JP2004056426A - Portable radio device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin folding cellular telephone provided with a built-in antenna having high gain in various usage states. <P>SOLUTION: An upper case 1 and a lower case 2 are rotatably connected together at a hinge 3. A plate conductors 4 and 5 are provided along the case surface within the upper case 1. A ground plate 6 is constituted by a ground pattern of a circuit board provided within the lower case 2. The plate conductors 4 and 5 are selected by a high frequency switch 14 to be connected to one end of a power supply 15. The other end of the power supply 15 is connected to the ground plate 6 to constitute a dipole antenna. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a portable wireless device such as a foldable portable telephone.
[0002]
[Prior art]
2. Description of the Related Art A folding type mobile phone has a structure in which an upper housing and a lower housing are rotatably connected to each other by a hinge portion, and has a mechanism that can be opened and closed. This foldable mobile phone can be provided with a large display screen in the upper housing, and has the advantages of convenience when opened and used and a compact shape when closed.
[0003]
In a conventional foldable mobile phone, as an antenna, for example, a projection-type antenna disposed in a lower housing as disclosed in Japanese Patent Application Laid-Open No. 2002-27066, or disclosed in Japanese Patent Application Laid-Open No. 2001-45123. A protruding antenna disposed in an upper housing as described above is used. These protruding antennas generally use a helical antenna or a telescopic monopole antenna, and since the antenna section protrudes from the housing, the antenna gain can be increased when the mobile phone is used by hand. Has advantages.
[0004]
On the other hand, as an antenna built in the housing of the foldable mobile phone, a strip line antenna as disclosed in Japanese Patent Application Laid-Open No. 10-308618 and a Japanese Patent Application Laid-Open No. 2001-284934 are disclosed. An antenna with a built-in hinge portion having such a structure is known.
[0005]
Also, a so-called flip-type built-in type antenna such as a coil antenna disclosed in JP-A-9-64778 or a microstrip line antenna disclosed in JP-A-10-190330. Is also known.
Also, a multi-element built-in antenna combining a dipole antenna which is a radiating element built in an upper housing and a parasitic element built in a lower housing as disclosed in Japanese Patent Application Laid-Open No. 10-84406 is also known. ing.
[0006]
[Problems to be solved by the invention]
However, the above-mentioned conventional projection type antenna has a problem that the projection structure of the antenna unit is obstructed during use, for example, when the mobile phone inserted in the pocket is taken out, the projected antenna unit is caught.
[0007]
On the other hand, according to the conventional built-in antenna described above, since there is no portion protruding from the housing, such a problem does not occur. However, in the above-described conventional antenna with a built-in hinge, a relatively high antenna gain is obtained when the mobile phone is brought close to the ear and the mouth and a call is made (hereinafter referred to as a call state) when only the lower housing is held by hand. However, when the hinge is held by hand, the antenna gain is deteriorated because the antenna is covered with the hand.
[0008]
In addition, the above-mentioned conventional flip unit built-in type antenna has an advantage that the antenna unit is not covered with a hand in a call state, but the antenna gain is increased due to the proximity of the mobile phone body and the antenna unit in a state where the flip unit is closed. There was a problem of deterioration.
[0009]
In addition, the above-described conventional multi-element built-in antenna has an advantage that a high antenna gain can be secured when the upper and lower casings are closed, but the vicinity of the radiating element is covered by hand in a call state with the upper and lower casings opened. In such a case, there is a problem that the antenna gain is deteriorated.
[0010]
As described above, the built-in antenna has a problem that the gain in a specific use state is lower than that of the protrusion type antenna, and it is difficult to avoid this problem with a single built-in antenna. However, for example, by arranging a plurality of built-in antennas at a plurality of locations on the upper and lower housings and switching between them, if any one built-in antenna has a sufficient gain, a high antenna gain is obtained. Is obtained.
[0011]
However, arranging a plurality of the above-described conventional built-in antennas requires a large space for housing the plurality of antennas inside the upper and lower housings. Will be hindered.
[0012]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a foldable mobile phone including a built-in antenna having a high gain even in various use states and capable of being thinned. Is to do.
