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On 18 Feb, 08:20, "Wimpie" wrote:
On 17 feb, 18:04, "art" wrote: On 17 Feb, 07:58, "Wimpie" wrote: On 17 feb, 04:55, "art" wrote: Is the Fariday rotation effect incorporated in any way with the basic NEC 2 and 4 computor design programs? Art Hello Art, If you main the rotation of polarization of a wave during transit in a DC magnetized medium, it is NO for NEC2. I do not believe that it is modeled in NEC4. Best Regards, Wim Yes that is what I mean noting that since it cannot be cancelled it thus applies to a.c. as well. I somehow believe that it is connected in some way to curl but ofcourse I have no reference to it. I have the distinct feeling that it refers to the offset in polarity created by the horizontal vector of curl which thus means for the case of equilibrium polarity cannot be at right angles to the radiating elements surface or parallel to it . I can duplicate this situation using NEC based computor programs i.e. tilt, but I cannot find reference to it anywhere. One must remember that Faradays work is now quite old with respect to modern day advances but then we are now getting a bit deep for most readers. My computor program predates NEC 4 ! Regards Art Hello Art, As far as I know, all (maybe most) simulators for antennas assume the media to be HILS, you can only enter properties like u', u'' or e' e'', or in the form of absolute u or e together with a loss factor. Probably there will be specialized simulators or custom programs within research facilities that can handle non-HILS meda, but I think that is of no use for antenna design for radiocommunication where the interface is air. Of course for propagation faraday rotation can be of importance. If a metallic structure gives rise to polarization change, this will be shown by antenna simulators that can visualize field properties like E and H. Best Regards, Wim PA3DJS- Hide quoted text - - Show quoted text - Wimpie I do like your style of debate even where some statements appear lacking in thought. Back to the subject. I would agree that such rotation if viable would appear in E H diagrams since Faradays rotation is about equilibrium in relative cosmic terms. This now leads to the main question of radiation where the current distribution on a radiating member is shown in a two dimensional form which by intuition states that the direction of radiation is at right angles to the radiator but this would only be true when it is not time related. Even if it was time related the vectors involved cannot produce a vector for the culmination of both vectors that would point in a direction at right angles to the radiating surface ( this is moving from cosmic relativity to local relativity if you follow my point ) Thus intuitively maximum radiation cannot possibly be at right angles to the radiator and also not, at right angles to the earth unless compensating tilt is given to the radiator. To prove this one can place a vertical radiator at right angles to the earths surface and record the differences in radiation IN ALL POLARITIES at every degree of tilt until equilibrium occurs ( this I have confirmed by the use of a computor program that designs a vertical dipole where all dimensions are variable at the beginning and where the computor arrives at the point of equilibrium ) So in summation Faradays rotation is a subject of equilibrium and in his case refers to cosmic and where "curl " is a derivative thereof with respect to earth, which as you state will be shown in the E and H vector format. Hopefully you can follow all that and prove it for yourself with a vertical radiator design. Best Regards Art |
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