JP2006005409A - Mobile communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication terminal capable of excellently receiving digital broadcast radio waves of digital television broadcast and digital radio broadcast or the like by ensuring a required antenna length without losing the design performance and the portability. <P>SOLUTION: The mobile phone terminal capable of transceiving a CDMA wave and receiving even a digital broadcast radio wave is equipped with a digital broadcast radio wave antenna having an antenna radiation conductor 6 of nearly a U-shaped form freely extendable and contractable in directions of the arrows 7. Since the nearly U-shaped antenna radiation conductor 6 acts like a large sheet plate antenna of the nearly U-shaped form, the antenna can obtain a large radiation resistance and improve the radiation efficiency, and when the nearly U-shaped antenna radiation conductor 6 is extended, the antenna length can be extend to thereby capable of enhancing the reception sensitivity of the digital broadcast radio wave with a frequency band lower than that of the CDMA wave. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a portable communication terminal capable of receiving terrestrial digital broadcasting radio waves such as terrestrial digital television broadcasting and digital radio broadcasting.

  In recent years, portable communication terminals such as mobile phones have often adopted a structure (so-called built-in antenna) in which an antenna radiating conductor portion is housed in a casing for reasons such as improving design viewpoint and portability. ing.

  FIG. 10 shows an example of a mobile phone terminal incorporating an antenna radiation conductor portion.

  The mobile phone terminal shown in FIG. 10 includes a first housing 101 including a display panel 104 made of a liquid crystal device, an operation unit 105 such as a numeric keypad, and a main board (PCB: Printed Circuit Board) therein. The second casing 102 is connected to the display panel 104 or the operation unit 105 via a hinge mechanism 103 having a rotation axis substantially parallel to the surface of the display panel 104 or the operation unit 105, and can be rotated relative to each other. The terminal is a so-called foldable terminal that can be folded in two so that the first and second casings 101 and 102 can be folded on each other. In the foldable mobile phone terminal as shown in FIG. 10, the radiating conductor of the built-in antenna is on the lower end side of the second casing 102 provided with the main substrate, that is, both ends in the longitudinal direction of the second casing 102. Of these parts, it is provided on the end side far from the hinge mechanism 103. Note that the reason why the radiating conductor of the built-in antenna is provided on the second housing 102 side as described above is, for example, that the radiation conductor of the built-in antenna is provided on the first housing 101 side. This is because the main board and the antenna radiation conductor must be connected by a coaxial cable or the like via the hinge mechanism 103.

  FIG. 11 shows an arrangement example between the main board 110 in the second housing 102 and the radiation conductor of the built-in antenna. FIG. 12 shows a connection example of the main board 110 and the radiation conductor of the built-in antenna in the second housing 102. FIGS. 11 and 12 show an example in which, for example, a CDMA (Code Division Multiple Access) antenna radiating conductor 115 and a GPS (Global Positioning System) antenna radiating conductor 113 are provided as radiating conductors of the built-in antenna. . Further, in the arrangement example of FIG. 11, the CDMA antenna radiating conductor 115 and the like and the main board 110 are drawn in a state where the illustration and explanation are easy to understand.

  11 and 12, the main board 110 is provided, for example, on the back side of the operation unit 105 of the second housing 102. The main board 110 has a spring connection part 112 made of a conductive material. The provided connector 111 is provided. The connector 111 is disposed on the lower end side of the main board 110. The CDMA antenna radiating conductor 115 and the GPS antenna radiating conductor 113 are arranged in the lower end portion of the second casing 102 and have spring connecting portions 116 and 114 made of conductive members, respectively. The main board 110 is electrically connected by contacting the spring connection part 112 of the connector 111 through the connection parts 116 and 114.

  For example, when transmitting and receiving CDMA waves with the cellular phone terminal open, the length of the CDMA antenna radiating conductor 115 and the ground of the main panel 110 and the display panel substrate of the first housing 101 are increased. Different dipole antennas are formed, and CDMA radio waves are transmitted and received.

  Recently, it has been desired that mobile phone terminals can receive terrestrial digital television broadcast waves. However, at present, mobile phone terminals capable of receiving digital television broadcast waves have not yet been put into practical use.