[0013]
[Means for Solving the Problems]
A portable wireless device according to the present invention includes an upper housing foldable around a hinge portion, a lower housing, an upper housing, an upper antenna element respectively incorporated in the lower housing, a lower antenna element, and one end connected to the upper antenna. A feeder electrically connected to the element and having the other end electrically connected to the lower antenna element, wherein the upper antenna element and the lower antenna element operate as a dipole antenna.
[0014]
With this configuration, the respective antenna elements housed in the first and second housings integrally operate as a dipole antenna, and have a high antenna gain in a use state in which the portable wireless device is held by hand. Is obtained.
[0015]
Further, the portable wireless device of the present invention is configured such that the upper antenna element is constituted by a plurality of upper antenna elements, and selectively connected to one end of the feeder by a plurality of upper antenna element switching means.
[0016]
With this configuration, a directional diversity effect can be obtained, and a high antenna gain can be obtained even when the mobile phone is held by either the left hand or the right hand in a call state.
[0017]
Further, the portable wireless device of the present invention is configured to include a switching unit for electrically connecting the plurality of upper antenna elements to the feeding unit or electrically connecting to the lower antenna element, respectively. did.
[0018]
This configuration has an effect that a higher directivity diversity effect can be obtained.
[0019]
Further, the portable wireless device of the present invention includes a first and second upper antenna element, a half-wave element electrically connected to the second upper antenna element, and a first upper antenna element or a half-wave element. A configuration is provided in which switching means is provided for selectively switching any one of the power supply units to be electrically connected.
[0020]
With this configuration, high antenna performance can be obtained even when the portable wireless device is closed.
[0021]
In addition, a portable wireless device according to the present invention includes first and second upper antenna elements, and first and second half-wave elements electrically connected to the first and second upper antenna elements, respectively. , The first and second upper antenna elements, and the first and second half-wavelength elements are selectively switched to the power supply unit.
[0022]
With this configuration, high antenna performance can be obtained even when the portable wireless device is closed, and a directional diversity effect can also be obtained.
[0023]
In addition, the portable wireless device of the present invention has a configuration in which each impedance matching unit individually corresponds to each of the plurality of upper antenna elements.
[0024]
With this configuration, high antenna performance can be obtained even when the portable wireless device is closed.
[0025]
Also, the portable wireless device of the present invention controls the housing opening / closing state detecting means for detecting whether the upper housing and the lower housing are opened from each other and the switching means according to the detection result of the housing opening / closing state detecting means. And a control means for performing the control.
[0026]
With this configuration, it is possible to obtain high antenna performance according to the open / closed state of the portable wireless device.
[0027]
Further, the portable wireless device of the present invention is configured to include a control unit that determines the reception level of the wireless circuit unit and controls the switching unit so as to increase the reception level.
[0028]
With this configuration, it is possible to always ensure high antenna performance in various use states of the portable wireless device.
[0029]
Further, the portable wireless device of the present invention has a configuration in which the upper antenna element and the lower antenna element are formed in a plate shape along the housing surfaces of the upper housing and the lower housing, respectively.
[0030]
With this configuration, the upper housing and the lower housing can be formed to be thin, respectively, even though the upper antenna element and the lower antenna element are built in the upper housing and the lower housing, respectively. It has the effect of being able to sufficiently cope with the light weight and thinness of this.
[0031]
In addition, the portable wireless device of the present invention is configured such that the lower antenna element is configured by a ground pattern on a printed circuit board disposed inside the lower housing, the wireless circuit section is provided on the circuit board, and the ground of the wireless circuit section is provided. Are electrically connected to a ground pattern, and the feeding section of the wireless circuit section is electrically connected to the upper antenna element or the switching means.
[0032]
With this configuration, high antenna performance is ensured, and the thickness of the portable wireless device can be reduced more easily.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First Embodiment)
FIG. 1 is a schematic configuration diagram of a portable wireless device according to the first embodiment of the present invention. The portable wireless device according to the present embodiment is a portable wireless device having a folding structure, and is shown in an open state (hereinafter, open state) in FIG. The portable wireless device includes an upper case 1, a lower case 2, a hinge part 3, a plate conductor 4, a plate conductor 5, a ground plate 6, a speaker 7, an operation key 8, and a microphone 9.
[0034]
The upper case 1 and the lower case 2 corresponding to the upper case and the lower case, respectively, are made of an insulating resin, and generally have a length of about 100 mm and a width of about 50 mm. The upper case 1 and the lower case 2 are rotatably connected to each other at a hinge portion 3, thereby forming a foldable structure.
