Chip antenna, radio communications terminal and radio communications system using the same and method for production of the same

A chip antenna comprising:

• a core body formed in a cylinder shape;
• a conductor having a helical shape mounted on a surface of said core body;
• a resin protection member covering said conductor;
• and
• a terminal portion provided on said core body and connected to an end of said conductor, wherein
• a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less.

A chip antenna comprising:

• a core body formed in a cylinder shape;
• a conductor having a helical shape mounted on a surface of said core body;
• a resin tube covering said conductor as a protection member;
• and
• a terminal portion provided on said core body and connected to an end of said conductor, wherein
• a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less.

A chip antenna comprising:

• a core body formed in a cylinder shape, said core body having a groove formed therein, wherein a line connecting a start point of the groove and an end point of the groove is virtually in parallel with center line of said core body;
• a conductor having a helical shape mounted on a surface of said core body;
• a terminal portion provided on said core body and connected to an end of said conductor, wherein
• a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less.

A chip antenna comprising:

• a core body formed in a cylinder shape;
• a conductor having a helical shape mounted on a surface of said core body;
• a terminal portion provided on said core body and connected to an end of said conductor, said terminal portion being a conductive film;
• and
• at least one of a protection layer protecting said terminal portion and a bonding layer facilitating electrical connection between said terminal portion and a pattern on a circuit board is provided at said terminal portion, wherein
• a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less.

A chip antenna comprising:

• a core body formed in a cylinder shape;
• a conductor having a helical shape mounted on a surface of said core body;
• a terminal portion provided on entire peripheral surfaces of both end portions of said core body and connected with an end of said conductor, wherein
• a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less.

A chip antenna comprising:

• a core body formed in a cylinder shape, wherein a cross-sectional size of both end portions of said core body is larger than a cross-sectional size of a center portion of said core body in a stepped manner;
• a conductor having a helical shape mounted on a surface of a center portion of said core body;
• and
• a terminal portion provided on both of said end portions of said core body and connected with an end of said conductor, wherein
• a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less.

A chip antenna comprising:

• a core body formed in a cylinder shape;
• a conductor having a helical shape mounted on a surface of said core body;
• and
• a terminal portion provided on said core body and connected with an end of said conductor, said terminal portion comprising a pair of conductive caps located on both end portions of said core body, wherein
• a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less.

A chip antenna comprising:

• a core body formed in a cylinder shape;
• a conductor having a helical shape mounted on a surface of said core body, said conductor being a conductive film;
• a terminal portion provided on said core body and connected to an end of said conductor;
• and
• a bonding film provided as a layer over said terminal portion and said conductive film, wherein
• a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less.

A chip antenna comprising:

• a core body formed in a cylinder shape;
• a conductor having a helical shape mounted on a surface of said core body, wherein a position of a center in a longitudinal direction of said conductor is located within a range of 0.3×L from both end faces of said core body, where L represents a total length of said chip antenna;
• and
• a terminal portion provided on said core body and connected with an end of said conductor, wherein
• a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less.

A chip antenna comprising:

• a core body formed in a cylinder shape;
• a conductor having a helical shape mounted on a surface of said core body, wherein a position of a center in a longitudinal direction of said conductor is located within a range of 0.3×L to 0.7×L from both end faces of said core body, where L represents a total length of said chip antenna;
• and
• a terminal portion provided on said core body and connected with an end of said conductor, wherein
• a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less.

A wireless communication system comprising:

• a wireless terminal including a chip antenna, said chip antenna comprising a core body formed in a cylinder shape, a conductor having a helical shape mounted on a surface of said core body, a terminal portion provided on entire peripheral surfaces of both end portions of said core body and connected to an end of said conductor, wherein a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less;
• a mobile terminal being operable to transmit and receive data to and from said wireless terminal;
• a base station being operable to transmit and receive a data or voice signal to and from said wireless terminal;
• and
• a server connected to said base station via a communication line.

A method for manufacturing a chip antenna comprising a core body formed in a cylinder shape, a conductive film formed on a surface of the core body, a groove cut into a peripheral surface of the core body in a helical shape to form the conductive film into a helical shape, and a protection member protecting the conductive film, said method comprising:

• producing the core body from a plate-shaped insulating material by pressing or extrusion processing;
• after said producing of the core body, cutting the core body such that a cross-section in a longitudinal direction of a center portion of the core body is made smaller than that of both end portions of the core body in a stepped manner;
• after said cutting of the core body, producing the conductive film;
• after said producing of the conductive film, cutting a groove having a helical shape in a surface of the center portion of the core body;
• and
• after said cutting of the groove, producing the protection member on a surface of the core body.

A chip antenna comprising:

• a core body formed in a cylinder shape;
• a conductor having a helical shape mounted on a surface of said core body, wherein said conductor is a conductive film;
• a buffer layer provided between said conductive film and said core body, a terminal portion provided on said core body and connected to an end of said conductor;
• a bonding film provided in a layer over said terminal portion and said conductive film, wherein
• a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less.

A wireless communication system comprising:

• a wireless terminal including a chip antenna, said chip antenna comprising a core body formed in a cylinder shape, a conductor having a helical shape mounted on a surface of said core body, wherein a position of a center in a longitudinal direction of said conductor is located within a range of 0.3×L from both end faces of said core body, where L represents a total length of said chip antenna, and a terminal portion provided on said core body and connected to an end of said conductor, wherein a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less;
• a mobile terminal being operable to transmit and receive data to and from said wireless terminal;
• a base station being operable to transmit and receive a data or voice signal to and from said wireless terminal;
• and
• a server connected to said base station via a communication line.

A wireless communication system comprising:

• a wireless terminal including a chip antenna, said chip antenna comprising a core body formed in a cylinder shape, a conductor having a helical shape mounted on a surface of said core body, wherein a position of a center in a longitudinal direction of said conductor is located within a range of 0.3×L to 0.7×L from both end faces of said core body, where L represents a total length of said chip antenna, and a terminal portion provided on said core body and connected to an end of said conductor, wherein a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less;
• a mobile terminal being operable to transmit and receive data to and from said wireless terminal;
• a base station being operable to transmit and receive a data or voice signal to and from said wireless terminal;
• and
• a server connected to said base station via a communication line.

A wireless communication system comprising:

• a wireless terminal including a chip antenna, said chip antenna comprising a core body formed in a cylinder shape, a conductor having a helical shape mounted on a surface of said core body, a resin tube covering said conductor as a protection member;
• and a terminal portion provided on said core body and connected to an end of said conductor, wherein a width of said core body is within a range of 0.5-5 mm, a depth of said core body is within a range of 0.5-5 mm, a length of said core body is within a range of 4-40 mm, an intrinsic volume resistance of said core body is 1013Ω·m or above, a relative dielectric constant of said core body is 40 or less;
• a mobile terminal being operable to transmit and receive data to and from said wireless terminal;
• a base station being operable to transmit and receive a data or voice signal to and from said wireless terminal;
• and
• a server connected to said base station via a communication line.