  Note that a mobile phone disclosed in Non-Patent Document 1 is known as a mobile terminal capable of receiving terrestrial digital television broadcast radio waves. The mobile phone described in Non-Patent Document 1 has a function of receiving digital terrestrial television broadcast radio waves, and a large external antenna provided separately from a transmission / reception antenna used for the mobile phone function allows Digital television broadcast radio waves can be received.

[Search April 1, 2004], Internet <URL: http://ascii24.com/news/i/tech/article/2003/08/08/645414-000.html?gate

  In digital television broadcasting, a large number of channels of 13ch to 53ch are set, and the frequency band of the broadcast radio wave is 470 MHz to 716 MHz, which is lower than the frequency band of the CDMA wave.

  The frequency used for digital terrestrial television broadcasting (470 MHz to 716 MHz) is lower than the frequency used for CDMA (832 MHz to 925 MHz). For this reason, the length required for the antenna for digital television broadcasting is longer than that for the antenna for CDMA. If the CDMA antenna is shared, the radiation resistance is lowered due to the shortage of the antenna length, and the radiation efficiency is lowered.

  The reception function of digital radio broadcasting is one of the functions expected to be installed in mobile phone terminals. However, the frequency used for digital radio broadcasting is the 190 MHz band, and the length required for the antenna is further increased. For this reason, it is very difficult to share the CDMA antenna. If a CDMA antenna is used with the characteristics being allowed to deteriorate, the characteristics required for the subsequent circuit will be high.

  The present invention has been proposed in view of such circumstances, ensuring a necessary antenna length without impairing design and portability, and providing digital broadcasting radio waves such as digital television broadcasting and digital radio broadcasting. An object of the present invention is to provide a portable communication terminal that can receive well.

  The mobile communication terminal of the present invention is a mobile communication terminal that receives radio waves of at least a predetermined frequency band, and has open ends of two stretchable conductors having one end integrated into a substantially U shape. A substantially U-shaped radiation conductor whose side is electrically connected to the power feeding element at least in high frequency, at least the open end side is accommodated in the terminal casing, and the integrated end side can be pulled out to the outside of the terminal casing The above-described problem is solved by providing a substantially U-shaped antenna having the following.

  In addition, the mobile communication terminal of the present invention includes a terminal exterior panel that is configured by a conductive member and that can slide on the terminal housing in a state of being electrically conducted at least in high frequency to the ground conductor of the substantially U-shaped antenna. By having it, the above-described problems are solved.

  That is, in the mobile communication terminal of the present invention, the substantially U-shaped antenna functions as a large U-shaped single sheet metal antenna, so that the radiation resistance can be increased and the radiation efficiency can be improved. Further, since the radiating conductor of the substantially U-shaped antenna is made extendable, the length of the substantially U-shaped antenna can be varied, and in particular, the radiating conductor of the substantially U-shaped antenna is stretched. Increasing the length makes it possible to receive low-frequency radio waves.

  The portable communication terminal of the present invention has a conductive terminal exterior panel that is at least high-frequency conductive with the ground conductor of the substantially U-shaped antenna, and slides the terminal exterior panel to provide a substantially U-shape. The length of the antenna can be varied, especially when the terminal exterior panel is slid away from the radiating conductor of the substantially U-shaped antenna to increase the antenna length and receive lower frequency radio waves. It becomes possible. In the mobile communication terminal of the present invention, the impedance can be finely adjusted by sliding the terminal exterior panel.

  In the present invention, by providing a substantially U-shaped antenna that can be expanded and contracted, a necessary antenna length can be secured without impairing design and portability. In particular, the antenna is extended by extending the substantially U-shaped antenna. If the length is increased, digital broadcast waves such as digital television broadcast and digital radio broadcast can be received well.

  Hereinafter, an embodiment of a mobile communication terminal of the present invention will be described with reference to the drawings. In the following description, a CDMA mobile phone terminal is cited as an embodiment of the present invention. Of course, the content described here is merely an example, and it goes without saying that the present invention is not limited to this example.

[Appearance of mobile phone terminal of this embodiment]
FIG. 1 shows an appearance of a mobile phone terminal according to an embodiment of the present invention. The mobile phone terminal according to the present embodiment shown in FIG. 1 includes a first housing 1 having a display panel 4 made of a liquid crystal device or the like, an operation unit 5 such as a numeric keypad, and a main board (PCB) therein. The second casing 2 can be rotated with each other via a hinge mechanism (connecting portion) 3 having a rotation axis substantially parallel to the surface of the display panel 4 or the operation portion 5. Thus, the first and second casings 1 and 2 are so-called folding type terminals that can be folded in two so as to be folded on each other.

