JP2010171954A - Mobile wireless device - Google Patents

Abstract

[PROBLEMS] To widen the distance between a circuit board and a radiating element of an inverted-F antenna while reducing the thickness of a portable wireless device, and to achieve good reception even on a metal plate without adding new parts. A portable wireless device capable of obtaining sensitivity is provided.
In a portable wireless device, a distance from an end of a ground pattern in an extending direction of an antenna element to an open end of an antenna element is separated from the antenna element in a thickness direction of a housing. A ground metal plate 8 was provided. As a result, the thickness of the casing 2 of the portable wireless device 1 can be utilized to the maximum extent to increase the distance between the antenna element 6 and the ground, and compared with the case where the ground pattern 7 of the circuit board 3 is used. Broadband can be achieved. Further, by connecting the ground sheet metal 8 and the ground pattern 7 via the switch 18 and the reactance element 17, the connection of the ground sheet metal 8 can be switched by the switch 18 depending on the situation, and can be operated as a ground wire. Good reception sensitivity can be obtained even on a plate.
[Selection] Figure 1

Description

  The present invention relates to a portable wireless device such as a mobile phone, and more particularly to a portable wireless device using an inverted F antenna.

  As an inverted F antenna used in a portable wireless device such as a cellular phone, there are those disclosed in Patent Document 1 and Patent Document 2, for example. In Patent Document 1 (name of invention: plate-like inverted F antenna and wireless communication device), the shape of the ground pattern of the circuit board on which the inverted F antenna is mounted is a shape excluding the area corresponding to the installation position of the inverted F antenna. The point is disclosed. In Patent Document 2 (name of the invention: antenna device and radio device), feeding to two radiating elements is switchable, a radiating element that is not fed is grounded, and the grounded radiating element is grounded to the radiating element that is fed. A configuration as a conductor is disclosed.

  In order to maintain good reception sensitivity in a state where the portable wireless device is placed on a metal plate, there is one disclosed in Patent Document 3, for example. In Patent Document 3, in order to compensate for radiation from an antenna in which high-frequency currents of opposite phases are canceled and reduced by the mirror effect, an auxiliary ground plane is mounted on the lower housing, and a vertical component is formed by the mirror effect to form a dipole antenna. Is disclosed.

  FIG. 25 is a diagram illustrating a schematic configuration of a conventional inverted-F antenna. As shown in the figure, the inverted F antenna 40 has a configuration in which a radiating element 41 and a ground pattern 44 of a circuit board (not shown) are arranged in parallel, and a power feeding section 42 and a short-circuit section 43 are connected to the ground pattern 44. take. In the inverted F antenna 40, the usable frequency band is narrowed as the distance between the radiating element 41 and the ground pattern 44 is narrowed, and the band is widened when wide.

  FIG. 26 is a diagram schematically showing the internal structure of a portable wireless device incorporating the inverted F antenna 40. As shown in FIG. In this case, since the inverted F antenna 40 is disposed in a direction in which the radiating element 41 is parallel to the width direction of the housing 54, only the short-circuit portion 43 is visible in FIG. Further, with respect to the radiating element 41, an end face (that is, an open end face) 41a in the extending direction is visible.

  In FIG. 26, a plating chassis (or ground shield) 52 is disposed in a housing 54 between a circuit board (main board) 50 on which the inverted F antenna 40 is mounted and a key 51. The plating chassis (or ground shield) 52 is provided for providing the key 51 on the circuit board 50 and for noise countermeasures. The ground pattern 44 described above is provided on the surface of the circuit board 50 on the inverted F antenna 40 side. In the casing 54, a circuit board 53 as a sub board is also provided in addition to the circuit board 50 as a main board.

  FIG. 27 is a view showing a state in which the housing 54 is placed on the metal plate 55. In this case, since the inverted F antenna 40 is a plate-like antenna and overlaps with the metal plate 55 in a wide area, the impedance characteristic is greatly changed and the radiation characteristic is remarkably deteriorated as compared with a rod-like or linear antenna.

Japanese Patent Laid-Open No. 2003-092510 JP 2006-245868 A JP 2007-329962 A

  However, there is a need to reduce the thickness of the portable wireless device, and by providing the plating chassis (or ground shield) 52, the distance between the circuit board 50 and the radiating element 41 of the inverted F antenna 40 has to be reduced. There is a problem that the usable frequency band becomes narrow.

  Moreover, there is a problem that adding a new part (auxiliary ground plane) for placing on a metal plate leads to an increase in cost and enlargement of the housing.

