UNIAXIAL DIELECTRIC RODS IN CYLINDRICAL CAVITIES.
POLYTECHNIC INST OF BROOKLYN N Y MICROWAVE RESEARCH INST
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In frequency regions well above the lowest resonant frequencies of a circularly cylindrical cavity, the mode density, i. e., the number of modes within a given, relatively small frequency interval, is generally quite high, and the identification of experimentally found resonances with specific cavity modes cannot usually be accomplished by frequency considerations alone. Two techniques useful in such identifications are presented here. One of these can be employed to gain information concerning the angular periodicity, of the mode, while the other gives an indication of its axial periodicity. A new method of measuring the dielectric constants tensor of a uniaxial material, which is based on the exact solution of a large dielectric rod located in a circularly cylindrical cavity is also presented. The characteristic equations required in this connection have been derived and are given. The techniques for identifying modes, as well as the dielectric constant measurement method, have been tested against theoretical computations as far as this is possible and have been found to be sound. Explicit values for the X-band dielectric constants of ruby have been determined experimentally. Author