JP4189433B1 - Portable radio - Google Patents

Abstract

Provided is a portable wireless device that does not depend on an opening angle without changing the characteristics of a capacitively coupled and feeding type housing dipole antenna even if the opening angle changes.
In a foldable portable wireless device 100, a cross section of a coupling sheet metal 112 of an upper casing 101 that is capacitively coupled to a power feeding sheet metal 113 of a lower casing 102 is configured by a substantially U-shaped plate element. The outer dimensions of the coupling sheet metal 112 are equal in length and width, and are substantially the same as the length of the power feeding sheet metal 113 of the lower housing 102 facing each other. The area of the coupling sheet metal 112 facing the power supply sheet metal 113 when the upper casing 101 is opened by 180 degrees and the area of the coupling sheet metal 112 facing the power feeding sheet metal 113 when the upper casing 101 is opened by 90 degrees. Is substantially the same, and the capacitance value is also constant. As a result, even if the opening angle of the upper casing 101 changes, the capacitively coupled and feeding type casing dipole antenna characteristics (impedance, gain) do not change and do not depend on the opening angle.
[Selection] Figure 3

Description

  The present invention relates to a portable wireless device such as a mobile phone, and more particularly to a foldable portable wireless device having a structure in which a housing in which two housings are connected in an openable / closable manner can be folded.

  In recent years, portable wireless devices, which are a type of mobile phone, have a structure that can be opened and closed by connecting an upper housing and a lower housing with a hinge portion, and are open during communication and data communication and closed during standby A foldable portable wireless device that can take two states is widely used. Since the folding portable wireless device has a structure that can change its form depending on the use state, it is important to secure the antenna performance in each state. In addition, miniaturization and multi-functionalization are also advancing in this foldable portable wireless device. As one of the multi-functionalizations in recent years, antennas are being built in to improve design.

  Patent Document 1 discloses a foldable portable wireless device including a built-in antenna configured to use a conductor constituting a part of an upper housing of a portable wireless device as an antenna element and to feed power from a lower housing using a feeder. Is described. The folding portable wireless device described in Patent Document 1 applies the principle of using the conductor in the upper casing as a radiating element when opened, so that it is directly excited when the conductor in the upper casing is opened as an antenna configuration without protrusions. And used as a radiating element. In this method, there is no restriction on the height of the housing to be radiated, and the effective area of the antenna can be widened. Therefore, wideband and high gain antenna performance can be obtained.

  In Patent Document 2, an antenna element provided in a first housing, a hinge portion that rotatably connects the first housing and the second housing, and an inside of the second housing are provided. A portable wireless device comprising a circuit board having a ground pattern and a power feeding part connected to a radio circuit on the circuit board, wherein the antenna element and the hinge part, and the ground pattern on the circuit board operate as a dipole antenna is described. Has been.

  In the folding portable wireless device, in addition to the direct feeding type that feeds power directly to the hinge part or the upper casing metal, the capacitive coupling type that feeds power through the opposing coupling metal plates installed in the upper casing and the lower casing. There is.

  FIG. 9 is a diagram schematically showing a configuration of a foldable portable radio device having a conventional capacitively coupled antenna device. FIG. 9A shows a state in which the foldable portable radio device is opened about 180 degrees. FIG. 9B shows a state in which the folding portable wireless device is opened about 90 degrees.

  In FIG. 9, the foldable portable wireless device 10 includes an upper housing (first housing) 11, an antenna element 21 and a coupling metal plate 22 provided in the upper housing 11, and a lower housing (second housing). Body) 12, and a power supply sheet metal 23, a power supply terminal 24, and a circuit board 25 provided in the lower housing 12. The upper housing 11 and the lower housing 12 are rotatably connected by a hinge portion (not shown).

  The upper casing 11 and the lower casing 12 are made of a molded resin product that is an insulator, for example, a non-conductive ABS resin. The upper housing 11 is provided with an LCD display unit, a receiver, and the like (not shown). The lower housing 12 is provided with an operation unit having operation key buttons, a microphone, and the like (not shown), and includes a wireless circuit, a control circuit, an information processing circuit, and the like.

  The antenna element 21 is made of a metal frame, and the feeding point is connected to the coupling sheet metal 22. The metal frame constituting the antenna element 21 is made of a metal having high conductivity, light weight and high strength, such as a magnesium alloy.

  The coupling sheet metal 22 is a conductive plate-like element and is capacitively coupled with the power feeding sheet metal 23 to spatially separate the antenna element 21 of the upper casing 11 and the power feeding terminal 24 and the circuit board 25 of the lower casing 12. Are electrically connected.

  The power supply sheet metal 23 is a conductive plate-like element and is capacitively coupled to the coupling sheet metal 22 of the upper housing 11. The capacitance value constituted by the coupling sheet metal 22 and the power supply sheet metal 23 depends on the area where the sheet metals are opposed to each other. The capacitance value is 1 when the sheet metal is opened about 180 degrees in FIG. 9A, and about 90 in FIG. 9B. In the opened state, the capacitance value is 2 (capacitance value 1> capacitance value 2).