  The present invention has been made in view of such circumstances, and while reducing the thickness of a portable wireless device, it is possible to widen the distance between the circuit board and the radiating element of the inverted F antenna, and to provide a new component. An object of the present invention is to provide a portable wireless device that can obtain a good reception sensitivity even on a metal plate without adding a signal.

  The portable wireless device of the present invention includes a housing, a circuit board provided in the housing, a ground pattern formed on the circuit board, a power feeding unit provided on one end of the circuit board, A short-circuit portion provided at one end of the circuit board, an antenna element connected to the circuit board via the power feeding section and the short-circuit section, and a conductive member connected to the ground pattern, The antenna element is extended in a direction away from the power feeding unit and the short-circuit unit, and the ground pattern is configured at a position corresponding to the power feeding unit and the short-circuit unit on the circuit board. The conductive member so as to be separated from the antenna element in the thickness direction of the housing from the end of the ground pattern in the extending direction of the element to the open end of the antenna element It was placed.

  According to the above configuration, the ground corresponding to from the end of the ground pattern in the extending direction of the antenna element to the open end of the antenna element is used as a conductive member instead of the ground pattern of the circuit board. Since the antenna element is arranged so as to be separated from the antenna element in the thickness direction of the casing, the gap between the antenna element and the ground can be increased by making the most effective use of the thickness of the casing of the portable wireless device. Therefore, it is possible to widen the band by widening the distance between the circuit board and the radiating element of the inverted F antenna while reducing the thickness of the portable wireless device.

  In the above configuration, the power supply unit and the short-circuit unit are arranged in correspondence with the ground pattern from one end of the circuit board in the order of the power supply unit and the short-circuit unit, or in the order of the short-circuit unit and the power-supply unit. did.

  According to the above configuration, since the same effect can be obtained regardless of the order of arrangement of the power feeding unit and the short-circuit unit, the degree of freedom in circuit design on the circuit board can be increased.

  The said structure WHEREIN: The said electroconductive member has been arrange | positioned via the 1st connection part and 2nd connection part which are connected with the said ground pattern.

  According to the said structure, a connection part can be comprised easily using a spring and a pin.

  In the above configuration, the first connection portion is disposed in the vicinity of the power feeding portion.

  According to the above configuration, it is possible to positively distribute the high-frequency current distributed widely in the power feeding unit to the conductive member.

  The said structure WHEREIN: The said 1st connection part was connected to the said ground pattern via the reactance element.

  According to the above configuration, the impedance characteristic of the conductive member can be adjusted by the reactance element.

  The said structure WHEREIN: The said 2nd connection part was connected to the said ground pattern via the said reactance element.

  According to the above configuration, the impedance characteristic of the conductive member can be adjusted by the reactance element.

  The said structure WHEREIN: The said 1st connection part and the said 2nd connection part were connected to the said ground pattern via the reactance element.

  According to the above configuration, the impedance characteristic of the conductive member can be adjusted by the reactance element.

  In the above configuration, a switch connected to the object proximity detection device is provided, and the second connection portion is connected to the ground pattern via the switch.

  According to the above configuration, when the impedance characteristics of the antenna change significantly due to proximity of a metal conductor or high dielectric material, etc., it is identified by an object proximity detection device such as an SWR meter, and switched to a normal ground pattern by switching. It is possible to improve the impedance characteristics of the antenna by operating the conductive member as a ground line with the second connection portion being disconnected from the ground pattern and positively flowing a high-frequency current to the conductive member.

  The said structure WHEREIN: The said 1st connection part was connected to the said ground pattern via the said switch.

  According to the above configuration, when the impedance characteristics of the antenna change significantly due to proximity of a metal conductor or high dielectric material, etc., it is identified by an object proximity detection device such as an SWR meter, and switched to a normal ground pattern by switching. It is possible to improve the impedance characteristics of the antenna by operating the conductive member as the opposite ground line with the first connection portion being disconnected from the ground pattern and actively passing a high-frequency current to the conductive member.

  In the above configuration, the second connection portion is connected to the ground pattern via the switch and the reactance element.

  According to the said structure, the impedance characteristic of the electroconductive member operated as a ground wire can be adjusted with a reactance element.

  In the above configuration, the first connection portion is connected to the ground pattern through the switch and the reactance element.

  According to the said structure, the impedance characteristic of the electroconductive member operated as a ground wire can be adjusted with a reactance element.

  In the above configuration, the first connection portion is connected to the ground pattern through the reactance element.

  According to the said structure, the impedance characteristic of the electroconductive member operated as a ground wire can be adjusted with a reactance element.

  The said structure WHEREIN: The said 2nd connection part was connected to the said ground pattern via the said reactance element.

