You have to have the current circulating back and forth to get efficient radiation.
Yes, there are non-resonate antennas.?? First on my list would be a Beverage Antenna.
fantastic for rec. but not very good on Tx.?? Next would be the E-Field antenna.
Again non-resonate, but you can't transmit with one.? H-Field antennas again make
a great rec but a poor Tx antenna on HF.?? Got to keep that Q up.? Now we get into the question
of "Do we count the effects of the feedline and other circuits?"?? In that paper he doesn't,but in the real world we simply have an antenna system containing components that?
are not exactly part of the antenna.
Of course we can take Q too far.? 160 Meter mobile antennas come to mind, now thepoor radiation is from resistive losses and the challenge of mating a 50 Ohm line toan extremely low impedance load.
At the moment I own 4 Vector Network analyzers, 4 Scalar Network Analyzers, and 3 Nano's.
One nano for work, one for the lab, and one in case I 'brick' one.?
Cute little guys.? My HP 8610 may go up to 40 GHz, but it doesn't fit in my pocket!???
Just got my TinySA.??? Again an amazing amount of power in a small container.Kent WA5VJB?? Antenna Editor? CQ Magazine???? (Will have a Nano in my next column)
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On Sunday, August 16, 2020, 3:08:05 PM CDT, Roger Need via groups.io <sailtamarack@...> wrote:
On Sun, Aug 16, 2020 at 11:39 AM, KENT BRITAIN wrote:
? To be an efficient radiator, you have to
resonate.???? Kent WA5VJB
This is not true.? Many types of antenna systems are "efficient radiators" off their resonant frequency.? Rather than go into a long discussion here I will refer to this post by Owen Duffy because he has detailed examples.
From his article?
"It is often that one hears in QSO, one OM to another, describing their antenna and stressing the importance of >>resonance, almost as qualification that if the antenna is resonant, then it performs well, and that by implication a
non-? resonant antenna has poor performance.
Whilst the importance of resonance is often parroted on the bands, reputable texts do not seem to echo the sentiment."
Roger
