Design and characteristic impedance modelling of dual band frequency selective surface (FSS) on hybrid material

The design FSS structure consists of square Frequency Selective Surface (FSS) structures placed on the FR4 and glass. The circular and square slot is added on the FSS to design and simulate by using the CST Microwave Studio software for 2.4 GHz and 5.2GHz based on industrial, scientific and medical bands (ISM) standard. The reflection (S11) and transmission (S21) of the design FSS structure is analyzed based on the six types of configuration that have been set up. The hybrid material (FR4+glass) affects the transmission and reflection of the FSS. The highest efficiency for 2.4 GHz and 5.2 GHz are 73% and 89% respectively by using configuration 2.