JP2003069325A - Antenna system and electronic device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna system capable of enhancing degree of installation freedom and decreasing number of components and assembling man-hours. SOLUTION: The antenna system is provided with a case 15 made of a dielectric material and being part of an enclosure of a personal computer with a wireless communication function, a radiation electrode 17 that is formed over a prescribed range on a first major side 16 of the case 15 and fed from a high frequency circuit, and a grounding electrode 19 formed on a second major side 18 placed at a side facing the first major side 16 of the case 15 over a prescribed range, shielding unnecessary radiation from an electronic circuit built in the personal computer and set to a ground potential.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device and an electronic device using the antenna device.

[0002]

2. Description of the Related Art Today, electronic devices such as personal computers (computer devices) having a communication function are widely used in order to connect to a commercial network or to construct a LAN. As a communication form, there is a rapidly increasing need for wireless communication that can enjoy various conveniences by eliminating the need for cables such as wired communication.

FIG. 4 shows an antenna device mounted on a conventional personal computer.

In FIG. 4, a personal computer 111 is provided with a keyboard and a main body 1 in which various electronic components are stored.
12 and a display unit 113 that displays predetermined information.

Antennas 117 are built in on both sides of the display unit 113, and power is supplied to these antennas 117 from a high frequency circuit 120 provided in the main body 112 via a coaxial cable 121 at a predetermined frequency. Has become.

[0006]

However, according to such a conventional technique, the antenna is required to be installed in a personal computer that has a strong tendency toward downsizing and thinning, so that there is a large space limitation. The antenna cannot always be installed at a desired position where good characteristics can be obtained.

Further, not only various parts are required to install the antenna on the personal computer, but also man-hours are required for assembling the parts, which causes a cost increase.

[0008] Therefore, an object of the present invention is to provide an antenna device and an electronic device using the antenna device which can improve the degree of freedom of installation.

Another object of the present invention is to provide an antenna device capable of reducing the number of parts and the number of assembling steps, and an electronic device using the antenna device.

[0010]

In order to solve the above problems, an antenna device according to the present invention is composed of a dielectric,
A housing part forming a part of a housing of an electronic device having a wireless communication function, and a first part formed on a first main surface of the housing part over a predetermined area and receiving power from a high frequency circuit. Electrodes,
The housing is formed on a second main surface located on the opposite side of the first main surface over a predetermined area, and protects an electronic component incorporated in the electronic device from an external electromagnetic wave and has a ground potential. And a second electrode.

The electronic device according to the present invention is characterized by having a wireless communication function and using such an antenna device.

According to this invention, the electromagnetic shield provided on the housing of the electronic device having the wireless communication function is used as the ground potential, and this is used as the second electrode. The surface of the housing opposite to the second electrode. Since the first electrode that receives power from the high-frequency circuit is formed in the first electrode, the layoutable area of the first electrode is the entire one side of the electromagnetically shielded housing, greatly improving the flexibility of antenna installation. It is possible to let

Further, since the first electrode and the second electrode are integrated with the casing, the number of parts and the number of assembling steps can be reduced.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described more specifically with reference to the drawings. Here, in the accompanying drawings, the same reference numerals are given to the same members,
Moreover, the duplicate description is omitted. It should be noted that the embodiment of the present invention is a particularly useful embodiment for carrying out the present invention, and the present invention is not limited to the embodiment.

FIG. 1 is a perspective view showing a personal computer in which an antenna device according to an embodiment of the present invention is used, and FIG. 2 is shown in FIG.
FIG. 3 is a cutaway view showing a main part of the antenna device mounted on the personal computer, and FIG. 3 is a side view showing a personal computer in which the antenna device according to another embodiment of the present invention is used.

As shown in FIG. 1, a personal computer (electronic device) 11 of the present embodiment has a wireless communication function and has a resin housing having a thickness of about 2 to 3 mm, which is a dielectric. ing. Then, a main body 12 in which an input unit such as a keyboard is provided and various electronic components are stored, and a liquid crystal display which is openably and closably attached to the main body 12 via a hinge 14 to display predetermined information. And a display unit 13 having a. The housing may be made of a dielectric material, and may be made of a material other than resin.

As shown in detail in FIG. 2, the antenna device according to the present embodiment has a display unit 13 which is a part of the housing.
Side housing portion 15, a radiation electrode (first electrode) 17 formed over a predetermined area on the first main surface 16 that is one surface of the housing portion 15, and The first main surface 16 and the second main surface 18 opposite to the first main surface 16 are formed with a ground electrode (second electrode) 19 formed over a predetermined area (here, the entire surface).

Here, the personal computer 11 is connected to the ground electrode 19.
An electromagnetic shield that shields unwanted radiation emitted from the electronic circuit installed inside is used, and by making this electromagnetic shield the ground potential, it functions as a ground electrode.

Then, the discharge electrode 17 and the ground electrode 19
Is formed by immersing the casing 15 in a plating bath while masking the area other than the radiation electrode forming area on the first main surface 16. Note that the discharge electrode 17 and the ground electrode 19 may be formed on the housing 15 by using a coating technique, a vapor deposition technique, a printing technique, an adhesion technique, or the like, or a combination of these techniques, in addition to the plating technique. it can. Further, on the first main surface 16, a conductive member may be present in a portion other than the discharge electrode 17.

