最新刊期
卷 ， 期 6 ， 1987
- 摘要：A dual-band rectangular microstnp patch antenna with an electrically snort-circuited wall is introduced, which radiates a single broadside lobe for two bands and has a half reduction in size as compared with the coventional rectangular patch. Some design and manufacture guidelines are discussed. It is shown that the ratio of two resonant frequencies can be changed from 1: 3 to more than 1:1.8 by inserting electrically shorting pins.2|182|1更新时间：2025-12-08
- 摘要：A re-writing algorithm is developed for vectorization of loops with logical IF statements and block IF statements. According to it, many of fairly general and complicated loops are successfully recognized to reach their separate vectorized object program segments.2|19|1更新时间：2025-12-08
- 摘要：The influence of the misorientation of equi-diameter bicylinder electron lens on image quality is analyzed and the comparison with the misaligned electron lens is made. A method of evaluating the influence of misalignment and/or misorientation of electron lenses on image quality is given. The experimental results agree with the theoretical calculation.2|57|0更新时间：2025-12-08
- 摘要：: A circularly polarized （CP） two ports microstrip antenna simultaneously operated at two CP states is designed. The CP bandwidth of the antenna is increased from 0.35% to about 5%, but the antenna directivity due to the loss in the load is reduced by about 3dB. It is believed that such an advantageous trade-off for both will make this type of antenna much more usefulness, for example, in transmitting or receiving two CP waves of opposite senses simultaneously. The "crosstalk" between the two ports depends on the impurity of CP. It is about -19dB for axial ratio （AR） equal to 2dB, or -14dB for AR equal to 3dB. The method improving the isolation between two ports of antenna is also discussed.3|161|5更新时间：2025-12-08
- 摘要：The singularity expansion method is used to find the time domain response of a resistance terminated folded dipole. The time domain response of the system is derived using theory of Linear system which consists of two identical resistance terminated folded di-poles that act as transmitting and receiring antennas respectively. The calculation is in excellent agreement with the experimental results.2|26|1更新时间：2025-12-08
- 摘要：The paper presents a new modified type of linearphase FFT convolution filters with six improvements, which can eliminate complex computations and improve performance by a factor of 2.53 over the conventional algorithm. In many cases the modified type of FFT convolution filter is generally more efficient than split nesting convolution filter.2|69|1更新时间：2025-12-08
- 摘要：The method of improving adaptive lattice gradient algorithm is proposed. The fixed-point implementation of this method is discussed. In addition, an estimation of the word-length is given. The effectiveness of the improved algorithm has been verified by simulation with the application in echo cancellers.2|39|1更新时间：2025-12-08
- 摘要：The differential phase shift and insert loss and the cutoff wavelength of the LSE20 mode of phase shifter with a symmetrical loaded ferrite toroid placed in the center of a ridge-waveguide are studied. Theoretical differential phase shift is proved to be basically identical with experiment: The transcentental equations of the phase constant and the cutoff wavelength of LSE20 mode, and the insert loss formula for the three cases（ridged, back ridged and rectangular waveguide）are given. In addition, the curve of the relative insert loss ver-sue frequencies for the three different waveguide phase shifters are presented also.2|101|14更新时间：2025-12-08
- 摘要：<正> 北京电子学会单片微机开发应用专业委员会于9月3日在北京工业学院正式成立,同时举行了首届学术报告活动。该委员会是一个科研、学术、开发应用三结合的专业学会,她的成立将对推动、提高北京地区,乃至全国单片机的学术水平、技术水平和应用水平作出贡献。2|8|0更新时间：2025-12-08
- 摘要：A modified Green’s function instead of the freespace Green’s function is used as the kernel of integral equation. The modified function is derived to satisfy the conditions of a part of boundary, and the integration is then taken only along the remained part of the boundary and the elements of the final matrix equation are obtained by analytical method rather than numerical method. It results in greatly simplifying the computaion and improving the precision, and in most cases it does not need dealing with singularity problems.Numerical results of characteristic impedance of TEM strip lines and cut-off wavelength of ridged waveguides are given.2|52|4更新时间：2025-12-08
- 摘要：As one of the applications of the invariance theorem of the scattering matrix of n-port networks, a new formula of the transducer power gain of multistage amplifiers is provided and proved. Based on the formula, a computer aided design procedure is introduced for the design of multistage amplifiers.2|182|2更新时间：2025-12-08
- 摘要：Some Kalman compensation algorithms, adaptive Kalman algorithms of fading memory and estimating parameter, are introduced for adaptive arrays. One new algorithm of combining fading memory with estimating parameter is deduced on the basis of above two algorithms.2|22|0更新时间：2025-12-08
- 摘要：The algorithms based on Shore’s and Tzannes’ principles are independently derived and compared with some numerical calculation examples. A new analytical method, Ce-pstrum method, is proposed. Numerical calculation reveals that this new method is as good as that of Shor’s and Tzannes’ （unless S/N<0 dB）, but the computer time is greatly reduced. Finally, a pratical example of estimating the fluctuation spectrum of radar transmitting signal is given.2|46|2更新时间：2025-12-08
