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The meaning of 'Radiation Resistance'
On 07/15/2010 04:14 AM, Owen Duffy wrote:
I note some variation in the use of the term 'Radiation Resistance' (Rr) that suggests that it has different meanings to different folk. snip Hello, and I don't find any ambiguities in any of my various EM and antenna theory textbooks. FWIW, from the IEEE Standard Dictionary of Electrical and Electronics Terms: "Radiation resistance (antenna). The radio of the power radiated by an antenna to the square of the rms antenna current referred to a specified point. Note: This term is of limited utility in lossy media." So if we're looking at free (in vacuo) space the radiation resistance is simply a "load" resistance component that accounts for where the radiated power goes. The radiation resistance doesn't include any other resistive losses in the antenna structure/proximity operating environment that may also be dissipating source power introduced at the feedpoint of the antenna. An aerodynamic analogy would be the distinction between "induced" drag (the price paid for "lift") and "parasite" drag, which are both components of the total drag. Sincerely, and 73s from N4GGO, -- John Wood (Code 5520) e-mail: Naval Research Laboratory 4555 Overlook Avenue, SW Washington, DC 20375-5337 |
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