JP2006148669A - Sliding type portable telephone set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding type portable telephone set in which sufficient and stable call quality can be obtained by improving radiation power efficiency through opening/closing the sliding type portable telephone set. <P>SOLUTION: In a sliding type portable telephone set 1 wherein a lower case 2 and an upper case 3 are linked so as to slide, a built-in antenna 12 for performing transmission/reception is provided in the lower case 2, and a non-exciting element 16 of which one side is grounded on an upper ground plate 15 that functions as a ground, is provided on the upper case 3. At a position where the non-exciting element 16 and the built-in antenna 12 face each other and are made proximate to each other, the non-exciting element 16 is resonated with the built-in antenna 12, thereby improving radiation power efficiency. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a slide mobile phone device used for mobile radio communication, for example, and more particularly to a slide mobile phone device related to optimization of radiation power efficiency of a built-in antenna.

  In mobile phone devices that change the length of the case when opening and closing, such as sliding and folding mobile phone devices, the current distribution on the ground plane built into the mobile phone device changes when the mobile phone device opens and closes. Therefore, the impedance characteristic changes, and the radiated power efficiency of the built-in antenna provided in the mobile phone device changes. For example, when an antenna matching circuit is provided in a slide-type or foldable-type mobile phone device so as to obtain optimum radiated power efficiency when the mobile phone device is opened, the current on the ground plane when the mobile phone device is closed The impedance characteristic changes due to the change in distribution, and the radiated power efficiency of the built-in antenna when the cellular phone device is closed deteriorates.

As an example, FIG. 12 shows a return loss characteristic with respect to frequency when a slide of a conventional sliding mobile phone device is opened and closed. This return loss characteristic is a log scale (return loss = 20 log ₁₀ (reflected electric field strength / incident electric field strength)) display (dB display) of the ratio of the reflected electric field strength to the incident electric field strength measured at the connection portion between the built-in antenna and the antenna matching circuit. This indicates that the radiated power efficiency is improved because the reflected electric field intensity decreases as the value becomes negative.

  In the return loss characteristic of FIG. 12, reference numeral 40 denotes a return loss characteristic when the slide is opened, and reference numeral 41 denotes a return loss characteristic when the slide is closed. In the frequency band shown on the horizontal axis, a transmission range of 1.94 to 1.96 GHz indicates a frequency range used for transmission, and a reception range of 2.13 to 2.15 GHz indicates a frequency range used for reception. . The return loss characteristic shown on the vertical axis shows a practical range as a practical range where transmission and reception are possible. For example, in FIG. 12, the upper limit for practical transmission / reception is −7.5 dB, and if the return loss characteristic value is on the negative value side from −7.5 dB, it can be said that it is in the practical range. Therefore, in order to obtain a good transmission / reception state, the values of the return loss characteristics in the transmission range 1.94 to 1.96 GHz and the reception range 2.13 to 2.15 GHz must both be within this practical range. However, when the slide is closed, the return loss characteristic deviates from the practical range in the reception range (2.13 to 2.15 GHz) as shown by the return loss characteristic 41 in the closed state, and the radiated power efficiency. Deteriorates and a good reception state cannot be obtained. Note that the return loss characteristic value of −7.5 dB shown here is an example, and is not a fixed value, but is set according to the use environment such as a transmission / reception frequency.

  In order to cope with such a problem, in a conventional foldable mobile phone device having an open / close function similar to a slide type mobile phone device, an open / close detection circuit for detecting when the foldable mobile phone device is opened and closed, and a foldable type An antenna matching circuit and an antenna characteristic switching circuit are individually provided so that optimum radiated power efficiency can be obtained when the cellular phone device is opened and closed, and the cellular phone device is switched according to the opening and closing of the folding cellular phone device. (For example, see Patent Document 1)

  Another foldable mobile phone device is intended to control the directivity of the radiated power of the built-in antenna when the foldable mobile phone device is opened and closed, and constitutes a foldable mobile phone device. In order to control the directivity of the radiated power of the built-in antenna when the foldable mobile phone device is folded, the built-in antenna is disposed in the other housing. A conductor portion having a length shorter than ½ wavelength and not connected to a conductor such as a ground plane is provided. (For example, see Patent Document 2)

JP 2001-339474 A (pages 4-6, FIG. 1) Japanese Unexamined Patent Publication No. 2003-37415 (4th, 5th page, FIG. 1)

  Since the conventional foldable mobile phone device described in Patent Document 1 is configured as described above, the foldable mobile phone device includes an open / close detection circuit, an antenna matching circuit corresponding to opening and closing, and antenna characteristic switching. Since two matching circuits of the circuit and a control unit that switches between the antenna matching circuit and the antenna characteristic switching circuit are required, there is a problem that the electronic circuit and the high-frequency circuit become complicated and large.