On the first main surface 16, a power supply line 21 for transmitting electric power from the high frequency circuit 20 built in the main body 12 to the radiation electrode 17 is integrally formed with the radiation electrode 17. Then, the radiation electrode 17 receives power from the high frequency circuit 20. The high frequency circuit 20 may be directly connected to the power supply line 21, or may be connected to the power supply line 21 via another power supply line such as a coaxial cable.

In FIG. 2, the radiation electrode 17 and the power supply line 21 are shown to be exposed to the outside, but they are generally hidden by surface coating or the like and cannot be recognized from the outside.

As shown in the figure, the radiation electrode 17 is attached to the housing 1
It is a diversity antenna that is formed in two places in 5. However, the radiation electrode 17 can be formed at one location or at three or more locations. When a plurality of radiation electrodes 17 are formed, the radiation electrodes 17 can operate in the same frequency band, in different frequency bands, or independently in a plurality of different frequency bands. Also,
When formed in one place, only in a single frequency band,
Alternatively, it can be operated in a plurality of frequency bands.

According to the antenna device of the present embodiment as described above, the electromagnetic shield provided on the housing of the personal computer 11 is used as the ground potential and this is used as the ground electrode 19, and the radiation electrode 17 is provided on the surface opposite to the ground electrode 19. Since the radiating electrode 17 is laid out, the layoutable region of the radiating electrode 17 is the entire one side of the electromagnetically shielded casing, and the degree of freedom in antenna installation can be greatly improved.

Further, since the radiation electrode 17 and the ground electrode 19 are integrated with the housing portion 15, it is possible to reduce the number of parts and the number of assembling steps.

In this embodiment, the radiation electrode 1
7 and the ground electrode 19 are formed on the housing on the side of the display unit 13, but may be formed on the housing of the main body 12 as shown in FIG. Further, the formation position is not limited to the position shown in the present embodiment, and can be set freely.

In the above-described embodiment, the case where the antenna device according to the present invention is applied to the personal computer 11 which is one of the electronic devices has been described. Various electronic devices (for example, PDA, etc.) such as information devices and home electric appliances which have a housing made of a body and are provided with an electromagnetic shield and have a wireless communication function.
・ Cellular phones, liquid crystal displays, VTRs, digital cameras, cordless phones, facsimiles, video game machines,
It can be applied to printers, scanners, audio equipment, etc.).

[0027]

As is apparent from the above description, according to the present invention, the following effects can be obtained.

(1). An electromagnetic shield provided on the housing of an electronic device having a wireless communication function is used as a ground potential, and this is used as a second electrode. A high frequency circuit is provided on a surface of the housing opposite to the second electrode. Since the first electrode that receives the power of is formed, the layoutable area of the first electrode is the entire one side of the electromagnetically shielded housing, and the degree of freedom in antenna installation can be greatly improved. become.

(2). Since the first electrode and the second electrode are integrated with the casing, it is possible to reduce the number of parts and the number of assembling steps.

[Brief description of drawings]

FIG. 1 is a perspective view showing a personal computer in which an antenna device according to an embodiment of the present invention is used.

FIG. 2 is a cutaway view showing a main part of an antenna device mounted on the personal computer shown in FIG.

FIG. 3 is a side view showing a personal computer using an antenna device according to another embodiment of the present invention.

FIG. 4 is a perspective view showing an antenna device mounted on a conventional personal computer.

[Explanation of symbols]

11 PC (electronic device) 12 Main body 13 Display 14 Hinge 15 Case 16 First main surface 17 Radiation electrode (first electrode) 18 Second main surface 19 Ground electrode (second electrode) 20 high frequency circuit 21 power line 111 personal computer 112 main body 113 display 117 antenna 120 high frequency circuit 121 coaxial cable

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Claims (8)

[Claims] 1. A housing portion which is made of a dielectric material and forms a part of a housing of an electronic device having a wireless communication function, and is formed over a predetermined area on a first main surface of the housing portion. The electronic device is formed over a predetermined area on the first electrode that receives power from the high-frequency circuit and the second main surface of the housing portion that is located on the opposite side of the first main surface. An antenna device, comprising: a second electrode which is shielded from unnecessary radiation emitted from an electronic circuit and which is grounded. 2. The antenna device according to claim 1, wherein one of the first electrodes is formed on the casing. 3. The antenna device according to claim 2, wherein the first electrode operates in a single frequency band or a plurality of frequency bands. 4. The antenna device according to claim 1, wherein a plurality of the first electrodes are formed on the casing. 5. The antenna device according to claim 4, wherein the first electrodes operate in the same frequency band, in different frequency bands, or independently in a plurality of different frequency bands. 6. The at least one of the first electrode and the second electrode is formed on the housing portion by plating, painting, vapor deposition, printing or adhesion. The antenna device according to claim 5. 7. The power supply line for transmitting electric power from the high frequency circuit to the first electrode is at least partially formed integrally with the first electrode on the first main surface. The antenna device according to any one of claims 1 to 6. 8. An electronic device comprising a wireless communication function, wherein the antenna device according to claim 1 is used.