  According to the said structure, the impedance characteristic of the electroconductive member operated as a ground wire can be adjusted with a reactance element.

  In the above configuration, the electrical length of the conductive member is configured to be approximately λ / 4 of a desired frequency including the first connection portion.

  According to the said structure, it can comprise in the optimal electrical length as a ground wire, and can ensure the best impedance characteristic.

  In the above configuration, the electrical length of the conductive member is configured to be approximately λ / 4 of a desired frequency including the first connection portion and the reactance element.

  According to the said structure, it can comprise in the optimal electrical length as a ground wire, and while ensuring the best impedance characteristic, an impedance characteristic can be adjusted with a reactance element.

  The said structure WHEREIN: The said 1st connection part and the said 2nd connection part were each connected to the said ground pattern via the said switch.

  According to the above configuration, when the impedance characteristics of the antenna change significantly due to proximity of a metal conductor or a high dielectric material, the object proximity detection device identifies it, and the second connection unit is switched with a switch so that the ground pattern is not connected. The first connection unit can switch the impedance characteristic with a switch according to the situation.

  The said structure WHEREIN: The said 1st connection part and the said 2nd connection part were connected to the said ground pattern via the said switch and the said reactance element, respectively.

  According to the above configuration, when the impedance characteristics of the antenna change significantly due to the proximity of a metal conductor or high dielectric material, the object proximity detection device identifies it, and when the second connection portion is switched by the switch and the ground pattern is not connected. The first connection portion can be adjusted using the reactance element when switching the impedance characteristics with the switch according to the situation. .

  In the above configuration, the electrical length of the conductive member is configured to be approximately λ / 4 of a desired frequency including the switch and the reactance element.

  According to the said structure, it can comprise in the optimal electrical length as a ground wire, and can ensure the best impedance characteristic.

  The said structure WHEREIN: The said electroconductive member was provided with the connection part of three or more places, and was connected to the said ground pattern through the said switch and the said reactance element, respectively.

  According to the above configuration, even when the electrical length becomes long when the desired frequency is low, the potential difference between the conductive member and the ground pattern can be eliminated in the normal state where the metal conductor or the high dielectric is not close to each other. In addition, when the metal conductor or high dielectric is not close to each other, the best impedance characteristics can be ensured by switching the connection portions with switches.

  According to the present invention, a ground corresponding to the end of the antenna element from the end of the antenna pattern in the extending direction of the antenna element to the open end of the antenna element is used as a conductive member in place of the ground pattern of the circuit board. Since it is arranged so as to be separated from the antenna element in the thickness direction, the thickness of the casing of the portable wireless device can be effectively utilized to widen the distance between the antenna element and the ground. Compared to the case of using a ground pattern, the bandwidth can be increased.

It is sectional drawing for demonstrating the structure of the portable radio | wireless machine which concerns on Embodiment 1 of this invention, (a) is sectional drawing cut | disconnected in parallel with the longitudinal direction, (b) is AA 'of (a). Line sectional view, (c) is a sectional view taken along line BB 'of (a). The figure which expanded the circuit board, the reverse F antenna, and the ground metal plate in (c) of FIG. The figure which expanded the upper end part of the circuit board in (a) of FIG. 1, and also omitted the part corresponding to the antenna element of a ground pattern, and a feed part and a short circuit part. The figure which expanded the upper end part of the circuit board in (a) of FIG. Sectional drawing which shows schematic structure which provided the strap hole in the portable radio | wireless machine of FIG. The perspective view for demonstrating the structure of the portable radio | wireless machine which concerns on Embodiment 3 of this invention. The perspective view for demonstrating the structure of the portable radio apparatus etc. which concern on Embodiment 3 of this invention. The perspective view for demonstrating the structure of the portable radio apparatus which concerns on Embodiment 4 of this invention. The perspective view for demonstrating the structure of the portable radio | wireless machine which concerns on Embodiment 5 of this invention. The perspective view for demonstrating the structure of the portable radio apparatus which concerns on Embodiment 6 of this invention. The perspective view for demonstrating the structure of the portable radio apparatus which concerns on Embodiment 7 of this invention. Sectional drawing for demonstrating the structure of the portable radio apparatus which concerns on Embodiment 7 of this invention. The perspective view for demonstrating the structure of the portable radio apparatus which concerns on Embodiment 8 of this invention. The perspective view for demonstrating the structure of the portable radio | wireless machine which concerns on Embodiment 9 of this invention. The perspective view for demonstrating the structure of the portable radio apparatus which concerns on Embodiment 10 of this invention. The perspective view for demonstrating the structure of the portable radio | wireless machine which concerns on Embodiment 11 of this invention. The perspective view for demonstrating the structure of the portable radio apparatus which concerns on Embodiment 12 of this invention. The perspective view for demonstrating the structure of the portable radio apparatus which concerns on Embodiment 13 of this invention. The perspective view for demonstrating the structure of the portable radio | wireless machine which concerns on Embodiment 14 of this invention. The perspective view for demonstrating the structure of the portable radio | wireless machine which concerns on Embodiment 15 of this invention. The perspective view for demonstrating the structure of the portable radio apparatus which concerns on Embodiment 16 of this invention. The perspective view for demonstrating the structure of the portable radio | wireless machine which concerns on Embodiment 17 of this invention. The perspective view for demonstrating the structure of the portable radio apparatus which concerns on Embodiment 18 of this invention. The perspective view for demonstrating the structure of the portable radio apparatus which concerns on Embodiment 18 of this invention. The figure which shows schematic structure of a reverse F antenna The figure which showed schematically the internal structure of the portable radio | wireless machine which incorporated the inverted F antenna of FIG. The figure which showed roughly the state where the portable radio was put on the metal plate

