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IEEE Transactions on Antennas and Propagation

Issue 6 • November 1975

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  • [Front cover and table of contents]

    Publication Year: 1975, Page(s): 0
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  • Comments on methods applied to the evaluation of lateral waves

    Publication Year: 1975, Page(s):870 - 872
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (247 KB)

    To apply the method of steepest descent to the evaluation of lateral waves when the observing point and the source are located in different media with respect to each other, it is recommended that one first change the variable of integration according to Snell's law and then apply the method of operators. The merits and limitations of this method, compared with the usual direct one, are discussed. View full abstract»

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  • Correction to "Application of electromagnetic inverse boundary conditions to profile characteristics inversion of conducting spherical shapes"

    Publication Year: 1975, Page(s): 872
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (78 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1975, Page(s): c4
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    Freely Available from IEEE
  • Phase and amplitude scintillations in the 10 to 40 GHz band

    Publication Year: 1975, Page(s):792 - 797
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    Simultaneous measurements of phase and amplitude variability were made on a 64 km slant path using five radio frequencies: 9.55, 19.1, 22.2, 25.4, and 33.3 GHz. The three middle frequencies were chosen for their relation to water vapor absorption. The amplitude data show occasional fades in excess of 20 dB superimposed on ubiquitous smaller scintillations of several decibels. The latter generally ... View full abstract»

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  • Approximate mode conversion coefficients in the Earth-ionosphere waveguide

    Publication Year: 1975, Page(s):868 - 870
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Constant impedance boundary conditions have been used by many authors to obtain mode reflection and transmission coefficients for propagation across a land-sea discontinuity. The impedance boundary conditions are here replaced by exact boundary conditions and similar formulae are obtained for propagation between a diffuse inhomogeneous isotropic ionosphere and a homogeneous isotropic earth. These ... View full abstract»

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  • Attenuation of 8.6 and 3.2 mm radio waves by clouds

    Publication Year: 1975, Page(s):782 - 786
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Measured attenuations associated with a variety of cloud conditions at wavelengths near 8.6 and 3.2 mm are reported. Two specific events, during which heavy rain clouds covered the sky, are examined and statistical data collected over a six-month period on a variety of cloud types are presented. The number of observations of some cloud types was not large and it was not possible to account for the... View full abstract»

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  • Shaped-beam horn-reflector antennas

    Publication Year: 1975, Page(s):757 - 763
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    A design method for a horn-reflector antenna, which has a beam of arbitrary cross section, is developed. To show the effectiveness of the design theory, the measured data of an electrical model of Japan's domestic communications satellite antenna of this type are shown in comparison with calculated results. The design theory is based on geometrical optics, and is applicable not only to a horn-refl... View full abstract»

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  • Near-field centripetal scattering from dielectric spheres

    Publication Year: 1975, Page(s):864 - 866
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The fields scattered from small dielectric spheres illuminated by a plane wave have been computed as part of a study of spherical dielectric antennas. Studies of scattering of 3 cm wavelength from a 6.6 cm diameter sphere of dielectric constant between 2 and 3 show large regions on the surface of the sphere where the Poynting vector is inwardly directed. These regions form sidelobes of inwardly di... View full abstract»

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  • A note on the measurement and interpretation of the average power in troposcatter

    Publication Year: 1975, Page(s):866 - 868
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The simulation of the tropospheric scatter mechanism by Birkemeier et al. [1], [2] has been extended to include the computation of the instantaneous variation of the average power for 1-h data segments. This average can be interpreted as a measurement of the spatial variation of the refractivity turbulence within an elevated layer of the atmosphere and can serve as a guide to the interpretation of... View full abstract»

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  • Dynamic measurement of forward scattering

    Publication Year: 1975, Page(s):846 - 850
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A dynamic method for the measurement of forward scattering in a radio anechoic chamber is described. The quantity determined is the induced-field-ratio (IFR) of conducting cylinders. The determination of the IFR is highly sensitive to 1) multiple scattering between the cylinder and the obpring antenna and 2) extraneous scattering from the lining of the anechoic chamber. In order to eliminate the i... View full abstract»

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  • Prediction methods for rain attenuation statistics at variable path angles and carrier frequencies between 13 and 100 Ghz

    Publication Year: 1975, Page(s):786 - 791
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Fade depth and space diversity statistics of propagation along earth-satellite paths have been calculated from radar reflectivity data of rain using modeling procedures. The reflectivity data base was obtained during the summer of 1973 at Wallops Island, Va., using a high resolution S band radar interfaced with a computer and digital processing system. Fade sta... View full abstract»

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  • Nomographs for phase centers of conical corrugated and TE11mode horns

    Publication Year: 1975, Page(s):858 - 859
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    Practical and convenient monographs, for obtaining the phase centers of corrugated conical horns and conical horns excited in TE11mode, are presented. Given the length of horn, the radius of aperture, and the distance from aperture to observation point along the horn axis, the location of the phase center can be directly found on these nomographs. View full abstract»

