JP2001326513A - Mobile phone - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a mobile phone provided with an antenna which suppresses the polarization loss due to the difference in the polarization plane of the arriving radio wave even during an actual call with little influence of the human body. SOLUTION: A wireless unit is provided inside a housing 11 having a microphone 13 and a speaker 12 on its surface, and is fixedly arranged on the upper part of the housing 11 and connected to the wireless unit.
A first antenna unit 16 provided with a first antenna element having an electrical length of approximately 1/4 wavelength at a used frequency
And a second antenna element having an electrical length of approximately 波長 wavelength, which is slidably disposed on the back surface of the housing 11 and is disposed substantially orthogonal to the arrangement direction of the microphone 13 and the speaker 12. The second antenna element is excited by being capacitively coupled to the first antenna element when the excited antenna section 17 is pulled out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone used while holding it on the side of a human head during a call.

[0002]

2. Description of the Related Art In the field of portable radios such as portable telephones, various types of mobile communication terminals using a quasi-microwave band have been spotlighted in recent years. With the miniaturization of the shape of the terminal, it is common to perform communication while holding the terminal on the side of the human head during voice communication. FIG. 9 is a perspective view showing an example of a conventional mobile phone, and FIG. 10 is a view showing an actual use state of the mobile phone.

In FIG. 9, a mobile phone 90 includes a housing 91 having a built-in radio unit (not shown), and a user interface including a speaker 92, a microphone 93, keys 94, a liquid crystal display 95, and the like on the surface of the housing 91. It has a face part, and further has an antenna 99 that can be pulled out and stored in the upper part of the housing 91. The antenna 99 has a first antenna 98 formed of a rod-shaped conductor having conductivity, and a second antenna 97 formed of a coil and the like disposed at an upper end of the first antenna 98. When the antenna 99 is pulled out, the first antenna 98 operates. When the antenna 99 is housed, the first antenna 98 is housed in the housing 91.
Only 7 works.

FIG. 10 shows an example of use of a portable telephone in an actual call state. In a place where the electric field strength is weak, the user first pulls out the first antenna 98 from the housing 91, puts the speaker 92 into the ear, and the microphone. The user talks while holding the body 93 near the mouth and holding it on the side of the human head 100. Therefore, the antenna 99 is held at an inclination of about 30 degrees with respect to the horizontal plane, and the antenna 99 itself is farther away from the head than when the first antenna 98 is retracted. Human head 1
Thus, the effects of shielding, attenuation, and the like due to 00 can be reduced.

[0005]

However, radio waves radiated from the base station are vertically polarized waves. Reflection of radio waves depending on the route of radio waves from the base station to the mobile phone,
A horizontal polarization may be present in the radio wave received by the mobile phone due to diffraction or the like, but the vertical polarization is also dominant. In addition, in the case of a service that communicates in a very small area such as a micro cell or pico cell in recent years, there is a high possibility that the base station and the mobile phone are almost in line of sight, and scattering of polarized waves due to reflection, diffraction, etc. This is unlikely to occur, and the vertical polarization, which is the polarization plane of the base station, becomes more dominant.

Therefore, in the conventional portable telephone, the first
It is possible to reduce human body loss such as radio wave shielding and attenuation by the human head 100 by pulling out the antenna 98 from the housing 91 as described above. The polarization loss caused by the inclination of about 60 degrees (about 30 degrees with respect to the horizontal direction) is a problem. That is, the receiving surface of the antenna 99 of the mobile phone that receives the vertically polarized wave radiated from the base station is inclined by about 60 degrees from the vertical surface, and is closer to the receiving surface of the horizontally polarized wave. The receiving sensitivity deteriorates. Conversely, the radio wave radiated from the mobile phone antenna is also about 60
Since the polarized light having a degree of inclination becomes dominant, the horizontally polarized wave becomes stronger than the vertically polarized wave desired by the base station, and the loss of the transmission radio wave also increases. Furthermore, when it is determined that the receiving sensitivity is poor during a call, a very complicated operation such as holding the mobile phone with one hand and pulling out the antenna with the other hand has to be performed.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has little influence of the human body on transmitted / received radio waves. It is an object of the present invention to provide a mobile phone capable of suppressing a polarization loss caused by a difference in wavefront inclination and further allowing an antenna to be pulled out with a single touch. That is,

A first mobile phone according to the present invention has a microphone and a speaker on the surface of a housing of the mobile phone, has a radio unit in the housing, and communicates with the mobile phone held on the side of the human head. A first antenna element fixedly disposed on the upper part of the housing and connected to the radio unit and having an electrical length of approximately １ ／ wavelength at a used frequency; A plate-like driven antenna portion slidably disposed on the back surface and having a second antenna element disposed therein, and when the driven antenna portion is pulled out, the second antenna element is It is characterized by being excited by capacitive coupling with the first antenna element.