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

(Embodiment 1)
FIG. 1 is a cross-sectional view showing a schematic configuration of a portable wireless device according to Embodiment 1 of the present invention, where (a) is a cross-sectional view cut in parallel with the longitudinal direction, and (b) is an A- A 'line sectional drawing, (c) is a BB' line sectional view of (a). The present invention can be applied to any type of portable wireless device of a straight type constituted by one case, a folding type comprising two cases, an upper case and a lower case, and a slide type. In this embodiment, a straight-type portable radio is used.

  Referring to FIG. 1, a portable wireless device 1 according to the present embodiment includes a case 2 formed in a rectangular box shape, a circuit board 3 formed in a size that can be accommodated in the case 2 without a substantial gap, and a circuit. The power feeding unit 4 provided at one end in the width direction of the substrate 3 (the upper end in FIG. 1A) and the one end in the width direction of the circuit board 3 are slightly The antenna element 6 connected to the circuit board 3 through the power feeding part 4 and the short-circuit part 5, the ground pattern 7 formed on the circuit board 3, and the ground pattern 7 And a ground sheet metal (conductive member) 8 connected thereto. The feeding unit 4, the short-circuit unit 5, and the antenna element 6 constitute an inverted F antenna 10.

  The power feeding unit 4 and the short-circuit unit 5 are arranged at corners of the circuit board 3 so that a portion with a strong antenna current can be obtained in the width direction of the housing 2 as much as possible. The antenna element 6 extends in the width direction of the casing 2, that is, in a direction away from the power feeding unit 4 and the short-circuit unit 5. The ground pattern 7 is a portion other than the portion corresponding to the power feeding portion 4 and the short-circuit portion 5 and the portion of the circuit board 3 where the inverted F antenna 10 is disposed among the portions of the circuit substrate 3 where the inverted F antenna 10 is disposed. Is formed.

  The ground metal plate 8 is disposed so as to be separated from the antenna element 6 in the thickness direction of the housing 2 from the end 7 a of the ground pattern 7 in the extending direction of the antenna element 6 to the open end 6 a of the antenna element 6. The ground metal plate 8 is used to replace the ground pattern 7 of the circuit board 3 with a ground corresponding to the end 7 a of the ground pattern 7 in the extending direction of the antenna element 6 and the open end of the antenna element 6. is there. The distance between the ground of the antenna element 6 and the ground of the antenna element 6 can be increased by the ground metal plate 8, and a wider band can be achieved compared to the case where the ground pattern 7 of the circuit board 3 is used.

  FIG. 2 is an enlarged view of the circuit board 3, the inverted F antenna 10, and the ground metal plate 8 in FIG. As shown in the figure, the ground sheet metal 8 is composed of two sheet metals 8a and 8b. The sheet metal 8a is connected to the end portion 7a of the ground pattern 7 of the circuit board 3 in a direction perpendicular to the circuit board 3, and the sheet metal 8b. Is connected to the tip of the portion 8a in a direction perpendicular to the portion 8a. The length of the sheet metal 8a is a length in which the length obtained by adding the thickness of the sheet metal 8b is substantially the same as the length from the circuit board 3 to the inner surface of the housing 2. Further, the length of the sheet metal 8 b is a length that reaches the open end 6 a of the antenna element 6 from the end 7 a of the ground pattern 7 of the circuit board 3. The ground sheet metal 8 does not necessarily have to be composed of the two sheet metals 8a and 8b, and may be formed integrally.

