IEEE Transactions on Antennas and Propagation

Issue 3 • May 1972

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Displaying Results 1 - 25 of 32
  • [Front cover and table of contents]

    Publication Year: 1972, Page(s): 0
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    Freely Available from IEEE
  • Pulse excitation of a travelling wave array

    Publication Year: 1972, Page(s):239 - 244
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (503 KB)

    High-resolution radar becomes limited by the feeding mechanism in traveling wave antennas, forcing the design to some form of corporate feed. A spectral method of solving this problem is introduced which conveniently handles any transmitter pulse shape or receiver bandpass. The equivalence between this approach and an older transient solution is established. The method is applied to a uniform and ... View full abstract»

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  • Directivity characteristics of scannable planar arrays

    Publication Year: 1972, Page(s):245 - 252
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (602 KB)

    An exactly integrated expression for directivity is used to obtain curves of directivity versus interelement spacing and scan angle for uniformly excited planar arrays composed of discrete identical elements at regular spacings. The expression can be applied to arrays with nonuniform amplitude distributions and with a variety of ideal element factors. Numerical results are given for square lattice... View full abstract»

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  • Spatial sampling and filtering in near-field measurements

    Publication Year: 1972, Page(s):253 - 261
    Cited by:  Papers (90)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (943 KB)

    A sample spacing criterion and a data minimization technique for measurements made over the surface of a plane in the near field of an antenna are presented. The sample spacing is shown to depend on the distance from the antenna to the measurement plane, and on the extent to which evanescent waves can be neglected. The near-field data minimization technique utilizes two-dimensional spatial filteri... View full abstract»

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  • On a class of optimum aperture distributions for pattern shaping

    Publication Year: 1972, Page(s):262 - 268
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (572 KB)

    A class of optimum aperture distributions that gives the best mean-square approximation with weight factor (1 - eta^{2})^alphato any given pattern space factor for an arbitrarily prescribed value of a generalized superdirectivity ratiogamma_{alpha}is derived for allalpha > -1. Foralpha = 0the parametergamma_{alpha}becomes Taylor's superdire... View full abstract»

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  • Dipole antenna in space-time periodic media

    Publication Year: 1972, Page(s):280 - 287
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (561 KB)

    The problem of dipole radiation in sinusoidally spacetime periodic media is studied and solved. The space-time periodicity can be considered as due to a strong pump wave and is expressed as a traveling-wave type change in the dielectric constant or the plasma density (i.e.,epsilon(z,t) = epsilon_{0}epsilon_{r}[1 + epsilon_{1} cos (Kz - Omega t)]andN(z,t) = N_{0}[1 + N_{1} cos (Kz -... View full abstract»

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  • On the quality factor of strip and line source antennas and its relationship to superdirectivity ratio

    Publication Year: 1972, Page(s):318 - 325
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (694 KB)

    Exact formulas are derived for the quality factorQof strip and line source antennas. Contrary to popular opinion, none of them is equal to Taylor's superdirectivity ratiogammaor togamma - 1. But in the case ofE-plane strip sources (the complement of the type of strip source treated by Woodward and Lawson) the value ofQis precisely equal to View full abstract»

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  • Reduction of reradiated field in equatorial plane of parasitic antenna

    Publication Year: 1972, Page(s):376 - 379
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (377 KB)

    A suitable impedance connected at the center of a parasitic dipole or the base of a monopole antenna can reduce to zero the reradiated field in the equatorial plane. The two-term theory provides a simple formula for the determination of the required impedance for dipole elements up to 1.25 wavelengths long or monopoles up to0.625lambda. Examples and tables are given. View full abstract»

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  • Transient radiation field of a circular loop antenna

    Publication Year: 1972, Page(s):380 - 383
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (407 KB)

    For a circular loop antenna excited by a frequency-hand-limited rectangular voltage pulse, the time variation of the electric field at remote points in various directions has been computed. The computations are for a loop of radiusbmade from wire of radiusa, for which the thickness parameterOmega = 2 ln (2pi b/a) = 15. The moment method was used in obtaining the cu... View full abstract»

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  • VLF/ELF input impedance of an arbitrarily oriented loop antenna in a cold collisionless multicomponent magnetoplasma

    Publication Year: 1972, Page(s):394 - 398
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (537 KB)

    A study is made of the input impedanceZof a small strip-loop antenna with arbitrary orientation in a cold collisionless uniform multicomponent magnetoplasma. Assuming a uniform current distribution, an integral expression forZis derived which is valid for arbitrary values of driving frequency, plasma composition and density, loop orientation anglephi_{0}, and stati... View full abstract»

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  • [Back cover]

    Publication Year: 1972, Page(s): c4
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    Freely Available from IEEE
  • Microwave breakdown on a symmetrically excited conical reentry vehicle

    Publication Year: 1972, Page(s):334 - 339
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (568 KB)

    Predictions and measurements of microwave breakdown in air are compared for a conical reentry vehicle model with an overall length of approximately one wavelength. The vehicle is excited by means of a circumferential gap to form an asymmetric dipole with roll-symmetric radiation. Measurements performed in an evacuable chamber show breakdown occurring at either the nose tip or the feed gap, or simu... View full abstract»

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  • On the reflection of light from an inhomogeneous shell

    Publication Year: 1972, Page(s):390 - 392
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    The main contribution to the reflected field from a radially inhomogeneous spherical shell is determined. It is shown that it is much smaller in amplitude than the field reflected by a perfectly conducting sphere coated with the same type of radially inhomogeneous dielectric. View full abstract»

