We are pleased to inform you that the Young Graduate Trainee Opportunities for the 2016 YGTs have just been published on the ESA web site and will remain accessible for candidates to apply until 15/12/2015.
More information can be found in:
http://www.esa.int/About_Us/Careers_at_ESA/Young_Graduate_Trainee_Opportunities
ESA/YG-ESTEC(2015)035 – (Area 3: RF Equipment and Technologies ) are specific opportunities related to RF passive which might be of your interest.