[Specific example of antenna]
The foldable mobile phone terminal of the present embodiment is located inside the lower end of the second housing 2 (the end of the second housing 2 in the longitudinal direction far from the hinge mechanism 3). Equipped with antenna radiation conductor for CDMA. In addition, the mobile phone terminal according to the present embodiment can be partially or fully accommodated in the second housing 2 as an antenna for receiving digital broadcasting radio waves such as digital television broadcasting and digital radio broadcasting, and can be expanded and contracted. It is equipped with a digital broadcasting radio wave antenna having a conductive substantially U-shaped antenna radiation conductor 6 that is freely configured. The CDMA antenna radiating conductor and the substantially U-shaped antenna radiating conductor 6 are connected to a feeding point (not shown). In other words, in the present embodiment, the substantially U-shaped antenna radiating conductor 6 has at least the power supply element at the open end side of two extensible and retractable leg conductors formed by integrating one end side into a substantially U shape. Conducted in high frequency, the open end side is accommodated in the second terminal 2, and the integrated end side can be pulled out to the outside of the second housing 2.

  FIG. 2 shows an arrangement example of the main board 10 in the second housing 2, the CDMA antenna radiating conductor 15, the substantially U-shaped antenna radiating conductor 6 of the digital broadcasting radio wave antenna, and the like. FIG. 2 shows an example in which a GPS antenna radiation conductor 13 is provided together with the CDMA antenna radiation conductor 15 as a radiation conductor of the built-in antenna. In the configuration example of FIG. 2, the CDMA antenna radiating conductor 15 and the substantially U-shaped antenna radiating conductor 6 of the digital broadcasting radio wave antenna are separated from the main board 10 for easy understanding of the illustration and explanation. It is drawn in.

  In FIG. 2, the main substrate 10 is provided, for example, inside the back side housing of the operation unit 5 of the second housing 2, and the main substrate 10 includes a spring connection portion 12 made of a conductive material. A connector 11 is provided. The connector 11 is disposed on the lower end side of the main board 10. The CDMA antenna radiating conductor 15 and the GPS antenna radiating conductor 13 are arranged in the lower end portion of the second casing 2 and have spring connecting portions 16 and 14 made of conductive members, respectively. Similar to the example of FIG. 12, the main board 10 is electrically connected by contacting the spring connection part 12 of the connector 11 via the spring connection parts 16 and 14. In the mobile phone terminal of the present embodiment, the CDMA antenna radiating conductor 15 is provided with two through-hole portions 17 and 17 described later.

  For example, when transmitting and receiving CDMA waves with the cellular phone terminal opened, the display of the first casing 1 connected to the CDMA antenna radiation conductor 15 via the ground of the main board 10 and the hinge mechanism 3. Dipole antennas having different lengths are formed by the ground of the panel substrate, and CDMA radio waves are transmitted and received. Similarly, when transmitting and receiving GPS waves, the GPS antenna radiation conductor 13 and the ground of the main substrate 10 and the ground of the display panel substrate of the first housing 1 connected via the hinge mechanism 3 are used. A dipole antenna having a different length is formed to transmit and receive radio waves of GPS waves.

[Antenna for digital broadcasting radio wave: U-shaped antenna radiation conductor]
On the other hand, the digital broadcasting radio wave antenna has a substantially U-shaped antenna radiating conductor 6 as shown in FIGS. 1 to 4, and the two leg conductors of the substantially U-shaped antenna radiating conductor 6 are the above-mentioned. The CDMA antenna radiating conductor 15 is slidably inserted into the two through-hole portions 17 and 17 in a state of being electrically conducted at least in high frequency. That is, in the digital broadcasting radio wave antenna of the present embodiment, the substantially U-shaped antenna radiating conductor 6 is electrically connected to the CDMA antenna radiating conductor 15 at least in high frequency, and the substantially U-shaped antenna radiating conductor 6 and A dipole antenna is formed by the CDMA antenna radiation conductor 15 and the ground of the display panel substrate connected via the ground of the main substrate 10 and the hinge mechanism 3, and can receive digital broadcasting radio waves. 3 and 4 show only the CDMA antenna radiating conductor 15 and the GPS antenna radiating conductor 13 and the substantially U-shaped antenna radiating conductor 6 of the digital broadcasting radio wave antenna.

