摘要:

AbstractHere, we theoretically analyze the mutual coupling between two finite‐length thin wire chirostrip antennas. These antennas are defined as thin wires printed on grounded substrate made of chiral materials which exhibit electromagnetic handedness. Chiral materials are circular polarization (CP) birefringent and are described by the constitutive relations ε and ε with εcμc, and ε as material parameters. Mutual coupling for broadside, collinear, and echelon configurations for these antennas is investigated, and it is shown that introducing chirality in the substrate can, under certain circumstances, modify the mutual coupling between the chirostrip antennas. © 1993 John Wiley&So

ISSN:0895-2477    

DOI:10.1002/mop.4650061202

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

年代:1993

数据来源: WILEY

摘要:

AbstractPropagation of nonsoliton and soliton signals in long‐haul fiber links is numerically investigated in the presence of chromatic dispersion, the Kerr effect, and noise of erbium amplifiers. Conditions for propagation of a nonsoliton signal with good system performances are found when an anomalous dispersion region is used. A comparison with systems based on such signals and soliton systems are also presented. © 1993 John Wiley&Sons, I

ISSN:0895-2477    

DOI:10.1002/mop.4650061203

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

年代:1993

数据来源: WILEY

摘要:

AbstractThe design of a multichannel millimeter‐wave total power radiometer with frequent calibration is described. The radiometer has seven channels ranging in frequency from 20 to 183 GHz. The radiometer combines a quasioptical front end with subharmonic mixers and integrated calibration loads to yield a compact low‐cost radiometer package. Measured results are presented. © 1993 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650061204

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

年代:1993

数据来源: WILEY

摘要:

AbstractComposites consisting of randomly dispersed, electrically small, uniaxial inclusions in an isotropic dielectric‐magnetic host material are homogenized in accordance with the Maxwell‐Garnett approach. The inclusions may be wire‐and‐loop models of helices or acicular bianisotropic bodies. Effective constitutive dyadics for the composites are found for various orientational arrangements of the inclusion objects. Furthermore, the inadequacy of current theoretical models for scattering from electrically small metal helices is discussed. © 1993 John Wiley&S

ISSN:0895-2477    

DOI:10.1002/mop.4650061205

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

年代:1993

数据来源: WILEY

摘要:

AbstractWe analyze the coupled‐mode propagation in planar gyrotropic chirowaveguides. At first, the transverse components of electric and magnetic fields in such waveguides are expressed in terms of the longitudinal components of Ē and H̄. Dispersion diagrams for the parallel metallic‐plate gyrotropic chirowaveguides are shown, and their novel features are pointed out. The effects of chirality admittances on the cutoff wavelengths of propagating modes in the grounded planar and parallel metallic‐plate gyrotropic chirowaveguides are taken into consideration. © 1993 John Wiley&S

ISSN:0895-2477    

DOI:10.1002/mop.4650061206

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

年代:1993

数据来源: WILEY

摘要:

AbstractThe results of a theoretical study of the effects of the strain on the cutoff frequencies of SiGe HBTs are presented. The influence of the strain on the base resistance and transit time, and through them on high‐frequency performance, was taken into account. The positive role played by the strain is demonstrated. © 1993 John Wiley&Sons, I

ISSN:0895-2477    

DOI:10.1002/mop.4650061207

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

年代:1993

数据来源: WILEY

摘要:

AbstractThe performance of a moment‐method code on a parallel computer is analyzed and evaluated. Algorithmic complexity costs are discussed in terms of matrix size and a parameter of matrix partitioning, subblock size. The measured computational times of the matrix fill operation and LU solver are analyzed in terms of scaled efficiencies. © 1993 John Wiley&Sons, I

ISSN:0895-2477    

DOI:10.1002/mop.4650061208

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

年代:1993

数据来源: WILEY

摘要:

AbstractThe radiation behavior of a microstrip traveling‐wave antenna is theoretically analyzed using a time‐domain method based on the FDTD. The time evolution of the fields and currents computed by the FDTD can be given in the frequency domain on a large bandwidth using Fourier transforms. Then it is possible to deduce classical parameters as the radiated field, the gain, and the power delivered by the antenna. © 1993 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650061209

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

年代:1993

数据来源: WILEY

摘要:

AbstractA planar structure backed with a cavity is analyzed by a spectral‐domain‐eigenfunction method. An appropriate basis function and an appropriate weighting function have been chosen, which greatly simplifies the process of the solution. Finally, the calculated radiation fields of the antenna are compared with the measured results. © 1993 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650061210

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

年代:1993

数据来源: WILEY

摘要:

AbstractEigenwaves in novel materials which have properties of chiral composites and omega structures are considered. The materials can be modeled by uniaxial bianisotropic constitutive relations. Both chiral and omega composites possess promising features, for and one may expect still more interesting effects in more general media. © 1993 John Wiley&Sons, Inc

ISSN:0895-2477    

DOI:10.1002/mop.4650061211

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

年代:1993

数据来源: WILEY