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  • 1
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Übersicht Es gibt Übertragungsmehrleitersysteme, die mit Erdungspunkten an beiden Enden versehen sind. Auf Grund stehender Wellen treten bei solchen Systemen Resonanzerscheinungen auf, die für bestimmte enge Frequenzbereiche große Amplitudenschwankungen von Dämpfungsmaß, Phasenmaß und Wellenwiderstand aufweisen. Eine einfache Näherungsmethode hoher Genauigkeit für die Berechnung von Gütefaktor und Bandbreite des Frequenzganges der die Wellenausbreitung charakterisierenden Parameter wird ausführlich behandelt.
    Notes: Contents Transmission line systems exist with grounding points at both the sending and receiving ends; due to standing wave phenomena the transmission performance of such systems is critically affected in the neighbourhood of certain resonant frequencies — attenuation, phase constant and characteristic impedance showing large amplitude variations in a relatively small frequency range. In this paper a simple accurate method to estimate the quality factor and the bandwidth of the resonant curves describing the frequency behaviour of the transmission line propagation parameters is presented.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Subsurface sensing technologies and applications 1 (2000), S. 321-336 
    ISSN: 1573-9317
    Keywords: wave propagation ; transmission lines ; skin-effect ; conductivity ; ground sensing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Abstract A circular ring placed parallel above the ground surface is analyzed. The analysis, based on transmission-line modeling, shows how the structure can be utilized for ground conductivity sensing purposes. It is shown that, once the operating frequency is tuned to a half wavelength resonance, the information on the amplitude ratio of two voltages (or two currents) measured at two diametrically opposite positions in the ring is sufficient for the computation of the ground conductivity. The theory developed is illustrated with an application example.
    Type of Medium: Electronic Resource
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