  In addition, since the conventional folding cellular phone device described in Patent Document 2 is configured as described above, the directivity of the radiated power of the built-in antenna is controlled and improved. Since the length of the conductor portion is short, resonance is not obtained, and there is a problem that the radiated power efficiency is not improved.

  The present invention has been made in order to solve the above-described problems, and realizes an improvement in radiated power efficiency through opening and closing of the slide type mobile phone device, and has a sufficient and stable communication quality. Is to provide.

  A slide type mobile phone device according to the present invention is a slide type mobile phone device in which a first case and a second case are slidably connected, and the first case has a built-in antenna for transmitting and receiving. The second housing includes a ground member serving as a ground, and a non-excitation element that resonates with the built-in antenna at a position where one of the ground members is grounded to the ground member and faces and close to the built-in antenna.

  According to the present invention, since the improvement of the radiated power efficiency is realized by using a small non-excitable element that can be mounted during opening and closing of the slide type mobile phone device, the slide type mobile phone having sufficient and stable communication quality. There is an effect that a device can be provided.

Embodiment 1
1 to 4 show a slide-type mobile phone device according to the first embodiment. FIG. 1 is an external view of a slide type mobile phone device. 2 and 3 are configuration diagrams showing the main configuration of the slide type mobile phone device. FIG. 2 shows a state where the slide is opened, and FIG. 3 shows a state where the slide is closed. FIG. 4 shows, as an example of the first embodiment, the return loss characteristic with respect to the frequency in the case of the presence or absence of a non-excitation element in the GHz band frequency when the slide is closed.

  In FIG. 1, a slide type mobile phone device 1 includes a lower housing 2 that is a first housing and an upper housing 3 that is a second housing. The lower housing 2 and the upper housing 3 are slidably connected by a slide mechanism (not shown), so that the sliding mobile phone device 1 can freely open and close the slide without being separated. It is possible. The lower housing 2 is provided with an operation unit 4 composed of various key switches and a transmission unit 5. The upper housing 3 has a display unit 6 for displaying characters, image information, and the like, and a transmission unit. 5 and a receiver 7 are provided.

  2 and 3, a base plate 10 having a size of about 90 × 45 mm is provided in the lower housing 2, and the operation unit 4 is formed on the base plate 10. An electronic circuit (not shown) on which various key switches and a microphone constituting the transmission section 5 are mounted, a wireless circuit section 11 having a wireless circuit, and the built-in antenna 12 in the state where the slide is opened. A matching circuit unit 13 that is impedance matched so as to have efficiency is provided. Power is supplied to the built-in antenna 12 from the wireless circuit unit 11 via the matching circuit unit 13. The built-in antenna 12 is made of, for example, a linear or plate-like metal conductor using copper or the like, and is formed as a monopole antenna having a length of about ¼ of the wavelength of the transmitted / received frequency. Further, since the built-in antenna 12 is built in the lower housing 2, it extends in the −X direction from the matching circuit portion 13, and then comes into contact with or in the vicinity of the inner surface of the lower housing 2 at an angle of about 90 degrees in the −Y direction. Is bent. The bent shape of the built-in antenna 12 shown here is shown as an example, and any shape that has the function of an antenna and can be built into the lower housing 2 may be used. Normally, in the slide-type mobile phone device 1, the built-in antenna 12 has a radiation power efficiency when the periphery of the built-in antenna 12 is covered with a hand during a call or mail, or when the built-in antenna 12 and the head are close to each other. In order to prevent the deterioration, the lower casing 2 is disposed at the end portion in the −X direction.

  Further, an upper base plate 15 that is a grounding member and has a size of about 90 × 45 mm is provided in the upper casing 3. On the upper base plate 15, a microphone constituting the transmitter 5 and the receiver 7 are provided. An electronic circuit (not shown) on which a speaker and a display unit 6 are mounted is provided. As shown in FIG. 3, the upper base plate 15 has a non-excited element 16 grounded to the upper base plate 15 in a position facing and close to the built-in antenna 12 when the slide is closed. After extending from the ground plane 15 in the −Z direction where the built-in antenna 12 is located, it is in contact with the inner surface of the upper housing 3 or is bent at an angle of about 90 degrees in the Y direction at a position in the vicinity. The non-excitation element 16 is a linear or plate-like metal conductor using, for example, copper or the like, and has the same frequency as that of the internal antenna 12 to be transmitted and received so as to easily resonate upon receiving the power radiation of the internal antenna 12. The length is approximately 1/4 of the wavelength. The upper base plate 15 is connected to the base plate 10 by a flexible cable (not shown).