[0035]
A speaker 7 is provided at an upper end of the upper case 1 and a microphone 9 is provided at a lower end of the lower case 2, respectively. The microphone 7 is placed near the ear and the microphone 9 is placed near the mouth.
[0036]
The plate-like conductors 4 and 5 corresponding to the upper antenna element are made of, for example, a copper plate having a length of about 90 mm and a width of about 15 mm, and are arranged inside the upper case 1 along the surface of the upper case 1. Further, the plate-shaped conductors 4 and 5 have a thickness of, for example, about 0.1 mm, and other components such as a speaker 7 and a display element inside the upper case 1 having a thin thickness of, for example, about 6 mm. It is arranged so that it may not interfere structurally.
[0037]
The ground plate 6 corresponding to the lower antenna element is, for example, a conductor plate having a length of about 90 mm and a width of about 45 mm, and a ground pattern of a circuit board disposed inside the lower case 2 may be used. The ground plate 6 has a thickness set to about 1 mm or less, and is arranged so as not to structurally interfere with other components such as the operation keys 8 and the microphone 9 inside the lower case 2.
[0038]
Feed points 10 and 11 provided below the plate-shaped conductors 4 and 5 are electrically connected to a high-frequency switch 14 by feed lines 12 and 13. As the power supply line 12 and the power supply line 13, a flexible wire that can be freely bent is used, so that the upper case 1 can be rotated at the hinge portion 3.
[0039]
The high-frequency switch 14 is composed of, for example, an FET or a PIN diode, and appropriately converts the high-frequency signals of the power supply lines 12 and 13 (for example, the directions of the cases 1 and 2 and the magnitude of the high-frequency signals of the power supply lines 12 and 13). (The larger one of the high-frequency signals is appropriately selected based on the above) and transmitted to one end of the power supply unit 15. The power supply unit 15 is an antenna power supply unit of a transmission / reception circuit disposed inside the lower case 2, and the other end of the power supply unit 15 is grounded to the ground plate 6.
[0040]
The operation of the antenna in the portable wireless device configured as described above, with the radio frequency set to, for example, 900 MHz (wavelength is about 333 mm) will be described.
In the high-frequency switch 14, when the A-side terminal is selected, the plate-shaped conductor 4 is selected. In this case, the plate-shaped conductor 4 and the ground plate 6 operate as a dipole antenna having about a half wavelength. When the high-frequency switch 14 selects the B-side terminal, the plate-like conductor 5 and the ground plate 6 similarly operate as a dipole antenna having about a half wavelength. Therefore, the plate-shaped conductors 4 and 5 and the ground plate 6 operate as a built-in dipole antenna built in the upper case 1 and the lower case 2 of the portable wireless device.
[0041]
The antenna current of the built-in dipole antenna configured as described above is distributed over a wide range from the upper ends of the plate conductors 4 and 5 to the lower end of the ground plate 6. When the user holds only the lower case 2 by hand or holds only the hinge portion 3 by hand, deterioration of the antenna gain is minimized. This is because the antenna current is distributed over a wide range from the upper end of the upper case 1 to the lower end of the lower case 2, and even if the antenna current in a specific portion is affected by the hand, the effect on the operation of the entire antenna is small. It is.
[0042]
FIG. 2 is a diagram showing the directivity of the built-in dipole antenna shown in FIG. In FIG. 2, directivity 16 and directivity 17 indicate the directivity of the Eθ (vertical polarization) component on the XY plane, respectively. The directivity 18 and the directivity 19 indicate the directivity of the Eθ component on the YZ plane, respectively.
[0043]
The directivity 16 and the directivity 18 indicate the directivity when the A side of the high-frequency switch 14 in FIG. 1 is selected, that is, when the plate-shaped conductor 4 is selected. The directivity 17 and the directivity 19 indicate the directivity when the B side of the high-frequency switch 14 is selected, that is, when the plate-shaped conductor 5 is selected.
[0044]
As can be seen from FIG. 2, when the plate-shaped conductor 4 is selected, the gain in the Y direction increases, and when the plate-shaped conductor 5 is selected, the gain in the −Y direction increases. As described above, when the high-frequency switch 14 is used to automatically select the higher-gain plate-like conductor 4 or 5, the effect of directional diversity can be obtained.
