JPH10145124A - Chip antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the chip antenna that has a wide frequency 6 and width and is applicable to a radio equipment sending/receiving a wide frequency range. SOLUTION: A chip antenna 10 is provided with a rectangular prism base 11, made of such major dielectric materials as barium oxide, aluminum oxide and silica, a conductor 12 that is wound in spiral in the lengthwise direction of the base 11, a resistor 13 whose one terminal connects to the conductor 12 on the surface of the vase 11, and a feeding terminal 14 that is connected to the other terminal of the resistor 13 to apply a voltage to the conductor 12. By means of such a constitution, the conductor 12 and the resistor 13 are connected in series.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip antenna, and more particularly, to a chip antenna used for radio equipment transmitting and receiving a wide range of frequencies, for example, a television, a radio, a pager, and the like.

[0002]

2. Description of the Related Art FIG. 8 is a perspective side view of a conventional chip antenna 50. FIG. The chip antenna 50 is made of a rectangular parallelepiped insulator 51 in which an insulator layer (not shown) made of an insulator powder such as alumina or steatite is laminated, and silver, silver-palladium, or the like. A conductor 52 formed in a coil shape and a magnetic material 53 made of a magnetic powder such as a ferrite powder, and formed inside the insulator 51 and the coil-shaped conductor 52.
2 are provided with external connection terminals 54a and 54b to be attached and baked to the 2 drawn ends (not shown).

[0003]

However, in the above-mentioned conventional chip antenna, for example, a resonance frequency of 1.
At 9 GHz, the bandwidth is 57.7 MHz, that is, the bandwidth is about 3% of the resonance frequency, and there is a problem that the bandwidth is very narrow.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a chip antenna which has a wide bandwidth and can be used for radio equipment which transmits and receives a wide range of frequencies. Aim.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a substrate comprising at least one of a dielectric material and a magnetic material, and at least one substrate formed on at least one of the inside and the surface of the substrate. A conductor and a power supply terminal formed on the surface of the base and connected to one end of the conductor, between the one end of the conductor and the power supply terminal,
A resistor is provided at an intermediate portion of the conductor or at the other end of the conductor.

According to the chip antenna of the present invention, since the conductor and the resistor are connected in series, the substantial Q of the chip antenna can be reduced.

[0007]

1 and 2 show a perspective perspective view and an exploded perspective view, respectively, of a first embodiment of a chip antenna according to the present invention. The chip antenna 10 is a rectangular parallelepiped base 1 mainly composed of barium oxide, aluminum oxide, and silica.
1, a conductor 12 spirally wound in the longitudinal direction of the base 11, a resistor 13 having one end connected to the conductor 12 on the surface of the base 11, and a voltage applied to the conductor 12 on the surface of the base 11. And a wiring pattern 15 for connecting the other end of the resistor 13 and the power supply terminal 14 on the surface of the base 11. With such a structure, the conductor 12 and the resistor 13 are connected in series.

The base 11 is formed by laminating rectangular sheet layers 16a to 16c made of a dielectric material (relative permittivity: about 6.0) containing barium oxide, aluminum oxide and silica as main components. Of these, conductive patterns 17a to 17g made of copper or a copper alloy and having a substantially L-shaped or substantially linear shape are provided on the surfaces of the sheet layers 16a and 16b by printing, vapor deposition, bonding, or plating.
The surface of the sheet layer 16c is formed of silver or silver-palladium by printing, vapor deposition, bonding, or plating, and is formed of a substantially rectangular resistor 13 and copper or a copper alloy. A wiring pattern 15 connected to the end is provided.

Further, a predetermined position of the sheet layer 16b (both ends of the conductive patterns 17d to 17f and the conductive
g), a via hole 18 is provided in the thickness direction. Also, a via hole 18 is provided at a predetermined position (one end of the resistor 13) of the sheet layer 17c in the thickness direction.

Then, the sheet layers 16a to 16c are laminated and sintered, and the conductive patterns 17a to 17h are connected by via holes 18, so that the winding section has a rectangular shape inside the base 11, and Then, the conductor 12 wound spirally is formed. At this time, one end of the conductor 12 (one end of the conductive pattern 17 d) is connected to one end of the resistor 13 through the via hole 18, and the other end of the conductor 12 (the other end of the conductive pattern 17 g) is a free end inside the base 11. 19
To form The other end of the resistor 13 is connected to the power supply terminal 14 on the surface of the base 11.

FIGS. 3 and 4 show the chip antenna 1 of FIG.
0 shows a perspective view of a modification of FIG. The chip antenna 10a shown in FIG. 3 includes a rectangular parallelepiped base 11a, a conductor 12a spirally wound in the longitudinal direction of the base 11a along the surface of the base 11a, and a conductor 12a at one end on the surface of the base 11a.
A terminal 13a for applying a voltage to the conductor 12a on the surface of the base 11a, and the other end of the resistor 13a and a power supply terminal 14 on the surface of the base 11a.
a and a wiring pattern 15a for connecting to the wiring pattern 15a.
At this time, one end of the conductor 12a is connected to one end of the resistor 13a on the surface of the base 11a. The other end of the conductor 12a forms a free end 19a on the surface of the base 11a. Further, the other end of the resistor 13a is connected to the power supply terminal 14a via the wiring pattern 15a on the surface of the base 11a. In this case, since the conductor can be easily formed spirally on the surface of the base by screen printing or the like, the manufacturing process of the antenna body can be simplified.

