最新刊期
卷 ， 期 9 ， 1994
- 摘要：This paper describes a Markov estimate method for eliminating the effect causeed by the noise of Non-Zero-Mean on the measurement result.Less calculating amount is needed with this method than usual ones for estimating median of the measured signal.An example is given to verify the effectiveness of the method.关键词：Non-zero-mean noise;Markov estimation;signal processing;Median2|134|2更新时间：2025-12-08
- 摘要：The Augmented Harmonic Balance Method（AHBM）is developed for analysis of the general nonlinear microwave circuits.The concepts of differential linearized network and nonlinear adjoint network are introduced so that the formulation,computation and implementation of AHBM are rather simple and efficient and the program can be developed straightforward based on the existing frequency-domain linear microwave circuits CAD software.For the circuits of multistage structure,the relaxation technique based on AHBM is proposed to reduce the storage requirement.关键词：nonlinear microwave circuit;Harmonic balance;sensitivity;Relaxation method4|202|0更新时间：2025-12-08
- 摘要：The theoretical analysis of the π-type slow-wave structure for TWT is worked out by using the field-matching method.The dispersion characteristics and the coupling impedance of this structure,which has a 15% bandwidth,no"Rabbit Ears"efffect and 100kW even more peak power handling ability,are discussed.It is shown that the theoretical calculation is in a good agreement with experimental results.After putting the straps which can ensure the operation of TWT’s dominate mode,their influence on the dispersion of the structure is also given.This theoretical method can be used for the analysis and design of π-Structure.关键词：Slow wave structure;Field-matching method;Travelling wave tube2|57|0更新时间：2025-12-08
- 摘要：The Paper describes a method of analyzing rotative symmetric multi-port junction by use of generalized mode.The mapping relation of mechanical structure electromagnetic field distribution and network parameters from minimum elemental structure is built by a rotative operator.The generalized intrinsic mode and impedance of elemental structure are calculated by Network-Boundary Element Method. At last,the structure,intrinsic impedance and equivalent network of a five-port junction are analyzed.关键词：Rotative symmetric;Rotative operator;Generalized intrinsic mode;Network-Boundary element method;Network parameter;Distribution of field;Six-port measurement2|38|0更新时间：2025-12-08
- 摘要：As the dielectric parameters of heated materials are usually temperature dependent,a nonlinear modeling for microwave heating is proposed in this paper.The modeling is based on an alternateiteration approach to solve a set of coupled nonlinear electrical and thermal differential equations,which describe the microwave heating process.Numerical examples are given to show that the method can be a powerful tool in the accurate analysis of microwave heating.关键词：Microwave heating;Nonlinear modeling;FD-TD3|248|24更新时间：2025-12-08
- 摘要：The three dimensional magnetic field and field parameters H0,H2,H4 produced by deflection yoke with several ferromagnetic loops are calculated by using the boundary element method（BEM）.These ferromagnetic loops may be of rotational symmetry（such as Toroid core）or multipolar symmetry（such as CROSS）.Fourier harmonic analysis method is used to transform the three dimensional integral to two dimensional integral.It can save the memory units and the calculating time of the computer.The singularities in calculating the diagonal elements of the matrix are manoeuvred to obtain accurate result.As an example,a parallel saddle coil with several ferromagnetic loops has been calculated in this paper.The theoretical calculated results of the field parameters coincide very well with the measured results by our new designed deflection magnetic field measuring instrument.关键词：场参数;偏转磁场;多段磁介质;边界元法2|45|0更新时间：2025-12-08
- 摘要：The vector wave function expansion combined with the unimoment method is applied to calculate the scattered fields of buried objects of arbitrary shape or of inhomogeneous material.Computational examples,for the excitation of the incident plane wave,are given for the case of free conducting sphere,buried conducting sphere and buried dielectric covered obtuse cone,Results of computation bear out the vahdity of the technique.关键词：Complex object;Buried object;The three dimensional unimoment method;The vector wave function transformation;Scattering Property2|56|2更新时间：2025-12-08
- 摘要：Study and computation of transient electromagnetic propagation and scattering in dispersive media are difficult,especially,the direct analysis in time-domain.A modified finite-difference in time domain（FD-TD） method for computation of transient propagation and scattering fields is presented in this paper.The results obtained from this way are visualable and faithful,and an efficient direct way of numencal modelling to study the characteristic of transient fields in dispersive media and the wideband problems in research fields of target detection,eletromagnetic compatibility and stealth technology is provided as well.关键词：FD-TD method;dispersive media;Transient EM fields2|193|12更新时间：2025-12-08
- 摘要：An analytic study of a perfectly conducting spherical resonant cavity loaded by an eccntric dielectric sphere is proposed in this paper.With the introduction of addition theorems for vector spherical harmonics,the method employed here is rigorous for arbitrary modes ,relative dimensions of the structure,as well as dielectric properties.TE,TM and hybrid modes are carefully evaluated and their dependence on geometric parameters and material properties is specifically illustrated.Field distributions of some modes are obtained.The reliability of the analysis is justified.关键词：Spherical harmonic;addition theorem;resonant frequency2|50|0更新时间：2025-12-08
