JP2006050136A - Mobile phone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile phone for realizing high antenna sensitivity when receiving a broadcast radio wave while selectively switching antennas with different operating modes corresponding to various operating states. <P>SOLUTION: A loop antenna element 7 being a magnetic field mode antenna element with a horizontal directivity characteristic is arranged along a width direction (Y axis direction) of the mobile phone 100 in the vicinity of a hinge 3 of a lower case 2 and connected to a high frequency switch 9 via a matching circuit 8. A television broadcast signal received by an earphone cable 12 serving as an electric field mode antenna element having a vertical directivity characteristic is given to the high frequency switch 9 via an earphone connector 13. An antenna switching control section 15 detects the received signal strength in a broadcast reception circuit 10 and selectively switches the high frequency switch 9 to the loop antenna element 7 or the earphone connector 13 in response to the received signal level. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mobile phone provided with a broadcast receiver for receiving broadcast radio waves, and more particularly to a mobile phone having an improved broadcast receiving antenna for receiving broadcast radio waves.

In recent years, mobile phones with a broadcast receiver equipped with a television receiving function (hereinafter simply referred to as mobile phones) have become widespread, and various improvements have been made to the television receiving antennas of these mobile phones. Therefore, the antenna characteristics are improved. For example, Patent Document 1 discloses a technology of a television receiving antenna in which a dipole antenna is constituted by a monopole antenna and a battery, and a high antenna gain can be obtained even if an antenna portion extending perpendicularly to a receiver is shortened. It is disclosed. Patent Document 2 discloses an antenna technique in which two loop antennas are arranged so as to be orthogonal to each other, and the characteristic is deteriorated due to the influence of the human body by switching the polarization in accordance with the use state when the human body is worn. It is disclosed. Further, Patent Document 3 discloses an antenna technique that can obtain a high antenna gain by switching a combination of two antennas according to a reception channel.
JP 2001-251131 A JP-A-10-84209 JP-A-6-113220

  However, in the technique disclosed in Patent Document 1 described above, since the main polarization of the antenna is vertical polarization, the sensitivity to horizontal polarization, which is the mainstream in television broadcast radio waves, cannot be increased. In the technique disclosed in Patent Document 2 above, the main polarization direction can be switched between two different directions. However, the user holds the mobile phone in hand, or the mobile phone is connected to the human body. It is not taken into consideration to ensure optimum antenna performance corresponding to various usage conditions such as close to or away from the human body. That is, since it is a magnetic field antenna, a sufficient gain cannot be obtained when it is away from the human body. Furthermore, since the loop antenna is large, the appearance as a mobile phone is not good. Further, the technique disclosed in Patent Document 3 described above cannot be applied to a mobile phone or the like because no consideration is given to the structure of a small antenna that can be mounted on a mobile phone.

  The present invention has been made in view of the above circumstances, and broadcasts that achieve high antenna sensitivity when receiving broadcast radio waves while selectively switching antennas with different operation modes corresponding to various usage conditions. An object of the present invention is to provide a mobile phone with a receiver.

  In order to achieve the above object, a mobile phone according to the present invention is a mobile phone including a broadcast receiver that receives broadcast radio waves, and operates in a magnetic field mode antenna element that operates in a magnetic field mode and in an electric field mode. Electric field mode antenna element, antenna switching means for selectively switching between magnetic field mode antenna element and electric field mode antenna element, broadcast receiving means for receiving broadcast radio waves, and switching control of antenna switching means according to the reception state of broadcast receiving means An antenna switching control means for performing the above is adopted.

  According to the mobile phone of the present invention, since the magnetic field mode antenna element and the electric field mode antenna element are selectively switched according to the reception state (that is, the received signal level) of the broadcast radio wave, the polarization diversity effect is effectively achieved. Can be obtained. Therefore, high antenna performance can always be realized when receiving broadcast radio waves. In addition, since the loop opening surface of the loop antenna element, which is a magnetic field mode antenna, is arranged orthogonal to the surface of the mobile phone, the user can receive broadcast radio waves by bringing the mobile phone close to the human body. Even when receiving radio waves away from the human body, high antenna performance can always be obtained.