  FIG. 3 is an enlarged view of the upper end portion of the circuit board 3 in FIG. 1A, and further omits the portion corresponding to the antenna element 6 of the ground pattern 7, the power feeding portion 4 and the short-circuit portion 5. FIG. 4 is an enlarged view of the upper end portion of the circuit board 3 in FIG.

  Since the current concentrates at the feeding point and the short-circuit point of the inverted F antenna 10, the current is fed in the width direction of the circuit board 3 by receiving the feeding part 4 and the short-circuit part 5 by the robust circuit board 3, and the antenna element 6 By receiving the open end 6 a with the ground metal plate 8, the open end 6 a of the high-impedance antenna element 6 can be separated from the ground pattern 7 of the circuit board 3.

  As described above, according to the portable wireless device 1 of the present embodiment, the antenna in the thickness direction of the housing 2 extends from the end 7 a of the ground pattern 7 in the extending direction of the antenna element 6 to the open end 6 a of the antenna element 6. Since the ground sheet metal 8 is provided so as to be separated from the element 6, it is possible to increase the distance between the antenna element 6 and the ground by making the most effective use of the thickness of the housing 2 of the portable wireless device 1. As compared with the case of using the third ground pattern 7, a wider band can be achieved.

(Embodiment 2)
In the first embodiment, the power feeding section 4 and the short-circuit section 5 are directed from one end 3a in the longitudinal direction of the circuit board 3 to the other end 3b in the longitudinal direction (see FIG. 1, FIG. 3 or FIG. 4). Although the short circuit portion 5 and the power feeding portion 4 are arranged in this order, the effects are not changed even if they are arranged in the reverse order, and the degree of freedom of circuit design in the circuit board 3 can be increased.

  In the first embodiment, a space is obtained behind the ground metal plate 8 by providing the ground metal plate 8 at the tip of the antenna element 6 of the inverted F antenna 10. This space can be used for various purposes. FIG. 5 is a cross-sectional view showing a schematic configuration of an application example in which the strap hole 15 is provided in the space.

(Embodiment 3)
FIG. 6 is a perspective view for explaining the configuration of the portable wireless device according to the third embodiment of the present invention. In order to show the configuration of the ground sheet metal 8, the perspective view is specialized for the ground sheet metal 8. The ground metal plate 8 is connected to the ground pattern 7 at two locations of the connection portion 16a and the connection portion 16b. When actually mounted on a terminal, a spring is mounted on the ground pattern 7 to form a contact point with the ground sheet metal 8. Since increasing the number of springs leads to an increase in cost, it is desirable to have as few contacts as possible. Further, since the ground sheet metal 8 and the ground pattern 7 need to operate as the same ground with no potential difference, it is desirable to provide the connection portions at two corners of the ground sheet metal. In FIG. 6, the connecting portions are arranged side by side in the width direction of the circuit board 3, but the connecting portions may be arranged in the length direction of the circuit board 3 as shown in FIG. 7.

  The configuration of the portable wireless device according to this embodiment will be described with reference to FIG. Of the connecting part 16a (corresponding to the first connecting part in the claims) and the connecting part 16b (corresponding to the second connecting part in the claims), the connecting part 16a is always arranged close to the power feeding part 4. The connection portion 16a is preferably disposed at a location where a large amount of high-frequency current flowing through the ground pattern 7 flows. The connection portion 16a is closer to the power supply portion 4, and feeds power at least than the middle point in the width direction (short direction) of the circuit board 3. What is necessary is just to arrange | position to the point side.

(Embodiment 4)
FIG. 8 is a perspective view for explaining the configuration of the portable wireless device according to the fourth embodiment of the present invention. A reactance element 17 is disposed between the connection portion 16a and the ground pattern 7. In fact, the ground sheet metal 8 may deviate from a desired impedance characteristic when it is configured to be mounted on a portable wireless device in consideration of assembly efficiency. Therefore, by connecting to the ground pattern 7 via the reactance element 17, it is possible to correct the deviation of the impedance characteristic and to adjust the impedance characteristic to the optimum.

(Embodiment 5)
FIG. 9 is a perspective view for explaining the configuration of the portable wireless device according to the fifth embodiment of the present invention. A reactance element 17 is disposed between the connection portion 16b and the ground pattern 7. Even in this configuration, the deviation of the impedance characteristic can be corrected, and the optimum impedance characteristic can be adjusted.

(Embodiment 6)
FIG. 10 is a perspective view for explaining the configuration of the portable wireless device according to the sixth embodiment of the present invention. The reactance element 17 is disposed between the connection portion 16a and the ground pattern 7, and between the connection portion 16b and the ground pattern 7. Even in this configuration, the deviation of the impedance characteristic can be corrected, and the optimum impedance characteristic can be adjusted.