  The power supply terminal 24 is made of a conductive metal, and electrically connects the power supply sheet metal 23 and the ground pattern of the circuit board 25.

  The circuit board 25 is a printed circuit board on which circuit components that realize various functions of the foldable portable radio device 10 are mounted, and a ground pattern serving as a circuit ground potential is formed on almost the entire surface of the circuit board 25.

In the above configuration, the antenna element 21 operates as an upper antenna element, and the ground pattern of the circuit board 25 operates as a lower antenna element. That is, at the time of feeding, the antenna element 21, the feeding terminal 24, and the ground pattern on the circuit board 25 operate as a dipole antenna.
JP 2002-335180 A JP 2005-6096 A

  However, in the folding portable wireless device having such a conventional capacitively coupled antenna device, the capacitive coupling value on the power feeding side and the power feeding side varies depending on the opening angle of the upper and lower housings. Therefore, there is a problem that the characteristics (impedance and gain) of the capacitively coupled and feeding type housing dipole antenna deteriorate depending on the opening angle. Hereinafter, degradation of the dipole antenna characteristics due to the opening angle will be described.

  For example, as shown in FIG. 9A, when the upper casing 11 of the foldable portable wireless device 10 is opened approximately 180 degrees, the coupling sheet metal 22 of the upper casing 11 and the power supply sheet metal 23 of the lower casing 12. And opposite each other. The capacity value constituted by the coupling sheet metal 22 and the power feeding sheet metal 23 is the capacity value 1 of the maximum capacity. However, as shown in FIG. 9B, when the upper housing 11 of the foldable portable wireless device 10 is opened by about 90 degrees, the side surface of the coupling metal plate 22 of the upper housing 11 is not attached to the lower housing 12. Since it is only opposed to the power supply sheet metal 23, the capacitance value constituted by the coupling sheet metal 22 and the power supply sheet metal 23 is a capacitance value 2 that is considerably smaller than the capacitance value 1 (capacity value 1> capacity value 2). As described above, the capacitance value constituted by the coupling sheet metal 22 and the power feeding sheet metal 23 varies depending on the area where the sheet metals oppose each other. Therefore, the capacitance value differs and the dipole antenna characteristics (impedance, gain) vary.

  FIGS. 10 to 14 are diagrams for explaining characteristic changes depending on the opening angle of the upper housing 11 of the foldable portable wireless device 10. In FIG. 10, the upper housing 11 and the lower housing 12 of the foldable portable wireless device 10 are rotatably connected by a hinge portion 13.

  FIG. 11 is a characteristic diagram showing changes in the frequency and gain G [dB] depending on the opening angle θ of the upper casing 11 of the foldable portable wireless device 10, and the opening angles θ are 180 degrees, 135 degrees, and 90 degrees. Take the case as an example. As shown in FIG. 11, when the opening angle is 90 degrees, the gain G decreases at each frequency as compared with the opening angles of 180 degrees and 135 degrees. In the case of the change in the opening angle in FIG. 10, the deterioration is about 1.5 dB as shown by the average arrow in FIG.

  12 to 14 are diagrams illustrating antenna characteristics depending on the opening angle θ of the upper housing 11 of the foldable portable wireless device 10. FIGS. 12A, 13A and 14A are Smith charts showing the impedance characteristics of the dipole antenna when the opening angle θ is 180 degrees, 135 degrees and 90 degrees. The impedance characteristics of the dipole antenna are contained in a unit circle centered on the origin, the horizontal axis is the resistance component of the transmission line, the upper part of the unit circle is a positive reactance component, and the lower part of the unit circle is a negative reactance component. FIGS. 12B, 13B, and 14B are characteristic diagrams showing changes in antenna performance when the opening angle θ is 180 degrees, 135 degrees, and 90 degrees. The frequency used is the DTV band, the horizontal axis is frequency [MHz], and the vertical axis is VSWR (Voltage Standing Wave Ratio). As shown in FIGS. 12B, 13B, and 14B, when the opening angle θ changes, the capacitance value formed by the coupling sheet metal 22 and the power feeding sheet metal 23 changes, and the impedance of the DTV band is changed. Changes. Looking at the width of the frequency band that satisfies VSWR <3 (the reflected wave voltage is 50% or less), which is one of the requirements for obtaining good antenna characteristics, the opening angle θ shown in FIG. In the case of 90 degrees, only a part of the frequency band of VSWR <3 exists, and the antenna performance is greatly degraded.

  The present invention has been made in view of such a point, and provides a portable wireless device that does not depend on the opening angle without changing the characteristics of the capacitively coupled power supply type housing dipole antenna even if the opening angle changes. Objective.

