Gain enhancement of a wide slot antenna over a wide frequency band using a low profile. second order bandpass frequency selective surface (FSS) as a superstrate is presented in this paper. The proposed multilayered FSS with non-resonant unit cells in each layer allows in-phase transmission of waves radiated from the antenna over a 3dB bandwidth of about 50%. The design allows an enhan... https://lockdownsecuritycanada.shop/product-category/key-fob-shell/