IEEE Transactions on Antennas and Propagation

Issue 8 • August 1987

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Displaying Results 1 - 22 of 22
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): 0
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    Freely Available from IEEE
  • Spatial spectral estimation using multiple beam antennas

    Publication Year: 1987, Page(s):897 - 906
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (983 KB)

    The processing simplifications which result in using a multiple beam antenna (MBA) as a spatial sensor for performing spectral estimation are considered. Sources are presumed to be located over a two-dimensional field of view characterized by the two angular coordinatesthetaandphi. The MBA configuration consists of an aperture (usually either a reflector or lens) illuminated ... View full abstract»

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  • Approximate synthesis of nonseparable design responses for rectangular arrays

    Publication Year: 1987, Page(s):907 - 912
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (654 KB)

    A method is presented for the approximation of any real, symmetrical, nonseparable array design response polynomial of orderM - 1-by-N - 1for rectangular arrays withMbyNuniformly spaced elements (M geq N). Previously a sampling method has been used to exactly synthesize response functions of a single variable byNelement line arrays ... View full abstract»

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  • Fade duration statistics ofL-band multipath fading due to sea surface reflection

    Publication Year: 1987, Page(s):956 - 961
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (545 KB)

    Multipath fading in maritime satellite communications may be caused by a combination of sea surface reflection and tropospheric effects such as ducting and scintillations. Among them, multipath fading due to sea reflection is dominant when receiving satellite signals by use of a wide beamwidth antenna. In this paper, fade duration statistics of multipath fading due to sea surface reflection are an... View full abstract»

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  • Measurement of the electrical constitutive parameters of materials using antennas, part II

    Publication Year: 1987, Page(s):962 - 967
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (685 KB)

    The previously developed technique for measuring the electrical constitutive parameters of materials using a single monopole antenna is extended to include a monopole with closely spaced parasitic elements. The addition of the parasitic elements reduces the radiation from the antenna and, in turn, reduces the effect of reflections from material boundaries on the measurement. This allows smaller vo... View full abstract»

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  • Generation of nearly hemispherical and high gain azimuthally symmetric patterns with printed circuit antennas

    Publication Year: 1987, Page(s):972 - 977
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (544 KB)

    Pattern shaping techniques are discussed for printed circuit antennas such as microstrip dipoles and slot elements. Crossed printed circuit dipoles or a combination of a printed circuit dipole and a slot are employed. It is demonstrated that with the proper choice of substrate or substrate-superstrate parameters it is possible to generate: 1) nearly hemispherical patterns, 2) high-gain azimuthally... View full abstract»

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  • Radiation properties of the optimized offset-fed radial rib umbrella reflector antenna

    Publication Year: 1987, Page(s):977 - 980
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (288 KB)

    The properties of the offset-fed radial rib umbrella reflector are analyzed. A simple formula for positioning the feed to maximize the gain is given. The best aim point for the feed is numerically determined to be very close to the rib center. The exponent of acos^{n} alphafeed pattern, evaluated for maximum gain, and the loss due to the gores is presented. It is shown that the offset c... View full abstract»

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  • Measuring radar cross section at short distance

    Publication Year: 1987, Page(s):991 - 996
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (445 KB)

    Radar cross sections (RCS) must be measured at large distance. We exclude here the special near-field methods. The distance (R) must be so large that different RCS contributions are added in the same way as at infinite distance. This leads to the ruleR > 2D^{2}/lambdaif the target cross range is confined withinpm D/2and a phase error ofpi /4is tolerated. It is s... View full abstract»

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  • Aperture efficiency of Itapetinga 45-ft antenna at λ = 3.3 mm

    Publication Year: 1987, Page(s):996 - 1000
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (454 KB)

    The aperture efficiency atlambda = 3.3mm of the 45-ft Itapetinga reflector was found to be of about 25 percent. This radiometric result suggests an equivalent surface accuracy of less than 0.25 mm, root sum square (rss) assuming a Gaussian distribution of errors, which is much smaller than the actual rss estimated for the dish (i.e., 0.37 mm, rss) and, represents a 5 dB improvement in g... View full abstract»

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  • Correction to "Complex polynaomial phase integration"

    Publication Year: 1987, Page(s): 1000
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (55 KB)

    First Page of the Article
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  • Lateral wave propagation in a wedge shaped region

    Publication Year: 1987, Page(s):947 - 955
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (888 KB)

    Lateral wave propagation in a wedge shaped region is examined. The geometry consists of two media, the lower one of which is bounded from below by a conducting plate. The plate intersects the interface between the two media from below at an oblique angle. The transmitting antenna is an infinite, time harmonic, electric line source located close to the interface between the two media, and oriented ... View full abstract»

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  • A uniform GTD solution for the far-field scattering by polygonal cylinders and strips

    Publication Year: 1987, Page(s):983 - 986
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (408 KB)

