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1987 Vol. 9, No. 4

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Articles
A NEW METHOD FOR COMPUTING RADIATION FIELDS OF REFLECTOR ANTENNASCHEBYSHEV- BESSEL SERIES TECHNIQUE
Yi Li
1987, 9(4): 289-298.
Abstract:
A fast convergent series---Chebyshev-Bessel series for representing the radiation integral ofphysical optics is constructed. It can be effectively applied to analyse the radiation fields ofreflector antennas.
THE CUT-OFF FREQUENCY AND MODE CHART OF IMAGE WAVEGUIDE
Zhou Wenbiao
1987, 9(4): 299-308.
Abstract:
The normalized cut-off frequencies of Eypq and Expq modes for image waveguide arc investigated by EDC method. A generalized mode chart for image waveguide is given. It is useful for determining the first-order higher mode and single mode region and c...
ANALYSIS OF 2-D ELECTROMAGNETIC BOUNDARY PROBLEMS WITH A COMPOUND RECTANGULAR CROSS-SECTION BY THE METHOD OF LINES
Hong Wei
1987, 9(4): 309-316.
Abstract:
A method based on the method of lines which discretizes a partial differential equation (PDE) into a system of ordinary differential equations (ODEs) is presented. A difference scheme with an error of O(h4) is introduced and a simple method for deter...
ANALYSIS OF SOME PROPAGATION PROPERTIES OF INSULAR DIELECTRIC WAVEGUIDE
Jiang Dinghua, Shi Meiqi
1987, 9(4): 317-322.
Abstract:
The conditions for four lower modes existing in an insular dielectric waveguide are given. The parameters which affect the propagation properties Of the insular dielectric waveguide are selected optimally by the improved Orthogonal Array Table (OAT)....
INCREMENTAL MATRIX ALGORITHM FOR CALCULATING SENSITIVITIES OF NETWORK FUNCTIONS
Li Feng
1987, 9(4): 323-334.
Abstract:
In this paper, a new algorithm called incremental matrix algorithm for calculating sensitivities of network functions is presented. By use of this algorithm, both difference and differential sensitivity can be calculated. The algorithm can be used in...
CALCULATION OF LARGE-CHANGE SENSITIVITY
Wang Yuhong, Zheng Huanqun
1987, 9(4): 335-347.
Abstract:
A new method of calculating the large-chang sensitivity--hybrid matrix method is proposed. This method, is based on the hybrid matrix equation of the linear m-port network with controlled sources. It can be used for the circuits containing VCVS and C...
STUDY ON THE ROLE OF CALCIUM OXIDE AND SCANDIUM OXIDE IN THE IMPREGNATED BARIUM ALUMINATE CATHODE
Wu Zhaohao
1987, 9(4): 348-358.
Abstract:
The role of calcium oxide in the barium aluminate and that of calcium oxide and scandium oxide both doped in the impregnated barium aluminate cathode are analytically studied. The results indicate that there are common consitituents, i.e. 2BaO CaO Al...
A SCANNING LOW ENERGY ELECTRON PROBE FOR MEASURING THE SECONDARY EMISSION OF THERMIONIC CATHODES
Yang Lingyun, Mao Duli
1987, 9(4): 359-363.
Abstract:
For this probe, the beam spot diameter of the primary electron beam is 50-100m, the primary beam current is lower than 10-7A, and the energy of the primary electron (Ep) can be varied from 200 eV to 3 keV.By use of this probe, the secondary emission ...
A NEW GUN FOR CATHODE LUMINESCENT INSTRUMENT
Zhang Yide, Xu Bo and Wang Yuzhi
1987, 9(4): 364-367.
Abstract:
This paper introduces the design and the manufacture of a new type gas discarge gun for the cathode luminescent instrument. It contains the decision of the operating model, the design of the discharge gun and the measurements of the gun performance. ...
SOME NOTES ON JOHNSON BOUND AND GRAHAM BOUND OF CONSTANT WEIGHT CODES
Yang Yixian
1987, 9(4): 368-370.
Abstract:
Four classes of constant weight codes which can meet the Johnson upper bound and two classes of constant weight codes which are greater than the Graham lower bound are given in this paper.
MONTE CARLO SIMULATION ANALYSIS OF EFFECT OF POWERMETER ERRORS ON MEASURING ACCURACY OF SIX-PORT REFLECTOR
Gu Haoran
1987, 9(4): 371-374.
Abstract:
It is important that the powermeter errors will exert a tremendous influence on the measuring accuracy of six-port reflector. To estimate this influence is very difficult. In this paper, Monte Carlo simulation analysis is used. As a practical example...
A MICROWAVE POLAR INTERFEROMETER USING FOUR-PROBE PRINCIPLE
Liu Qishan, Zhuang Yiyuan, Hu Zhengyi, Zhang Zhaotang
1987, 9(4): 375-379.
Abstract:
A microwave polar interferometer using four-probe principle is presented, in which four-probe system is replaced by two T-junction waveguides in series with a tunable phase shifter between them. The interferometer is specially suitable for measuring ...
BOUNDARY VALUE PROBLEMS OF ANTENNAS IN METALLIC ELLIPTIC AND HYPERBOLIC CYLINDERS
Mao Kanghou
1987, 9(4): 380-384.
Abstract:
Some new formulas for calculating the far zone field of antenna of any length excited by horizontal electric and magnetic sources on the infinite metallic elliptic and hyperbolic cylinders are presented. As an example, the radiation patterns for a st...