  Further, according to the mobile phone of the present invention, the loop opening surface of the loop antenna element is arranged in parallel to the longitudinal direction of the mobile phone, and the loop antenna element is arranged to face the display unit of the mobile phone. Therefore, when the user views the broadcast radio wave using the mobile phone, high antenna performance can be obtained with respect to the horizontal polarization characteristic that is the main component of the broadcast radio wave. Furthermore, according to the mobile phone of the present invention, since the earphone cable or the helical antenna element is used as the electric field mode antenna element, even when the user uses the mobile phone close to the human body, the mobile phone is separated from the human body. Even when used, a high antenna performance is always obtained by the polarization diversity effect, and an uneven diversity effect is obtained.

  In other words, according to the present invention, when a television broadcast is viewed using a mobile phone with a broadcast receiver, the antenna performance is always high regardless of whether the mobile phone is close to or away from the human body. Is obtained. In other words, high antenna performance is always obtained regardless of the positional relationship where the mobile phone is placed in the vicinity of the human body or the orientation of the mobile phone, and a stable television image can be received.

  Hereinafter, some embodiments of a mobile phone with a broadcast receiver according to the present invention will be described in detail with reference to the drawings. In the drawings used in each embodiment, the same components are denoted by the same reference numerals, and redundant description will be omitted. In the following embodiments, a mobile phone with a broadcast receiver is simply referred to as a mobile phone.

  First, in order to facilitate understanding, an outline of a portable wireless terminal according to the present invention will be described. A portable wireless terminal according to the present invention is a mobile phone having a function of receiving broadcast radio waves, has a horizontal directivity characteristic with respect to the ground, operates in a magnetic field mode, and is vertically directed with respect to the ground. It has two antennas, an electric field mode antenna element that has characteristics and operates in an electric field mode. Then, the antenna switching means selects the antenna element with the higher received signal level according to the reception state of the broadcast radio wave. As a result, it is possible to always maintain high antenna sensitivity with respect to broadcast radio waves. Specifically, a loop antenna element is used as the magnetic field mode antenna element, an earphone cable is used as the electric field mode antenna element, and the antenna element with the higher received signal level is selected from either the loop antenna element or the earphone cable. Maintains high antenna characteristics.

<Embodiment 1>
FIG. 1 is a rear perspective view of the mobile phone according to Embodiment 1 of the present invention. 2 is an explanatory diagram of a loop antenna element in the mobile phone shown in FIG. 1, wherein (a) is a rear perspective view of a part of the mobile phone, (b) is a side perspective view of (a), and (c). FIG. 3 is a top perspective view of (a). 3 is an explanatory diagram of an earphone cable in the mobile phone shown in FIG.

  1 and 2 each show a coordinate system. In the following description, this coordinate system is used for designating the directivity direction of radio waves, and therefore, the definition of the coordinate system in each figure is here. explain. In the case of FIG. 1, when the index finger, middle finger, and thumb of the right hand are set at right angles, the middle finger is in the X-axis direction (direction from the back of the figure to the front of the paper), and the thumb is in the Y-axis direction (from left to right in the figure A coordinate system in which the index finger is directed in the Z-axis direction (the direction from the lower part to the upper part in the figure) is shown.

  The definition of the coordinate system shown in FIG. 2 is the same as that in FIG. That is, in FIG. 2A, the X axis (middle finger) is the direction from the back of the figure to the paper front, the Y axis (thumb) is the direction from the left to the right of the figure, and the Z axis (forefinger) is the lower part of the figure. The direction from the top to the top is shown. 2B, the Y axis (thumb) is the direction from the front to the back of the figure, the X axis (middle finger) is the direction from the left to the right of the figure, and the Z axis (forefinger) is the lower part of the figure. 2 (c), the Z-axis (forefinger) is directed from the front to the back of the drawing, the Y-axis (thumb) is directed from the left to the right, and the X-axis ( The middle finger) shows the direction from the bottom to the top of the figure.

