JP2007096976A - Wireless device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To relieve a concentration of return current in the vicinity of feeding point of antenna 1 in a wireless device equipped with a plurality of antennas without limiting the usage of casing materials, or adding parts. <P>SOLUTION: The wireless device 1 comprises a first casing 11, a second casing 12, and a connection part 13, and is equipped with a first antenna 21 on an upper part of a substrate 15 built in the second casing 12, and a second antenna 23 on a lower part thereof. Both the feeding point 22 of the first antenna 21 and a ground point 24 of the second antenna 23 are provided near a long side 16 of the substrate 15. The return current of the first antenna 21 is distributed over a total electric length of the second antenna 23 from the feeding point 22 through the ground point 24. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radio apparatus, and more particularly to a radio apparatus provided with at least two antennas.

  The antennas of wireless devices are roughly classified into types that are balanced and fed unbalanced. In a small wireless device such as a cellular phone, it is generally difficult to employ a balanced power supply type antenna such as a dipole antenna due to size restrictions, and therefore an unbalanced power supply type antenna is often used. However, in an unbalanced power supply type antenna, a return current flows from the feeding point to the grounding circuit of the wireless device (the conductive part of the housing or the grounding pattern of the built-in substrate), and the wireless device (particularly the portion from the feeding point to the grounding circuit). However, there is a problem in that radiation efficiency tends to be lowered due to proximity to the human body in a call state.

  In many mobile phones, an antenna feeding point is provided at a position close to one short side of a substrate built in a case (one of which is formed by connecting two cases). . Then, the return current flows from the feeding point toward the other short side. The value of the return current is maximum at the feeding point and is extremely small on the short side far from the feeding point. As the return current concentrates in the vicinity of the feeding point and the maximum value is larger, the reduction in radiation efficiency becomes more conspicuous. Therefore, mitigating the return current concentration is effective for improving the radiation efficiency.

  A technique for alleviating such concentration of return current is conventionally known (see, for example, Patent Document 1). In the technique disclosed in Patent Document 1, an inverted F-type antenna is built in a casing of a portable wireless device (for example, a foldable mobile phone), and a main surface (for example, a display unit and a receiving unit are attached to the casing). In this case, the return current of the inverted F-type antenna is dispersed over the entire main surface by forming the surface) with a conductive member or an insulating member with the inner surface plated with a conductive material.

On the other hand, there is also known a technique for reducing a return current flowing through a ground pattern on a substrate to prevent a decrease in radiation efficiency (see, for example, Patent Document 2). In the technique disclosed in Patent Document 2, a conductor (for example, a strip-shaped, crank-shaped metal) is provided in the vicinity of a feeding point on a board surface opposite to a radio circuit side in a radio apparatus that feeds an antenna from a radio circuit provided on the board. The return current flowing through the ground pattern is reduced by attaching a plate) and causing the return current to flow sideways.
JP 2004-229141 A (2nd, 5th page, FIG. 2) JP 2003-69442 A (2nd, 4th page, FIG. 1)

  All of the conventional techniques disclosed in Patent Document 1 or Patent Document 2 described above are intended to solve the problem by the configuration of the ground circuit of a single antenna. On the other hand, the latest wireless devices such as mobile phones are often provided with a plurality of antennas as functions become more sophisticated and diversified. In addition to the diversity configuration with two or more antennas for the purpose of the original wireless communication, it also supports different types of wireless systems (for example, short-range wireless links such as wireless LAN and Bluetooth, or GPS). Includes one with an antenna.

  In a radio apparatus having a plurality of antennas, there is a possibility of a solution means of using the other antenna to improve the radiation efficiency of one antenna. In that case, the radiation efficiency can be improved without considering the restrictions on the housing material and the addition of parts required in the above-described conventional technology.

  The present invention has been made to solve the above problem, and an object of the present invention is to provide a radio apparatus capable of improving the radiation efficiency of one of a plurality of antennas using another antenna.