The second antenna element in the plate-like excited antenna is excited by the first antenna element via capacitive coupling, and a desired polarization determined by the second antenna element Characteristics close to the above can be realized. In addition, it is possible to operate the antenna withdrawing or storing with one hand during a voice call.

A second mobile phone according to the present invention is the first mobile phone according to the present invention, wherein the second antenna element is arranged in a direction substantially orthogonal to a direction in which the microphone and the speaker are arranged. It is characterized by being constituted by a conductive member disposed and having an electrical length of approximately 波長 wavelength at the operating frequency.

In the case of voice communication with a real human body, the direction in which the microphone and the speaker are arranged is inclined about 60 degrees with respect to the vertical direction, and the direction of the second antenna element orthogonal to the direction is the vertical direction. About 30 degrees with respect to. When the excited antenna is pulled out, the second antenna element coupled by capacitance is excited from the first antenna element, and emits a radio wave of a polarization inclined at an angle of about 30 degrees from a substantially vertical direction. The relative angle between the radio wave and the plane of polarization (vertical direction) can be reduced.

A third mobile phone according to the present invention is characterized in that, in the second mobile phone according to the present invention, a bent portion is provided at both ends or one end of the conductive member. It is what it was.

The distance between the first antenna element and the second antenna element can be increased even when the excited antenna portion is pulled out largely by bending the conductive member constituting the second antenna element. Can be narrowed, a large capacitive coupling can be obtained, and the short-side direction of the housing of the second antenna element can be shortened (miniaturized) by the bent structure. Even when the short side is shorter than 使用 of the used wavelength, a radio wave of a desired polarization can be efficiently received.

According to a fourth mobile phone of the present invention, in the second or third mobile phone of the present invention, the conductive member has a spiral shape, a meandering shape, a continuous triangular wave shape, or a continuous square wave shape. It is characterized by being formed in a shape.

The second radiation conductor, that is, the conductive member constituting the second antenna element has a spiral shape.
Since the short side direction of the housing of the second antenna element can be shortened (miniaturized) by adopting a meandering shape or the like, when the operating frequency is low and the short side of the housing is shorter than 1/2 of the operating wavelength. Can efficiently receive radio waves of a desired polarization.

A fifth mobile phone according to the present invention is the third or fourth mobile phone according to the present invention, wherein the bent portion of the conductive member has a spiral shape, a meandering shape, or the like.
It is characterized by being formed in a continuous triangular wave shape or a continuous square wave shape.

The second radiation conductor, that is, the shape of the bent portion of the conductive member constituting the second antenna element is formed into a spiral shape, a meandering shape, or the like, so that the casing of the second antenna element is formed. Since the shorter side direction can be further shortened (smaller), even when the operating frequency is lower and the housing short side is shorter than 使用 of the operating wavelength, a radio wave of a desired polarization can be efficiently received.

In a sixth mobile phone according to the present invention, in the first to fifth mobile phones according to the present invention, when the excited antenna unit is housed, the housing conductor close to the second antenna element is provided in the housing. It is characterized in that the resonance frequency of the second antenna element is changed by being arranged on the body.

Since the second antenna element is arranged close to the housing conductor when the excited antenna unit is stored, the resonance frequency of the second antenna element deviates from the operating frequency. It does not affect the radio wave radiation of the first antenna element operating when the antenna unit is stored.

A seventh mobile phone according to the present invention is the first to fifth mobile phones according to the present invention, wherein the storage conductor for forming a loop shape with the second antenna element when the excited antenna unit is stored. Is arranged in the housing to change the resonance frequency of the second antenna element.

When the excited antenna is housed, the second antenna element and the housing conductor form a loop shape, so that the resonance frequency of the second antenna element is radiated by the first antenna element. The frequency does not greatly deviate from the operating frequency of the radio wave, and does not adversely affect the radio wave radiation from the first antenna element.

An eighth mobile phone according to the present invention is the mobile phone according to any one of the first to seventh mobile phones according to the present invention, wherein a notch is provided at an upper portion of the housing, and the first antenna element is provided with the notch. A position of the second antenna element that is fixedly disposed on the antenna unit and that is close to the first antenna element when the excited antenna unit is pulled out is close to the first antenna element when the excited antenna unit is housed. It is characterized by being arranged not to be.

When the plate-like driven antenna unit is stored, the upper end of the driven antenna unit can be stored at substantially the same height as the upper end of the first antenna element.
Of the antenna element, without apparently protruding from the housing,
It has a very smart housing shape. Further, when the excited antenna unit is housed, the second antenna element is connected to the first antenna element.
Is not arranged in the vicinity of the first antenna element, so that the radiation of the first antenna element is not hindered.

