WO2006013843A1

WO2006013843A1 - Cellular phone

Info

Publication number: WO2006013843A1
Application number: PCT/JP2005/014091
Authority: WO
Inventors: Yukari Yamazaki; Yutaka Saito; Yoshio Koyanagi; Kiyoshi Egawa; Hiroyuki Sasaki
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2004-08-03
Filing date: 2005-08-02
Publication date: 2006-02-09
Also published as: JP2006050136A

Abstract

A cellular phone having a broadcasting receiver which provides a high antenna sensitivity when receiving airwaves, by selectively switching antennas in different operation modes, corresponding to various use conditions. A loop antenna element (7), which is a magnetic field mode antenna element having a horizontal directivity characteristic, is arranged along a width direction (Y axis direction) of a cellular phone (100) near a hinge part (3) of a lower case body (2), and is connected to a high frequency switch (9) through a matching circuit (8). A television broadcasting signal received by an earphone cable (12), which is an electric field mode antenna element having a vertical directivity characteristic, is inputted to a high frequency switch (9) through an earphone connector (13). An antenna switching control part (15) detects receiving signal intensity at a broadcast receiving circuit (10), and operates to selectively switch the high frequency switch (9) to the loop antenna element (7) or the earphone connector (13) in response to the receiving signal level.

Description

Specification

Mobile phone

Technical field

TECHNICAL FIELD [0001] 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.

Background art

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 there are various types of television receiving antennas for these mobile phones. Improvements have been made to improve antenna characteristics.

[0003] For example, in Patent Document 1, a dipole antenna is constituted by a monopole antenna and a battery, and a high antenna gain can be obtained even if the antenna portion extending perpendicularly to the receiver is shortened. Antenna technology is disclosed.

[0004] In Patent Document 2, two loop antennas are arranged so as to be orthogonal to each other, and the polarization is switched according to the use state when the human body is worn, thereby preventing the deterioration of characteristics due to the influence of the human body. Antenna technology has been disclosed.

[0005] 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.

Patent Document 1: Japanese Patent Laid-Open No. 2001-251131

Patent Document 2: Japanese Patent Laid-Open No. 10-84209

Patent Document 3: JP-A-6-113220

Disclosure of the invention

Problems to be solved by the invention

However, in the technique disclosed in Patent Document 1 described above, since the main polarization of the antenna is a vertical polarization, sensitivity to horizontal polarization, which is the mainstream in television broadcast radio waves, is known. I ca n’t make it high.

[0007] In the technique disclosed in Patent Document 2 above, the main polarization direction is divided into two different directions. However, it is optimal for various usage situations, such as when the user holds the mobile phone by hand, or when the mobile phone is close to or away from the human body. It is not considered to ensure the antenna performance. In other words, since it is a magnetic field antenna, sufficient gain cannot be obtained when human strength is separated. Furthermore, because the loop antenna is large! /, The appearance as a mobile phone is good.

[0008] 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.

[0009] An object of the present invention is to provide a mobile phone with a broadcast receiver that realizes high antenna sensitivity when receiving broadcast radio waves while selectively switching antennas having different operation modes corresponding to various use states. Is to provide.

Means for solving the problem

[0010] A mobile phone according to the present invention is a mobile phone device including a broadcast receiver that receives broadcast radio waves, and a magnetic field mode antenna element that operates in a magnetic field mode and an electric field mode antenna element that operates in an electric field mode. An antenna switching means for selectively switching between the magnetic field mode antenna element and the electric field mode antenna element, a broadcast receiving means for receiving broadcast radio waves, and an antenna switching for performing switching control of the antenna switching means according to the reception state of the transmission / reception means. A configuration including a replacement control unit is employed.

The invention's effect

[0011] According to the mobile phone of the present invention, the magnetic field mode antenna element and the electric field mode antenna element are selectively switched according to the reception state of broadcast radio waves (that is, the received signal level). A wave diversity effect 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 antenna, is arranged perpendicular 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 if you are receiving broadcast radio waves away from your physical strength,

V, antenna performance can be obtained.