[0045]
Next, the antenna gain in a call state will be described. FIG. 3 is a diagram illustrating a call state in which the user holds the portable wireless device with the left hand or the right hand and makes a call in proximity to the ear or the mouth. As shown in FIG. 3, in a call state, the portable wireless device is often held at an angle of about 60 degrees from the Z direction. Further, in many cases, it is not possible for the user to determine whether the hand holding the portable wireless device is the left hand or the right hand. Therefore, a high antenna gain is required for the portable radio antenna in both states shown in FIG.
[0046]
In the case of a land mobile communication system such as a mobile phone system, radio waves arriving at the mobile wireless device from the wireless base station are concentrated in the horizontal plane (XY plane) at an elevation angle θ of 90 degrees in the coordinate system shown in FIG. It is known to. Therefore, a high antenna gain in the horizontal direction is required for the portable radio antenna in both states shown in FIG.
[0047]
FIG. 4 shows the XZ plane directivity when the portable wireless device shown in FIG. 1 is placed at an angle of 60 degrees, that is, when the portable wireless device is placed in the talking state shown in FIG. The coordinate system in FIG. 4 corresponds to the coordinate system shown in FIG.
[0048]
In FIG. 4, directivity 20 and directivity 21 indicate the directivity of the Eθ (vertical polarization) component on the XZ plane when held by the left hand. The directivity 22 and the directivity 23 indicate the directivity of the Eθ (vertical polarization) component on the XZ plane when held by the right hand.
[0049]
The directivity 20 and the directivity 22 indicate the directivity when the A side of the high-frequency switch 14 in FIG. 1 is selected, that is, when the plate-shaped conductor 4 is selected. Further, the directivity 21 and the directivity 23 indicate the directivity when the B side of the high-frequency switch 14 is selected, that is, when the plate-shaped conductor 5 is selected.
[0050]
As can be seen from FIG. 4, when holding with the left hand, the directivity 21 with the plate-shaped conductor 5 selected has a higher gain on the XY plane. Also, when held with the right hand, it can be seen that the directivity 22 with the plate-shaped conductor 4 selected has a higher gain on the XY plane. As described above, in the present embodiment, different plate-shaped conductors 4 and 5 have higher gains when they are held with the right hand and when they are held with the left hand. For example, although not shown, a detecting means for automatically detecting the orientation of the cases 1 and 2, that is, whether the case is held by the right hand or the left hand, is provided. 2, a switching means for automatically switching the high-frequency switch 14 shown in FIG. 1 to the higher gain, or a measuring means for measuring the gain of each of the plate conductors 4, 5; A switching means for automatically switching to a higher gain based on the gain measured by the means, so that a high antenna gain can be obtained in any communication state held by the left hand or the right hand. It can be to be.
[0051]
In the present embodiment, the upper case 1 is configured to incorporate two plate-shaped conductors and switch between them, but it is also possible to provide a single plate-shaped conductor in the upper case. In this case, the effect of the directional diversity cannot be obtained, but there is an effect that the antenna gain can be increased in a call state.
[0052]
Further, the shape of the plate-like conductor built in the upper case 1 is not limited to the shape shown in the present embodiment, and the same applies to a configuration that operates as a dipole antenna of about a half wavelength together with the ground plate built in the lower case 2. Effects can be obtained.
[0053]
Further, the plate-shaped conductor built in the upper case 1 may be formed of, for example, a conductor that mechanically supports the liquid crystal display, or a conductor thin film attached to a resin surface of the upper case 1 or It may be composed of a conductive thin film embedded inside the resin.
[0054]
In addition, the plate-shaped conductor incorporated in the upper case 1 is located at a position away from the surface of the upper case 1 where the speakers 7 are arranged, in order to reduce the influence of the proximity of the user's head, especially the ears, during a call. That is, it is desirable that the speaker 7 is disposed at a position as close as possible to the surface facing the surface on which the speaker 7 is disposed.
[0055]
(Second embodiment)
FIG. 5 is a schematic configuration diagram of a portable wireless device according to the second embodiment of the present invention. The portable wireless device according to the present embodiment is also a portable wireless device having a folding structure, and FIG. 5 shows an open state (hereinafter, an open state). In FIG. 5, the components denoted by the same reference numerals as those in FIG. 1 indicate the same components as those in FIG. 1, and the detailed description thereof will be omitted.
