Abstract
A brief review of the investigations at 3 cm. wavelength, carried out so far at the Indian Institute of Science, is presented. The work includes theoretical investigations on the circuit aspects of microwave cavities, perturbation effects in a cavity resonator and interaction of modes. The paper also presents a report on the results of investigations on the propagation characteristics of microwaves through a cylindrical metallic guide filled completely with two concentric dielectrics. A method of calculating the attenuation and phase constant of a hybrid (EH)11 mode propagating through an imperfectly conducting guide filled with an imperfect dielectric is also discussed. A new method for the determination of conductivity of metals at microwave frequencies is outlined. A survey of the theoretical investigations on a parallel metal plate dielectric and their experimental verifications with the help of a microwave interferometer constructed for the purpose is also given. The paper concludes with a discussion of theoretical and experimental investigations on the radial field spread, in the case of propagation of microwaves on a single wire.
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