JP2003298453A - Wireless communication apparatus and pattern antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication apparatus capable of preventing a change in the characteristic of an antenna due to a flaw, erosion, and rust or the like, and the restriction in the manufacturing of which can be reduced to attain downsizing. <P>SOLUTION: The wireless communication apparatus is configured to include: a printed circuit board 100 of a stacked structure provided with a plurality of dielectric layers 21, 22, and 23; an antenna conductor 10 formed to the inner layer; a feeding conductor coupled to the antenna conductor 10; and a communication circuit 40 connected to the antenna conductor 10 via the feeding conductor. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pattern antenna formed on a printed board by photoetching and a wireless communication device having the pattern antenna.

[0002]

2. Description of the Related Art In recent years, there has been provided a wireless communication device having an antenna pattern formed on a printed board by photoetching. FIG. 6 shows a conventional wireless communication device 6
10 shows the main part. In FIG. 6, a printed circuit board 600
The linear inverted F-shaped antenna pattern 611 is formed on the surface layer of, and the communication circuit 40 is connected to the antenna pattern 611 on the surface layer of the printed circuit board 600.

[0003]

However, such a conventional wireless communication device 610 has the antenna pattern 6
Since 11 is easily scratched, corroded, and easily rusted, there is a problem that the characteristics of the antenna are changed. Further, there is a problem in that cost is increased when gold plating or other additional processing is performed in order to prevent changes in antenna characteristics.

Further, for example, when the components are automatically mounted on the printed circuit board 600, it is necessary to keep a distance from the end of the printed circuit board 600 in order to put the end of the printed circuit board 600 on the rail (shown as'd 'in FIG. 6). ), The range of arranging components on the surface layer of the printed circuit board 600 is limited, or the range of arranging the member for holding the printed circuit board 600 in the housing is limited, and manufacturing is restricted, and miniaturization is achieved. There was a problem that could not be achieved.

The present invention has been made to solve such a problem, and provides a wireless communication device and a pattern antenna which can prevent the characteristics of the antenna from changing and can be downsized. is there.

[0006]

A wireless communication device of the present invention is formed on a printed circuit board having a laminated structure having a plurality of dielectric layers and a plurality of conductor layers, and is formed on an inner layer of the plurality of conductor layers. The antenna conductor, the feeding conductor coupled to the antenna conductor, and the communication circuit connected to the antenna conductor via the feeding conductor.

With this structure, it is possible to prevent the characteristics of the antenna from changing due to scratches, corrosion, rust, etc., and it is possible to reduce the size of the device by reducing restrictions in manufacturing.

A radio communication device of the present invention is formed on a printed circuit board having a laminated structure having a plurality of dielectric layers and a plurality of conductor layers, and an antenna conductor formed on an inner layer of the plurality of conductor layers, A feed conductor coupled to the antenna conductor in the inner layer and reaching an outer layer, a plurality of lands formed in the outer layer, at least one of which is coupled to the feed conductor, and a communication circuit connected to at least one of the lands, A compensating circuit connected to the land and compensating for impedance is provided.

With this configuration, the characteristics of the antenna can be easily adjusted even after the printed circuit board is created and the communication circuit is mounted on the printed circuit board.

The patterned antenna of the present invention is a printed circuit board having a laminated structure having a plurality of dielectric layers and a plurality of conductor layers, in which an antenna conductor is formed in an inner layer of the plurality of conductor layers. Have

With this configuration, it is possible to prevent the characteristics of the antenna from changing due to scratches, corrosion, rust, etc., and it is possible to reduce the size of the device by reducing restrictions in manufacturing.

The patterned antenna of the present invention comprises a feed conductor which is coupled to the antenna conductor in the inner layer and reaches the outer layer,
At least one is formed in the outer layer and has a plurality of lands coupled to the power supply conductor.

