摘要:

AbstractIn this Letter, we propose to show the existence of quasicomplex modes of boxed coplanar lines laid on a lossy dielectric substrate for millimeter‐wave applications, using the method of lines with non‐equidistant discretization. These quasicomplex modes are defined by studying the behavior of the two complex solutions of the propagation problem of the classical lossless boxed coplanar line versus the losses of dielectric substrate. © 1994 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650071002

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

年代:1994

数据来源: WILEY

摘要:

AbstractA new technique is presented for accelerating the fast multipole method, allowing rapid solution of surface integral equations for wave‐scattering problems. A nonnested, ray‐propagation approach is used to compute a matrix‐vector multiply in O(N4/3) operations, where N is the number of unknowns in the discretized integral equation. © 1994 John Wiley&Son

ISSN:0895-2477    

DOI:10.1002/mop.4650071003

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

年代:1994

数据来源: WILEY

摘要:

AbstractTriplate shielded strip line is an important low‐loss, high‐power transmission line geometry widely used in beam‐former arrays. Accurate design information on higher‐order mode onset frequencies is presented here using finite‐element techniques and an experimental cavity method. Field plots and some design recommendations are included for completeness. © 1994 John Wiley

ISSN:0895-2477    

DOI:10.1002/mop.4650071004

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

年代:1994

数据来源: WILEY

摘要:

AbstractTwo omnidirectional and circularly polarized low‐gain antennas (the crossed drooping dipole and the TM21‐mode circular patch antenna) are developed for direct broadcast satellite radio (DBSR) outdoor mobile terminal applications. Two medium‐gain circularly polarized microstrip patch arrays [one uses the conventional circular polarization (CP) feed and the other uses the sequentially arranged CP feed techniques] are also developed to provide at least 12–dBic peak gain for DBSR indoor fixed terminal applications. The sequentially arranged CP fed array has a better CP performance over a broader bandwidth than the conventionally fed array. All the antennas are small in size/mass and inexpensive in fabrication cost. The patch antennas also have a low profile. © 1994 John Wiley&S

ISSN:0895-2477    

DOI:10.1002/mop.4650071005

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

年代:1994

数据来源: WILEY

摘要:

AbstractThe finite‐element method together with the Green's‐function technique is employed to tackle the scattering problems of bending dielectric waveguides with reflection walls. The influences of the frequency, the ratio of waveguide widths, and the length of the reflection wall on the scattering characteristics of 90° and 120° bends are presented. © 1994 John Wiley&Son

ISSN:0895-2477    

DOI:10.1002/mop.4650071006

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

年代:1994

数据来源: WILEY

摘要:

AbstractThe subject of this article is the analysis of planar stratified structures with a general bianisotropic grounded slab fed by a threedimensional electric point source. The electromagnetic problem is solved in terms of the spectral electric Green's dyad. The elements of the first and third column of the spectral Green's dyad are directly derived from the transmission line equations satisfied by the electromagnetic field in the two‐dimensional Fourier domain. The reaction theorem and the Parseval theorem are then applied to the spectral electromagnetic field, and the elements of the second column of the spectral Green's dyad are provided. Finally, as an application of the theory, we present the expression of the Gyyterm when the bianisotropic grounded slab is a pseudochiral one. © 1994 John Wiley&Sons, I

ISSN:0895-2477    

DOI:10.1002/mop.4650071007

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

年代:1994

数据来源: WILEY

摘要:

AbstractIn this article, under the quasi‐TEM assumption, through an exact electromagnetic field analysis, we give an analytic solution for the current density inside the conductors of a lossy circular two‐wire transmission line, and finally obtain the exact expressions for the ac resistance and internal inductance at an arbitrary frequency. © 1994 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650071008

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

年代:1994

数据来源: WILEY

摘要:

AbstractNumerical results of the absorption cross sections of dielectric cylinder clusters are presented. They show that the absorption of such clusters can be several times larger than the incoherent sum of the absorption of its components. The absorption enhancement of the cluster is due to coherent mutual interaction between its components and can play an important role in remote sensing, particularly in passive remote sensing. © 1994 John Wiley&Sons, Inc

ISSN:0895-2477    

DOI:10.1002/mop.4650071009

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

年代:1994

数据来源: WILEY

摘要:

AbstractThe classical transmission‐line method allows the study of the propagation of a TEM mode along a line. Then, if it is possible to consider nonlocalized losses on a line, the radiation phenomena are not taken into account. In this article, we propose a modification of the transmission‐line method to include radiation phenomena due to discontinuities of impedance or nonrectilinear lines. © 1994 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650071010

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

年代:1994

数据来源: WILEY

摘要:

AbstractWe present an analysis of a slot cut in a broadwall of a rectangular waveguide, coupling into a semiinfinite rectangular waveguide capped by a conducting transverse plate containing the slot. Slots coupling into butt‐ended waveguides are employed in test fixtures in slot array applications. Pertinent integral equations for the slot‐aperture electric field are solved by the method of moments, and scattering characteristics of slot couplers for butt‐ended guides are deduced. Numerical results indicate limitations of these couplers for applications involving reduced‐height guides. © 1994 John Wiley&S

ISSN:0895-2477    

DOI:10.1002/mop.4650071011

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

年代:1994

数据来源: WILEY