  Hereinafter, the mobile phone according to the first embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3. FIG. As shown in FIG. 1, a mobile phone 100 according to Embodiment 1 is a foldable mobile phone having a structure in which an upper housing 1 and a lower housing 2 are supported by a hinge portion 3 so as to be rotatable. The upper housing 1 and the lower housing 2 are formed of a molded product made of a resin material that is an insulator. The communication antenna 4 disposed in the vicinity of the hinge portion 3 of the lower housing 2 is a wireless communication antenna of a mobile phone configured with, for example, a helical antenna element. The communication antenna 4 is supplied with power from a transmission / reception circuit 6 through a feeder line 5, and the transmission / reception circuit 6 transmits and receives radio communication radio waves from the mobile phone 100.

  The loop antenna element 7 (that is, the magnetic field mode antenna element) operates as a built-in antenna for television reception, and is disposed in the vicinity of the hinge portion 3 of the lower housing 2 along the width direction of the mobile phone, that is, the Y-axis direction. ing. The loop antenna element 7 is impedance matched by the matching circuit 8 in the range of about 470 MHz to 700 MHz which is a television broadcast frequency.

  The high frequency switch (antenna switching means) 9 is a high frequency switching circuit composed of, for example, a PIN diode or FET, and a matching circuit 8 is connected to one end thereof. The output terminal of the high frequency switch 9 is input to the broadcast receiving circuit 10. The broadcast receiving circuit (broadcast receiving means) 10 is a receiving circuit that receives television broadcast waves.

  The earphone 11 is for a user to insert into the ear and listen to the sound of the television, and is connected to the earphone connector 13 by an earphone cable 12. The audio signal output from the broadcast receiving circuit 10 is input to the earphone connector 13 via the audio signal line 14. The display unit 16 is a liquid crystal display device disposed on the surface of the upper housing 1, that is, the surface on the −X axis side (the back side of the paper). The video signal output from the broadcast receiving circuit 10 is input to the image processing unit 17 disposed inside the upper housing 1 through the hinge unit 3 through the video signal line 18, and the image processing unit 17 is displayed on the display unit 16. Control image display.

  The earphone cable 12 also operates as an external antenna (that is, an electric field mode antenna element) that transmits an audio signal and receives a television broadcast wave. The television broadcast radio wave received by the earphone cable 12 is input to the high frequency switch 9 via the earphone connector 13.

  The antenna switching control unit (antenna switching control means) 15 detects the received signal strength in the broadcast receiving circuit 10 and operates to switch the high frequency switch 9 according to the received signal level. For example, if the antenna switching control unit 15 is configured to operate so as to select the antenna having the higher received signal level out of the loop antenna element 7 or the earphone cable 12, the antenna characteristic always higher. An element can be selected.

  Next, the operation of the loop antenna element 7 will be described with reference to FIG. The loop antenna element 7 is formed of, for example, a conductor plate having a thickness of about 1 mm that is folded back when the width direction length L1 is 40 mm, the element height L2 is 10 mm, and the element width L3 is 10 mm. Further, the interval L4 between the feeding portions of the loop antenna element 7 is set to about 5 mm. Further, the loop antenna element 7 is fixed with a distance L5 from the circuit board 19 mounted on the lower housing 2 set to 2 mm.

  The loop opening surface 7 a of the loop antenna element 7 configured as described above is orthogonal to the surface of the mobile phone, that is, the circuit board 19. In general, a ground pattern is disposed on the entire surface of the circuit board 19, and therefore the loop opening surface 7 a of the loop antenna element 7 is orthogonal to the ground pattern of the mobile phone 100, that is, the ground plane.