With this configuration, the characteristics of the antenna can be easily adjusted even after the printed circuit board is created and the communication circuit is mounted on the printed circuit board.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 shows a perspective view of a main part of a wireless communication apparatus according to a first embodiment of the present invention, and FIG. 2 shows a sectional view thereof. In FIG. 1, the wireless communication device 110 is formed on a printed circuit board 100 having a laminated structure. As shown in FIG. 2, the printed circuit board 100 includes a plurality of dielectric layers (first glass epoxy layer 21, second glass epoxy layer 22, third glass epoxy layer 23) and a plurality of conductor layers ( First outer layer 11, first inner layer 12, second
Inner layer 13 and a second outer layer 14).

On the first inner layer 12, an antenna pattern 10 (antenna conductor) that radiates and enters a radio wave is formed. The antenna pattern 10 shown in FIG. 1 shows an example in which a linear inverted F-shaped antenna pattern is formed. A communication circuit 40 that performs wireless communication using the antenna pattern 10 is formed on the first outer layer 11.

A plurality of lands (first land 31, second land 32, third land 33, fourth land 34) are formed on the first outer layer 11. As shown in FIG. 2, the first land 31 is connected to the antenna pattern 10 via the through hole 16 (feeding conductor). Second
The land 32 of is connected to the communication circuit 40. Further, a compensation circuit for compensating for impedance is connected to the plurality of lands 31, 32, 33, 34.

The wireless communication device 110 shown in FIG.
The compensation circuit shows a state in which it is not connected, for example, the first land 3
After the antenna characteristics are tested by directly connecting the first land 32 and the second land 32, for example, as shown in FIG.
A compensation circuit is connected to the land, as shown in FIG. Figure 3
(A) shows an example in which an inductance element 51 and a capacitance element 52 are connected as a compensation circuit. Figure 3
An equivalent circuit of (a) is shown in FIG.

As described above, the wireless communication circuit 110 of this embodiment is formed on the printed circuit board 100 having a laminated structure, and the antenna pattern 10 formed on the inner layer 12 of the plurality of conductor layers and the antenna pattern 10. Since the through hole 16 that is coupled and the communication circuit 40 that is connected to the antenna pattern 10 through the through hole 16 are provided,
It is possible to prevent changes in the antenna characteristics due to scratches, corrosion, rust, etc., and reduce the manufacturing restrictions and downsize the device. Further, the antenna pattern 10 formed on the inner layer 12 of the printed circuit board can shorten the wavelength due to the dielectric constants of the upper and lower glass epoxy layers, and makes the length of the antenna pattern shorter than that of the conventional antenna pattern. be able to.

Further, the wireless communication circuit 110 of the present embodiment
A plurality of lands 31, 32, 33, 34 are formed in the outer layer 11, the first lands 31 are coupled to the through holes 16, the communication circuit 40 is connected to the second lands 32, and a plurality of lands 31 are further formed. , 32, 33, 34 are connected to the compensating circuit for compensating the impedance, the characteristics of the antenna can be easily adjusted even after the printed circuit board is formed and the communication circuit is mounted on the printed circuit board.

Although an example in which the compensating circuit is composed of the inductance element 51 and the capacitance element 52 has been described with reference to FIG. 3, the resistance element may be connected to the land, for example. Also, a parallel circuit of an inductance element and a capacitance element may be connected to the land. Further, when it is determined that the compensation is not necessary based on the test result of the antenna characteristics, the inductance element 51 and the capacitance element 5
The first land 31 and the second land 32 may be directly connected without connecting 2 to the land.

Further, as shown in FIG. 1, an example in which the first land 31 and the second land are not connected at the time of photoetching has been described, but the first land 31 and the second land at the time of photoetching. 32 is connected in advance,
When the need for compensation arises, the connection between the first land 31 and the second land 32 may be disconnected, and the compensation circuit may be connected to the land.

(Second Embodiment) FIG. 4 is a perspective view of a main part of a wireless communication device according to a second embodiment of the present invention. In FIG. 4, the wireless communication device 41 of the present embodiment
0 indicates the communication circuit 4 in the outer layer of the printed circuit board 400.
0 is arranged above the antenna pattern 10. In addition,
The land for connecting the compensation circuit is not particularly formed. For compensation of impedance and the like, if unnecessary, the antenna pattern 10 and the communication circuit 40 are directly connected via a through hole. If necessary, the communication circuit 40
A compensation circuit may be formed in advance inside. The other constituents are the same as the constituents of the first embodiment, and detailed description thereof will be omitted.