A ninth mobile phone according to the present invention has a microphone and a speaker on the surface of the housing of the mobile phone, has a radio unit in the housing, and communicates with the mobile phone held on the side of the human head. A first antenna element fixedly disposed on the upper part of the housing and connected to the radio unit and having an electrical length of approximately １ ／ wavelength at a used frequency; A mobile phone having a plate-like driven antenna portion slidably disposed on the back surface and having a second antenna element disposed therein,
A third antenna element is provided on the rear surface of the housing, and the third antenna element is disposed close to a tip of the second antenna element when the excited antenna unit is pulled out, so that the second antenna element is disposed. And the sum of the electrical lengths of the third antenna element is approximately 波長 wavelength at the used frequency.

When the excited antenna section is pulled out, the second
Both of the three antenna elements are excited from the first antenna element via a capacitor.

According to a tenth mobile phone of the present invention, in the ninth mobile phone of the present invention, the second antenna element is brought close to a shield in the housing when the excited antenna unit is housed. , The second antenna element is excited.

When the excited antenna unit is stored, the second
Is closer to the shield in the housing, the resonance frequency of the second antenna element is reduced, and only the second antenna element has a wavelength of approximately に お い て at the operating frequency. Can be excited by capacitive coupling with the antenna element.

An eleventh mobile phone according to the present invention is the mobile phone according to any one of the first to tenth mobile phones according to the present invention, wherein an antenna detector for detecting the pull-out or storage operation of the excited antenna unit is provided on the rear surface of the housing. And a detection signal from the antenna detection unit is linked with any one of a mobile phone function using a key arranged on the housing.

The operability of the mobile phone is improved by switching the function of the mobile phone in accordance with a signal from the antenna detecting section for detecting the extraction or storage operation of the excited antenna.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a portable telephone according to the present invention will be described with reference to the drawings. First, FIG.
A first embodiment according to the present invention will be described with reference to FIG. Here, FIG. 1 is a perspective view showing a first embodiment of the mobile phone according to the present invention, and FIG. 2 is a diagram showing an example of use of the mobile phone shown in FIG. 1 in an actual call state.

In FIG. 1, a portable telephone 10 has a housing 1
One surface has a speaker 12, a microphone 13, a key 14, and a liquid crystal display 15;
It has a first antenna portion 16 protruding from the upper surface and fixed, and a plate-like driven antenna portion 17 arranged on the back surface of the housing 11 and slidable toward the upper surface of the housing 11. In FIG. 1, right-handed coordinates in which the upper surface direction of the housing 11 to which the first antenna unit 16 is fixed is the Z axis, and the X axis is the axis perpendicular to the user interface surface on which the liquid crystal display 15 and the keys 14 are arranged Set up a system. The first antenna section 16 internally includes a spiral first antenna element (not shown) having an electrical length of about ４ wavelength at a used frequency, and is provided in a wireless section (not shown) inside the housing 11. It is connected.

A plate-like driven antenna section 17 having a second antenna element (not shown) inside is disposed on the back of the housing 11, and slides in the Z-axis direction on the back of the housing 11 as described above. It can slide in a formula. When the antenna is pulled out, the excited antenna unit 17 is slid upward from the rear surface of the housing 11 and pulled out. On the other hand, when the antenna is housed, the excited antenna unit 17 is moved along the rear surface of the housing 11. The state is stored in the unit storage space 18. At the time of actual real-body communication, as shown in FIG. 2, the body 11 of the mobile phone 10 is tilted about 60 degrees with respect to the vertical direction (that is, about 30 degrees with respect to the horizontal plane), and the human head 22 is tilted.
It is used close to the side surface, and has a structure in which the operation of pulling out or storing the excited antenna unit 17 can be operated with one hand, that is, with the forefinger 21 while talking.
Also, since there is no DC contact between the first antenna element built in the first antenna section 16 and the second antenna element built in the driven antenna section 17, a contact point caused by an operation of pulling out or storing the antenna is provided. No defect occurs.

Further, in the present embodiment, an antenna detecting section (not shown) for detecting the state of the driven antenna section 17 being pulled out or stored is provided in the storage space 18 of the driven antenna section 17, and the receiving signal is received by the detection signal. Excitation antenna section 17
It is also possible to generate a switch signal for changing the mobile phone to the off-hook state when the mobile phone is pulled out, and to change the mobile phone to the on-hook state when storing the mobile phone. By using the switch signal, a one-touch incoming call operation can be performed with one hand, and at the same time, a user can always realize an advantageous state of pulling out the antenna as an antenna characteristic during a call, without being conscious of the user. Further, the present invention is not limited to the case where a switch signal for switching the on-hook / off-hook state of the mobile phone is generated by the detection signal of the antenna detection unit, but also an e-mail function using the key 14 arranged on the surface of the housing 11, a browsing function, and the like. May be used to generate a switching signal for turning on / off any of the functions. Note that the above-described antenna detection unit can be easily realized by using an existing element such as a piezoelectric element or a photoelectric element.

