Electrolytic conductivity of
LiBF4
has been studied in the mixed system of 1,3‐dioxolane with 1,2‐dimethoxyethane or with tetrahydrofuran. Relative permittivity (dielectric constant) of the solvents suggested the formation of associated ion pairs in the systems, but the conductivity measured was higher than that expected from the viewpoint of ionic association. Conductivity maxima were observed in the solutions containing about 1:1 (by volume) mixed solvents. Viscosities of the solvent and the solution were also measured, and their contribution to the conductivity change with the solvent composition was discussed. Solute concentration dependence of the molar conductivity was specific for the ether solutions. Apparent activation energy for conduction, which was determined by the temperature dependence of the conductivity, varied with
LiBF4
concentration. Structural specificity of the mixed ether solutions was discussed with these parameters and 1H NMR spectra of the solutions.
of the effects of a resistively coated upper dielectric layer on the propagation characteristics of hybrid modes in a waveguide shielded microstrip using method of lines," IEEE Trans. . L. Foo and P. P. Silvester, "Boundary-marching method for discontinuity analysis in waveguides of arbitrary cross section," IEEE Trans.Abstract-A =4 rectangular-waveguide resonator of square cross section filled with high-permittivity ceramics has two degenerate lowest modes. A dual-mode bandpass filter based on this structure is studied, focusing on the attenuation poles at both sides of the passband. It is described how to achieve capacitive and inductive coupling between dominant modes of a resonator of square cross section. An equivalentcircuit model is proposed, including mode coupling, excitation from the external circuit, and direct coupling between input/output (I/O) electrodes. Equivalent-circuit parameters are measured and their validity is verified using simulated result. Appearance and annihilation of the attenuation poles are successfully explained by the proposed model, and attenuation pole frequencies are controlled by shifting the I/O electrode transversely.
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