(Third Embodiment) FIG. 5 shows a perspective view of a main part of a wireless communication apparatus according to a third embodiment of the present invention. In FIG. 5, the wireless communication device 51 according to the present embodiment
Reference numeral 0 includes a plurality of ribs 60 (holding members) that hold the printed circuit board 100 in a housing (upper housing 71, lower housing 72). The rib 60 press-contacts the printed circuit board 100 at the first glass epoxy layer 21 and the third glass epoxy layer 23 located above and below the antenna pattern 10 so as to sandwich the antenna pattern 10.
The other constituents are the same as the constituents of the first embodiment, and detailed description thereof will be omitted.

Although the example in which the printed circuit board is pressed against the rib 60 has been described, a locking member for locking the printed circuit board in the housing may be used.

In the first to third embodiments, an example in which the dielectric layer has three layers and the conductive layer has four layers has been described, but the present invention is not limited to this. , Any number of layers may be used. Although the example in which the through hole 16 is formed so as to reach the first outer layer 11 (surface layer) has been described, the through hole 16 is formed in the second outer layer 14.
The land and the communication circuit may be formed to reach the (rear surface layer), and the land and the communication circuit may be formed on the second outer layer 14 (rear surface layer).

Although the land is formed at the time of photo-etching the printed circuit board and the compensating circuit is mounted on the printed circuit board after the photo-etching, the present invention is not limited to this. A compensating circuit composed of elements or the like may be formed in advance on a printed circuit board, and a necessary element may be selected and connected depending on a test result of antenna characteristics.

Further, although the example in which the antenna pattern is the linear inverted F type has been described, the linear L type and other antenna patterns can be implemented without departing from the gist of the present invention.

[0029]

Industrial Applicability The present invention provides a radio communication device and a pattern antenna, which have an excellent effect that the characteristics of the antenna can be prevented from changing and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a wireless communication device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main part of the wireless communication device according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a compensation circuit in the wireless communication device according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing a main part of a wireless communication device according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a main part of a wireless communication device according to a third embodiment of the present invention.

FIG. 6 is a perspective view showing a main part of a conventional wireless communication device.

[Explanation of symbols]

10 Antenna pattern (antenna conductor) 11, 12, 13, 14 Conductor layer 16 through hole (feeding conductor) 21, 22, 23 Glass epoxy layer (dielectric layer) 31, 32, 33, 34 land 40 communication circuit 51, 52 Compensation circuit 60 holding member 71, 72 housing 100, 400 printed circuit board

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5J046 AA01 AA05 AA07 AA13 AB06                       PA07                 5J047 AA01 AA05 AA07 AA13 AB06                       FD01                 5K011 AA06 AA16 DA02 KA13                 5K062 AB05 AC01 AE03

Claims (4)

[Claims] 1. An antenna conductor formed on a laminated printed circuit board having a plurality of dielectric layers and a plurality of conductor layers, the antenna conductor being formed on an inner layer of the plurality of conductor layers, and being coupled to the antenna conductor. A wireless communication device comprising: a power feeding conductor; and a communication circuit connected to the antenna conductor via the power feeding conductor. 2. An antenna conductor formed on a printed circuit board having a laminated structure having a plurality of dielectric layers and a plurality of conductor layers and formed on an inner layer of the plurality of conductor layers, and the antenna conductor on the inner layer. A feed conductor coupled to the outer layer and reaching the outer layer,
A plurality of lands formed in the outer layer, at least one of which is coupled to the power supply conductor; a communication circuit connected to at least one of the lands; and a compensation circuit connected to the lands and compensating for impedance. A wireless communication device. 3. A printed circuit board having a laminated structure having a plurality of dielectric layers and a plurality of conductor layers, wherein an antenna conductor is formed in an inner layer of the plurality of conductor layers. . 4. A power supply conductor that is coupled to the antenna conductor in the inner layer and reaches an outer layer, and a plurality of lands that are formed in the outer layer and at least one of which is coupled to the power supply conductor. The pattern antenna according to item 3.