JP2003273621A - Portable electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable electronic device in which the radiation characteristics of a chip antenna are secured by eliminating an increase in mutual conductance by canceling mutual induction between the chip antenna and an antenna check terminal even when a miniaturized chip antenna is used. <P>SOLUTION: The portable electronic device is provided with a chip antenna 60 for transmitting and receiving radio waves, a circuit board 50 mounted with the chip antenna 60, and an antenna check terminal 64 of a metal casing which is mounted on the circuit board 50 for checking the operation of the circuit board 50 by receiving an inspection radio wave signal from the outside and which is positioned near an end along the lengthwise direction of the chip antenna 60. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in portable electronic equipment having a chip antenna.

[0002]

2. Description of the Related Art As a portable electronic device having an antenna for transmitting and receiving radio waves, there is, for example, a mobile phone. The mobile phone has various antennas as shown in FIGS. A substrate 1000 of the conventional mobile phone shown in FIG. 6 has a whip antenna 1001 and an antenna check terminal 1003, and a ground 1004 is formed on the substrate 1000. Necessary circuit elements are arranged on the substrate 1000. The substrate 1010 of FIG. 7 is a helical antenna 10.
11 and an antenna check terminal 1003. The substrate 1020 in FIG. 8 has a small chip antenna 1021 and an antenna check terminal 1003.

Antenna check terminal 1 of a mobile phone terminal
003 is a whip antenna 1001 and a helical antenna 1 on the substrates 1000, 1010, 1020.
011 is mounted in the vicinity of the chip antenna 1021. Since the whip antenna 1001 shown in FIG. 6 and the helical antenna 1011 shown in FIG. 7 are relatively large in size due to the demand for miniaturization of mobile phones, the small chip antenna 1021 shown in FIG. 8 is replaced with a whip antenna or a helical antenna. It has been adopted. The antenna check terminal 1003 supplies a radio signal for inspection to a circuit element formed on the substrate 1020 for checking before mounting the chip antenna 1021 when manufacturing a mobile phone in a manufacturing process. Is a terminal for checking transmission / reception of circuit elements.

[0004]

The whip antenna 1001 and the helical antenna 1011 described above are considerably larger than the antenna check terminal 1003. Even if the antenna check terminal 1003 of the metal housing is arranged close to the whip antenna (radiating element) 1001 and the helical antenna (radiating element) 1011, the influence of the mutual induction action on the antenna is small. However, a small chip antenna 1021 as shown in FIG.
In the case of using, the antenna check terminal 1003 of the metal casing is used for the chip antenna 1021 (radiating element)
Are close to each other and the axial direction CL is the chip antenna 1021.
If they are arranged parallel to the longitudinal direction, the mutual induction effect greatly affects the characteristics of the chip antenna 1021.

The mutual induction action increases the mutual conductance of the chip antenna 1021. As a result, the resonance frequency of the chip antenna 1021 is lowered, the bandwidth is changed, or VSWR (voltage standing wave ratio) or radiation characteristics are deteriorated. Therefore, the present invention solves the above problems and, even when using a small chip antenna, eliminates the mutual induction action between the chip antenna and the antenna check terminal, eliminates the increase in mutual conductance, and improves the radiation characteristics of the chip antenna. An object is to provide a portable electronic device that can be secured.

[0006]

According to the invention of claim 1, a chip antenna for transmitting and receiving radio waves,
It is a circuit board on which the chip antenna is mounted, and an antenna check terminal of a metal casing mounted on the circuit board for checking the operation of the circuit board by supplying an inspection radio signal from the outside. And the antenna check terminal located near the end of the chip antenna along the longitudinal direction. In the first aspect, the chip antenna transmits and receives radio waves. A chip antenna is mounted on the circuit board. The antenna check terminal is mounted on the circuit board, and the antenna check terminal is a terminal for checking the operation of the circuit board by supplying an inspection radio signal from the outside.
The antenna check terminal is located near the end of the chip antenna along the longitudinal direction. This allows
The antenna check terminal is located at the end along the longitudinal direction (also called the axial direction) of the chip antenna, eliminating the mutual induction effect between the chip antenna and the antenna checker and eliminating the increase in mutual conductance. It is possible to prevent deterioration of the radiation characteristics of the chip antenna.