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  • Antenna synthesis and solution of inverse problems by regularization methods

    Publication Year: 1972, Page(s):268 - 274
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (736 KB)

    Antenna pattern synthesis is discussed as an example of "improperly posed" problems. This serves the purpose of introducing a concept that is useful in many other applications: remote sensing, inverse scattering, etc. It also suggests that regulation methods that have been devised to "solve" improperly posed problems can be applied to antenna synthesis and the aforementioned problems. This gives s... View full abstract»

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  • A transform solution for the fields from a current element

    Publication Year: 1972, Page(s):379 - 380
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (208 KB)

    A new but general method of solution applicable to any radiation problem which can be reduced to an inhomogeneous wave equation for an arbitrary source in a given medium is used to solve for the vector potential of an infinitesimal dipole radiating in free space. The solution of this simple problem yields insight into the use of this method for the solution of more complicated problems. View full abstract»

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  • Mutual coupling in phased arrays of randomly spaced antennas

    Publication Year: 1972, Page(s):288 - 295
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (688 KB)

    Mutual coupling effects in phased arrays with randomly located elements are studied. The network formulation of antenna arrays is found to be a convenient and useful approximation. Two main effects of coupling are separately considered. The first is the increase in the sidelobe level. A new solution for the distribution of sidelobe level has been obtained which is applicable even for small arrays.... View full abstract»

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  • Optimum aperture monopulse excitations

    Publication Year: 1972, Page(s):275 - 280
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (568 KB)

    A unified formulation of the optimization of monopulse antenna performance indices for a specified sidelobe envelope function and/or specified nulls of the pattern is presented. The performance indices considered are beam efficiency, gain factor, and angular sensitivity factor of rectangular and circular apertures. The unconstrained optimization of beam efficiency result in an integral equation, t... View full abstract»

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  • Numerical analysis of electromagnetic radiation properties of smooth conducting bodies of arbitrary shape

    Publication Year: 1972, Page(s):383 - 388
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (616 KB)

    A numerical-theoretical technique is described for determining the surface current density distribution and subsequently the near- and far-zone fields of an arbitrarily shaped perfectly conducting body excited by an arbitrary primary source. The arbitrary surface is described by dividing it into a number of connected cells which are mathematically described as quadric surfaces. The "arbitrary body... View full abstract»

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  • The John T. Bolljahn Memorial Award lecture: A bit of personal history

    Publication Year: 1972, Page(s):233 - 238
    Cited by:  Papers (1)
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    Prepares a paper on the highlights of author's contributions to the fields of antennas and propagation for presentation at the joint session of the Professional Group on Antennas and Propagation and US National Committee of International Scientific Radio Union (URSI) View full abstract»

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  • Satellite altimetry using ocean backscatter

    Publication Year: 1972, Page(s):295 - 309
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1416 KB)

    A model for the signal received when satellite altimetry pulses are scattered back by the ocean's surface is postulated and analyzed. The second-order statistics of the complex nonstationary random process appearing at the detector input are graphically and analytically displayed as a function of the sea state. The standard deviation of various altitude estimates derived by subsequent operations o... View full abstract»

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  • A new numerical approach to the calculation of electromagnetic scattering properties of two-dimensional bodies of arbitrary cross section

    Publication Year: 1972, Page(s):310 - 317
    Cited by:  Papers (44)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (792 KB)

    A new method is introduced for formulating the scattering problem in which the scattered fields (and the interior fields in the case of a dielectric scatterer) are represented in an expansion in terms of free-space modal wave functions in cylindrical coordinates, the coefficients of which are the unknowns. The boundary conditions are satisfied using either an analytic continuation procedure, in wh... View full abstract»

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  • Radio wave propagation over a rough variable impedance boundary: Part I--Full-wave analysis

    Publication Year: 1972, Page(s):354 - 362
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (704 KB)

    A full-wave solution is developed for problems of radio wave propagation over rough surfaces characterized by variable impedance and height parameters. The analysis, which is suitable for problems involving both the radiation fields as well as the ground waves, is compared with earlier solutions to these problems. The full-wave solutions which satisfy the exact boundary conditions are shown to be ... View full abstract»

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  • Linear array and feed network performance in a reentry plasma environment

    Publication Year: 1972, Page(s):340 - 346
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (680 KB)

    The performance of a linear array of rectangular slots in a ground plane, covered with an inhomogeneous dielectric or plasma layer, is analyzed. The self and mutual admittances of the slots and the element radiation pattern are formulated for a given array configuration and external environment. The characteristics of the array are then determined for different types of feed networks. Traveling wa... View full abstract»

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  • Effect of dielectric jacket on a buried travelling-wave antenna

    Publication Year: 1972, Page(s):375 - 376
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (256 KB)

    Transmission line theory has long been used to analyze the performance of dielectric-coated buried antennas. However, at UHF the ground cannot be assumed to be highly conducting and a new approach is necessary. A method is presented to predict the input impedance and pattern of a dielectric-coated traveling-wave antenna buried in lossless ground. View full abstract»

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  • The diffraction matrix for a discontinuity in curvature

    Publication Year: 1972, Page(s):326 - 333
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (584 KB)

    To enlarge the scope of the geometrical theory of diffraction, the diffraction matrix for a surface singularity where the curvature but not the slope is discontinuous is rigorously derived. The model that is employed consists of two parabolic cylinders of different latus recta joined together at the front, thereby creating a line discontinuity of the required form. For each of the two principal po... View full abstract»

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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