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Old May 9th 09, 08:28 PM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Mar 2007
Posts: 3,521
Default Dual-Z0 Stubs

Richard Harrison wrote:
"A wire antenna is a circuit with distributed constants; hence the
current distribution in a wire antenna that results from the application
of a localized voltage follows the principles discussed in Chap. 4
(Transmission Lines), and depends upon the antenna length, measured in
wavelengths; the terminations at the ends of the antenna wire; and the
losses in the system."


In other words, an antenna acts a lot like a lossy
transmission line where the loss from the system
is radiation.

Here's a transmission line example using resistance
wire in a transmission line to emulate the losses
normally due to radiation in an antenna. Note that
the feedpoint impedance is around 35 ohms.

http://www.w5dxp.com/stub_dip.EZ
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com


 
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