JP4716317B2 - transceiver - Google Patents

Description

  The present invention relates to a radio device, and more particularly to a radio device sharing, for example, two different frequency bands.

  Conventionally, as this type of wireless device, one disclosed in Patent Document 1 is known. This prior art includes a retractable external antenna and a built-in antenna. When the external antenna is taken out from the storage hole, the external antenna and the built-in antenna are connected to each other, and both antennas function as one common antenna. When the external antenna is stored in the storage hole, the connection between the external antenna and the built-in antenna is released, and the built-in antenna functions as a shared antenna by itself.

The built-in antenna is provided with a parallel resonant element, and by adjusting the parallel resonant element, good characteristics can be obtained for both of two different frequency bands in a state where the external antenna is housed in the housing hole. Yes.
JP-A-5-304408 [H01Q 1/24, H04B 7/26, H04M 1/00, 1/02]

  However, in the prior art, since the parallel resonant element is used for adjusting the antenna characteristics, there is a problem that the configuration around the antenna becomes complicated.

  SUMMARY OF THE INVENTION Therefore, a main object of the present invention is to provide a radio device that can obtain good antenna characteristics with a simple configuration.

Radio according to the present invention of claim 1, in a stretched state as a length suitable for both the first frequency band and second frequency band is taken out from the antenna NaOsamu pay section, in abbreviated state where the length suitable for the second frequency band A first antenna (12) housed in the antenna housing section, a second antenna (14) coupled to the first antenna via an insulating member (16d) and having a length suitable for the first frequency band, Two first conductive members (16b, 16c) provided, one second conductive member (16a) provided in the second antenna, and two third conductive members (16e, 16f) provided in the vicinity of the antenna housing portion And connecting one of the two first conductive members to each of the two third conductive members when the first antenna is in the extended state, and the other of the two first conductive members when the first antenna is in the shortened state. And one second conductive member to two third conductive members. Each has to be connected.

  The first antenna is taken out from the antenna housing portion in the extended state and is housed in the antenna housing portion in the shortened state. The length in the stretched state is suitable for both the first frequency band and the second frequency band, and the length in the shortened state is suitable for the second frequency band. The second antenna is coupled to the first antenna through an insulating member. The length of the second antenna is suitable for the first frequency band.

  The first antenna is provided with two first conductive members, and the second antenna is provided with one second conductive member. In addition, two third conductive members are provided in the vicinity of the antenna housing portion. When the first antenna is in the extended state, one of the two first conductive members is connected to each of the two third conductive members. On the other hand, when the first antenna is in the shortened state, the other of the two first conductive members and the one second conductive member are connected to the two third conductive members, respectively.

  Therefore, the first frequency signal and the second frequency signal belonging to the first frequency band and the second frequency band, respectively, are captured by the first antenna in the expanded state, and are respectively captured by the second antenna and the first antenna in the shortened state. The captured first frequency signal and second frequency signal can be respectively extracted from the two third conductive members.

  Thus, the length of the first antenna and the connection relationship between the two third conductive members are switched between the extended state and the shortened state. As a result, good antenna characteristics can be obtained in the extended state and the shortened state with a simple configuration.

  The radio according to the invention of claim 2 is dependent on claim 1, wherein one of the two first conductive members is provided at the base side end of the first antenna, and the other of the two first conductive members is the first antenna. At the end of the apex side.

  When the first antenna is in the extended state, one of the two first conductive members, that is, the first conductive member provided at the base side end of the first antenna is connected to each of the two third conductive members. When the first antenna is in a shortened state, the first conductive member and the one second conductive member provided at the other end of the two first conductive members, that is, the apex side end of the first antenna, are two third conductive members. Connected to each.

  A radio according to the invention of claim 3 is dependent on claim 1 or 2, wherein the two third conductive members are arranged along the length direction of the antenna housing portion, and one of the two first conductive members is two It has a length straddling the third conductive member, and the interval between the other of the two first conductive members and the one second conductive member corresponds to the interval between the two third conductive members.

  Since one of the two first conductive members has a length straddling the two third conductive members, it can be connected to each of the two third conductive members. The other of the two first conductive members and the one second conductive member can be connected to the two third conductive members, respectively, because the distance corresponds to that of the two third conductive members.

  According to a fourth aspect of the present invention, there is provided a radio according to any one of the first to third aspects, wherein the first content corresponding to the first frequency band is obtained based on the frequency signal extracted from one of the two third conductive members. First output means (26) for outputting, and second output means (38) for outputting second content corresponding to the second frequency band based on the frequency signal extracted from the other of the two third conductive members. Prepare.

  The first output means is supplied with the frequency signal extracted from one of the two third conductive members, and outputs the first content corresponding to the first frequency band. The second output means receives the frequency signal extracted from the other of the two third conductive members, and outputs the second content corresponding to the second frequency band.

