Invisibility Cloak Made To Measure

doomed to fail at visible light frequencies. Can be made to work at microwave frequencies

In reading the article, I am left with the impression that any objects that this would be used on would need to be of a certain shape. How would this allow the principle to be applied to objects of other shapes?

If only microwaves are affected in would still be of interest to defence forces as microwaves are often used for targeting. The article only speaks of being back lit by the radiation, I wonder how it would work for reflectivity?

I suspect this method will find use in target spoofing in the microwave area. Shift a target a few feet to a radar eye view and something may miss a target, which is good if we are the target and bad if the enemy can shift his perceived position.

There is nothing new in this concept, from WW2 when 'window' was used to dominate early German radars with false echoe.

Since then radars have gone up freuqncy and up agile, but there may well be a way in these to spoof.