ywxwszc
Newbie level 4

I have designed a 4 layer RF PCB with coaxial connectors to be the input and output, and now want to remove the connectors and put the antennas directly on the board.
This is the layer definition of the 4 layer PCB:

And this is the layer definition of the antenna, which contains only the first 2 layers of the PCB:

So in the antenna area, now I need to remove the lower 2 metal and dielectric layers. It is easy to remove the metal, but is it possible to remove the dielectric layers? I have never seen such designs before, and haven't figure out a way to do it.
Looking for someone to tell me "yes, it's surely possible" and how.
This is the layer definition of the 4 layer PCB:

And this is the layer definition of the antenna, which contains only the first 2 layers of the PCB:

So in the antenna area, now I need to remove the lower 2 metal and dielectric layers. It is easy to remove the metal, but is it possible to remove the dielectric layers? I have never seen such designs before, and haven't figure out a way to do it.
Looking for someone to tell me "yes, it's surely possible" and how.