摘要:

AbstractThe design, fabrication, testing, and analysis of a new broadband rectangular microstrip antenna element resonating at 7.200 GHz is introduced and discussed. Measured data on the performance characteristics of the new antenna element are presented and compared with the characteristics of a conventional microstrip antenna element having the same dimensions. © 1994 John Wiley&Sons, Inc

ISSN:0895-2477    

DOI:10.1002/mop.4650071502

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

年代:1994

数据来源: WILEY

摘要:

AbstractThe analytical expression for the fractional power dissipated by a microwave circuit is derived in terms of the scattering parameters. Consideration is given to both complex and real port reference impedances. Theoretical values of fractional dissipated power, computed using a full‐wave analysis technique, are compared to experimentally obtained data. © 1994 John Wiley&Sons, I

ISSN:0895-2477    

DOI:10.1002/mop.4650071503

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

年代:1994

数据来源: WILEY

摘要:

AbstractIn the past, several extrapolation techniques have been used in conjunction with the finite‐difference—time‐domain algorithm to reduce the computational cost involved in obtaining an accurate representation of the frequency response of the electromagnetic system under consideration. In this article we study the performances of different autoregressive techniques in accurately estimating the spectra of finite‐difference—time‐domain waveforms without resorting to extrapolation. The advantages and disadvantages of these techniques are demonstrated through two examples: a package plane structure and a cavity. © 1994 John Wil

ISSN:0895-2477    

DOI:10.1002/mop.4650071504

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

年代:1994

数据来源: WILEY

摘要:

AbstractIn this article we present a new design method for monolithic trans‐impedance receivers that is based on a simple model of voltage amplifier and on root‐locus evaluation of closed‐loop transimpedance transfer function. © 1994 John Wiley&Son

ISSN:0895-2477    

DOI:10.1002/mop.4650071505

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

年代:1994

数据来源: WILEY

摘要:

AbstractSlot narrow‐wall couplers are simple but effective directional couplers. A simple and efficient approach to analyze these devices using the FDTD algorithm is presented. The technique uses a synthetic excitation and a second‐order ABC especially designed for the frequencies contained in the incident field. The method is illustrated in the computation of coupling and isolation of a two‐slot ‐20‐dB coupler and is also applied to study a three‐slot coupler. © 1994 John Wil

ISSN:0895-2477    

DOI:10.1002/mop.4650071506

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

年代:1994

数据来源: WILEY

摘要:

AbstractA broadband cylindrical‐rectangular microstrip antenna using two parasitic patches gap coupled to its radiating edges is studied by using a full‐wave analysis and a Galerkin's moment‐method calculation. Results indicate that, with parasitic patches, an antenna bandwidth greater than two times that of a single cylindrical‐rectangular patch antenna can be obtained. Details of the numerical results for different curvature radii and gap spacings are presented. © 1994 John Wiley&S

ISSN:0895-2477    

DOI:10.1002/mop.4650071507

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

年代:1994

数据来源: WILEY

摘要:

AbstractIn this article shortcomings of the Fresnel knife‐edge theory are discussed and simple analytical correction factors are obtained with the help of UTD single‐wedge results. This new formulation is especially helpful in radio links where great diffraction effects are a concern. © 1994 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650071508

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

年代:1994

数据来源: WILEY

摘要:

AbstractA new antenna model and a new formula for calculating the resonant frequency of an electrically thick rectangular microstrip patch antenna are presented. The model is based on the use of the Schwarz‐Chritoffel transformation and on a dielectric‐loaded inhomogeneous rectangular cavity. The resonant frequency of the dominant mode is obtained by using a variational method. © 1994 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650071509

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

年代:1994

数据来源: WILEY

摘要:

AbstractThis article presents a broadband quadrature coupler realized using a novel braided microstrip structure that consists of 64 air‐bridge crossovers. The test results of the 2.5–8‐GHz single‐section coupler fabricated on a 125‐μm‐thick GaAs substrate are presented. This coupler achieved better than 17‐dB return loss, 11 dB of isolation and ±0.75 of amplitude variation over the almost 2‐octave bandwidth. This bandwidth and performance are the best reported for a braided microstrip coupler. © 1994 Jo

ISSN:0895-2477    

DOI:10.1002/mop.4650071510

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

年代:1994

数据来源: WILEY

摘要:

AbstractA three‐dimensional SOFT (self‐organizing finite‐element tessellation) mesh generator, based on self‐organizing topology‐preserving feature maps, is developed for electromagnetic field problems. A user‐supplied probability function controls the density of the graded mesh, and local mesh refinements are easily incorporated. © 1994 John Wil

ISSN:0895-2477    

DOI:10.1002/mop.4650071511

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

年代:1994

数据来源: WILEY