The portable wireless device of the present invention includes a first casing, a second casing that is rotatably connected to the first casing, an antenna element provided in the first casing, A first conductive element electrically connected to the antenna element; a circuit board provided in the second casing; and the first conductive element provided in the second casing; A second conductive element disposed at an opposing position and capacitively coupled to the first conductive element; and a power supply unit for supplying power from the circuit board to the second conductive element . The first conductive element and the second conductive element are plate-shaped elements, and the capacitive coupling is substantially constant when the first casing and the second casing are rotated. .

  According to the present invention, when the first casing and the second casing are rotated, the capacitive coupling between the first conductive element and the second conductive element is substantially constant. Even if the angle changes, a portable wireless device that does not depend on the opening angle can be realized without changing the characteristics of the capacitively coupled and feeding case dipole antenna.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view showing a schematic configuration of a folding portable wireless device according to Embodiment 1 of the present invention.

  In FIG. 1, a folding portable radio device 100 according to the first embodiment includes an upper housing (first housing) 101 and a lower housing (second housing) 102 that rotate biaxially. The hinge portion 103 has a structure and is pivotally connected. By rotating around the hinge portion 103, the hinge portion 103 can take two states, an open state and a closed state.

  The upper housing 101 and the lower housing 102 are formed of a resin molded product that is an insulator, for example, a non-conductive ABS resin. The upper housing 101 is provided with an LCD display unit, a receiver, and the like (not shown). The lower housing 102 is provided with an operation unit having operation key buttons, a microphone, and the like (not shown), and includes a wireless circuit, a control circuit, an information processing circuit, and the like. Reference numeral 102a schematically indicates that the ground pattern of these circuit boards operates as a dipole antenna. Although not shown, the upper housing 101 and the lower housing 102 are provided with a sub screen display unit, a speaker that outputs a ringtone, a camera unit that captures an image, a connector unit that is connected to an external device, and the like. It is done.

  The hinge portion 103 is installed at a first hinge portion 103a that connects the upper housing 101 and the lower housing 102 so as to be rotatable about a first axis, and a right end portion of the first hinge portion 103a. And a second hinge portion 103b that is pivotally connected around a second axis in a direction perpendicular to the axis. The first hinge portion 103a connects the upper housing 101 so as to be openable and closable around a first axis installed at the upper end of the lower housing 102. The second hinge portion 103b connects the upper housing 101 so as to be pivotable by laterally opening in the right direction around a second axis installed at the right end of the first hinge portion 103a. In FIG. 1, the first hinge portion 103a is in a state in which the upper housing 101 and the lower housing 102 are closed, and the second hinge portion 103b is in a state in which the upper housing 101 is opened to the right by about 135 degrees. It is rotating to.

  2 is a cross-sectional view showing a cross-sectional shape of the foldable portable wireless device 100 of FIG. 1 as viewed from the direction of the arrow. FIG. 2A is a state in which the upper housing 101 is opened rightward at an opening angle of 180 degrees. 2 (b) shows a state in which the upper housing 101 is opened rightward at an angle of 135 degrees, and FIG. 2 (c) shows a state in which the upper housing 101 is opened rightward at an angle of 90 degrees. .

  FIG. 3 is a diagram schematically illustrating the configuration of the foldable portable radio device 100 according to the first embodiment. FIG. 3A illustrates the upper casing 101 of the foldable portable radio device 100 in the right direction. FIG. 3B shows a state opened at an opening angle of 180 degrees, and FIG. 3B shows a state opened at an opening angle of 90 degrees.

  In FIG. 3, the foldable portable wireless device 100 includes an upper casing 101, an antenna element 111 and a coupling metal plate 112 (first conductive element) provided in the upper casing 101, a lower casing 102, A power supply sheet metal 113 (second conductive element), a power supply unit 114, and a circuit board 115 are provided in the housing 102. The upper housing 101 and the lower housing 102 are rotatably connected by a hinge portion 103 shown in FIG.

  The antenna element 111 is made of a metal frame, and the feeding point is connected to the coupling sheet metal 112. For the metal frame constituting the antenna element 111, a metal having high conductivity, light weight and high strength, for example, a magnesium alloy is used. The antenna element 111 can be replaced with a conductive member such as a metal existing in the upper casing 101 in addition to a member dedicated to the antenna element. For example, there is a circuit board as an antenna element member that can be substituted. The circuit board includes an LCD circuit board or a protection member thereof.

  The coupling sheet metal 112 is a plate-like element that is conductive and has a substantially U-shaped cross section when viewed from the bottom surface of the upper housing 101. The outer dimensions of the coupling sheet metal 112 are substantially the same as the length of the power supply sheet metal 113 of the lower housing 102 facing each other, and the lengths of the substantially U-shapes are equal. The coupling sheet metal 112 is capacitively coupled to the power feeding sheet metal 113 of the lower casing 102 to electrically connect the antenna element 111 of the upper casing 101, the power feeding section 114 and the circuit board 115 of the lower casing 102 which are spatially separated. Connecting.

