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Antennas and Propagation, IEEE Transactions on

Issue 3 • Date May 1971

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

    Publication Year: 1971 , Page(s): 0
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1971 , Page(s): c4
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    Freely Available from IEEE
  • Phase properties of backscattered fields from thin rods

    Publication Year: 1971 , Page(s): 450 - 451
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (240 KB)  

    Numerical and analytical calculations show the phase of backscatter fields from thin perfectly conducting rods at constant distance from the scatterer to become essentially independent of aspect angle for rod lengths less than \lambda /2 , to approach a limit near 180\deg for shorter rods, and in broadside directions t... View full abstract»

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  • Imperfectly conducting cylindrical antenna: Variational approach

    Publication Year: 1971 , Page(s): 435 - 436
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (224 KB)  

    Driving point admittances of resistive cylindrical dipoles are computed by a variational method, using the two-term trial function for current proposed by King and Wu. The theoretical admittances are in excellent agreement with experimental results. View full abstract»

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  • An agar-agar chamber for study of electromagnetic waves in an inhomogeneous medium

    Publication Year: 1971 , Page(s): 365 - 377
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1216 KB)  

    A medium for the propagation of electromagnetic waves whose dielectric constant or loss tangent has a prescribed profile was fabricated by using a large quantity of agar-agar in simulation chambers. The dielectric constant of the agar-agar could be changed continuously by means of a controlled diffusion of ethyl alcohol. The loss tangent of the same medium could be changed continuously by means of... View full abstract»

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  • Transmission of electromagnetic waves into time-varying media

    Publication Year: 1971 , Page(s): 417 - 424
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (624 KB)  

    Expressions are obtained for the electromagnetic fields transmitted into the time-varying medium when a plane wave is incident upon either a dielectric or dispersive half-space. Solutions are obtained for the case when the medium is changed in a stepwise fashion, and also for the case when the medium varies slowly and continuously. View full abstract»

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  • Image theory for bianisotropic media

    Publication Year: 1971 , Page(s): 451 - 452
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (232 KB)  

    Image theory in bianisotropic media in the presence of a perfectly conducting plane is derived. The conventional image theory is shown to apply for crystals with two principal axes parallel to the conducting plane, for gyrotropic media with magnetostatic fields perpendicular to the plane, and for all such media uniformly moving parallel to the plane. View full abstract»

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  • Multiple scattering of EM waves by spheres part II--Numerical and experimental results

    Publication Year: 1971 , Page(s): 391 - 400
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (808 KB)  

    In [8], both low- and high-frequency solutions to the two-sphere problem were presented in a form suitable for efficient computer solution, Here, numerical results are presented using a method which has enabled the first appearance of reliable results for the scattered field from two spheres of radii larger than one wavelength and as large as ten or more. Radar cross sections (RCS) are computed fo... View full abstract»

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  • Computer-aided analysis of a finite arbitrarily shaped dielectric antenna

    Publication Year: 1971 , Page(s): 444 - 445
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (216 KB)  

    A numerical method of analysis is developed to determine the characteristics of a homogeneous dielectric antenna of arbitrary shape based on a general expression of electromagnetic wave scattering by a homogeneous dielectric body derived by Barrar and Dolph. This method is tested on a dielectric-disk antenna. View full abstract»

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  • The cylindrical antenna as a probe for studying the electrical properties of media

    Publication Year: 1971 , Page(s): 406 - 416
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (864 KB)  

    When a base-driven cylindrical monopole (or center-driven dipole) is immersed in an arbitrary medium, the electric and magnetic fields on its surface depend not only on its length and radius but also on the effective conductivity and permittivity of the medium. These fields can be explored and measured with small probes designed to travel along the cylindrical surface of the antenna. The interpret... View full abstract»

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  • Radiation from a slot antenna in a ground plane coated with a moving plasma sheath

    Publication Year: 1971 , Page(s): 401 - 405
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (416 KB)  

    The electromagnetic radiation from a slot antenna in a conducting plane coated with a moving isotropic cold plasma layer is considered. It is assumed that the direction of motion of the layer is across the slot, which is taken to be infinitely long. An integral representation for the field radiated through the plasma layer is obtained and evaluated asymptotically in the far zone by the method of s... View full abstract»

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  • Excitation of surface wave on circular-loop array

    Publication Year: 1971 , Page(s): 433 - 435
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (288 KB)  

    A method is presented of analyzing surface-wave excitation to an infinite periodic linear array in which only one element is excited and all others are parasitic. The approach taken in the analysis is based on the properties of the periodic structure. A formal solution for the current distribution on the array element is obtained, and the propagation constant of the surface wave is also found. In ... View full abstract»

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  • A technique for solution of Maxwell's equations in a moving dielectric medium

    Publication Year: 1971 , Page(s): 455 - 456
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (192 KB)  

    A simple technique is presented for converting a known solution for the electric and magnetic vector fields in a dielectric medium at rest into the corresponding fields in a moving dielectric medium. The technique combines methods presented by Tai [1] with a scaling procedure developed by Clemmow [2]. Tai's work reduces the moving medium problem to the solution of Maxwell's equations in a uniaxial... View full abstract»

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  • Synthesis of the fields of a transverse feed for a spherical reflector

    Publication Year: 1971 , Page(s): 310 - 320
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1056 KB)  