  Further, the loop opening surface 7 a of the loop antenna element 7 is arranged in parallel to the width direction (Y-axis direction) of the mobile phone 100. In other words, the mobile phone 100 is arranged in parallel to the direction (that is, the Y-axis direction) orthogonal to the longitudinal direction (Z-axis direction). With this configuration, the radiation characteristic of the loop antenna element 7 is parallel to the width direction (Y-axis direction) of the mobile phone 100, that is, in the horizontal direction (Y-axis direction) in the arrangement of the mobile phone shown in FIG. Horizontal polarization characteristics can be obtained.

  Further, the loop antenna element 7 is disposed on the surface facing the surface on which the display unit 16 of the mobile phone 100 is disposed, that is, on the surface side in the + X axis direction in FIG. With this configuration, as the radiation characteristics of the loop antenna element 7, horizontal polarization is provided on the side facing the surface on which the display unit 16 is disposed (that is, the surface in the + X axis direction in FIG. 2B). A high antenna gain can be obtained.

  Next, the antenna operation of the earphone cable 12 will be described with reference to FIG. In FIG. 3, the outer ground conductor 20 is constituted by, for example, a net-like conductive wire that covers the audio signal line 21 so as to shield inside the earphone cable 12. The outer ground conductor 20 and the audio signal line 21 are connected to the earphone 11 in the earphone cable 12.

  The length of the earphone cable 12 is set to about 50 cm to 100 cm, for example. This length is about 0.8 to 2.3 wavelengths in the television broadcast reception band. The earphone cable 12 is connected to a circuit inside the mobile phone 100 when the insertion connector portion 22 is inserted into the earphone connector 13. The outer ground conductor 20 is connected to the internal ground of the mobile phone 100 via the coil 23, that is, the ground potential, so that the audio signal line 21 is shielded and shielded by the outer ground conductor 20 in a low frequency band that is an audio signal band. Is done.

  On the other hand, the outer ground conductor 20 is connected to the high frequency switch 9 through the matching circuit 24. Here, the inductance value of the coil 23 is set so that the impedance is sufficiently high in the television broadcast frequency band. With this configuration, the ground outer conductor 20 operates as an external antenna in an electric field mode for receiving television broadcast radio waves.

  The antenna operation of the mobile phone 100 configured as described above will be described with reference to FIGS. FIG. 4 is a conceptual diagram showing a state in which a television broadcast is viewed using the mobile phone shown in FIG. That is, FIG. 4 shows a state in which the user 25 holds the mobile phone 100 with his hand in front of the face and watches a television broadcast with the display unit 16 facing the face. At this time, the earphone 11 is inserted into the ear of the user 25, and the earphone cable 12 is hung from the ear to the mobile phone 100.

  In such a state, the loop antenna element 7 is arranged in front of the human body, that is, in the + X axis direction, and an antenna gain with high horizontal polarization is obtained in the front direction of the human body. Further, since the earphone cable 12 is hung in a substantially vertical direction, that is, in the −Z-axis direction, the outer ground conductor 20 in the earphone cable 12 operates as an antenna having a substantially vertical polarization characteristic.

  In this way, when the user 25 is watching television broadcast using the mobile phone 100, the loop antenna element 7 and the earphone cable 12 have different polarization characteristics of horizontal polarization and vertical polarization. When the two antennas (that is, the loop antenna element 7 and the earphone cable 12) are selected by the high frequency switch 9, the effect of polarization diversity can be obtained. In general, in a multi-wave propagation environment such as an urban area where there are many reflectors, a diversity effect of about 5 dB to 10 dB can be obtained by the above-described polarization diversity operation.

  FIG. 5 is a characteristic diagram showing the average gain of each antenna when the cellular phone shown in FIG. 1 is used. That is, FIG. 5 shows an average gain of the horizontal plane (XY plane) of the loop antenna element 7 and the earphone cable 12 when the user 25 is watching a television broadcast using the mobile phone 100 as shown in FIG. Is shown in a graph. In FIG. 5, the horizontal axis indicates the distance d [cm] (see FIG. 4) between the face of the user 25 and the display unit 16 of the mobile phone 100, and the vertical axis indicates the average gain [XY plane] [XY plane]. dB]. That is, the characteristic of FIG. 5 is a plot of the average gain on the horizontal plane (XY plane) when the distance d between the face of the user 25 and the display unit 16 of the mobile phone 100 is changed.