  The power supply sheet metal 113 is a conductive plate-like element and is capacitively coupled to the coupling sheet metal 112 of the upper housing 101. The capacitance value constituted by the coupling metal plate 112 and the power supply metal plate 113 is the capacitance value 1 when the opening angle is 180 degrees in FIG. 3A and the capacitance value 2 when the opening angle is 90 degrees as shown in FIG. The capacitance value 1 and the capacitance value 2 are substantially the same.

  The power feeding unit 114 is made of a conductive metal, electrically connects the power feeding sheet metal 113 and the ground pattern of the circuit board 115, and feeds power from the circuit board 115 to the power feeding sheet metal 113.

  The circuit board 115 is a printed circuit board on which circuit components that realize various functions of the foldable portable wireless device 100 are mounted, and a ground pattern serving as a circuit ground potential is formed on almost the entire surface of the circuit board 115.

  Here, the antenna element 111 operates as an upper antenna element, and the ground pattern of the circuit board 115 operates as a lower antenna element. That is, at the time of feeding, the antenna element 111, the feeding unit 114, and the ground pattern on the circuit board 115 operate as a dipole antenna. As a result, a high antenna gain can be obtained with the upper housing 101 opened.

  A case dipole antenna capacity feeding operation that does not depend on the opening angle of the folding portable wireless device 100 configured as described above will be described below.

  In the conventional foldable portable radio device 10 shown in FIG. 9A, the capacitance value constituted by the coupling sheet metal 22 and the power supply sheet metal 23 changes depending on the opening angle of the casing. As shown in FIG. 14, the antenna characteristics (impedance, gain) were deteriorated.

  On the other hand, in the folding portable wireless device 100 of the present embodiment, the cross section of the coupling sheet metal 112 of the upper casing 101 that is capacitively coupled to the power feeding sheet metal 113 of the lower casing 102 is a substantially U-shaped plate. It comprised by the shape element. The outer dimensions of the coupling sheet metal 112 are equal in length and width, and are substantially the same as the length of the power feeding sheet metal 113 of the lower housing 102 facing each other. Further, as shown by the arrows in FIGS. 3 (a) and 3 (b), the interval between the substantially U-shaped coupling sheet metal 112 and the power supply sheet metal 113 is an opened state of 180 degrees and an opened angle of 90 degrees. It is installed to be the same. In addition, it is desirable in terms of antenna performance that the distance between the coupling sheet metal 112 and the power feeding sheet metal 113 is as close as possible in order to make the capacitance value of capacitive coupling as large as possible.

  With this configuration, the capacitance value constituted by the substantially U-shaped coupling sheet metal 112 and the power supply sheet metal 113 is the capacitance value 1 in the state where the opening angle is 180 degrees in FIG. 3A and the opening in FIG. Although the capacitance value is 2 when the angle is 90 degrees, the capacitance value 1 and the capacitance value 2 are substantially the same (capacity value 1≈capacity value 2). That is, by using the coupling sheet metal 112 having a substantially U-shaped cross section, the area of the coupling sheet metal 112 facing the power feeding sheet metal 113 when the upper casing 101 is opened at an opening angle of 180 degrees, and the upper casing 101 is opened. The area of the coupling sheet metal 112 facing the power feeding sheet metal 113 when the angle is 90 degrees is substantially the same, and the spatial distance between the feeding sheet metal 113 and the coupling sheet metal 112 facing the sheet metal 113 is also substantially the same. Therefore, since the areas where the sheet metals are opposed are the same regardless of whether the upper casing 101 is opened or closed, the capacitance value is also constant. As a result, even if the opening angle of the upper housing 101 changes, the folding-type portable radio device 100 that does not depend on the opening angle is realized without changing the capacitively-coupled feeding type housing dipole antenna characteristics (impedance, gain). can do.

(Embodiment 2)
FIG. 4 is a diagram schematically showing the configuration of the folding portable radio device 200 according to Embodiment 2 of the present invention. The same components as those in FIG. 3 are denoted by the same reference numerals, and description of overlapping portions is omitted.

  4A shows a state where the upper casing 201 of the foldable portable wireless device 200 is opened rightward and opened at an angle of 180 degrees, and FIG. 4B shows a state opened at an opening angle of 90 degrees.

  In FIG. 4, a foldable portable radio device 200 includes an upper casing 201, an antenna element 111 and a coupling metal plate 212 (first conductive element) provided in the upper casing 201, a lower casing 102, The power supply sheet metal 113, the power supply unit 114, and the circuit board 115 provided in the housing 102 are provided. The upper housing 201 and the lower housing 102 are rotatably connected by a hinge portion (not shown).