(Embodiment 7)
FIG. 11 is a perspective view for explaining the configuration of the portable wireless device according to the seventh embodiment of the present invention. The connecting portion 16b is connected to the ground pattern 7 via the switch 18. Here, an SPDT (Single Pole Double Throw) switch will be described as an example of the switch. The switch 18 has an input terminal 19, an output terminal 20a, an output terminal 20b, and a control terminal 21. The output terminal 20a is connected to the ground pattern 7, the output terminal 20b is not connected to the ground pattern 7, and the normal switch 18 connects the input terminal 19 and the output terminal 20a. On the other hand, when the metal plates are close to each other, the detection device 22 such as the SWR meter identifies when the SWR is high, and transmits a control signal to the control terminal 21, whereby the output terminal 20 a and the output terminal 20 b of the switch 18. To switch between the input terminal 19 and the output terminal 20b. Accordingly, when the metal plates are close to each other, the connection portion 16b is not connected to the ground pattern 7. Thereby, the ground sheet metal 8 is connected to the ground pattern 7 only by the connection portion 16a and operates as a ground line. As shown in FIG. 12, when the housing 2 is placed on the metal plate 23, the inverted F antenna 10 is close to the metal plate 23, but the ground metal plate 8 is located away from the metal plate 23. Good radiation characteristics can be obtained by operating 8 as a ground line and actively flowing a high-frequency current.

  The switch 18 is not limited to SPDT, and is not limited to this as long as it is a high frequency switch having an input terminal 19 and a plurality of output terminals 20.

  The detection device 22 is not limited to the SWR meter, and is not limited to this as long as it detects an object that significantly changes the impedance characteristics of the antenna, such as a metal conductor or a high dielectric material.

(Embodiment 8)
FIG. 13 is a perspective view for explaining the configuration of the portable wireless device according to the eighth embodiment of the present invention. The connecting portion 16a is connected to the ground pattern 7 via the switch 18. The output terminal 20a is connected to the ground pattern 7, the output terminal 20b is not connected to the ground pattern 7, and the normal switch 18 connects the input terminal 19 and the output terminal 20a. On the other hand, when the metal plates are close to each other, the detection device 22 such as the SWR meter identifies when the SWR is high, and transmits a control signal to the control terminal 21, whereby the output terminal 20 a and the output terminal 20 b of the switch 18. To switch between the input terminal 19 and the output terminal 20b. Accordingly, when the metal plates are close to each other, the connection portion 16a is not connected to the ground pattern 7. Thereby, the ground sheet metal 8 can be connected to the ground pattern only by the connection portion 16b, operate as an opposing ground line, and can actively obtain a high radiation characteristic by flowing a high-frequency current actively.

  The detection device 22 is not limited to the SWR meter, and is not limited to this as long as it detects an object that significantly changes the impedance characteristics of the antenna, such as a metal conductor or a high dielectric material.

(Embodiment 9)
FIG. 14 is a perspective view for explaining the configuration of the portable wireless device according to the ninth embodiment of the present invention. The connecting portion 16 b is connected to the ground pattern 7 via the switch 18 and the reactance element 17. The output terminal 20a and the output terminal 20b are connected to the ground pattern 7 by different reactance elements 17, respectively. The switch 18 has an inherent impedance characteristic. When the switch 18 is actually connected to the ground pattern 7 via the switch 18, it cannot be connected with a low impedance. The output terminal 20a is connected to the ground pattern with low impedance, and the output terminal 20b is not connected to the ground pattern with high impedance. Therefore, in order to adjust the impedance of the path from the input terminal 19 to the ground pattern 7, different reactance elements 17 are loaded on the output terminal 20a and the output terminal 20b. Thereby, even if it connects via the switch 18, a connected / disconnected state can be ensured and it can switch according to a condition.

(Embodiment 10)
FIG. 15 is a perspective view for explaining the configuration of the portable wireless device according to the tenth embodiment of the present invention. The connecting portion 16 a is connected to the ground pattern 7 via the switch 18 and the reactance element 17. The output terminal 20a and the output terminal 20b are connected to the ground pattern 7 by different reactance elements 17, respectively. In order to adjust the output terminal 20a to be connected to the ground pattern with a low impedance and the output terminal 20b to be adjusted to be disconnected from the ground pattern with a high impedance, different reactance elements 17 are loaded on the output terminal 20a and the output terminal 20b, respectively. Thereby, even if it connects via the switch 18, a connected / disconnected state can be ensured and it can switch according to a condition.