  In FIG. 5, graph (a) shows the average gain of loop antenna element 7, and graph (b) shows the average gain of earphone cable 12. As is clear from FIG. 5, the average gain (b) of the earphone cable 12 is the average of the loop antenna element 7 when the distance d between the face of the user 25 and the display unit 16 of the mobile phone 100 is about 10 cm or more. The gain (a) also becomes higher. On the other hand, in the range where the distance d is about 10 cm or less, the average gain (b) of the earphone cable 12 is lower than the average gain (a) of the loop antenna element 7.

  The reason why such a phenomenon occurs is that the loop antenna element 7 operates as a magnetic field mode antenna element, and the earphone cable 12 operates as an electric field mode antenna element. This is because the effects on

  The loop antenna element 7 operating as a magnetic field mode antenna operates as a reflector and electromagnetic interaction with the human body in a range where the distance d from the human body is about 0.2 wavelength (about 10 cm) or less. As a result, the radiation resistance is increased and the radiation efficiency is improved. For this reason, a human body effect in which the gain is improved in the vicinity of the human body such that the distance d between the mobile phone 100 and the human body is about 10 cm or less occurs.

  On the other hand, the earphone cable 12 operating as an electric field mode antenna exhibits high radiation efficiency when the distance d from the human body is about 0.2 wavelength (about 10 cm) or more, but when close to the human body, Since the radiation resistance decreases due to the electromagnetic interaction, radiation efficiency deteriorates rapidly. For this reason, the gain is improved when the mobile phone 100 is separated from the human body by about 10 cm or more.

  By appropriately selecting the loop antenna element 7 and the earphone cable 12 from such antenna characteristics, even when the mobile phone 100 is close to the human body, the mobile phone 100 is separated from the human body when viewing the television broadcast. Even in this case, high antenna performance can always be obtained. For this reason, either one of the antennas is selectively used as compared with the case where only one of the loop antenna element 7 (magnetic field mode antenna element) and the earphone cable 12 (electric field mode antenna element) is fixedly used. In the case of using for a human body, a switching effect for a human body influence of about 3 dB to 10 dB can be obtained. Furthermore, it goes without saying that such a switching effect on the influence of the human body exhibits an effect of further enhancing the polarization diversity effect.

  In the first embodiment, the loop antenna element 7 is built in the lower housing 2, but the mobile phone 100 of the present invention is not limited to such a configuration, and the user's hand in the usage state is not limited. As long as the loop antenna element 7 is arranged at a position not covered by the antenna, any configuration may be used. Further, the magnetic field mode antenna element is not limited to the loop antenna element 7 and may be any antenna element as long as the antenna operates in a magnetic field mode such as a slot antenna element. Furthermore, the electric field mode antenna element is not limited to the configuration built in the earphone cable 12, and may be any antenna that operates in an electric field mode, such as a monopole antenna element. The arrangement direction of the loop antenna element 7 is not limited to the direction of the first embodiment. For example, when the loop opening surface is arranged in parallel to the longitudinal direction of the mobile phone 100, the effect of polarization diversity is reduced. However, since the switching effect with respect to the influence of the human body can be obtained, such a parallel arrangement can also be achieved.

  One or both of the broadcast receiving antennas may be shared with the mobile phone communication antenna. For example, the communication antenna 4 may be shared as an electric field mode antenna for a broadcast receiving antenna. Further, the loop antenna element 7 may be shared as a built-in antenna for mobile phone communication. Furthermore, the method of switching between the magnetic field mode antenna element and the electric field mode antenna element is not limited to the method of switching according to the reception level. For example, the user may manually switch by operating the mobile phone 100 or the earphone. When the cable 12 is inserted into the earphone connector 13, it may be configured to be forcibly switched to the earphone cable 12 side. In the first embodiment, the configuration example of the folding cellular phone is shown. However, the magnetic field mode antenna and the electric field mode antenna are also used in the straight type cellular phone that is not divided into the upper housing 1 and the lower housing 2. Needless to say, the same effects as those of the first embodiment can be obtained by appropriately arranging and switching.