Next, the operation of the mobile phone according to the present invention when the antenna is pulled out or stored will be described with reference to FIG. FIGS. 3A and 3B are schematic diagrams showing the operation of the first embodiment in the above-described mobile phone, and FIGS. 3A and 3B are rear views of the mobile phone when the antenna is pulled out, as viewed from the rear of the housing. Figures and side view thereof,
3C and 3D are a rear view and a side view, respectively, of the mobile phone when the antenna is housed. FIG.
1, the same parts as those in FIG. 1 are denoted by the same reference numerals, and a coordinate system corresponding to the coordinate system in FIG. 1 is also shown.

Referring to FIG. 3, a mobile phone 10 includes a housing 11 formed of resin or the like, a microphone 13 and a speaker 12 disposed on the surface of the housing 11, a radio unit (not shown), and a control circuit (not shown). (Not shown), and a helical conductive member having a first end connected to the radio unit and having an electrical length of about 波長 wavelength at the operating frequency. First antenna element 3
And a second antenna element 34 formed by etching or the like on a dielectric substrate 33 slidable in the Z-axis direction on the rear surface of the housing 11 by etching or the like, and having an electrical length of approximately 波長 wavelength at the operating frequency. And the excited antenna section 17 constituted by The conductive member constituting the second antenna element 34 is substantially in the short side direction of the housing 11 (that is, the Y-axis direction) which is a direction orthogonal to the direction in which the microphone 13 and the speaker 12 are arranged. They are arranged in parallel.

Next, the operation of the portable telephone will be described. First, when the antenna is pulled out, the excited antenna unit 17 is pulled out in the Z-axis direction on the back surface of the housing 11, and one end 34 a of the second antenna element 34 is connected to the tip of the first antenna element 32. And a positional relationship of being arranged close to each other. Therefore, the first antenna element 32 and the second antenna element 34 are coupled via the capacitance, so that not only the first antenna element 32 but also the second antenna element 3
4 also radiates radio waves. Further, the polarization direction of the radiated radio wave is large due to the presence of the second antenna element 34, so that a large amount of polarization component in the Y-axis direction is radiated.
As shown in FIG. 2, when the housing of the mobile phone is inclined by 60 degrees with respect to the vertical direction (30 degrees with respect to the horizontal direction),
Since the angle deviation of the transmission radio wave from the base station with respect to the polarization plane (vertical direction) can be reduced to about 30 degrees, the reception sensitivity of the mobile phone in the actual use state can be improved. Further, the second antenna element 3
4, the second antenna element 34 can be arranged at a position distant from the human body, which is a loss body, at the time of actual communication, and the influence of the human body can be reduced.

On the other hand, when the antenna is housed, the excited antenna section 17 is housed in a slidable manner near the shield 31 on the back of the housing 11, and only the first antenna element 32 operates. In addition, the second inside the excited antenna unit 17
Since the antenna element 34 is arranged very close to the shield 31 in the housing 11, it hardly contributes to radio wave radiation. In the embodiment shown in FIG. 3, when the excited antenna unit 17 is housed, the second antenna element 34 is
The structure is arranged very close to the
May be configured to contact a part of the antenna element 34 with the shield 31.

FIG. 4 is a diagram showing a second embodiment of the excited antenna section 17 of the portable telephone according to the present invention. That is, the excited antenna section 17 of FIG. 4 is in the Y-axis direction of the internal second antenna element 41 (that is, the housing 11).
4 shows an example in which the length of the first antenna element 32 is shortened, i.e., reduced in size. The hatched portion 42 in FIG. 4 indicates the position of the first antenna element 32 when the antenna is pulled out as shown in FIG. .

That is, the excited antenna section 17 shown in FIG.
Has a second antenna element 41 formed on a dielectric substrate 40 slidable in the Z-axis direction by etching or the like and configured in a zigzag pattern in the Y-axis direction. The second antenna element 41 has a continuous U-shape (that is, a square wave shape).
With this zigzag structure, it is possible to physically reduce the size in the short side direction of the housing while maintaining the electrical length at １ ／ wavelength at the operating frequency. In addition, one end 41a of the zigzag pattern having a square wave shape is arranged close to the hatched portion 42 indicating the position of the first antenna element 32 when the antenna is pulled out. Excited by capacitive coupling. The second antenna element 41 of the form shown in the present embodiment can be miniaturized in the short side direction of the housing 11, so that the operating frequency is low, and the short side of the housing 11 of the mobile phone has the operating wavelength. Even in the case of shorter than 1/2, the radio wave of the desired polarization can be transmitted and received efficiently.

FIG. 5 is a diagram showing a third embodiment of the excited antenna section 17 of the portable telephone according to the present invention. That is, the excited antenna section 17 of FIG. 5 is in the Y-axis direction of the internal second antenna element 51 (that is, the housing 11).
5 shows another example in which the length is shortened, i.e., downsized, and the hatched portion 52 in FIG. 5 indicates the position of the first antenna element 32 when the antenna is pulled out as shown in FIG. ing.