- 摘要：An antenna array using gap-coupled patches as the elements is proposed.The input impedance characteristics of single patch and gap-coupled patches are analysed by use of dyadic Green’s function for grounded dielectric slab and moment method.The input impedances of gap-coupled patch array are obtained by combination with the antenna elements and the feeding networks that consist of divider tees,bends and feed line.According to the surface currents solved from the integral equation,the far field patterns of gap-coupled patch arrays are calculated.The compariscn with the ordinary rectangular patch arrays is made.The agreement between theoretical and experimental data is quite good.All microstrip antennas have been designed and fabricated on substrate with εr=2.86.h=1.5mm.关键词：Microstrip antenna array;Patch antenna;Gap-coupled;broadband;input impedance2|261|3更新时间：2025-12-08
- 摘要：A method of analysing and calculating the Radar Cross Section（RCS） for Complex aircraft targets is presented and verified.The method utilizes a computer program for modeling targets’geometry in terms of surface fitting.The actual exterior surface can be accurately modeled with spline function and divided into a lot of small surface elements. The scattering field calculation is based on the Physical Optics approximation for standard surface sheet.The total scartering field of the target can be obtained by using phase synthesis.The modeling procedure and some examples are given to verify the validrty of the method and presentation is limited to monostatic case for perfectly conduction targets.关键词：radar cross section;Complex aircraft target;Surface fitting;physical optics2|277|18更新时间：2025-12-08
- 摘要：Theoretical analysis and experimental results show that the LFM-CW radar can achieve the property of equivalent quadrature channels by its single channel structure,which provides a theoretical basis for simplifying the structure of coherent LFM-CW radars.关键词：Quadrature channels;LFM-CW radars;Homodyne;coherence2|249|19更新时间：2025-12-08
- 摘要：In this paper,the theory and experiment of a new kind of millimeter wave quasi-optical power combiner,that is,compound quasi-optical power combiner are studied.It is shown that it has higher output power and combining efficiency because of the improved impedance-matching of diodes and increased jection-locking power.At 35.6GHz,the output power and combining efficiency of the quasi-optical power combiner including four Gunn diodes are 816mW and 96.3%,respectively.And the mechanical tuning range（≥100mW output）is about 860MHz.关键词：millimeter wave;Quasi-Optical cavity;Power combining technology2|172|9更新时间：2025-12-08
- 摘要：The detailed further diseussion for the theory of lossy networks is made in this paper in the view point of great numbers.The results show that,except the inequality constraint derived from the positive definite property of the Hermite matrix,there exists another important kind of statistics constraint for the characteristic phase of lossy networks.To analyse the phase distributions of lossy networks,the concept of equal lossy level networks is introduced,and the properties of equal lossy level networks are discussed rigorously.The present experiment results fit very well with the theoretical ones.关键词：Lossy networks;S parameters;Characteristic impedance;Statistics constraint2|133|2更新时间：2025-12-08
- 摘要：A desired pattern factor can be regarded as a superposition of a set of"sub-array factors",each linearprogressing phase and weighting amplitude.The main-beam of each sub-array corresponds to a certain space sampling point.The sum of all space hamonic currents is the excitation which corresponds to the desired pattern.By adjusting the number of space hamonic,the weighting coefficients and the positions of sampling points,the required pattern can be obtained.Finally,an example is given for illustrating this method.关键词：ntenna array;pattern;Synthsis method of Pattern2|252|7更新时间：2025-12-08
- 摘要：In this paper,the rigorous and approximate solution of the field components for the dominant mode in a sectorial waveguide are investigated. Assuming only dominant mode to be propagated,the formula of the resonant conductance for longitudinal shunt slots cut in the curved broad face of the waveguide is derived by using equivalence principle.The example is presented and the result obtained is quite satisfactory,when the formula is used to design linear slot array.关键词：Sectoral Waveguide;slot antenna;Resonlant conductance2|123|5更新时间：2025-12-08
- 摘要：This paper analyzes the scattering wave of the object by using the geometrical theory of diffraction,and studies the character of Applebum array in the scattering environment.The results show that the character of the array is good in most time,but when the main lobe of the pattern is affected seriously by the scattering wave of the object,the ratio of S/N of the array will be limited and the array’s pattern will be bad.关键词：scattering;conformal array;Adaptive array3|124|4更新时间：2025-12-08
- 摘要：By means of εh and μh,we consider the coupling interactions of dipolars,the previous theory is extended to the case of elliptical scatterer containing a enclosing layer.Meanwhile,this paper gives out a formulation,which can calculate the effective EM parameters of the media from the ordinary media to containing metal or carbonyl iron particles in a media.Theoretical results are in good agreement with the experimental ones.关键词：Interaction of dipolars;Carbonyl iron particles;Random mixture media;Effective EM parameters2|335|18更新时间：2025-12-08
- 摘要：In this paper,we discuss a method of generating the 2-D complex random sequence with power spectrum and eigenspectrum approximated to given power spectrum and eigenspectrum,and with amplitude obeyed to the bimodal Rayleigh distribution. The method is very useful in the design and performance estimation of airborne phased array radar system.Here,some new problems which exist in the procedure of generating 2-D clutter are explored in detail,and a new requirement of testing 2-D clutter is given.关键词：airborne phased array radar;2-D clutter;simulation2|151|11更新时间：2025-12-08
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0