<Embodiment 2>
FIG. 6 is a rear perspective view of the mobile phone according to Embodiment 2 of the present invention. The cellular phone of the second embodiment shown in FIG. 6 is different from the cellular phone of the first embodiment shown in FIG. 1 in that a loop antenna element 7 for television broadcasting, a matching circuit 8, a high frequency switch 9, and a broadcast receiving circuit 10 are used. And the antenna switching control unit 15 and the like are moved from the lower housing 2 to the upper housing 1, and the communication antenna 4 of the lower housing 2 is removed, and the helical antenna element 28 and the matching circuit 29 are connected to the upper housing 1. This is the point.

  That is, in FIG. 6, the loop antenna element 7 is disposed at the lower surface of the upper housing 1 on the surface opposite to the surface on which the display unit 16 is disposed, that is, on the + X axis side surface in FIG. 6. Also in this embodiment, the loop opening surface of the loop antenna element 7 is orthogonal to the surface of the mobile phone and is parallel to the width direction (Y-axis direction) of the mobile phone. In addition, the helical antenna element 28 is configured by a coiled conductor that operates as a normal mode helical antenna. Impedance matching is achieved by the matching circuit 29, and the helical antenna element 28 is insensitive to the ground in the upper housing 1, that is, the ground potential. It is configured to be balancedly fed. The length of the helical antenna element 28 is set to about 5 cm, for example.

  The thus configured helical antenna element 28 operates as an electric field mode antenna element, and its main polarization direction is the vertical direction, that is, the Z-axis direction. The helical antenna element 28 and the loop antenna element 7 are configured to be selected and operated by the high frequency switch 9 as in the case of FIG. By configuring in this way, the polarization diversity effect and the switching effect on the influence on the human body can be obtained as in the case of the first embodiment, and the operation can always be performed with the optimum antenna characteristics. Here, if the wireless communication circuit and the antenna of the mobile phone are built in the lower housing 2, it is possible to secure a distance from the television receiving antenna. Mutual interference such as influence can be reduced. The electric field mode antenna is not limited to a helical antenna element, and a meandering conductor element, a monopole element, or a whip element may be used.

<Embodiment 3>
FIG. 7 is a perspective view of the mobile phone according to Embodiment 3 of the present invention. FIG. 7 shows a state in which the upper housing 1 and the lower housing 2 of the foldable mobile phone are closed. The loop antenna element 7 is disposed in the vicinity of the hinge portion 3 of the upper housing 1 on the surface facing the lower housing 2, that is, the surface on the + X axis side. Also in this case, the loop opening surface of the loop antenna element 7 is orthogonal to the surface of the mobile phone and is parallel to the width direction (Y-axis direction) of the mobile phone.

  In addition, the earphone 11 is connected to the earphone connector 13 by the earphone cable 12, and the earphone connector 13 is disposed, for example, on the side surface of the upper housing 1. The user stores the cellular phone configured as described above in the breast pocket in a closed state. FIG. 8 is a conceptual diagram showing a state in which a mobile phone with a closed broadcast receiver as shown in FIG. 7 is put in the chest pocket of the user and listening to the broadcast.

  In FIG. 8, the user 30 points the upper housing 1 of the mobile phone 100 in the front direction (+ X-axis direction) of the user 30 and the width direction (Y-axis direction) of the mobile phone 100 horizontally, that is, mobile phone. The telephone 100 is housed in the breast pocket 31 with the longitudinal direction thereof oriented in the vertical direction (−Z axis direction). The user 30 inserts the earphone 11 into the ear, and the earphone cable 12 hangs down to the position of the mobile phone. Such a state shows a typical state in which the user 30 puts the mobile phone 100 in the breast pocket 31 and listens only to the broadcast wave sound.

