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IEEE Transactions on Antennas and Propagation

Issue 4 • April 1984

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Displaying Results 1 - 25 of 27
  • [Front cover and table of contents]

    Publication Year: 1984, Page(s): 0
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    Freely Available from IEEE
  • An E-Field solution for a conducting surface small or comparable to the wavelength

    Publication Year: 1984, Page(s):330 - 339
    Cited by:  Papers (97)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (861 KB)

    A newE-field solution is presented for the electric current and electric charge induced on a perfectly conducting surface illuminated by an incident electromagnetic field. This solution is a moment solution to the electric field integral equation on the surface. The expansion functions consist of a set of functions suitable for expanding the magnetostatic current and a set of functions ... View full abstract»

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  • Approximate formulas for the far field and gain of open-ended rectangular waveguide

    Publication Year: 1984, Page(s):378 - 384
    Cited by:  Papers (85)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (634 KB)

    Approximate formulas are derived for the far field and gain of standard, open-ended, rectangular waveguide probes operating within their recommended usable bandwidth. (Such probes are commonly used in making near-field antenna measurements.) The derivation assumes first-order azimuthal dependence for the fields, and anE-plan pattern given by the traditional Stratton-Chu integration of t... View full abstract»

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  • Shortening ratios of modified dipole antennas

    Publication Year: 1984, Page(s):385 - 386
    Cited by:  Papers (72)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (178 KB)

    Two types of modified dipole antennas, zigzag and meander-line types, are analyzed and the shortening ratios are calculated. A zigzag dipole antenna with a wire length of 0.58 wavelengths has a shortening ratio of 24 percent with a resonant resistance of46 Omega. A meander-line dipole antenna with a wire length of 0.70 wavelengths has a shortening ratio of 30 percent with a resonant res... View full abstract»

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  • The application of the conjugate gradient method for the solution of electromagnetic scattering from arbitrarily oriented wire antennas

    Publication Year: 1984, Page(s):398 - 403
    Cited by:  Papers (53)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (569 KB)

    The method of conjugate gradients is applied to the analysis of radiation from thin-wire antennas. With this iterative technique, it is possible to solve electrically large arbitrarily oriented wire structures without storing any matrices as is conventionally done in the method of moments. The basic difference between the proposed method and Galerkin's method, for the same expansion functions, is ... View full abstract»

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  • On the extended boundary condition as applied to the dipole antenna problem

    Publication Year: 1984, Page(s):403 - 404
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (210 KB)

    It is shown that if the surface currents on a dipole antenna of revolution generate zero axialE-field on the interior symmetry axis of the antenna, then the entire interiorE-field is zero and the conventional boundary condition is satisfied. View full abstract»

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  • Broad-band half-wave dipole

    Publication Year: 1984, Page(s):410 - 412
    Cited by:  Papers (23)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    An ultrahigh frequency (UHF) fan-dipole is optimized for wide-band operation near the first resonance in order that the antenna could be used in a planar array of half-wavelength spaced elements operating over a conducting ground plane. The resultant voltage standing-wave ratio (VSWR) of the optimized dipole (with a50 Omegacoax input) is less than 2:1 over a 37 percent bandwidth. View full abstract»

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  • Transients on lossy transmission lines with arbitrary boundary conditions

    Publication Year: 1984, Page(s):418 - 422
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (334 KB)

    In this work the problem of transients on a lossy transmission line terminated by an arbitrary, including nonlinear, load is formulated. The tranmission line parameters are the constantsR, L, G, andC. The exact relation between the input and output voltages and currents in the form of two coupled integral equations is derived by the Laplace transform method. It is shown that ... View full abstract»

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  • VHF TV full channel loaded circular loop antenna

    Publication Year: 1984, Page(s):425 - 428
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (297 KB)

    A very high frequency (VHF) full channel room TV receiving antenna, with a voltage standing-wave ratio (VSWR)<2 in the full-band VHF is described. TheE- andH-plane patterns are nearly cardioid in shape, hence it has the advantage of eliminating the TV ghost interference caused by backward reflecting waves in a strong signal environment. The directional pattern and impedanc... View full abstract»

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  • Comments on "The singular integral problem in surfaces"

    Publication Year: 1984, Page(s):428 - 430
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The commenter questions the work of D.B. Miron (ibid., vol.AP-31, no.3, p.507-9, 1983) concerning the evaluation of the singular integral in the expression for the electric field at a point where electric current exists (e.g. reentry vehicle heatshields, plasma sheaths and wakes, charged-particle beams, semiconductors, biological tissues and other polarization media). The difficulty is caused by t... View full abstract»

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  • Comments on "A simple power series for radiation resistance of center-fed dipoles"

    Publication Year: 1984, Page(s):430 - 431
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    A recent communication by K.R. Jakobsen and J.A. Aas (ibid., vol.AP-31, no.4, p.638-9, 1983) presented a series method for computing radiation resistance of dipoles. An alternate method using a truncated infinite series is presented for making the same calculation View full abstract»

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  • Comments on "A new integration algorithm and its application to the analysis of symmetrical Cassegrain microwave antennas"

    Publication Year: 1984, Page(s): 431
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (61 KB)

    In a previous paper (ibid., vol.AP-31, no.5, p.748-55, 1983), an integration algorithm was applied to the physical optics analysis of the subreflector of a Cassegrain reflector configuration. It is shown how to circumvent some difficulties with the method by using the recurrence relation in the reverse direction View full abstract»