[0056]
The portable wireless device shown in FIG. 5 is configured such that the plate conductor 4 or the plate conductor 5 in the non-selected state is grounded to the ground plate 6 in the portable wireless device shown in FIG.
In FIG. 5, power supply lines 12 and 13 are connected to high-frequency switches 24 and 25, respectively. The high frequency switch 24 performs an operation of switching between transmitting the electric signal of the power supply line 12 to the power supply unit 15 and grounding the ground plate 6. Further, the high-frequency switch 25 performs an operation of switching between transmitting the electric signal of the power supply line 13 to the power supply unit 15 and grounding the ground plate 6.
[0057]
Here, for example, when the terminal B1 side of the high-frequency switch 25 is selected and the plate-shaped conductor 5 is connected to the feeding unit 15, the high-frequency switch 24 is selected on the terminal A2 side and the plate-shaped conductor 4 is grounded to the ground plate 6. Is done. Conversely, when the terminal A1 side of the high-frequency switch 24 is selected and the plate-shaped conductor 4 is connected to the power supply unit 15, the high-frequency switch 25 is selected on the terminal B2 side and the plate-shaped conductor 5 is grounded to the ground plate 6. Works as follows.
[0058]
FIG. 6 shows the directivity in the state where the operation is performed as described above. In FIG. 6, directivity 26 and directivity 27 indicate the directivity of the Eθ (vertical polarization) component on the XY plane, respectively. The directivity 28 and the directivity 29 indicate the directivity of the Eθ component on the YZ plane, respectively.
[0059]
The directivity 26 and the directivity 28 are in a state in which the terminal A1 side of the high-frequency switch 24 and the terminal B2 side of the high-frequency switch 25 in FIG. 5 are selected, that is, the plate-like conductor 4 is supplied with power and the plate-like conductor 5 is grounded. The directivity in a state where the plate 6 is grounded is shown. The directivity 27 and the directivity 29 indicate the directivity in a state where power is supplied to the plate-shaped conductor 5 and the plate-shaped conductor 4 is grounded to the ground plate 6.
[0060]
As can be seen from FIG. 6, when the plate-shaped conductor 4 is fed, the gain in the Y direction increases, and when the plate-shaped conductor 5 is fed, the gain in the −Y direction increases. This tendency is similar to the tendency shown in FIG. 2, but it can be seen that the maximum gain change is larger in FIG. This is because grounding the plate-shaped conductor on the side to which power is not supplied to the ground plate 6 operates as a reflection element. Thus, the directional diversity effect obtained by the configuration shown in FIG. 5 is higher than that obtained by the configuration shown in FIG.
[0061]
Note that the configurations of the high-frequency switch 24 and the high-frequency switch 25 are not limited to those shown in the present embodiment, and the same effect can be obtained as long as the configuration can switch between feeding a plate-shaped conductor or grounding to a ground plate. .
[0062]
(Third embodiment)
FIG. 7 is a schematic configuration diagram of a portable wireless device according to the third embodiment of the present invention. The portable wireless device according to the present embodiment is also a portable wireless device having a folding structure, and FIG. 7 shows an open state (hereinafter, an open state). In FIG. 7, the components denoted by the same reference numerals as those in FIG. 1 indicate the same components as those in FIG. 1, and a detailed description thereof will be omitted.
[0063]
The portable wireless device shown in FIG. 7 is configured such that the helical element 30 is inserted between the plate-shaped conductor 5 and the high-frequency switch 31 in the portable wireless device shown in FIG.
In FIG. 7, the helical element 30 is formed by winding a conductive wire in a coil shape, and its electrical length is set to approximately a half wavelength at an operating frequency (for example, 900 MHz). By inserting the helical element 30 between the plate conductor 5 and the high-frequency switch 31, the phase for exciting the plate conductor 5 is inverted.
[0064]
8 and 9 show a state where the upper case 1 and the lower case 2 of the portable wireless device shown in FIG. 7 are closed (hereinafter, a closed state). 8 shows a state where the terminal A1 side of the high-frequency switch 31 shown in FIG. 7 is selected, that is, a state where the plate-shaped conductor 4 is selected, and FIG. 9 shows a state where the terminal of the high-frequency switch 31 shown in FIG. The state where the A2 side is selected, that is, the state where the plate-shaped conductor 5 is selected is shown.
