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Antennas and Propagation, IEEE Transactions on

Issue 7 • Date December 1964

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Displaying Results 1 - 23 of 23
  • [Front cover and table of contents]

    Publication Year: 1964 , Page(s): 0
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    Freely Available from IEEE
  • Acknowledgement

    Publication Year: 1964 , Page(s): 809
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    Freely Available from IEEE
  • Frontispiece

    Publication Year: 1964 , Page(s): 810
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (59 KB)  

    Presented is an image of contours of radio emission from the Great Nebula in Andromeda (M31) measured with The Ohio State University 260-foot radio telescope at 1415 Mc. The radio contours are superimposed on a Perkins Observatory photograph. This galaxy is at a distance of some two million light years and is believed to be quite similar to our own galaxy. The contour interval is 0.05° Kel... View full abstract»

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  • Preface

    Publication Year: 1964 , Page(s): 811
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1964 , Page(s): c4
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    Freely Available from IEEE
  • Decametric radiation from Jupiter

    Publication Year: 1964 , Page(s): 839 - 853
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    A brief historical summary is followed by a review of current observations of Jupiter's decametric radiation. Particular attention is given to the time structure and statistical properties of the emission, and several important deficiencies in our observational knowledge are pointed out. View full abstract»

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  • Measurements of radio star and satellite scintillations at a subauroral latitude

    Publication Year: 1964 , Page(s): 812 - 822
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (936 KB)  

    Observations of two radio stars, Cygnus A and Cassiopeia A, and of two satellites, Cosmos I and Transit 4A, have yielded data on lower and upper atmospheric irregularities. The frequencies studied have included 20 Mc, 40 Mc and 54 Mc for satellite transmissions, and 30 Mc to 3000 Mc for radio star signals. The antennas used have ranged from a dipole to a 150-foot parabola. The irregularities in re... View full abstract»

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  • Theories of the origin of radio sources

    Publication Year: 1964 , Page(s): 831 - 838
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    A discussion is given of the properties of the strong nonthermal radio sources and particularly of those of extragalactic origin. These sources radiate by the synchrotron process. The properties of the galaxies associated with the sources are described. A review is then given of the various theoretical proposals which have been made to try to explain how the generation of very large fluxes of rela... View full abstract»

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  • Beam efficiency limitations of large antennas

    Publication Year: 1964 , Page(s): 918 - 923
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (728 KB)  

    The beam efficiency of an antenna may be defined as the ratio of the power radiated within the main beam to the total power radiated. The beam efficiency is derived for ideal rectangular and circular apertures, as a function of the edge-to-center amplitude ratio. Random phase errors are assumed to exist across the aperture. Various types of feeds for parabolic reflectors are also considered in rel... View full abstract»

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  • Thermal radio radiation from the moon and planets

    Publication Year: 1964 , Page(s): 902 - 913
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1552 KB)  

    Thermal radio radiation has been observed from the moon, Mercury, Venus, Mars, Jupiter, and Saturn. The most important result of the observations is the discovery that the temperature at the surface of Venus, beneath the clouds, is greater than 600\deg K. The thermal radio radiation from the moon comes from beneath the surface and gives information about the... View full abstract»

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  • Radio telescopes

    Publication Year: 1964 , Page(s): 853 - 864
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1824 KB)  

    A radio telescope is used in radio astronomy to measure the intensity of the radiation received from various parts of the sky. Such a telescope must be able both to detect and to locate faint radio sources of small angular size, and also to measure the brightness distribution across extended radio sources or over large sky areas. Ideally the telescope should be capable of making such measurements ... View full abstract»

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  • Radio-telescope antenna parameters

    Publication Year: 1964 , Page(s): 891 - 898
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (808 KB)  

    Principal antenna parameters which are useful in characterizing the electrical performance of radio-telescope antennas are defined and the relations between them are established. The application of these parameters to radio astronomical measurements is discussed. View full abstract»

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  • The structure of the galaxy from radio observations

    Publication Year: 1964 , Page(s): 954 - 963
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    The appearance of our Galaxy at radio wavelengths can be described as follows: The Milky Way stands out as a bright band of emission, at both long and short wavelengths. Above 50 cm, radio emission from the rest of the sky can also be observed. The brightness distribution is highly irregular. It can be interpreted as being due to the following sources: 1) Emission from ionized gas in the galactic ... View full abstract»

