• DocumentCode
    1442071
  • Title

    A New Chu Formula for Q

  • Author

    Hansen, R.C. ; Collin, R.E.

  • Author_Institution
    R. C. Hansen, Inc., Tarzana, CA, USA
  • Volume
    51
  • Issue
    5
  • fYear
    2009
  • Firstpage
    38
  • Lastpage
    41
  • Abstract
    The Chu fundamental limitation on Q for electrically small antennas is well known and widely used. However, Chu did not include energy stored inside the hypothetical enveloping sphere. Exact calculation of total stored energy by Thal gives a new Q, which should better match well-designed electrically small antennas. The TM- and TE-mode Q formulas are derived, and a simple approximate form for the lowest-order TM mode is presented.
  • Keywords
    antenna theory; Chu formula; TE-mode Q formulas; TM-mode Q formulas; electrically small antennas; hypothetical enveloping sphere; Antenna theory; Antennas and propagation; Bandwidth; Dipole antennas; Equations; Impedance; Milling machines; Resonance; Wire; Cgu Q; Electrically small antennas; antenna bandwidth; antenna theory; fundamental limitations;
  • fLanguage
    English
  • Journal_Title
    Antennas and Propagation Magazine, IEEE
  • Publisher
    ieee
  • ISSN
    1045-9243
  • Type

    jour

  • DOI
    10.1109/MAP.2009.5432037
  • Filename
    5432037
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1442071