最新刊期
卷 ， 期 6 ， 1985
- 摘要：The solution of characteristic parameters of polygonal microstrip antennas are investigated by the method of conformal outermapping. The outside area parameters of a polygonal microstrip antenna are transformed into the corresponding ones of a circular microstrip antenna first, then transformed inversely into the boundary values of a polygonal antenna. Thus the solution of polygonal microstrip antennas is obtained. The theoretical and experimental results are in agreements.3|46|1更新时间：2025-12-08
- 摘要：The H-algorithm for test generation of asynchronous circuits is discussed and its validity is proved. A program HALG on the basis of H-algorithm is developed on a computer of PDP-11/23, and test sequences are generated for some circuits. The results are con-sistant with the theoretical analysis.2|19|1更新时间：2025-12-08
- 摘要：A 2D superimposure sequency digital filter is presented which removes the block effect of the normal 2D sequency digital filter. From which a detailed description for the design of the 2D ideal lowpass superimposure sequency digital filter is given and also presented is the experimental result.2|63|21更新时间：2025-12-08
- 摘要：A simple and efficient algorithm for locating multiple faults in parity check circuits is presented. It is based on a new concept called "Minority Bit",and the fault location test set so obtained is optimal.The length of the test sequence is equal to the number of primary inputs plus one. The implementation of automatic generating the optimal test set and fast locating all the faults is also discussed.2|22|0更新时间：2025-12-08
- 摘要：A new active filter circuit with one operational amplifier.one capacitor and several resistors is presented.The operational amplifier pole is utilized. The circuit can fulfil the second-order lowpass, highpass, band-pass, band-stop and allpass functions. As a band-stop filter, not only the w0 and Q can be adjusted independently, the band-stop attenuation can also be adjusted. Design examples and experimental results are given.2|47|4更新时间：2025-12-08
- 摘要：X-ray diffractometry is used to determine the crystal perfection and state of the strain in InGaAsP epitaxial layers grown on （001） oriented InP substrate. The methods and the results of measurement of rocking curves in the InGaAsP/InP heterojunction are given. The improvements of measurement of lattice mismatches by means of X-ray diffractometry are presented, so that one can determine the lattice perfection of epilayers without double-cyrstal spectrometer.2|18|0更新时间：2025-12-08
- 摘要：Optical Characteristics are analyzed quantitatively for plate waveguides made on higher refractive index substrates, equations are obtained for mode propagation constant and power radiation loss etc., followed by a discussion with some concrete calculation examples.2|41|0更新时间：2025-12-08
- 摘要：The allowable bit-error number selection based on a bit error rate in correlating recognition for typical procedures of frame synchronization is described, and a stable and optimal performance of the system can be achieved in this way. In Search mode, a more complete expression of frame synchronization one-pass acquisition probability is obtained. In verification and lock modes, for compensating loss and gain in timing pulses, a multi-bit detection aperture is recommended. Finally, the allowable bit-error number when using the multi-bit aperture is analysed.2|80|10更新时间：2025-12-08
- 摘要：<正> 我国第一台自行研制的全数字仿真计算机（YH-F1型银河仿真机）最近在长沙国防科技大学通过了国家鉴定。这是我国仿真技术上的一项突破。 这台具有八十年代初期国际先进水平的仿真机,有着先进的系统结构和优异的性能指标,特别适于执行对时间要求苛刻的动力学连续系统的仿真任务。2|18|0更新时间：2025-12-08
- 摘要：On the basis of fundamental research of the electron irradiation degradation mechanism of the front-illuminated EBS-CCD, the diffirent factors affecting its lifetime limitation are analysed. Several practical ways to increase the lifetime are qiven. Experimental results are in good agreement with theoretical predictions.2|29|1更新时间：2025-12-08
- 摘要：The Monte-Carlo computer simulation is presented in solving the problem of frequency stability in modern electronic systems. Its first key procedure is generating a high quality random sequence simulating the oscillator phase noise, followed with calculation of the response of the system （mathematical model） with this random sequence on computer. After that, the required statistical estimation can be obtained. The method for designing randomsequence is discussed in detail. Finally, two examples-synthetic aperture radar and Dopplervelocity measuring system-are given to clarify the realization of computer sumulation andillustrate its versatility.2|26|4更新时间：2025-12-08
