JP2006245868A - Antenna device and wireless apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna device capable of ensuring appropriate antenna characteristics in accordance with the usage pattern of a wireless apparatus and being made small in size and low in profile. <P>SOLUTION: Two radiation elements are configured such that feeding applied to the two radiation elements is freely switched, the radiation element to which no feeding is applied is connected to ground, and the grounded radiation element is used for a ground conductor of the radiation element to which feeding is applied so that the switching of the two radiation elements is attained without the need for extending a distance between the radiation elements and a circuit board thereby decreasing a region mounted with the radiation elements of the antenna. The antenna characteristic proper to the operating form of the wireless apparatus can be ensured by switching the two radiation elements in response to a form of the wireless apparatus when the wireless apparatus is in use. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a radio apparatus and an antenna apparatus used for the radio apparatus, and more particularly to an antenna apparatus including a plurality of radiating elements.

  A portable radio apparatus typified by a cellular phone is required to have an antenna built in the housing in order to meet the demand for convenience and design. For example, a linear antenna or a plate antenna is known as an antenna that can be built in the housing, and in general, a plate antenna is often used in view of transmission and reception characteristics.

  As a plate-like antenna, for example, an inverted F antenna having a short-circuit portion in the vicinity of the feeding point position is known. In addition, the structure which formed the loop antenna in planar shape is also known. FIG. 18 is a diagram for explaining the outline of a conventional antenna device. 18A and 18B, the antenna 201 has a radiating element 204 installed at one end of the circuit board 202 at a predetermined distance H from the circuit board surface, and the circuit board 202 is placed on the radiating element 204. Power is supplied from a power supply point 205 of an RF circuit (high frequency circuit) 203 provided above, and the circuit board 202 is used as a ground.

  The reason for the arrangement shown in FIG. 18 is that a circuit board is arranged between the radiating element and the human head during a call, and the radiating surface from the radiating element is arranged on the side opposite to the human head side. The point which can reduce the influence on the antenna characteristic by a head is mentioned.

  Portable wireless devices such as mobile phones are required to be small and thin. To achieve this reduction in size and thickness, it is desirable that the distance between the circuit board and the radiating element is small. However, if the distance between the circuit board and the radiating element is reduced, the radiation resistance decreases and the antenna efficiency deteriorates. However, there is a problem that the bandwidth is narrowed. Therefore, there is a limit to reducing the distance between the circuit board and the radiating element, and it is difficult to reduce the size and thickness of the antenna device and the wireless device on which the antenna device is mounted.

  In response to such a requirement, it is conceivable to arrange and switch a plurality of radiating elements. 18C and 18D show configuration examples in which a plurality of radiating elements 204A and 204B are arranged on a circuit board. In this configuration, the radiating element 204A is disposed on one facing surface of the circuit board 202, the radiating element 204B is disposed on the other facing surface, and antenna characteristics suitable for the use form are obtained by selecting one of them. is there. However, in the above configuration, since the two radiating elements 204A and 204B need to be separated from the circuit board 202 by a predetermined distance H, the antenna apparatus requires a total distance of 2H, and is reduced in size and thickness. There is a problem that the request cannot be satisfied.

  Also, mobile phones are not limited to calls, and image data including characters such as e-mails and web browsing are transmitted and received. In addition to the antenna characteristics in a call state, the antenna characteristics when transmitting and receiving image data are also considered. There is a need to.

  For example, Patent Documents 1 and 2 have been proposed as attempts to secure an antenna gain according to the usage mode of the portable wireless device.

  The foldable portable wireless device includes two housings that are foldably connected by a hinge mechanism. As one aspect of securing the antenna gain, a high antenna gain can be obtained depending on the use form of the portable wireless device such as opening and closing of the housing and approaching of the human body among these antennas. An antenna selection has been proposed.

  Also, as another aspect, by arranging two antennas in parallel in one housing, a directional diversity effect is obtained, and the power supply to the antenna is switched on the circuit board on the other housing side. In order to obtain a high antenna gain even when held with either the left hand or the right hand in a call state, there has been proposed.

However, in the conventional configuration described above, in order to secure the characteristics of each antenna, a predetermined distance must be secured between each radiating element and the circuit board, and the antenna is mounted in the housing. There is a problem that a large area is required and miniaturization is difficult.
JP 2004-254098 A JP 2004-56426 A

  As described above, there is a need for an antenna device that satisfies both the requirements for securing antenna gain according to the usage mode of the portable wireless device and the requirements for miniaturization and thickness reduction.

  Accordingly, an object of the present invention is to solve the above problems, to provide an antenna device and a wireless device that can secure appropriate antenna characteristics according to the usage pattern of the wireless device and can be reduced in size and thickness. To do.

  The present invention makes it possible to switch between feeding to two radiating elements, ground a radiating element that is not fed, and use the grounded radiating element as a ground conductor of the fed radiating element. It is possible to switch between the two radiating elements without increasing the distance between them, thereby reducing the area where the radiating elements of the antenna are mounted, and enabling a reduction in size and thickness.

  In addition, by switching the two radiating elements according to the form of use of the wireless device, it is possible to ensure appropriate antenna characteristics according to the use form of the wireless device.

  The antenna device of the present invention is an antenna device having two plate-like or line-like radiating elements installed in a direction parallel to the circuit board and facing each other. The grounding radiating element is used as the ground conductor of the radiating element that is fed. Thus, power is supplied to one radiating element, and the other radiating element is grounded and operates as a ground together with the circuit board. When switching is performed, the radiating element grounded last time is fed, and the radiating element previously fed is grounded and operates as a ground together with the circuit board.

  Therefore, each of the two radiating elements is operated as a ground together with the radiating element, thereby enabling a reduction in size and thickness.

  Switching between the two radiating elements is performed by a changeover switch. The changeover switch has one end as a ground terminal and the other end as a selection terminal for both radiating elements. With this changeover switch, power feeding and grounding are performed exclusively, and either one is surely performed.

  The ground terminal of the changeover switch and the circuit board are connected by an impedance element having an arbitrary value or a matching element of a reactance element. With this matching element, impedance matching between the grounded radiating element and the ground can be performed. The changeover switch can perform changeover control based on an external signal.

  One radiating element or both radiating elements may be constituted by an antenna element mounted on a circuit board in addition to a strip line formed on the circuit board. In addition, the radiating element may have a rectangular shape, and the feeding points on both radiating elements may be positioned on opposite sides of opposite sides of the rectangular shape, or on opposite sides on a diagonal line. By disposing the feeding points of the two radiating elements away from each other, the influence of the electric field formed in the vicinity of each feeding point can be reduced.

