Various E-plane strip discontinuities are analyzed by the moment method and generalized network analysis technique. By introducing an idea of wide-sense waveguide, a united treatment of such problems is realized, and the thickness of the strip is taken into account. A set of curves for the equivalent circuit parameters of E-plane strip discontinuities are given. Two E-plane bandpass filters are designed and tested at W-band. Experimental results agree well with theoretical predictions.

An efficient hybrid field solution to microstrip transmission lines is presented by using SLE and SLM modes in spectral domain. It by-passes the lengthy process of formulating the determinant equation for the unknown propagation constant. Compared with spectral domain admittance approach, this method is clear in both physical and mathematical senses and may be applied to a variety of structures.

By using the method of Fourier series expansion, the inverse electromagnetic scattering problem of a 2-dimensional lossy dielectric body, of which the cross section is a narrow annulus, is studied. The analytic expressions of the electric parameters of a dielectric body are given in terms of the outside scattered field. And the simulative computing results are satisfactory.

An algorithm is presented for generating all directed circuits of a directed graph by the linear combination in the basic set of (1) the directed or (2) the oriented circiuts. A theorem named "principle of equality between numbers of edges and vertices" is proved. Based on this pringiple a simple method is worked out. Using it to identify the directed circuits makes the running time of the algorithm for digraphs being mainly the same as for undirected graphs.

A collocation technique with multipoint weighting is presented. It converges as-rapidly as Galerkin method but needs less computation effort. By means of the technique withGauss points (superconvergent points) as the collocating points, dipole and dipole array areanalyzed, and the numerical results obtained are in good agreement with that given in relativereference.

The methods to realize wide and narrow beams by one planar slot array and feed networks are proposed, in which the theoretical analysis and the relations between parameters of feed networks are given. Theoretical results agree with the experimental data quite well. This methods has been applied in practice.

A novel sparse matrix technique for the numerical analysis of semiconductor devices and its algorithms are presented. Storage scheme and calculation procedure of the sparse matrix are discribed in details. The sparse matrix technique in the device simulation can decrease storage greatly with less CPU time and its implementation is very easy. Some algorithms and calculation examples to show the time and space characteristics of the sparse matrix are given.

Principle of optical method of photocathode process control, which is one of pho-tocathode process monitoring techniques, is discussed. A monitoring apparatus is described and had applied to investigate the optical parameters of multialkali photoemiiter during process. Some actual schemes using the method to monitor the preparation of photocathodes are suggested.

The Fresnel approximation in phase screen model is discussed, and the -coherence function is derived for k>>K. The application condition for Rino s results is obtained, and it is |▽R_ΔNe(Δρ_s,η)|/R_ΔNe(Δρ_s,η)<<1

The expression of a few important formulas of electromagnetic fields are simplified by using the inner product and mutual energy formula.

In this paper, the normal and abnormal cylindrical vector wave functions are constructed and their conversion relations are found out. Furthermore, thte normal and abnormal vector wave functions and their conversion relations in circular, elliptic and parabolic cylindrical coordinate systems are discussed in detail, where the result in circular cylindrical coordinate system is the same as that given by Zhou Xuesong (1984).

Two classes of identity-based key distribution schemes and the corresponding con ference key distribution schemes are proposed in this paper.

Symbolic code matrix, constant matrix and count matrix are defined. The first two matrixes are used to describe the elemental expressions of augmentation matrix and the node admittance equation is thus obtained. The third matrix is used to obtain the incoming degree matrix, and all the 1-factor gains of the coates graph are given according to the matrix. Using the code data, the determinant is expanded and all the same items in the expansion are merged. Thus the symbolic network function in which no term concellation occurs is generated.

A new method of generating symbolic network functions--generalized eigenpo-lynomial method is developed. With the advantages of small computational requirements and high accuracy, the method is superior to all other existing methods used to solve the same problem.

The structure of a new OTA floating inductance simulator is given. It is simple and can be realized very easily. Its most advantage is that the volume of the inductor can be adjusted continuously by changing the bias current I_ABC. The curcuit given in this paper can be made with the monolithic integrated circuit. A kind of Caure low-pass filter is realized by using this kind of floating inductor and it is shown that the experimental results are in good agreement with the theoretical design.

The different results of removing the carbon contamination with UV/O₃from the GaAs, GaP, InP, GaInAs and GaInPAs surfaces are given.

In recent years, a remarkable progress of the research work on the electron cyclotron maser (i.e. gyrotron), which provides an efficient source for generating high power radiation at millimeter and submillimeter wavelengths, has been made. The current state of the art on gyro-devices, including gyromonotron oscillators, gyrotron amplifiers. high-harmonic gyrotrons and gyrotrons with an intense relativistic electron beam are expounded. Some existing problems, measures of solving difficulties as well as the trends of research and development in gyrotron are recommended.