  The coupling sheet metal 212 is a plate-like element that is conductive and has a substantially L-shaped cross section when viewed from the bottom surface of the upper housing 201. The outer dimension of the coupling sheet metal 212 is substantially the same as the length of the power supply sheet metal 113 of the lower housing 102 opposed to each other, with the substantially L-shaped vertical and horizontal lengths being equal. The coupling sheet metal 212 is capacitively coupled with the power feeding sheet metal 113 of the lower casing 102 to electrically connect the antenna element 111 of the upper casing 201 and the power feeding section 114 and the circuit board 115 of the lower casing 102 which are spatially separated. Connecting.

  The power feeding metal plate 113 is a conductive plate-like element and is capacitively coupled to the coupling metal plate 212 of the upper housing 201. The capacitance value constituted by the coupling metal plate 212 and the power supply metal plate 113 is a capacitance value 1 when the opening angle is 180 degrees in FIG. 4A and a capacitance value 2 when the opening angle is 90 degrees as shown in FIG. The capacitance value 1 and the capacitance value 2 are substantially the same.

  During power feeding, the antenna element 111, the power feeding unit 114, and the ground pattern on the circuit board 115 operate as a dipole antenna. Accordingly, a high antenna gain can be obtained in a state where the upper housing 201 is opened.

  In the folding portable wireless device 200 of the present embodiment, the cross section of the coupling sheet metal 212 of the upper casing 201 that is capacitively coupled to the power feeding sheet metal 113 of the lower casing 102 is configured by a substantially L-shaped plate element. It is characterized by. The outer dimensions of the coupling sheet metal 112 are equal in length and width, and are substantially the same as the length of the power feeding sheet metal 113 of the lower housing 102 facing each other. Furthermore, as shown in FIGS. 4 (a) and 4 (b), the interval between the substantially L-shaped coupling sheet metal 212 and the power supply sheet metal 113 is the same in the state where the opening angle is 180 degrees and in the state where the opening angle is 90 degrees. It is installed to become.

  With this configuration, the capacitance value constituted by the substantially L-shaped coupling metal plate 212 and the power supply metal plate 113 is the capacitance value 1 when the opening angle is 180 degrees in FIG. 4A and the opening angle in FIG. Although the capacitance value is 2 in the opened state of 90 degrees, the capacitance value 1 and the capacitance value 2 are substantially the same (capacity value 1≈capacity value 2). That is, by using the coupling sheet metal 212 having a substantially L-shaped cross section, the area of the coupling sheet metal 212 facing the power feeding sheet metal 113 when the upper casing 201 is opened at an opening angle of 180 degrees, and the opening angle of the upper casing 201 are The area of the coupling sheet metal 212 facing the power feeding sheet metal 113 when opened 90 degrees is substantially the same, and the spatial distance between the coupling sheet metal 212 facing the power feeding sheet metal 113 is also substantially the same. Accordingly, the area where the sheet metal faces each other is the same regardless of whether the upper housing 201 is opened or closed, so that the capacitance value is also constant. Thereby, even if the opening angle of the upper housing 201 is changed, the folding portable wireless device 200 that does not depend on the opening angle is realized without changing the capacitively-coupled feeding type housing dipole antenna characteristics (impedance, gain). can do.

  Since the folding portable wireless device 200 of the present embodiment is configured using the substantially L-shaped coupling sheet metal 212, the upper casing 201 is compared with the substantially U-shaped coupling sheet metal 112 of the first embodiment. There is an effect that the assembly at the time of assembling the coupling sheet metal 212 is easy. In general, an L-shaped member requires less time for insertion and mounting than a U-shaped member. The effect of reducing the manufacturing cost can be expected.

  Here, since the present embodiment uses a substantially L-shaped coupling sheet metal 212, when the upper casing 201 is closed, the substantially L-shaped coupling sheet metal 212 supplies power to the lower casing 102. It is not capacitively coupled to the sheet metal 113 and therefore does not operate as a dipole antenna. When the upper casing 201 is used in a closed state or in a closing direction, it is preferable to install the substantially U-shaped coupling sheet metal 112 of the first embodiment.

(Embodiment 3)
FIG. 5 is a diagram schematically showing the configuration of a folding portable wireless device 300 according to Embodiment 3 of the present invention. The same components as those in FIG. 3 are denoted by the same reference numerals, and description of overlapping portions is omitted.

  FIG. 5A shows a state in which the upper housing 301 of the foldable portable wireless device 300 is opened in the right direction at an opening angle of 180 degrees, and FIG. 5B shows a state in which it is opened at an opening angle of 90 degrees.

  In FIG. 5, the foldable portable wireless device 300 includes an upper casing 301, an antenna element 111 and a coupling sheet metal 312 (first conductive element) provided in the upper casing 301, a lower casing 102, The power supply sheet metal 113, the power supply unit 114, and the circuit board 115 provided in the housing 102 are provided. The upper housing 301 and the lower housing 102 are rotatably connected by a hinge portion (not shown).