  The two plate antenna elements can be plate inverted F antennas. The short-circuit portion provided in the radiating element of the plate-like inverted F antenna may be connected to the circuit board side via a matching element when grounded.

  The two radiating elements may be short-circuited with a conductor. According to this configuration, the antenna device can be configured by forming a pair of two radiating elements and a conductor connecting them, and bending the two radiating elements to face each other with the conductor interposed therebetween. The score can be reduced. Moreover, it can connect with a circuit board at one place, and can reduce the number of connection locations.

  The present invention also includes a wireless device including the antenna device having each configuration described above.

  In the antenna device included in the wireless device of the present invention, the changeover switch can switch the radiating element that has received the external signal. The external signal includes information related to the usage pattern of the wireless device, for example, a holding state detection signal for detecting a holding state by a user of the wireless device, a communication mode state signal for identifying a communication mode executed by the wireless device, and a wireless device. The form state detection signal for detecting the form state of the casing member to be configured can be used.

  As the holding state detection signal, a detection signal of a light intensity sensor, a thermal sensor, an infrared sensor, or a contact sensor provided on the housing surface of the wireless device can be used, and each sensor detects a holding position where the user holds the wireless device. For example, when a user holds a wireless device, a sensor is disposed at a position where the hand normally contacts, and the sensor detects the holding position where the user holds the wireless device, such as the position of the hand. be able to.

  At this time, the changeover switch selects the radiation element on the opposite side to the position where the user holds the wireless device depending on the presence or absence of the detection signal of the sensor. By this selection, it is possible to avoid a radiating element that has a greater influence on the antenna characteristics by the user's hand and use a radiating element that has a smaller influence.

  The communication mode state signal is an identification signal for identifying a call mode for transmitting / receiving voice or an image mode for transmitting / receiving an image. This call mode state signal can be generated based on the selection signal even when a call or e-mail, web or the like is selected on a menu screen for selecting each function of the wireless device, for example, when a call is selected. Includes identification information representing a call mode, and identification information representing an image mode for transmitting and receiving image information including characters when an e-mail or a web is selected.

  The change-over switch selects the radiating element on the side opposite to the side where the microphone is installed in the call mode, and selects the radiating element on the side where the operation button is installed in the image mode. This selection makes it possible to avoid radiation elements that have a greater effect on the antenna characteristics depending on the user's human head during a call, and to use radiation elements that have a smaller effect. Thus, a radiating element having a smaller influence can be used while avoiding a radiating element having a larger influence on.

  The form state detection signal is a detection signal of a sensor that detects an open / closed state between casing members constituting the wireless device. The casing member that constitutes the wireless device is configured to be foldable to be opened and closed, configured to be opened and closed while the display surface is faced up, and rotated and opened in two axes while the display surface is faced up. There are a configuration for opening and closing, a configuration in which one side is slid on the other side with the display surface faced up, and the like can be freely opened and closed, and the sensor detects this open / closed state.

  The change-over switch performs selection based on the communication mode state signal when the sensor detection signal is in the open state, and selects the radiating element based on the holding state detection signal when the sensor detection signal is in the closed state. In addition, a preset radiation element is selected. As a result, the radiating element can be selected according to the usage state of the wireless device such as the open / closed state, the communication mode state, and the holding state.

  According to the antenna device of the present invention, it is possible to select a radiating element according to the usage pattern of the wireless device, and thereby to obtain an appropriate antenna characteristic according to the usage state.

  In addition, according to the antenna device of the present invention, two radiating elements can be provided without increasing the distance between the circuit board and the radiating element by grounding the radiating element that is not fed between the two radiating elements. It can be set as the provided structure, and size reduction and thickness reduction are attained.

  According to the radio apparatus of the present invention, it is possible to reduce the size and thickness by using the antenna apparatus of the present invention, and it is possible to select a radiating element that can obtain a good antenna gain according to the usage pattern of the radio apparatus. Therefore, the transmission / reception characteristics can be improved.

  In addition, the usage form includes a plurality of states such as a holding state in which the user holds the wireless device, a communication mode state in which the user uses the wireless device, and an open / closed state of a casing member constituting the wireless device. It can correspond to the form.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The antenna device of the present invention can use a linear radiating element in addition to the plate-shaped radiating element. In the following description, the plate-shaped radiating element will be described. Further, the plate-shaped radiating element is not limited to the plate-shaped inverted F-type antenna, but can be applied to various plate-shaped antennas, and is also applied to an antenna configuration in which a loop antenna is formed in a planar shape. However, the following description will be made mainly using a plate-like inverted F-type antenna.

  FIG. 1 is a diagram for explaining the outline of an antenna device of the present invention. This is a diagram for mainly explaining the configuration of the radiating element, and other configurations are omitted. 1A and 1B, the antenna device 1 includes two antenna elements 4 and 5 at one end of a circuit board 2. Each antenna element 4, 5 includes plate-like radiation elements 4 a, 5 a and short-circuit portions (stubs) 4 b, 5 b that short-circuit the radiation elements 4 a, 5 a with the circuit board 2. The short-circuit portions (stubs) 4b and 5b are provided in the vicinity of the feeding points 6 and 7 in the plate-like inverted F-type antenna for impedance matching. Each of the radiating elements 4 a and 5 a is fed from feeding points 6 and 7 of an RF circuit (high frequency circuit) 3 on the circuit board 2. In the figure, the feeding points on the radiating elements 4a and 5a are indicated by black circles.

  The radiating elements 4a and 5a included in the antenna device of the present invention are arranged to face each other with a predetermined distance H, and the connection with the feeding points 6 and 7 can be switched, and one radiating element is connected to the feeding point. In this case, the other radiating element is grounded to the ground, and conversely, when the other radiating element is connected to the feeding point, one radiating element is grounded to the ground. This switching between power feeding and grounding is performed by a switch not shown. Since the plate-like inverted F-type antenna is grounded when operating as an antenna by the short-circuit portions (stubs) 4b and 5b, the radiating elements 4a and 5a are always grounded even when power feeding is switched. It has become.

