JP3111899B2 - Chip antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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. 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 is 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 method for manufacturing the conventional chip antenna 50 will be described. First, as shown in FIG. 4A, an insulator layer 55 having one main surface serving as a mounting surface 511 of the insulator 51 is formed, and a substantially L-shaped conductive pattern 56 having a lead end S on the other main surface. Is printed on the insulator layer 55, and a magnetic pattern 57 having a high magnetic permeability is printed on the central portion of the insulator layer 55. Then, FIG.
As shown in (b), a substantially U-shaped non-magnetic 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 pattern 57) is printed. Next, as shown in FIG. 4C, a substantially inverted L-shaped conductive pattern 59 is printed with one end thereof superimposed on the end of the conductive pattern 56, and a magnetic pattern 60 is also formed on the magnetic pattern 57. Print.

[0004] Next, as shown in FIG. 4 (d), a substantially inverted U-shaped nonmagnetic insulator layer 61 is printed on the left half except for the magnetic pattern 60. 4 (a) to FIG.
The step (d) (however, no drawn end is formed) is repeated until the predetermined number of turns is reached, and when the predetermined number of turns is obtained, as shown in FIG. Is printed with one end thereof superimposed on the end of the conductive pattern 59, and the other end is exposed at the end of the non-magnetic insulator layer 61 to form a lead end F. In this manner, the open magnetic path type coil 52 having the lead ends S and F is formed by the conductive patterns 56, 59 and 62.

Finally, as shown in FIG. 4 (f), an insulating layer 63 is printed on the entire surface, and the lamination is completed. Thus, 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.
0 means that it was formed. The laminated body is fired at a predetermined temperature and time to obtain an integrated sintered body, and thereafter, external connection terminals 54 a and 54
The chip antenna 50 is obtained by depositing and printing b.

The chip antenna 50 includes an amorphous magnetic metal (relative permeability = 10)
⁴ -10 ⁵⁾ using, by increasing the inductance of the chip antenna 50, and lower the resonance frequency.

[0007]

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

In addition, since the line length is as short as (resonance frequency wavelength) / 10 as compared with (resonance frequency wavelength) / 4 of the dipole antenna, the electric volume is reduced.
There was a problem that the gain was poor.

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

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a chip antenna having a high gain, a wide bandwidth, and a low profile.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a rectangular parallelepiped base made of at least one of a dielectric material and a magnetic material, and having a mounting surface. A chip antenna comprising a spirally wound conductor, and a power supply terminal for applying a voltage to the wound conductor on the surface of the base, wherein the winding axis of the wound conductor is It is characterized by being orthogonal to the longitudinal direction of the base and parallel to the mounting surface.

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

[0013]

1 and 2 show 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. The conductor 13 is provided. At this time, the winding conductor 1
The shape of the winding section S orthogonal to the winding axis C of No. 3 is a rectangle having a vertical dimension H and a horizontal dimension W.

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

One end of the winding conductor 13 (one end of the conductive pattern 15 c) is drawn out to the surface of the base 11, and is connected to a power supply terminal 17 for applying a voltage to the winding conductor 13. And the other end (the conductive pattern 15
b at one end) forms a free end 18 inside the base 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 11, the outer periphery of the winding cross section S of the winding conductor 13 is formed. (2 × (H + W)) can be increased, and when the line length is the same as the conventional one, the number of turns can be reduced and the inductance component can be reduced. Therefore,
Since the number of turns can be reduced, the size of the chip antenna is reduced. In addition, since the inductance component can be reduced, when the same inductance as that of the related art is used, the line length can be increased, the gain can be improved, the bandwidth can be widened, and the frequency for high frequencies of 1 GHz or more can be improved. It is effective as an antenna.

Furthermore, since the winding axis C of the winding conductor 13 is parallel to the mounting surface 12 of the rectangular parallelepiped base 11, even if the number of windings is increased and the line length is increased, the chip antenna has a low height. It can be tall.

The shape of the wound cross section S of the wound conductor 13 is not limited to a rectangle, but may be a circular shape, or a substantially track shape or a substantially semicircular shape having a linear portion at least partially. You may. In particular, when the shape of the winding cross section has at least a part of a straight portion, it is sensitive to main polarization and cross polarization from the winding axis direction and the vertical direction of the winding axis. It becomes a chip antenna.

Further, the case where the base is formed by laminating a plurality of sheet layers has been described.
The base may be formed using one block-shaped dielectric. In this case, the wound conductor in one block-shaped dielectric is formed by being wound around the surface of one block-shaped dielectric and then encapsulating with another dielectric.

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

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

Further, the substrate is not limited to a 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, the number of turns can be reduced, and the chip antenna is reduced in size. Further, since the inductance component can be reduced, if the same inductance as that of the related art is used, the line length can be increased, the gain is improved, the bandwidth is widened, and 1G
It is effective as an antenna for high frequency of not less than Hz.

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

[Brief description of the drawings]

FIG. 1 is a perspective view of one 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 sectional view showing a conventional chip antenna.

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

[Explanation of symbols]

 Reference Signs List 10 chip antenna 11 base 12 mounting surface 13 winding conductor 17 power supply terminal C winding axis S winding cross section

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-191130 (JP, A) JP-A-4-21522 (JP, A) JP-A-7-249931 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H01Q 1/00-1/52 H01Q 5/00-11/20

Claims (1)

(57) [Claims] 1. A cuboid body made of at least one of a dielectric material and a magnetic material and having a mounting surface, and a spirally wound conductor on or in the surface of the base, and a surface of the base, A chip antenna provided with a power supply terminal for applying a voltage to the wound conductor, wherein a winding axis of the wound conductor is orthogonal to a longitudinal direction of the base, and on the mounting surface. A chip antenna which is parallel to the chip antenna.