JP2001160706A - Mobile object communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide mobile object communication equipment capable of sufficiently suppressing the influence of electromagnetic waves on a human body and facilitating the design of the entire mobile object communication equipment. SOLUTION: This mobile object communication equipment with a built-in chip antenna is provided with a case body, a shield provided on the inner wall of the case body, an insulation body provided on a surface opposite to a human body side in the mobile object communication equipment for constituting the case body and the chip antenna with directivity arranged inside the insulation body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mobile communication device having a built-in antenna.

[0002]

2. Description of the Related Art FIG. 6 is a side view showing a conventional mobile communication device 500 having a built-in antenna.

FIG. 7 is a perspective view showing a conventional mobile communication device 500, in which the housing 90 is removed.

In the conventional mobile communication device 500, mounted components are mounted on a printed circuit board 30, and among the mounted components,
The parts that emit unnecessary radiation are stored in the shield case 70,
A chip antenna 80 is formed on the shield case 70. The chip antenna 80 is a patch antenna or an inverted F-type antenna.

[0005] In the conventional mobile communication device 500, a speaker 41, a display 42, a keypad 43, and other mounting parts 51 are provided on a printed circuit board 30, and a battery 52 is provided inside a housing 90. ing.
In the conventional mobile communication device 500, when a shield electrode is formed by plating or the like on the inner wall of the housing 90, which is an insulator such as plastic, when the chip antenna 80 is provided inside the shield electrode, Since good characteristics cannot be obtained, the chip antenna 80 cannot be provided inside the shield electrode.

Japanese Patent Application Laid-Open No. H11-122033 discloses an example in which a patch or an inverted-F antenna built in a housing is formed on a dielectric. In this example, a built-in antenna corresponding to dualization or the like is proposed by configuring a plurality of elements on a dielectric.

Further, an example in which an antenna is formed in a part of a housing of a portable telephone is disclosed in Japanese Patent Application Laid-Open No. H11-215022. In this example, a monopole-type antenna element is built in a protective cover that can be opened and closed, and the cover is opened when used to function as an antenna.

[0008]

Recently, the miniaturization of communication equipment has been greatly advanced, and instead of using a shield case inside, a conductor is formed inside the case by electroless plating or the like to reduce the shielding effect. Some things to have.

In this case, if an internal antenna is formed in the internal substrate or the internal shield case, as described above,
Since the antenna exists inside the shield, there is a problem that radio waves cannot be transmitted and received and communication cannot be performed.

[0010] The reason why the antenna of the mobile communication device is incorporated in the housing is to adjust the directivity of the antenna, and to suppress the influence of the electromagnetic wave on the human body by adjusting the directivity.

In the invention described in Japanese Patent Application Laid-Open No. H11-122033, a built-in antenna is proposed for the purpose of reducing the size of the set. Special processing and consideration are required so that there is no influence, and there is a problem that this special processing is complicated.

Further, in the invention described in Japanese Patent Application Laid-Open No. H11-215022, the influence on the human body is somewhat considered,
Since an omnidirectional monopole antenna is used, there is basically a problem that the influence on the human body cannot be sufficiently reduced. In addition, since the antenna has a special structure, it is necessary to design the antenna together with the design of the set, and there is a problem that the design is very complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mobile communication device capable of sufficiently suppressing the influence of electromagnetic waves on a human body and easily designing the entire mobile communication device.

[0014]

According to the present invention, there is provided a shield provided on an inner wall of a housing, and an insulator provided on a surface of the mobile communication device opposite to a human body and constituting the housing. , A mobile communication device including a chip antenna having directivity, which is arranged inside a wall formed by the insulator.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view showing a mobile communication device 100 according to a first embodiment of the present invention.

FIG. 2 is an oblique perspective view showing the mobile communication device 100, and is a perspective view showing a state where the housing C is removed.

The mobile communication device 100 has a shield 1 on its inner wall.
The chip antenna 20 having directivity is arranged inside the insulator C2 on the surface opposite to the human body side of the housing C forming 0. That is, the chip antenna 20 is disposed inside the wall formed by the insulator C2.

The case C is constituted by a case C1 on the side of the human body and a case C2 on the side opposite to the side of the human body.
The housing C2 on the opposite side is made of an insulator. In addition,
In the expression “opposite to the human body side”, “human body side” refers to the side of the mobile communication device 100 on which the speaker 41 is provided, and the opposite side (anti-human body side). , A housing C2.

In the mobile communication device 100, a speaker 41, a display 42, a keypad 43, and a mounting component 51 are provided on a printed circuit board 30, and a battery 52 is housed in a housing C.

In this case, the shield 10 is provided on the inner wall of the casing C by electroless plating, vapor deposition, coating, or the like.
This constitutes a shield of the RF circuit.

An insulator having a low dielectric constant is used as a resin material such as plastic which forms the housing C so as not to affect the antenna characteristics very much.

FIG. 3 is an exploded perspective view showing a state immediately before the chip antenna 20 is attached to the housing C in the mobile communication device 100.

