is it the periodic stripe off the outer conductor of coaxial line? I remembered in forum someone has post similar structure, I have tried to do the simulation, but the results are very very bad. If there is any more updates please share with me.
This is an inexpensive way to make a phased array of half wave radiators. It is sometimes used by amateurs. The problem is that the phasing gets off if too many sections are used. It works better with air dielectric line.