Search

Presents a hybrid technique based on combining ray tracing and finite-difference time-domain (FDTD) methods for site-specific modeling of indoor radio wave propagation. Combination of ray-tracing and FDTD methods; Numerical results; Effect of ray resolution; Conclusion.

Describes a multilevel tabulated interaction method (TIM) for application to the analysis of exceptionally large two-dimensional ultrahigh frequency (UHF) terrain propagation problems. Workings of the standard TIM; Description of a multilevel implementation suitable for usage in the analysis of extremely large scale problems; Numerical examples illustrating the advantages of the method.

Presents information on a study which proposed a ray-tracing method using a ray tube tree for a microcellular wave propagation prediction model. Types of ray tubes; Theory and formulation; Validation of the proposed ray-tracing method; Conclusions.

Focuses on a study which presented a concept of in single-port adaptive antennas using parasitic elements with switched terminating impedances including results from a concept prototype. Overview of the concept of switched parasitic prototype; Patterns of measured antennas; Simulations of the study.

Investigates the diffraction of electromagnetic waves from a surface impedance discontinuity in propagation channel characterization. Use of dipole excitation as the wave source; Formulation of an integral equation for an impedance surface; Comparison of scattering results to geometrical theory of diffraction results.

Presents information on the study which examines the propagation of ultrahigh frequency (UHF) radio wave in tunnels by both theoretical model and measurements. Methodology of the study; Results; Conclusions.

Presents information on the study which examines the radio-wave propagation characteristics of tunnels by the uniform geometrical theory of diffraction (UTD). Methodology of the study; Numerical results; Conclusions.

Presents a study which investigates the propagation of radiowaves that are excited from a dipole antenna and inside a four-layered forest medium. Methodology; Results; Conclusions.

Presents a study which focuses on the propagation of radiowaves over irregular terrain using the split-step Fourier algorithm. Theoretical analysis of the study; Numerical results; Conclusions.

Focuses on a comprehensive system model for characterizing the effects of multipath propagation on digital radio systems in the 4 to 6 Gigahertz band. Development of a two-ray channel model for line-of-sight microwave radio; Development of a multipath model to predict multipath parameters from the link geometry; Inversion of the channel model to recover the two-ray parameters from signal measurements; Review of techniques and results.

Proposes a theoretical model to compute the path loss in a vegetated residential environment, with particular application to mobile radio systems. Effects of trees on the propagation loss; Physical properties of the trees that are significant in computing their propagation constant.

Introduces a method for estimating the density of the propagation loss due to human body shadowing. Details on the body-shadowing model; How to combine the model with ray-determination methods; Description of model parameter selection based on several experimental results; Application of the body-shadowing model to a simple office lay-out; Prediction results at 900 megahertz and 60 gigahertz.

Describes a scheme for the computation of ultrahigh frequency radial propagation loss over irregular terrain. Comparison of the method used with integral-equation solution techniques; Incorporation of the Green's function perturbation method; Computational issues addressed; Application of the method.

Describes the development of a vertical-plane-launch (VPL) technique for approximating a full three-dimensional (3-D) site-specific ray trace to predict radio wave propagation effects in cities. Comparison of the predictions of the VPL technique with measurements for Rosslyn, Virginia; Improvement showed by the VPL method.

Analyzes a channel for the ultrahigh frequency (UHF) wave propagation in the city street. Methods used for the modeling of the city street; Classification of ray field; Presentation of the algorithms for the average intensity as a sum of coherent and noncoherent parts; Numerical evaluation of the algorithms and comparison with the experimental data.

Presents a discussion concerning the need for three-dimensional (3-D) urban radiowave propagation models. Summary of the asymptotic path-integral technique and its previous applications; Limitations and advantages of the asymptotic path-integral technique; Discussion of the results.

Presents the wide-band propagation model based on uniform geometrical theory of diffraction (UTD) for cellular mobile radio communications. Value of wide-band path loss; Characteristics of wideband radiowave propagation model; Conclusion.

Describes a procedure suitable for the prediction of propagation impairments along earth-satellite paths. Propagation factors considered for inclusion in the overall prediction procedure; Method for the prediction of absorption due to atmospheric gases; Procedure for the prediction of tropospheric scintillation.

Compares predictions of a numerical model for site specific very high frequency propagation over irregular terrain to experimental data and to other propagation models. Geometry of propagation problem; Wedge geometry; Predicted one-way propagation factor for perfectly conducting wedge; Parallel implementation; Comparison of MOM predictions with measurement data.

Presents a fourth-order in time and space, finite-difference time-domain (FDTD) scheme for radio-wave propagation in a lossless cold plasma. Methodology used for describing the electromagnetic wave propagation; Numerical verification; Conclusion.

Characterizes the accuracy of the quasi-crystalline approximation and other associated methods of determining effective propagation for two-dimensional random media. Methodology; Analysis of the behavior of the effective permitivity for a range of particle sizes, volume fractions and dielectric losses.

