I have seen the type of antenna which is mounted with the board. But i have a doubt that why is the one more plastic sheet layer which has been fixed on top of the antenna, Any specific reason for this ?
you need to read about antennas if you ask such questions.
yes, the squares are dipoles, they direct and form the signal, they don’t need to be connected anywhere. in the case of a dish antenna, the dish is also not connected anywhere, only the feed is.