 9.5" long then it will be vertically polarised when 
you put a 1/4 free space wave stub within located 1/4 of a guide 
wavelength from the shorted (closed) end, equal distance from either 
side (this is the location of an anti-node, where the field goes from 
maxima to minima).

This is the same to what is used for coupling from Coax to waveguide and 
then into horns. It would be moderately directional.

Roger.

Drew wrote:
> I have access to a lot of rectangle cans, wondering if they'd be 
> suitable for antenna, but haven't come across any info on building 
> rectangular cantenna's. I have seen this page: 
> http://members.iinet.net.au/~clark/FreeNet/#BrickAntennaDesign but 
> there's no theory or calc's listed like on the page for circular 
> cantenna's. http://www.turnpoint.net/wireless/cantennahowto.html
> 
> Anyways, the cans I have are 6.5"x4"x9.5" with rounded edges, 
> approximately .5" radius curve. Can anyone help with the RF theory?
> 
> Drew
> 
> 
> 
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