THE OPTIMAL MAGNETIZING FIELD DISTRIBUTION FOR FERRITE DUAL-MODE DEVICES

The optimal magnetizing fields of the variable polarization effects of ferrite are studied by using thecoupling-wave(cw)theory,vaiational principle and optimization techniques.Several kinds of shapes of themagnetic line of force and some valuable results of the optimal magnetizing field are given.The theoretical cal-culations are in good agreement with the experimental results.     

OPTICAL EFFECTS AND MICROSTRUCTURE OF BURIED INSULATOR LAYER FORMED BY O~+ AND N~+ CO-IMPLANTATION

The microstructure and optical properties of a buried layer formed by O~+(200keV,1.8×10~(18)/cm~2)and N~+(180 keV,4×10~(17)/cm~2)co-implantation and annealed at 1200℃for 2 h have been investigated by Auger electron,IR absorption and reflection spectroscopicmeasurements.The results show that the buried layer consists of silicon dioxide and SiO_x(x< 2)and the nitrogen segregates to the wings of the buried layer where it forms an oxynitride.Bydetail theoretical analysis and computer simulation of the IR reflection interference spectrum,therefractive index profiles of the buried layer were obtained.     

ANALYSIS AND COMPUTATION OF THE MAGNETIC FIELD PRODUCED BY NON-RADIAL DEFLECTORS

Analytical expressions are given for computing the magnetic potential and charac-teristic functions produced by the non-radial deflectors.These expressions are useful for designingthe defiectors such as those used in the color picture tubes and the electron beam lithographysystem.The computing results are in agreement with the measured values.     

ANALYSIS OF THE DISTRIBUTION OF GAP INTERACTION IMPEDANCE COEFFICIENTS OF RESONANT COUPLED CAVITY OUTPUT SECTION OF BROADBAND KLYSTRONS

From the lumped circuit elements point of view,the distribution of gap interaction impedancecoefficients of resonant coupled cavity output section of broadband klystrons is analyzed.The following topics are discussed:(1)the selection of equivalent circuit;(2)the calculation ofimpedance distribution with given parameters of the lumped circuit element;(3)the calculation oftransfer impedance and microwave circuit parameters with measured self-impedances.     

DERIVATION OF THE GENERAL FORM OF DYADIC GREEN''''S FUNCTION FOR ELECTROMAGNETIC FIELD BY MOMENT METHOD

The general solution of the boundary value problem of the electromagnetic field in a regularboundary condition is got by moment method,and then the general form of the dyadic Green's functionis derived in this paper.By the moment method not only the regular boundary condition problem ofelectromagnetic field can be solved,but also some electromagnetic fields in complex systems may besolved.     

VIRTUAL-RAY METHOD AND ITS APPLICATION IN THE PLANE WAVE SCATTERING BY AN IMPEDANCE WEDGE

The virtual-ray method for treating HF electromagnetic scattering problems is derived from the plane wave of free space, and using this the plane wave scattering by an impedance wedge is studied. In the solution process a novel concept of generalized circle is introduced so that the complete amplitude function is obtained. And a reasonable physical interpretation for the term W2, which was neglected previously, is given. The calculated results agree well with those of the analytical solution obtained by G.D. Maliuzhinets(1958).     

THE MEASUREMENT OF COMPLEX PERMITTIVITY OF ANISOTROPIC DIELECTRICS BY MEANS OF AN ELECTROMAGNETIC OPEN RESONATOR

By applying the perturbation method and the complex-source-point theory, the theoretical research of measurement of complex permittivity of uniaxial anisotropic materials by means of an electromagnetic open resonator has been made, and the double refraction phenomenon due to anisotropy of measured dielectric materials has been quantitatively analyzed. Finally, measurements have been made on some single-crystal quartz specimens using an automated open resonator measurement system at 8mm band.