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  • Radiating dipole antenna with tapered impedance loading

    Publication Year: 1975, Page(s):811 - 814
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The far-field radiated waveform and field pattern from a thin dipole antenna in the transmission line approximation are considered when the antenna is driven by a voltage generator of waveform V_{0}u(t) , where u(t) is the unit step function. The antenna is loaded with a tapered form of loading and is permitted to include... View full abstract»

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  • Volume-type holographic antenna

    Publication Year: 1975, Page(s):807 - 810
    Cited by:  Papers (19)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A new type of holographic antenna based on the principle of the volume hologram is proposed. The characteristics of the prototype are examined. The antenna has a unidirectional beam with a front-to-back ratio of 20 dB. The practical frequency handwidth is about 10 percent of the center frequency. The antenna is unique in that the feed point is placed in the plane of the holographic plate so that b... View full abstract»

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  • The far-field response of a step-excited linear antenna using SEM [singularity expansion method]

    Publication Year: 1975, Page(s):834 - 838
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Previous investigation of the use of the singularity expansion method (SEM) for analyzing antennas or scatterers has concentrated on the behavior of currents and charges on a conducting body. In this paper the previous work is extended by defining the far-field natural modes for the linear antenna. The transient radiation pattern is then computed for a step-excited center-fed linear antenna. View full abstract»

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  • Optimized symmetric discrete line arrays

    Publication Year: 1975, Page(s):860 - 862
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A generalization of Dolph's method for the synthesis of discrete antenna arrays is applied to six different symmetric line arrays. Based on these examples, it is concluded that 1) the field patterns of optimized symmetric line arrays with the same number of elements and with the same aperture are virtually indistinguishable and 2) optimized arrays with an odd number of elements are substantially b... View full abstract»

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  • Some corrections to published formulas on biconical structures immersed in spherically stratified media

    Publication Year: 1975, Page(s): 864
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    First Page of the Article
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  • High frequency scattering from an open-ended semi-infinite cylinder

    Publication Year: 1975, Page(s):770 - 776
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A simple high-frequency asymptotic expression for the backscattered field from a semi-infinite hollow circular cylinder is derived from the exact Weiner-Hopf solution. The resultant equations are valid for both polarizations and can be easily numerically evaluated. Comparisons of the computed results and the measured data acquired through the utilization of a sub-nanosecond pulse radar system are ... View full abstract»

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  • Rain depolarization measurements on a satellite-earth propagation path at 4 GHz

    Publication Year: 1975, Page(s):854 - 858
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The effect of rain depolarization has been calculated as a function of rain rate, path length, and frequency based upon Oguchi's calculations of differential phase shift and differential attenuation due to oblate raindrops. The experimental values generally agree with the theoretical predictions, but the latter tend to underestimate the effect. This underestimation is possibly due to some near-fie... View full abstract»

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  • Application of Fourier transforms for microwave radiometric inversions

    Publication Year: 1975, Page(s):797 - 806
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    Existing microwave radiometer technology now provides a suitable method for remote determination of the ocean surface's absolute brightness temperature. To extract the brightness temperature of the water from the antenna temperature, an unstable Fredholm integral equation of the first kind is solved. Fourier transform techniques are used to invert the integral after it is placed into a cross corre... View full abstract»

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  • Phased array antennas with dielectric fin aperture loading

    Publication Year: 1975, Page(s):824 - 829
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    Planar waveguide array structures in which some form of dielectric matching is introduced, either in the form of a continuous sheet above the array face or dielectric plugs in the apertures, have received considerable attention in the literature. An alternative construction has one central dielectric fin or two edge dielectric fins in each rectangular waveguide aperture. Schaedla [2] has given a t... View full abstract»

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  • A technique for extracting the poles and residues of a system directly from its transient response

    Publication Year: 1975, Page(s):777 - 781
    Cited by:  Papers (135)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A novel approach for systematically deriving the complex poles and residues of a structure from a set of time-domain data is presented. The method is based on Prony's algorithm which involves the inversion of two matrices and a solution of the zeros of an n th degree polynomial, n being the number of desired poles. Two numer... View full abstract»

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  • Radiation pattern synthesis of planar antennas using the iterative sampling method

    Publication Year: 1975, Page(s):764 - 769
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    A synthesis method is presented for determining an excitation of an arbitrary (but fixed) planar source configuration. The desired radiation pattern is specified over all or part of the visible region. It may have multiple and/or shaped main beams with low sidelobes. The iterative sampling method is used to find an excitation of the source which yields a radiation pattern that approximates the des... View full abstract»

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  • Study of efficiency of spherical Gregorian reflector

    Publication Year: 1975, Page(s):819 - 824
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The use of the current distribution method to analyse the field in the image space of a spherical Gregorian antenna when the main dish is illuminated by a linearly polarized plane wave is discussed. It is shown that the incident field distribution at the subdish is rather irregular, although it can be approximated by a smooth Gaussian distribution curve. In addition, it is possible to design a sim... 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                                                 Kwok W. Leung