  In the grounding between the radiating element and the ground at the time of switching, a configuration in which a matching element such as an impedance element or a reactance element can be connected between the ground, and in the configuration in which the matching element is connected, Select and connect matching elements. By adopting a configuration in which matching elements such as impedance elements and reactance elements are connected, it becomes possible to change the terminal impedance of the non-feeding side radiating element as seen from the feeding side radiating element, and the degree of freedom in designing the antenna is increased. Can be improved. The matching element to be connected may be terminated using a different impedance element or reactance element for each radiating element, in addition to being common to the two radiating elements.

  FIG. 1C shows a state in which the feeding point 6 and the radiating element 4a are connected to feed power to the radiating element 4a, and the radiating element 5a is grounded to the circuit board 2. In this case, the radiating element 4a operates as an antenna with the circuit board 2 and the radiating element 5a as the ground.

  On the other hand, FIG. 1 (d) shows a state where the feeding point 7 and the radiating element 5 a are connected to feed power to the radiating element 5 a, and the radiating element 4 a is grounded to the circuit board 2. In this case, the radiating element 5a operates as an antenna with the circuit board 2 and the radiating element 4a as the ground.

  FIG. 2 is a diagram for explaining a configuration example of the changeover switch. 2A and 2B show configuration examples for switching between feeding and grounding, and FIGS. 2C and 2D show configuration examples of a changeover switch in the case of a plate-like inverted F-type antenna. .

  FIG. 2A shows a state in which the radiating element 4a is connected to the RF circuit (high frequency circuit) 3 by the changeover switch 8, and the radiating element 5a is grounded via the matching element 9 such as an impedance element or a reactance element. Yes. By this switching, the radiating element 4a is supplied with power and operates as an antenna together with the grounded radiating element 5a.

  On the other hand, FIG. 2B shows a state in which the radiating element 5a is connected to the RF circuit (high frequency circuit) 3 by the changeover switch 8 and the radiating element 4a is grounded via the matching element 9 such as an impedance element or a reactance element. Show. By this switching, the radiating element 5a is supplied with power and operates as an antenna together with the grounded radiating element 4a.

  In the case of a plate-like inverted F-type antenna, FIG. 2 (c) shows that the changeover switch 8 connects the power supply terminal of the radiating element 4a to the RF circuit (high frequency circuit) 3 and grounds the short-circuit terminal. The state where the feeding terminal of the radiating element 5a is disconnected and the short-circuit terminal is grounded via the matching element 9 such as an impedance element or a reactance element is shown. By this switching, the radiating element 4a is supplied with power and operates as an antenna together with the radiating element 5a which is impedance-matched and grounded.

  On the other hand, in FIG. 2D, the changeover switch 8 connects the feeding terminal of the radiating element 5a to the RF circuit (high frequency circuit) 3 and grounds the short-circuiting terminal, while disconnecting the feeding terminal of the radiating element 4a and short-circuiting. The terminal is grounded through a matching element 9 such as an impedance element or a reactance element. By this switching, the radiating element 5a is supplied with power and operates as an antenna together with the radiating element 4a that is impedance-matched and grounded.

  Since the radiation element on the non-feed side is grounded to the ground of the circuit board, the operation is as if the circuit board had been extended, and the radiation characteristics close to the normal antenna configuration in which the radiation element facing the circuit board was placed. Can have.

  That is, by short-circuiting the non-power-feeding radiating element using the changeover switch, the same effect as the configuration in which the two radiating elements are installed across the circuit board can be obtained without increasing the distance between the radiating element and the circuit board. Obtainable.

  As a result, the configuration in which the two radiation elements are installed can be reduced in size and thickness without sacrificing the radiation characteristics of the antenna.

  The changeover switch 8 switches the connection state between the radiating elements 4a and 5a, the RF circuit 3, and the ground based on an external signal. This external signal includes information regarding the usage pattern of the wireless device. For example, a holding state detection signal for detecting a holding state by a user of the wireless device, a communication mode state signal for identifying a communication mode executed by the wireless device, and a form state detection for detecting a form state of a casing member constituting the wireless device It can be a signal.

  As the holding state detection signal, a detection signal of a light intensity sensor, a thermal sensor, an infrared sensor, or a contact sensor provided on the housing surface of the wireless device can be used, and each sensor detects a holding position where the user holds the wireless device. For example, when a user holds a wireless device, a sensor is disposed at a position where the hand normally contacts, and the sensor detects the holding position where the user holds the wireless device, such as the position of the hand. .

  The change-over switch 8 selects a radiation element on the side opposite to the position where the user holds the wireless device depending on the presence or absence of a detection signal from the sensor. This selection avoids a radiating element that has a greater influence on the antenna characteristics by the user's hand, and uses a radiating element that has a smaller influence.

  The communication mode state signal is an identification signal for identifying a call mode for transmitting / receiving audio or an image mode for transmitting / receiving an image. This call mode state signal can be generated based on the selection signal even when a call or e-mail, web or the like is selected on a menu screen for selecting each function of the wireless device, for example, when a call is selected. Includes identification information representing a call mode, and identification information representing an image mode for transmitting and receiving image information including characters when an e-mail or a web is selected.

  The change-over switch 8 selects the radiating element on the side opposite to the side where the microphone is installed in the call mode, and selects the radiating element on the side where the operation button is installed in the image mode. This selection makes it possible to avoid radiation elements that have a greater effect on the antenna characteristics depending on the user's human head during a call, and to use radiation elements that have a smaller effect. A radiating element having a smaller influence is used while avoiding a radiating element having a larger influence on the above.

  The form state detection signal is a detection signal of a sensor that detects an open / close state between casing members constituting the wireless device. The casing member that constitutes the wireless device is configured to be foldable to be opened and closed, configured to be opened and closed while the display surface is faced up, and rotated and opened in two axes while the display surface is faced up. There are a configuration for opening and closing, a configuration in which one side is slid on the other side with the display surface faced up, and the like can be freely opened and closed, and the sensor detects this open / closed state.

  The change-over switch 8 performs selection based on the communication mode state signal when the sensor detection signal is in the open state, and switches the radiating element based on the holding state detection signal when the sensor detection signal is in the closed state. In addition to selection, a preset radiating element is selected. Thus, the radiating element is selected according to the usage state of the wireless device such as the open / closed state, the communication mode state, and the holding state.

  FIG. 3 is a block diagram for explaining the system configuration of the radio apparatus according to the present invention, mainly showing only the part for explaining the switching function of the radiating element of the present invention, and omitting the configuration of the other radio apparatus. Yes.