[0065]
In the state shown in FIG. 8, the phases of the antenna currents distributed on the plate-shaped conductor 4 and the ground plate 6 are as shown by arrows. For this reason, the antenna currents on the plate-shaped conductor 4 and the ground plate 6 cancel each other, and the radiation resistance becomes extremely low, so that the radiation efficiency of the antenna decreases and the impedance mismatch loss increases. As a result, the antenna gain in this state is low, and the bandwidth is reduced.
[0066]
On the other hand, when the terminal A2 side of the high frequency switch 31 as shown in FIG. 9 is selected, that is, when the helical element 30 and the plate conductor 5 are selected, the high frequency switch 31 is placed on the plate conductor 5 and the ground plate 6. The phases of the distributed antenna currents match.
[0067]
FIG. 10 shows the directivity of the Eθ component on the XY plane and the XZ plane in the state shown in FIG. As can be seen from FIG. 10, it can be seen that the omnidirectional pattern is almost omnidirectional on the horizontal plane (XY plane), and that the XZ plane has directional pattern of figure eight. In this state, a high antenna gain and a wide bandwidth can be secured.
[0068]
As described above, by switching the high-frequency switch 31 to the terminal A1 in the open state and to the terminal A2 in the closed state, high antenna performance can be obtained in both states.
[0069]
The helical element 30 has the same effect as long as it has an electrical length of approximately half a wavelength. For example, a meandering pattern printed on a printed board or an insulator may be used. Further, the helical element 30 may be constituted by a meandering conductor as a part of the plate-like conductor 5.
[0070]
(Fourth embodiment)
FIG. 11 is a schematic configuration diagram of a portable wireless device according to the fourth embodiment of the present invention. The portable wireless device according to the present embodiment is also a portable wireless device having a folding structure, and FIG. 11 shows an open state (hereinafter, an open state). In FIG. 11, components denoted by the same reference numerals as those in FIG. 7 indicate the same components as those in FIG. 7, and a detailed description thereof will be omitted.
[0071]
The portable wireless device shown in FIG. 11 is different from the portable wireless device shown in FIG. 7 in that the helical element 32 is inserted between the feeding point 34 of the plate-shaped conductor 4 and the high-frequency switch 33 so that the feeding point 11 of the plate-shaped conductor 5 is The high frequency switch 33 is connected.
In FIG. 11, the helical element 32 has the same electrical characteristics as the helical element 30. The high frequency switch 31 and the high frequency switch 33 are selected by the high frequency switch 36 and supplied to the power supply unit 15.
[0072]
In the above configuration, when the terminal A1 side of the high-frequency switch 31 and the terminal B1 side of the high-frequency switch 33 are selected, the plate-shaped conductor 4 or the plate-shaped conductor 5 and the ground plate 6 similar to the configuration shown in FIG. It operates as a dipole antenna composed of It is desirable to select this state in the open state, in which case a high antenna gain is obtained. At this time, the plate conductor 4 or the plate conductor 5 is selected by the high-frequency switch 36, so that the effect of the directional diversity can be obtained.
[0073]
Next, in the closed state, it is desirable that the terminal A2 side of the high frequency switch 31 and the terminal B2 side of the high frequency switch 33 be selected. In this state, an antenna operation similar to the configuration shown in FIG. 9 is performed, and a high antenna gain is obtained in the closed state. At this time, by selecting the plate-shaped conductor 4 or the plate-shaped conductor 5 by the high-frequency switch 36, the effect of the directional diversity in the closed state can be obtained.
[0074]
(Fifth embodiment)
FIG. 12 is a schematic configuration diagram of a portable wireless device according to the fifth embodiment of the present invention. The portable wireless device according to the present embodiment is also a portable wireless device having a folding structure, and FIG. 12 shows an open state (hereinafter, an open state). In FIG. 12, components denoted by the same reference numerals as those in FIG. 7 indicate the same components as those in FIG. 7, and a detailed description thereof will be omitted.
[0075]
The portable wireless device shown in FIG. 12 is different from the portable wireless device shown in FIG. 7 in that a matching circuit 37 and a matching circuit 38 are added, and when the plate-shaped conductor 4 is selected in the open state or when the plate-shaped conductor 4 is closed. The configuration is such that appropriate impedance matching is performed for both cases where the conductor 5 is selected.