A chip antenna 10b shown in FIG. 4 includes a rectangular parallelepiped base 11b, a conductor 12b formed in a meandering shape on the surface of the base 11b, and a resistor 13b having one end connected to the conductor 12b on the surface of the base 11b. And a power supply terminal 14 for applying a voltage to the conductor 12b on the surface of the base 11b.
and a wiring pattern 15b for connecting the other end of the resistor 13b and the power supply terminal 14b to the surface of the base 11b. At this time, one end of the conductor 12b is connected to one end of the resistor 13b on the surface of the base 11b. The conductor 12
The other end of b forms a free end 19b on the surface of the base 11b. Further, the other end of the resistor 13b is connected to the power supply terminal 14b via a wiring pattern 15b on the surface of the base 11b. In this case, since the meandering conductor is formed only on one main surface of the base, the height of the base can be reduced, and accordingly the height of the antenna body can be reduced. The meandering conductor may be formed inside the base.

Next, the chip antenna 10 shown in FIG.
(Resistance value 33Ω) and the conventional chip antenna 50 (FIG. 8)
The insertion loss was examined. The result is shown in FIG. In addition,
In FIG. 5, the solid line indicates the chip antenna 10 (the present invention).
And the broken line indicates the chip antenna 50 (conventional example).

FIG. 5 shows that the bandwidth is 57.7 MHz by connecting a resistor having a resistance value of 33 Ω in series to the conductor.
It can be seen that it is possible to increase z from 136.6 MHz, that is, to increase the bandwidth by about 2.37 times.

FIG. 6 is a perspective view showing a chip antenna according to a second embodiment of the present invention. Chip antenna 20
A conductor 22 spirally wound in the longitudinal direction of the base 21 inside a rectangular parallelepiped base 21 mainly composed of barium oxide, aluminum oxide, and silica; and one end of the conductor 22 on the surface of the base 21. A power supply terminal 23 for applying a voltage to the conductor 22 connected to the conductor 22 and a resistor 24 connected to an intermediate portion of the conductor 22 on the surface of the base 21. The other end of the conductor 22 is connected to the free end 2 inside the base 21.
5 is formed. The conductor 22 and the resistor 24 are connected via a via hole 26. With the above structure,
The conductor 22 and the resistor 24 are connected in series.

FIG. 7 is a perspective view showing a third embodiment of the chip antenna according to the present invention. Chip antenna 30
A conductor 32 spirally wound in the longitudinal direction of the base 31 inside a rectangular parallelepiped base 31 mainly composed of barium oxide, aluminum oxide and silica; and one end of the conductor 32 on the surface of the base 31. And a resistor 34 connected to the other end of the conductor 32 on the surface of the base 31. And
The conductor 32 and the resistor 34 are connected via a via hole 35. With the above structure, the conductor 32 and the resistor 34 are connected in series.

According to the above-described chip antennas of the first to third embodiments, since the conductor and the resistor are connected in series, the substantial Q of the chip antenna can be reduced, so that the bandwidth is widened. be able to. Therefore,
It can be used for wireless devices that transmit and receive a wide range of frequencies.

Further, since a resistor is formed on the base of the chip antenna and the chip antenna and the resistor are integrated,
It is possible to reduce the size. Therefore, it can be attached to a portable wireless device that transmits and receives a wide range of frequencies.

Further, with the miniaturization of a chip antenna having a wide band, the chip antenna can be housed inside the housing of a wireless device that transmits and receives a wide range of frequencies, so that a protrusion from the wireless device can be eliminated. it can.

In the above-described first to third embodiments, the case where the base is made of a dielectric material containing barium oxide, aluminum oxide, and silica as a main component has been described. The material is not limited, and a dielectric material containing titanium oxide or neodymium oxide as a main component, a magnetic material containing nickel, cobalt, or iron as a main component, or a combination of a dielectric material and a magnetic material may be used.

Further, the case where the number of conductors is one has been described, but a plurality of conductors may be provided, each of which is arranged in parallel. In this case, it is possible to have a plurality of resonance frequencies according to the number of conductors, and it is possible to cope with multiband with one antenna.

Further, the case where the resistor is provided on the surface of the base has been described, but the resistor may be provided inside the base. In this case, at the same time or separately from the conductor pattern constituting the conductor is formed on the sheet layer by sheet printing,
By laminating the sheet layers, they can be provided inside the base.

[0023]

According to the chip antenna of the present invention, since the Q of the chip antenna can be substantially reduced by connecting the conductor and the resistor in series, the bandwidth can be widened. Therefore, it can be used for a wireless device that transmits and receives a wide range of frequencies.

Also, since a resistor is formed on the base of the chip antenna and the chip antenna and the resistor are integrated,
It is possible to reduce the size. Therefore, it can be attached to a portable wireless device that transmits and receives a wide range of frequencies.

Further, with the miniaturization of a chip antenna having a wide band, the chip antenna can be housed inside the housing of a wireless device that transmits and receives a wide range of frequencies, so that a protrusion from the wireless device can be eliminated. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first 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 perspective view showing a modification of the chip antenna of FIG. 1;

FIG. 4 is a perspective view showing another modification of the chip antenna of FIG. 1;

FIG. 5 is a diagram illustrating insertion loss of the chip antenna of FIG. 1;

FIG. 6 is a perspective view showing a chip antenna according to a second embodiment of the present invention;

FIG. 7 is a perspective view of a chip antenna according to a third embodiment of the present invention.

FIG. 8 is a perspective side view showing a conventional chip antenna.

[Explanation of symbols]

 10, 20, 30 Chip antenna 11, 21, 31 Base 12, 22, 32 Conductor 13, 24, 34 Resistance 14, 23, 33 Feeding terminal

Claims (1)

[Claims] 1. A base made of at least one of a dielectric material and a magnetic material, at least one conductor formed on at least one of the inside and the surface of the base, and one end of the conductor formed on a surface of the base. A chip antenna comprising: a power supply terminal to be connected; and a resistor provided between one end of the conductor and the power supply terminal, an intermediate portion of the conductor, or the other end of the conductor.