摘要:

AbstractEfficient diplexing of bands centered at 200 and 600 GHz has been achieved using two types of frequency selective surfaces. Computer and measured results are used to assess their suitability as beam splitters in a submillimeter‐wave quasioptical radiometer. © 1994 John Wiley&Sons, I

ISSN:0895-2477    

DOI:10.1002/mop.4650071302

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

年代:1994

数据来源: WILEY

摘要:

AbstractNew reflective optical fiber star couplers are proposed. The star broadcasts to all receiwers without excess loss by rotating the polarization of the transmitted light by 90°. The couplers use an orthogonal‐polarization variable reflector that can act as either a full or half reflector. Published by John Wiley&Sons, Inc. © 1994 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650071303

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

年代:1994

数据来源: WILEY

摘要:

AbstractA modified set of Maxwell's equations is presented that includes complex coordinate stretching along the three Cartesian coordinates. The added degrees of freedom in the modified Maxwell's equations allow the specification of absorbing boundaries with zero reflection at all angles of incidence and all frequencies. The modified equations are also related to the perfectly matched layer that was presented recently for 2D wave propagation. Absorbing‐material boundary conditions are of particular interest for finite‐difference time‐domain (FDTD) computations on a single‐instruction multiple‐data (SIMD) massively parallel supercomputer. A 3D FDTD algorithm has been developed on a connection machine CM‐5 based on the modified Maxwell's equations and simulation results are presented to validate the approach. © 1994 John Wil

ISSN:0895-2477    

DOI:10.1002/mop.4650071304

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

年代:1994

数据来源: WILEY

摘要:

AbstractA simple technique to improve the impedance bandwidth of a circular microstrip patch antenna using two sectoral slots is proposed. Using this design more than 5% impedance bandwidth is obtained. The added advantage of this new antenna is that it can be fed by a 50‐ω microstrip line. © 1994 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650071305

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

年代:1994

数据来源: WILEY

摘要:

AbstractThe effect of row withdrawal in surface acoustic wave reflective dot array dispersive delay lines has been investigated, and the simulated multifrequency, constant fractional chirp bandwidth operation of such a device has been experimentally validated. Utilizing appropriate input/output interdigital transducers, the approach enables higher frequency and increased time‐bandwidth product operation of reflective array devices, with relaxed mask‐making and lithography constraints. © 1994 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650071306

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

年代:1994

数据来源: WILEY

摘要:

AbstractA new three‐dimensional time‐domain method is proposed. The computational domain consists of a union of tetrahedrons with electric fields assigned on the edges. Fields are updated from the integral form of Maxwell's equations in conjunction with the use of Whitney two‐form elements. A rectangular waveguide is modeled as an example. © 1994 John Wiley&Son

ISSN:0895-2477    

DOI:10.1002/mop.4650071307

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

年代:1994

数据来源: WILEY

摘要:

AbstractAn original analysis and results are presented for the sensitivity and self‐timing of a hybrid p‐i‐n, heterojunction bipolar transistor pulse position modulation (p‐i‐n‐HBT PPM) strategy at 622 Mbit/s and λ = 0.85 μm. The results indicate a significant performance improvement over a comparable p‐i‐n‐HBT PCM system. The proposed strategy can find application in optical signal distribution at high bit rates in areas such as optical back planes and multiprocessor systems. The self‐timing of the hybrid is addressed and original results are presented for the extracted slot clock timing variance and the associated jitter wrong slot error (WSE) probability, resulting in specifications on the optimum PPM order, fiber bandwidth, and phase‐lock loop (PLL) bandwidth under self‐timing. ©

ISSN:0895-2477    

DOI:10.1002/mop.4650071308

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

年代:1994

数据来源: WILEY

摘要:

AbstractWe present the design and output characteristics of a periodic Butterworth‐like blocking filter using the transmitted output intensity of an S‐shaped optical fiber ring resonator with two 2 × 2 fiber couplers. Performance parameters of the periodic Buttenworth‐like blocking filter, including the ripple, the contrast, the bandwidth, and the maximum output intensity, are evaluated, and the design procedures are given. © 1994 John Wiley&So

ISSN:0895-2477    

DOI:10.1002/mop.4650071309

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

年代:1994

数据来源: WILEY

摘要:

AbstractThe cross‐polarization characteristics of a probe‐fed spherical annularring microstrip antenna excited in the TM12mode are investigated. The analysis is performed by using a Green's‐function formulation and a Galerkin's moment‐method calculation. Numerical results of the copolarized and cross‐polarized radiated fields for various sphere radii are calculated and presented. The cross‐polarization level for different feed locations is also discussed. A great dependence of the feed location on the cross‐polarization level is observed. © 1994 John W

ISSN:0895-2477    

DOI:10.1002/mop.4650071310

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

年代:1994

数据来源: WILEY

摘要:

AbstractA novel approach for designing a uniplanar microstrip to slot‐line transition for MIC/MMIC and antenna applications is described. A slot‐line radial stub is utilized to create resonance conditions at the junction of the two transmission lines so that maximum intermodal power transfer occurs. Excellent insertion loss and impedance match is obtained over a 30% bandwidth. © 1994 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650071311

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

年代:1994

数据来源: WILEY