5 is formed on a dielectric substrate 50 slidable in the Z-axis direction by etching or the like, and has first and second bent portions 51a and 51a at both ends thereof.
1b. The second antenna element 51 is disposed in a U-shaped pattern having The second antenna element 51 is a U-shaped conductive member, and the total electric length is set to approximately ほ ぼ of the used wavelength. Further, when the antenna is pulled out, the tip of the first bent portion 51a is arranged at a position (hatched portion 52) close to the first antenna element 32, so that the second antenna element 51 is excited by capacitive coupling. You.

According to the form shown in the present embodiment, even when the excited antenna section 17 is drawn out largely to reduce the influence of the human body, the first bent section 51a constituting the second antenna element 51 is formed. And the first antenna element 32 can be brought close to each other, and both can be electrically coupled by capacitance. Further, the electrical length of the U-shaped pattern is set to approximately 1/2 of the wavelength used, but the current distribution of the first and second bent portions 51a and 51b at both ends is small. And does not contribute much to radiation, so the second antenna element 5
1 by the element portion arranged in the Y-axis direction.
Radio waves having axial polarization components can be transmitted and received efficiently. Preferably, if the lengths of the first and second bent portions 51a and 51b are the same, the currents on the first and second bent portions 51a and 51b cancel each other, and the first and second bent portions 51a and 51b cancel each other. 2 bent parts 51a and 51b
Radio radiation from the vehicle can be eliminated.

FIG. 6 is a diagram showing a fourth embodiment of the excited antenna section 17 of the portable telephone according to the present invention. That is, the driven antenna section 17 of FIG. 6 is further miniaturized by forming the first and second bent portions 51a and 51b shown in FIG. 5 into a continuous square wave zigzag pattern. Things. In the same manner as described above, the total electrical length of the first and second continuous zigzag patterns 61a and 61b and the coupling pattern 61c connecting them is set to approximately 1/2 wavelength at the operating frequency. . According to the present embodiment, further miniaturization of excited antenna unit 17 is realized.

In the embodiment shown in FIG. 5 or FIG. 6, both ends of the conductive member constituting the second antenna element are bent, and the first bent portion 51a and the second bent portion are formed. , Or a shape having the first zigzag pattern 61a and the second zigzag pattern 61b. However, the present invention is not limited thereto, and the first bent portion 51a close to the first antenna element 32 is formed. Alternatively, only the first zigzag pattern 61a, that is, only one end may be bent. Further, in the embodiment shown in FIG. 6, the zigzag pattern in which the bent portions (bend portions) are continuous has a square wave shape. However, the present invention is not limited to this, and may be formed in a spiral shape. Alternatively, a zigzag pattern having a continuous triangular wave shape may be used. In the embodiment shown in FIG.
Although only the bent portion of the conductive member constituting the second antenna element has a continuous square wave zigzag pattern, the present invention is not limited to this, and the entire shape of the second antenna element may be spiral, meandering, or continuous. It may be formed in a zigzag pattern having a triangular wave shape or a continuous square wave shape.

Next, FIG. 7 is a schematic view showing the operation of the second embodiment in the portable telephone according to the present invention. Here, FIGS. 7A and 7B are a rear view and a side view of the antenna portion of the mobile phone when the antenna is pulled out, as viewed from the back of the housing, respectively.
And FIG. 7D is a rear view and a side view of the antenna unit of the mobile phone when the antenna is housed. In FIG. 7, the same parts as those in FIG.
Further, a coordinate system corresponding to the coordinate system of FIG. 1 is also shown.

The portable telephone shown in FIG. 7 is a modification of the arrangement of the first antenna element shown in the first embodiment, in which a notch is provided on the upper surface of the casing of the portable telephone. The protrusion of the first antenna element is reduced by attaching the first antenna element to the portion. That is, the mobile phone of the present embodiment has a notch 71 in the upper part of the housing 11 in which a wireless unit (not shown) and the like are provided.
a, and a shield 71 in which the wireless unit and the like are provided in the housing 11 in a shape corresponding to the shape of the cutout portion 71a.
Further, the first antenna element 7 is fixedly disposed in the cutout portion 71a, is connected to the radio section in the housing 11, and has an electrical length of approximately 1/4 wavelength at the operating frequency.
2, a plate-like excited antenna portion 17 disposed on the back of the housing 11, and a space 1 for accommodating the excited antenna portion 17
8, a rectangular storage conductor 7 fixed to the rear surface of the housing 11 and arranged in the Y-axis direction (the short side direction of the housing 11).
And 3. The excited antenna section 17 is a dielectric substrate 74
Second antenna element 75 formed thereon by etching or the like
Having. The second antenna element 75 includes U-shaped second, third, and fourth conductive patterns 75b, 75b.
c and 75d and a first conductor pattern 75a connected to the tip of the second pattern 75b, and the total electrical length is set to approximately 1/2 wavelength at the operating frequency.