  Here, the substantially U-shaped antenna radiating conductor 6 of the digital broadcasting radio wave antenna is at least high frequency in each of the two through holes 17 and 17 of the CDMA antenna radiating conductor 15 as shown in FIGS. Two first rod portions 21 that are slidably inserted in a conductive state, and can be stored in the two first rod portions 21 and 21, respectively, and in a sliding state that is at least high-frequency conductive. The two second rod portions 22 can be pulled out only by a fixed amount, and the leg conductors can be accommodated in the two second rod portions 22 and 22 and are slid at least at high frequencies. It has a U-shaped rod portion 23 that can be pulled out only by a fixed amount, and has a so-called rod-type configuration that can be expanded and contracted (that is, the length is variable) in the direction indicated by an arrow 7 in the figure.3 shows a state in which the rod is contracted and the U-shaped antenna radiating conductor 6 is housed in the second housing 2 while leaving the U-shaped rod portion 23, and FIG. The state which extended the rod of the character-shaped antenna radiation | emission conductor 6 is shown. In the example of FIG. 3, in a state where the substantially U-shaped antenna radiating conductor 6 is housed in the second housing 2, the U-shaped rod portion 23 of the substantially U-shaped antenna radiating conductor 6 is the second housing. Although the example which protrudes from 2 outer walls is given, the 2nd housing | casing 2 concerning this invention is accommodated in the inside so that the U-shaped rod part 23 of the said substantially U-shaped antenna radiation | emission conductor 6 can be pulled out. May be provided.

  On the open end side of the two first rod portions 21, 21 of the substantially U-shaped antenna radiating conductor 6, it is attached to the wall surface of the CDMA antenna radiating conductor 15 when being pulled out of the second housing 2. By abutting, the two first rod portions 21 and 21 are prevented from falling out of the through-hole portions 17 and 17, and at the same time, the abutting portions 20 and 20 that are electrically connected to the CDMA antenna radiation conductor 15 at least in high frequency. Is provided.

  3 and 4, a rod type that can be expanded and contracted in two stages is given as an example of the substantially U-shaped antenna radiation conductor 6, but the present invention is a rod type that can expand and contract in one or more stages. Needless to say, this is also applicable. Further, the shape of the radiation conductor of the digital broadcasting radio wave antenna is not limited to a substantially U shape as in the examples of FIGS.

  As described above, in the digital broadcasting radio wave antenna according to the present embodiment, the substantially U-shaped antenna radiating conductor 6 portion is a rod type and can be stretched, and the substantially U-shaped antenna radiating conductor 6 is stretched. In this case, since it functions as a large U-shaped single sheet metal antenna, radiation resistance can be increased and radiation efficiency can be improved as compared with the case of using a conventional whip antenna. Also, since the frequency of digital television broadcast radio waves is about 470 MHz to 716 MHz and the bandwidth is about 240 MHz, it was difficult to cover the frequency band with a conventional whip antenna. According to the digital broadcasting radio wave antenna provided with the U-shaped antenna radiation conductor 6, the sensitivity can be improved in any channel (13ch to 53ch) of digital television broadcasting.

  In this embodiment, the substantially U-shaped antenna radiating conductor 6 of the digital broadcasting radio wave antenna is a rod type that can be stretched, and the length of the substantially U-shaped antenna radiating conductor 6 is increased by the expansion and contraction of the rod. Since it can be varied, the impedance can be adjusted according to the frequency of the digital broadcast radio wave.

  Further, the substantially U-shaped antenna radiating conductor 6 of the digital broadcasting radio wave antenna according to the present embodiment can change the impedance of the antenna by changing its length. Therefore, an antenna matching circuit (matching circuit) is used for CDMA. And digital broadcasting radio waves can be shared. That is, the CDMA antenna radiating conductor 15 and the digital broadcasting radio wave antenna substantially U-shaped antenna radiating conductor 6 are connected to one matching circuit, and the input / output terminal of the matching circuit and the subsequent RF circuit are connected to, for example, a switch. The matching circuit can be shared by switching and connecting via the network. The detailed configuration of the antenna, matching circuit, switch circuit, etc. will be described later.

