http://iet.metastore.ingenta.com
1887

Variations of characteristic impedance along short coaxial cables

Variations of characteristic impedance along short coaxial cables

For access to this article, please select a purchase option:

Buy article PDF
$19.95
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
Proceedings of the IEE - Part C: Monographs — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

A method is described for determining the local characteristic impedance at any point on a high-frequency coaxial cable. Measurements are made of the deviations from a harmonic series of the resonant frequencies of a short length of open or short-circuited cable. It is shown how these deviations can be used to calculate the coefficients of Fourier series describing the impedance variations along the length. Since the measurements are performed at microwave frequencies, the resolution of the impedance changes is considerably better than for lower-frequency methods.Measurements on an artificially discontinuous cable have allowed the experimental accuracy of the method to be determined, and close agreement has been obtained between the experimentally predicted and the actual impedance changes.Results from short cable samples indicate that the local variations of characteristic impedance are largely due to changes in the diameter over the dielectric filling.

References

    1. 1)
      • M. Didlaukis , H. Kaden . Die inneren Ungleichmässigkeiten von koaxialen Breitbandkabeln. Elektrische Nachrichten-Technik
    2. 2)
      • P. Merz , W. Pfleger . Irregularities in Broad-Band Wire Transmission Circuits. Bell System Technical Journal
    3. 3)
      • L.N. Brillouin . Irregularities in Telephone and Television Coaxial Cables. Electrical Communication
    4. 4)
      • Clarke, W.W.H., Hinchliffe, J.D.S.: `The Evaluation of Cable Irregularities at Very High Frequencies', Monograph No. 75 R, Proceedings I.E.E., September 1953, 101, p. 55, Part IV.
    5. 5)
      • Rosen, A.: `The “Unit” Treatment of Impedance Irregularities and its Application to Long Lines', Monograph No. 98, Proceedings I.E.E., May 1954, 101, p. 271, Part IV.
    6. 6)
      • L. Parcé . Paires concentrique pour hautes fréquences. Annales des Postes, Téléegraphes et Téléphones
    7. 7)
      • M. Cotte . La détermination des écarts d'impédance locale dans un câble et de la function de correlation de ces écarts. Bulletin de la Société Française des Électriciens
    8. 8)
      • M. Cotte . Éitude d'une longueur de fabrication de câble par des mesures d'impédance terminale. Câbles et Transmission
    9. 9)
      • H. Kaden . Über ein Verfahren zer Messung von Breitband-kabeln. Telegraph und Fernsprechtechnik
    10. 10)
      • Roberts, F.F.: `A Pulse Test Set for the Measurement of Small Impedance Irregularities in High Frequency Cables', Paper No. 736 R, Proceedings I.E.E., January 1949, 96, p. 17, Part III.
    11. 11)
      • W.R. MacLean . The Resonator Action Theorem. Quarterly of Applied Mathematics
    12. 12)
      • Whinnery, R., Jamieson, H.W.: `Coaxial Line Discontinuities', Proceedings of the Institute of Radio Engineers, 1944, 32, p. 695.
    13. 13)
      • Jackson Willis . (1945) , High Frequency Transmission Lines.
    14. 14)
      • W.T. Blackband , D.R. Brown . The Two-Point Method of Measuring Characteristic Impedance and Attenuation of Cables at 3000Mc/s. Journal J.E.E.
http://iet.metastore.ingenta.com/content/journals/10.1049/pi-c.1958.0023
Loading

Related content

content/journals/10.1049/pi-c.1958.0023
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address