scibenj wrote:The question of causality in electromagnetics has recently received renewed attention in part due to the late professor Jefimenko who examined the causality of Maxwell's equations and noted that the widely held belief that E and H fields cause each other is false. And that means that Faraday's law is bogus.
_Jim wrote:I would like to enter into the record an (almost) exclusively E-field antenna (in the near or reactive field area) of size 2 to 5% wavelength as contrasted with a small (< 1/5WL) loop (magnetic field dominant in the near or reactive field) or even the traditional 1/2 wave 'dipole' antenna.
http://trputec.com/s52st/bipol/9a4zz_bipol_antena.pdf
Note the on the second sheet (page 19) in FIgure 4 the depiction of the radiation (or reception) pattern of this antenna; I can confirm in my own experiments the same 'response' pattern.
Note well, the antenna response or 'pattern' is directly _opposite_ that of a traditional 1/2 wave dipole antenna. That is, maximum response (or radiated energy) occurs _end-on_ rather than _broadside_ as one has with the usual, traditional 1/2 wavelength dipole.
I am asserting that the antenna described in the above pdf document works on the principle of differential electric field 'induction' as an impinging EM wave encounters this "Bipole" E-field antenna (as described in the above pdf document). This will be as opposed to the singular (non-differential) 'magnetic' induction of current in a standard 1/2 wavelength dipole antenna.
_Jim
Q-reeus wrote:_Jim wrote:I would like to enter into the record an (almost) exclusively E-field antenna (in the near or reactive field area) of size 2 to 5% wavelength as contrasted with a small (< 1/5WL) loop (magnetic field dominant in the near or reactive field) or even the traditional 1/2 wave 'dipole' antenna.
http://trputec.com/s52st/bipol/9a4zz_bipol_antena.pdf
Note the on the second sheet (page 19) in FIgure 4 the depiction of the radiation (or reception) pattern of this antenna; I can confirm in my own experiments the same 'response' pattern.
Note well, the antenna response or 'pattern' is directly _opposite_ that of a traditional 1/2 wave dipole antenna. That is, maximum response (or radiated energy) occurs _end-on_ rather than _broadside_ as one has with the usual, traditional 1/2 wavelength dipole.
I am asserting that the antenna described in the above pdf document works on the principle of differential electric field 'induction' as an impinging EM wave encounters this "Bipole" E-field antenna (as described in the above pdf document). This will be as opposed to the singular (non-differential) 'magnetic' induction of current in a standard 1/2 wavelength dipole antenna.
_Jim
Jim - in respect of your 'bipolar' antenna article. Can't read Croatian or whatever Eastern European lingo that article is written in. As you know, it's a requirement to present material here in English. So can you translate it accordingly? In the mean time I'll just make some preliminary remarks on a 'best guess' basis.
The pics and illustration Fig. 3 initially suggest an inductively loaded short electric dipole, but your field pattern of Fig. 4 is as you say very different to that of an electric dipole radiator. Seems to me what you actually have there is an inductively loaded linear electric quadrupole radiator - and the measured pattern is not the far-field radiation pattern but that of the near field. Otherwise you seem to be claiming 'new physics' - a radical departure from Maxwell's equations at work. Is that the case?
Further, how do you figure standard electric dipole works by way of 'magnetic' induction? So-called magnetic induction is connected with loop antennas - not linear electric dipoles!
Q-reeus wrote:_Jim wrote:I would like to enter into the record an (almost) exclusively E-field antenna (in the near or reactive field area) of size 2 to 5% wavelength as contrasted with a small (< 1/5WL) loop (magnetic field dominant in the near or reactive field) or even the traditional 1/2 wave 'dipole' antenna.
http://trputec.com/s52st/bipol/9a4zz_bipol_antena.pdf
Note the on the second sheet (page 19) in FIgure 4 the depiction of the radiation (or reception) pattern of this antenna; I can confirm in my own experiments the same 'response' pattern.
...
_Jim
Jim - in respect of your 'bipolar' antenna article. Can't read Croatian or whatever Eastern European lingo that article is written in. As you know, it's a requirement to present material here in English. So can you translate it accordingly? In the mean time I'll just make some preliminary remarks on a 'best guess' basis.
...
Q-reeus wrote:Jim - in respect of your 'bipolar' antenna article. Can't read Croatian or whatever Eastern European lingo that article is written in. As you know, it's a requirement to present material here in English. So can you translate it accordingly? In the mean time I'll just make some preliminary remarks on a 'best guess' basis.
Q-reeus wrote:The pics and illustration Fig. 3 initially suggest an inductively loaded short electric dipole, but your field pattern of Fig. 4 is as you say very different to that of an electric dipole radiator. Seems to me what you actually have there is an inductively loaded linear electric quadrupole radiator - and the measured pattern is not the far-field radiation pattern but that of the near field. Otherwise you seem to be claiming 'new physics' - a radical departure from Maxwell's equations at work. Is that the case?
Q-reeus wrote:Further, how do you figure standard electric dipole works by way of 'magnetic' induction? So-called magnetic induction is connected with loop antennas - not linear electric dipoles!
_Jim wrote:...Unfortunately, you, too, seem to have fallen for what is pasted into textbooks as 'the truth'. Suggest take a look at the Kinstar 'vertical' antenna and then come back to me and tell me the same line as above.
I was once like you, thinking only in terms of 1/4 wave antennas, and the two fields were important for radiation; Iam far less convinced these days.
Respectfully but sternly,
_Jim
PS Added during edit:
Test report for Kinstar, note the efficiency compared to 1/4 WL vertical reference antenna, page 7
http://www.kintronic.com/resources/tech ... ers/15.pdf
Seeing the results of this test reset my 'thinking' how antennas work WRT size, meaning, 'size' per se
is not that important a factor. And as of late, I am also thinking the H field is coming into play and
more important for radiation than E field.
Unfortunately, that is not a paper I authored. I did, however, build and repeat his experiment, and using cut and paste from the author's paper did translate (using Google translate) the Croatian text to English to determine if I was interpreting his diagrams correctly.
Current 'loop' maxima in center of dipole. This is well known. EM field will induce a current in same direction on both dipole legs, with feedpoint in the center, on pk of one RF cycle the polarity of one leg is + while other is -.
I and E loops and nodes: http://electriciantraining.tpub.com/141 ... 82_173.htm
Each 'leg' may be shortened without appreciable loss in radiation performance (efficiency) IF ending load is used, that is, if the antenna is kept resonant.
Resonance assures maximum current at 'loop' point in the center.
_Jim wrote:Bzzzzzt! I don't even pretend to know what you mean by 'scalar' waves and a reference to Tesla.
Please stick to the subject and the objective results presented. The discussion might just end right here.
_Jim
You are also addressing issues in your posts I did not raise such as Q and BW; these are important in the use and implementation, but since we are unable to even 'walk' yet in regards to understanding the phenom presented, I think you are trying to 'run' too early ...
I have also not addressed testing in real world conditions using the WSPR network and performing comparative testing against a wire dipole; transmissions were performed simultaneously to avoid fades and other HF (SW to the public) band anomalies ... the purpose at the outset of all this was to prove or disprove some of the 'wilder' antenna designs and/or theories roaming freely out there on the internet ...
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