Title :
A tuneable, switchable dielectric grating
Author :
Bushbeck, Mark D. ; Chan, Chi H.
Author_Institution :
Dept. of Electr. Eng., Washington Univ., Seattle, WA, USA
Abstract :
Electromagnetic scattering characteristics of dielectric gratings are examined numerically using the finite-element method. The gratings are created by introducing pressurized dielectric fluid into periodic tubes within a dielectric sheet. A structure is presented which has an extremely narrow stop-band (total power reflection) immediately adjacent to a passband (total transmission). It is shown that the critical bands can be shifted by changing the fluid pressure, at a cost of only slightly less than perfect passband transmission (97%), while the rejection band remains perfect (100%). Thus, a unique tuneable, switchable frequency selective surface can be easily realized.<>
Keywords :
antenna theory; dielectric devices; diffraction gratings; electromagnetic wave scattering; finite element analysis; tuning; FEA; FEM; FSS; dielectric sheet; finite-element method; frequency selective surface; narrow stop-band; periodic tubes; pressurized dielectric fluid; switchable dielectric grating; Dielectric losses; Dielectric materials; Electromagnetic scattering; Finite element methods; Frequency selective surfaces; Gratings; Microwave theory and techniques; Optical losses; Optical scattering; Scattering parameters;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
