Claims
- 1. An antenna device, comprising:an antenna unit including: a basic body comprising at least one of dielectric ceramic and magnetic ceramic, at least one conductor disposed at least one of inside and on a surface of the basic body, and a feeding electrode for applying a voltage to the conductor, disposed on the surface of the basic body; a mounting board on which said antenna unit is mounted; a ground part in association with said mounting board and adapted to resonate with said antenna unit; and a length in the polarization direction of a radio wave of said ground part being about λ/4 or more, where λ is a wavelength of the radio wave, said basic body comprising; a first generally planar sheet having a plurality of spaced, first conductors formed on one major surface thereof, a second generally planar sheet having a plurality of spaced second conductors formed on one major surface thereof; said first and second generally planar sheets being laminated together to form an elongated structure wherein respective pairs of said first and second conductors are coupled to one another to form respective spiral loops of a spiral antenna so that a central axis of said spiral antenna extends generally parallel to a longitudinal direction of said elongated structure; each of said sheets being formed of a material having a relative permeability of 1<μ<7 or a dielectric constant ε of 1<ε<130; and a feeding terminal coupled to one end of said spiral antenna so that said antenna unit forms a mono-pole antenna, said antenna unit and ground part together functioning as a dipole antenna.
- 2. The antenna device of claim 1, further comprising at least one generally planar additional sheet located between the first and second generally planar sheets, and wherein respective pairs of said first and second conductors are coupled together through said at least one generally planar additional sheet.
- 3. The antenna device of claim 2, wherein the at least one generally planar additional sheet has conductive through holes for coupling said first and second conductors.
- 4. The antenna device of claim 1, wherein said ground part comprises at least one of a ground electrode disposed on said mounting board and a ground portion of a high-frequency circuit portion mounted on said mounting board together with said antenna unit.
- 5. An antenna device, comprising:an antenna unit including: a basic body comprising at least one of dielectric ceramic and magnetic ceramic, at least one conductor disposed at least one of inside and on a surface of the basic body, and a feeding electrode for applying a voltage to the conductor, disposed on the surface of the basic body; a mounting board on which said antenna unit is mounted; a ground part in association with said mounting board and adapted to resonate with said antenna unit; and a length in the polarization direction of a radio wave of said ground part being about λ/4 or more, where λ is a wavelength of the radio wave, said basic body comprising; a first generally planar sheet having a plurality of spaced, first conductors formed on one major surface thereof, a second generally planar sheet having a plurality of spaced second conductors formed on one major surface thereof; at least one generally planar additional sheet located between the first and second generally planar sheets; said first and second generally planar sheets being laminated together to form an elongated structure wherein respective pairs of said first and second conductors are coupled together through said at least one generally planar additional sheet to form respective spiral loops of a spiral antenna so that a central axis of said spiral antenna extends generally parallel to a longitudinal direction of said elongated structure; each of said sheets being formed of a material having a relative permeability of 1<μ<7; and a feeding terminal coupled to one end of said spiral antenna so that said antenna unit forms a mono-pole antenna, said antenna unit and ground part together functioning as a dipole antenna.
- 6. The antenna device of claim 5, wherein the at least one generally planar additional sheet has conductive through holes for coupling said first and second conductors.
- 7. The antenna device of claim 5, wherein said ground part comprises at least one of a ground electrode disposed on said mounting board and a ground portion of a high-frequency circuit portion mounted on said mounting board together with said antenna unit.
Priority Claims (2)
Number |
Date |
Country |
Kind |
7-201153 |
Aug 1995 |
JP |
|
10-883 |
Jan 1998 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of U.S. application Ser. No. 09/225,600, filed Jan. 6, 1999 and a continuation-in-part of U.S. application Ser. No. 08/693,447 filed Aug. 7, 1996, now U.S. Pat. No. 6,052,096 the disclosures of which are hereby incorporated by reference in their entireties.
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Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
09/225600 |
Jan 1999 |
US |
Child |
09/525821 |
|
US |
Parent |
08/693447 |
Aug 1996 |
US |
Child |
09/225600 |
|
US |