[0076]
The control unit 39, the magnet switch 40, and the permanent magnet 41 are added to detect the open or closed state of the portable wireless device, and to switch the high-frequency switch 31 accordingly.
[0077]
In FIG. 12, the matching circuits 37 and 38 are composed of lumped constant elements such as an inductance and a capacitor, for example. The matching circuit 37 operates to match the impedance of the dipole antenna composed of the plate-shaped conductor 4 and the ground plate 6 in the open state to the impedance (generally, 50Ω) of the feeding unit 15. Further, the matching circuit 38 operates so as to match the impedance of the antenna formed by the plate-shaped conductor 5, the helical element 30 and the ground plate 6 in the closed state to the impedance of the feed unit 15.
[0078]
As described above, by providing an appropriate matching circuit for each plate-shaped conductor and the open / closed state, the antenna performance in each state is further improved.
[0079]
Next, for example, in the closed state, since the magnet switch 40 and the permanent magnet 41 are close to each other, the magnet switch 40 is turned on, and the control unit 39 detects this and switches the high frequency switch 31 to the terminal B side. Operate. On the other hand, in the open state, the magnet switch 40 is turned off, and the high frequency switch 31 is switched to the terminal A side.
[0080]
As described above, by selecting an appropriate antenna state according to the result of detecting the open / closed state, a high antenna gain can be obtained in both states.
[0081]
In addition, the matching circuit is not limited to the one configured by the lumped element, and may be configured by, for example, a planar circuit provided on a printed circuit board. Further, the means for detecting the open / closed state is not limited to the magnet switch and the permanent magnet, and may be, for example, means for detecting a mechanical operation of the hinge portion, or a call mode or a standby mode of the portable wireless device. For example, means linked to the operation state may be used.
[0082]
(Sixth embodiment)
FIG. 13 is a schematic configuration diagram of a portable wireless device according to the sixth embodiment of the present invention. The portable wireless device according to the present embodiment is also a portable wireless device having a folding structure, and FIG. 13 shows an open state (hereinafter, an open state). In FIG. 13, components denoted by the same reference numerals as those in FIGS. 7 and 12 indicate the same components as those shown in FIGS. 7 and 12, and a detailed description thereof will be omitted here.
[0083]
The portable wireless device shown in FIG. 13 is the portable wireless device shown in FIG. 7 in which the ground plate 6 is constituted by the ground pattern 43 on the printed circuit board 42. The wireless circuit unit 44 mounted on the printed circuit board 42 and This is one in which a level determination unit 45 is added.
[0084]
In FIG. 13, as the printed board 42, for example, a glass epoxy board having a thickness of about 1 mm is used. The ground pattern 43 is formed of a copper foil pattern printed on the surface of the printed circuit board 42 or on an inner layer. The ground pattern 43 has the same function as that of the ground plate 6 in FIG. With this configuration, it is not necessary to provide a ground plate that operates as an antenna so as to overlap the printed circuit board 42, which is an essential component, so that the lower case 2 of the portable wireless device can be made thinner.
[0085]
The wireless circuit section 44 is composed of a transmission circuit and a reception circuit, and is covered by electromagnetic shielding means such as a shield case. The signal selected by the high-frequency switch 31 is transmitted to the wireless circuit unit 44, and the ground of the wireless circuit unit 44 is grounded to the ground pattern 43. With such a configuration, the antenna constituted by the plate-shaped conductors 4 and 5 and the ground pattern 43 is supplied with power by the wireless circuit unit 44.
[0086]
Next, the level determination section 45 has a function of determining the level of the reception level obtained in the reception circuit constituting the wireless circuit section 44 and a function of switching the high-frequency switch 31 accordingly. Specifically, the respective reception levels when the high-frequency switch 31 is switched to the terminal A side or the terminal B side are determined, and the operation is performed so as to select the higher reception level. By continuously performing a series of these operations at an appropriate timing in, for example, a time division multiple access (TDMA) system of a mobile phone system, a high antenna gain can always be ensured.
[0087]
【The invention's effect】
As described above, according to the portable wireless device of the present invention, the dipole antenna is configured by the upper antenna element provided on the upper housing and the lower antenna element provided on the lower housing. There is an advantage that a relatively high antenna gain can be obtained even when is held by hand.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a portable wireless device according to a first embodiment of the present invention.
