I have already experimented with the following:
1. Using air pressure to force the liquid metal up plastic tubing,giving you adjustable length elements. An entire yagi beam antennacould be adjusted in frequency by putting liquid metal tubes on the elementends. My prototype liquid metal antenna can adjust to the 2m, 220,and 440 bands plus has a contact near the top for a fixed 6m connection.
2. You can make a stretchable elastic wire. Liquid metalis placed in a rubber tube with contacts on the ends. The advantageof making a stretchable elastic wire with liquid metal is that the surfaceis continuous - it has a predictable impedance.
3. Air, gas, or non-conductive liquid can be used to push liquidmetal into contacts. For example, you could switch sections of anantenna using air lines. It may be much cheaper than doing it electrically. I used an aquarium air pump and tubing.
4. I have tried putting a balloon inside a balloon, with liquidmetal in between the balloons. When you inflate the inner balloonthe liquid metal forms a thin shell between the balloons. This givesyou an air pressure adjustable antenna element.
Already there are patents for using liquid metal as an adjustable `'Conductivefluid ground plane`' and similar ideas. Now is the time to experimentwith using this non-toxic liquid metal. You can obtain it from severalplaces on the internet depending on the quantity that you want.
I saved the downside for last. The Gallium based liquid metalhas a problem sticking to surfaces. It does not stick in the Gerathermthermometers that use it because they claim to use a thin layer of oxide(or `'rust`'). From my experience, oxide actually appears to be partof the problem. Protecting the surface with a thin layer of oil keptit from sticking for longer. Perhaps someone can find the `'magic''solution...
However, it does not matter if the liquid metal sticks in elastic stretchablewire or balloons. That is why I am already planning to use a balloonwith a layer of liquid metal to tune a multi-band antenna I have yet tofinish. Remote adjustment is important to me because I am paralyzedand have trouble getting on my roof (it's another story).
More information is on my website:
Mike Lake - KD8CIK