  In FIG. 3, control of each unit 103 to 110 is controlled by a control unit 101 such as a CPU (Central Processing Unit) via a control and data line 102. The control unit 101 performs predetermined control according to a program recorded in the ROM 103 and a command input from the operation unit 105. The operation unit 105 is a part for inputting each operation included in the wireless device, and can be configured by a numeric key or the like. The display unit 106 is a display part included in the wireless device, and can be configured by, for example, a liquid crystal display device. A RAM 104 is provided as an element for temporarily storing data.

  Communication is performed by the antenna device via the communication unit 107. The antenna device includes a first antenna element 4 and a second antenna element 5, and is selected and switched by the switching unit 108, and one of the antenna elements is used as an antenna, and the other antenna element is used as a ground. .

  In the antenna device of the present invention, the two antenna elements 4 and 5 are switched by the switching unit 108, and transmission / reception is performed via the communication unit 107. The switching unit 108 detects a holding state detection signal for detecting a holding state by a user of the wireless device, a communication mode state signal for identifying a communication mode executed by the wireless device, and a form state of a casing member constituting the wireless device. In response to an external signal such as a form state detection signal, the radiating element 4a of the first antenna element 4 or the radiating element 5a of the second antenna element 5 is controlled to be fed or grounded.

  For these external signals, detection signals from the state detection unit 109 and the sensor 110 can be used.

  The state detection unit 109 outputs a communication mode state signal and a form state detection signal. The communication mode state signal is an identification signal for identifying a communication mode executed by the wireless device, and identifies, for example, a call mode for transmitting / receiving voice and an image mode for transmitting / receiving an image.

  This identification signal can be formed based on, for example, the menu contents selected on the operation unit 105. When a call is selected on the menu screen or operation key, the call mode is determined, and the menu screen or operation key is used. When an e-mail, web, or the like is selected, the image mode is determined.

Further, the sensor 110 can be a light intensity sensor, a thermal sensor, an infrared sensor, a contact sensor, or the like, and is provided on the housing surface of the wireless device to detect a holding position where the user holds the wireless device. When the sensor detects, the holding position where the user holds the wireless device such as the hand position is detected. The switching unit 108 selects the radiation elements 4a and 5a to be fed and grounded based on the detection signal of this sensor.

  Further, the switching unit 108 feeds and grounds the communication mode state signal and the form state detection signal from the state detection unit 109 and the holding state detection signal from the sensor 110 based on a single identification signal, respectively. In addition to selecting 5a, it can also be performed based on a logic combining these.

  In the configuration of FIG. 1 described above, the two radiating elements are configured to be electrically independent from each other, and feeding and grounding are exclusively selected by the changeover switch, but the two radiating elements are electrically connected between them. It is good also as a structure connected to. 4 and 5 are views for explaining a configuration in which two radiating elements are connected.

  FIG. 4 is a diagram for explaining another schematic configuration of the antenna device of the present invention, and FIG. 5 is a diagram for explaining the configuration of two radiating elements.

  The configuration shown in FIG. 4 is substantially the same as the configuration of the antenna shown in FIG. 1 except for the configuration of the radiating elements. Hereinafter, only parts different from the above-described configuration will be described.

  4A and 4B, the radiating elements 4a and 5a are electrically connected by a short-circuit portion 10.

  In FIG. 4C, the feeding point 6 and the radiating element 4a are connected to feed power to the radiating element 4a, and the radiating element 5a is grounded to the circuit board 2 and is in the ground state. Further, FIG. 4D shows that the feeding point 7 and the radiating element 5a are connected to supply power to the radiating element 5a. The radiating element 4a is connected to the radiating element 5a by the short-circuit portion 10 and is connected via the radiating element 5a. The circuit board 2 is grounded to be in a ground state.

  According to this configuration, since the radiating element 4a and the radiating element 5a are electrically connected, impedance matching of both the radiating elements can be performed by short-circuiting the circuit board side in either one, A common short-circuit point can be achieved.

  Further, the two radiating elements 4 a and 5 a can be formed of a U-shaped sheet metal together with the short-circuit portion 10. FIG. 5 is a diagram for explaining the configuration of two radiating elements and a short-circuit portion. FIG. 5A shows a plan view, and FIG. 5B shows a state in which the radiating elements are bent and face each other. The U-shaped sheet metal is configured by connecting two rectangular radiation elements 4 a and 5 a with a short-circuit portion 10. The two radiating elements 4a and 5a can be formed by bending the short-circuit portion 10 and facing each other.

  According to this configuration, since the two radiating elements can be formed of a member made of one sheet metal together with the short-circuit portion, the manufacturing process can be simplified by omitting the connection process for connecting the members.

  The positions of the two radiating elements and the circuit board in the height direction (thickness direction) may be arbitrary. In FIGS. 1 and 4 described above, the upper and lower two radiating elements are arranged with the circuit board interposed therebetween, but one radiating element may be arranged at the same height level of the circuit board. FIG. 6 explains the arrangement position of the radiating elements with reference to a diagram for explaining another schematic configuration of the antenna device of the present invention.

  The configuration shown in FIG. 6 is substantially the same as the configuration of the antenna shown in FIG. 1 except for the arrangement position of the radiating elements. Hereinafter, only parts different from the above-described configuration will be described.

  In the configuration shown in FIG. 6, an example is shown in which the radiating element 5 a is spatially arranged at the same level as the circuit board 2 as shown in FIGS. 6A and 6B.

  In FIG. 6C, the radiating element 5a is disposed at the same level as the circuit board 2, the radiating element 4a is disposed at a distance H above the radiating element 5a, and the feed point 6 and the radiating element 4a Is connected to supply power to the radiating element 4a, and the radiating element 5a is grounded to the circuit board 2. According to this state, when viewed from the radiation element 4a, the radiation element 5a is equivalent to the extension of the circuit board 2. Further, in FIG. 6D, the feeding point 7 and the radiating element 5a are connected to supply power to the radiating element 5a, and the radiating element 4a is grounded to the circuit board 2 and is in the ground state.

  Further, in each radiating element, the position of the feeding point on the radiating element side connected to the feeding point on the RF circuit 3 side can be in various forms. The position of the feeding point in the two radiating elements can be arbitrary, but the position of both feeding points affects the amount of electromagnetic coupling when the other radiating element is viewed from one radiating element. Therefore, the amount of electromagnetic coupling between both radiating elements can be adjusted by adjusting the positions of both feeding points.