  In order to achieve the above object, a wireless device of the present invention includes at least one long side, one short side, and a substrate having a ground pattern provided along the long side, and the long side of the substrate. A first antenna fed unbalanced from a feed point provided near the side, and a ground point provided near the short side and closer to the short side than the long side of the substrate. And a second antenna connected to the ground pattern and having an electrical length longer than a distance from the ground point to the short side.

  According to the present invention, the path length of the return current of the first antenna includes the second antenna to extend the path length, thereby reducing the concentration of the return current in the vicinity of the feeding point of the first antenna and improving the radiation efficiency. Can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  The first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram illustrating the configuration of the wireless device 1 according to the first embodiment of the invention. The wireless device 1 is a two-case connection type mobile phone, and is configured such that a first case 11 and a second case 12 are connected to each other via a connecting portion 13 so as to be opened and closed.

  FIG. 1 shows a substrate 15 built in the second housing 12. The substrate 15 has at least a long side 16 and a short side 17. In FIG. 1, the substrate 15 is drawn so as to be substantially rectangular, but it is not necessarily required to be rectangular. The long side 16 and the short side 17 are formed substantially in a straight line, but may include some unevenness or a curved part. The substrate 15 has a ground pattern (not shown) provided along the long side 16. Other portions of the substrate 15 may be provided with a ground pattern.

  A first antenna 21 is provided above the substrate 15. The first antenna 21 is fed from a first feeding point 22 provided at a position near the long side 16 of the substrate 15. In FIG. 1, the first antenna 21 is an inverted L-type monopole antenna built in the second housing 12. However, the present invention is not limited to this, and any unbalanced feed type antenna may be used. 2 The structure of being pulled out of the housing 12 may be used.

  A second antenna 23 is provided below the substrate 15. The second antenna 23 has a grounding pattern provided along the long side 16 at a grounding point 24 provided near the long side 16 of the substrate 15 and closer to the short side 17 than the feeding point 22. Connected. In FIG. 1, the second antenna 23 is an inverted F-type antenna built in the second housing 12, but the present invention is not limited to this, and an antenna having a ground end (one that is grounded via a matching element). As long as it is included). The second antenna 23 is fed from a second feeding point 25 provided on the substrate 15 and has an open end 26.

  The second antenna 23 is provided as an antenna for a wireless system different from the first antenna 21, for example. The second feeding point 25 represented by a broken line does not function as a feeding point when the wireless system is not operating, and the second antenna 23 is in a non-feeding state and connected to the second feeding point 25 It becomes a shape opened. The wireless device 1 includes a wireless unit, a processing unit, a display unit, an operation unit, and the like (not shown) in addition to the above-described configuration, and description thereof will be omitted.

  In the configuration of the wireless device 1 described above, the return current of the first antenna 21 has a large portion following the ground pattern provided along the long side 16 from the first feeding point 21 and a smaller portion other than the other ground. It follows the pattern and flows toward the short side 17. If the second antenna 23 does not exist, the return current flowing along the ground pattern provided along the long side 16 has a very small value on the short side 17 compared to the value on the first feeding point 21. The values are distributed as shown. On the other hand, as shown in FIG. 1, when the second antenna 23 is present, the return current further passes through a distance corresponding to the electrical length of the second antenna 23 from the ground point 24 at the first feeding point 21. The values are distributed so that the values are very small compared to the values.

  The electrical length of the second antenna 23 will be described with reference to FIG. FIG. 2A is a diagram illustrating the electrical length when the second antenna 23 is in a non-powered state. The configurations denoted by reference numerals 16, 17 and 23 to 26 in the figure correspond to the configurations denoted by the same reference numerals in FIG.

  A solid arrow in the figure represents a return current of the first antenna 21. The electrical length when the second antenna 23 is the above-described inverted F-type antenna in a non-feed state is a path length from the ground point 24 to the open end 26 until it reaches the feed point 25. The return current of the first antenna 21 that has flowed along the long side 16 does not have a very small value when it reaches the short side 17 and further flows along the electrical length. In addition, for example, when the second antenna 23 is an inverted L-type antenna from the ground point 24 to the open end 26, the electrical length is equal to the path length from the ground end 24 to the open end 26.

