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Antennas and Propagation, IEEE Transactions on

Issue 12 • Date December 1984

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Displaying Results 1 - 24 of 24
  • [Front cover and table of contents]

    Publication Year: 1984 , Page(s): 0
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1984 , Page(s): c4
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    Freely Available from IEEE
  • A method for computing scattering by large arrays of narrow strips

    Publication Year: 1984 , Page(s): 1327 - 1334
    Cited by:  Papers (1)
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    The electromagnetic scattering characteristics of an array of narrow, conducting strips can he developed readily by extending the work of Butler and Wilton who show that Chebyshev polynomials augmented with the edge condition can be used to solve the narrow-strip/narrow-slot integral equations. The strips reside in a homogeneous medium of infinite extent and are considered narrow relative to wavelength in the medium at the frequency of excitation. The unknown current distributions on the strips are represented as linear combinations of certain basis functions that are exact solutions to the approximate equation for an isolated narrow strip subject to a special excitation. The resulting power-series treatment allows easy calculation of the coupling terms among the strips in the array in a simple matrix equation by which the unknown coefficients in the current distribution expansions may be readily computed. With these coefficients, one can obtain the distribution of current on each strip and the total scattered field. The method is particularly well suited for handling large arrays with more strips than could be accommodated by the usual moment method. Numerical data-currents and scattered fields-are presented for various cases of interest. View full abstract»

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  • Equivalence of surface current and aperture field integrations for reflector antennas

    Publication Year: 1984 , Page(s): 1355 - 1358
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (432 KB)  

    The "extinction theorem" is used to prove that the fields of reflector antennas determined by integration of the current on the illuminated surface of the reflector are identical to the fields determined by aperture field integration with the Kottler-Franz formulas over any surface S_{a} that caps the reflector. As a corollary to this equivalence theorem, the fields predicted by integration of the physical optics (PO) surface currents and the Kottler-Franz integration of the geometrical optics (GO) aperture fields on S_{a} agree to within the locally plane-wave approximation inherent in PO and GO. Moreover, within the region of accuracy of the fields predicted by PO current or GO aperture field integration, the far fields predicted by the Kottler-Franz aperture integration are closely approximated by the far fields obtained from aperture integration of the tangential electric or magnetic field alone. In particular, discrepancies in symmetry between the far fields of offset reflector antennas obtained from PO current and GO aperture field integrations disappear when the aperture of integration is chosen to cap (or nearly cap) the reflector. View full abstract»

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  • Detection of multiscatter targets in K -distributed clutter

    Publication Year: 1984 , Page(s): 1358 - 1363
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (432 KB)  

    Results are obtained for the probability of single-pulse detection of an N -glint target immersed in K -distributed clutter. The results are applicable to low-grazing-angle detection of realistic targets in heavy ground and sea clutter. View full abstract»

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  • The design of a slot array in nonradiating dielectric waveguide, part II: Experiment

    Publication Year: 1984 , Page(s): 1341 - 1344
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB)  

    Measurement procedures for obtaining the self-impedance of an isolated inclined radiating slot in the metal wall of a nonradiating dielectric (NRD) waveguide are discussed. The design procedure for an antenna array fed by NRD-waveguide and making use of this information is described. As an example, the design, construction and evaluation of a ten-element input-matched broadside linear array is described. View full abstract»

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  • Array grating lobes due to periodic phase, amplitude, and time delay quantization

    Publication Year: 1984 , Page(s): 1364 - 1368
    Cited by:  Papers (26)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    Simple approximate formulas and generalized curves to evaluate the grating lobe levels of various kinds of contiguous subarrays with uniform illumination within each subarray are presented. The cases considered include phase quantization due to discrete phase shifters, amplitude taper at subarray input ports and time delay at the subarray input ports. In addition, the work is generalized to include certain cases of quantized phase or time delay at the input ports in addition to amplitude taper at subarray input ports. View full abstract»

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  • Application of the integral equation method of smoothing to random surface scattering

    Publication Year: 1984 , Page(s): 1308 - 1312
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (536 KB)  

    The integral equation method of smoothing (IEMS) is applied to the magnetic field integral equation (MFIE) weighted by the exponential \exp (jk_{1}\zeta ) where \zeta is the stochastic surface height. An integral equation in coordinate space for the average of the product of the surface current and the exponential factor is developed. The exact closed-form solution of this integral equation is obtained based on the specularity of the average scattered field. The complex amplitude of the average scattered field is thus determined by an algebraic equation which clearly shows the effects of multiple scattering on the surface. In addition, it is shown how the incoherent scattered power can be obtained using this method. Comparisons with the Kirchhoff approximation and the dishonest approach are presented, and the first-order smoothing result is shown to be superior to both. View full abstract»

