Compared with the traditional split-ring resonator reported by Pendry et al. (IEEE Trans. Microw. Theory Tech. 47:2075, 1999), the co-directional split-ring resonator, which has inherent low mutual coupling between its outer and inner rings, can
provide distinct dual-band magnetic resonances. In this paper, we analyzed and compared different types of split-ring resonator,
but selected the co-directional split-ring resonator for the tri-band magnetic resonator design because of its attractive
dual-band magnetic resonance characteristics. We then accommodated the rings’ resonant strengths in the co-directional split-ring
resonator to be nearly equal, and added an arm-loaded ring to design a new tri-band magnetic resonator. Finally, we designed
and experimentally demonstrated a broadband μ-negative planar material with low frequency dispersion, which consisted of three pairs of tri-band magnetic resonators with
slightly different dimensions. 相似文献
The irradiance-moments characterization of off-axis Gaussian beam combinations is presented in use of the Wigner distribution function (WDF). Analytical expressions for the propagation through an optical paraxial ABCD system, beam propagation factor (M2 factor), beam width, far field divergence angle and kurtosis parameter of the resultant beam are derived and illustrated with specific numerical examples. It is reexamined that a flat-topped irradiance profile of the resultant beam can be achieved at a certain plane by appropriately choosing beamlet parameters. As compared with previous work, our results show the advantage of using the WDF and irradiance-moments methods. 相似文献
A capillary zone electrophoretic (CZE) method with diode-array detection has been established for analysis of mismatched double-stranded oligonucleotides, poly I:poly C12U, in beagle serum. The effects of sample pretreatment, buffer pH, buffer concentration, and applied voltage on the separation of inosine were optimized. Baseline separation was obtained for inosine within 11 min by use of 0.05 mol L?1 borate running buffer, pH 9.60, and an applied voltage of 25 kV at 25 °C; the detection wavelength was 254 nm. To evaluate the performance of the method and demonstrate the utility of the approach, an experiment was designed in which poly I:poly C12U were added to serum at different concentrations, artificially creating groups of samples. The proposed CZE method seemed a powerful technique for kinetic study of poly I:poly C12U in serum. 相似文献
A capillary zone electrophoretic (CZE) method with diode-array detection has been established for analysis of mismatched double-stranded oligonucleotides, poly I:poly C12U, in beagle serum. The effects of sample pretreatment, buffer pH, buffer concentration, and applied voltage on the separation of inosine were optimized. Baseline separation was obtained for inosine within 11 min by use of 0.05 mol L−1 borate running buffer, pH 9.60, and an applied voltage of 25 kV at 25 °C; the detection wavelength was 254 nm. To evaluate the performance of the method and demonstrate the utility of the approach, an experiment was designed in which poly I:poly C12U were added to serum at different concentrations, artificially creating groups of samples. The proposed CZE method seemed a powerful technique for kinetic study of poly I:poly C12U in serum.