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Physical bounds on antennas of arbitrary shape

Recently developed physical bounds relate antenna performance to the polarizability of the antenna structure. Although, the polarizability can be determined numerically for arbitrary objects, it is advantageous to have simple closed form expressions for canonical geometries. Here, rational approximations are presented for the polarizability of cylinders and planar rectangles.

High temperature waveguide measurements of the permittivity and permeability

This paper describes a setup for measurements of the permittivity and the permeability at temperatures from room temperature up to 1000 °C using a single rectangular waveguide. The hardware design of the setup that can handle these temperatures is developed and described. Measurements on a NiZn ferrite sample are performed in order to evaluate the performance of the setup and the procedure that is