Chip antenna, chip antenna unit and wireless communication device using the same

A chip antenna unit having predetermined frequency characteristics, comprising:

• a mounting substrate;
• a base member which is mounted on said mounting substrate and comprising at least one of a dielectric material and a magnetic material;
• a pattern antenna which is formed on said base member;
• a feeding terminal which is formed on a surface of said base member and which is connected to said pattern antenna;
• a fixed terminal which is formed on a surface of said base member and which is connected to said pattern antenna;
• a fixing portion comprising a conductor and which is formed on said mounting substrate and which is connected to said fixed terminal and thereby fixes said base member on said mounting substrate;
• and
• said predetermined frequency characteristics being adjusted by changing an area of said fixing portion.

A chip antenna unit having predetermined frequency characteristics, comprising:

• a mounting substrate;
• a base member which is mounted on said mounting substrate and comprising at least one of a dielectric material and a magnetic material and which has a stacked structure including a plurality of layers;
• a plurality of pattern antennas which are formed on said plurality of layers and which have predetermined patterns, respectively, and of which at least parts of said predetermined patterns are not overlapping with each other in a stacked direction of said plurality of layers;
• a feeding terminal which is formed on a surface of said base member and which is connected to said pattern antenna;
• a fixed terminal which is formed on a surface of said base member and which is connected to said pattern antenna;
• a fixing portion comprising a conductor and which is formed on said mounting substrate and which is connected to said fixed terminal and thereby fixes said base member on said mounting substrate;
• and
• said predetermined frequency characteristics being adjusted by changing an area of said fixing portion.

A chip antenna comprising;

• a stacked base member comprising at least one of a dielectric material and a magnetic material and a stacked structure including a plurality of layers;
• a pattern antenna which is formed on at least one of the plurality of layers and which includes a first area having a rectangular shape and a second area elongating continuously from said first area;
• a slit dividing said first and said second areas of said pattern antenna, said slit elongating straight in a longitudinal direction of the stacked base member;
• and
• a feeding terminal which is formed on a surface of said stacked base member and which is connected to said pattern antenna.

A chip antenna comprising:

• a base member comprising at least one of a dielectric material and a magnetic material;
• a pattern antenna which is formed on said base member and which includes a first area having a rectangular shape and a second area elongating continuously from said first area;
• a slit formed between said first and said second areas of said pattern antenna;
• a feeding terminal which is formed on a surface of said base member and which is connected to said pattern antenna;
• and
• another pattern antenna having a shape other than that of said pattern antenna,
• wherein said base member comprises a stacked structure including a plurality of layers.

A chip antenna comprising:

• a base member comprising at least one of a dielectric material and a magnetic material,
• a pattern antenna formed on said base member;
• a fixed terminal which is formed on a surface of said base member and which is connected to said pattern antenna;
• and
• a fixing portion comprising a conductor and which is formed on a mounting substrate and which is connected to said fixed terminal and thereby fixes said base member on said mounting substrate,
• wherein a frequency characteristic of the chip antenna is adjustable by changing an area of said fixing portion.

A chip antenna comprising:

• a base member comprising at least one of a dielectric material and a magnetic material,
• a pattern antenna formed on said base member;
• a fixed terminal which is formed on a surface of said base member and which is connected to said pattern antenna;
• and
• a fixing portion comprising a conductor and which is formed on a mounting substrate and which is connected to said fixed terminal and thereby fixes said base member on said mounting substrate,
• wherein said base member comprises a stacked structure including a plurality of layers.