JP5115587B2 - Portable wireless terminal - Google Patents

Description

  The present invention relates to a configuration of a portable wireless terminal having high communication performance of an antenna arranged close to a display unit.

  With the rapid development of mobile phones, multiple wireless systems (GPS, Bluetooth, 1Seg digital television, Wireless LAN) are installed in mobile phones, and multiple communication antennas corresponding to each system are required. Yes. On the other hand, as mobile phones are becoming thinner, in order to mount a plurality of antennas on a small mobile phone, the antennas are arranged in a slight gap in the case of the mobile phone. Therefore, the antenna is disposed in the vicinity of the electronic component, the display unit, and the circuit board that exist inside the casing of the mobile phone, and stable and high radiation characteristics are required in that state.

  As a specific example for realizing such an antenna, for example, the one shown in Patent Document 1 is known. In this antenna configuration, good antenna characteristics are ensured by arranging an L-shaped antenna element at the upper corner of the upper case of the mobile phone and separating it from the ground part of the case.

  In addition, for example, in the antenna configuration of Patent Document 2, a thin mobile phone is realized by configuring a transparent conductor radiating element and a ground plane on a liquid crystal display surface as a patch antenna arranged in the same plane. .

  As another configuration for thinning, for example, in the antenna configuration of Patent Document 3, the antenna configuration is simplified and thinned by using the conductor of the touch panel as the ground of the patch antenna.

JP 2009-111783 A JP-A-11-177336 JP 2003-280815 A

  However, in the antenna configuration of Patent Document 1, in order to perform unbalanced power feeding to the antenna, the antenna current is distributed to the nearby ground and the antenna element is close to the liquid crystal unit. When the antenna current is distributed also in the liquid crystal part, there is a possibility that the radiation characteristic may be deteriorated and the communication performance may be impaired.

  Further, in the antenna configuration of Patent Document 2, the patch antenna is configured in the same plane on the display display to achieve a reduction in thickness. For example, when the antenna is mounted on a folding mobile phone, the antenna element is not closed. Since it is sandwiched between the ground of the patch antenna of the upper casing and the ground of the circuit board of the lower casing, the radiation characteristics are remarkably deteriorated, and it is difficult to ensure good communication performance when closed.

  Further, in the antenna configuration of Patent Document 3, the touch panel conductor is used as a ground for the patch antenna, so that the thickness is reduced. For example, when the antenna element is mounted on a folding mobile phone, the antenna element is closed. Is sandwiched between the ground of the touch panel conductor and the ground of the circuit board of the lower housing, the radiation characteristics are remarkably deteriorated, and it is difficult to ensure good communication performance when closed.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide high call performance in an antenna disposed in the vicinity of a display unit, and also to mobile phones having various shapes. It is to provide a portable radio that is applicable.

The portable wireless device of the present invention includes a housing that accommodates a circuit board of the portable wireless device, a display unit that is arranged with a non-display surface facing the circuit board at a predetermined interval, and the display unit. A touch panel disposed on the display surface side, an antenna element disposed between the display unit, the circuit board, and the touch panel at a predetermined interval and between an inner wall of the housing, and the antenna element A power feeding unit that feeds power, and a high-frequency connection point that connects the touch panel and the ground of the circuit board in the vicinity of the power feeding unit at a high frequency, and the touch panel and the ground of the circuit board are predetermined at least at two or more locations. a high-frequency manner is connected at a distance, and the touch panel by one position first is provided near the feeding, the two locations subsequent to provide at a substantially half-wavelength spacing than the high-frequency connection point A ground of the serial circuit board is preferably a high frequency connected. With this configuration, it is possible to realize high call performance in the antenna disposed in the vicinity of the display unit. That is, it is possible to provide a portable wireless terminal that can exhibit high communication performance and is excellent in design.

The portable wireless device of the present invention is arranged so that a non-display surface is opposed to a housing provided with a metal frame around a display unit that accommodates a circuit board of the portable wireless device, with a predetermined interval from the circuit board. A display panel, a touch panel disposed on the display surface side of the display unit and in proximity to the metal frame, the display unit, the circuit board, and the touch panel being maintained at a predetermined interval, and the housing An antenna element disposed between an inner wall of the body, a power feeding unit that feeds power to the antenna element, and a high-frequency connection point that connects the touch panel and the metal frame at a high frequency, the metal frame and the metal frame The circuit board ground in the vicinity of the power feeding part is connected in high frequency with a predetermined interval at least two places, and the first place is provided in the vicinity of the power feeding , and the second and subsequent places are substantially shorter than the high frequency connection point. Separate half wavelength interval It is preferred that said metal frame and said touch panel is high frequency coupled by providing Te. With this configuration, it is possible to realize high call performance in the antenna disposed in the vicinity of the display unit. That is, it is possible to provide a portable wireless terminal that can exhibit high communication performance and is excellent in design.