  The coupling sheet metal 312 is a plate-like element that is conductive and has a semicircular cross section when viewed from the bottom surface of the upper housing 301. The outer dimension of the coupling sheet metal 312 is preferably a size that is substantially the same as the length of the power feeding sheet metal 113 of the opposed lower casing 102 regardless of whether the upper casing 301 is opened or closed. Here, the coupling sheet metal 312 has a horseshoe shape. The coupling sheet metal 212 is capacitively coupled with the power feeding sheet metal 113 of the lower casing 102 to electrically connect the antenna element 111 of the upper casing 301 and the power feeding section 114 and the circuit board 115 of the lower casing 102 which are spatially separated. Connecting.

  The power supply sheet metal 113 is a conductive plate-like element and is capacitively coupled to the coupling sheet metal 312 of the upper housing 301. The capacitance value constituted by the coupling metal plate 312 and the power supply metal plate 113 is a capacitance value 1 when the opening angle is 180 degrees in FIG. 5A and a capacitance value 2 when the opening angle is 90 degrees in FIG. The capacitance value 1 and the capacitance value 2 are substantially the same. In addition, the capacitance value is substantially the same for a capacitance value in an arbitrary opening angle (not shown), for example, an opening angle of 135 degrees, an opening angle of 45 degrees, or an opening angle of 0 degrees.

  During power feeding, the antenna element 111, the power feeding unit 114, and the ground pattern on the circuit board 115 operate as a dipole antenna. As a result, a high antenna gain can be obtained with the upper housing 301 opened.

  In the folding portable wireless device 300 of the present embodiment, the cross section of the coupling sheet metal 312 of the upper casing 301 that is capacitively coupled to the power feeding sheet metal 113 of the lower casing 102 is formed by a semicircular plate-like element including a horseshoe shape. It is characterized by comprising. The outer dimension of the coupling metal plate 312 is configured to be substantially the same as the length of the power supply metal plate 113 of the lower housing 102 opposed to each other regardless of the open / closed state of the upper housing 301. Further, as shown in FIGS. 5 (a) and 5 (b), the interval between the semicircular coupling sheet metal 312 and the power supply sheet metal 113 is as follows: the opening angle is 180 degrees, the opening angle is 90 degrees, and the other It is installed to be the same at any opening angle.

  With this configuration, the area where the sheet metal faces each other is the same regardless of whether the upper housing 301 is opened or closed. Therefore, the capacitance value formed by the semicircular coupling sheet metal 312 and the power feeding sheet metal 113 is at any opening angle. In this case, the distance is constant, and the spatial distance between the feeding sheet metal 113 and the coupling sheet metal 312 facing the feeding sheet metal 113 is substantially the same. Thereby, even if the opening angle of the upper housing 301 is changed, the folding-type portable wireless device 300 that does not depend on the opening angle is realized without changing the capacitively-coupled feeding type housing dipole antenna characteristics (impedance, gain). can do.

  Since the folding portable wireless device 300 according to the present embodiment is configured using the semicircular coupling sheet metal 312, the substantially U-shaped coupling sheet metal 112 of the first embodiment or the substantially L shape of the second embodiment. Compared to the joint sheet metal 212 having a shape, there is an effect that even if the opening angle is other than the opening angle 180 degrees and the opening angle 90 degrees (for example, the opening angle 135 degrees), it does not depend on the opening angle. In other words, by using the semicircular coupling sheet metal 312, there is a specific effect that the capacitance value is constant regardless of the opening angle, and the dipole antenna characteristics (impedance, gain) do not change. However, when it is assumed that the opening angle is limited to a specific opening angle, for example, when the opening angle is only 180 degrees or the opening angle is 90 degrees, the substantially U-shaped coupling sheet metal 112 according to the first embodiment is used. In addition, it is considered that the use of the substantially L-shaped coupling sheet metal 212 of the second embodiment is advantageous in terms of antenna characteristics because the coupling capacitance value can be increased.

(Embodiment 4)
Embodiments 4 to 6 are examples in which the folding portable wireless device according to Embodiments 1 to 3 is provided with an adjustment unit that adjusts the amount of capacitive coupling to optimize antenna characteristics. .

  FIG. 6 is a diagram schematically showing a configuration of a folding portable wireless device 400 according to Embodiment 4 of the present invention. The same components as those in FIG. 3 are denoted by the same reference numerals, and description of overlapping portions is omitted.

  6A shows a state in which the upper housing 401 of the foldable portable wireless device 400 is opened in the right direction at an opening angle of 180 degrees, and FIG. 6B shows a state in which it is opened at an opening angle of 90 degrees.

  6, the foldable portable wireless device 400 includes an upper casing 401, an antenna element 111 provided in the upper casing 401, an adjustment unit 410, a substantially U-shaped coupling sheet metal 112, a lower casing 102, The power supply sheet metal 113, the power supply unit 114, and the circuit board 115 are provided in the lower housing 102. The upper housing 401 and the lower housing 102 are rotatably connected by a hinge portion (not shown).

