摘要:

AbstractAn analysis of the radiation properties of the Fresnel‐zone plate antenna (FZPA) and the parabolic reflector antenna (PRA) is presented using the Kirchhoff diffraction theory. Expressions are derived for the vectorial far‐field radiation patterns of both antennas. Some computed co‐ and cross‐polar patterns are shown. The most important differences between the radiation properties of the FZPA and PRA are revealed and discussed. The results of the analysis give good insight into future applications of t

ISSN:0895-2477    

DOI:10.1002/mop.4650050202

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

年代:1992

数据来源: WILEY

摘要:

AbstractA single‐screen double‐square‐loop (DSL) frequency selective surface (FSS) has been developed and tested for triband applications (i.e., to reflect the X‐band and to pass the S‐ and Ku‐band waves). Good agreement between predicted and measured transmission performance is obtained for the DSL FSS on a 0.001‐in.‐thick Kapton with/without a flat Kevlar honeycomb sandwich panel. It is found that this single‐screen DSL FSS with/without the Kevlar honeycomb has a resonant frequency near 8.4 GHz for incident angle steered from normal to 45° and for both TE an

ISSN:0895-2477    

DOI:10.1002/mop.4650050203

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

年代:1992

数据来源: WILEY

摘要:

AbstractElectromagnetic coupling between coplanar waveguides (CPW) and microstrip patch antennas has been investigated for two feed configurations: (1) direct aperture‐coupled feeding of a patch antenna by a CPW feed, and (2) proximity‐coupled feeding of a patch antenna by a microstrip line which is aperture coupled to a CPW feed. Results indicate that both feeding approaches are feasible and yield high coupling efficie

ISSN:0895-2477    

DOI:10.1002/mop.4650050204

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

年代:1992

数据来源: WILEY

摘要:

AbstractIn 1979 Riblet gave an excellent treatment of this rectangular line with an off‐center strip inner conductor [1]; however this work may not be very useful to those not very familiar with elliptical integrals. Here we will try to reformulate Riblet's results with some comment

ISSN:0895-2477    

DOI:10.1002/mop.4650050205

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

年代:1992

数据来源: WILEY

摘要:

AbstractRadiation of an electric dipole located along an arbitrary direction in the presence of a grounded chiral slab is investigated using matrix analysis in conjunction with Fourier‐transform techniques. Numerical results of the radiation pattern of such a structure are plotted both for vertical and parallel case

ISSN:0895-2477    

DOI:10.1002/mop.4650050206

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

年代:1992

数据来源: WILEY

摘要:

AbstractThis article discusses electromagnetic wave propagation in chiral slab waveguides that are characterized by surface impedances of different types. The method applied makes use of the vector circuit theory and the related tangential field requirements on the slab surfaces. The method forms a coherent and solid approach to parallel‐plate waveguide analysis, since all cases considered can be solved from the same general eigenvalue equation. The theory is illustrated by numerical example

ISSN:0895-2477    

DOI:10.1002/mop.4650050207

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

年代:1992

数据来源: WILEY

摘要:

AbstractThe optoelectronic chip implementation of a bipolar quadratic associative memory is reported. A new version of the bipolar quadratic neural network is proposed and an optoelectronic system based on two inner‐product multipliers is used. The quadratic associative memory described in this article has a larger storage capacity and a higher error‐correction capability than those of the unipolar one. Experimental results are also gi

ISSN:0895-2477    

DOI:10.1002/mop.4650050208

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

年代:1992

数据来源: WILEY

摘要:

AbstractDistributed transmission line theory is used to accurately model microstrip ring resonator circuits. The dependence of the resonant modes on the azimuthal position of slits in the ring resonator is clearly demonstrated. The results form the basis for the design of resonators for microwave and optoelectronic applications.

ISSN:0895-2477    

DOI:10.1002/mop.4650050209

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

年代:1992

数据来源: WILEY

摘要:

AbstractReflection dyadic for an incident plane wave reflecting at a planar interface between isotropic and bi‐isotropic (nonreciprocal chiral) half spaces is presented. The result generalizes earlier expressions for Fresnel's formulas for different isotropic and chiral half spaces and is roughly of the same order of complexity as that for the reciprocal chiral half spac

ISSN:0895-2477    

DOI:10.1002/mop.4650050210

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

年代:1992

数据来源: WILEY

摘要:

AbstractUsing diffracted‐field formulas the slope of the field is evaluated at the reflection boundary of an edge‐induced shadow. Retaining high‐frequency terms the wavelength dependency is (λ)−1/2. Using a formula for the field near the turning point of an inflected surface the slope of the field at the reflection boundary is evaluated. Retaining high‐frequency terms, the wavelength dependency is (λ)−5/6in this case. That is, the shadow for the surface‐curvature‐induced case gets sharper nearly twice as fast as for the edge‐induced case as the frequency increases. This slope is a measure of spillover int

ISSN:0895-2477    

DOI:10.1002/mop.4650050211

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

年代:1992

数据来源: WILEY