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IEEE Transactions on Antennas and Propagation

Issue 4 • Date July 1973

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Displaying Results 1 - 25 of 34
  • [Front cover and table of contents]

    Publication Year: 1973, Page(s): 0
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    Freely Available from IEEE
  • Preface

    Publication Year: 1973, Page(s): 417
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1973, Page(s): c4
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    Freely Available from IEEE
  • Recording of dynamic antenna radiation patterns

    Publication Year: 1973, Page(s):574 - 576
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A concept is presented for recording antenna radiation patterns as functions of two parameters simultaneously. An implementation of the technique results in a significant savings in the measurement time required to document antenna performance as a function of the particular pair of parameters of interest. Application of the concept to beam scanning and frequency scanning antennas is discussed. View full abstract»

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  • Astigmatism in reflector antennas

    Publication Year: 1973, Page(s):565 - 567
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The characteristics of the astigmatic phase error in large parabolic reflector antennas are described. A procedure for focusing an antenna and diagnosing the presence and degree of astigmatism is given. View full abstract»

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  • Weissfloch transformer for antenna impedance measurements

    Publication Year: 1973, Page(s):585 - 588
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    An antenna impedance measurement technique based on the Weissfloch transformer theorem is described. In this method the antenna impedance is compared to a normalizing load whose value can be determined to a high degree of precision. The method provides a perfect transformer action between the antenna terminals and a point in the input transmission line, with the known transformer ratio. Baluns and... View full abstract»

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  • Absolute calibration of antennas at extremely low frequencies

    Publication Year: 1973, Page(s):514 - 523
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    To calibrate electric-field sensors at extremely low frequency (ELF) the measured terminal voltage V at a receiving antenna is compared with the Analytically predicted V for a precisely known incident field. That incident field is generated by an electrically very short thin linear radiator. Formulas are given for the fi... View full abstract»

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  • Accurate boresight measurements of large antennas and radomes

    Publication Year: 1973, Page(s):567 - 569
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    A laser-mirror system incorporated into an antenna pattern range is capable of aligning the antenna tower to measure the radome boresight error of large antennas to within 0.1 mrad angular accuracy. The simplicity of the alignment system makes it relatively easy to position the antenna, with or without its radome to a preestablished mechanical reference plane. Hence, deflection of the antenna towe... View full abstract»

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  • Electromagnetic propagation between antennas submerged in the ocean

    Publication Year: 1973, Page(s):507 - 513
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    Experiments are described for determining the distributions of current, the driving-point impedance, and the electromagnetic fields characteristic of dipole antennas immersed in the sea near the surface. Measured and theoretical results are compared at two frequencies with good agreement. View full abstract»

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  • Spatial statistics of instrument-limited angular measurement errors in phased array radars

    Publication Year: 1973, Page(s):524 - 532
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    The major contributors to the random component of the instrument limited angular measurement errors in electronically scanned phased array radars are reviewed and formulas are developed for statistical modeling of these error sources. The error model employed is applicable to space-fed and certain types of corporate-fed arrays. A comprehensive computer program, embodying this analysis, has been de... View full abstract»

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  • Measurement techniques for antennas in dissipative media

    Publication Year: 1973, Page(s):499 - 507
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    Methods used to simulate dissipative media environments for antennas are reported and special techniques developed to determine the electrical properties of antennas in such media are discussed. Tank systems for simulating infinite homogeneous isotropic media characterized by ratios of \alpha /\beta in the range 0 < \alp...
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  • Quadratic antenna systems and noise excited antennas

    Publication Year: 1973, Page(s):479 - 483
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    A quadratic receiving antenna system is defined as a multiport antenna whose outputs are passed through square-law detectors, or, in pair, through correlators (product detectors). These detected signals are then linearly combined with different weights to give the output or response of the receiving system. A reciprocity relation is derived which relates the electromagnetic field radiated by a mul... View full abstract»

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  • Proximity effects for parallel rectangular conductors in nontransmission-line mode

    Publication Year: 1973, Page(s):583 - 585
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    In applications of electrically short antennas such as multiturn loops, variations in ohmic losses due to proximity effects can significantly affect uncorrected estimates of efficiency. This paper investigates experimentally the proximity effects on the current distributions and associated ohmic losses for two identical parallel rectangular cross-section conductors as a function of separation dist... View full abstract»

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  • Poincaré sphere representation of partially polarized fields

    Publication Year: 1973, Page(s):474 - 478
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The use of points on the surface of the poincaré sphere to represent the polarization state of fully polarized electromagnetic fields is extended to partially polarized fields by representing their polarization by points inside the sphere. The coordinates of a point \bar{W} representing the polarization state are shown to be simply related to the Stokes... View full abstract»

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  • Focused phased array measurements