(Embodiment 11)
FIG. 16 is a perspective view for explaining the configuration of the portable wireless device according to the eleventh embodiment of the present invention. The connecting portion 16a is connected to the ground pattern 7 via the reactance element 17. Thereby, even when the desired impedance characteristic of the ground metal plate 8 is deviated, it can be corrected by the reactance element 17 and can be adjusted to the optimum impedance characteristic.

(Embodiment 12)
FIG. 17 is a perspective view for explaining the configuration of the portable wireless device according to the twelfth embodiment of the present invention. The connection portion 16b is connected to the ground pattern 7 via the reactance element 17. Thereby, even when the desired impedance characteristic of the ground metal plate 8 is deviated, it can be corrected by the reactance element 17 and can be adjusted to the optimum impedance characteristic.

(Embodiment 13)
FIG. 18 is a perspective view for explaining the configuration of the portable wireless device according to the thirteenth embodiment of the present invention. The electrical length 24 is an arrow that represents the electrical length of the ground sheet metal 8. The electrical length 24 of the ground metal plate 8 is configured to be approximately λ / 4 of the desired frequency. Thereby, it can operate | move favorably as a ground wire. Generally, the length of approximately λ / 4 of the desired frequency is about 35 mm in the 2 GHz band.

(Embodiment 14)
FIG. 19 is a perspective view for explaining the configuration of the portable wireless device according to the fourteenth embodiment of the present invention. The ground metal plate 8 is connected to the ground pattern 7 via the reactance element 17. The electrical length 24 of the ground metal plate 8 including the reactance element 17 is configured to have a length of approximately λ / 4 of a desired frequency. Should the electrical length 24 of the ground metal plate deviate from the length of approximately λ / 4 of the desired frequency, it can be adjusted by the reactance element 17 and can operate well as a ground wire.

(Embodiment 15)
FIG. 20 is a perspective view for explaining the configuration of the portable wireless device according to the fifteenth embodiment of the present invention. The ground pattern 7 is connected to both the connecting portion 16a and the connecting portion 16b via the switch 18 respectively. Thereby, both the connection part 16a and the connection part 16b can be switched.

(Embodiment 16)
FIG. 21 is a perspective view for explaining the configuration of the portable wireless device according to the sixteenth embodiment of the present invention. The ground pattern 7 is connected to both the connection portion 16a and the connection portion 16b via the switch 18 and the reactance element 17, respectively. As a result, the connection portion 16a and the connection portion 16b are normally connected to the output terminal 20a, and are connected with the impedance adjusted by the reactance element 17 and the ground pattern. Further, when the metal plates are switched close to each other, each is connected to the output terminal 20b, the connection portion 16b is disconnected with the impedance adjusted by the reactance element 17, and the connection portion 16a is the impedance adjusted by the reactance element 17. Connected at. The connecting portion 16a is always in a connected state, but has two reactance elements 17. This is because the pass characteristic of the switch 18 changes at the operating frequency, and the optimum reactance value for each frequency is different. Therefore, two reactance elements are provided in the same connection state.

  The reactance element 17 is not limited to two, but in the case of a high frequency switch having two or more output terminals such as SP3T (Single Pole Three Throw) and SP4T (Single Pole Four Throw) in addition to SPDT, the output This does not apply as long as the number of terminals corresponds to the number of reactance elements.

(Embodiment 17)
FIG. 22 is a perspective view for explaining the configuration of the portable wireless device according to the seventeenth embodiment of the present invention. In a state where the ground pattern 7 is connected to both the connection portion 16a and the connection portion 16b via the switch 18 and the reactance element 17, the electrical length 24 of the ground metal plate 8 is set to a length of approximately λ / 4 of the desired frequency. Thereby, it can operate | move favorably as a ground wire. In addition, the connecting portion 16a is always in a connected state, but the electrical length 24 differs at the operating frequency. Therefore, two reactance elements 17 are provided, and the reactance elements 17 are switched and adjusted so that the optimum electrical length 24 is obtained at the operating frequency.

(Embodiment 18)
FIG. 23 is a perspective view for explaining the configuration of the portable wireless device according to the eighteenth embodiment of the present invention. Three connection portions are provided, and each is connected to the ground pattern 7 via the switch 18 and the reactance element 17. Although there is means for adjusting the electrical length 24 by the reactance element 17, generally the length of approximately λ / 4 of the desired frequency is about 90 mm in the 800 MHz band, about 50 mm in the 1.5 GHz band, The more the frequency band is expanded to about 40 mm in the 0.7 GHz band and about 35 mm in the 2 GHz band, the more the difference in the optimum electrical length 24 occurs, and the adjustment by the reactance element 17 alone becomes impossible. Therefore, the electrical length 24 can be switched by disconnecting the ground pattern 7 from the connecting portion 16c and the connecting portion 16b in FIG. 23 and disconnecting only the connecting portion 16c from the ground pattern 7 in FIG. As described above, by providing a large number of connection portions 16a (16b, 16c), switches 18, and reactance elements 17, it is possible to deal with more frequencies.