[0012] Also, according to the mobile phone of the present invention, the loop opening surface of the loop antenna element is portable. Since the loop antenna element is arranged in parallel to the longitudinal direction of the telephone and is opposed to the display unit of the portable telephone, the user can watch the broadcast radio wave using the portable telephone. Therefore, high antenna performance can be obtained with respect to the horizontal polarization characteristic, which is the main component of broadcast radio waves. Furthermore, according to the mobile phone of the present invention, since the earphone cable is used as the electric field mode antenna element or the helical antenna element is used, even when the user uses the mobile phone close to the human body, Even when they are used separately, high antenna performance can always be obtained by the polarization diversity effect, and the polarization diversity effect can be obtained.

[0013] That is, according to the present invention, when a television broadcast is viewed using a mobile phone with a broadcast receiver, even when the mobile phone is close to the human body, the mobile phone is separated from the human body. Even in this case, high antenna performance can always be obtained. In other words, 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, high antenna performance is always obtained and stable television images can be received.

Brief Description of Drawings

FIG. 1 is a rear perspective view of a mobile phone according to Embodiment 1 of the present invention.

[FIG. 2A] Rear perspective view of a part of the mobile phone shown in FIG.

[FIG. 2B] Side perspective view of a portion of the mobile phone shown in FIG.

FIG. 2C is a top perspective view of a part of the mobile phone shown in FIG.

FIG. 3 is an explanatory diagram of an earphone cable in the mobile phone shown in FIG.

FIG. 4 is a conceptual diagram showing a state in which a television broadcast is viewed using the mobile phone shown in FIG. 1. FIG. 5 is a characteristic diagram showing an average gain of each antenna when the mobile phone shown in FIG. 1 is used. 6] Rear perspective view of mobile phone according to embodiment 2 of the present invention

FIG. 7 is a perspective view of a mobile phone according to Embodiment 3 of the present invention.

FIG. 8 is a conceptual diagram showing a state in which the mobile phone shown in FIG. 7 is put in a breast pocket and listening to a broadcast.

BEST MODE FOR CARRYING OUT THE INVENTION

[0015] 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. The same structure is used in the drawings used in each embodiment. Components are given the same reference numerals, and duplicate descriptions are omitted. In each of the following embodiments, a mobile phone with a broadcast receiver is simply called a mobile phone.

[0016] First, in order to facilitate understanding, an outline of a portable wireless terminal in the present invention will be described. The portable wireless terminal according to the present invention is a portable telephone having a function of receiving broadcast radio waves, has a horizontal directivity characteristic with respect to the ground, and operates in a magnetic field mode. It has two antennas, an electric field mode antenna element that has vertical directivity and operates in electric field mode.

[0017] 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 a 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 the loop antenna element or the earphone cable. Select and maintain high antenna characteristics and condition.

[0018] (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 the loop antenna element in the mobile phone shown in FIG. 1. FIG. 2A is a rear perspective view of a part of the mobile phone, FIG. 2B is a side perspective view of FIG. 2A, and FIG. FIG. Furthermore, FIG. 3 is an explanatory diagram of the earphone cable in the mobile phone shown in FIG.

[0019] Note that the forces shown in the coordinate systems in FIGS. 1 and 2 are used in the following description to designate the directivity direction of the waves. The definition of is described. 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 (the reverse side of the figure is also the direction of the force on the paper surface), and the thumb is in the Y-axis direction (left side of the figure). A coordinate system is shown in which the index finger is oriented in the Z-axis direction (the direction from the bottom to the top in the figure).