In FIG. 4, the horizontal axis indicates the frequency in the GHz band, and the vertical axis indicates the return loss characteristic at the connection portion between the built-in antenna 12 and the matching circuit portion 13. This return loss characteristic is a log scale (return loss = 20 log ₁₀ (reflected electric field strength / incident electric field strength)) display (dB display) of the ratio of the reflected electric field strength to the incident electric field strength measured at the connection portion between the built-in antenna and the antenna matching circuit. This indicates that the radiated power efficiency is improved because the reflected electric field intensity decreases as the value becomes negative. In the return loss characteristic of FIG. 4, 20 indicates the return loss characteristic when the non-excitation element 16 is not provided, and 21 indicates the return loss characteristic when the non-excitation element 16 is provided. In the frequency shown on the horizontal axis, a transmission range of 1.94 to 1.96 GHz indicates a frequency range used for transmission, and a reception range of 2.13 to 2.15 GHz indicates a frequency range used for reception. The return loss characteristic shown on the vertical axis shows a practical range as a practical range where transmission and reception are possible. For example, in FIG. 4, the upper limit for practical transmission / reception is −7.5 dB, and if the return loss characteristic value is on the negative value side of −7.5 dB, it can be said that it is in the practical range. Therefore, in order to obtain a good transmission / reception state, the values of the return loss characteristics in the transmission range 1.94 to 1.96 GHz and the reception range 2.13 to 2.15 GHz must both be within this practical range. . The return loss characteristic value −7.5 dB shown here is shown as an example, and is not a fixed value, but is set according to the use environment such as transmission / reception frequency. Further, the return loss characteristic 20 when the non-excitation element 16 shown in FIG. 4 is not provided and the return loss characteristic 41 when the slide shown in FIG. 12 is closed are the same.

  Next, the operation of the sliding mobile phone device 1 according to the first embodiment of the present invention will be described with reference to FIGS.

  First, the operation of the sliding cellular phone device 1 in the state where the slide is opened will be described with reference to FIGS.

  In the state in which the slide of the sliding mobile phone device 1 is opened, the built-in antenna 12 and the non-exciting element 16 are separated from each other, and therefore the built-in antenna 12 and the non-exciting element 16 are not electromagnetically coupled. In addition, the matching circuit 13 is impedance-matched so that the radiation power efficiency of the built-in antenna 12 is optimal when the slide is opened. In this case, the return loss characteristic 40 in the state in which the slide of FIG. 12 shown in the prior art is opened is obtained, and the transmission range (1.94 to 1.96 GHz) and the reception range (2.13 to 2.15 GHz) are obtained. ), Both are in the practical range and have good radiation power efficiency. Therefore, a good transmission / reception state can be obtained.

  Next, the operation of the sliding cellular phone device 1 in the state where the slide is closed will be described with reference to FIGS.

  In a state where the slide of the sliding mobile phone device 1 is closed, the current distribution flowing through the base plate 10 and the upper base plate 15 changes as the relative position of the base plate 10 and the upper base plate 15 changes. The characteristics also change. Since the matching circuit 13 performs impedance matching in a state where the slide is opened, the matching circuit 13 cannot follow a change in impedance characteristics when the slide is closed. Therefore, the radiation power efficiency of the built-in antenna 12 is deteriorated.

  At this time, if the non-exciting element 16 is not provided as in the prior art, as shown in the return loss characteristic 20 when the non-exciting element 16 is not shown in FIG. .15 GHz), the return loss characteristic is out of the practical range and the radiated power efficiency is deteriorated, so that a good reception state cannot be obtained.

  On the other hand, in the case where the non-exciting element 16 is provided, the non-exciting element 16 and the built-in antenna 12 are electromagnetically coupled because they are located opposite to each other. The non-excitation element 16 electromagnetically coupled to the built-in antenna 12 is grounded to the upper base plate 15, so that the apparent length of the non-excitation element 16 includes the size of the upper base plate 15. Since it has a length that resonates with the antenna 12 and the non-excited element 16 resonates with the built-in antenna 12, the radiation power efficiency of the built-in antenna 12 is improved. The effect of this improvement is that the return loss characteristic is practical from outside the practical range as shown in the return loss characteristic 21 in the case of having the non-excited element 16 in the reception range (2.13 to 2.15 GHz) in FIG. Indicated by being in range. Therefore, by providing the non-excitation element 16, a good transmission / reception state can be obtained even when the slide is closed.

