High power gyrotrons using oversized cylindrical resonators, tapers and waveguides are subject to provide a multi tude of modes. For characterisation of the gyrotrons under development a measuring system is required to identify the individual modes in an arbitrary TEmn mode mixture and to determine fractional power contributions. The new method uses four sensors spatially distributed in the far-fi

The characteristic equation of plane and circular metallic waveguides is solved. Asymptotic expressions of the main propagation parameters are proposed for the different modes. These results can be used to the design of waveguide lasers. 

In the field of microwave integrated circuits (MIC) the problem of characteristic impedance defini tion has been treated in numerous papers. However, in all publications up to now reciprocity has been assumed. In the present paper, problems concerning the characteristic impedance defini tion of nonreciprocal lines are discussed. Especially for slot- and fin-lines and components with ferrite substr

In this paper we describe the method to solve rigorously Maxwell equations and to analyse numerically dispersion characteristics and electromagnetic field distribution of main and higher modes of open and screened regular waveguide structures in d.c. longitudinal magnetizing field. Waveguide structure may have cross-section of any intricate shape and gyrotropic filling. We've numerically analyzed

An exact solution of the boundary-value problem of coaxial circular guide, loaded with azimuthally magnetised solid-plasma is constructed' in terms of confluent hypergeometric functions. The normalized phase characteristics of gyrotropic guide, presented graphically permit a choice .of material and structure parameters in designing nonreciprocal sOlid-plasma devices for millimeter waves. 

The mode propagation constants in hollow oversized circular waveguides with low-conductivity wall material are derived. The variations of these propagation constants versus electrical characteristics of the guide material are studied. The results allow to determine optimal materials for lowloss mode-transmission. 

This paper presents an analysis of the inset dielectric guide which is an easy to manufacture transmission medium for microwave and millimetre waves. Transverse Resonance Diffraction is used to form a system of two coupled integral eigenvalue equations for the propagation constant. This system is solved by the Galerkin's method leading to a scalar transverse equivalent circuit for the mode of prop

A computer aided design of a rectangular waveguide H20 - H10 mode transducer is described which consists of an asymm etric narrow-wall coupler with branch lines of unequal length and width. The theory is based on the method of field expansion into orthogonal eigenmodes which includes higher order mode excitation and coupling effects at the discontinuities in the computations. Numerical optimizatio

A method is presented to calculate the multimode scattering matrix of a continuous tapered rectangular waveguide transition. The method is based on approximating the transition by cascaded uniform waveguide sections, determining the scattering matrices of their junctions by a mode-matching method, and combining the matrices to yield the overall scattering matrix. The effect of non-propagating mode

A triple planar integrated circuit filter with all-metal inserts and an additional abrupt waveguide step-wall discontinuity is introduced which achieves ultra-broadband high attenuation in the second stopband. The theory is based on field expansion into suitable eigenmodes which allows direct inclusion of both the higher-order mode interaction at all step discontinuities and the finite thickness o