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small antennas
Sal M. Onella wrote:
"NM5K" wrote in message ... Art Unwin wrote: if it was possible they would already have done it. And he is right. They have only had about 100 years to work on it. Yes. In the 1950's the USAF studied small antennas for the "new" Boeing 707's that they were buying as C-135/KC-135. I remember reading about it in one of the magazines of the time. They apparently were not entirely happy with the antenna that projected forward from the top of the stabilizer. They continued to employ a belly-mount trailing wire on some aircraft at least into the 1980's. (Good info hard to find.) If all the money the Air Force could throw at a problem didn't come up with some magic, do we have a lot of hope??? Hope for what? Magic? The tradeoffs inherent in electrically small antennas are well known, and each design requires intelligent application of that knowledge to come up with an antenna that's acceptable in size, form factor, and performance for that particular use. Many, many antennas now being designed and ones in common use are electrically small -- the ones in your car's remote control key fob, your Bluetooth USB dongle or cell phone earpiece, and embedded in RFID tags are just a very few examples. With the increasing use of wireless devices, the need for electrically small antennas has grown rapidly, and there are a number of good texts devoted to that specific topic. These texts contain a good treatment of the tradeoffs involved and useful ideas for designs using currently available technology and materials, but no new fundamental theory. Advancements in the art will continue to come with intelligent and clever application of established theory by people who understand the theory and how to apply it, not from tinkerers who lack this knowledge and conjure their miracles by vague hand-waving and bad measurement. Roy Lewallen, W7EL |
#2
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small antennas
Roy Lewallen wrote:
... Hope for what? Magic? The tradeoffs inherent in electrically small antennas are well known, and each design requires intelligent application of that knowledge to come up with an antenna that's acceptable in size, form factor, and performance for that particular use. Many, many antennas now being designed and ones in common use are electrically small -- the ones in your car's remote control key fob, your Bluetooth USB dongle or cell phone earpiece, and embedded in RFID tags are just a very few examples. With the increasing use of wireless devices, the need for electrically small antennas has grown rapidly, and there are a number of good texts devoted to that specific topic. These texts contain a good treatment of the tradeoffs involved and useful ideas for designs using currently available technology and materials, but no new fundamental theory. Advancements in the art will continue to come with intelligent and clever application of established theory by people who understand the theory and how to apply it, not from tinkerers who lack this knowledge and conjure their miracles by vague hand-waving and bad measurement. Roy Lewallen, W7EL Ahh, the "magic man" himself is here ... the guy who write a simplistic interface to feed a text file to the real NEC engine ... My gawd man, carry on, we await you wisdom ... smiling-out-the-one-side-of-ones'-face With all DUE respect, JS |
#3
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small antennas
"Roy Lewallen" wrote in message treetonline... Sal M. Onella wrote:. snip If all the money the Air Force could throw at a problem didn't come up with some magic, do we have a lot of hope??? Hope for what? Magic? snip By "magic" I meant the development of technology that was heretofore unidentified, not some false illusion by a conjurer. I agree with the essential need for "clever application of established theory ... [etc]" as you so eloquently stated. In that sense, the IC was magic. (Sorry if I seem to liken technology too much to magic.) |
#4
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small antennas
On Oct 5, 10:28*pm, "Sal M. Onella"
wrote: "Roy Lewallen" wrote in message treetonline... Sal M. Onella wrote:. snip If all the money the Air Force could throw at a problem didn't come up with some magic, do we have a lot of hope??? Hope for what? Magic? snip By "magic" I meant the development of technology that was heretofore unidentified, not some false illusion by a conjurer. * *I agree with the essential need for "clever application of established theory ... [etc]" * as you so eloquently stated. In that sense, the IC was magic. *(Sorry if I seem to liken technology too much to magic.) If the USAF crew all read the same books before their journey then they all had the same experience many times over. What it takes is imagination and the will to deviate from the well trodden paths where different experiences and views empower men to challenge the old based on experiences that others have not travelled. It then takes a generation for those that failed and snarled at the new to leave the scene so that later research turns up the more recent past and thus reinvents the wheel. Einstien left classical physics because he could not find the key for the Universal laws and probed into the science of relativity purely to gain a different perspective or view of the former problem which required a move away from the well trodden path to get the answer. Unfortunately he died before finding the answer but was on the right track in not assuming that all was known because of the high number of failures before him who all trod the same path and arrived at the same destination. |
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