ARLA/CLUSTER: A futura invisibilidade das antenas dos radioamadores

[Pedro Ribeiro]

Segundo interpreto este "desaparecer" refere-se ao aspecto "rádio".

Apesar de já terem sido demonstradas formas de "cloak" ao espectro 
visivel, neste caso a aplicação é essencialmente em coisas como a 
invisibilidade a radar,  de as torres de suporte não afectarem o 
diagrama de radiação e desempenho das antenas em volta, etc.

73!

On 29-08-2012 23:26, CT1BAT wrote:
> Isto é que é serviço!!!
> "Na Convenção Boxboro em Massachusetts, em 25 de agosto, W1YW deu a primeira demonstração pública de um manto de invisibilidade real.
> Bem mais de 150 radioamadores ansiosos e convidados assistiram a uma demonstração ao vivo do mastro de metal a desaparecer..."
> Estão prestes a acabar os problemas de alguns colegas com os "condemónios", eh eh
> 73 de
> José Machado -- CT1BAT
>
>
> -----Mensagem original-----
> De: cluster-bounces  radio-amador.net [mailto:cluster-bounces  radio-amador.net] Em nome de João Costa > CT1FBF
> Enviada: quarta-feira, 29 de Agosto de 2012 11:42
> Para: Cluster-ARLA
> Assunto: ARLA/CLUSTER: A futura invisibilidade das antenas dos radioamadores
>
> Hamfest Talk shows Invisible Surprises
>
> With a forgotten technology first used by Marconi , Chip Cohen W1YW, brought Marconi's "metamaterials" to a whole new level--he made them do a disappearing act.
>
> At the Boxboro Convention in Massachusetts on Aug 25, W1YW gave the first public demonstration of an actual invisibility cloak. Well over a 150 eager radio hams and guests saw a live demonstration of metal mast disappear at microwaves, over a wide bandwidth, by partially covering it with a Marconi-inspired invisibility cloak.
>
> W1YW's invisibility cloak is the first actual device that makes things disappear. Using fractals as resonators, it slip-streams the waves around an obstacle, and in that process hides the obstacle completely.
> It joins these resonators/antennas with a very close (but not
> touching) spacing--an idea that came to Marconi and his collaborator Franklin in 1919. "Marconi never came close to making an invisibility cloak, but everyone using metamaterials--those closely spaced
> resonators-- owes that basic idea to him."
>
> W1YW's invisibility cloak development was a slow one over a dozen years. "It harps back to work I would do tinkering with antennas when the bands were dead." The first invisibility cloak demonstration finally came to fruition in 2009.
>
> While science fiction and Harry Potter have fascinated people with the notion of the invisibility cloak, W1YW's invention is the only one that works. W1YW has just received the very first, and basic, patent for invisibility cloaks--U.S. patent 8,253,639.
>
> W1YW also showed a very large invisibility cloak with nearly 10,000 little resonator/antennas making it the largest--in number-- antenna array in the world. " I was delighted to show something very special in terms of the size and type of objects cloaked. The general public will be aware of this soon, but I wanted my fellow radio amateurs to have the fun of seeing it first" . Added W1YW: "This changes everything."
>
>
>
>
>
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