    The problem of designing a transverse feed for a spherical reflector is considered and a method is presented for synthesizing the fields on a surface of a sphere enclosing a feed that will produce a specified reflected field at the surface of a spherical reflector. The method identifies the reflector and a spherical surface enclosing the feed as a boundary value problem and uses a finite set of sp... View full abstract»

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  • Multiple scattering of EM waves by spheres part I--Multipole expansion and ray-optical solutions

    Publication Year: 1971 , Page(s): 378 - 390
    Cited by:  Papers (58)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1000 KB)  

    Solution to the multiple scattering of electromagnetic (EM) waves by two arbitrary spheres has been pursued first by the multipole expansion method. Previous attempts at numerical solution have been thwarted by the complexity of the translational addition theorem. A new recursion relation is derived which reduces the computation effort by several orders of magnitude so that a quantitative analysis... View full abstract»

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  • Optimum pulse transmission through an exponential plasma inhomogeneity

    Publication Year: 1971 , Page(s): 453 - 455
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (248 KB)  

    The optimum transmission of electromagnetic waves through a thin exponentially inhomogeneous plasma region is treated in this communication. Matched filter theory is used in obtaining integral expressions for optimum transmitted signals, which result in received signals that have the largest possible amplitude when transmitted through the plasma region. The fast Fourier transform algorithm is used... View full abstract»

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  • Correlating antenna array

    Publication Year: 1971 , Page(s): 447 - 450
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (392 KB)  

    A set of arbitrarily located receiving antenna elements, each connected with an appropriate network, can be used to construct a matched filter where the antenna array response results in an autocorrelation of a specified desired signal, correlating over time and space coordinates simultaneously. A receiving system using such a signal processing antenna can discard interferences which do not have t... View full abstract»

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  • A comparison of the full-wave and WKB solutions of a plane wave with impulsive time variation reflected from a sech2electron-density profile

    Publication Year: 1971 , Page(s): 456 - 458
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (272 KB)  

    This communication compares a more general numerical point-to-point transient wave propagation program to a known analytical (full-wave) solution based upon a certain special geometry and ionospheric profile. The main purpose of the comparison is that of using the known analytical results as a test case for the numerical program. The parameters of the ionosphere were chosen to purposively tax the ... View full abstract»

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  • Analysis of multiple-arm conical log-spiral antennas

    Publication Year: 1971 , Page(s): 320 - 331
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (624 KB)  

    An N -arm log-spiral antenna may be excited in N - 1 orthogonal modes of N -tuple input. A rigorous solution to the spiral antenna of more than two arms is obtained by numerical solution of the integral equations. Results for a four-arm spiral, including current distribution, half-powe... View full abstract»

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  • On a method for array design by matrix inversion

    Publication Year: 1971 , Page(s): 446 - 447
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (224 KB)  

    Matrix methods described earlier for array design for a specified pattern are limited in that the number of values that can be specified in the far-zone field must equal the number of independent applied excitation voltages. In this communication an extension is described to handle cases where the number of specified values exceeds the number of independent applied excitations. View full abstract»

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  • High-frequency backscatter from terrain with cement-block walls

    Publication Year: 1971 , Page(s): 343 - 347
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (456 KB)  

    The measurements of high-frequency (HF) radar cross sections (RCSs) \sigma of trees on a large flat field were reported a few years ago by Steele. This work used a special adaptation of the standing-wave method to 26 MHz. Shortly afterward, the present author used the same apparatus to measure the (RCSs) of cement walls erected on the same terrain. Wall sizes... View full abstract»

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  • Asymptotic theory of pulse compression in dispersive media

    Publication Year: 1971 , Page(s): 424 - 432
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (888 KB)  

    This paper deals with the long distance propagation of FM pulses in dispersive media. The treatment is based on an asymptotic theory which utilizes space-time rays and plane wave dispersion surfaces as well as integral representations. The discussion includes the propagation of prescribed FM signals in homogeneous media as well as synthesis of signals to achieve maximum pulse compression. Special ... View full abstract»

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  • Diffraction by arbitrary cross-sectional semi-infinite conductor

    Publication Year: 1971 , Page(s): 358 - 364
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (520 KB)  

    This paper investigates the problem of diffraction of an electromagnetic wave by a semi-infinite conductor by means of the computer method based on an integral equation formulation. The cross section of the conductor can have an arbitrary shape, provided the face shined by the incident wave is a uniform plane in the region far from the edge. In that plane region, the problem is simply that of refl... View full abstract»

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  • Optimization criterion for illuminating circular antenna apertures

    Publication Year: 1971 , Page(s): 436 - 443
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (560 KB)  

    For many applications the ideal antenna pattern is one in which radiated power is spread uniformly over the cone \theta < \theta_{0} , with no power going outside that cone. For example, either the target orientation or the antenna axis may only be known with tolerance \theta_{0} . While this ideal pattern is unachievab... View full abstract»

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  • Radiation resistance of antennas in lossy media

    Publication Year: 1971 , Page(s): 443 - 444
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (224 KB)  

    Using the concept of modified power density, expressions are derived for the radiation resistance and efficiency of antennas in a dissipative medium. View full abstract»

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Aims & Scope

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

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Editor-in-Chief                                                 Kwok W. Leung