  7 and 8 are diagrams for explaining the position of the feeding point of the radiating element. Note that the radiating element 4a and the radiating element 5a shown in FIG. 8 are shown at the upper and lower positions in the drawing, but are arranged at opposing positions in the configuration of the antenna device.

  FIG. 7A and FIG. 8A are configuration examples in which both feeding points are arranged close to each other. The feeding point 6a on the radiating element 4a side and the feeding point 7a on the radiating element 5a side are arranged close to each other.

  FIGS. 7B and 8B are configuration examples in which both feeding points are arranged on both ends of the short side of the rectangular radiating element. The feeding point 6a on the side of the radiating element 4a and the feeding point 7a on the side of the radiating element 5a are arranged at both ends of the short sides facing each of the radiating elements.

  FIG.7 (c) and FIG.8 (c) are the structural examples which arrange | position both feeding points on the both ends of the long side of a rectangular-shaped radiation | emission element. The feeding point 6a on the side of the radiating element 4a and the feeding point 7a on the side of the radiating element 5a are arranged on both end sides of the long sides facing each radiating element.

  FIG. 7D and FIG. 8D are configuration examples in which both feeding points are arranged at the diagonal ends of a rectangular radiating element. The feeding point 6a on the side of the radiating element 4a and the feeding point 7a on the side of the radiating element 5a are arranged at each end on the diagonal line of each radiating element.

  FIG. 7 shows a configuration in which short-circuit portions (stubs) 4b and 5b are provided in the vicinity of the wiring in addition to the wiring for supplying power.

  Next, a mode of switching the radiating elements will be described with reference to FIGS. The switching mode of the radiating elements can be variously set according to the usage mode when the user uses the wireless device including the antenna device.

  User usage forms include, for example, the holding state of where the user holds the wireless device, whether the user makes a call using the wireless device, and transmission / reception of image data including characters such as e-mail and web Each mode of communication mode, such as whether or not to perform, and when the positional relationship changes between a plurality of casing members constituting the wireless device, there are various modes such as a configuration state depending on the positional relationship between the casing members . Which of the two radiating elements is to be selected can be set in consideration of the relationship with the environmental state that inhibits the radiating characteristics in each of these forms, either alone or in combination. The environment that impedes the radiation characteristics is an element that affects the electric field and degrades the radiation characteristics of the antenna, such as a user's hand, the human head, or a component of the wireless device.

  Hereinafter, with reference to FIGS. 9 to 17, the selection of the radiating element in each usage mode is set using an example of a mobile phone as a wireless device provided with an antenna device.

  In addition, as a form of the mobile phone, there is a form in which the mutual positional relationship is changed by a rotation operation or a slide operation of each of the two cases, in addition to a straight shape having a single case.

  In the form of two housings, the housing having the operation unit and the housing having the display surface are opened and closed around the opposite side (hereinafter referred to as a foldable type), the housing having the operation unit and the display surface A case in which a housing provided with a rotation around an axis perpendicular to the surface (hereinafter referred to as a rotary slide type), a case in which a case provided with an operation unit and a case provided with a display surface rotate around two axes (hereinafter referred to as 2) Known is a shaft rotation type), and a form in which a display surface is slid linearly with respect to a housing having an operation unit (hereinafter referred to as a linear slide type).

  In each of the above forms, when the positional relationship of the housing changes, the display surface in the foldable form is different from the inside to the inside, but the rotary slide type, the biaxial rotary type, In the linear slide type form, the display surface is always directed outward.

  The selection of the radiating element can be performed in consideration of the following points, for example.

  When using a mobile phone by a user, operations such as e-mail and web are often performed using the operation unit such as keys while referring mainly to the display surface. Select a radiating element that provides efficiency. In this case, since the user can generally observe the display surface and hold the casing with a hand whose operation surface is the front side, the user selects a radiation element on the side opposite to the surface held by the hand.

  Also, when making a call, the mobile phone is used close to the human head, so it is affected both by the human head and by the hand, but the side that is farther away from the human head Select a radiating element.

  The usage form of the mobile phone is based on the positional relationship of the case of the mobile phone, which part of the mobile phone case the user holds, and the user using the mobile phone in the call mode. The radiating element is selected on the basis of whether or not to use in a data mode for transmitting and receiving image data.

  First, the case where the mobile phone has a straight shape including a single casing will be described with reference to the schematic diagram of FIG. 9 and the flowcharts of FIGS.

  In FIG. 9A, the mobile phone 11 includes a display surface 15 and operation keys 20 on a housing 12. When using an e-mail or web, the user usually holds the housing 12 by hand because the operation key 20 is operated while referring to the display surface 15. At this time, the user's hand holds the surface (here, the back surface) opposite to the surface (here, the front surface) on which the display surface 15 and the operation keys 20 are provided.

  In order to obtain good radiation characteristics, it is necessary to avoid the influence of the hand, and the radiation element 4a on the surface side away from the hand is selected. In FIG. 9A, the radiation direction from the selected radiation element 4a is indicated by an arrow.

  Further, as shown in FIG. 9B, in the call state in which the user makes a call, it is necessary to avoid the influence of the human head, so the radiation element 5a on the back surface side away from the human head is selected.

  The above-described selection of the radiating element can be performed by a sensor provided in the housing, in addition to performing the function selection on the mobile phone.

  FIG. 9C shows an example of a sensor provided in the housing 12. The sensor 16 detects a relationship between the casing and the external environment. For example, the sensor 16 is held by a user's hand, the casing is close to the human head, the front surface or the back surface. Detect which is facing the outside.

  Various sensors such as a light intensity sensor, a thermal sensor, an infrared sensor, and a contact sensor can be used as the sensor.

  In the case of a photometric sensor, it is installed at the front and back surfaces of the housing, or at a position covered by a hand or human head when used by a user. The light intensity sensor has a high detection intensity when there are no obstacles outside, and has a low detection intensity when it is nearby such as being covered with an obstacle such as a hand or a human head. Therefore, it is possible to detect which side of the front or back side faces the outside direction and which side faces the hand or the human head by the detection intensity, and the radiation is determined by the installation position of the photometric sensor and the detection intensity. An element can be selected.

  In the case of a thermal sensor, like the photometric sensor, it is installed at the front and back surfaces of the housing, or at a position covered by a hand or human head when used by a user. The heat sensor detects the heat of an obstacle such as a hand or a human head. Therefore, it is possible to detect whether the front surface or the back surface is facing the hand or the human head based on the detection intensity of the thermal sensor, and it is possible to select a radiation element depending on the installation position of the thermal sensor and its detection intensity. .

