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Inductance device and manufacturing method thereof

  • US 6,255,933 B1
  • Filed: 05/13/1998
  • Issued: 07/03/2001
  • Est. Priority Date: 05/14/1997
  • Status: Expired due to Fees
First Claim
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1. An inductance device designed to have an operating frequency f, comprising in combination:

  • a coil including a spiral conductive member;

    the coil having an inductive reactance at frequency f;

    a closed loop conductive member surrounding a central axis of said coil and located adjacent a predetermined portion of said coil;

    the closed loop member having a series resistance component having a value, r and an inductance component, L;

    first and second connection electrodes connected to first and second ends of said coil, the values of f, r and L being such that 2π

    f/3.15≦

    r/L≦



    f/0.32.

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