double sided copper layer or one sided copper layer.

Hello
I have design and simulated a high gain microstrip antenna and i have attached the refrence paper also.
i have used the same structure as shown in side view of this paper.
so now i m going to fabricate the antenna on my own but as i am new to antenna field i want to know that, do i have to use double side copper layer FR4 or single sided copper layer FR4.
please somebody see my attached paper and guide me about the subtrate.
regards
vishal

The paper is referring to an Er=2.2 substrate, could be e.g. Rogers RT 5880. Using regular regular FR4 instead of the dedicated microwave substrate will add both dielectric and surface roughness related losses. Also the antenna properties are changed due to the higher Er.

However, if you have simulated the antenna design with reasonable FR4 parameters, you should build it from the same material. The design is apparently intended as single side PCB structure, which is the usual way for planar antennas without a ground plane.

yes, the paper is referring to RT Duroid but its a costly material and not available here so i design and simulated my structure using FR4 and i got good result with FR4 but now i have to fabricate it which i have no experience about fabrication.
i will fabricate it on my own so i have the confusion that do i have to use double sided PCB or single side.
i m confused by this. if i put it into acid for etching purpose and if i use the double side than the copper layer of the other side also be dissolved completely.