  According to the portable wireless device of the present invention, high call performance can be exhibited in the antenna disposed in the vicinity of the display unit.

(A) Front view of the mobile phone 10 in the first embodiment of the present invention, (b) Cross-sectional view of the broken line AA 'portion of the mobile phone 10 in the first embodiment of the present invention. (A) Front view of the mobile phone 20 in the second embodiment of the present invention, (b) Cross-sectional view of the broken line BB 'portion of the mobile phone 20 in the second embodiment of the present invention (A) Front view of mobile phone 30 in the third embodiment of the present invention, (b) Cross-sectional view of the broken line CC 'portion of the mobile phone 30 in the third embodiment of the present invention

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 shows a mobile phone 10 according to a first embodiment of the portable wireless device of the present invention, and FIG. 1 (a) is a front view of the mobile phone 10 according to the first embodiment of the present invention. FIG. 1B is a cross-sectional view taken along the broken line AA ′ of the mobile phone 10 according to the first embodiment of the present invention.

  The mobile phone 10 of FIG. 1 includes a housing 17, an antenna element 11, an impedance matching circuit 12, a circuit board 14, a touch panel 15, a liquid crystal unit 16, and a high-frequency connection unit 13 inside the housing 17. Prepare.

  The antenna element 11 is arranged with a predetermined distance (for example, about 5 mm) from the ground portion of the circuit board 14, the touch panel 15, and the liquid crystal portion 16. The other of the antenna elements 11 is open, and the other one is electrically connected to the impedance matching circuit 12 and is fed with unbalance. The impedance matching circuit 12 is formed by a circuit that matches the antenna element 11 to an impedance of, for example, 50 ohms at a predetermined frequency.

  The touch panel 15 is generally composed of a transparent conductor, operates by a resistance film method or a capacitance method, and is disposed between the display surface of the liquid crystal unit 16 and an upper case (not shown) of the housing 17. The

  Further, the circuit board 14 is disposed between a surface of the liquid crystal unit 16 that is not displayed and a lower case (not shown) of the housing 17.

  The touch panel 15 and the ground of the circuit board 14 are connected in high frequency by a high frequency connection portion 13 formed of a conductive material at four corners including the vicinity of the matching circuit 12 that is a feeding portion of the antenna element 11. The

  Next, the operation of the mobile phone 10 according to the first embodiment of the present invention will be described.

  In general, the antenna element 11 is set to have an element length of, for example, about ¼ wavelength of the operating frequency band in order to ensure the bandwidth of the operating frequency and facilitate impedance matching. Further, since the cellular phone 10 is often used while being held by hand, in this state, the antenna element 11 is disposed at the upper end of the housing 17 that is hardly covered by the hand. Furthermore, the antenna element 11 is arranged with a predetermined interval (for example, about 5 mm) with respect to the ground of the circuit board 14 adjacent to the antenna element 11, the touch panel 15 and the liquid crystal unit 16 in order to ensure antenna performance. Is done.

  However, since the element length of the antenna element 11 is ¼ wavelength, the antenna current is distributed also on the circuit board 14 and also on the liquid crystal unit 16 adjacent thereto. Here, since the liquid crystal part 16 does not contribute to radiation due to its electrical characteristics, there is a concern that the radiation efficiency may be deteriorated when the antenna current is distributed in the liquid crystal part 16.

  In the present embodiment, the liquid crystal unit 16 is sandwiched between the touch panel 15 and the ground of the circuit board 14, and the touch panel 15 and the ground of the circuit board 14 are connected to the high-frequency connection unit 13 (for example, capacitive coupling terminals, conductive rubber, connection springs). ) To make a high frequency connection. The high-frequency connection unit 13 is provided at four corners including the vicinity ground of the matching circuit 12 that is the feeding unit of the antenna element 11. As a result, the antenna current distributed in the liquid crystal unit 16 can be distributed to the ground of the touch panel 15 and the circuit board 14, the antenna current distribution of the liquid crystal unit 16 can be reduced, and high radiation efficiency can be ensured.