When the excited antenna section 17 is pulled out, the first conductor pattern 75a constituting the second antenna element 75 is arranged close to the tip of the first antenna element 72, and the first antenna element 72 By capacitive coupling, the first, second,
Third and fourth conductor patterns 75a, 75b, 75c
And the second antenna element 75 constituted by 75d. On the other hand, when the excited antenna unit 17 is housed, the first and second conductor patterns 75a and 75b constituting the second antenna element 75 are arranged at positions not close to the first antenna element 72, and The storage conductor 73 is disposed so as to cross both the second conductor pattern 75b and the fourth conductor pattern 75d.

According to the present embodiment, when the excited antenna unit 17 is pulled out, the first antenna element 72 and the first, second, third and fourth conductor patterns 75a, 75
b, 75c, and 75d are capacitively coupled to the second antenna element 75 to form a desired polarization plane (Y
A polarized wave close to the axial direction (that is, the short side direction of the housing) can be obtained. On the other hand, when the excited antenna unit 17 is stored, the first and second conductor patterns 75a and 75b
Since the antenna element 72 is not located close to the first antenna element 72, it does not hinder the emission of radio waves from the first antenna element 72. Also, since the storage conductor 73 is arranged to cross the second and fourth conductor patterns 75b and 75d, the second, third and fourth conductor patterns 75b and 75d are arranged.
The b, 75c and 75d and the storage conductor 73 form a loop shape via the dielectric substrate 74. Therefore, when the excited antenna unit 17 is housed, the resonance frequency of the second antenna element 75 can be largely shifted from the operating frequency of the radio wave radiated by the first antenna element 72. There is no adverse effect on the radiation of radio waves.

In the embodiment shown in the present embodiment, the housing conductor 73 is provided with the second and fourth conductor patterns 75b and 75d when the excited antenna unit 17 is housed.
, But is not limited to this. That is, when the excited antenna unit 17 is housed, the housing conductor 73 approaches one of the first, second, third and fourth conductor patterns 75a, 75b, 75c and 75d, and What is necessary is just to arrange | position so that the resonance frequency of the 2nd antenna element 75 formed of the 3rd and 4th conductor patterns 75a, 75b, 75c, and 75d can be changed.

Next, FIG. 8 is a schematic view showing the operation of the third embodiment in the portable telephone according to the present invention. FIGS. 8A and 8B are a rear view and a side view of the antenna portion of the mobile phone when the antenna is pulled out, as viewed from the back of the housing, respectively.
FIG. 8D is a rear view and a side view of the antenna portion of the mobile phone when the antenna is stored. In FIG. 8, the same parts as those in FIG.
Further, a coordinate system corresponding to the coordinate system of FIG. 1 is also shown.

The portable telephone shown in FIG.
This is an improvement in the characteristics of the mobile phone shown in the embodiment when the antenna is housed. The mobile phone shown in FIG. 8 has a shield 81 which is provided in a housing 11 and includes a radio unit and the like.
And a first antenna element 82 having an electrical length of approximately 波長 wavelength at the operating frequency, and a first antenna element 82 disposed at the upper end of the housing 11 and being formed on the dielectric substrate 83 by etching or the like, Connected first, second, third and fourth conductor patterns 84a, 84b, 84c and 84d
And a plate-like excited antenna section 17 on which a second antenna element 84 composed of the four conductor patterns is disposed, and furthermore, a housing close to a space 18 for accommodating the excited antenna section 17. An extension conductor 85 is provided on the back surface portion 11 and fixed to a position close to the fourth conductor pattern when the excited antenna unit 17 is housed, and operates as a third antenna element. First, second, third and fourth conductor patterns 84a, 84 constituting second antenna element 84
The arrangement of b, 84c and 84d is the same as that shown in FIG. 7, but the total electrical length is set to be shorter than a half wavelength at the used frequency.

First, at the time of pulling out the antenna, the driven antenna section 17 is pulled out from the rear surface of the housing 11 in a slidable manner as in the above-described embodiments, and the first antenna element 84 constituting the second antenna element 84 is formed. Of the first conductor pattern 84a
And is coupled via an electrostatic capacitance. Further, the tip of the fourth conductor pattern 84d constituting the second antenna element is placed in close proximity to the extension conductor 85 fixedly arranged in the housing, so that the tip is in an electrically coupled state. The electrical length of the conductor pattern is extended. The total electrical length of the first, second, third, and fourth conductor patterns 84a, 84b, 84c, and 84d and the extension conductor 85 serving as the third antenna element is approximately 1/2 wavelength at the operating frequency. , And operates as an excited antenna element.