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  • Parametric amplifiers for high sensitivity receivers sensitivity receivers

    Publication Year: 1964 , Page(s): 939 - 947
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    The characteristics of parametric amplifiers, including effective input noise temperature, bandwidth, stability, and gain compression are discussed. Two specific amplifiers, a liquid nitrogen cooled L -band unit for a radio astronomy observatory, and a three-channel unit for a satellite vernier auto track systems are described, and the characteristics of these ... View full abstract»

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  • Radar investigations of the planets

    Publication Year: 1964 , Page(s): 865 - 872
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    Planetary radar astronomy's greatest handicap is the extremely feeble power content of an echo. This echo is always masked by relatively strong background noise so that special signal processing is required. The basic task is the detection and measurement of the echo power. However, when the signal strength is greater than the requirements of simple detection, it is desirable to measure the power ... View full abstract»

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  • Requirements for cosmological studies in radio astronomy

    Publication Year: 1964 , Page(s): 948 - 954
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    Two types of world models and their main properties are discussed briefly: the steady-state model and the simplest relativistic models. In some world models there is a horizon which principally limits any observation within a certain distance. The question investigated is what requirements must be met by observation (and theory) in order to distinguish between different world models. A comparison ... View full abstract»

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  • Radio astronomy receivers

    Publication Year: 1964 , Page(s): 930 - 938
    Cited by:  Papers (56)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (784 KB)  

    A general survey of the principles of radio astronomy receivers is presented. System noise temperature, the sensitivity of different receiver types, and the calibration of receivers are studied. A total-power receiver is analyzed as a basic radio telescope receiver and the results are used to obtain the performance of other receiver types such as the Dicke receiver, Graham's receiver, correlation ... View full abstract»

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  • Radio and radar astronomy and the exploration of the universe

    Publication Year: 1964 , Page(s): 898 - 901
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    The role of radio and radar astronomy in space exploration is discussed and compared with present and future techniques that use electromagnetic waves of all lengths, gravity waves, atomic particles, etc. A brief description of the universe is then given with the aid of a series of scale drawings, and the possible ranges of the different techniques are considered. The place of space probes and man... View full abstract»

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  • The detection of the OH and other molecular lines in the radio spectrum of the interstellar medium

    Publication Year: 1964 , Page(s): 822 - 831
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    The detection of the ² \Pi _{3/2}, J=3/2 \Lambda -doublet lines of O16H1at 1665.36 Mc and 1667.40 Mc has provided radio astronomy with a second spectral line for investigation and has already given rise to a number of significant results. In this paper the nature of ... View full abstract»

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  • Thermal galactic sources

    Publication Year: 1964 , Page(s): 913 - 918
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (672 KB)  

    Celestial radio sources have generally been divided into two categories: 1) thermal sources, and 2) nonthermal sources. The thermal sources are usually masses of ionized hydrogen and their radiation is due to the random interaction of the electrons and protons of the ionized gas. The major cause of ionization is the ultraviolet radiation of the hot stars. This paper describes the basic physical pr... View full abstract»

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  • Radar echoes from the sun

    Publication Year: 1964 , Page(s): 876 - 891
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    The study of the sun by radar which was begun less than five years ago should become a valuable supplement to the study, by other methods, of the sun and interplanetary space. High powered transmitters and large antennas are required to detect a solar echo. Frequencies less than 50 Mc should be optimum, primarily because of increasing coronal absorption with increasing frequency. Routine observati... View full abstract»

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  • Hectometer cosmic static

    Publication Year: 1964 , Page(s): 923 - 929
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (784 KB)  

    A review is made of radio astronomy development starting with Jansky at 15-m wavelength and progressing to 30, 60, 144, 576, and 2100 m. Electromagnetic wave propagation through the ionosphere by the O, X, Z , and Y modes including various aberrations is discussed. Methods of overcoming atmospherics are outlined. Prelim... View full abstract»

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  • Radar backscatter from the earth's ionosphere

    Publication Year: 1964 , Page(s): 872 - 876
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (512 KB)  

    The role of radar backscatter observations in ionospheric studies is outlined. The theoretical developments are described that form the basis for ground-based measurements of electron density, electron temperature, ion temperature, and ionic composition at ionospheric heights, Observations of the first three parameters have been successful. Observation of the fourth parameter, ionic composition, i... 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