[0020] The definition of the coordinate system shown in FIG. 2 is the same as in FIG. In other words, in Fig. 2A, the X-axis (middle finger) is the direction of the paper in the direction of the paper, the Y-axis (thumb) is the direction of force from the left to the right, and the Z-axis (forefinger) is the bottom The direction of force is indicated from the top to the top. In Figure 2B, the Y axis ( The thumb) shows the direction of the paper surface in the direction of the paper, the X axis (middle finger) shows the direction of the left force of the figure in the right direction, and the Z axis (forefinger) shows the direction of the lower force in the figure. In 2C, the Z-axis (forefinger) is facing the paper surface in the direction of the paper, the Y-axis (thumb) is the direction of the left force in the diagram, and the X-axis (middle finger) is from the bottom of the figure. The direction toward the top is shown.

Hereinafter, the mobile phone according to the first embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG. As shown in FIG. 1, the 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. is there. The upper casing 1 and the lower casing 2 are formed of molded products made of a resin material that is an insulator.

[0022] The communication antenna 4 disposed in the vicinity of the hinge portion 3 of the lower housing 2 is an antenna for wireless communication of a mobile phone constituted by, for example, a helical antenna element. Communication antenna

4 is fed from a transmission / reception circuit 6 via a feeder line 5, and the transmission / reception circuit 6 transmits and receives radio communication radio waves from the mobile phone 100.

[0023] The loop antenna element 7 (that is, the magnetic field mode antenna element) operates as an internal antenna for television reception, and is located in the width direction of the mobile phone, that is, in the Y-axis direction, near the hinge portion 3 of the lower housing 2. Are arranged along. 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 the 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 arranged 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 enters the image processing unit 17 disposed inside the upper housing 1 through the video signal line 18 through the hinge unit 3. The image processing unit 17 controls the image display on the display unit 16.

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. Television broadcast radio waves received by the earphone cable 12 are input to the high frequency switch 9 via the earphone connector 13.

[0027] The antenna switching control unit (antenna switching control means) 15 operates to detect the received signal strength in the broadcast receiving circuit 10 and to switch the high frequency switch 9 according to the received signal level. For example, if the antenna switching control unit 15 is operated so as to select the antenna having the higher received signal level out of either the loop antenna element 7 or the earphone cable 12, the antenna characteristics are always high. This 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 composed of a conductor plate having a thickness of about 1 mm, which 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. In addition, the distance L4 between the feeding parts 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.

[0029] The loop opening surface 7a 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. A circuit pattern is generally arranged on the entire surface of the circuit board 19. 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 surface.

In addition, loop opening surface 7 a of loop antenna element 7 is arranged in parallel to the width direction (Y-axis direction) of 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. [0031] Further, loop antenna element 7 is disposed on the surface opposite to the surface on which display unit 16 of mobile phone 100 is disposed, that is, on the surface side in the + X-axis direction in FIG. 2B. With this configuration, the radiation characteristics of the loop antenna element 7 are such that the horizontally polarized wave is reflected on the surface facing the surface on which the display unit 16 is disposed (that is, the surface in the + X axis direction in FIG. 2B). 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 formed of, for example, a net-like conductor that covers the audio signal line 21 within the earphone cable 12 so as to shield it. The outer ground conductor 20 and the audio signal line 21 are connected to the earphone 11 in the earphone cable 12.

[0033] 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 by inserting the insertion connector portion 22 into the earphone connector 13. The ground outer conductor 20 is connected to the ground inside the mobile phone 100 via the coil 23, that is, the ground potential, so that the audio signal line 21 is shielded by the ground outer conductor 20 in the low frequency band which is an audio signal band. Shielded.

On the other hand, the outer ground conductor 20 is connected to the high-frequency switch 9 via 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 the electric field mode and receives television broadcast radio waves.

The antenna operation of mobile phone 100 configured as described above will be described with reference to FIG. 4 and FIG. 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 in front of the face by hand and watches the 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 up to the ear strength mobile phone 100.

[0036] In such a state, the loop antenna element 7 is disposed in front of the human body, that is, in the + X-axis direction, and has high horizontal polarization and antenna gain in the front direction of the human body. can get. In addition, since the earphone cable 12 is suspended in a substantially vertical direction, that is, in the Z-axis direction, the ground outer conductor 20 in the earphone cable 12 operates as an antenna having a substantially vertical polarization characteristic.

