Figure 4.

Schematic of the ceramic/metal hybrid metamaterial and the linear response of the metamaterial. (a) Calculated and (b) measured transmission spectra of the ceramic/metal hybrid metamaterial. Right inset in (a): an illustration diagram of the ceramic/metal hybrid metamaterial comprised of I-shaped metal pattern placed at the center of the cross-section of waveguide, and a ceramic cuboid fixed at 4 mm away from the I-shaped film in y-axis direction. Left inset in (a): electric field distribution of the sharp trapped mode (at 8.9 GHz). Inset in (b): a photograph of the sample measured in experiment.