The chip antenna 20 is mounted on the anti-human body casing C2 (the surface opposite to the human body side on which the speaker 41 is provided).
Is provided, and the chip antenna 20 is mounted in the hole 60.

A feed point 22 is provided on an antenna patch conductor 21 constituting the chip antenna 20, and a feed coaxial line 23 is connected to the feed point 22. On the other hand, a through hole 61 is formed in a hole 60 provided on the anti-human body side C2, and the power supply coaxial cable 23 passes through the through hole 61 and is connected to the printed circuit board 30.

FIG. 4 shows that, in the mobile communication device 100, after the chip antenna 20 is attached to the housing C2 on the anti-human body side,
It is a side view which shows the state just before attaching the cap 24 for antenna storage.

When power is supplied to the antenna 20, as described above, the through hole 61 is provided in the housing C 2, the coaxial line 23 is passed through the through hole 61, and the power supply point 22 of the antenna patch conductor 21 is
The end of the coaxial cable 23 is soldered.

FIG. 5 is an exploded perspective view showing a mobile communication device 200 according to a second embodiment of the present invention.

The mobile communication device 200 is basically the same as the mobile communication device 100, and differs from the mobile communication device 100 only in the connection method of the chip antenna 20.

That is, the mobile communication device 200 connects the antenna 20 by capacitive coupling, and the capacitive coupling land 2 is located near the feeding point of the antenna conductor 21 of the antenna 20.
5 is provided, and on the other hand, a capacitive coupling land 26 is provided on the back surface (inner surface) of the anti-human body side case C2, and the lands 25 and 26 are opposed to each other. Note that a shield 10 is provided on the inner surface of
Are provided, and the shields 10 corresponding to the lands 25 and 26 are provided.
Is provided with a shield cutout 13.

The chip antenna 20 is formed by a double-sided tape, an adhesive, a clip for sandwiching, or the like.
Fixed to 2.

The chip antenna 20 used here is a patch antenna based on a dielectric or a magnetic material. Instead of the above-mentioned patch antenna, an antenna that can be configured on the GND plane, such as an inverted F antenna or a microstrip antenna, is used. You may make it.

According to the above embodiment, the mobile communication device 10
Of the electromagnetic waves radiated from the mobile communication devices 100 and 200 during use of 0 and 200, the electromagnetic wave going to the human body is reflected by the shield 10, and therefore, the influence of the radiated electromagnetic wave on the human body is suppressed. be able to.

Further, according to the above embodiment, at least a part of the chip antenna 20 is embedded in the housing C2, so that the thickness of the mobile communication devices 100 and 200 is increased by the thickness of the chip antenna 20 embedded. Can be reduced, and the mobile communication device can be made thinner as a whole.

Further, in the above embodiment, since there is no need to provide a shield case inside the mobile communication device, it is possible to reduce the cost for installing the shield case.

Further, since the antenna 20 is embedded in the resin material of the housing C2, the dead space in the mobile communication device can be minimized.

In the above embodiment, basically, GND
Since the antenna can be arranged anywhere on the surface, the antenna can be designed by itself and the design of the antenna alone and the design of the entire communication device are easy.

[0037]

According to the present invention, the effect of the electromagnetic wave on the human body can be sufficiently suppressed, and the design of the entire mobile communication device is easy.

[Brief description of the drawings]

FIG. 1 shows a mobile communication device 10 according to a first embodiment of the present invention.
FIG.

FIG. 2 is an oblique perspective view showing the mobile communication device 100, and is a perspective view showing a state where a housing C is removed.

FIG. 3 is an exploded perspective view showing a state immediately before attaching a chip antenna 20 to a housing C in the mobile communication device 100.

FIG. 4 shows a mobile communication device 100 with an anti-human body housing C.
FIG. 2 is a side view showing a state after the chip antenna 20 is attached to the antenna 1 and immediately before the antenna storage cap 24 is attached.

FIG. 5 shows a mobile communication device 20 according to a second embodiment of the present invention.
FIG.

FIG. 6 shows a conventional mobile communication device 500 having a built-in antenna.
FIG.

FIG. 7 is a perspective view showing a conventional mobile communication device 500;
It is a perspective view showing the state where the case 90 was removed.

[Explanation of symbols]

 100, 200: Mobile communication device, 10: Shield, 20: Chip antenna, 23: Coaxial line for power supply, 25, 26: Land for capacitive coupling, 30: Printed circuit board, 41: Speaker, 61: Through hole, C: Case, C1: Case on the human body side, C2: Case on the anti-human body side.

Claims (2)

[Claims] A housing; a shield provided on an inner wall of the housing; an insulator provided on a surface of the mobile communication device opposite to a human body side and constituting the housing; And a chip antenna having directivity disposed inside a wall formed by a body. 2. The mobile communication device according to claim 1, wherein the chip antenna is at least one of a patch antenna, an inverted F antenna, and a microstrip antenna.