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# IEEE Transactions on Antennas and Propagation

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Displaying Results 1 - 21 of 21
• ### Comments on "Millimeter wave propagation in arid land-a field study in Riyadh

Publication Year: 1993
| | PDF (102 KB)

The commenter notes that the paper by A.A. Ali and M.A. Alhaider (see ibid., vol.40, no.5, p.492-9, May 1992), the 0.88 mu m attenuation by rain with rates exceeding 7 mm/h was observed to be about 30% lower than expected from computation. This is of the same order of discrepancy as was observed by T.S. Chu and D.C. Hogg (1968) in measurements at 0.63, 3.5, and 10.6 mu m during heavy rains in New ... View full abstract»

• ### Comments on "A stable procedure to calculate the transient scattering by conducting surfaces of arbitrary shape" [with reply]

Publication Year: 1993, Page(s):517 - 520
Cited by:  Papers (18)  |  Patents (1)
| | PDF (470 KB)

Lengthy comments are offered on some remarks made in the paper by D.A. Vechinski and S.M. Rao (see ibid., vol.40, no.6, p.661-5, June 1992) regarding the solution procedure described by B.P. Rynne (1991). Vechinski and Rao offer arguments in rebuttal.<> View full abstract»

• ### Comments on "Properties of electromagnetic beams generated by ultra-wide bandwidth pulse-driven arrays" [with reply]

Publication Year: 1993, Page(s):520 - 522
Cited by:  Papers (2)
| | PDF (335 KB)

The commenter maintains that there are some errors in the above-titled paper by R.W. Ziolkowski (see ibid., vol.40, no.8, p888-905, Aug. 1992) that may affect some results and the conclusion of the paper. Ziolkowski replies that the commenter's analysis is incorrect and does not reproduce experimentally known results, because of an incorrect model of the receiver corresponding to the matched trans... View full abstract»

• ### Corner effects on the mutual impedance between edge slots

Publication Year: 1993, Page(s):488 - 492
Cited by:  Papers (6)
| | PDF (424 KB)

An analysis for calculating the mutual impedance between two edge slots in a linear slotted waveguide array is presented. The analysis uses a 90° wedge Green's function to account for the influence of the waveguide corners on the evaluation of the external mutual coupling. A novel asymptotic formula for the 90° wedge Green function's is derived to expedite the numerical analysis for slots ... View full abstract»

• ### Diffraction analysis of frequency selective reflector antennas

Publication Year: 1993, Page(s):476 - 487
Cited by:  Papers (32)
| | PDF (812 KB)

A unified computational technique which allows the incorporation of the curved frequency selective surface (FSS) geometry in the computation of a dual-reflector-antenna radiation pattern is presented. The scattered fields from a illuminated FSS reflector are formalized using Huygens' principle in such a way that the reflecting' and the transparent' FSS subreflector cases are treated identically ... View full abstract»

• ### Scattering from thin dielectric straps surrounding a perfectly conducting structure

Publication Year: 1993, Page(s):442 - 447
| | PDF (452 KB)

Dielectric straps can support very heavy targets and have low backscattering levels, especially at low frequencies (below 8 GHz); thus, they can be used effectively to support targets during backscattered field measurements. The scattered fields of nonmagnetic dielectric straps surrounding a perfectly conducting structure are presented, and the computed results are compared with experimental data.... View full abstract»

• ### Monte Carlo simulation of scattering from a layer of vertical cylinders

Publication Year: 1993, Page(s):465 - 475
Cited by:  Papers (29)
| | PDF (768 KB)

Electromagnetic scattering by a collection of randomly distributed vertical cylinders over a half-space dielectric is considered, using two approaches. In the first approach, a Monte Carlo simulation that takes into account scattering terms up to second order is used. Closed-form expressions for the second-order scattering terms are derived for cylinders that are in each other's near field. The se... View full abstract»

• ### Statistical moments of radar cross section

Publication Year: 1993, Page(s):506 - 508
Cited by:  Papers (1)
| | PDF (228 KB)

The radar cross section (RCS) for backscatter from a smooth closed convex surface reflector, as calculated from geometrical optics, is shown to have a mean value equal to A/4, where A is the total surface area of the reflector, and the mean is obtained by averaging over all aspects. Results are also given for the calculation of higher-order moments and probability density functio... View full abstract»

• ### Numerical diffraction coefficients for surface waves

Publication Year: 1993, Page(s):458 - 464
Cited by:  Papers (4)
| | PDF (616 KB)

The numerical uniform theory of diffraction (UTD) is extended to include surface waves. A method for extracting surface wave diffraction coefficients from moment method data is given and Prony's method is applied to the problem of determining surface wave propagation constants. The method is validated through comparison with the exact solution of the problem of surface wave diffraction by a trunca... View full abstract»

• ### Two near-to far-zone approaches for scattering problems using the TLM method

Publication Year: 1993, Page(s):502 - 505
Cited by:  Papers (9)
| | PDF (312 KB)

The far-scattered field and radar cross section (RCS) are calculated by transforming the results of the transmission-line-matrix (TLM) method with the symmetrical condensed node (from the near-to the far-zone) by means of two different approaches, in the time domain. The first approach is based on the electromagnetic equivalence principle, and the second is based on the Kirchhoff theory of integra... View full abstract»

• ### A comparison of two radio propagation channel impulse response determination techniques

Publication Year: 1993, Page(s):515 - 517
Cited by:  Papers (18)
| | PDF (252 KB)