[0037] In this manner, when the user 25 is watching a television broadcast using the mobile phone 100, the loop antenna element 7 and the earphone cable 12 have different polarization characteristics with different horizontal polarization and vertical polarization. By selecting these two antennas (that is, the loop antenna element 7 and the earphone cable 12) using 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: LOdB can be obtained by the above-mentioned polarization diversity operation.

FIG. 5 is a characteristic diagram showing the average gain of each antenna when the mobile phone shown in FIG. 1 is used. In other words, FIG. 5 shows the horizontal plane (XY plane) of the loop antenna element 7 and the earphone cable 12 when the user 25 watches the television broadcast using the mobile phone 100 as shown in FIG. The average gain 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 on the horizontal plane (XY plane) [ In other words, the characteristic of Fig. 5 shows the average gain of 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. It is a plot.

In FIG. 5, the solid line ((a) in the figure) shows the average gain of the loop antenna element 7, and the dotted line ((b) in the figure) shows the average gain of the earphone cable 12. As is clear from FIG. 5, 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 average gain (b) of the earphone cable 12 is 7 as a loop antenna element. The average gain (a) is also higher. On the other hand, when 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.

[0040] This phenomenon occurs because 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 influence on the antenna operation that is affected by physical strength is different. [0041] The loop antenna element 7 operating as a magnetic field mode antenna operates as a reflector as well as acts as an electromagnetic wave with respect to the human body in a range where the distance d between the human body and the human body is about 0.2 wavelength (about 10 cm) or less. Radiation efficiency is improved due to higher radiation resistance due to mechanical interaction. 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.

[0042] 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, As the radiation resistance decreases due to the electromagnetic interaction, the radiation efficiency deteriorates rapidly. For this reason, the gain is improved when the mobile phone 100 is separated by about 10 cm or more.

[0043] 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 in the state of viewing the television broadcast, Even when they are far away from each other, high antenna performance can always be obtained. For this reason, either one of the loop antenna element 7 (magnetic field mode antenna element) or the earphone cable 12 (electric field mode antenna element) is selectively used as compared to the case where only one is fixedly used. When it is used for 3dB, the switching effect for the human body effect of 3dB force is also about 10dB. Furthermore, it goes without saying that such a switching effect on the human body effect can further enhance the polarization diversity effect described above.

In the first embodiment, the force in which the loop antenna element 7 is built in the lower housing 2 The mobile phone 100 of the present invention is not limited to such a configuration. Any configuration is possible as long as the loop antenna element 7 is arranged at a position that is not covered by the user's hand.

In addition, the magnetic field mode antenna element may be any antenna element as long as it is an antenna that operates in a magnetic field mode, such as a slot antenna element that is not limited to the norepe antenna element 7.

[0046] Furthermore, the electric field mode antenna element is not limited to the configuration built in the earphone cable 12, but may be any antenna that operates in an electric field mode, such as a monopole antenna element. Yes.

[0047] Further, 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 polarization diversity Although the effect is low, a switching effect on the influence of the human body can be obtained, so such a parallel arrangement can also be achieved.

[0048] One or both of the broadcast receiving antennas may be shared with the antenna for mobile phone communication. For example, the communication antenna 4 may be shared as an electric field mode antenna for a broadcast receiving antenna. Also, share the loop antenna element 7 as a built-in antenna for mobile phone communication.

[0049] Further, 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, and for example, the user may manually switch by operating the mobile phone 100. However, when the earphone cable 12 is inserted into the earphone connector 13, it is configured so that it can be forcibly switched to the earphone cable 12 side.

[0050] In the first embodiment, the configuration example of the foldable mobile phone is shown, but the magnetic field mode antenna is also used in the straight type mobile 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 the electric field mode antenna.