  In the case of a contact sensor, like the thermal sensor, it is installed at the front and back surfaces of the housing, or at a position covered by a hand or human head when used by a user. The contact sensor detects contact of an obstacle such as a hand or a human head. Therefore, it is possible to detect whether the front surface or the back surface is in contact with the hand or the human head based on the detection intensity of the contact sensor, and the radiation element can be selected based on the installation position of the contact sensor and its detection intensity. it can.

  The flowchart of FIG. 10 shows a selection operation when a radiating element is selected according to the operation mode of the mobile phone. Here, the display surface and the surface on which the operation keys are provided are the front surface, and the opposite surface is the back surface.

  When the power of the mobile phone is on (S1), it is determined whether the mobile phone is in a call mode or a data mode (a mode for transmitting / receiving image data including characters such as e-mail and web). This mode can be determined from, for example, a menu selection result of the mobile phone (S2).

  When the call mode is selected, in order to avoid the influence of the human head, the radiating element on the back side is selected as an antenna element, and the radiating element on the front side is grounded (S3). On the other hand, when the data mode is selected, the radiating element on the front surface side is selected as an antenna element and the radiating element on the back surface side is grounded in order to avoid the influence by hand (S4). The above S2 to S4 are repeated to select a radiating element according to the change of the mode state (S5).

  The flowchart of FIG. 11 shows a selection operation in the case of selecting a radiating element based on the sensor output of the mobile phone. Here, the display surface and the surface on which the operation keys are provided are the front surface, and the opposite surface is the back surface.

  When the power of the mobile phone is on (S11), the output is detected by a sensor provided in the mobile phone and compared with a preset threshold value (S12).

  If it is determined by comparison between the sensor output and the threshold value that the user is in call mode, the radiation element on the back side is selected as the antenna element to avoid the influence of the human head, and the front side The radiation element is grounded (S13). On the other hand, if it is determined that the user is in a data mode state using e-mail, web, etc., the radiation element on the back side is selected by selecting the radiating element on the front side as an antenna element in order to avoid the influence by hand. The element is grounded (S14). The above S12 to S14 are repeated to select a radiating element according to the change of the mode state (S15).

  Next, a case where the mobile phone includes two housings, and is known as a foldable mobile phone, in which the housing provided with the operation unit and the housing provided with the display surface are opened and closed with the opposite side as an axis is shown in FIG. This will be described with reference to the schematic diagram of FIG.

  In FIG. 12A, the mobile phone 11 is configured to be openable and closable around a side on which a casing 13 having a display surface 15 and a casing 14 having operation keys 20 are arranged opposite to each other as a rotation axis. Known as a telephone.

  In this configuration, when using a telephone call, an e-mail, or a web, the casing 13 is normally rotated around the rotation axis with respect to the casing 14 and opened.

  In FIG. 12A, when using an e-mail or a web with both housings opened, the user operates the operation key 20 with reference to the display surface 15, so that the user can operate the housing 14. Hold by hand. At this time, the user's hand holds the surface (here, the back surface) opposite to the surface (here, the front surface) on which the display surface 15 and the operation keys 20 are provided.

  In order to obtain good radiation characteristics, it is necessary to avoid the influence of the hand, and the radiation element 4a on the surface side away from the hand is selected. In FIG. 12A, the radiation direction from the selected radiation element 4a is indicated by an arrow.

  Also, in the state where the case is opened, in the call state where the user makes a call as shown in FIG. 12B, it is necessary to avoid the influence by the human head, so the back side away from the human head The radiating element 5a is selected.

  The above-described selection of the radiating element can be performed by a sensor provided in the housing, in addition to performing the function selection on the mobile phone.

  FIG. 12C shows an example of a sensor provided in the housing 13 or the housing 14. The sensor 16 detects a relationship between the casing and the external environment. For example, the sensor 16 is held by a user's hand, the casing is close to the human head, the front surface or the back surface. Detect which is facing the outside. As described above, various sensors such as a light intensity sensor, a thermal sensor, an infrared sensor, and a contact sensor can be used as the sensor. Either the front surface or the back surface is covered on the hand or the human head depending on the detection intensity of the sensor. It can be detected whether it is connected or touched, and the radiating element is selected according to the installation position of the sensor and its detected intensity.

  In addition, a sensor that detects whether both housings are in an open state or a closed state is provided, and a radiation element can be selected in combination with the open / close state of the housing, the mode state, sensor output, and the like. . Note that a sensor that detects opening and closing of the housing can also be used as a sensor included in a foldable mobile phone.

  The flowchart of FIG. 13 shows an example of selecting a radiating element according to a combination of the open / close state of the housing, the mode state, and the sensor output.

  If the casing of the mobile phone is open (S21), it is determined whether the call mode is for making a call or the data mode for transmitting / receiving image data such as e-mail or web (S22). Selects the radiating element 5a on the back surface (opposite to the human head) (S24), and in the data mode, selects the radiating element 4a on the front surface (opposite side of the hand) (S25).

  If the casing of the mobile phone is closed (S21), the sensor output is compared with a preset threshold value (S23). If it is determined by comparison between the sensor output and the threshold value that the user is in a talking state, the radiation element on the back side is selected as the antenna element to avoid the influence of the human head, The radiating element is grounded (S26). On the other hand, when it is determined that the user is in a state of using e-mail, web, etc., in order to avoid the influence by hand, the radiating element on the front side is selected as an antenna element, and the radiating element on the back side is selected. The ground is used (S25).

  Next, the mobile phone is composed of two housings, and the housing having the operation unit and the housing having the display surface rotate around an axis perpendicular to the surface (rotating slide type), the housing having the operation unit And FIG. 16 to FIG. 16 are schematic views of each of a form in which a housing having a display surface rotates in two axes (two-axis rotation type) and a form in which the housings slide with each other (linear slide type), and This will be described with reference to the flowchart of FIG.

  In the linear slide type, the rotary slide type, and the two-axis rotary type, the display surface always faces outward, so the influence of the hand etc. when referring to the display surface with the housing closed Need to be considered.

  FIG. 14 shows a case of a mobile phone which is called a rotary slide type and has a rotation axis perpendicular to the operation surface and the display surface.

  In FIG. 14A, the mobile phone 11 is configured to be able to open and close by rotating a housing 13 having a display surface 15 and a housing 14 having an operation key 20 around a rotation axis perpendicular to both surfaces by a predetermined angle. It is.