A comparison of two radio propagation channel impulse response determination techniques is described. Presented are typical impulse response and transfer functions obtained from each measurement system. Also included for comparison are average impulse response envelopes and cumulative probability distributions for the RMS delay spread of static indoor radio channels calculated from 120 measurement... View full abstract»

• ### A physical basis formulation for the electromagnetic backscattering by a finite-length rectangular trough in a ground plane

Publication Year: 1993, Page(s):397 - 402
Cited by:  Papers (2)
| | PDF (432 KB)

The electromagnetic backscattering from a finite-length rectangular trough in an infinite ground plane is examined. A physical basis formulation is used to express the unknown currents in the trough aperture in terms of a forced wave resulting from the incident plane wave, and one or more pairs of oppositely directed traveling waves propagating along the trough. A Galerkin solution is employed to ... View full abstract»

• ### An array feed approach to compact range reflector design

Publication Year: 1993, Page(s):448 - 457
Cited by:  Papers (4)  |  Patents (4)
| | PDF (728 KB)

A novel methodology is presented for the design of array feeds for compact range reflectors. The principal design strategy is to illuminate the rim of a standard, circular-aperture reflector with an array pattern null. This results in a reduction in the level of edge-diffracted fields present in the quiet zone. Since low-frequency performance is improved without dedicating reflector surface area t... View full abstract»

• ### Surface roughness determination using spectral correlations of scattered intensities and an artificial neural network technique

Publication Year: 1993, Page(s):498 - 502
Cited by:  Papers (10)
| | PDF (380 KB)

An artificial neural network (ANN) technique is applied to the determination of the RMS height and the correlation distance of one-dimensional rough surfaces. The surface is illuminated by a beam wave, and the intensity correlations of the scattered wave at two wavelengths in the specular and backward directions are used to determine the roughness parameters. Scattered intensity correlations calcu... View full abstract»

• ### Far-field transforms for finite element frequency-domain solutions

Publication Year: 1993, Page(s):511 - 514
Cited by:  Papers (2)
| | PDF (272 KB)

Methods of calculating far-field quantities from a two-dimensional finite element/absorbing boundary solution of unbounded RF electromagnetic fields are presented. Three different methods are developed and compared in terms of accuracy, efficiency, and capabilities. The three methods are: harmonic expansion, Green's theorem integral, and volume sources radiation integral View full abstract»

• ### EM plane wave diffraction by a a planar junction of two thin material half-planes-oblique incidence

Publication Year: 1993, Page(s):429 - 441
Cited by:  Papers (15)
| | PDF (992 KB)

A uniform geometrical theory of diffraction (UTD) solution is developed for analyzing the high-frequency diffraction of an obliquely incident plane wave by a two-part, thin, planar, transparent material slab. The solution is obtained by appropriately combining two solutions for the two related configurations involving perfectly conducting electric and magnetic ground plane bisections of the origin... View full abstract»

• ### Rain side-scatter interference in the satellite links of the 1990s

Publication Year: 1993, Page(s):493 - 498
Cited by:  Papers (4)
| | PDF (532 KB)

In addition to inducing attenuation and depolarization in satellite links, scattering by rain can create intersystem interference. This type of interference was investigated extensively in the 1970s for terrestrial paths, but little has been done to study its effects on modern and future satellite links. Studies of the potential interference created by the scattering of an uplink signal into an ad... View full abstract»

• ### Sufficient conditions for alias-free direction of arrival estimation in periodic spatial spectra

Publication Year: 1993, Page(s):508 - 511
Cited by:  Papers (9)  |  Patents (1)
| | PDF (320 KB)

The problem of broadband spatial spectral estimation with a uniform linear array where the interelement spacing is greater than a half-wavelength over the frequency band of interest is addressed. It is shown that by using properly chosen frequencies, ambiguities in the source location estimates can be resolved. The proposed approach is based on the selection of the wavelengths to ensure that alias... View full abstract»

• ### A new approach to the optimization of robust antenna array processors

Publication Year: 1993, Page(s):403 - 411
Cited by:  Papers (13)
| | PDF (576 KB)

The authors present a method for solving a class of optimization problems with nonsmooth constraints. In particular, they apply the method to the design of narrowband minimum-power antenna array processors which are robust in the presence of errors such as array element placement, look direction misalignment, and frequency offset. They first show that the constrained minimum power problem has a un... View full abstract»

• ### Time harmonic and transient scattering by finite periodic flat strip arrays: hybrid (ray)-(Floquet mode)-(MOM) algorithm

Publication Year: 1993, Page(s):412 - 421
Cited by:  Papers (72)
| | PDF (796 KB)

A frequency and short-pulse (SP) time-domain (TD) study of two-dimensional plane wave scattering from a finite periodic array of thin, flat, coplanar perfectly conducting strips is presented. Rigorous analytical-numerical reference solutions are established by spatial spectral wave number decomposition and the method of moments (MOM), followed by frequency inversion. The analytical portion is appr... View full abstract»

• ### Admittance of an isolated waveguide-fed slot radiating between baffles using a spectrum of two-dimensional solutions

Publication Year: 1993, Page(s):422 - 428
Cited by:  Papers (31)  |  Patents (1)
| | PDF (524 KB)

An efficient method of computing resonant length and admittance characteristics of an isolated broad-wall shunt slot radiating between baffles of finite height is presented. The outer three-dimensional (3D) field problem associated with this geometry is reduced to a two-dimensional (2D) one via a Fourier transformation with respect to the longitudinal z direction. For each value of the lo... View full abstract»

## Aims & Scope

IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas.

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## Meet Our Editors

Editor-in-Chief                                             Danilo Erricolo