This patch antenna under test at ESA’s technical heart is designed to maintain a radio link between the two satellites making up the Proba-3 mission, allowing the pair to fly in formation to maintain an artificial eclipse of the sun.
![](https://3c1703fe8d.site.internapcdn.net/newman/csz/news/tmb/2019/anchorantenna.jpg)
Source:
https://phys.org/news/2019-05-image-anchor-antenna.html