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Could a multi-frequency amateur radio(or other type)antenna be created, with an easily variable mechanical length, by filling a tube with conductive salt water, possibly ferromagnetic fluid, or metal particles and oil, for example, and changing the mechanical length of the antenna as needed by pumping
liquid in and out of the tube? The antenna would be sensitive to movement and would have to be stationary
Liquid Metal Antennas
http://www.eham.net/articles/13251
Uncovered when researching the equally baked "flowing metal heatsink". [phoenix, May 27 2008]
Liquid Metal Antenna
http://www.hamdomain.com/lm-antenna/
The designer's page. [phoenix, May 27 2008]
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Annotation:
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Possible, but nearly as effective to use a log-periodic antenna .... |
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