  In this configuration, when using a telephone call, an e-mail, or a web, the casing 13 is normally rotated around the rotation axis with respect to the casing 14 and opened.

  In FIG. 14A, when using an e-mail or a web with both housings opened, the user operates the operation key 20 with reference to the display surface 15, so that the user can operate the housing 14. Hold by hand. At this time, the user's hand holds the surface (here, the back surface) opposite to the surface (here, the front surface) on which the display surface 15 and the operation keys 20 are provided.

  In order to obtain good radiation characteristics, it is necessary to avoid the influence of the hand, and the radiation element 4a on the surface side away from the hand is selected. In FIG. 14A, the radiation direction from the selected radiation element 4a is indicated by an arrow.

  Similarly, in a state in which the user makes a call as shown in FIG. 14B in a state where the housing is opened, it is necessary to avoid the influence by the human head, so that the back side away from the human head The radiating element 5a is selected.

  The above-described selection of the radiating element can be performed by a sensor provided in the housing, in addition to performing the function selection on the mobile phone.

  By rotating the casing 13 and the casing 14 of the mobile phone 11 around the rotation axis (FIG. 14C), the casing 13 can be put on the casing 14 (see FIG. 14). 14 (d)). In a state where the housings are overlapped, the display surface 15 provided on the housing 13 is in a state of facing outward. As a result, the e-mail or web displayed on the display surface 15 can be viewed.

  At this time, in consideration of viewing the display surface 15 while holding the casing, the radiation element 4a on the surface side away from the hand may be selected in order to reduce deterioration of radiation characteristics due to the hand. Further, when the display surface 15 is not displayed and is simply in a standby state, the radiation element 5a on the back surface side is selected in consideration of reducing the influence of the circuit member provided in the housing 13. May be.

  FIG. 15 shows a case of a mobile phone called a two-axis rotating type in which a casing having an operation surface and a casing having a display surface are rotatable about two axes.

  In FIG. 15A, the mobile phone 11 has a configuration in which a casing 13 provided with a display surface 15 and a casing 14 provided with operation keys 20 are rotated around two rotation axes orthogonal to each other so as to be opened and closed. .

  In this configuration, when calling, using e-mail, or using the web, the casing 13 is rotated with respect to the normal casing 14 by rotating it around the two rotation axes, and the operation of the operation keys 20 and the display surface 15 are performed. A state is set in which observation can be performed simultaneously.

  In FIG. 15A, when using an e-mail or a web with both housings opened, the user operates the operation key 20 with reference to the display surface 15, so that the user can operate the housing 14. Hold by hand. At this time, the user's hand holds the surface (here, the back surface) opposite to the surface (here, the front surface) on which the display surface 15 and the operation keys 20 are provided.

  In order to obtain good radiation characteristics, it is necessary to avoid the influence of the hand, and the radiation element 4a on the surface side away from the hand is selected. In FIG. 15A, the radiation direction from the selected radiation element 4a is indicated by an arrow.

  Also, in the state where the case is opened, in the call state where the user makes a call as shown in FIG. 15B, it is necessary to avoid the influence by the human head, so the back side away from the human head The radiating element 5a is selected.

  The above-described selection of the radiating element can be performed by a sensor provided in the housing, in addition to performing the function selection on the mobile phone.

  The casing 13 and the casing 14 of the mobile phone 11 are rotated around two rotation axes (FIGS. 15C and 15D), so that the casing 13 is superposed on the casing 14. (FIG. 15D). In a state where the housings are overlapped, the display surface 15 provided on the housing 13 is in a state of facing outward. As a result, the e-mail or web displayed on the display surface 15 can be viewed.

  At this time, in consideration of viewing the display surface 15 while holding the casing, the radiation element 4a on the surface side away from the hand may be selected in order to reduce deterioration of radiation characteristics due to the hand. Further, when the display surface 15 is not displayed and is simply in a standby state, the radiation element 5a on the back surface side is selected in consideration of reducing the influence of the circuit member provided in the housing 13. May be.

  FIG. 16 shows a case of a mobile phone called a linear slide type, in which a housing having an operation surface and a housing having a display surface are slidable with respect to each other.

  In FIG. 16A, the mobile phone 11 is configured to be freely opened and closed by sliding the housing 13 having the display surface 15 and the housing 14 having the operation keys 20 linearly.

  In this configuration, when using a call, e-mail, or web, the casing 13 is slid linearly with respect to the normal casing 14 to open, and the operation of the operation key 20 and the observation of the display surface 15 are simultaneously performed. It is in a state where it can be performed.

  In FIG. 16A, when using an e-mail or web with both housings open, the user usually operates the operation key 20 with reference to the display surface 15, so that the user operates the housing 14. Hold by hand. At this time, the user's hand holds the surface (here, the back surface) opposite to the surface (here, the front surface) on which the display surface 15 and the operation keys 20 are provided.

  In order to obtain good radiation characteristics, it is necessary to avoid the influence of the hand, and the radiation element 4a on the surface side away from the hand is selected. In FIG. 16A, the radiation direction from the selected radiation element 4a is indicated by an arrow.

  Also, in the state where the case is opened, in the call state where the user makes a call as shown in FIG. 16B, it is necessary to avoid the influence by the human head, so the back side away from the human head The radiating element 5a is selected.

  The above-described selection of the radiating element can be performed by a sensor provided in the housing, in addition to performing the function selection on the mobile phone.

  By sliding the casing 13 and the casing 14 of the mobile phone 11 (FIGS. 16C and 16D), the casing 13 can be placed on the casing 14 (FIG. 16). 16 (d)). In a state where the housings are overlapped, the display surface 15 provided on the housing 13 is in a state of facing outward. As a result, the e-mail or web displayed on the display surface 15 can be viewed.

  At this time, in consideration of viewing the display surface 15 while holding the casing, the radiation element 4a on the surface side away from the hand may be selected in order to reduce deterioration of radiation characteristics due to the hand. Further, when the display surface 15 is not displayed and is simply in a standby state, the radiation element 5a on the back surface side is selected in consideration of reducing the influence of the circuit member provided in the housing 13. May be.

  The flowchart of FIG. 17 shows an example of selecting a radiation element in the above-described linear slide type, rotary slide type, and biaxial rotary type.

  If the casing of the mobile phone is open (S31), it is determined whether the call mode is for making a call or the data mode for transmitting / receiving image data such as e-mail or web (S32). Selects the radiating element 5a on the back surface (opposite to the human head) (S33), and in the data mode, selects the radiating element 4a on the front surface (opposite side of the hand) (S34).