  Specifically, for example, the 2.4 GHz band WLAN antenna element 11 is provided along the housing 17 with an element length of 1/4 wavelength in the 2.4 GHz band, and a distance of 5 mm from the ground of the circuit board is secured. The antenna element 11 has an L-shaped configuration and is provided with four corners including the vicinity of the matching circuit 12 serving as a power feeding portion at a high frequency connection portion 13 that connects the touch panel 15 and the ground of the circuit board 14 at a high frequency. The radiation efficiency can be improved by about 1.5 dB compared to the case where the touch panel 15 and the ground of the circuit board 14 are not connected at high frequency.

  Therefore, according to the present embodiment, the antenna element 11 is arranged with a predetermined distance from the ground of the circuit board 14, the touch panel 15 and the liquid crystal part 16, and the high frequency connection part 13 connects the touch panel 15 and the ground of the circuit board 14. Thus, by connecting at high frequency at four corners including the vicinity of the matching circuit 12 which is a power feeding unit, high radiation characteristics can be ensured and good communication performance can be ensured.

  In the present embodiment, four corners have been described as the arrangement conditions for the high-frequency connection portion. However, the present invention is not limited to this, and all four sides may be high-frequency connected.

  Compared with the case where the high frequency connection portion is provided at least in the vicinity of the feeding portion of the antenna element, and the high frequency connection portion is provided at a substantially half wavelength interval of the operating frequency of the antenna element from the connection portion. The improvement effect is reduced by about 0.5 dB, but almost the same communication performance can be ensured.

  In addition, although a straight structure terminal has been described, the present invention is not limited to this, and almost the same communication performance can be ensured even in a folding structure terminal and a slide structure terminal.

  Although the antenna element has been described as a WLAN antenna, the present invention is not limited to this. Even when a plurality of antennas for GPS, cellular communication, etc. mounted in the vicinity of the liquid crystal unit are arranged, substantially the same improvement effect is obtained. It can be seen.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to FIG. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals to avoid redundant description.

  FIG. 2A is a front view of the mobile phone 20 according to the second embodiment of the present invention, and FIG. 2B is a broken line BB ′ portion of the mobile phone 20 according to the second embodiment of the present invention. It is sectional drawing.

  The cellular phone 20 in FIG. 2 is different from the cellular phone 10 in FIG. 1 in that a metal frame 22 is provided on the display surface of the housing 21 and the metal frame 22 and the ground of the circuit board 14 are connected by a high-frequency connection 23. Is a point.

  The metal frame 22 is a conductive material, is configured to surround the touch panel 15 and the liquid crystal unit 16 on the display surface side of the housing 21, and is disposed so as to be close to the touch panel 15. Connected. The metal frame 22 and the ground of the circuit board 14 are connected at a high frequency by a high-frequency connection portion 23 formed of a conductive material at four corners including a vicinity ground of the matching circuit 12 that is a feeding portion of the antenna element 11. Is done.

  The antenna element 11 is arranged with a predetermined distance (for example, about 5 mm) from the metal frame 22.

  Next, the operation of the mobile phone 20 in the second embodiment of the present invention will be described.

  In the present embodiment, the liquid crystal unit 16 is sandwiched between the touch panel 15 and the ground of the circuit board 14, and the touch panel 15 and the metal frame 22 are disposed close to each other. Furthermore, by connecting the metal frame 22 and the ground of the circuit board 14 at a high frequency using a high frequency connection portion 23 (for example, a capacitive coupling terminal, a conductive rubber, a connection spring), as a result Operates so that the touch panel 15 and the circuit board 14 are connected at a high frequency. Moreover, the high frequency connection part 23 is provided in four corners including the vicinity ground of the matching circuit 12 which is a feeding part of the antenna element 11. As a result, the antenna current distributed in the liquid crystal unit 16 can be distributed to the ground of the touch panel 15 and the circuit board 14, the antenna current distribution of the liquid crystal unit 16 can be reduced, and high radiation efficiency can be ensured.

  As a specific effect, as in the first embodiment, it can be improved by about 1.5 dB as compared with the case where the metal frame 22 and the ground of the circuit board 14 are not connected in high frequency.

  Therefore, according to the present embodiment, the antenna element 11 is disposed with a predetermined distance from the ground of the circuit board 14, the touch panel 15, the liquid crystal unit 16, and the metal frame 22, and is connected to the touch panel 15 in high frequency. By connecting the metal frame 22 and the ground of the circuit board 14 at high frequency at four corners including the vicinity of the matching circuit 12 that is a power feeding portion by the high frequency connection portion 23, high radiation characteristics can be ensured, Good communication performance can be secured.