  Furthermore, according to the digital broadcasting radio wave antenna of the present embodiment, the CDMA antenna radiating conductor 15 and the substantially U-shaped antenna radiating conductor 6 are integrated through the through-hole portions 17 and 17, so that digital For example, it is possible to suppress an increase in the size of the configuration as in the case where a broadcasting radio wave antenna is provided separately.

  In addition, according to the digital broadcasting radio wave antenna of the present embodiment, the substantially U-shaped antenna radiation conductor 6 can be stored in the second casing 2, so that design and portability are not impaired. .

[Antenna for digital broadcasting radio wave: decorative panel type radiation conductor]
The digital broadcasting radio wave antenna according to the present invention is replaceable as shown in FIGS. 5 to 8 as well as the substantially U-shaped antenna radiating conductor 6 shown in FIGS. A panel-type antenna ground conductor 31 that is slidable in the direction of arrow 37 in the figure in a sliding state may be provided.

  The panel-type antenna ground conductor 31 of the present embodiment is made of, for example, a conductive material such as a conductive plastic or a plastic provided with a metal thin film, and is, for example, a decorative panel that is replaceably mounted on the first housing 1. It has the function of. In other words, the decorative panel is a panel having a color or pattern according to the user's preference, for example, detachably mounted on the back side of the surface of the first housing 1 on which the display panel 3 is provided. In addition, the panel is made of a conductive material and has a function as an antenna ground conductor, for example, by being electrically connected to the ground of the display panel 3 of the first housing 1 at least in high frequency. 5 closes the mobile phone terminal of the present embodiment, and the panel-type antenna ground conductor is located outside the front end of the first housing 1 (the front end opposite to the end on the hinge mechanism 3 side). The state which 31 was slid is shown. FIG. 6 shows a schematic cross section of the mobile phone terminal of this embodiment in the closed state as shown in FIG. 5 as viewed from the shaft side of the hinge mechanism 3. However, in FIG. 6, only the display substrate (PCB) 37 and the display panel 3 are used as the internal configuration of the first housing 1, and only the main substrate 10 and the battery 38 are used as the internal configuration of the second housing 2. Show. FIG. 7 shows one of the conductive slide rail members 32a and 32b (32b) which is provided on the first housing 1 and slides with the panel-type antenna ground conductor 31 attached and electrically connected. FIG. 8 shows that the cellular phone terminal of the present embodiment is opened, the panel-type antenna ground conductor 31 is slid outside the front end of the first housing 1, and the aforementioned substantially U-shaped antenna radiation. The conductor 6 is drawn from the second housing 2 and the rod is extended.

  Here, the conductive slide rail members 32a and 32b are made of a conductive material such as aluminum, for example, and as shown in FIGS. 5 to 8, the surface of the first housing 1 on the surface on which the display panel 3 is provided. Provided on the back side. Further, as shown in FIGS. 6 and 7, the conductive slide rail members 32a and 32b (only the conductive slide rail member 32b is shown in FIG. 7) are fixed to the fixing portion 36b of the first housing 1. The rail-shaped main body portion 35b, the spring connecting portion 33b provided at, for example, the end of the rail-shaped main body portion 35b, and the ground of the display substrate 37 inside the first housing 1 via the spring connecting portion 33b. For example, a V-shaped contact portion 34b for electrically connecting the rail-shaped main body portion 35b. When using the coupling between the panel antenna ground conductor 31 and the ground of the display substrate 37, the conductive slide rail members 32a and 32b as shown in FIGS. 6 and 7 do not necessarily need to be in contact with each other.

  As described above, in the digital broadcasting radio wave antenna of the present embodiment, the slidable panel antenna ground conductor 31 is provided on the first casing 1, and the panel antenna ground conductor 31 is connected to the first casing. The total length of the antenna can be increased by sliding it toward the tip end side of the antenna 1, that is, by sliding it away from the antenna radiation conductor provided at the lower end of the second housing 1. . In particular, as shown in FIG. 8, the cellular phone terminal of the present embodiment is opened, the panel-type antenna ground conductor 31 is slid outside the front end of the first housing 1, and a substantially U-shaped antenna is provided. When the radiation conductor 6 is pulled out from the second housing 2 and the rod is extended, the total length of the digital broadcasting radio wave antenna is maximized. As a result, the cellular phone terminal of this embodiment is, for example, a digital television. It is also possible to improve the reception characteristics of digital radio broadcast radio waves (190 MHz band) having a frequency lower than that of broadcast radio waves.