According to a second aspect of the present invention, in the portable electronic device according to the first aspect, the antenna check terminal is formed as a line as a part of the ground of the circuit board.
According to the second aspect, since the antenna check terminal is formed as a line as a part of the ground of the circuit board, the ground ability of the antenna check terminal of the metal housing can be improved.

According to a third aspect of the present invention, in the portable electronic device according to the first aspect, the portable electronic device is a mobile phone.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiment described below is a preferred specific example of the present invention,
Although various technically preferable limitations are given, the scope of the present invention is not limited to these forms unless otherwise specified in the description below.

1 and 2 show a mobile phone as an example of a portable electronic device. In this example, one battery 100 is detachably attached to the mobile phone 10. The mobile phone 10 includes a housing 12 and one battery (battery) 100,
Display unit 16, antenna 14, speaker 22, microphone 2
0, the operation unit 18 and the like. The battery 100 is a battery for supplying power to the mobile phone 10. The housing 12 has a front portion 24 and a rear portion 26.
As shown in FIG. 2, the battery 100 is detachably attached to the lower portion of the rear portion 26 and the rear surface of the front portion 24. The display unit 16 is a unit for displaying various information,
For example, a liquid crystal display device can be used. The speaker 22 is for listening to voice, and the microphone 20 is a part for inputting the voice of the operator. The operation unit 18 has a ten-key pad 18C, a button 18A for making a call, a button 18B for hanging up a call, and the like.

FIG. 3A shows a circuit board 50 housed in the housing 12 of the mobile phone 10 shown in FIGS. The housing 12 is shown by a chain double-dashed line, and the circuit board 50 is shown by a solid line. The circuit board 50 has a ground (GND) 51, a circuit portion 54, a small chip antenna 60, and an antenna check terminal 64. The antenna check terminal 64 is also called an antenna checker terminal.

FIG. 4 is a circuit portion 5 of the circuit board 50 shown in FIG.
4 shows a configuration example of No. 4. The chip antenna 60 is a smaller antenna than the conventionally used whip antenna or helical antenna, and is a small antenna that meets the demand for miniaturization and high functionality of wireless communication devices. The chip antenna 60 is mounted and arranged on the circuit board 50. The chip antenna 60 is formed by laminating ceramics, for example, and is, for example, a monopole type omnidirectional antenna used for a wireless communication device having a frequency of 2.4 GHz band.

The antenna check terminal 64 shown in FIGS. 3A and 4 is a metal casing type member as shown in FIG. 3B. The antenna check terminal 64 is made of a conductive metal such as copper, aluminum, brass or other material, and has a cylindrical portion 64A and a base portion 64B. An electric wave signal for inspection is supplied from the outside into the hole 64C of the cylindrical portion 64A for checking whether or not the circuit section 54 shown in FIG. 4 operates normally for electric wave transmission or electric wave reception. for,
Insert the inspection pin detachably. The antenna check terminal 64 is connected to the ground (GND) 5 of the circuit board 50.
It is electrically connected to 1. As a result, the ground ability (grounding ability) of the antenna check terminal 64 can be improved.

The chip antenna 60 has a length in the X direction of Y.
It is set larger than the length in the direction. Regarding the length direction in the X direction (longitudinal direction), one end portion 80 and the other end portion 8
Have one. The antenna check terminal 64 is mounted on the circuit board 50 near the other end portion 81 in the longitudinal direction. Antenna check terminal 6 in this state
4 is electrically connected to the ground (GND) 51. Moreover, the axial direction CL of the antenna check terminal 64 is
That is, the direction of the antenna check terminal 64 is perpendicular to the X direction (longitudinal direction) of the chip antenna 60.

In this way, the antenna check terminal 64 is
The chip antenna 60 (radiating element) is arranged at a position along the axial direction (longitudinal direction, X direction) of the chip antenna 60 and in the vicinity of the other end 81.
It is possible to eliminate the mutual induction action between the antenna check terminal 64 and the antenna check terminal 64 (metal housing), eliminate the increase in mutual conductance, and secure the radiation characteristics of the chip antenna 60. That is, the characteristics of the chip antenna 60 can be improved. FIG. 5 shows how the characteristics of the chip antenna 60 are improved. In FIG. 5, the vertical axis represents VSWR (voltage standing wave ratio), and the horizontal axis represents frequency. As shown in FIG. 5, the chip antenna 60 shown in FIGS. 3 and 4 has a desired frequency, for example, 2.
The value of VSWR can be minimized at 4 GHz.