  Table 1 shows the radiated power efficiency of the built-in antenna 12 according to the presence or absence of the non-excitation element 16 when the slide is closed. This radiated power efficiency is obtained by dividing the power radiated from the built-in antenna 12 by the power input to the built-in antenna 12 and displaying it on a log scale (dB display). 0 dB indicates the best state, and a negative value indicates It shows that the radiated power efficiency deteriorates as the value increases. From Table 1, the radiated power efficiency is 2.4 dB (= −1.5 dB) as a difference between the worst value −3.9 dB without the non-excitation element 16 and the worst value −1.5 dB with the non-excitation element 16. -(-3.9)) It shows improvement.

  It is desirable that the distance between the non-excited element 16 and the built-in antenna 12 that are electromagnetically coupled is about 1 to 4 mm.

  According to the first embodiment, in the sliding cellular phone device 1 in which the lower housing 2 and the upper housing 3 are slidably connected, the lower housing 2 includes the built-in antenna 12 for transmitting and receiving, Since the upper housing 3 includes the upper base plate 15 and a non-excitation element 16 that resonates with the internal antenna 12 at a position where one of the upper base plate 15 is grounded to the upper base plate 15 and faces and close to the internal antenna 12, the sliding mobile phone device Since the improvement of the radiated power efficiency can be realized by using the mountable small non-excitation element 16 during the opening and closing of the mobile phone, there is an effect that it is possible to provide a sliding mobile phone device having sufficient and stable communication quality.

Embodiment 2
In the first embodiment, the configuration in which the built-in antenna 12 and the non-exciting element 16 are located opposite to each other in the closed state of the slide type mobile phone device 1 is shown, but FIG. 5 and FIG. As shown in FIG. 6, the built-in antenna 12 and the non-excitation element 16 may be configured to face each other and close to each other when the slide of the sliding mobile phone device 1 is opened, which is equivalent to the first embodiment. The effect of. However, in this case, the matching circuit unit 13 needs to perform impedance matching in a state where the slide is closed.

  According to the first and second embodiments, the length of the non-excitation element 16 is shown as being about ¼ of the wavelength of the transmitted / received frequency, but the length is 3/4 or ½ of the wavelength. Even in this case, the same effect can be obtained.

Embodiment 3
A slide type mobile phone device according to Embodiment 3 of the present invention will be described with reference to FIG.

  FIG. 7 is a configuration diagram showing the main configuration of the sliding mobile phone device 1 according to Embodiment 3 of the present invention, and shows a state in which the slide is closed. Among the symbols used in FIG. 7, the same symbols as those used in Embodiment 1 indicate the same or equivalent products.

  In FIG. 7, the configuration is different from that of the first embodiment in that a non-excited element 16 is converted to an electrical length at which the non-excited element 16 resonates corresponding to a predetermined frequency to be transmitted and received. That is, the ground plate 15 is grounded via the reactance element 24.

  As an operation according to the third embodiment, the difference from the first embodiment is that a coil is used as the reactance element 24, so that the current acts to delay the phase with respect to the voltage, the electrical length is shortened, and the reactance is reduced. The length of the non-excited element 16 can be obtained by using the predetermined reactance element 24 by utilizing the fact that the electric length is increased by using the capacitor as the element 24 so that the current advances the phase with respect to the voltage. The non-excited element 16 is converted to an electrical length that resonates with the built-in antenna 12 without changing the above. Therefore, by using the reactance element 24, it is possible to cope with many frequencies without changing the length of the non-excitation element 16.

  In the third embodiment, the non-excitation element 16 is grounded to the upper base plate 15 via a reactance element 24 that converts the non-excitation element 16 into an electrical length that resonates according to a predetermined frequency transmitted and received. Since the length of the non-excitation element 16 can be converted to an electrical length that resonates with the built-in antenna 12 without changing the length, the same effect as in the first embodiment can be obtained, and depending on a predetermined frequency By providing the reactance element 24, there is an effect that the slide type mobile phone device 1 that can deal with many frequencies can be obtained.

  Further, according to the third embodiment, the length of the non-excitation element 16 is set to about 1/4 of the wavelength of the frequency to be transmitted / received, but the predetermined reactance element 24 incorporates the electrical length of the non-excitation element 16. Since it is converted so as to resonate with the antenna 12, it is not necessary to limit the length of the non-excitation element 16 in particular.