  Further, according to the digital broadcasting radio wave antenna of this embodiment, the impedance (and consequently the radiation efficiency) can be finely adjusted according to the frequency of the digital broadcasting radio wave by sliding the panel type antenna ground conductor 31. It becomes like this.

  Further, in the digital broadcasting radio wave antenna of the present embodiment, the antenna impedance can be varied by sliding the panel type antenna ground conductor 31 to change the length of the antenna. It can be shared for John broadcast radio waves and digital radio broadcast radio waves.

  Furthermore, according to the digital broadcasting radio wave antenna of the present embodiment, the panel-type antenna ground conductor 31 is a decorative panel, so that the design can be improved.

[Internal circuit configuration of mobile phone terminal of this embodiment]
Next, FIG. 9 shows a schematic circuit configuration inside the mobile phone terminal of the present embodiment.

  In FIG. 9, an antenna 41 is a digital broadcasting radio wave antenna having the U-shaped antenna radiating conductor 6 and the panel-type antenna ground conductor 31, and an antenna 42 is a CDMA antenna having a CDMA antenna radiating conductor 15. is there. The antenna 43 is a GPS antenna having a GPS antenna radiation conductor 13. The digital broadcast radio wave antenna 41 and the CDMA antenna 42 are connected to the common terminal of the first switch 47 of the switch circuit 46 via the first matching circuit 44, while the GPS antenna 43 is connected to the second antenna 47. The matching circuit 45 is connected to the second switch 48 of the switch circuit 46.

  The first switch 47 includes three switched terminals 47a, 47b and 47c. The switched terminal 47a is connected to a digital radio broadcast radio wave receiving circuit 49, and the switched terminal 47b is received for a digital television broadcast radio wave. The circuit 50 and the switched terminal 47c are connected to the CDMA transceiver circuit 51. The second switch 48 is connected to the GPS receiving circuit 52. The first switch 47 and the second switch 48 are switched and controlled by a CPU (Central Processing Unit) 55 in the subsequent stage. That is, the CPU 55 connects the switched terminal 47a with the common terminal when receiving the digital radio broadcast radio wave, and connects the switched terminal 47b with the common terminal when receiving the digital television broadcast radio wave. When transmitting / receiving CDMA waves, the first switch 47 is controlled so that the switched terminal 47c is connected to the common terminal. The second switch 48 is controlled by the CPU 55 so that it is closed (ON) only when receiving a GPS wave, and is open (OFF) otherwise.

  The digital radio broadcast radio wave receiving circuit 49 receives the digital broadcast radio wave antenna 41 and amplifies or RF band the digital radio broadcast signal supplied via the first matching circuit 44 and the first switch 47 from the RF band. Reception processing such as frequency conversion to the baseband, filtering, and demodulation is performed, and the result is sent to a baseband LSI (Large Scale Integrated circuit) 53. The digital television broadcast radio wave reception circuit 50 amplifies or RFs the digital television broadcast signal received by the digital broadcast radio wave antenna 41 and supplied via the first matching circuit 44 and the first switch 47. Reception processing such as frequency conversion from the band to the baseband, filtering, demodulation, etc. is performed and the result is sent to the baseband LSI 53. The CDMA transmission / reception circuit 51 amplifies the frequency of the CDMA reception signal received by the CDMA antenna 42 and supplied via the first matching circuit 44 and the first switch 47 and the frequency from the RF band to the baseband. Reception processing such as conversion, filtering, and demodulation is performed and the result is sent to the baseband LSI 53. The CDMA transceiver circuit 51 performs transmission processing such as modulation, frequency conversion to the RF band, and amplification on the transmission signal supplied from the baseband LSI 53, and the first switch 47 and the first matching circuit. Then, the data is transmitted to the CDMA antenna 42 via 44. That is, in the mobile phone terminal of this embodiment, the first matching circuit 44 is shared by the digital broadcast radio wave and the CDMA by switching with the first switch 47 of the switch circuit 46.

