摘要:

AbstractWe present a new large/small signal equivalent circuit for semiconductor lasers, valid for above‐ as well as below‐threshold operating conditions, based on the monomode rate equations and a polynomial approximation of Fermi integral. The model is thus valid for conditions of large injection. Results obtained by this model match perfectly those obtained by numerical integration of the rate equations. The equivalent circuit is easy to implement and solve on a nonlinear circuit analysis software such as SPICE and consequently allows the study of the parasitic effects as well as the laser behavior in complex circuits. Comparison between this model and previously published models is presented. The model is applied to the study of various heterojunction laser diodes, the experimental results of which have been published elsewh

ISSN:0895-2477    

DOI:10.1002/mop.4650031102

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

年代:1990

数据来源: WILEY

摘要:

AbstractA simple analytical model is developed for a slow‐wave monolithic microwave variable phase shifter. Propagation characteristics of the phase shifter were evaluated using this model and were found to be in excellent agreement with the experimental results of Neidert and Krowne. The model permits changing various parameters to optimize phase‐shifter performance with relative e

ISSN:0895-2477    

DOI:10.1002/mop.4650031103

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

年代:1990

数据来源: WILEY

摘要:

AbstractTwo novel kinds of circles on the Smith chart are introduced, which allow, in designing low‐noise microwave amplifiers, taking into account the level of the input match. Outlines of design procedures for using these circles are also give

ISSN:0895-2477    

DOI:10.1002/mop.4650031104

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

年代:1990

数据来源: WILEY

摘要:

AbstractThe second harmonic generation efficiency has been calculated in a number of II‐VI‐compound semiconductors under high‐field condition by approximating the velocity‐field characteristics by a power‐series relation. It is found that the second harmonic generation efficiency is much higher in these materials than in the elemental or IIIV compound semiconductors. Also, because the carrier relaxation times are lower in these materials, they can be used for efficient harmonic power generation in the infrared‐ and millimeter‐wave

ISSN:0895-2477    

DOI:10.1002/mop.4650031105

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

年代:1990

数据来源: WILEY

摘要:

AbstractThe influence of transverse electromagnetic (TEM) waves on dielectric encapsulated semiconductor devices is not attracting engineers' attention. It is found that the parameters of dielectric encapsulated semiconductor devices may degrade when these devices are radiated by TEM waves even though they are open circuited. Our experimental data exhibit that parameter degradations depend on the electric field strength and radiation time. Some discussions on these results are also given in this article.

ISSN:0895-2477    

DOI:10.1002/mop.4650031106

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

年代:1990

数据来源: WILEY

摘要:

AbstractThe effect on conductor loss of metallization edges with a trapezoidal shape instead of rectangular, as commonly occurs from ordinary fabrication techniques, is examined for the case of open coplanar waveguide. Depending on the geometric parameters, this can increase conductor loss by a significant amount.

ISSN:0895-2477    

DOI:10.1002/mop.4650031107

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

年代:1990

数据来源: WILEY

摘要:

AbstractThe circular disk microstrip antenna with an airgap between the dielectric substrate and the ground plane is formulated using the spectral domain method. The complex resonant frequencies of the structure is determined using Galerkin's procedure. Some available experimental data are compared with the present method.

ISSN:0895-2477    

DOI:10.1002/mop.4650031108

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

年代:1990

数据来源: WILEY

摘要:

AbstractNumerical solutions to the electric‐field integral equation (EFIE) for a thin wire are obtained by a Nystrom method. The singular EFIE is treated by subtraction of the singularity and a thin‐wire integral equation convenient for numerical solution is obtained. Solutions for exact and approximate EFIE kernels are compa

ISSN:0895-2477    

DOI:10.1002/mop.4650031109

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

年代:1990

数据来源: WILEY

摘要:

AbstractThe moment method computation of the input impedance of dipole antennas, obtained using numerically generated source models which are more closely related to the actual physical shape of the antenna feed region, are discussed.

ISSN:0895-2477    

DOI:10.1002/mop.4650031110

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

年代:1990

数据来源: WILEY

摘要:

AbstractA new method of measuring the RCS of a target in a general laboratory by means of a six‐port technique and a new error‐correcting model is given. The six‐port reflectometer testing RCS circuit and the experiments used are also

ISSN:0895-2477    

DOI:10.1002/mop.4650031111

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

年代:1990

数据来源: WILEY