JPH0969715A - Chip antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chip antenna which has high gains and a wide band range and also can reduce its height. SOLUTION: A chip antenna 10 consists of a dielectric material containing mainly barium oxide, aluminum oxide and silica and then is spirally wound around a winding shaft C at the inside of a substrate 11 of a rectangular parallelepiped shape having a mounting surface 12. The shaft C contains a winding conductor 13 which is set orthogonal to the lengthwise direction of the substrate 11 and also parallel to the surface 12. At the same time, a winding section S that is orthogonal to the shaft C of the conductor is has a rectangular shape having its vertical size H and horizontal size W respectively. One of both ends of the conductor 13 is led out onto the surface of the substrate 11 to form a feeding terminal 19 that is connected to a feeding terminal 17 to apply the voltage to the conductor 13. The other end of the conductor 13 forms a free terminal 18 at the inside of the substrate 11.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a chip antenna, and more particularly to a chip antenna for mobile communication and a local area network (LAN).

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a conventional chip antenna 50. Reference numeral 51 is an insulator, 52 is a coil, 53 is a magnetic material, and 54a and 54b are external connection terminals. The lower surface of the insulator 51 becomes the mounting surface 511, and the winding axis of the coil 52 is perpendicular to the mounting surface 511.

Referring to FIGS. 4 (a) to 4 (f),
A conventional method of manufacturing the chip antenna 50 will be described. First, as shown in FIG. 4A, a substantially L-shaped conductive pattern 56 having an insulator layer 55, one main surface of which serves as the mounting surface 511 of the insulator 51, and the lead end S on the other main surface. Is printed on the insulating layer 55, and a magnetic material pattern 57 having a high magnetic permeability is printed on the central portion of the insulating layer 55. Then, FIG.
As shown in (b), a substantially U-shaped nonmagnetic insulator layer 58 that covers the right half of the conductive pattern 56 and the right half of the insulator layer 55 (excluding the magnetic material pattern 57 portion) is printed. Next, as shown in FIG. 4C, a substantially inverted L-shaped conductive pattern 59 is printed with one end thereof overlapping the end of the conductive pattern 56, and a magnetic pattern 60 is also formed on the magnetic pattern 57. Print.

Next, as shown in FIG. 4D, a substantially U-shaped non-magnetic insulator layer 61 is printed on the left half except for the magnetic material pattern 60. Then, FIG. 4A to FIG.
The step (d) (however, the leading end is not formed) is repeated until a predetermined number of times is reached, and when a predetermined number of windings is obtained, as shown in FIG. Is printed with one end thereof overlapping the end of the conductive pattern 59, and the other end is exposed to the end of the non-magnetic insulating layer 61 to form the lead-out end F. In this way, the open magnetic circuit type coil 52 having the lead-out ends S and F is formed by the conductive patterns 56, 59 and 62.

Finally, as shown in FIG. 4F, the insulating layer 63 is printed on the entire surface, and the stacking is completed. In this way, the insulator 51 is formed by the insulator layers 55, 58, 61 and 63, and the magnetic body 53 is formed by the magnetic patterns 57 and 6.
It is formed by 0. This laminated body is fired at a predetermined temperature and time to form an integrated sintered body, and then the external connection terminals 54a and 54 are attached to the lead-out ends S and F.
The chip antenna 50 is obtained by depositing and baking b.

In this chip antenna 50, the magnetic patterns 57 and 60 have amorphous magnetic metal (relative permeability = 10).
⁴ to 10 ⁵ ) and the inductance of the chip antenna 50 is increased to lower the resonance frequency.

[0007]

However, in the above-described conventional chip antenna, since the winding axis of the winding conductor is perpendicular to the mounting surface, the chip antenna becomes expensive as the number of windings increases. There was a point.

Further, since the line length is shorter than (wavelength of resonance frequency) / 4 of the dipole antenna, that is, (wavelength of resonance frequency) / 10, the electric volume becomes small,
There was a problem that the gain was poor.

Further, at a high frequency of 100 MHz or more, the loss of the magnetic layer becomes large and there is a problem that it cannot be used.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a chip antenna which has a high gain, a wide bandwidth, and a low profile.

[0011]

In order to solve the above-mentioned problems, the present invention comprises a base made of at least one of a dielectric material and a magnetic material and having a mounting surface, the base being formed on the surface or inside the base. A chip antenna comprising a spiral wound conductor, and a power supply terminal for applying a voltage to the wound conductor provided on the surface of the base body, wherein the winding axis of the wound conductor is It is characterized in that it is orthogonal to the longitudinal direction of the base body and parallel to the mounting surface.

According to the chip antenna of the present invention, since the winding axis of the winding conductor is orthogonal to the longitudinal direction of the rectangular parallelepiped base and is parallel to the mounting surface, the winding conductor is wound. It is possible to increase the outer circumference of the turning plane.

[0013]

1 and 2 are a perspective view and an exploded perspective view of an embodiment of a chip antenna according to the present invention. The chip antenna 10 is spirally wound inside a rectangular parallelepiped base 11, and its winding axis C is orthogonal to the longitudinal direction of the base 11 and parallel to the mounting surface 12. It is provided with a circuit conductor 13. At this time, the wound conductor 1
The shape of the winding cross section S orthogonal to the winding axis C of 3 is a rectangle having a vertical dimension of H and a horizontal dimension of W.