  In addition, according to Embodiment 1 to 3, although the thing using the upper ground board 15 was shown as a grounding member, for example, when the upper housing | casing 3 is formed with an electroconductive material, as a grounding member, The upper casing 3 may be selected, and the non-excitation element 16 may be grounded to the upper casing 3.

Embodiment 4
Next, a sliding mobile phone device according to Embodiment 4 of the present invention will be described with reference to FIGS.

  8 and 9 are configuration diagrams showing the main configuration of the sliding mobile phone device 1 according to the fourth embodiment of the present invention. FIG. 8 shows a state in which the slide is opened, and FIG. Shows the state. Of the reference numerals used in FIGS. 8 and 9, the same reference numerals used in the first embodiment indicate the same or equivalent parts.

  8 and 9, the configuration differs from the first embodiment in that one of the lower casing 2 is grounded to the base plate 10, and the other extends in the Z direction with the upper casing 3. The connection member 25 exposed on the outer surface of the connection member 25 is provided, and the upper casing 3 is provided with a non-excitation element 26, one of which is electrically connected to the exposed portion of the connection member 25 at a position facing and close to the built-in antenna 12. The upper housing 3 is provided on the outer surface in the −Z direction. Here, the addition of the connection member 25 to the non-excitation element 26 corresponds to the non-excitation element 16 shown in the first embodiment. Further, the connection member 25 and the non-excitation element 26 are made of the same material as in the first embodiment. 8 and 9, the non-excitation element 26 is connected to the connection member 25 in a state where the slide is closed, and is configured to be in a position facing and close to the built-in antenna 12. In addition, the matching circuit unit 13 is impedance-matched so that the built-in antenna 12 has optimum radiated power efficiency when the slide is opened.

  As an operation according to the fourth embodiment, the difference from the first embodiment is that the non-excitation element 26 is grounded to the base plate 10 via the connecting member 25 only when the slide is closed, and is opposed to the non-excitation element 26. It is to be electromagnetically coupled to the built-in antenna 12 at a close position. The operation when the non-exciting element 26 and the built-in antenna 12 are electromagnetically coupled is the same as that of the first embodiment except that the non-exciting element 26 is grounded to the base plate 10 via the connection member 25.

  In the fourth embodiment, the upper casing 3 is provided with a non-excitation element 26 on the outer surface of the lower casing 2 side (−Z direction). Since the connection member 25 for grounding the excitation element 26 to the base plate 10 is provided, in addition to the same effects as in the first embodiment, the non-excitation element 26 is provided on the outer surface of the upper housing 3. Since the interval between the built-in antennas 12 can be shortened as compared with the first to third embodiments, the electromagnetic coupling between the non-excitation element 26 and the built-in antenna 12 can be made stronger, and the resonance can be made stronger. There is an effect that the radiation power efficiency of the antenna 12 is further improved. Further, since the non-excitation element 26 is provided on the outer surface of the upper casing 3, a space for mounting the non-excitation element 26 in the upper casing 3 can be eliminated. There is an effect that it is possible to obtain a slide-type mobile phone device 1 that can be miniaturized.

  According to the fourth embodiment, the length of the non-excitation element 26 to which the connecting member 25 is added is the same as that of the non-excitation element 16 shown in the first embodiment, and is about 1 / wavelength of the transmitted / received wavelength. Although the length of 4 is shown, the same effect can be obtained even when the length is 3/4 or 1/2 of the wavelength.

  Further, according to the fourth embodiment, the ground plate using the base plate 10 is shown. However, for example, when the lower housing 2 is formed of a conductive material, the ground member is The case 2 may be selected, and the non-excitation element 26 may be grounded to the lower case 2 via the connection member 25.

  Furthermore, according to the fourth embodiment, the non-excitation element 26 is configured to be connected to the connecting member 25 when the slide is closed. However, as illustrated in the second embodiment, the slide is When opened, the non-excitation element 26 may be connected to the connection member 25 and may be positioned opposite to and close to the built-in antenna 12. However, in this case, the matching circuit unit 13 needs to perform impedance matching in a state where the slide is closed.

  In the fourth embodiment, the reactance element 24 described in the third embodiment may be provided between the non-excitation element 26 and the base plate 10. In this case, an effect equivalent to that of the third embodiment is obtained.

Embodiment 5
Next, a sliding mobile phone device according to Embodiment 5 of the present invention will be described with reference to FIGS.