  The GPS reception circuit 52 amplifies or frequency from the RF band to the baseband band with respect to the GPS reception signal received by the GPS antenna 43 and supplied via the second matching circuit 45 and the second switch 48. Reception processing such as conversion, filtering, and demodulation is performed and the result is sent to the baseband LSI 53.

  The baseband LSI 53 has a DSP (Digital Signal Processor) 54 and a CPU 55. The DSP 54 performs processing such as decoding of digital radio reception signals and digital television reception signals, despreading and decoding of CDMA reception signals, spreading and encoding of CDMA transmission signals, and decoding of GPS reception signals. The CPU 55 performs control of each component of the mobile phone terminal, switching control of the first and second switches 47 and 48 of the switch circuit 46, various arithmetic processes, and the like.

  The baseband LSI 53 includes, for example, an audio module 56, a video module 57, a user interface (I / F) module 58, a RAM (Random Access Memory) 59, and a ROM (Read Only Memory) via a data bus or a control bus. Various components such as 60 and a GPS module 61 are connected.

  The audio module 56 includes a circuit that performs audio signal processing for transmission / reception voice in a cellular phone function, audio signal processing for digital television broadcasting and digital radio broadcasting, a microphone, a speaker, a signal amplification amplifier, and the like. .

  The video module 57 includes a circuit for performing video display such as digital television broadcasting, telephone number display and e-mail display in the mobile phone function, and other various video display processing, and a display panel provided in the first housing 1. 3 and its drive circuit.

  The user interface module 58 includes a key of the operation unit 5 provided in the second housing 2, a circuit that processes an operation signal from the operation unit 5, and the like.

  The RAM 59 is used as a work area area when the CPU 55 performs various data processing.

  The ROM 60 stores a control program for the CPU 55 to control each unit, various initial setting values, various application programs, a telephone number of the mobile phone terminal, font data, map data, and the like. This ROM includes a rewritable ROM such as an EEPROM (Electrically Erasable and Programmable Read Only Memory), data such as e-mails to be sent and received, telephone books and e-mail addresses set by the user, various downloaded It is also possible to save data, other user setting values, and the like.

  The GPS module 61 detects the current position of the mobile phone terminal using the GPS reception signal and the map data stored in the ROM 60.

  In addition, although not shown, a camera module or the like for taking a still image or a moving image may be provided.

  The above description of the embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made according to the design or the like as long as the technical idea according to the present invention is not deviated.

  In the present embodiment, a foldable mobile phone terminal is taken as an example. However, a so-called straight type mobile phone terminal, a first housing having a display panel, and a second housing having an operation unit, However, a rotary open type mobile phone terminal that is rotatable in a horizontal direction with respect to each other via a hinge mechanism having a rotation axis that is substantially perpendicular to the surface of the display panel or the operation unit, A terminal in which three or more housings are folded or rotated in a horizontal direction via a connecting part such as a hinge, or a first housing having a display panel and the display surface of the display panel in the same direction The second casing having the operation unit on the surface to be used can be applied to a slide-type terminal or the like that can slide linearly in the horizontal direction.

  The present invention is not limited to a mobile phone terminal, and can be applied to various mobile terminals such as a PDA (Personal Digital Assistant) having a wireless communication function, a notebook personal computer, and a digital camera.