Here, the substrate 11 is a rectangular sheet made of ceramic such as a mixture containing barium oxide, aluminum oxide or silica as a main component, resin such as Teflon resin, or a mixture of ceramic and resin. Layer 14a
.About.14c are laminated. Of these, on the surfaces of the sheet layers 14b and 14c, linear conductive patterns 15a to 15d made of copper or a copper alloy are provided by printing, vapor deposition, bonding, or plating, and the sheet layers 14b and 14c are formed. 14 c is provided with a via hole 16 formed in the thickness direction. Then, the sheet layers 14a to 14c are stacked to form the conductive patterns 15a to 15d.
Are connected by via holes 16 to form a spirally wound conductor 13.

Then, one end of the winding conductor 13 (one end of the conductive pattern 15c) is drawn out to the surface of the base 11 and is connected to a power feeding terminal 17 for applying a voltage to the winding conductor 13 at a feeding end 19. And the other end (conductive pattern 15
One end b) forms a free end 18 inside the substrate 11.

As described above, in the above-described embodiment, since the winding axis C of the winding conductor 13 is orthogonal to the longitudinal direction of the rectangular parallelepiped base body 11, the outer circumference of the winding cross section S of the winding conductor 13 is large. (2 × (H + W)) can be increased, and when the line length is the same as the conventional one, it is possible to reduce the number of turns and the inductance component. Therefore,
Since the number of windings can be reduced, the chip antenna can be downsized. Further, since the inductance component can be reduced, when the same inductance as the conventional one is used, the line length can be increased, the gain is improved, the bandwidth is widened, and the high-frequency wave of 1 GHz or higher is used. Effective as an antenna.

Further, since the winding axis C of the winding conductor 13 is parallel to the mounting surface 12 of the rectangular parallelepiped base body 11, even if the number of windings is increased and the line length is increased, the chip antenna is lowered. The height can be changed.

The shape of the winding cross section S of the winding conductor 13 is not limited to a rectangular shape, but may be a circular shape, or a substantially track shape or a substantially semicircular shape having a linear portion at least in part. May be. In particular, when the shape of the winding cross section has a linear portion in at least a part, it is omnidirectional because it is sensitive to main polarization and cross polarization from the winding axis direction and the direction perpendicular to the winding axis. It becomes a chip antenna.

Further, the case where the substrate is formed by laminating a plurality of sheet layers has been described.
The substrate may be formed using a single block-shaped dielectric. In this case, the wound conductor in one block-shaped dielectric is formed by winding it on one block-shaped dielectric surface and then enclosing it with another dielectric.

Further, although the case where the wound conductor is formed inside the substrate has been described, the wound conductor may be formed by winding a conductor pattern on the surface of the substrate. Alternatively, a spiral groove may be provided on the surface of the base body, and a wire such as a plated wire or an enamel wire may be wound along the groove to form a wound conductor.

The position of the power supply terminal has been described as being perpendicular to the winding axis, but it is not an essential condition for carrying out the present invention.

Further, the substrate is not limited to the dielectric material, but may be a magnetic material or a combination of a dielectric material and a magnetic material.

[0023]

According to the chip antenna of the present invention, since the winding axis of the winding conductor is perpendicular to the longitudinal direction of the rectangular parallelepiped base, the outer circumference of the winding cross section of the winding conductor can be increased. When the line length is the same as the conventional one, the number of windings can be reduced and the inductance component can be reduced.

Therefore, since the number of windings can be reduced, the chip antenna can be downsized. Further, since the inductance component can be reduced, when the same inductance as the conventional one is used, the line length can be increased, the gain is improved, the bandwidth is widened, and the 1G
It is effective as an antenna for high frequencies above Hz.

Furthermore, since the winding axis of the winding conductor is parallel to the mounting surface of the rectangular parallelepiped base, the height of the chip antenna can be reduced even if the number of windings is increased and the line length is increased. It is possible.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a chip antenna according to the present invention.

FIG. 2 is an exploded perspective view of the chip antenna of FIG.

FIG. 3 is a cross-sectional view showing a conventional chip antenna.

FIG. 4 is a schematic plan view illustrating a method of manufacturing the chip antenna of FIG.

[Explanation of symbols]

 10 Chip Antenna 11 Base 12 Mounting Surface 13 Winding Conductor 17 Feed Terminal C Winding Axis S Winding Section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Asakura Inventor Kenji Ara 226-10 Tenjin, Nagaokakyo City, Kyoto Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. A base made of at least one of a dielectric material and a magnetic material, which is made of a rectangular parallelepiped having a mounting surface, a spiral wound conductor is provided on the surface of or inside the base, and the surface of the base is provided. A chip antenna provided with a feeding terminal for applying a voltage to the winding conductor, wherein the winding axis of the winding conductor is orthogonal to the longitudinal direction of the base body, and A chip antenna characterized by being parallel to each other.