  FIG. 2B is a diagram illustrating a case where the second antenna 23 is fed from the second feeding point 25 for comparison with FIG. The broken arrow represents the antenna current of the second antenna 23 in that case. The return current of the first antenna 21 that has flowed along the long side 16 takes a very small value when the short side 17 is reached, and only a small amount of remaining current flows along the short side 17. .

  When the electrical length of the second antenna 23 is longer than the distance from the ground point 24 to the short side 17, the return current of the first antenna 21 flowing along the ground pattern provided along the long side 16 is The values are distributed over a longer path length than when two antennas 23 are not present. As a result, the value of the return current in the vicinity of the first feeding point 22 is lower than when the second antenna 23 is not present. As a result, the concentration of the return current in the vicinity of the first feeding point 22 is alleviated, and an improvement in the radiation efficiency of the first antenna 21 is expected.

  A numerical example representing the degree of relaxation of current concentration in the vicinity of the first feeding point 22 is calculated for a similar configuration, and will be described with reference to FIGS. FIG. 3 is a diagram for explaining the conditions used for the calculation of the numerical example, and the unit of the number representing the length in the figure is millimeter (mm). In the figure, reference numeral 31 denotes a first substrate, and reference numeral 32 denotes a second substrate. Each case of a virtual two-case-connected mobile phone (the two cases are opened at 180 degrees). Simulates a board built into the body. The first substrate 31 has a rectangular shape with a length of 80 mm and a width of 40 mm. The same applies to the second substrate 32. The distance between the lower short side of the first substrate 31 and the upper short side of the second substrate 32 is 10 mm.

  A first antenna 33 is provided between the first substrate 31 and the second substrate 32. The first antenna 33 is an inverted L-type monopole antenna and is fed from a first feeding point 34 located on the left long side of the second substrate 32 and at a position 5 mm from the upper short side. The length of the vertical portion of the first antenna 33 is 10 mm, and the length of the horizontal portion is 40 mm.

  A second antenna 35 is provided below the second substrate 32. The second antenna 35 has an inverted L shape, and one end is grounded at a ground point 36 located at the lower left corner of the second substrate 32 and the other end is open. The length of the vertical portion of the second antenna 35 is 10 mm, and the length of the horizontal portion is 20 mm.

  According to the configuration described above, the return current of the first antenna 33 that flows along the ground pattern provided along the left long side of the second substrate 32 has a longer path length than the case where the second antenna 35 is not present. The value is distributed over. As a result, the value of the return current in the vicinity of the first feeding point 34 is lower than when the second antenna 35 is not present.

  The result of the numerical calculation regarding this point will be described with reference to FIG. FIG. 4 is a diagram showing the degree of current concentration relaxation in the vicinity of the first feeding point 34 due to the addition of the second antenna 35 by numerical calculation, and reference numerals 32, 34, 35 and 36 in the figure are common to FIG. 4, the first feeding point 34 and the portion of the second substrate 32 below the first feeding point 34 and the second antenna 35 shown in FIG. 3 are viewed from the left hand side in FIG. 3. Represents. However, the second antenna 35 represents the total electrical length from the ground point 36 to the open end as well as the vertical portion in FIG.

  The solid curve drawn on the left side of the above configuration represents the distribution of return current when the second antenna 35 is not present. The frequency is 1.35 GHz which is the resonance frequency of the first antenna 33 (the length of the rising portion from the second substrate 32 is added to the length of the first antenna 33 in the vertical direction and the horizontal direction). The total length of the first antenna 33.) The horizontal distance from each position of the first feeding point 34 or the second substrate 32 or the second antenna 35 to the curve of the solid line corresponds to the relative value of the return current at that position.

  The dotted curve drawn on the left side of the above configuration represents the distribution of return current when the second antenna 35 is present. The frequency is 1.5 GHz. The horizontal distance from each position of the first feeding point 34 or the second substrate 32 or the second antenna 35 to the dotted curve corresponds to the relative value of the return current at that position. The relative value of the return current is expressed based on a common scale between the case where the second antenna 35 is not present and the case where it is present.

