A triple BandStop frequency selective surface for escalation in the security of WiMax and WLAN application

A bandstop FSS has presented in this paper that works at 1.8GH, 3.5GHz and 5.5GHz. The dielectric constant of 4.4mm and dimension of substrate 0.24 X × 0.24X, tangential loss 0.025 and substrate FR-4 with thickness is 1.6mm is used. The structure consist of three elements Two Squares and a Decagon engraved on the substrate and provides three stable frequency response of 1.8GHz, 3.5GHz, and 5.5GHz. The proposed design is polarization independent and has stable frequency response at various angles of incidence for both perpendicular and parallel TE and TM wave modes respectively as the structure is symmetrical. The simulated results prove that a good insertion loss at desired resonant frequency was achieved in both TE and TM mode. Simulation is carried out in CST microwave studio that is based on FDTD method in frequency domain solver.