  FIG. 10 is a configuration diagram showing the main configuration of the slide type mobile phone device 1 according to the fifth embodiment of the present invention, and shows a state in which the slide is closed. FIG. 11 is a block diagram showing specific means of operation in the sliding mobile phone device 1. Of the reference numerals used in FIGS. 10 and 11, the same reference numerals as those used in the first embodiment indicate the same or equivalent parts.

  10 and 11, the configuration is different from that of the first embodiment on the base plate 10 of the lower housing 2 so that it can correspond to two different frequencies such as 2 GHz band and 800 MHz band. Are a wireless circuit unit 11 having a wireless circuit, and a first matching circuit unit 30a and a second matching circuit unit 30b that are impedance-matched with respect to two different frequencies in a state where the slide is opened. The antenna switching provided between the radio circuit unit 11 and the first matching circuit unit 30a and the second matching circuit unit 30b for switching between the first matching circuit unit 30a and the second matching circuit unit 30b. A switch 31 and a control unit 32 for operating the antenna changeover switch 31 are provided, and the first matching circuit unit 30a and the second matching circuit unit 30b include two different types. In the frequency is that the first built-in antenna 33a and the second internal antenna 33b to enable transmission and reception respectively is connected. The first built-in antenna 33a and the second built-in antenna 33b are made of, for example, a linear or plate-shaped metal conductor using copper or the like, and have a length of about ¼ of the wavelengths of two different frequencies. It is formed as a monopole antenna. Therefore, for example, the antenna corresponding to the 2 GHz band is shortened, and the antenna corresponding to the 800 MHz band is lengthened. In FIG. 10, the first built-in antenna 33a is shown as a short antenna corresponding to the 2 GHz band, and the second built-in antenna 33b is shown as a long antenna corresponding to the 800 MHz band. Both the first built-in antenna 33a and the second built-in antenna 33b are bent so as to be built in the lower housing 2, and the first built-in antenna 33a is connected to the first matching circuit section 30a. After extending in the −X direction, it is bent at an angle of about 90 degrees in the −Y direction in the vicinity of the inner surface of the lower housing 2. The second built-in antenna 33b extends from the second matching circuit section 30b in the -X direction and is then bent at an angle of about 90 degrees in the -Y direction so that the second built-in antenna 33b is in contact with or near the inner surface of the lower housing 2. It is bent at an angle of about 90 degrees in the -X direction, and is bent at an angle of about 90 degrees in the Y direction at or near the inner surface of the lower housing 2. The bent shapes of the first built-in antenna 33a and the second built-in antenna 33b shown here are examples, and any shape that has the function of an antenna and can be built into the lower housing 2 may be used. .

  On the other hand, on the upper base plate 15, one is installed on the upper base plate 15, and a first reactance composed of a coil or a capacitor that gives a predetermined electric length to the non-excitation element 16 so as to resonate at two different frequencies, respectively. In response to an instruction from the control unit 32, the non-excited element 16 is connected between the element 34a and the second reactance element 34b, and the non-excited element 16 and the first reactance element 34a and the second reactance element 34b. For example, an element changeover switch 35 including an SPDT (Single Pole Double Throw) switch connected to the first reactance element 34a or the second reactance element 34b is provided. In FIG. 11, a coil 36 for cutting high frequencies is provided between the control unit 32 and the element changeover switch 35. The first reactance element 34a and the second reactance element 34b are grounded to the upper base plate 15 via capacitors 37a and 37b for cutting direct current.

  Next, the operation of the sliding mobile phone device 1 according to the fifth embodiment of the present invention will be described with reference to FIGS. Hereinafter, for convenience of explanation, the frequency transmitted and received by the first built-in antenna 33a is referred to as a first frequency, and the frequency transmitted and received by the second built-in antenna 33b is referred to as a second frequency.

  First, an operation in a state where the slide of the slide type mobile phone device 1 is opened will be described.

  In a state where the slide of the slide type mobile phone device 1 is opened, the first built-in antenna 33a and the second built-in antenna 33b are spaced apart from the non-excitation element 16, and therefore the first built-in antenna 33a and the second built-in antenna 33b are separated. The two built-in antennas 33b and the non-exciting element 16 are not electromagnetically coupled, and the non-exciting element 16 does not resonate. Further, the impedances of the first matching circuit unit 30a and the second matching circuit unit 30b are matched so that optimum radiated power efficiency can be obtained when the slide is opened. Therefore, the control unit 32 connects the antenna changeover switch 31 to the first matching circuit unit 30a when the first frequency is selected, and the antenna changeover switch 31 when the second frequency is selected. Is connected to the second matching circuit unit 30b, so that the first built-in antenna 33a and the second built-in antenna 33b are connected to the radio circuit unit via the first matching circuit unit 30a and the second matching circuit 30b, respectively. 11 can be transmitted and received.