  As indicated by the dotted curve in FIG. 4, the return current of the first antenna 33 is distributed over the entire electrical length of the second antenna 35 from the first feeding point 34 through the ground point 36 when the second antenna 35 is present. To do. As a result, the current distribution at the first feeding point 34 is lower than when the second antenna 35 is not present (solid curve) (the difference is shown in “Decrease in current distribution concentration” in FIG. 4). It is expected to contribute to improving the radiation efficiency of the first antenna 33 by relaxing the current distribution concentration.

  Under the conditions shown in FIG. 3, the first feeding point 34 and the ground point 36 are both on the left long side of the second substrate 32. To what extent these positions are moved toward the inside of the second substrate 32, whether the effect of reducing the current distribution concentration is not lost is confirmed by a numerical example, and will be described with reference to FIGS. To do. FIG. 5 is a diagram for explaining the conditions used for the calculation of the numerical example, and the unit of the number representing the length in the figure is millimeter (mm).

  The configurations denoted by reference numerals 31 and 32 in FIG. 5 correspond to the configurations denoted by the same reference numerals in FIG. The first antenna 33A provided between the first substrate 31 and the second substrate 32 has the same shape and size as the first antenna 33 in FIG. 4 and the first feeding point 34A located inside the second substrate 32. Power is supplied from The first feeding point 34A is located 5 mm below the upper short side of the second substrate 32, and the distance from the left long side is D1.

  The second antenna 35A is a monopole antenna having the same electrical length of 30 mm as that of the second antenna 35 in FIG. 3, and is not a reverse L type but a straight line for easy calculation. The ground point 36A of the second antenna 35A is located on the lower short side of the second substrate 32, and the distance from the left long side is D2.

  An example of the result of calculating the return current distribution of the first antenna 33A under the above-described conditions is shown in FIG. FIG. 6A shows the distribution along the long side of the second substrate 32 of the return current of the first antenna 33A when D1 = 0 in FIG. 5 and the second antenna 35A is not provided. FIG. 6B shows the distribution of the return current when D1 = 0 and the second antenna 35A is provided and D2 = 0. FIG. 6C shows the distribution of the return current when D1 = 0 and the second antenna 35A is provided and D2 = 10 mm. FIG. 6D shows the return current distribution when D1 = 0 and the second antenna 35A is provided and D2 = 15 mm.

  In the case of FIG. 6A in which the second antenna 35A is not provided, the return current takes a very small value at the left corner of the short side on the lower side of the second substrate 32. In the case of FIG. 6B in which the second antenna 35A is provided at a location where D2 = 0, the value of the return current at the same location increases. In the case of FIG. 6C in which the second antenna 35A is provided at a location where D2 = 10 mm, the value of the return current at the same location is not much different from the case of FIG. In the case of FIG. 6D in which the second antenna 35A is provided at a location where D2 = 15 mm, the value of the return current at the same location is not much different from the case of FIG. As a result, it can be seen that the drop in the return current distribution value at the first feeding point 34A is clearly in the range of D2 ≦ 10 mm compared to the case where the second antenna 35A is not present.

  Even when the same calculation is performed by changing the value of D1, it is clear that the return current distribution value at the first feeding point 34A is lower than that when the second antenna 35A is not present. D1 ≦ 10 mm Range. This corresponds to a case where D1 and D2 are each equal to or less than a quarter of the length of the lower side of the second substrate 32.

  According to the first embodiment of the present invention, the current concentration in the vicinity of the feeding point can be reduced by extending the path length by including other antennas in the return current path of the antenna.

  Hereinafter, Embodiment 2 of the present invention will be described with reference to FIG. FIG. 7 is a diagram illustrating the configuration of the wireless device 2 according to the second embodiment of the invention. The wireless device 2 is obtained by adding a switch to be described later to the wireless device 1 described in the first embodiment, and the configurations denoted by reference numerals 11 to 25 correspond to the configurations denoted by the same reference numerals in FIG. Is omitted. A switch 27 is inserted between the second antenna 23 and the second feeding point 25 to open and close the feeding to the second antenna 23.

