The subject of loop antennas for transmitting pops up occasionally.
This may have been viewed here before but THIS LINK is for just such an application.
The antenna is 30" square and the transmitter is the Wenzel design along with some other nice projects.
That is certainly an attractive self-contained transmitter unit.
From discussions about loop antennas we recall that they are directional, in a figure-8 pattern.
But we've always talked about flat loops that only have 2-dimensions: width and height.
What about a more complex loop that fills out in 3-dimensions? We should be able to have an omni-directional complex loop.
RE Quote below from another website:
"Those who have experimented with electric field transmitters like those above have probably discovered that they only work well when the antenna is free and clear and there is little solid matter between the transmitter and receiver. The electric field is easily "shorted out" by even slightly conductive materials. In contrast, this loop transmitter generates a magnetic field that can cut right through the thickest walls."
Just to note that electromagnetic radiation (a radio wave) ALWAYS includes both a magnetic and an electric field. Neither one can exist without the other. In the far field, they always have the same relationship to each other -- no matter what geometric form of antenna (vertical monopole, loop etc) produced that radiation, and no matter what the propagation path -- including through walls.
Most consumer-grade, indoor AM broadcast band receivers use a horizontally-oriented loopstick antenna, which responds only to the magnetic field of the radio wave. Those receivers have no problem receiving the radiation from the vertical monopole "electric" radiators of AM radio stations (licensed or unlicensed), because the magnetic field is oriented +/-90 physical degrees from the electric field, AND those receivers are using only the magnetic field for reception.
If the electric field was "easily 'shorted out' by even slightly conductive materials," then the magnetic field would be reduced by the same ratio.
I see no problems with the technical accuracy of your post Rich, but what in the heck does it have to do with the orginal post about loop transmitting antennas?
...what in the heck does it have to do with the orginal post...
It has to do with the text that was linked in the original post, which could mislead some as to the usefulness of the field components of a radio wave.
I included that text in my post commenting on it.
...As Carl brought up....Ummm, probably won't work, just as Rich indicated. If you tried to construct a multi-element loop antenna, you're really constructing two (or more) magnetic antennas. In close proximity, one would just end up receiving and either absorbing or reflecting (who knows where) a great deal of the signal field being transmitted by the other, and the result is going to be a significant loss. Does that make sense?