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<blockquote data-quote="s-band" data-source="post: 1013598" data-attributes="member: 407744"><p>That's the way I see it. When the plate is in line with the linear wave, it delays it by 90 degrees so the loss should not be much different to the linear to circular conversion loss (i.e. the dielectric loss of a dB or so) In the case of the AVComm, lambda guide is different for the major and minor axes. If the incoming wave is at 45 degrees to the axes, it splits it into +/-45 delays to give circular. If the wave is in line with either axis totally, it is only the delay that changes when switching between V & H. The barrel type polariser should have minimal loss for circular & linear as there is no dielectric loss.</p><p><a href="http://lea.hamradio.si/~s57uuu/emeconf/eme06.htm" target="_blank">A simple circular polarizer for 10GHz</a> has drawings of the plate case.</p><p>I think I got that more or less correct but it's been a long day, so e&oe.</p></blockquote><p></p>
[QUOTE="s-band, post: 1013598, member: 407744"] That's the way I see it. When the plate is in line with the linear wave, it delays it by 90 degrees so the loss should not be much different to the linear to circular conversion loss (i.e. the dielectric loss of a dB or so) In the case of the AVComm, lambda guide is different for the major and minor axes. If the incoming wave is at 45 degrees to the axes, it splits it into +/-45 delays to give circular. If the wave is in line with either axis totally, it is only the delay that changes when switching between V & H. The barrel type polariser should have minimal loss for circular & linear as there is no dielectric loss. [URL='http://lea.hamradio.si/~s57uuu/emeconf/eme06.htm']A simple circular polarizer for 10GHz[/URL] has drawings of the plate case. I think I got that more or less correct but it's been a long day, so e&oe. [/QUOTE]
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