    Publication Year: 1973, Page(s):564 - 565
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    Measurements describing the patterns of a linear phased array antenna which has been electronically focused to a point in the Fresnel region, located a few aperture widths distance from the array face are given. The measurements were taken inside a building with no effort made to reduce extraneous reflections. A comparison of the results with patterns taken on a conventional far-field range reveal... View full abstract»

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  • The generalized multiprobe reflectometer and its application to automated transmission line measurements

    Publication Year: 1973, Page(s):550 - 554
    Cited by:  Papers (23)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The multiprobe reflector can perform the measurements usually performed with the slotted line without the need for mechanical adjustment, thus making it ideal for automated systems. Theory is presented showing how impedance data may be obtained from three or more arbitrarily placed probes; the spacing need not be at any particular fraction of a wavelength thus permitting very wide band operation. ... View full abstract»

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  • VHF to EHF performance of a 90-ft quasi-tapered anechoic chamber

    Publication Year: 1973, Page(s):579 - 581
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    This paper reports the measured reflection characteristics of a 90-ft anechoic chamber operated by The Aerospace Corporation. The design of this chamber, described as quasi-tapered, is unique in that it tapers from a large rectangular test region to a smaller square transmitting end. This design incorporates the performance advantages of a fully tapered chamber at low frequencies with some of the ... View full abstract»

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  • Accurate measurement of antenna gain and polarization at reduced distances by an extrapolation technique

    Publication Year: 1973, Page(s):418 - 431
    Cited by:  Papers (56)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1464 KB)

    A new technique is described for determining power gain and polarization of antennas at reduced range distances. It is based on a generalized three-antenna approach which, for the first time, permits absolute gain and polarization measurements to be performed without quantitative a priori knowledge of the antennas. The required data are obtained by an extrapolation technique which includes provisi... View full abstract»

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  • Remote sensing of complex permittivity by multipole resonances in RCS

    Publication Year: 1973, Page(s):554 - 561
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    Both complex and real multipole resonance frequencies in radar cross section (RCS) of a dielectric sphere are studied in some detail. Charts of real resonance frequencies and peak values are presented, which are then used to determine the complex permittivity of the material from the resonance measurement. The results show the possibility of highly accurate measurement at microwave frequencies. Th... View full abstract»

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  • Antenna gain calibration on a ground reflection range

    Publication Year: 1973, Page(s):532 - 538
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    The absolute gain of wide-beam antennas may be accurately measured using the method described. Both the theoretical and practiced aspects of gain calibration on a ground reflection antenna range are presented. The measurement procedures developed were used to calibrate a log-periodic antenna at selected frequencies from 250 to 400 MHz. Measured data at 300 MHz is tabulated and error contributions ... View full abstract»

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  • On the relative response and absolute gain toward the zenith of HF field-expedient antennas--Measured with an ionospheric sounder

    Publication Year: 1973, Page(s):571 - 574
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    A technique for using a pulse-type ionospheric sounder to measure the relative response of HF antennas toward the zenith is described, and some ionospheric limitations on the technique are discussed. Example measurements are given for selected field-expedient antennas (e.g., dipoles, slant wires, and whips) in forested and cleared areas, and the short-path skywave gain over an isotropic radiator i... View full abstract»

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  • Reflectivity level of radio anechoic chambers

    Publication Year: 1973, Page(s):490 - 498
    Cited by:  Papers (41)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1080 KB)

    A comparison between the antenna-pattern comparison technique and the free-space voltage standing-wave ratio technique for evaluating the reflectivity level of radio anechoic chambers is presented. Based on an analysis of the two techniques, it is pointed out which parameters influence the measured value of the reflectivity level. The comparison is illustrated with experimental results and it is e... View full abstract»

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  • Dependence of sidelobe level on random phase error in a linear array antenna

    Publication Year: 1973, Page(s):569 - 571
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The observed sidelobe level of a linear array antenna is predicted approximately by assuming a computationally simple, uniform distribution of phase error, and the effect of this phase error is shown to mask the effect of an occasional isolated element failure. The assumed level of phase error was deduced from phase measurements in the feed network. View full abstract»

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  • Measurement of the radiation patterns of full-scale HF and VHF antennas

    Publication Year: 1973, Page(s):538 - 544
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    A system has been developed to measure the directivity patterns of full-scale antennas when located in their operational environments. The primary component of this system is an aircraft-towed multifrequency transmitter that is designed to approximate an elementary dipole antenna. An HF and a VHF version of this transmitter provide frequency coverage from 2 to 100 MHz. Techniques have been develop... View full abstract»

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  • The corrugated horn as an antenna range standard

    Publication Year: 1973, Page(s):562 - 564
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The corrugated horn discussed here is a valuable tool for use in microwave pattern ranges. It has the properties of concentrated energy in the main beam, low backlobes, high efficiency and almost monotonic amplitude, and phase radiation patterns which make the corrugated horn useful for a source antenna in a pattern range and also as a possible standard antenna for calibration purposes. A sample o... 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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Meet Our Editors

Editor-in-Chief                                                 Kwok W. Leung