- 摘要：The electromagnetic coupling between an incident plane wave and a conducting cavity with a conducting wire in it through a small hole is studied. Bethe’s small-hole theory and thin wire approximation are applied to simplify numerical calculations. Resonant frequencies, equivalent dipoles over the hole, induced currents on the wire, and electrical fields in the cavity at resonances are derived and calculated in numerical examples.2|41|1更新时间：2025-12-08
- 摘要：The circuit tolerance design and iault analysis usually demand the knowledge of the circuit properties while the elements are getting incremental changes. The adjoint-network method may give differential sensitivities efficiently, but it can not be used in incremental situation and nonlinear circuits directly. The extension of this method is discussed.2|34|7更新时间：2025-12-08
- 摘要：<正> 电子工业部河北半导体研究所第15次科研成果鉴定会（1985年）上,有4项成果通过部级鉴定: CX591型GaAs微波低噪声场效应管 栅长0.25μm。12GHz下噪声系数小于1.2dB, 功率增益9dB;4GHz下噪声系数为0.4dB。2|6|0更新时间：2025-12-08
- 摘要：The residual correlation of the version I of the discrete cosine transform （DCT-I） is given. It is compared with the residual correlations of the version I of the discrete cosine transform （DCT-I） and of the version I of the discrete sine transform （DST-I）. Results show that the residual correlation of the DCT-I is the smallest one if the correlation coefficient ρ is mediate.2|31|3更新时间：2025-12-08
- 摘要：A sufficient and necessary condition is identified for avoiding zero pivots in the modified nodal approach with cutsets of branches whose currents are network variables. A pivoting algorithm based on this condition is described.2|20|0更新时间：2025-12-08
- 摘要：The expressions of probability density and distribution functions of signal-to-noise ratios for non-egual median signal Predetection optimum diversity combining is given and some computing results are also presented.2|46|0更新时间：2025-12-08
- 摘要：Theoretical design of the dipole cesium beam tube is discussed. The relations between these parameters, beam optics and assembly of the tube are obtained. The design is implemented and its characteristic curve is given. The Calculations by the iterative method agree with the measured results.2|29|0更新时间：2025-12-08
- 摘要：Major radio navigation systems which are currently operational or under development are presented. The performance characteristics of these navigation systems are analysed and compared. A forecast is given for the end of this century.4|341|2更新时间：2025-12-08
- 摘要：<正> 近几年来,由于离子束刻蚀技术的采用,使得石英谐振器的基波频率有了极大的提高。法国1981年公布了频率大于500MHz的基波特高频晶振的研究成果。山东大学于1983年将石英谐振器的基频提高到1000MHz以上,继而成都电讯技术研究所和山东大学共同研制了多台2|34|0更新时间：2025-12-08
- 摘要：With the help of the rotary matrix and vector superposition principles, the mechanism of the frequency reuse circular polarizer and its design method are analyzed. Data relating to its design and measured performance are presented in detail. The properties of this device meet the technical requirements of Intelsat-V’s circularly polarized frequency reuse feed network in the 4 GHz band.2|80|1更新时间：2025-12-08
- 摘要：Selective doped heterojunction transistor or high electron mobility transistor is fabricated with modulation doping material grown by a home-made MBE system. The transconductance for quasi-enhan-cement-mode devices is 60-90 mS/mm. Large negative conductance is observed with a corresponding trans-conductance of about 190 mS/mm.2|18|0更新时间：2025-12-08
- 摘要：Two kinds of discrete transforms-H/H and H/h transform are defined by means of discrete Haar transform （HRT）. Some of their properties are discussed. It is indicated that H/H transform and H/h transform are more efficient than HRT, and their fast algorithms are /aster than that of Hadamard transform （HT）.2|35|2更新时间：2025-12-08
- 摘要：An IIR digital filter is considered. Its filter characteristic can be changed according to the users’ requirement. A Canonical Signed Digit Code （CSD code） is employed in the filter. A Z-80 microprocessor is used for controlling the filter work and converting the coefficients in the BCD code into the CSD code. The Direct Data Transmission method and a Fast Shift Matrix structured by multiplexers are adapted to speed filtering rate.3|52|1更新时间：2025-12-08
- 关键词：取样锁相环;Filter;《电子学报》;数字滤波器;有源滤波器;回旋管;InGaAsP2|18|0更新时间：2025-12-08
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