Gary H. Glover
University of Minnesota
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Applied Physics Letters | 1968
Keith S. Champlin; Gary H. Glover
The relative dielectric constant er of high‐resistivity GaAs has been measured at 70.243 GHz as a function of temperature between 100 and 300°K. The measuring technique utilized a circular E field (TE°01) mode reflection‐coefficient bridge. Estimated relative and absolute accuracies of the measurements are ±0.2% and ±0.5%, respectively. The results are found to fit the equation er(T) = er(0){1 + αT} where er(0) = 12.73 ±.07 and α = (1.2 ± 0.1) × 10−4. At room temperature (295°K) the relative permittivity is er = 13.18 ±.07.
Applied Physics Letters | 1967
Keith S. Champlin; R. J. Erlandson; Gary H. Glover; P. S. Hauge; Tong Lu
In a recent communication, Larrabee and Hicinbothem presented measurements of the dielectric constant of high‐resistivity GaAs showing a region of anomalous dispersion centered at 9.5 GHz. We have made similar measurements over the frequency range between 8.5 and 70 GHz but have not obtained their results. Our measurements indicate that the relative dielectric constant is independent of frequency in the microwave range and equal to 12.95 ± .10 at room temperature.
Applied Physics Letters | 1968
Tong Lu; Gary H. Glover; Keith S. Champlin
An earlier letter reported microwave (70.2 GHz) measurements of the relative permittivity er of high‐resistivity GaAs in the temperature range between 100° and 300°K. This letter extends the measurements to 600°K. Over the entire temperature range 100° < T < 600°K, the permittivity is observed to fit the expression er(T) = er(0){1 + αT}, where er(0) = 12.79 ± 0.10 and α = 1.0 × 10−4 deg−1.
Journal of Applied Physics | 1969
Keith S. Champlin; Gary H. Glover; J. W. Holm‐kennedy
The problem of mode conversion and scattering by a finite‐length section of magnetoplasma‐filled waveguide is formulated in matrix notation. This formulation becomes increasingly exact as the dimensions of the matrices (i.e., the number of modes considered) increases. The desired reflection‐ and transmission‐coefficient matrices are readily evaluated with a digital computer. Computations of TE010‐mode reflection coefficients indicate that good accuracy can be obtained with a fairly small (∼10) number of modes. Large errors result from considering only the incident (TE010) mode, however.
Journal of Applied Physics | 1966
Keith S. Champlin; Gary H. Glover
Journal of Applied Physics | 1967
Keith S. Champlin; John D. Holm; Gary H. Glover
Journal of Applied Physics | 1969
Gary H. Glover; Keith S. Champlin
Journal of Applied Physics | 1969
Keith S. Champlin; Gary H. Glover; D. E. O'Connor
IEEE Transactions on Microwave Theory and Techniques | 1970
Gary H. Glover; Keith S. Champlin
IEEE Transactions on Microwave Theory and Techniques | 1968
Keith S. Champlin; Gary H. Glover; J.D. Holm; N.A. Patrin