  Reference numeral 28 denotes a control unit that controls the operation of the wireless device 2 and is configured by a processing device such as a microprocessor. Reference numeral 29 denotes a transmission / reception (RF) unit for the first wireless system. Reference numeral 30 denotes a transmission / reception (RF) unit for the second wireless system.

  Here, the first antenna 21 is fed from the first feeding point 22 connected to the RF unit 29 for the first wireless system as the antenna for the first wireless system, and the second antenna 23 is the second wireless system. It is assumed that power is fed from a second feeding point 25 connected to the RF unit 30 for the second wireless system as an antenna for use. In addition, the control unit 28 switches operations related to these two systems, and controls to open the switch 27 when operating the first wireless system and to close the switch 27 when operating the second wireless system. Shall.

  Then, when the wireless device 2 is performing an operation related to the first wireless system, the switch 27 is opened to disconnect the second antenna 23 from the second feeding point 25 and the first antenna 22 related to the first wireless system. Can be used as part of the return current path. In that case, the same effect as described in the first embodiment is exhibited. When switching so that the wireless device 2 performs an operation related to the second wireless system, the switch 27 may be closed and the second antenna 23 may be connected to the second feeding point 25.

  The wireless device 2 is, for example, a mobile phone that incorporates a short-range wireless link function. In that case, the first radio system is used for a cellular phone, and the second radio system is used for a short-range radio link. In the initial state after the power of the wireless device 2 is turned on, the first wireless system is operating and the second wireless system is stopped. In this state, the switch 27 is opened, and the second antenna 23 is used as a part of the return current path of the first antenna 22.

  When a predetermined operation (for example, a long press of a specific key) is performed via an operation unit (not shown in FIG. 7) of the wireless device 2, the switch 27 is closed and the second wireless system is activated. In this case, the first wireless system may be stopped or operating, but when operating, the second antenna 23 is fed from the second feeding point 25 and the return of the first antenna 22 is performed. Not included in the current path.

  According to the second embodiment of the present invention, there is an additional effect that the second antenna can be selectively used for its original use and the purpose of alleviating the return current concentration of the first antenna.

  The third embodiment of the present invention will be described below with reference to FIGS. FIG. 8 is a diagram illustrating the configuration of the wireless device 3 according to the third embodiment of the invention. The wireless device 3 is obtained by changing the configuration of the second antenna 23 and its surroundings of the wireless device 2 described in the second embodiment, and the configurations denoted by reference numerals 11 to 22 and 28 to 30 are the same in FIG. Since it corresponds to the structure which attached | subjected the code | symbol, description is abbreviate | omitted.

  In FIG. 8, the second antenna 41 is provided below the substrate 15. One end of the second antenna 41 is opened, and the other end is connected to a switch 43 provided at a ground point 42 in the substrate 15. The switch 43 switches between a ground state in which the second antenna 41 is connected to the ground pattern of the substrate 15 and a power supply state in which the second antenna 41 is connected to a second feeding point 44 provided on the substrate 15 as an inverted L-type monopole antenna.

  Here, the first antenna 21 is fed from the first feeding point 22 connected to the RF unit 29 for the first radio system as the antenna for the first radio system, and the second antenna 41 is the second radio system. It is assumed that power is fed from a second feeding point 44 connected to the RF unit 30 for the second wireless system as an antenna for use. Further, the control unit 28 switches the operation related to these two systems, switches the switch 43 to the ground state when operating the first radio system, and switches the switch 43 to the power supply state when operating the second radio system. It shall be controlled to switch to

  Then, when the wireless device 3 is performing an operation related to the first wireless system, the switch 43 disconnects the second antenna 41 from the second feeding point 44 and grounds it (grounded state), and connects to the first wireless system. The first antenna 21 can be used as a part of the return current path. In that case, the same effect as described in the first embodiment is exhibited. When switching so that the radio | wireless apparatus 3 performs the operation | movement which concerns on a 2nd radio | wireless system, what is necessary is just to connect the 2nd antenna 41 to the 2nd feeding point 44 by the switch 43 (feeding state).