  The adjustment unit 410 adjusts the amount of capacitive coupling between the antenna element 111 and the substantially U-shaped coupling sheet metal 112. Specifically, the adjustment unit 410 includes a capacitor and a coil that adjust an antenna concentration constant generated when the antenna element 111 and the coupling metal plate 112 are connected.

  As described above, the folding portable wireless device 400 is configured to install the adjustment unit 410 between the antenna element 111 and the substantially U-shaped coupling sheet metal 112. In addition to the effects of the first embodiment, The amount of capacitive coupling between the antenna element 111 and the coupling sheet metal 112 can be adjusted, and the antenna characteristics can be optimized.

(Embodiment 5)
FIG. 7 is a diagram schematically showing a configuration of a folding portable wireless device 500 according to Embodiment 5 of the present invention. The same components as those in FIG. 4 are denoted by the same reference numerals, and description of overlapping portions is omitted.

  FIG. 7A shows a state in which the upper casing 501 of the foldable portable wireless device 500 is opened in the right direction at an opening angle of 180 degrees, and FIG. 7B shows a state in which it is opened at an opening angle of 90 degrees.

  In FIG. 7, the foldable portable wireless device 500 includes an upper housing 501, an antenna element 111 provided in the upper housing 501, an adjustment unit 510 and a substantially L-shaped coupling metal plate 212, a lower housing 102, A power supply sheet metal 113, a power supply unit 114, and a circuit board 115 provided in the lower housing 102 are provided. The upper housing 501 and the lower housing 102 are rotatably connected by a hinge portion (not shown).

  The adjustment unit 510 includes a capacitor and a coil for adjusting the lumped constant of the antenna, and adjusts the amount of capacitive coupling between the antenna element 111 and the substantially L-shaped coupling sheet metal 212.

  As described above, since the folding portable radio device 500 is configured to install the adjustment unit 510 between the antenna element 111 and the substantially L-shaped coupling sheet metal 212, in addition to the effects of the second embodiment, the antenna The amount of capacitive coupling between the element 111 and the coupling sheet metal 212 can be adjusted, and the antenna characteristics can be optimized.

(Embodiment 6)
FIG. 8 is a diagram schematically showing a configuration of a folding portable wireless device 600 according to the sixth embodiment of the present invention. The same components as those in FIG. 5 are denoted by the same reference numerals, and description of overlapping portions is omitted.

  FIG. 8A shows a state in which the upper housing 601 of the foldable portable wireless device 600 is opened rightward at an opening angle of 180 degrees, and FIG. 8B shows a state opened at an opening angle of 90 degrees.

  In FIG. 8, the foldable portable radio device 600 includes an upper housing 601, an antenna element 111 provided in the upper housing 601, an adjustment unit 610 and a semicircular coupling sheet metal 312, a lower housing 102, and a lower housing 102. The power supply sheet metal 113, the power supply unit 114, and the circuit board 115 provided in the housing 102 are provided. The upper housing 601 and the lower housing 102 are rotatably connected by a hinge portion (not shown).

  The adjustment unit 610 includes a capacitor and a coil that adjust the lumped constant of the antenna, and adjusts the amount of capacitive coupling between the antenna element 111 and the semicircular coupling sheet metal 312.

  As described above, since the folding portable radio device 600 is configured to install the adjusting unit 610 between the antenna element 111 and the semicircular coupling sheet metal 312, in addition to the effects of the third embodiment, the antenna element The amount of capacitive coupling between 111 and the coupling sheet metal 312 can be adjusted, and the antenna characteristics can be optimized.

  The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this.

  The present invention can be applied to any device as long as the portable wireless device has a structure in which two cases can be opened and closed and can be folded. For example, the present invention can be applied not only to mobile phones / PHS (Personal Handy-Phone System) but also to portable information terminals such as PDA (Personal Digital Assistants) and information processing devices such as notebook computers.

  In addition, as in the above embodiments, in the case of a resin molded product in which the frame and the hinge portion of the upper casing are insulators, a feeder line is used for the conductor plate existing inside or on the exterior surface of the upper casing. You may make it function as an antenna element.

  That is, in general, a conductor plate is used for a circuit board wiring pattern in the upper and lower casings, a conductive frame that holds the shield case and the main display, and a plate-like metal attached to the upper casing. It has been. The antenna element 111 and / or the circuit board 115 can be replaced by the above-described various conductive members in addition to the members dedicated to the antenna element. In addition, a conductor plate is used for the plate-like metal attached to the upper casing existing on the exterior surfaces of the upper casing and the lower casing. And since it can supply with the electric power feeding line comprised by the flexible printed circuit board etc. which were provided in the hinge part in them, what is necessary is just to utilize this structure.