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  • Broad-band microstrip antennas using additional resonators gap-coupled to the radiating edges

    Publication Year: 1984 , Page(s): 1375 - 1379
    Cited by:  Papers (59)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    A method for increasing the bandwidth of microstrip patch antennas by incorporating two additional resonators which are gap-coupled to the radiating edges of a rectangular patch is described. A two-dimensional analysis using Green's function and segmentation method is used for analyzing the proposed antenna configurations. A bandwidth as large as five times a single rectangular patch is obtained in S -band. Changes in the radiation pattern over this wide bandwidth are discussed. Experimental results are in reasonable agreement with the analysis. View full abstract»

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  • Fast computation of radiation integral for reflector antennas

    Publication Year: 1984 , Page(s): 1384 - 1385
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    A FORTRAN IV program to compute the field scattered by parabolic reflector antennas in a prescribed plane cut is presented. This program was executed on the UNIVAC 1100/80 at the University of Naples. A flowchart of the main program is provided View full abstract»

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  • Experimental results on bistatic rain scattering at 14.3 GHz

    Publication Year: 1984 , Page(s): 1345 - 1350
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (592 KB)  

    A bistatic rain scatter experiment at 14.3 GHz was conducted on two scattering paths. The experiment was made for more than two years on the Kashima-Inubo path and for more than one year on the Kashima-Hiraiso path. Statistical analyses of the data were made to obtain, e.g., cumulative distributions of the received power, worst month statistics of the received power, and cumulative duration time distributions of the received power. It is found that the effect of rain attenuation reduces statistical variations of the received power. A brief discussion on the prediction of the received power is presented. Also presented are the experimental results showing that the effect of antenna polarization on the received power is well described by the Mie theory. View full abstract»

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  • Monopole antenna on circular disk

    Publication Year: 1984 , Page(s): 1282 - 1287
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    The sinusoidal-Galerkin moment method is developed for the impedance of a monopole antenna at the center of a circular disk in free space. Numerical results are presented for the impedance and current distributions as a function of the disk radius. View full abstract»

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  • Synthesis of random antenna array patterns with prescribed nulls

    Publication Year: 1984 , Page(s): 1298 - 1307
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (792 KB)  

    Under study is a method devised to reduce sidelobes of thinned random antenna arrays over specified angular sectors. The thinned array is assumed random in the sense that the nominal location of the elements is known, but their actual position may vary randomly. It is shown that by imposing adequately dense pattern nulls, it is possible to reduce the sidelobes effectively in the region of the nulls. The problem is formulated as a set of points in the radiation pattern, which are constrained to specified values. The unknowns are the excitations, or weights, applied to the array elements. In the general case, the linear system of equations is consistent and has an infinite number of solutions. The solution selected optimizes the pattern in a minimum variance sense. Quantitative relations are derived for the pattern change and the gain cost associated with the imposed pattern nulls. Several examples are included to illustrate the results. View full abstract»

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  • Sum and tracking radiation patterns of a conical horn

    Publication Year: 1984 , Page(s): 1288 - 1291
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    The gain and the radiation patterns of a conical horn excited by a circular waveguide operating in the TE_{mn} and TM_{mn} modes are predicted. The expressions are rigorously derived by using the accurate calculation of the associated Legendre function with the real order and the integer degree. View full abstract»

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  • Characteristics of TV transmitting batwing antennas

    Publication Year: 1984 , Page(s): 1318 - 1326
    Cited by:  Papers (12)  |  Patents (1)
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    All of the characteristics of the batwing radiator, which is the heart of the superturnstile antenna system, are theoretically calculated by using the moment method. The matching condition is obtained on the basis of the characteristics in the cases of changing the shape of the jumper and of changing the distance between the support mast and the antenna elements. In this paper, a comparative study on the results of theoretical analysis and actual measurements was conducted as to whether or not the construction of the batwing antenna could be simplified by eliminating the element at its central part, without detracting its favorable characteristics. Next, regarding the mutual radiation impedance when arranged as a broadside array, a theoretical analysis was made according to the moment method, and the results were compared with measured values. As a result, in the case where this antenna was positioned at a distance exceeding full wavelength, the value was in the order of a few ohms, and it was found that mutual radiation coupling effect was small. View full abstract»

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  • The design of a slot array in nonradiating dielectric waveguide, part I: Theory

    Publication Year: 1984 , Page(s): 1335 - 1340
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    A set of theoretical design equations for a slot array fed by nonradiating dielectric (NRD) waveguide is developed. Mutual coupling between the slots cut into one of the metal walls of the waveguide is taken into consideration for a design that can have a predetermined radiation pattern. The theoretical development follows that of Elliott. View full abstract»