FIG. 2 is a view showing antenna directivity of the portable wireless device.
FIG. 3 is an explanatory diagram for explaining a use state of the portable wireless device.
FIG. 4 is a diagram showing the antenna directivity of the portable wireless device in a 60-degree tilt state;
FIG. 5 is a schematic configuration diagram of a portable wireless device according to a second embodiment of the present invention.
FIG. 6 is a view showing antenna directivity of the portable wireless device.
FIG. 7 is a schematic configuration diagram of a portable wireless device according to a third embodiment of the present invention.
FIG. 8 is an explanatory diagram showing an operation of the portable wireless device in a closed state (first);
FIG. 9 is an explanatory diagram showing an operation of the portable wireless device in a closed state (second).
FIG. 10 is a diagram showing the antenna directivity of the portable wireless device.
FIG. 11 is a schematic configuration diagram of a portable wireless device according to a fourth embodiment of the present invention.
FIG. 12 is a schematic configuration diagram of a portable wireless device according to a fifth embodiment of the present invention.
FIG. 13 is a schematic configuration diagram of a portable wireless device according to a sixth embodiment of the present invention.
[Explanation of symbols]
1 Upper case (upper case)
2 Lower case (lower case)
3 hinge part
4 Plate conductor (upper antenna element)
5 Plate conductor (upper antenna element)
6 Ground plate (lower antenna element)
7 Speaker
8 Operation keys
9 microphone
10, 11, 34, 35 Feeding point
12, 13 feeder
14, 24, 25, 31, 33, 36 High frequency switch
15 Power supply unit
30, 32 Helical element
37, 38 Matching circuit
39 control unit
40 magnet switch
41 permanent magnet
42 Printed circuit board
43 Ground pattern (lower antenna element)
44 Wireless circuit
45 Level judgment unit

Claims (10)

An upper housing, a lower housing foldable around a hinge portion, an upper antenna element, a lower antenna element respectively incorporated in the upper housing, the lower housing, and one end electrically connected to the upper antenna element. And a feeder, the other end of which is electrically connected to the lower antenna element, wherein the upper antenna element and the lower antenna element operate as a dipole antenna. 2. The apparatus according to claim 1, wherein the upper antenna element is configured by a plurality of upper antenna elements, and the plurality of upper antenna elements are selectively switched and connected to one end of the feeding unit by switching means. The portable radio described. 3. The apparatus according to claim 2, further comprising a switching unit configured to electrically connect the plurality of upper antenna elements to the feeding unit or to electrically connect to the lower antenna element. The portable radio described. A first and a second upper antenna element, a half-wave element electrically connected to the second upper antenna element, and selectively the one of the first upper antenna element and the half-wave element. 3. The portable wireless device according to claim 2, further comprising a switching unit configured to electrically switch and connect to the power supply unit. A first and a second upper antenna element, and a first and a second half-wave element electrically connected to the first and the second upper antenna element, respectively, wherein the first and the second upper antenna elements are provided. 3. The portable wireless device according to claim 2, further comprising switching means for selectively switching and electrically connecting one of the antenna element and the first and second half-wave elements to the power supply unit. The portable wireless device according to claim 2, wherein each of the plurality of upper antenna elements is provided with an impedance matching unit individually corresponding to the plurality of upper antenna elements. A housing open / closed state detecting means for detecting whether the upper housing and the lower housing are open to each other; and a control means for controlling the switching means according to a detection result of the housing open / closed state detecting means. The portable wireless device according to any one of claims 2 to 5, wherein: 6. The portable wireless device according to claim 2, further comprising a control unit that determines the reception level of the wireless circuit unit and controls the switching unit to increase the reception level. The mobile phone according to any one of claims 1 to 8, wherein the upper antenna element and the lower antenna element are formed in a plate shape along a housing surface of the upper housing and the lower housing, respectively. transceiver. The lower antenna element is configured by a ground pattern on a printed circuit board disposed inside the lower housing, and a wireless circuit is provided on the circuit board, and the ground of the wireless circuit is electrically connected to the ground pattern. 10. The portable wireless device according to claim 9, wherein a power supply unit of the wireless circuit unit is electrically connected to the upper antenna element or the switching unit.

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