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  • [Back cover]

    Publication Year: 1984, Page(s): c4
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    Freely Available from IEEE
  • Effects of multiple scattering and Fresnel diffraction on random volume scattering

    Publication Year: 1984, Page(s):347 - 355
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    A wave incident on a volume of random fluctuations of medium parameters will be scattered in all directions. Two kinds of effects on random volume scattering are considered: 1) multiple scattering effect, and 2) Fresnel diffraction effect. The cumulative forward scattering is known to be responsible for the scintillation phenomenon. When strong, such cumulative or multiple scattering can drive the... View full abstract»

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  • Theory of terminated monopole

    Publication Year: 1984, Page(s):408 - 410
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The theory of a terminated folded monopole was previously studied by Josephson. The equivalent circuit used by that author was incorrect for a folded monopole when its arms are of different diameters. By using the decomposition scheme suggested by Uda and Mushiake we have solved the problem correctly. The circuit parameters involved in the theory are discussed in detail to supplement the work of U... View full abstract»

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  • A compact flush-mounting antenna with direction finding and steerable cardioid pattern capability

    Publication Year: 1984, Page(s):412 - 414
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    A flush-mounting antenna is described which could be used, in lieu of present antennas, to provide direction finding and steerable directional pattern capability in airborne beacon transponder systems. The antenna is comparable in size to the existing, omni-directional antennas presently used for air-traffic control and military identification, friend or foe (IFF) functions. The design and perform... View full abstract»

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  • High-frequency backscatter from a finned cylinder -- Comparison of UTD results with experiment

    Publication Year: 1984, Page(s):422 - 425
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The far backscattered field from a perfectly conducting, infinitely long, circular cylinder with a fin is calculated for the transverse electric (TE) and transverse magnetic (TM) cases, using the uniform theory of diffraction (UTD). The calculated results are compared to appropriate experimental measurements and good agreement is obtained. A derivation of the effective curvature of the wave diffra... View full abstract»

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  • Evaluation of Fourier transform integrals using FFT with improved accuracy and its applications

    Publication Year: 1984, Page(s):404 - 408
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    A new technique that significantly minimizes the aliasing error encountered in the conventional use of the fast Fourier transform (FFT) algorithms for the efficient evaluation of Fourier transforms of spatially limited functions (such as those that occur in the radiation pattern analysis of reflector antennas and planar near field to far field (NF-FF) transformation) is presented and illustrated t... View full abstract»

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  • A three-year study of radio wave propagating delays due to tropospheric water vapor

    Publication Year: 1984, Page(s):390 - 395
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    Measurements of the radio emission from the sky at 21.0 and 31.4 GHz have been made from May 1980 to April 1983 at the Onsala Space Observatory on the west coast of Sweden. A total of 483 such observations have been used to calculate the water vapor induced propagation delay of radiowaves penetrating the troposphere. A comparison with simultaneous radiosonde launches made at Gothenburg-Landvetter ... View full abstract»

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  • The current state of the reflector antenna art

    Publication Year: 1984, Page(s):313 - 329
    Cited by:  Papers (25)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2744 KB)

    The current state of the reflector antenna art is presented in the form of a review article, intended primarily for engineers who are new in the field. The properties of paraboloidal antennas are related to aperture efficiency, surface tolerance, feed defocusing, and aperture blocking. Other reflector shapes considered are offset-fed paraboloids, classical and offset Cassegrain systems, shaped-dua... View full abstract»

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  • The transient response of finite open circular cylinders

    Publication Year: 1984, Page(s):356 - 363
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    An eigenmode expansion formulation of the singularity expansion method based on the electric field integral equation is developed for the transient response of conducting finite open cylyinders. The eigenvalues and eigenfunctions of the impedance operator are calculated by the Galerkin method using entire domain expansion functions. The transient surface current density and backscattered far field... View full abstract»

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  • Quasiparticle description of pulse propagation in a lossy dispersive medium

    Publication Year: 1984, Page(s):395 - 398
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    It has been known from extensive saddle point analysis that pulses propagating in a lossy dispersive Lorentzian medium exhibit a high frequency forerunner and frequency chirping. The quasiparticle approximation permits an accurate and numerically efficient calculation of the forerunner frequency chirping with a simple physical explanation. For the case of a Gaussian incident pulse, the error in th... View full abstract»

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  • Infinite planar arrays of arbitrarily bent thin wire radiators

    Publication Year: 1984, Page(s):364 - 377
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1040 KB)

    A plane wave expansion moment method is presented for computing active impedances and current distributions of infinite planar arrays of thin wire radiating elements. The array lattices can be rectangular or triangular. The excitations can be plane waves or progressively phased voltage sources. Each radiating element, including feedline, can be any collection of bent thin wires. Results are given ... View full abstract»

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  • Closed form approximations to the inverse black body radiation problem

    Publication Year: 1984, Page(s):415 - 418
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The inverse black body radiation problem is the problem of determining the unknown area-temperature distribution of a black body from its radiated electromagnetic power spectrum. An exact iterative solution to this problem (the inverse Planck problem) was derived by this author in 1982. Recently Hamid and Ragheb derived a closed form approximation to this problem claimed to be valid for the Raylei... View full abstract»

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  • An orthogonal mode (Dual-sense) helical antenna

    Publication Year: 1984, Page(s):414 - 415
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    A helical antenna element, fed at both ends and situated above a ground plane, is used to generate both senses of circular polarization. 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