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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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