- 摘要：A new algorithm for computing a 2m×2m-point two-dimensional discrete Fourier transform is presented. The main advantage of the algorithin is the 25-71% reduction of complex multiplication compared with conventional method of a two-dimensional DFT by using one-dimensional FFT on the rows and columns separately. The fast algorithm of the generation of twiddle factor and bit reversal and unscrambling are developed as well.2|48|1更新时间：2025-12-08
- 摘要：Let L（a,M） be a n-dimension integer lattice associated with the subset sumproblem,=M. It is proved that every version of the L3-algorithm in [1,2,3] working on the L（a,M） can be actually executed at most only in O（*）/n bit operations, where O（*） is the upper bound for processing a general integer lattice with the same scale by using the algorithm[l,2,3]. Then, some results about the condition and the success rate of using the algorithm mentioned above are given.2|115|4更新时间：2025-12-08
- 摘要：The method of research and Design of 100 MHz monolithic PLL IC is described.2|44|6更新时间：2025-12-08
- 摘要：In this paper, more detailed technological experiments are discussed for determining conditions under which hFB and BVcao can be effectively controlled during fabrication of bipolar transistor, and it is deduced that the prerequisite is △σi>>△σi Then the processing methods and controlling ways for improving process controllability of hFE and BVcao are searched through the analysis o( the diffusion law and functions of the device construction.2|20|0更新时间：2025-12-08
- 摘要：BF2+ implanted Si wafers have been rapid thermally annealed using FR graphite heaterat 10001200℃ for 630s. The experimental results show that rapid thermal annealing can be provided shallower junctions than conventional thermal annealing. The diffusion of B and F dopants resulting from rapid thermal annealing have been compared with furnace annealing. Double peak of F atom depth profiles can be observed. Outdiffusion of F during recrystallization of implanted layer is the mayor cause of the double peak of F.2|19|1更新时间：2025-12-08
- 摘要：A set of filtering formulas for state estimation in velocity coordinate, in the light of data processing of the maneuver target tracking in air space with phased array radars, are derived. The simulating results show that the new method would improve the tracking performance for maneuvering targets by doubling the precision in prediction.2|53|0更新时间：2025-12-08
- 摘要：A simple method for calculating aberrations of two kinds of multipole electrostatic deflectors is presented. By selecting the parameters of the deflectors reasonably, the transverse components E2, F2 of the field distribution can be eliminated, and then the simple formulae which contain only nine terms of integral in sixteen aberration coefficients are obtained. There are no second order dervatives of the electric field on optical axis in these formulas, so high precision can be gotten.2|21|1更新时间：2025-12-08
- 摘要：This paper investigates a kind of cheap and new circuit for analogue-to-digital conversion with a performance to price ratio much higher than middle and high speed A/D converters. The bigger the bit number, the higher the ratio.2|97|5更新时间：2025-12-08
- 摘要：The iterative method reported here with the aid of FFT algorithm provides an approach for reconstructing the profiles of layered media, which can be smooth or possess discontinuities, from the reflection data in frequency domain. The reconstruction procedure can be performed in a desired region without necessity of starting the process from the boundary surface. Moreover, it is of insensitivity to the noise appearing in reflection data.2|17|1更新时间：2025-12-08
- 摘要：The directed criteria for sensitivity of stray capacitances are discussed. The methods that eliminate the influence of the stray capacitances are presented. The synthesis for the first-order switched capacitor netwerks is further investigated using the circuit blocks insensitive to the stray capacitances.2|172|0更新时间：2025-12-08
- 摘要：An analytic method of broadband machine-tuned oscillators and its numerical results are presented. The oscillators have broadband features. Using the above-mentioned results, a kind fo Ka-band broadband oscillators is developed, of which the maximum tuning bandwidth is 10 GHz.2|17|1更新时间：2025-12-08
- 摘要：An efficient technique for analysis of multiple capacitive strips with finite thickness in waveguides is presented. The relation between equivalent parameters and odd-or even-mode input admittance Yos and Yoc is established. Yos and Yoc are related to Heltz’s vector potential. The potential function is solved by method of lines. As shown by the numerical results, the present method is simple and reliable.2|52|1更新时间：2025-12-08
- 摘要：An algorithm to calculate the characteristic impedance of coaxial lines with general quasi -round sections by combining Garrick transformation with FFT is proposed in this paper.2|30|0更新时间：2025-12-08
- 摘要：The different forms of the Dyadic Green’s function in a coaxial cavity are obtained by means of the universal formula of dyadic Green’s functions2|41|7更新时间：2025-12-08
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