  FIG. 9A is a diagram illustrating a configuration of the wireless device 4 in which the type of the second antenna is changed in the third embodiment. The wireless device 4 is obtained by changing the configuration of the second antenna 41 and its surroundings of the wireless device 3 described above, and the components denoted by reference numerals 11 to 22 and 28 to 30 are denoted by the same reference numerals in FIG. The description is omitted because it corresponds to the configuration.

  In FIG. 9A, the second antenna 51 is provided inside the substrate 15. The second antenna 51 is a type of antenna that is configured in a spiral shape and communicates with the outside via a magnetic flux penetrating the inside thereof. For example, the second antenna 51 is used when the wireless device 4 functions as a kind of electronic identification tag. It is assumed that One end of the second antenna 51 is connected to a switch 53 provided at a ground point 52 in the substrate 15. The switch 53 switches between a ground state in which the second antenna 51 is connected to the ground pattern of the substrate 15 and a power supply state in which the second antenna 51 is connected to a second feeding point 54 provided on the substrate 15 as a spiral antenna.

  The second antenna 51 may be provided on a sub-board attached in parallel to the board 15. FIG. 9B is a diagram illustrating an example of such a configuration as viewed from the side. Reference numeral 37 denotes a sub-board provided in parallel to the board 15 (not shown in FIG. 9A), and is attached to the board 15 by a spacer or the like (not shown). A second antenna 51 is formed in a spiral shape on the sub-board 37, and is connected to the ground point 52 or the second feeding point 54 via the switch 53 on the board 15.

  In FIG. 9A, the first antenna 21 is fed from the first feeding point 22 connected to the RF unit 29 for the first wireless system as the antenna for the first wireless system, and the second antenna 51 is the first antenna. It is assumed that power is fed from a second feeding point 54 connected to the RF unit 30 for the second wireless system as an antenna for the second wireless system (for example, the above-described electronic identification tag). In addition, the control unit 28 switches the operation related to these two systems, switches the switch 27 to the ground state when operating the first radio system, and switches the switch 27 to the power supply state when operating the second radio system. It shall be controlled to switch to

  Then, when the wireless device 4 is performing an operation related to the first wireless system, the switch 53 disconnects the second antenna 51 from the second feeding point 54 and grounds it (grounded state), so that the first wireless system is connected. The first antenna 21 can be used as a part of the return current path. In that case, the same effect as described in the first embodiment is exhibited. When switching so that the radio | wireless apparatus 4 performs the operation | movement which concerns on a 2nd radio | wireless system, what is necessary is just to connect the 2nd antenna 51 to the 2nd feeding point 54 with the switch 53 (power feeding state).

  According to the third embodiment of the present invention, there is an additional effect that the second antenna that takes various forms can be selectively used for its original use and the purpose of alleviating the return current concentration of the first antenna.

  In the description of the first to third embodiments, the casing configuration of the wireless device, the type and shape of the first antenna or the second antenna, the shape and size of the substrate, and the like are examples, and do not depart from the gist of the present invention. Various variations are possible in the range.

The figure showing the structure of the radio | wireless apparatus which concerns on Example 1 of this invention. (A) is a figure explaining the electrical length in case the 2nd antenna which concerns on Example 1 is in a non-power feeding state, (b) is a figure showing the case where a 2nd antenna is fed for comparison. The figure showing the conditions of the numerical calculation regarding relaxation of the return current concentration in Example 1. FIG. The figure showing the degree of return current concentration relaxation in Example 1 by numerical calculation. The figure showing the condition of the numerical calculation which concerns on the relationship between the 2nd antenna attachment position of Example 1, etc. and an effect. The figure showing the result of the numerical calculation which concerns on the relationship between the 2nd antenna attachment position of Example 1, and an effect. The figure showing the structure of the radio | wireless apparatus which concerns on Example 2 of this invention. The figure showing the structure of the radio | wireless apparatus which concerns on Example 3 of this invention. (A) is a figure showing the structure of the radio | wireless apparatus which concerns on Example 3, and changed the kind of 2nd antenna, (b) is a side view of the part of a 2nd antenna among them.