Next, when the antenna is housed, the excited antenna unit 17 is slidably housed on the rear surface of the housing 11 to a height substantially equal to the upper end of the first antenna element 82.
At this time, since the fourth conductor pattern 84d constituting the second antenna element 84 and the extension conductor 85 are housed so as to substantially overlap each other, the second antenna element 84 operating as the excited antenna element is It is composed of the second, third and fourth conductor patterns 84a, 84b, 84c and 84d, and the total electrical length is shorter than when the antenna is pulled out. However, when the antenna is housed, the first, second, third, and fourth conductor patterns 84a, 84a
Since b, 84c and 84d are in the state of being close to the shield 81, the resonance frequency thereof is reduced, and the electrical length is equivalently extended to approximately 波長 wavelength at the operating frequency. And is excited by capacitive coupling with the antenna element 82.

According to this embodiment, even when the antenna is housed, the first, second, third and fourth conductor patterns 84
Since the second antenna element 84 formed of a, 84b, 84c and 84d and the first antenna element 82 operate by capacitive coupling, radio waves are radiated more efficiently than the first antenna element alone, Since the upper portion of the excited antenna unit 17 is housed at substantially the same height as the upper end of the first antenna element 82, the first antenna element 82 does not seem to protrude from the housing 11 and is very smart. It can be shaped.

In the present embodiment, the extension conductor 85 and the fourth conductor pattern 84 d forming the second antenna element 84 are electrically coupled via the dielectric substrate 83. The present invention is not limited to this, and both may make DC contact.

Further, in each of the above-described embodiments, all the excited antenna portions are formed on the dielectric substrate.
Instead of the dielectric substrate, a flexible substrate or a sheet metal may be used. In each of the above-described embodiments, the shape of the first antenna element is a spiral shape.
It may be constituted by a meandering pattern or the like formed on the dielectric substrate.

[0057]

The portable telephone according to the present invention has a first antenna element fixedly disposed on the housing of the portable telephone and a driven antenna slidably slidable. By arranging the second antenna element installed in the antenna section in a direction substantially perpendicular to the direction in which the microphone and the speaker are arranged, the excited antenna section is pulled out of the housing in a sliding manner so that radio waves generated by the human body can be obtained. While preventing deterioration such as shielding or attenuation of the mobile phone, the relative angle between the plane of polarization of the transmission radio wave between the base station and the mobile phone and the plane of polarization of the receiving antenna system can be reduced, and more efficient reception is possible. Become. Also, during a real-body call, good reception is possible even when held by either the left or right hand.

Further, since the excited antenna section can be formed in a non-contact state with other electric elements in the portable telephone,
Even when the driven antenna section is slid, there is no problem such as poor contact and the like, and it is excellent in terms of waterproof measures.

Further, since the retractable antenna unit can be pulled out and stored on the rear surface of the housing in a sliding manner, if the receiving sensitivity is poor during a call, the user can hold the housing with one hand while holding the housing. The driven antenna unit can be pulled out with one touch.

Further, since the second antenna element has a bent portion at both ends or one end, or is formed in a spiral shape, meandering shape, or the like, the operating frequency is low and the housing is short. Even when the side is shorter than 1/2 of the used wavelength, a desired radio wave can be efficiently received.

Further, by arranging a housing conductor that is close to the second antenna element or forms a loop shape when the antenna is housed in the housing, it does not affect the radio wave emission of the first antenna element.

Further, the electric length is 1 / the value of the operating frequency.
By bringing the second antenna element shorter than two wavelengths close to the shield in the housing when the antenna is housed, the resonance frequency is reduced, and the electrical length is reduced to 1 /
It is possible to excite the first antenna element by extending it equivalently to two wavelengths, and to improve the characteristics when the antenna is housed.

Further, by providing a cutout portion in the housing in which the first antenna portion is provided, the upper end of the driven antenna portion is substantially the same as the upper end of the first antenna portion when the driven antenna portion is stored. Since the first antenna unit can be stored at the height, the first antenna unit apparently does not protrude from the housing and has a smart housing shape.

Further, the function of the mobile phone can be switched by the detection signal from the antenna detecting section for detecting the retracting operation of the excited antenna section, and the operability of the mobile phone is improved. Preferably, by switching the on-hook and off-hook of the mobile phone by the detection signal, a one-touch incoming call can be realized, and at the time of a call, an antenna withdrawal state that is advantageous as an antenna characteristic can always be realized without being conscious of the user.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a mobile phone according to the present invention.

FIG. 2 is a diagram showing an example of use of the mobile phone according to the present invention in an actual call state;

FIG. 3 is a schematic diagram showing an operation of the mobile phone according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a form of a second example of the excited antenna unit in the mobile phone according to the first embodiment of the present invention;

FIG. 5 is a diagram showing a form of a third example of the excited antenna unit in the mobile phone according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a form of a fourth example of the excited antenna unit in the mobile phone according to the first embodiment of the present invention;

FIG. 7 is a schematic diagram showing an operation of the mobile phone according to the second embodiment of the present invention.