  The number of the connecting portions 16a (16b, 16c), the switches 18, and the reactance elements 17 is not limited to three.

  The present invention is of course applicable not only to mobile phones but also to wireless devices such as PDAs (Personal Digital Assistants) and transceivers having communication functions.

  The present invention can widen the distance between the circuit board and the radiating element of the inverted-F antenna while reducing the thickness of the portable wireless device, and in addition, even when placed on a metal desk. The ground sheet metal connection conditions can be switched to operate as a ground wire to improve radiation characteristics, and can be applied to a portable wireless device such as a cellular phone.

DESCRIPTION OF SYMBOLS 1 Portable radio 2 Case 3 Circuit board 4 Feeding part 5 Short circuit part 6 Antenna element 6a Open end of antenna element 7 Ground pattern 7a End part of ground pattern 8 Ground metal plate 10 Reverse F antenna 15 Strap hole 16a, 16b, 16c Connection Unit 17 Reactance element 18 Switch 19 Input terminal 20a, 20b Output terminal 21 Control terminal 22 Detector 23 Metal plate 24 Electric length

Claims (19)

A housing,
A circuit board provided in the housing;
A ground pattern configured on the circuit board;
A power feeding unit provided at one end of the circuit board;
A short circuit provided at one end of the circuit board;
An antenna element connected to the circuit board through the power feeding unit and the short-circuit unit;
A conductive member connected to the ground pattern,
The antenna element is extended in a direction away from the feeding portion and the short-circuit portion,
In the circuit board, the ground pattern is configured at a position corresponding to the power feeding unit and the short-circuit unit,
A portable wireless device in which the conductive member is disposed so as to be separated from the antenna element in the thickness direction of the casing from the end of the ground pattern in the extending direction of the antenna element to the open end of the antenna element.   The power supply unit and the short-circuit unit are arranged in correspondence with the ground pattern from one end of the circuit board in the order of the power supply unit and the short-circuit unit, or in the order of the short-circuit unit and the power-supply unit. Item 2. The portable wireless device according to Item 1.   The portable wireless device according to claim 1 or 2, wherein the conductive member is connected via a first connection portion and a second connection portion that are connected to the ground pattern.   The portable wireless device according to claim 3, wherein the first connection unit is provided in the vicinity of the power feeding unit.   The portable wireless device according to claim 4, wherein the first connection unit is connected to the ground pattern via a reactance element.   The portable wireless device according to claim 3, wherein the second connection unit is connected to the ground pattern via the reactance element.   The portable wireless device according to claim 5 or 6, wherein the first connection portion and the second connection portion are connected to the ground pattern via the reactance element. It has a switch connected to the object proximity detector,
The portable wireless device according to claim 4, wherein the second connection unit is connected to the ground pattern via the switch.   The portable wireless device according to claim 8, wherein the first connection unit is connected to the ground pattern via the switch.   The portable wireless device according to claim 8, wherein the second connection unit is connected to the ground pattern via the switch and the reactance element.   The portable wireless device according to claim 9, wherein the first connection unit is connected to the ground pattern via the switch and the reactance element.   The portable wireless device according to claim 8, wherein the first connection unit is connected to the ground pattern via the reactance element.   The portable wireless device according to claim 9, wherein the second connection unit is connected to the ground pattern via the reactance element.   The portable wireless device according to claim 8, wherein an electrical length of the conductive member is configured to be approximately λ / 4 of a desired frequency including the first connection portion.   The portable wireless device according to claim 12, wherein the electrical length of the conductive member is configured to be approximately λ / 4 of a desired frequency including the first connection portion and the reactance element.   The portable wireless device according to claim 8 or 9, wherein each of the first connection unit and the second connection unit is connected to the ground pattern via the switch.   The portable wireless device according to claim 16, wherein the first connection portion and the second connection portion are connected to the ground pattern via the switch and the reactance element, respectively.   The portable wireless device according to claim 17, wherein an electrical length of the conductive member is configured to be approximately λ / 4 of a desired frequency including the switch and the reactance element.   3. The portable wireless device according to claim 1, wherein the conductive member includes three or more connection portions, and is connected to the ground pattern via the switch and the reactance element, respectively.

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