On the other hand, FIG. 9 shows the influence of the conventional chip antenna for comparison. In FIG. 9, the vertical axis represents VSWR and the horizontal axis represents frequency. In the conventional arrangement example of the chip antenna 1021 and the antenna check terminal 1003 shown in FIG. 8, the longitudinal direction X direction of the chip antenna 1021 and the antenna check terminal 1
The axial direction CL of 003 is parallel, and the chip antenna 1021 and the antenna check terminal 1003 are close to each other. In this case, as shown in FIG. 9, the value of VSWR does not become the minimum at a desired frequency, but becomes a considerably large value. The VSWR becomes minimum at the frequency F1 deviated from the desired frequency.

Further, as described above, since the antenna check terminal 64 shown in FIG. 4 is electrically connected to the ground 51 of the circuit board 50, the antenna check terminal 64 is provided on the circuit board 50 of the mobile phone 10. In addition to improving the ground capability of the antenna, the antenna check terminal 64 can form a line as a part of the length of the ground 51, and the length of the ground can be increased. As a result, unlike the conventional case, the chip antenna 6
It is possible to reduce mutual induction between 0 and the antenna check terminal 64 made of a metal casing, reduce mutual conductance, and improve VSWR and radiation characteristics.

The example of the circuit section 54 shown in FIG.
0, receiver 121, transmitter 122, synthesizer 12
3 and a logic unit 124. Logic unit 124
CPU 125 for receiving and transmitting data
have. The duplexer 120 is the chip antenna 60.
Electrically connected to. As a result, the radio waves transmitted from the outside to the chip antenna 60 can be received by the receiving unit 121 through the duplexer 120 and data can be received. Further, data transmission from the CPU 125 can be performed from the chip antenna 60 to the outside through the transmitter 122 and the duplexer 120.

The present invention is not limited to the above embodiment. In the above-described embodiment, a mobile phone is taken as an example of the portable electronic device, but the present invention is not limited to this, and any other type of portable electronic device, such as a personal digital assistant (PDA) or a portable electronic device, is used. Of course, it may be a computer, a television receiver or the like having the antenna.

[0020]

As described above, according to the present invention,
Even if a small chip antenna is used, the mutual induction action between the chip antenna and the antenna check terminal can be eliminated, the increase in mutual conductance can be eliminated, and the radiation characteristic of the chip antenna can be secured.

[Brief description of drawings]

FIG. 1 is a front view showing a mobile phone which is an example of a portable electronic device of the present invention.

FIG. 2 is a rear view of the mobile phone shown in FIG.

FIG. 3 is a diagram showing an embodiment of the invention.

FIG. 4 is a diagram showing in more detail a circuit portion of the mobile phone shown in FIG.

FIG. 5 is a diagram showing an example of the relationship between VSWR and frequency according to the embodiment of the present invention.

FIG. 6 is a diagram showing a substrate of a mobile phone having a conventional whip antenna.

FIG. 7 is a diagram showing a substrate of a mobile phone having a conventional helical antenna.

FIG. 8 is a diagram showing a substrate of a mobile phone having a conventional chip antenna.

FIG. 9 is a diagram showing an example of the influence on the chip antenna when the conventional chip antenna and the antenna check terminal of FIG. 8 are provided.

[Explanation of symbols]

10 ... Mobile phone (portable electronic device), 12 ... Housing, 50 ... Circuit board, 51 ... Ground, 54 ...
..Circuit section, 60 ... Chip antenna, 64 ... Antenna check terminal

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5J046 AA01 AA02 AB06 AB13 PA02                 5J047 AA01 AA02 AB06 AB13 FD01                 5K023 AA07 BB04 LL01 LL05                 5K027 AA11 BB14 LL02                 5K067 AA21 BB04 EE02 KK01 KK17

Claims (3)

[Claims] 1. A chip antenna for transmitting and receiving radio waves, a circuit board on which the chip antenna is mounted, and an inspection radio signal mounted on the circuit board and supplied from the outside. And an antenna check terminal of a metal casing for checking the operation of the circuit board, the antenna check terminal being located near an end portion along the longitudinal direction of the chip antenna. A portable electronic device characterized by the above. 2. The line is formed as the antenna check terminal as a part of the ground of the circuit board.
The portable electronic device according to. 3. The portable electronic device according to claim 1, wherein the portable electronic device is a mobile phone.