IEEE Transactions on Antennas and Propagation

Issue 4 • 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
  • Accurate measurement of antenna gain and polarization at reduced distances by an extrapolation technique

    Publication Year: 1973, Page(s):418 - 431
    Cited by:  Papers (76)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1452 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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  • Poincaré sphere representation of partially polarized fields

    Publication Year: 1973, Page(s):474 - 478
    Cited by:  Papers (29)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (475 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 pointbar{W}representing the polarization state are shown to be simply related to the Stokes parameters. The center of the s... View full abstract»

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  • Measurement techniques for antennas in dissipative media

    Publication Year: 1973, Page(s):499 - 507
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (966 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 ofalpha/betain the range0 < alpha/beta < 1.0are described along with the apparatus for d... 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 (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (873 KB)

    To calibrate electric-field sensors at extremely low frequency (ELF) the measured terminal voltageVat a receiving antenna is compared with the Analytically predictedVfor a precisely known incident field. That incident field is generated by an electrically very short thin linear radiator. Formulas are given for the field in the immediate vicinity of such a radiator above a per... 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 (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (798 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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  • 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 (218 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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  • 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 (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (690 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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  • [Back cover]

    Publication Year: 1973, Page(s): c4
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    Freely Available from IEEE
  • Measurement of the radiation patterns of full-scale HF and VHF antennas

    Publication Year: 1973, Page(s):538 - 544
    Cited by:  Papers (9)
    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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  • Measurement of near fields of antennas and scatterers

    Publication Year: 1973, Page(s):446 - 460
    Cited by:  Papers (46)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1688 KB)

    A tutorial review of techniques used for the measurement of near-fields of antennas and scatterers, and an extensive bibliography of the readily available literature in this area, are presented. View full abstract»

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  • Electromagnetic wave absorbers and anechoic chambers through the years

    Publication Year: 1973, Page(s):484 - 490
    Cited by:  Papers (150)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (968 KB)

    A historical summary of the development of microwave absorbing materials and anechoic chambers is presented. View full abstract»

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  • Reflectivity level of radio anechoic chambers

    Publication Year: 1973, Page(s):490 - 498
    Cited by:  Papers (52)  |  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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  • The generalized multiprobe reflectometer and its application to automated transmission line measurements

    Publication Year: 1973, Page(s):550 - 554
    Cited by:  Papers (30)  |  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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  • A practical method for measuring the complex polarization ratio of arbitrary antennas

    Publication Year: 1973, Page(s):432 - 435
    Cited by:  Papers (13)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (448 KB)

    A technique for measuring the complex polarization ratio of an arbitrary antenna is presented. The technique requires the use of two antennas which are not circularly polarized but are otherwise arbitrary. Only reciprocity and linearity are assumed. Six amplitude and phase measurements are performed, two measurements for each pair of antennas. The complex polarization ratio of each antenna is then... View full abstract»

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  • Probe compensated near-field measurements on a cylinder

    Publication Year: 1973, Page(s):435 - 445
    Cited by:  Papers (147)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1056 KB)

    A new method is developed for determining the farfield pattern of an antenna from probe compensated near-field measurements over the surface of a right circular cylinder enclosing the antenna. The method is derived by first expanding both the field radiated by the antenna and the field radiated by the measurement probe, when it is used as a transmitter, into cylindrical wave expansions. The Lorent... View full abstract»

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  • Measurement of impedance transformation on practical dipoles

    Publication Year: 1973, Page(s):544 - 549
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (632 KB)

    The measured input impedance of a practical dipole antenna is shown to be related to the theoretical input impedance of a delta-gap cylindrical dipole through a bilinear transformation. In order to determine the three complex constants which specify the transformation, the impedance of a dipole in front of a ground plane is measured and compared with the theoretical impedance. The comparison is pe... View full abstract»

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

    Publication Year: 1973, Page(s):579 - 581
    Cited by:  Papers (3)  |  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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  • A comparison of time- and frequency-domain measurement techniques in antenna theory

    Publication Year: 1973, Page(s):581 - 583
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (352 KB)

    Although the impulse response and complex spectral frequency response are mathematically equivalent, their measurement for wide-band antennas and probes is quite different in the equipment required, calibration and experimental procedure, and in the character of experimental errors. The subject of this communication is an automated facility for measurement of both time- and frequency-domain antenn... View full abstract»

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  • Ground and flight test results for standard VOR and double parasitic loop counterpoise antennas

    Publication Year: 1973, Page(s):576 - 579
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (656 KB)

    Results of ground and flight tests carried out at 109 MHz to study the vertical plane radiation patterns of standard VOR and double parasitic loop counterpoise antennas above ground are discussed. The ground tests consist of the measurement of the fields produced in the quasi-radiation zone of the test antenna The flight tests consist of measuring the far field with the help of an aircraft flying ... 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 (33)
    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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  • 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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IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas.

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Meet Our Editors

Editor-in-Chief                                             Danilo Erricolo