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  • Lyapunov stability of adaptive LMS array

    Publication Year: 1984 , Page(s): 1351 - 1354
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    The adaptive least mean square (LMS) array, particularly an array using reference signal reproduction processor (RSRP), is analyzed based on investigations of Lyapunov stability properties for the array weighting. The operation of the array utilizing RSRP is formulated as a Volterra integrodifferential equation. It is assumed as an essential condition that zero input to RSRP implies zero output. This condition makes the equation homogeneous and leads to an important result that the trivial solution for the equation has the Lyapunov asymptotic stability. Namely, the weighting for the array with RSRP might be drived to zero asymptotically. The servomechanism viewpoint also provides an intuitive understanding for the result. View full abstract»

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  • An accurate technique for measuring the on-axis axial ratio of circularly polarized feed systems

    Publication Year: 1984 , Page(s): 1379 - 1382
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    A method for swept-frequency measurement of the on-axis axial ratio of circularly polarized feed systems is described. The method is suitable for measuring the resultant axial ratio of a feed plus horn assembly. The performance of the feed (diplexer) alone may also be measured by using a simple terminating horn designed for very low reflection coefficient. A comparison with established techniques shows advantages for the new method, either in simplicity or accuracy. The precautions necessary to achieve the high degree of accuracy obtainable are also considered. View full abstract»

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  • A variable power dual mode network for reconfigurable shaped beam antenna

    Publication Year: 1984 , Page(s): 1382 - 1384
    Cited by:  Papers (2)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (216 KB)  

    A three output port variable power dual mode network is described. This network can be useful in driving a three element feed array feed of a communication satellite antenna to provide a dual mode reconfigurable shaped beam pattern. View full abstract»

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  • Green's function in the spectral domain for biaxial and uniaxial anisotropic planar dielectric structures

    Publication Year: 1984 , Page(s): 1273 - 1281
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB)  

    Green's function solutions of the biaxial and uniaxial anisotropic layered-medium planar-structure is formulated in terms of Maxwell's equations. Diagonalized biaxial and uniaxial permittivity tensors in the coordinate system of interest are treated. The Green's function is found in the double Fourier transformed domain for three longitudinal-to-an-axis coupled electric-magnetic field sets applied to a simple layered structure. The approach is applicable to structures having discontinuities in two orthogonal planar directions such as patch radiators or resonators. Spectral Green's function is usable in method-of-moment calculations assisted by Galerkin's method. View full abstract»

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  • Ported coax intrusion detection sensor

    Publication Year: 1984 , Page(s): 1313 - 1317
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    A ported coax intrusion sensor is a perimeter line sensor that utilizes VHF leaky coaxial cable(s) to generate guided waves for detecting an object near the cable(s). The theory of operation for ported coax intrusion sensors is described, including: 1) the basic mechanism of generating guided waves, 2) the propagation characteristics of these guided waves, 3) the scattering mechanism of the guided wave by a target, 4) the scattered signal formulation at the receiver, and 5) the signal processing techniques for detecting a moving target. View full abstract»

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  • Plane wave scattering from an infinite planar dipole array buried in a lossy half-space

    Publication Year: 1984 , Page(s): 1372 - 1375
    Cited by:  Papers (1)
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    The plane wave scattering from an infinite planar impedance-loaded dipole array buried in a lossy half-space is investigated theoretically and experimentally. Formulations for the scattering field and the input impedance of the dipole are derived by using Floquet's theorem and the induced electromotive force (EMF) method. In order to demonstrate the validity of these formulations, the numerical examples for a concrete as the lossy medium at frequency 9.32 (GHz) are compared with the experimental data. The results show that this array, even when loaded by zero impedance, can greatly suppress the radio wave reflection from the concrete surface by choosing the array dimensions properly and the depth of the array surface. View full abstract»

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  • Novel coordinate transformations for antenna applications

    Publication Year: 1984 , Page(s): 1292 - 1297
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB)  

    Coordinate transformations commonly encountered in antenna design and analysis are presented. The introduction of a new coordinate system, polarization coordinates, enables one to construct a complete flowchart which can be used to express any coordinate transformation matrix more directly and explicitly without going through the usual step-by-step derivation. Consequently, the computation procedure can often be greatly reduced by avoiding tedious manipulations. View full abstract»

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  • Improvement of a rain attenuation prediction method for terrestrial microwave links

    Publication Year: 1984 , Page(s): 1368 - 1372
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB)  

    An empirical model for predicting rain induced attenuation on terrestrial paths using effective path length is proposed. Comparison with the recently prediction method proposed by the International Radio Consultative Committee (CCIR) is made. It appears that our prediction method reveals good agreement with experimental data from different locations in the world. 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