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Noise rejection device and cellular phone including the noise rejection device

  • US 7,358,843 B2
  • Filed: 09/29/2005
  • Issued: 04/15/2008
  • Est. Priority Date: 09/30/2004
  • Status: Expired due to Fees
First Claim
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1. A noise rejection device comprising:

  • a core comprising a first magnetic insulating material having a resonant frequency of permeability equal to or higher than 100 MHz;

    a resistance film formed on an outer peripheral face of the core from one end to the other end in an axial direction of the outer peripheral face;

    a spiral line segment and a corresponding spiral sulcus, each having a predetermined number of circumferences formed in the resistance film in an axial direction of the resistance film;

    an oxide film formed over a surface of at least a shoulder portion extending from a side to an upper surface of lines constituting the spiral line segment;

    an armor comprising a second magnetic insulating material having a dielectric constant smaller than that of the first magnetic insulating material, filling the spiral sulcus in the central part in the axial direction of the resistance film and covering a surface of the lines constituting the spiral line segment; and

    a pair of external electrodes formed in portions at both ends in the axial direction of the resistance film so as to sandwich the armor.

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