  Next, the operation of the sliding mobile phone device 1 in the closed state will be described.

  When the first frequency is first selected in the state in which the slide of the sliding mobile phone device 1 is closed, the control unit 32 connects the antenna changeover switch 31 to the first matching circuit unit 30a, thereby One built-in antenna 33a is connected to the radio circuit unit 11 via the first matching circuit unit 30a, and the first built-in antenna 33a can transmit and receive. At the same time, the control unit 32 connects the element changeover switch 35 to the first reactance element 34a that gives the non-excited element 16 an electrical length that resonates with the first built-in antenna 33a. The ground plate 15 is grounded through one reactance element 34a. At this time, the first built-in antenna 33a and the non-excitation element 16 are electromagnetically coupled because they are opposed and close to each other. The non-excitation element 16 electromagnetically coupled to the first built-in antenna 33 a is grounded to the upper base plate 15, thereby including the upper base plate 15 as an apparent length of the non-excitation element 16. The non-excited element 16 resonates with the first built-in antenna 33a. Therefore, the radiation power efficiency of the first built-in antenna 33a is improved, and a good transmission / reception state is obtained.

  Next, when the second frequency is selected, the control unit 32 connects the antenna changeover switch 31 to the second matching circuit unit 30b so that the second built-in antenna 33b becomes the second matching circuit unit. The second built-in antenna 33b can be transmitted and received by being connected to the radio circuit unit 11 through 30b. At the same time, the control unit 32 connects the element changeover switch 35 to the second reactance element 34b that gives the non-excitation element 16 an electrical length that resonates with the second built-in antenna 33b. The ground plate 15 is grounded via the second reactance element 34b. At this time, the second built-in antenna 33b and the non-exciting element 16 are electromagnetically coupled because they are opposed and close to each other. The non-excitation element 16 electromagnetically coupled to the second built-in antenna 33 b is grounded to the upper base plate 15, thereby including the upper base plate 15 as an apparent length of the non-excitation element 16. The non-excited element 16 resonates with the second built-in antenna 33b. Therefore, the radiation power efficiency of the second built-in antenna 33b is improved, and a good transmission / reception state is obtained.

  It is desirable that the distance between the non-excited element 16 that is electromagnetically coupled to the first built-in antenna 33a and the second built-in antenna 33b is about 1 to 4 mm.

  In the fifth embodiment, the first matching circuit unit to which the first built-in antenna 33a and the second built-in antenna 33b are respectively connected on the base plate 10 so as to correspond to two different frequencies. 30a and the second matching circuit unit 30b, an antenna changeover switch 31 for connecting the radio circuit unit 11 to one of the first matching circuit unit 30a and the second matching circuit unit 30b, and the antenna A control unit 32 for operating the changeover switch 31 is provided, and on the upper base plate 15, each of the first internal antenna 33 a or the second internal antenna 33 b selected by the antenna changeover switch 31 is not excited. Element switching in which the control unit 32 selects the first reactance element 34a or the second reactance element 34b with which the element 16 resonates. Since the switch 35 is provided, the radiation power efficiency can be improved by using a small non-excitation element 16 that can be mounted at the time of opening and closing of the sliding mobile phone device for two different frequencies. There is an effect that it is possible to provide a slide type mobile phone device having communication quality.

  Further, according to the fifth embodiment, the ground plate using the upper base plate 15 is shown. However, for example, when the upper housing 3 is formed of a conductive material, the upper housing is used as the ground member. The body 3 may be selected and the non-excitation element 16 may be grounded to the upper housing 3.

  Further, according to the fifth embodiment, the one using the non-excitation element 16 shown in the first embodiment is shown. However, since the electrical length of the non-excitation element 16 is converted by a predetermined reactance element, the non-excitation is particularly performed. There is no need to limit the length of the element 16.

  Further, according to the fifth embodiment, the configuration is shown in which the non-exciting element 16 is located opposite to and close to the first built-in antenna 33a or the second built-in antenna 33b when the slide is closed. As shown in the second embodiment, when the slide is opened, the non-exciting element 16 may be configured to be in a position facing and close to the first built-in antenna 33a or the second built-in antenna 33b. However, in this case, the first matching circuit unit 30a and the second matching circuit unit 30b need to perform impedance matching in a state where the slide is closed.

