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Herical antenna and communication apparatus

  • US 20030179152A1
  • Filed: 03/13/2003
  • Published: 09/25/2003
  • Est. Priority Date: 03/14/2002
  • Status: Active Grant
First Claim
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1. A helical antenna comprising:

  • a base body made of a dielectric material or a magnetic material; and

    a helically-configured conductor formed at least either on a top surface of the base body or in an interior thereof, wherein, in the base body, a thickness a (mm) is kept in a range of 0.3≦

    a≦

    3 (mm);

    a length b (mm) is kept in a range of 5≦

    b≦

    20 (mm); and

    a relative dielectric constant ε

    r is kept in a range of 3≦

    ε

    r≦

    30 or a relative magnetic permeability μ

    r is kept in a range of 1≦

    μ

    r≦

    8, and also a number of winding x (turn) of the conductor is kept in a range of 3≦

    x≦

    16, and wherein a resonant frequency f (MHz) and a width w (mm) of the conductor satisfy following formulae (1) and (2), respectively;

    f=Ax+By+C(MHz)  



    (1)w=Dx+E (mm) 



    (2)where y represents a width (mm) of the base body; and

    A, B, C, D, and E each represent a constant which is determined in accordance with the thickness a, the length b, and the relative dielectric constant ε

    r or the relative magnetic permeability μ

    r of the base body.

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