  In each of the above embodiments, the used frequency band is not limited to the DTV band, and may be any band. In Japan, portable radios that can use both PDC (Personal Digital Cellular) using the 900 MHz band and Code Division Multiple Access (CDMA) using the 2 GHz band have been commercialized as portable radios that support multiple frequency bands. ing. Overseas, GSM (Global System for Mobile Communications) using 900 MHz band, DCS (Digital Communication System) using 1.8 GHz band, PCS (Personal Communication Services) using 1.9 GHz band, and 2 GHz band are used. Mobile radios that can be used in combination with UMTS (Universal Mobile Telecommunications System) have been commercialized. For example, the first frequency band may be a single band of 2 GHz, and the second frequency band may be three bands of 900 MHz band, 1.8 GHz band, and 1.9 GHz band.

  In each of the above embodiments, the name of the folding portable wireless device is used. However, this is for convenience of explanation, and of course, a portable wireless device, a case dipole capacity feeding method, or the like may be used.

  Further, the type, number, connection method, and the like of each circuit unit constituting the portable wireless device are not limited to the above-described embodiments.

  The portable wireless device according to the present invention can provide a folding portable wireless device that can obtain high antenna performance without projecting the antenna, regardless of whether the antenna is opened or closed, and is suitable for downsizing. . In addition, the housing can be reduced in size and the manufacturing cost can be reduced with a simple circuit configuration without requiring a plurality of antennas. Furthermore, since there is no projection of the antenna when the housing is closed, the design can be improved, which is useful for improving the wireless communication performance of the folding portable wireless device. INDUSTRIAL APPLICABILITY The present invention is useful for a mobile phone that can fold a casing, a foldable portable wireless device such as a PHS, and the like.

The perspective view which shows schematic structure of the foldable portable radio | wireless machine which concerns on Embodiment 1 of this invention. Sectional drawing which shows the cross-sectional shape of the foldable portable radio | wireless apparatus which concerns on this Embodiment 1. The figure which shows the structure of the foldable portable radio | wireless machine which concerns on this Embodiment 1 typically. The figure which shows typically the structure of the foldable portable radio | wireless apparatus which concerns on Embodiment 2 of this invention. The figure which shows typically the structure of the foldable portable radio | wireless apparatus which concerns on Embodiment 3 of this invention. The figure which shows typically the structure of the foldable portable radio | wireless machine which concerns on Embodiment 4 of this invention. The figure which shows typically the structure of the foldable portable radio | wireless machine which concerns on Embodiment 5 of this invention. The figure which shows typically the structure of the foldable portable radio | wireless machine which concerns on Embodiment 6 of this invention. The figure which shows typically the structure of the folding portable radio | wireless machine which has the conventional capacitive coupling type antenna apparatus. The figure explaining the characteristic change by the opening angle of the upper case of the conventional foldable portable radio A characteristic diagram showing changes in frequency and gain G depending on the opening angle θ of the upper case of the conventional folding portable wireless device The figure which shows the antenna characteristic by opening angle theta of the upper case of the former folding portable radio equipment The figure which shows the antenna characteristic by opening angle theta of the upper case of the former folding portable radio equipment The figure which shows the antenna characteristic by opening angle theta of the upper case of the former folding portable radio equipment

Explanation of symbols

100, 200, 300, 400, 500, 600 Foldable portable wireless devices 101, 201, 301, 401, 501, 601 Upper housing (first housing)
102 Lower housing (second housing)
DESCRIPTION OF SYMBOLS 103 Hinge part 103a 1st hinge part 103b 2nd hinge part 111 Antenna element 112,212,312 Connection sheet metal (1st electroconductive element)
113 Power feeding sheet metal (second conductive element)
114 Power supply unit 115 Circuit board 410, 510, 610 Adjustment unit

Claims (6)

A first housing;
A second housing rotatably connected to the first housing;
An antenna element provided in the first housing;
A first conductive element electrically connected to the antenna element;
A circuit board provided in the second housing;
A second conductive element provided in the second casing and disposed at a position facing the first conductive element and capacitively coupled to the first conductive element;
A power feeding unit for feeding power from the circuit board to the second conductive element,
The first conductive element and the second conductive element are plate-shaped elements,
A portable wireless device in which the capacitive coupling is substantially constant when the first casing and the second casing are rotated. The portable wireless device according to claim 1, wherein the first conductive element has a substantially U-shaped cross section. The portable wireless device according to claim 1, wherein the first conductive element has a substantially L-shaped cross section. The portable wireless device according to claim 1, wherein the first conductive element has a substantially semicircular cross section including a horseshoe shape.   The portable wireless device according to claim 1, further comprising adjusting means for adjusting a capacitive coupling amount between the antenna element and the first conductive element.   The portable wireless device according to claim 1, wherein the antenna element, the power feeding unit, and a ground pattern of the circuit board operate as a dipole antenna.

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