  A radio according to the invention of claim 5 is dependent on claim 4, wherein the first content includes audio information and the second content includes positioning information.

  According to the present invention, good antenna characteristics can be obtained with a simple configuration.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  With reference to FIG. 1, the mobile communication terminal 10 of this embodiment includes a key input device 40. When a call operation for a call is performed by the key input device 40, the CPU 42 controls a CDMA (Code Division Multiple Access) signal processing circuit 20 and a CDMA radio circuit 18 to output a call signal. The output calling signal is transmitted to the mobile communication terminal of the other party through either the main antenna 12 or the auxiliary antenna 14. On the other hand, when the other party performs an incoming call operation, a call can be made.

  The voice signal input from the microphone 28 after the call is ready is amplified by the amplifier 30 and converted into voice data which is a digital signal by the AD / DA conversion circuit 22. The converted voice data is subjected to encoding processing by the CDMA signal processing circuit 20 and further subjected to modulation processing by the CDMA radio circuit 18. The modulated audio data (CDMA signal) generated by the CDMA radio circuit 18 is transmitted to the other party using either the main antenna 12 or the auxiliary antenna 14 as described above.

  On the other hand, the modulated audio data sent from the other party is received by either the main antenna 12 or the auxiliary antenna 14. The received modulated audio data is demodulated by the CDMA radio circuit 18 via the antenna connection member 16 and decoded by the CDMA signal processing circuit 20. The audio data decoded by the CDMA signal processing circuit 20 is converted into an audio signal which is an analog signal by the AD / DA conversion circuit 22, and the converted audio signal is output from the speaker 26 via the amplifier 24.

  When a call end operation is performed by the key input device 40 during a call with the other party in this way, the CPU 42 controls the CDMA signal processing circuit 20 and the CDMA radio circuit 18 to Send a call end signal to the other party. After transmitting the call end signal, the CPU 42 ends the call process. Even when a call end signal is received from the other party first, the CPU 42 ends the call process.

  When a GPS (Global Positioning System) activation operation is performed by the key input device 40, the CPU 42 activates the GPS radio circuit 32 and the GPS signal processing circuit 34. A plurality of GPS signals respectively emitted from a plurality of GPS satellites are received by either the main antenna 13 or the auxiliary antenna 14. The plurality of received GPS signals are demodulated by the GPS radio circuit 32 via the antenna connection member 16 and decoded by the GPS signal processing circuit 34.

  The GPS signal processing circuit 34 further performs a positioning calculation for determining the current position of the mobile communication terminal 10 based on the decoded GPS signals. The calculation result is given to the character generator 36, and the character generator 36 displays a map image including the current position of the mobile communication terminal 10 on the LCD 38.

  By the way, whether the modulated voice data, that is, the CDMA signal is transmitted / received through the main antenna 12 or the auxiliary antenna 14 and whether the GPS signal is received through the main antenna 12 or the auxiliary antenna 14 is determined by the state of the antenna connecting member 16. It depends on. The structures of the main antenna 12, the auxiliary antenna 14, and the antenna connection member 16 are shown in FIGS. 2 (A) and 2 (B).

  2A and 2B, the auxiliary antenna 14 is a helical antenna having an electrical length of 8.5 cm. The main antenna 12 is an extendable antenna configured to be extendable / contractable with two rod members 12a and 12b, and its electrical length is 9 cm in the state of FIG. 2 (A) and 4 in the state of FIG. 2 (B). 8 cm.

  An antenna housing hole AH is formed in the housing of the mobile communication terminal 10. In the state of FIG. 2A, all of the auxiliary antenna 14 is exposed, and most of the main antenna 12 is exposed. On the other hand, in the state of FIG. 2B, all of the auxiliary antennas 14 are exposed, and all of the main antennas 12 are accommodated in the antenna accommodation holes AH.

  The antenna connection member 16 includes a conductive member 16a provided at the lower end of the auxiliary antenna 14, a conductive member 16b provided at the upper end of the main antenna 12, a conductive member 16c provided at the lower end of the main antenna 12, the auxiliary antenna 14 and the main antenna Insulating member 16d that couples antenna 12 to each other, and conductive members 16e and 16f provided near the open end of antenna housing hole AH are included.

  That is, on the antenna side, the conductive members 16 a and 16 b are arranged so as to sandwich the insulating member 16 d that connects the auxiliary antenna 14 and the main antenna 12. The total length of the conductive member 16a, the insulating member 16d, and the conductive member 16b is substantially equal to the length of the conductive member 16c provided at the lower end of the main antenna 12. On the other hand, in the antenna housing hole AH, the conductive members 16e and 16f are arranged with an interval corresponding to the length of the insulating member 16d.