    The results of our recent asymptotic treatment of the double diffraction by a pair of parallel perfectly conducting wedges are applied to polygonal cylinders and strips. The combination of the appropriate nonuniform expression for the doubly diffracted ray field with the nonuniform geometrical theory of diffraction (GTD) expressions for the singly diffracted fields yields a uniform, closed-form so... View full abstract»

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  • K-pulse estimation from the impulse response of a target

    Publication Year: 1987, Page(s):926 - 933
    Cited by:  Papers (16)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (680 KB)

    A simple and general method is used to estimate the K-pulse of a target from its Fourier synthesized impulse response. The approach is based on minimization of energy content outside the K-pulse response duration. The method is simple because it only deals with Dirac delta functions in integrals. It is general because the method only manipulates samples of a continuous function as a computer does.... View full abstract»

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  • Scattering center analysis via Prony's method

    Publication Year: 1987, Page(s):986 - 988
    Cited by:  Papers (94)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (368 KB)

    High-frequency scattering can often be described in terms of scattering centers, and an understanding of the geometries which give rise to these centers is important in the area of radar cross section modification. Certain canonical geometries have been treated theoretically with asymptotic methods, but, in general, one must study the behavior of scattering centers empirically. Prony's method prov... View full abstract»

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  • Space-frequency sampling criteria for electromagnetic scattering of a finite object

    Publication Year: 1987, Page(s):920 - 925
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (728 KB)

    The sampling criteria in the wavenumber space for generating the spatial impulse response of a finite target is described. A proper choice of canonical confinement for the target in space can greatly reduce the number of samples required to sufficiently characterize the target's spatial impulse response. Though a sampling lattice may be more efficient in the sense of a reduced number of measuremen... View full abstract»

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  • The electromagnetic inverse scattering problem for layered dispersionless dielectrics

    Publication Year: 1987, Page(s):934 - 946
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (976 KB)

    The problem of exactly reconstructing the one-dimensional refractive index profile of a dispersionless dielectric from reflection data is considered. The available data consist of reflection coefficient measurements at many wavenumbers due to a normally incident electromagnetic plane wave upon a dielectric half-space or equivalently the impulse response measurement of the half-space. A closed-form... View full abstract»

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  • On the polarimetric contrast optimization

    Publication Year: 1987, Page(s):988 - 991
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (448 KB)

    The problem considered is one of finding the polarization state of an antenna such that a power ratio due to two different objects is optimized. It is reduced to an optimization problem of two Hermitian forms which can be simultaneously diagonalized using a well-known linear-algebraic construction. The corresponding polarization vectors are found. The calculations are performed directly on the exp... View full abstract»

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  • The effect of discrete scatterers on a low sidelobe antenna

    Publication Year: 1987, Page(s):981 - 983
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (360 KB)

    The effect of randomly distributed scatterers placed in the far field of an antenna is explored. A technique for predicting the effects of specular scatterers on antenna performance has been developed. Laboratory testing of a low sidelobe antenna indicated an acceptable low sidelobe level. However, when the antenna was field tested, it exhibited average radiated power levels off the main beam that... View full abstract»

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  • Resonance and radiation of the elliptic disk microstrip structure, part I: Formulation

    Publication Year: 1987, Page(s):877 - 886
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (720 KB)

    The analysis of resonance, input impedance, and radiation of the elliptic disk microstrip structure is rigorously formulated, using the scalar and vector Mathieu transforms. With the help of these transforms, the resonance frequencies of the structure can be derived exactly using Galerkin's method and approximately using a perturbational approach. Expressions for the input impedance and the radiat... View full abstract»

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  • A lattice orthogonalization technique for integrated square error minimization

    Publication Year: 1987, Page(s):913 - 919
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (552 KB)

    A recursive integrated square error minimization technique is developed to solve integral equations occurring in electromagnetic scattering problems. The underlying idea is a generalization of the concept of the second minimization step recently proposed by van den Berg. This is implemented by a structured lattice algorithm similar to the lattice algorithms which emerged in the last decade in sign... View full abstract»

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  • A planar broad-band flared microstrip slot antenna

    Publication Year: 1987, Page(s):968 - 972
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (704 KB)

    Experimental results have been obtained on a planar multioctave bandwidth flared microstrip slot. When crossed, the element is capable of horizontal, vertical, or circular polarization. A design was fabricated and measurements were taken to define the performance. The input impedance and radiation characteristics are shown to have a broadband response when configured as a cavity-backed element. View full abstract»

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  • On the theory of the synthesis of single and dual offset shaped reflector antennas

    Publication Year: 1987, Page(s):887 - 896
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (880 KB)

    Since Kinber (Radio Technika and Engineering-1963) and Galindo (IEEE Trans. Antennas Propagat.-1963/1964) developed the solution to the circular symmetric dual shaped synthesis problem, the question of existence (and of uniqueness) for offset dual (or single) shaped synthesis has been a point of controversy. Many researchers thought that the exact offset solutions may not exist. Later, Galindo-Isr... View full abstract»

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

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Editor-in-Chief                                             Danilo Erricolo