The IEEE Antennas and Propagation Edward E. Altschuler AP-S Magazine Prize Paper Award was established in 2010 to recognize the best contribution published in theIEEE Antennas and Propagation Magazineduring the previous year. [ABSTRACT FROM AUTHOR]

A two-element time-modulated array system is configured to operate as a direction finding antenna. The signal from each element of the array is time switched to provide a phase modulated output in which the depth of modulation is dependent on the angle of arrival of the received signal. Details of an experimental system designed to operate at 2400 MHz are presented and the results are compared to theoretical predictions. [ABSTRACT FROM AUTHOR]

Compared to narrowband antennas, ultrawideband (UWB) antennas have particular characteristics which involve new ways to model them. This paper introduces the use of parametric modeling to efficiently model transfer functions (and associated impulse responses) of UWB antennas, and to determine an equivalent circuit of their input impedance. [ABSTRACT FROM AUTHOR]

Radio coverage and interference in communications systems can be provided by various propagation mechanisms depending on the frequency of the radiowaves and the propagation environment. Key propagation mechanisms include line-of-sight (LOS), diffraction, transmission (or penetration), incoherent scattering, and specular reflections. Knowledge of which propagation mechanisms dominate for coverage and interference calculations is important for cell planning issues. In this communication, we present a novel surface model unifying scatter and Fresnel models and use it to evaluate the relative importance of the different propagation mechanisms in an urban scenario at three frequencies of interest through simulation using an accurate database. The results obtained show that a significant coverage fraction may be provided by reflected paths at low frequencies. At higher frequencies incoherent scattering becomes an increasingly important mechanism and may significantly affect interference predictions. [ABSTRACT FROM AUTHOR]

The far-field physical optics scattering integral for scatter from a surface element S is an area integral evaluated over S. This integral can be reduced to a contour integral evaluated around the boundary edge of S when the Gaussian curvature of S is everywhere equal to zero. Such surface elements include regions on planes, cylinders, cones, and, more generally, any type of developable surface. [ABSTRACT FROM AUTHOR]

Presents a comparison between the ray-tracing approach and empirical models in radio wave propagation path loss. Uses of empirical propagation models; Parameters for the geometry of an urban environment; Observations on the path-loss prediction of radio wave propagation.

Presents a study which analyzed ground wave propagation characteristics using a two-dimensional finite-difference time-domain algorithm. Description of a novel time-domain wave propagator; Wave propagation through a surface duct; Conclusion.

Focuses on a study which assessed cross-floor signal propagation characteristics from measured data toward maximizing electromagnetic compatibility. Methods of the study; Results and discussion.

Comments on the article `Constrained Hung-Turner Adaptive Beamforming Algorithm with Additional Robustness to Wide-Band and Moving Jammers.' How theoretically and by simulation that Hung-Turner projections adequately suppress wide-band jammers; Presentation of the sensor array processing model and assumptions used.

Presents the table of contents for this issue of this publication. [ABSTRACT FROM AUTHOR]

Presents the institutional listings associated with this issue of the publication. [ABSTRACT FROM AUTHOR]

The Harold A. Wheeler Applications Prize Paper Award is presented to the authors of the best applications paper published in the IEEE Transactions on Antennas and Propagation during the previous year. [ABSTRACT FROM AUTHOR]

The following is a list of 2018 IEEE Fellows who are members of the Antennas and Propagation Society. Those with an asterisk after their names were evaluated by the Fellow Committee from societies other than AP-S. [ABSTRACT FROM AUTHOR]

The Lot Shafai Mid-Career Distinguished Achievement Award was established in 2013 to recognize the past technical accomplishments and future potential of an outstanding woman of mid-career status in the field of antennas and propagation. [ABSTRACT FROM AUTHOR]

Advertisements. [ABSTRACT FROM PUBLISHER]

The article presents the list of administrative committee for IEEE Antennas and Propagation Society which includes C. Caloz, J. J. Simpson and G. Lombardi.

The article presents the list of 2016 IEEE Fellows who are members of the Antennas and Propagation Society.

There are a few corrections for [1] that are presented here. Some readers noticed the coordinate of the source in [1, Fig. 1] should be described using the superscript, therefore, we would like correct Fig. 1 as shown. [ABSTRACT FROM PUBLISHER]

The APS Society invites application for Institutional Listings from firms interested. [ABSTRACT FROM PUBLISHER]

This section encourages the submission of proposals for special issues emphasizing research topics on antennas and propagation.

These instructions give guidelines for preparing papers for this publication. Presents information for authors publishing in this journal. [ABSTRACT FROM PUBLISHER]

The article announces that the 2006 Chen-To Tai Distinguished Educator Award by the Institute of Electrical and Electronics Engineers Antennas and Propagation Society has been awarded to Hisamatsu Nakano. He has been chosen as the best instructor in the field of electronic antennas and radio wave propagation. Furthermore, his main research deals with the development and application of computational and design techniques to wideband antennas.

Provides a listing of the editors, board members, and current staff for this issue of the publication. [ABSTRACT FROM PUBLISHER]

These instructions give guidelines for preparing papers for this publication. Presents information for authors publishing in this journal. [ABSTRACT FROM PUBLISHER]

The APS Society invites application for Institutional Listings from firms interested. [ABSTRACT FROM PUBLISHER]

Prospective authors are requested to submit new, unpublished manuscripts for inclusion in the upcoming event described in this call for papers. [ABSTRACT FROM PUBLISHER]