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Scott, I kind of think that is the way sleeve type devices work, but Bob is better at this understanding. Maybe it has to do with the idea that RF flows on the surface and then imagine how currents work inside of coax, so as not to cause radiation when the coax remains in tact.

I also think in some ways the Starduster design has some similar affects on protecting the feed line from radiating and ill-affecting the radiated pattern. We haven't discussed symmetry yet, but I think I could argue that it has something good to do with all this chatter we're making.

I think it goes without saying that how an antenna deals with the feed line has a lot to do with how effective it ends up being. In my little efforts at modeling I see very little currents flowing below the Vector/Sigma4 design. Relative to the 5/8 wave the magnitude is Nil.

<blockquote data-quote="Marconi" data-source="post: 246295" data-attributes="member: 903">Scott, I kind of think that is the way sleeve type devices work, but Bob is better at this understanding. Maybe it has to do with the idea that RF flows on the surface and then imagine how currents work inside of coax, so as not to cause radiation when the coax remains in tact. &nbsp;I also think in some ways the Starduster design has some similar affects on protecting the feed line from radiating and ill-affecting the radiated pattern. We haven&#039;t discussed symmetry yet, but I think I could argue that it has something good to do with all this chatter we&#039;re making.&nbsp;I think it goes without saying that how an antenna deals with the feed line has a lot to do with how effective it ends up being. In my little efforts at modeling I see very little currents flowing below the Vector/Sigma4 design. Relative to the 5/8 wave the magnitude is Nil.</blockquote>

[QUOTE="Marconi, post: 246295, member: 903"] Scott, I kind of think that is the way sleeve type devices work, but Bob is better at this understanding. Maybe it has to do with the idea that RF flows on the surface and then imagine how currents work inside of coax, so as not to cause radiation when the coax remains in tact. I also think in some ways the Starduster design has some similar affects on protecting the feed line from radiating and ill-affecting the radiated pattern. We haven't discussed symmetry yet, but I think I could argue that it has something good to do with all this chatter we're making. I think it goes without saying that how an antenna deals with the feed line has a lot to do with how effective it ends up being. In my little efforts at modeling I see very little currents flowing below the Vector/Sigma4 design. Relative to the 5/8 wave the magnitude is Nil. [/QUOTE]

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