  Further, when the casing of the mobile phone is closed (S31), for example, in order to avoid the influence by hand, the radiating element on the front side is selected as an antenna element, and the radiating element on the back side is set as the ground. . The selection when the housing is closed is not limited to this, and the radiating element on the front surface side may be selected, and whether the display on the display surface is observed or the reception standby state is selected. You may make it select according to (S34).

The antenna device of the present invention can be applied not only to a mobile phone but also to a portable wireless device.

It is a figure for demonstrating the outline of the antenna apparatus of this invention. It is a figure for demonstrating the example of 1 structure of a changeover switch. It is a block diagram for demonstrating the system configuration | structure of the radio | wireless apparatus of this invention. It is a figure for demonstrating another schematic structure of the antenna apparatus of this invention. It is a figure for demonstrating the structure of the two radiation elements of this invention. It is a figure for demonstrating another schematic structure of the antenna apparatus of this invention. It is a figure for demonstrating the position of the feed point of the radiation element of this invention. It is a figure for demonstrating the position of the feed point of the radiation element of this invention. It is the schematic in the case of the straight shape which the radio | wireless apparatus of this invention consists of one housing | casing. It is a flowchart of radiation | emission element selection in case the radio | wireless apparatus of this invention is the straight shape which consists of one housing | casing. It is a flowchart which selects the radiation | emission element in case the radio | wireless apparatus of this invention is the straight shape which consists of one housing | casing. It is the schematic when the radio | wireless apparatus of this invention is a foldable type. It is a flowchart which selects the radiation | emission element in case the radio | wireless apparatus of this invention is a folding type. It is the schematic when the radio | wireless apparatus of this invention is a rotation slide type | mold. It is the schematic when the radio | wireless apparatus of this invention is a biaxial rotation type. It is the schematic when the radio | wireless apparatus of this invention is a linear slide type | mold. It is a flowchart which selects a radiation | emission element in the radio | wireless apparatus of this invention in the form of a linear slide type, a rotary slide type, and a biaxial rotation type. It is a figure for demonstrating the outline of the conventional antenna device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Antenna device, 2 ... Circuit board, 3 ... RF (high frequency) circuit, 4 ... 1st antenna element, 4a ... Radiation element, 4b ... Short circuit part, 5 ... 2nd antenna element, 5a ... Radiation element, 5b ... Short circuit , 6, 7... Power feeding unit, 8, changeover switch, 9, matching element, 10, short circuit unit, 111, wireless device, 12 to 14, housing, 15, display surface, 16, sensor Rotating axis, 20 Operation key, 101 Control unit, 102 Line, 103 ROM, 104 RAM, 105 Operation unit, 106 Display unit, 107 Communication unit, 108 Switching unit, 109 State detection Part, 110... Sensor.

Claims (20)

In an antenna device having two plate-like or linear radiating elements installed in a direction parallel to the circuit board and facing each other,
An antenna device characterized in that feeding and grounding of both radiating elements are exclusively selectable, and the grounded radiating element is a ground conductor of the fed radiating element.   The antenna device according to claim 1, further comprising a changeover switch having one end as a ground terminal and the other end as a selection terminal of the two radiating elements.   The antenna device according to claim 2, wherein the grounding terminal of the changeover switch and the circuit board are connected by an impedance element having an arbitrary value or a matching element of a reactance element.   The antenna device according to claim 2, wherein the changeover switch performs changeover control based on an external signal.   The antenna device according to claim 2, wherein at least one of the radiating elements is a strip line formed on a circuit board or an antenna element mounted on the circuit board.   The radiating element has a rectangular shape, and feeding points of both the radiating elements are at positions opposite to each other on opposite sides of the rectangular shape or at positions opposite to each other on a diagonal line. The antenna device described.   The antenna device according to claim 1, wherein the two radiating elements constitute a plate-like inverted F antenna.   The antenna device according to claim 1, wherein the two radiating elements are short-circuited by a conductor. In a wireless device including an antenna device having two plate-like or linear radiating elements installed in a direction parallel to a circuit board and facing each other,
The antenna device includes an antenna device in which feeding and grounding of both radiation elements are exclusively selectable, and the grounded radiation element is used as a ground conductor of the fed radiation element.   The wireless device according to claim 9, wherein the antenna device includes a changeover switch having one end as a ground terminal and the other end as a selection terminal of the two radiating elements.   The radio apparatus according to claim 10, wherein an impedance element or a reactance element having an arbitrary value is connected between the ground terminal of the changeover switch and the circuit board.   The wireless device according to claim 10 or 11, wherein the changeover switch performs changeover control based on an external signal.   The external signal detects a holding state detection signal for detecting a holding state by a user of the wireless device, a communication mode state signal for identifying a communication mode executed by the wireless device, and a form state of a casing member constituting the wireless device. The radio apparatus according to claim 12, wherein the radio apparatus is at least one of form state detection signals. The holding state detection signal is at least one of detection signals of a light intensity sensor, a thermal sensor, an infrared sensor, and a contact sensor provided on a housing surface of the wireless device,
The wireless device according to claim 13, wherein the changeover switch selects a radiating element according to the presence or absence of a detection signal of the sensor. The communication mode state signal is an identification signal for identifying a call mode for transmitting / receiving voice or an image mode for transmitting / receiving an image,
The selector switch selects a radiating element on the side opposite to the side where the microphone is installed in the call mode, and selects a radiating element on the side where the operation button is installed in the image mode. Item 14. The wireless device according to Item 13. The form state detection signal is a detection signal of a sensor that detects an open / close state between housing members constituting the wireless device,
The changeover switch performs selection based on the communication mode state signal when the detection signal of the sensor is in an open state, and selection based on the holding state detection signal when the detection signal of the sensor is in a closed state. The wireless device according to claim 13, wherein the selected selection is performed.   The wireless device according to any one of claims 9 to 16, wherein at least one of the radiating elements is a strip line formed on a circuit board included in a wireless device or an antenna element mounted on the circuit board. apparatus.   The radiating element has a rectangular shape, and feeding points of both radiating elements are positions opposite to each other on opposite sides of the rectangular shape or positions opposite to each other on a diagonal line. The wireless device described.   The radio apparatus according to claim 9, wherein the two radiating elements constitute a plate-like inverted F antenna.   The radio apparatus according to claim 9, wherein the two radiating elements are short-circuited by a conductor.

Images