This paper proposes a methodology for the systematic design of single-layer multi-band frequency selective surfaces (FSSs) by mapping the desired frequency response to a canonical structure consisting of easily tuned loaded-dipole elements. Drawing inspiration from circuit and filter theory, the elements can be individually tuned in order to optimize features such as stop-band bandwidth and pass-band shape. The method under discussion is used to create and optimize an FSS for Wi-Fi applications; it has the potential to be embedded in building materials to block transmission of signals at the 2.4-GHz and 5.2GHz bands. The design is tuned to exhibit high selectivity and a completely symmetric pass-band. Validations are performed in Ansys HFSS.