  At this time, when the loop antenna element 7 is oriented in the front direction of the user 30, that is, in the + X axis direction, both the polarization diversity effect and the switching effect on the human influence as described in the first embodiment can be obtained. become. If the lower housing 2 of the mobile phone 100 is placed in the breast pocket 31 in the front direction of the user 30, that is, in the + X axis direction, the antenna performance deteriorates because the loop antenna element 7 is directed to the user side. In this case, however, the earphone cable 12 ensures a certain antenna performance. As described above, according to the mobile phone 100 of the third embodiment, regardless of the orientation in which the mobile phone 100 is placed in the breast pocket 31, that is, it is affected by the positional relationship and orientation in which the mobile phone 100 is placed near the human body. And high antenna performance can always be ensured.

  As described above, the mobile phone with a broadcast receiver according to the present invention is in the vicinity of the human body, such as when the mobile phone is close to the human body or away from the human body in the state of watching the television broadcast. Since a high antenna performance is always obtained regardless of the positional relationship and orientation placed on the mobile phone, it is possible to construct a mobile phone with a broadcast receiver that improves the reception performance.

1 is a rear perspective view of the mobile phone according to Embodiment 1 of the present invention. Explanatory drawing of the loop antenna element in the mobile phone shown in FIG. Explanatory drawing of the earphone cable in the mobile phone shown in FIG. The conceptual diagram which shows the state which views a television broadcast using the mobile telephone shown in FIG. Characteristic diagram showing average gain of each antenna when the cellular phone shown in FIG. 1 is used Rear perspective view of the mobile phone according to Embodiment 2 of the present invention Perspective view of mobile phone according to Embodiment 3 of the present invention The conceptual diagram which shows the state which puts the mobile telephone shown in FIG. 7 in a breast pocket, and listens to broadcast

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper housing | casing 2 Lower housing | casing 3 Hinge part 4 Communication antenna 5 Feed line 6 Transmission / reception circuit 7 Loop antenna element (magnetic field mode antenna element)
8, 24, 29 Matching circuit 9 High frequency switch 10 Broadcast receiving circuit 11 Earphone 12 Earphone cable (electric field mode antenna element)
DESCRIPTION OF SYMBOLS 13 Earphone connector 14,21 Audio | voice signal line 15 Antenna switching control part 16 Display part 17 Image processing part 18 Video signal line 19 Circuit board 20 Ground conductor 22 Insertion connector part 23 Coil 28 Helical antenna element 100 Mobile telephone

Claims (7)

A mobile phone equipped with a broadcast receiver for receiving broadcast radio waves,
A magnetic field mode antenna element operating in a magnetic field mode;
An electric field mode antenna element operating in electric field mode;
Antenna switching means for selectively switching the magnetic field mode antenna element and the electric field mode antenna element;
Broadcast receiving means for receiving the broadcast radio wave;
Antenna switching control means for performing switching control of the antenna switching means according to the reception state of the broadcast receiving means;
A mobile phone comprising:   The mobile phone according to claim 1, wherein the antenna switching control means uses a received signal level of the broadcast radio wave to determine the reception state.   3. The mobile phone according to claim 1, wherein the magnetic field mode antenna element is configured such that a loop opening surface of a loop antenna element is arranged orthogonal to a surface of the mobile phone. .   The mobile phone according to claim 3, wherein the loop antenna element has the loop opening surface disposed in parallel to a longitudinal direction of the mobile phone.   5. The mobile phone according to claim 3, wherein the loop antenna element is disposed on a surface side facing a surface on which a display unit of the mobile phone is disposed.   The mobile phone according to any one of claims 1 to 5, wherein the electric field mode antenna element is configured by an earphone cable for connecting an earphone.   6. The mobile phone according to claim 1, wherein the electric field mode antenna element is a helical antenna element.

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