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Nonlinear surface waves propagating along a single interface between a linear metamaterial and a nonlinear antiferromagnet are theoretically studied. The frequency response of transverse-magnetic-polarized waves covering the frequency range from the microwave to the infrared regime is investigated in detail. We find that the waveguide supports soliton-like surface waves with low-pass response in the microwave range and bandpass response in the microwave and infrared ranges. The bandwidth is a function of the nonlinearity and can be tuned by controlling the incident wave power. [ABSTRACT FROM AUTHOR]

The dielectric properties of CaCu3Ti4O12, Ba(Fe1/2Nb1/2)O3, and Sr(Fe1/2Nb1/2)O3 giant permittivity ceramics were evaluated at microwave frequencies using a modified resonant cavity method. In the frequency range between 3.4 and 9.5 GHz, the permittivities of the three ceramics were around 84.6, 43.9, and 40.4 at 20 °C and were nearly independent of frequency. The dielectric losses decreased and the Qf values increased significantly with increasing frequency. The temperature dependence of the dielectric properties was also investigated at about 6.02 GHz. With increasing temperature from -60 °C to 80 °C, the permittivities of CaCu3Ti4O12, Ba(Fe1/2Nb1/2)O3, and Sr(Fe1/2Nb1/2)O3 ceramics varied nearly linearly, and the corresponding temperature coefficients of permittivity were -700, 175, and 164 ppm/ °C, respectively. [ABSTRACT FROM AUTHOR]