摘要:

AbstractIn this article the temperature behavior of Schottky and backward diodes operating as square‐law detectors at microwave frequencies is presented. To make a quantitative comparison between both diodes possible, the most important diode parameters are discussed. The criteria for comparison are the voltage sensitivity and the video resistance. © 1992 John Wiley&Sons, I

ISSN:0895-2477    

DOI:10.1002/mop.4650050702

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

年代:1992

数据来源: WILEY

摘要:

AbstractThe performance of a simple antenna, the open‐ended parallel‐plate waveguide, is optimized for pulse radiation by including a section of waveguide with tapered resistive loading. The novelty of the optimization is that the resistive loading is not only used in the traditional sense to reduce internal reflections, but the frequency dispersion inherent in the loading is also used to compensate for the distortion of the pulse on radiation from the open end. The analysis and optimization are performed using the finite‐difference time‐domain (FDTD) technique. The approach introduced here for optimizing this simple radiator should be applicable to more complex, practical antennas. © 1992 John Wiley&S

ISSN:0895-2477    

DOI:10.1002/mop.4650050703

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

年代:1992

数据来源: WILEY

摘要:

AbstractIt is shown how the three complex constitutive parameters of a lossy, homogeneous chiral slab may be obtained from its scattering parameters for illumination by a normally incident, linearly polarized plane wave. The method involves mathematical inversion of the scattering parameters and the result is an explicit, noniterative algorithm which yields the unknown constitutive parameters directly. © 1992 John Wiley&Sons, Inc

ISSN:0895-2477    

DOI:10.1002/mop.4650050704

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

年代:1992

数据来源: WILEY

摘要:

AbstractParameter trade‐off for minimizing high‐speed pulse distortion on a microstrip line is investigated. The sensitivity of physical parameters to conductor loss, dielectric loss, and inflection frequency is first studied and then summarized in a compact and easy‐to‐use format. The results of this work will provide designers with simple and effective guidelines for designing microstrip lines with a reduced output signal distortion © 1992 John Wiley&S

ISSN:0895-2477    

DOI:10.1002/mop.4650050705

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

年代:1992

数据来源: WILEY

摘要:

AbstractA fabrication method of strip‐loaded waveguide on lithium outdiffused lithium niobate substrate is presented. The fabricated waveguide provides good characteristics, such as single transverse magnetic (TM) or electric (TE) polarization and without having a thick surface guide on the substrate. Also it takes less time to fabricate the waveguide, and hence, less damage on the substrate is expected. A numerical simulation shows that the normalized amplitude contours of the fundamental waveguide mode can be expanded for efficient fiber coupling or condensed for enhancing the electro‐optic effect depending on the refractive index of the loaded strip. The output power profile of the waveguide, detected by a linear array of charge coupled devices, is in good agreement with that calculated numerically. © 1992 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650050706

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

年代:1992

数据来源: WILEY

摘要:

AbstractAn electromagnetic theory and mathematical procedure to determine the permittivity and permeability of lossless microwave resonators using two resonant modes is presented. An illustrative example is given for a resonator with a relative permittivity of 10 and a relative permeability of 3. © 1992 John Wiley&Sons, Inc

ISSN:0895-2477    

DOI:10.1002/mop.4650050707

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

年代:1992

数据来源: WILEY

摘要:

AbstractA spectral domain analysis of the rectangular microstrip antenna with an air gap is presented. Numerical results are given on input impedance, resonant frequency, and radiation patterns. It is found that, as the air gap width increases, both the resonant frequency and the impedance bandwidth increase, accompanied by a decrease in beamwidth. © 1992 John Wiley&Sons, Inc

ISSN:0895-2477    

DOI:10.1002/mop.4650050708

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

年代:1992

数据来源: WILEY

摘要:

AbstractA simple and reliable procedure is described for finding the complete spectrum of modes that may be excited in a parallel‐plate waveguide filled with a two‐layer uniaxial medium. © 1992 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650050709

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

年代:1992

数据来源: WILEY

摘要:

AbstractThe associative memory of the two‐dimensional (2‐D) Hopfield model described in terms of inner product is realized by using a multiimaging hybrid system and an incoherent correlation hybrid system, respectively. A new method, in which polarization coding and half wave plate are employed, is proposed to encode the bipolar data in memory masks. Four 8 × 8 images are used in our experiment, and the experimental results agree well with the numerical simulations. On the basis of this, we also present the inner‐product expression of the modified Hopfield model for the heteroassociative memory which can be implemented in the same system described for autoassociation, as long as the first memory mask is changed and the thresholds in the feedback are adjusted accordingly. © 1992 John Wiley&So

ISSN:0895-2477    

DOI:10.1002/mop.4650050710

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

年代:1992

数据来源: WILEY

摘要:

AbstractIn this article the scale factor of RCS for lossy targets is given, by which the RCS of a complex lossy target can be calculated in terms of scale‐model testing, even though the model does not satisfy similarity becausse of coated absorbent materials. © 1992 John Wiley&Sons, I

ISSN:0895-2477    

DOI:10.1002/mop.4650050711

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

年代:1992

数据来源: WILEY