[0051] (Embodiment 2)

FIG. 6 is a rear perspective view of the mobile phone according to Embodiment 2 of the present invention. The mobile phone of Embodiment 2 shown in FIG. 6 differs from the mobile phone of Embodiment 1 shown in FIG. 1 in that a loop antenna element 7 for television broadcasting, a matching circuit 8, a high-frequency switch 9, The circuit 10 and the antenna switching control unit 15 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 is aligned with the upper housing 1. The circuit 29 is provided.

That is, in FIG. 6, the loop antenna element 7 is arranged at the lower end portion of the upper housing 1 on the surface opposite to the surface on which the display portion 16 is arranged, that is, on the + X-axis side surface in FIG. ing. [0053] Also in this embodiment, the loop opening surface of the loop antenna element 7 is orthogonal to the surface of the mobile phone and parallel to the width direction (Y-axis direction) of the mobile phone. The helical antenna element 28 is composed of a coiled conductor that operates as a normal mode helical antenna. Impedance matching is achieved by the matching circuit 29 and the ground in the upper housing 1, that is, the ground potential. Therefore, it is configured to be unbalanced. The length of the helical antenna element 28 is set to about 5 cm, for example.

The helical antenna element 28 configured as described above operates as an electric field mode antenna element, and its main polarization direction is the vertical direction, that is, the Z-axis direction. Further, 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.

[0055] With this configuration, the polarization diversity effect and the switching effect on the human body effect can be obtained as in the case of the first embodiment, and the antenna can always be operated with the optimum antenna characteristics. Can do. Here, if the wireless communication circuit and antenna of the mobile phone are built in the lower housing 2, the distance from the television receiving antenna can be secured. Mutual interference such as effects 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 folding mobile phone are closed. The loop antenna element 7 is arranged on the surface facing the lower housing 2 in the vicinity of the hinge portion 3 of the upper housing 1, that is, on 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 on, for example, a side surface of the upper housing 1. The user stores the cellular phone configured as described above in a breast pocket in a closed state. Figure 8 is the same as Figure 7. FIG. 3 is a conceptual diagram showing a state in which a mobile phone with a closed broadcast receiver as shown in FIG.

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. The mobile phone 100 is stored horizontally in the chest pocket 31 with the longitudinal direction of the mobile phone 100 oriented vertically (one 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 chest pocket 31 and listens to only the sound of the broadcast wave.

[0059] 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, the effects of the polarization diversity as described in the first embodiment and the switching effect on the human body effect are obtained. You will get both. If the lower housing 2 of the mobile phone 100 is placed in the breast pocket 31 facing the front direction of the user 30, that is, in the + X-axis direction, the loop antenna element 7 is directed toward the user side, so that the antenna Force that degrades performance In this case, 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. It is always possible to ensure high antenna performance.

[0060] This specification is based on Japanese Patent Application No. 2004-226657 filed on Aug. 3, 2004. All this content should be included here.

Industrial applicability

[0061] As described above, the mobile phone with a broadcast receiver according to the present invention can be used when the mobile phone is in close proximity to the human body or when the mobile phone is in a state of watching / browsing the television broadcast! High antenna performance can always be obtained regardless of the positional relationship and orientation where the mobile phone is placed in the vicinity of the human body, such as when it is far away, so it is possible to build a mobile phone with a broadcast receiver that improves reception performance. .

Claims

The scope of the claims

[1] 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 between the magnetic field mode antenna element and the electric field mode antenna element;

Broadcast receiving means for receiving the broadcast radio wave;

An antenna switching control unit that performs switching control of the antenna switching unit according to a reception state of the broadcast receiving unit.

2. The mobile phone according to claim 1, wherein the antenna switching control means uses a reception 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.

4. The mobile phone according to claim 3, wherein the loop antenna element has the loop opening surface arranged 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 facing the surface on which the display unit of the mobile phone is disposed.

6. The mobile phone according to claim 1, wherein the electric field mode antenna element is constituted by an earphone cable for connecting an earphone!

7. The mobile phone according to claim 1, wherein the electric field mode antenna element is a helical antenna element.