The Design And Simulation Of Novel Multi-band Frequency Seective Surfaces

Frequency selective surfaces (FSS) are two-dimensional periodic arrays whichare composed of one or multi-screen (arranged with conducting patch or apertureelements) embedded in one or multi-medium. FSS are widely applied in themicrowave, infrared and even the optical bands due to its excellent spatial filtercharacteristic. With the development of wireless communication, the wide-band andmulti-band become more and more important. Thus, the design of multi-band FSSstructure becomes current research hotspot.Based on the design ideas for multi-band FSS (fractal FSS and composite FSS),the design of multi-band FSS is mainly studied and two novel multi-band FSSstructures are proposed in this thesis. Firstly, a novel four-band fractal unit FSS ispresented. It is based on Jerusalem-cross unit and can be used to transmit S/X bands,while reflect C/Ku bands. The other design is a composite-unit FSS structure withthe square and cross ring as the basic graphic unit. It can be observed that the resonantfrequencies are very stable with respect to the incident angle variation andpolarization. Furthermore, two improved composite-unit FSS are proposed in thisthesis by depressing the ring center of the outside and inside edges of this initialcomposite element FSS towards its loop center. The working frequency interval sizecan be easily adjusted as needed through the regulation of the slot depth and width.The simulation results meet the design expectations and satisfy the primaryperformance requirements. It can be as the reference data for the multi-bandcommunication of satellite communication system.