摘要:

AbstractThe finite‐element method is employed to carry out the numerical analysis of complex modes, as well as propagating and evanescent modes in lossless shielded microstrip lines. In this finite‐element calculation, the triangular mixed element is used. The possible electric field distributions of the complex modes are also presen

ISSN:0895-2477    

DOI:10.1002/mop.4650061602

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

年代:1993

数据来源: WILEY

摘要:

AbstractSingle and double square‐loop frequency‐selective surfaces (FSSs) are investigated to determine the effects of metallization thickness on the scattering characteristics. Results presented are computed via a spatial‐domain method of moments technique using triangular patch basis functions. To isolate the effects of metallization thickness, freestanding screens of infinite extent are consi

ISSN:0895-2477    

DOI:10.1002/mop.4650061603

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

年代:1993

数据来源: WILEY

摘要:

AbstractA variational procedure is proposed to accurately analyze the electrical quasi‐TEM parameters of coplanar waveguides, taking into account finite‐extent as well as semiinfinite lateral ground planes. The procedure leads to accurate calculations and allows comparison with results already presented for coplanar waveguides. Data for geometries incompletely analyzed in the technical literature are provi

ISSN:0895-2477    

DOI:10.1002/mop.4650061604

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

年代:1993

数据来源: WILEY

摘要:

AbstractAn analysis is presented for the optimum detection of digital pulse position modulation employing PIN‐FET receivers. The results demonstrate a sensitivity improvement of 7.2 dB over an equivalent PCM system when operating at a bit rate of 50 Mbits/s. Calculations have also been performed for a causal approximation to the optimum receiver and it is shown that this leads to only a 0.5‐dB reduction in sensitivity. Finally, receiver design implications are examined for higher bit‐rate operation and the results obtained for a 565‐Mbit/s system demonstrate an improvement of 6 dB o

ISSN:0895-2477    

DOI:10.1002/mop.4650061605

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

年代:1993

数据来源: WILEY

摘要:

AbstractAn absorbing boundary condition of second order is derived for mesh terminations conformal to the shape of the radiator or scatterer. The boundary condition is expressed entirely in terms of the principal curvatures of the termination surface and results in a symmetric system of equations when incorporated into the finite‐element functiona

ISSN:0895-2477    

DOI:10.1002/mop.4650061606

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

年代:1993

数据来源: WILEY

摘要:

AbstractIn this work we show how to implement all‐optical shuffle multihop networks with network interface units presenting a general value of inputs and outputs and taking into consideration both dedicated and shared channel

ISSN:0895-2477    

DOI:10.1002/mop.4650061607

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

年代:1993

数据来源: WILEY

摘要:

AbstractThe use of intrinsic noise parameters P, R, and C to describe the noise mechanisms present in short‐gate‐length GaAs MESFETs is well established. These parameters are, however, bias dependent, and as yet no analytic solution is available that can accurately predict this dependency. Here results are presented that show the evolution of these parameters with drain current for three practical devi

ISSN:0895-2477    

DOI:10.1002/mop.4650061608

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

年代:1993

数据来源: WILEY

摘要:

AbstractThis article presents the first experimental observation of the output resonance response of two single‐mode four‐port optical fiber loop resonators using a nonplanar 3 × 3 fiber coupler with a triangular cross section. It is found that, under a special condition of coupling strength kd = 2π/9, the output resonance responses of these two different types of fiber loop resonators are the same, and also identical to that of a same type of fiber ring resonator. The loop resonators may be used as two‐channel wavelength‐division multi/demultiplexers and optical

ISSN:0895-2477    

DOI:10.1002/mop.4650061609

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

年代:1993

数据来源: WILEY

摘要:

AbstractA simple and effective approach is presented for analyzing the plane‐wave scattering from nonplanar wire meshes. In contrast to both traditional integral equation solutions and homogenization techniques, which have a limited range of application in terms of the size of the unit cell, the present technique is applicable to structures with periodicities varying from a small fraction of the wavelength (e.g., 10−10λ0) up to several wavelengths. The technique is applied to the analysis of meshes consisting of straight wires as well as wire meshes containing helical elem

ISSN:0895-2477    

DOI:10.1002/mop.4650061610

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

年代:1993

数据来源: WILEY

摘要:

AbstractTheoretical modeling and experimental analysis of the influence of i.f. filtering on performance of optical heterodyne CPFSK systems with differential detection in the presence of phase noise are compared. It is shown that for a bit rate of 1 Gbits/s with a modulation index of 1, i.f. filtering reduces phase noise influence, leading to a significant reduction of the bit‐error‐rate fl

ISSN:0895-2477    

DOI:10.1002/mop.4650061611

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

年代:1993

数据来源: WILEY