It is a figure which shows the schematic external appearance structure of the folding type | mold mobile telephone terminal of this invention embodiment. It is a figure used for description of the example of arrangement | positioning of the main board | substrate in a 2nd housing | casing, the substantially U-shaped antenna radiation conductor of a CDMA antenna radiation conductor, and a digital broadcasting radio wave antenna. It is a figure which shows the state which retracted the rod and stored the substantially U-shaped antenna radiation conductor inside the 2nd housing | casing, leaving a U-shaped rod part. It is a figure which shows the state which extended the rod of the substantially U-shaped antenna radiation | emission conductor. It is a figure which shows the state which closed the mobile telephone terminal of this embodiment, and slid the panel type | mold antenna ground conductor outside the front-end | tip part of the 1st housing | casing. It is a figure which shows the schematic cross section which looked at the mobile telephone terminal of this embodiment of the closed state of FIG. 5 from the axial side of the hinge mechanism. It is a figure which shows schematic structure of the electroconductive slide rail member provided on a 1st housing | casing. While opening the mobile phone terminal of the present embodiment, sliding the panel-type antenna ground conductor to the outside of the front end of the first housing, and pulling out the substantially U-shaped antenna radiation conductor from the second housing It is a figure which shows the state which extended the rod. It is a block circuit diagram showing a schematic circuit configuration inside the mobile phone terminal of the present embodiment. It is a figure which shows the schematic external appearance structure of the conventional mobile telephone terminal which incorporated the antenna radiation | emission conductor part. It is a figure used for description of the example of arrangement | positioning between the main board | substrate in the 2nd housing | casing of the conventional mobile telephone terminal, and the radiation | emission conductor of a built-in antenna. It is a figure used for description of the example of a connection of the main board | substrate, the radiation conductor of a built-in antenna, etc. in the 2nd housing | casing of the conventional mobile telephone terminal.

Explanation of symbols

  1 first housing, 2 second housing, 3 hinge mechanism, 4 display panel. 5 Operation section, 6 U-shaped antenna radiation conductor, 10 Main board, 13 GPS antenna radiation conductor, 12, 14, 16, 33a, 33b Spring connection section, 17 Through hole section, 20 Contact section, 21 First Rod part, 22 Second rod part, 23 U-shaped rod part, 31 Panel-type antenna ground conductor, 32 Conductive slide rail member, 35 Rail-shaped main body part, 36 Fixing part, 37 Display substrate, 38 Battery, 41 Digital broadcasting radio wave Antenna, 42 CDMA antenna, 43 GPS antenna, 44 first matching circuit, 45 second matching circuit, 46 switch circuit, 47 first switch, 48 second switch, 49 reception for digital radio broadcast wave Circuit, 50 digital television broadcasting radio wave receiving circuit, 51 CDMA transceiver circuit, 52 GP Use the receiving circuit, 53 a baseband LSI, 54 DSP, 55 CPU, 56 audio module, 57 video modules, 58 user interface module, 59 RAM, 60 ROM, 61 GPS module

Claims (7)

In a mobile communication terminal that receives radio waves of at least a predetermined frequency band,
The open end side of the two stretchable conductors formed by integrating one end side into a substantially U shape is electrically connected to the power feeding element at least in high frequency, and at least the open end side is accommodated in the terminal housing. A portable communication terminal comprising: a substantially U-shaped antenna having a substantially U-shaped radiation conductor configured such that the integrated end portion can be pulled out to the outside of the terminal housing. The mobile communication terminal according to claim 1,
Comprising a built-in antenna having a radiation conductor built into the terminal housing;
A portable communication terminal characterized in that the open end side of the two conductors of the substantially U-shaped antenna and the radiation conductor of the built-in antenna are electrically connected at least in high frequency. The mobile communication terminal according to claim 2, wherein
A first signal processing circuit for processing a signal of the substantially U-shaped antenna;
A second signal processing circuit for processing the signal of the built-in antenna;
An antenna matching circuit connected to the substantially U-shaped antenna and the built-in antenna;
A portable communication terminal comprising switching means for switching and connecting either the first signal processing circuit or the second signal processing circuit to the antenna matching circuit. The mobile communication terminal according to claim 2, wherein
The built-in antenna transmits and receives CDMA waves,
The mobile communication terminal characterized in that the substantially U-shaped antenna receives digital broadcast radio waves. The mobile communication terminal according to claim 1,
A mobile communication terminal comprising a terminal exterior panel configured to be slidable on the terminal housing in a state of being electrically conductive and at least high-frequency conductive to the ground conductor of the substantially U-shaped antenna. . The mobile communication terminal according to claim 5,
A portable communication terminal, wherein the terminal exterior panel is a replaceable decorative panel. The mobile communication terminal according to claim 5,
At least first and second terminal housings;
A connecting portion that connects the first and second terminal housings and can change the relative positional relationship between the terminal housings;
Providing the terminal exterior panel on the first terminal casing;
A mobile communication terminal comprising the substantially U-shaped antenna on the other end side corresponding to the one end on the connecting portion side of the second terminal housing.

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