ISSN:1050-1827    

DOI:10.1002/mmce.4570030302

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

ISSN:1050-1827    

DOI:10.1002/mmce.4570030303

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractIn the analysis of electromagnetic fields, the vector potential has important roles especially when sources exist and quantum effects occur. We have recently proposed a new numerical method for vector analysis of three‐dimensional electromagnetic fields in the time domain. This is known as the Spatial Network Method (SNM). I have already shown that SNM can be expanded to the vector potential fields with Coulomb's gauge condition by using not only the magnetic vector potential but also the electric vector potential. In this article, the unified formulation in the spatial network expression for both the vector potential and the scalar potential fields is proposed by using the Lorentz gauge condition including loss term. In the formulation, new “F” and “F*” variables are defined to utilize the correspondence between the electromagnetic scalar potential and the velocity potential in the acoustic field. As an example, the difference of internal magnetic fields in the substance with perfect conductivity or perfect diamagnetism in the scalar magnetic field is simulated. © 1993 John Wiley

ISSN:1050-1827    

DOI:10.1002/mmce.4570030304

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractA design method of an N‐way sectorial hybrid power divider is described, using the boundary element method (BEM). Scattering parameters and current density distribution on the sectorial part are obtained by BEM analysis. Isolation among output ports is much improved by putting a resistive slot in the sectorial part and resistive sheets between the adjacent output lines. The design method is verified by the six‐way power divider, which has been developed in our laboratory. © 1993 John Wiley&Sons,

ISSN:1050-1827    

DOI:10.1002/mmce.4570030305

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractAnalysis of a waveguide directional filter withNcavities is formulated in terms of the moment method. Electric fields on coupling apertures, being unknown, rigorously coupled integral equations, are established by using dyadic Green's functions. In this analysis, a virtual cavity technique is introduced as well as an approximate method to incorporate finite conductivity of cavity walls. Numerical results are also shown. © 1993 John Wiley&Sons, Inc

ISSN:1050-1827    

DOI:10.1002/mmce.4570030306

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractStrip‐line circuits at relatively higher frequencies can be considered as two‐dimensionally extended circuits rather than one‐dimensional transmission‐line circuits. Hence, the stripline circuit can be modeled as a parallel‐plate planar circuit. In this article, the following topics are reviewed and described based on the results of many researchers: (1) how to model the strip‐line circuit to a parallel‐plate waveguide circuit, which leads to a parallel‐plate planar circuit; (2) how to analyze the strip‐line modeled parallel‐plate waveguide circuit based on planar circuit equations and conventional circuit theory where mode voltage and mode current are properly defined—especially how to construct the circuit equations after dividing the planar circuit into parallel‐plate waveguides and planar junctions, and giving the corresponding the mode characteristic impedance and mode impedance; and (3) the practical analysis of a stub‐type lowpass filter and branch‐line 3‐dB hybrid with the corresponding experimental results. The good agreement between the calculated and measured results demonstrates the validity of the present method of analysis

ISSN:1050-1827    

DOI:10.1002/mmce.4570030307

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractThe rectangular boundary division method within the quasi‐TEM wave approximation is described as an analysis method to give basic parameters for designing complicated microwave transmission lines. Analysis procedures of some practical planar transmission lines are outlined and practical techniques for numerical computations with this method are discussed. © 1993 John Wiley&Sons, I

ISSN:1050-1827    

DOI:10.1002/mmce.4570030308

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractWe have developed a new method to measure noise parameters for GaAs MESFETs and HEMTs more accurately, quickly, and reproducibly than the conventional method. We also devised an improved method for automatically calculating a gate‐induced noise current, a drain‐noise current, and their correlation coefficient from the measurement noise andS‐parameters. © 1993 John Wiley&Son

ISSN:1050-1827    

DOI:10.1002/mmce.4570030309

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractCutoff frequencies of GaAs MESFETs are simulated by using a model that considers impurity compensation by deep levels in the semi‐insulating (SI) substrate. For a higher acceptor density SI substrate, an achievable cutoff frequency becomes higher because the substrate current becomes smaller. Effects of introducing a p‐buffer layer are also studied in terms of dependencies on p‐layer thickness and its doping density. © 1993 John Wiley&Son

ISSN:1050-1827    

DOI:10.1002/mmce.4570030310

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY

摘要:

AbstractThis article describes our techniques for the three‐dimensional full‐wave field simulation of the computer‐aided design of broad‐band circuits operating in the microwave and millimeter wave frequency region. After reviewing the numerical algorithm of the finite‐difference time‐domain approach, the concept of the lumped device model is introduced into the simulation. We then propose an efficient way of calculating the scattering parameters of passive elements that uses the lumped device model as a standard termination of the circuit port. The analysis of a nonlinear circuit directly combined with the field simulation is also presented, and finally, a method of simulating integrated circuits mounted in a package is discussed. © 1993 John Wil

ISSN:1050-1827    

DOI:10.1002/mmce.4570030311

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1993

数据来源: WILEY