FIG. 8 is a schematic diagram showing an operation of the mobile phone according to the third embodiment of the present invention.

FIG. 9 is a perspective view showing an example of a conventional mobile phone.

FIG. 10 is a diagram illustrating an example of use of a conventional mobile phone in an actual call state.

[Explanation of symbols]

10, 90: mobile phone, 11, 91: housing, 12, 9
2: Speaker, 13, 93: Microphone, 14, 94
... Key, 15, 95 ... Liquid crystal display, 16 ... First antenna unit, 17 ... Excited antenna unit, 18 ... Excited antenna unit storage space, 21 ... Index finger, 22, 100
... human head, 31, 71, 81 ... shield, 32, 7
2, 82... First antenna element, 33, 40, 50, 6
0, 74, 83 ... dielectric substrate, 34, 41, 51, 7
5, 84 ... second antenna element, 42, 52, 62 ... position of first antenna element, 51 a ... first bent part, 51
b: second bent portion, 61a: first zigzag pattern,
61b: second zigzag pattern, 61c: coupling pattern, 73: storage conductor, 85: extension conductor, 97: first antenna, 98: second antenna, 99: antenna.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 1/08 H04B 1/08 Z H04Q 7/32 7/26 VF term (Reference) 5J021 AA02 AA13 AB02 AB06 CA06 DB04 GA02 GA08 HA05 HA10 5J046 AA01 AA04 AB12 AB13 PA06 PA07 TA01 TA03 5J047 AA01 AA04 AB12 AB13 BF09 5K016 AA04 AA07 AA13 BA06 CA01 CA09 DA01 DA06 EA07 5K067 AA23 AA33 AA34 BB04 CC24 KK03 KK03

Claims (11)

[Claims] 1. A microphone on a surface of a housing of a mobile phone.
A mobile phone having a speaker and having a wireless unit in the housing and communicating while being held on the side of the human head, fixedly arranged on the upper part of the housing and connected to the wireless unit A first antenna element having an electrical length of about 1/4 wavelength at a used frequency, and a plate-like element which is slidably disposed on the back surface of the housing and in which the second antenna element is disposed. Wherein the second antenna element is excited by capacitive coupling with the first antenna element when the excited antenna section is pulled out. . 2. The mobile phone according to claim 1, wherein
The second antenna element is arranged in a direction substantially orthogonal to the direction in which the microphone and the speaker are arranged, and is formed of a conductive member having an electrical length of approximately 波長 wavelength at a used frequency. A mobile phone characterized by the following. 3. The mobile phone according to claim 2, wherein
A mobile phone, wherein a bent portion is provided at both ends or one end of the conductive member. 4. The mobile phone according to claim 2, wherein the conductive member has a spiral shape, a meandering shape,
A mobile phone formed in a continuous triangular wave shape or a continuous square wave shape. 5. The portable telephone according to claim 3, wherein the bent portion of the conductive member is formed in a spiral shape, a meandering shape, a continuous triangular wave shape, or a continuous square wave shape. Mobile phone. 6. The mobile phone according to claim 1, wherein a housing conductor close to the second antenna element is arranged in the housing when the excited antenna unit is housed. A mobile phone, wherein a resonance frequency of the second antenna element is changed. 7. The mobile phone according to claim 1, wherein a housing conductor for forming a loop shape with the second antenna element when the driven antenna unit is housed is arranged in the housing. Thereby changing the resonance frequency of the second antenna element. 8. The mobile phone according to claim 1, further comprising: a notch provided in an upper part of the housing, wherein the first antenna element is fixedly disposed in the notch. In addition, it is preferable that the position of the second antenna element approaching the first antenna element when the excited antenna unit is pulled out is arranged so as not to approach the first antenna element when the excited antenna unit is housed. Mobile phone characterized by the following. 9. A microphone on the surface of the housing of the mobile phone,
A mobile phone having a speaker and having a wireless unit in the housing and communicating while being held on the side of the human head, fixedly arranged on the upper part of the housing and connected to the wireless unit A first antenna element having an electrical length of about 1/4 wavelength at a used frequency, and a plate-like element which is slidably disposed on the back surface of the housing and in which the second antenna element is disposed. And a third antenna element on the rear surface of the housing, wherein the third antenna element is the same as the second antenna element when the excited antenna section is pulled out. By being arranged close to the tip, the sum of the electrical lengths of the second and third antenna elements can be reduced to approximately に お い て at the operating frequency.
A mobile phone characterized by a wavelength. 10. The portable telephone according to claim 9, wherein said second antenna element is excited by bringing said second antenna element close to a shield in said housing when said excited antenna unit is housed. A mobile phone characterized by the following. 11. The mobile phone according to claim 1, further comprising: an antenna detecting unit for detecting a pull-out or a retracting operation of the excited antenna unit on a rear surface of the housing. A mobile phone function in which the detection signal is linked with one of mobile phone functions using a key arranged on the housing.