  In the present embodiment, four corners have been described as the arrangement conditions for the high-frequency connection portion. However, the present invention is not limited to this, and all four sides may be high-frequency connected.

Compared with the case where the high frequency connection portion is provided at least in the vicinity of the feeding portion of the antenna element, and the high frequency connection portion is provided at a substantially half wavelength interval of the operating frequency of the antenna element from the connection portion. The improvement effect is reduced by about 0.5 dB, but almost the same communication performance can be ensured.
(Third embodiment)
Next, a third embodiment of the present invention will be described in detail with reference to FIG. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals to avoid redundant description.

  3A is a front view of the mobile phone 30 according to the third embodiment of the present invention, and FIG. 3B is a broken line CC ′ portion of the mobile phone 30 according to the third embodiment of the present invention. It is sectional drawing.

  The difference between the mobile phone 30 in FIG. 3 and the mobile phone 10 in FIG. 1 is that the liquid crystal part 16 is covered with a transparent conductive material 32.

  The transparent conductive material 32 is a conductive material, is configured inside the housing 31 so as to cover the display surface and the back surface of the liquid crystal unit 16, and the distance between the antenna element 11 and the transparent conductive material 32 is, for example, about 5 mm. Kept in place.

  Next, the operation of the mobile phone 30 according to the third embodiment of the present invention will be described.

  In this embodiment, since the liquid crystal part 16 is sandwiched between the transparent conductive materials 32, the antenna current distributed in the liquid crystal part 16 can be distributed in the transparent conductive material 32, and the antenna current distribution in the liquid crystal part 16 is reduced. High radiation efficiency can be ensured.

  As a specific effect, as in the first embodiment, it can be improved by about 1.5 dB compared to the case where the liquid crystal part 16 is not sandwiched between the transparent conductive materials 32.

  Therefore, according to this embodiment, the antenna element 11 is arranged with a predetermined distance from the ground of the circuit board 14, the transparent conductive material 32, and the liquid crystal part 16, and the liquid crystal part 16 is covered with the transparent conductive material 32. By doing so, high radiation characteristics can be secured, and good communication performance can be secured.

  The portable wireless device of the present invention has an effect that the casing can be thinned and can exhibit high call performance, and is useful for mobile phones having various shapes.

10, 20, 30 Mobile phone 11 Antenna element
DESCRIPTION OF SYMBOLS 12 Matching circuit 13, 23 High frequency connection part 14 Circuit board 15 Touch panel 16 Liquid crystal part 17, 21, 31 Case 22 Metal frame 32 Transparent conductive material

Claims (2)

A housing for housing the circuit board of the portable wireless device;
A display unit disposed with a non-display surface facing the circuit board at a predetermined interval;
A touch panel disposed on the display surface side of the display unit;
An antenna element that is disposed between the display unit, the circuit board, and the touch panel at a predetermined interval and between the inner wall of the housing;
A power feeding unit that feeds power to the antenna element;
A high-frequency connection point that connects the touch panel and the ground of the circuit board in the vicinity of the power supply section at a high frequency ,
The touch panel and the ground of the circuit board are connected in high frequency with a predetermined interval at least at two or more locations, the first location is provided in the vicinity of the power supply, and the second and subsequent locations are approximately half wavelength from the high frequency connection point. A portable wireless device characterized in that the touch panel and the ground of the circuit board are connected at a high frequency by providing them at an interval . A housing with a metal frame around the display unit that houses the circuit board of the portable wireless device;
A display unit disposed with a non-display surface facing the circuit board at a predetermined interval;
A touch panel arranged on the display surface side of the display unit and in proximity to the metal frame;
An antenna element that is disposed between the display unit, the circuit board, and the touch panel at a predetermined interval and between the inner wall of the housing;
A power feeding unit that feeds power to the antenna element;
A high-frequency connection point for connecting the touch panel and the metal frame at a high frequency ,
The metal frame and the ground of the circuit board in the vicinity of the power feeding part are connected at a high frequency with a predetermined interval at least two places, and the first place is provided in the vicinity of the power feeding and the second and subsequent places are the above A portable wireless device characterized in that the touch panel and the metal frame are connected at a high frequency by providing a substantially half-wavelength interval from a high frequency connection point .

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