  Further, according to the fifth embodiment, the present invention is applied to two different frequencies. However, it is not necessary to limit to two frequencies. When the corresponding frequencies are increased, a built-in antenna, a matching circuit unit, and This can be dealt with by increasing the number of reactance elements corresponding to the required number of frequencies and switching the antenna changeover switch and the element changeover switch according to the corresponding frequency by the control unit.

  Note that Embodiments 1 to 5 shown for the slide-type mobile phone 1 can also be applied to a fold-type mobile phone device.

1 is an external view of a slide type mobile phone device according to the present invention. It is a block diagram which shows the principal part structure of the slide type mobile telephone apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the principal part structure of the slide type mobile telephone apparatus which concerns on Embodiment 1 of this invention. It is a return loss characteristic figure with respect to the frequency in the case of the presence or absence of a non-excitation element when the slide which concerns on Embodiment 1 of this invention is closed. It is a block diagram which shows the principal part structure of the slide type mobile telephone apparatus which concerns on Embodiment 2 of this invention. It is a block diagram which shows the principal part structure of the slide type mobile telephone apparatus which concerns on Embodiment 2 of this invention. It is a block diagram which shows the principal part structure of the slide type mobile telephone apparatus which concerns on Embodiment 3 of this invention. It is a block diagram which shows the principal part structure of the slide type mobile telephone apparatus which concerns on Embodiment 4 of this invention. It is a block diagram which shows the principal part structure of the slide type mobile telephone apparatus which concerns on Embodiment 4 of this invention. It is a block diagram which shows the principal part structure of the slide type mobile telephone apparatus which concerns on Embodiment 5 of this invention. It is a block diagram which shows the specific means of operation | movement in the slide type mobile telephone apparatus which concerns on Embodiment 5 of this invention. It is a return loss characteristic figure with respect to the frequency at the time of opening and closing the slide which concerns on the slide type mobile telephone apparatus which does not provide the conventional non-excitation element.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sliding mobile telephone apparatus 2 Lower housing | casing 3 which is 1st housing | casing 3 Upper housing | casing 4 which is 2nd housing | casing 5 Operation part which consists of various key switches 6 Transmission part 6 A character, image information, etc. are displayed Display unit 7 Reception unit 10 Ground plate 11 as ground member Wireless circuit unit 12 Matching circuit unit 13 Built-in antenna 15 Top plate 16 as ground member Non-excited element

Claims (5)

In the sliding mobile phone device in which the first housing and the second housing are slidably connected,
The first housing includes a built-in antenna for transmitting and receiving,
The second casing includes a ground member serving as a ground, and a non-excitation element that resonates with the built-in antenna at a position where one of the ground members is grounded to the connection member and faces and close to the built-in antenna. A sliding mobile phone device.   The non-excitation element is grounded to the grounding member via a reactance element that converts the non-excitation element to an electrical length at which the non-excitation element resonates with respect to a predetermined frequency to be transmitted and received. Sliding mobile phone device. In the sliding mobile phone device in which the first casing and the second casing are slidably connected,
The first casing includes a built-in antenna for performing transmission and reception, a grounding member as a ground, and a connection member, one of which is grounded to the grounding member and the other is exposed to the outer surface of the first casing. ,
The slide-type mobile phone device comprising a non-excitation element that is connected to the ground member and resonates with the built-in antenna at a position facing and close to the built-in antenna. . In the sliding mobile phone device in which the first housing and the second housing are slidably connected,
The first casing selects a plurality of built-in antennas corresponding to a plurality of frequencies to be transmitted and received one-to-one, and selects a built-in antenna corresponding to a predetermined frequency from the plurality of built-in antennas, thereby enabling transmission / reception. It has an antenna switch,
The second housing includes a grounding member serving as a ground, a non-exciting element that resonates at a position facing and close to the plurality of built-in antennas, one of which is grounded to the grounding member, and A plurality of reactance elements that convert to an electrical length that resonates with the built-in antenna, one of which is connected to the non-excitation element and the other is connected to the plurality of reactance elements, and corresponds to the predetermined frequency among the plurality of reactance elements A slide type mobile phone device comprising an element changeover switch for selecting a reactance element for converting the electrical length of the non-excitation element so as to resonate with the selected built-in antenna. 5. The sliding mobile phone device according to claim 4, further comprising a control unit that receives a predetermined frequency and performs a switching operation of the antenna changeover switch and the element changeover switch.

Images