Explanation of symbols

1, 2, 3, 4 Wireless device 11 First housing 12 Second housing 13 Connecting portion 15 Substrate 16 Long side 17 Short side 21, 33, 33A First antenna 22, 34, 34A First feeding point 23, 35 , 35A, 41, 51 Second antenna 24, 36, 36A, 42, 52 Ground point 25, 44, 54 Second feed point 26 Open end 27, 43, 53 Switch 28 Control unit 29 Transmission / reception for the first wireless system (RF) unit 30 Transmission / reception (RF) unit 31 for the second wireless system 31 First substrate 32 Second substrate 37 Sub substrate

In order to achieve the above object, a wireless device of the present invention includes a first housing, a second housing coupled to the first housing so as to be openable and closable, and the second housing. A substrate having a long side and a short side adjacent to each other, and a grounding pattern provided along at least the long side, and one end of the long side closer to the first housing A first antenna fed unbalanced from a feeding point provided in the vicinity, and a second antenna having a grounding end with the grounding pattern in the vicinity of one end of the long side far from the feeding point. It is characterized by that.

In order to achieve the above object, a wireless device of the present invention includes a first housing, a second housing coupled to the first housing so as to be openable and closable, and the second housing. A substrate having a long side and a short side adjacent to each other, and a grounding pattern provided along at least the long side, and one end of the long side closer to the first housing A first antenna that is unbalanced from a first feeding point provided in the vicinity, can be unbalanced at one end, or can be grounded at a grounding point in the grounding pattern near the long side A second antenna having an open end and having an electrical length greater than an electrical length between the ground point and one end of the long side far from the first feeding point; and the second antenna Is unbalanced from a second feeding point provided on the substrate, and Characterized by comprising an antenna state switching means for switching between a state to be grounded at the ground point.

Claims (4)

A substrate having a long side and a short side adjacent to each other, and a ground pattern provided at least along the long side;
A first antenna fed unbalanced from a feeding point provided in the vicinity of the long side;
A radio apparatus comprising: a second antenna having a ground end with the ground pattern in the vicinity of one end of the long side farther from the feeding point. A substrate having a long side and a short side adjacent to each other, and a grounding pattern provided at least along the long side;
A first antenna fed unbalanced from a feeding point provided in the vicinity of the long side;
A second antenna having a grounding end and having an electrical length viewed from the grounding end at the time of non-feeding is a predetermined value;
The sum of the electrical length from the feeding point to the grounding end and the electrical length of the second antenna at the time of non-feeding is far from the feeding point on the long side near the long side. A wireless device, wherein the grounding end is arranged at a position longer than an electrical length to one end of the other side. A substrate having a long side and a short side adjacent to each other, and a grounding pattern provided at least along the long side;
A first antenna fed unbalanced from a first feeding point provided in the vicinity of the long side;
A monopole-type second antenna that can be fed from a second feed point in the vicinity of one end of the long side far from the feed point;
Antenna state switching means for switching between a feeding state where the second antenna is fed from the second feeding point and a grounding state where the second antenna is grounded to the grounding pattern is located near the one end. A wireless device. A first substrate having a long side and a short side adjacent to each other, and at least a ground pattern provided along the long side;
A second substrate provided facing the second substrate;
A first antenna fed unbalanced from a feeding point provided in the vicinity of the long side;
A second antenna having a grounding end on the first substrate and formed on the second substrate and having an electrical length from the grounding end at the time of non-feeding having a predetermined value;
The sum of the electrical length from the feeding point to the grounding end and the electrical length of the second antenna at the time of non-feeding is far from the feeding point on the long side near the long side. A wireless device, wherein the grounding end is arranged at a position longer than an electrical length to one end of the other side.

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