  Therefore, in the state of FIG. 2A, the main antenna 12 is connected to both the CDMA radio circuit 18 and the GPS radio circuit 32 via the conductive members 16c, 16e, and 16f. In the state of FIG. 2B, the auxiliary antenna 14 is connected to the CDMA radio circuit 18 via the conductive members 16a and 16e, and the main antenna 12 is connected to the GPS radio circuit 32 via the conductive members 16b and 16f. .

  That is, in the state of FIG. 2A, the main antenna 12 is used as a shared antenna for CDMA and GPS, and in the state of FIG. 2B, the main antenna 12 is used as a GPS-dedicated antenna, while assisting for CDMA. An antenna 14 is used.

  Here, as is well known, a frequency band of 832 MHz to 925 MHz is used for data communication according to the CDMA system. When the frequency of the CDMA signal is 880 MHz, the wavelength λ1 is calculated to be about 0.34 m by dividing the speed of light by the frequency. On the other hand, since 1575 MHz is used for GPS, the wavelength λ2 of the GPS signal is about 0.19 m.

  In general, when the electrical length of the antenna is an integral multiple of “λ / 2” with respect to the wavelength λ of the signal, resonance occurs in the antenna, thereby obtaining good characteristics. However, when the antenna is connected to the ground, an image antenna is formed, and thus resonates at “λ / 4”.

  In the extended state, the main antenna 12 is suitable for both a CDMA signal and a GPS signal because its electrical length (= 9 cm) is about a quarter of the wavelength λ1 and about a half of the wavelength λ2. In the contracted state, the electrical length (= 4.8 cm) is a quarter of the wavelength λ2, which is suitable for the GPS signal. On the other hand, the auxiliary antenna 14 is suitable for a CDMA signal because the electrical length (= 8.5 cm) is ¼ of the wavelength λ1.

  Specifically, the impedance characteristic of the main antenna 12 draws the waveform shown in FIG. 3A in the extended state of FIG. 2A, and draws the waveform shown in FIG. 3B in the shortened state of FIG. . Referring to FIG. 3A, VSWR (Voltage Standing Wave Ratio) belongs to the range of “2” to “4” in the CDMA frequency band (832 MHz to 925 MHz; the same applies below), and the GPS frequency (1575 MHz; In the same manner, "3" is indicated. From this, it can be seen that the extended main antenna 12 resonates in both the CDMA frequency band and the GPS frequency.

  Referring to FIG. 3B, VSWR belongs to “17” to “19” in the CDMA frequency band, but generally indicates “2” in the GPS frequency. From this, it can be seen that the shortened main antenna 12 resonates at the GPS frequency but does not resonate at the CDMA frequency band.

  On the other hand, the impedance characteristic of the auxiliary antenna 14 draws the waveform shown in FIG. Referring to FIG. 4, VSWR belongs to a range of “1” to “3” in the CDMA frequency band, but generally indicates “7” in the GPS frequency. From this, it can be seen that the auxiliary antenna 14 resonates in the CDMA frequency band but does not sufficiently resonate at the GPS frequency.

  As is apparent from the above, in this embodiment, the main antenna 12 is taken out of the storage hole AH in the extended state and stored in the storage hole AH in the shortened state. The length in the stretched state is suitable for both the CDMA frequency band and the GPS frequency band, and the length in the shortened state is suitable for the GPS frequency band. The auxiliary antenna 14 is connected to the main antenna 12 via an insulating member 16d. The length of the auxiliary antenna 14 is suitable for the CDMA frequency band.

  A conductive member 16 b is provided at the apex end of the main antenna 12, and a conductive member 16 c is provided at the base end of the main antenna 12. The auxiliary antenna 14 is provided with a conductive member 16a. On the other hand, conductive members 16e and 16f are provided in the vicinity of the storage hole AH along the length direction of the storage hole AH. Here, the conductive member 16c has a length straddling the conductive members 16e and 16f, and the interval between the conductive members 16a and 16b corresponds to the interval between the conductive members 16e and 16f.

  As a result, when the main antenna 12 is in the extended state, the conductive member 16c is connected to each of the two conductive members 16e and 16f. When the main antenna 12 is in the shortened state, the conductive members 16a and 16b are connected to the conductive member 16e and 16f is connected to each.

  Therefore, the CDMA signal and the GPS signal belonging to the CDMA frequency band and the GPS frequency band, respectively, are captured by the main antenna 12 in the expanded state, and are respectively captured by the auxiliary antenna 14 and the main antenna 12 in the shortened state. The captured CDMA signal and GPS signal are extracted from the conductive members 16e and 16f, respectively, and supplied to the CDMA radio circuit 18 and the GPS radio circuit 32, respectively.

  Thus, the length of the main antenna 12 and the connection relationship between the two conductive members 16e and 16f are switched between the extended state and the shortened state. As a result, good antenna characteristics can be obtained for both the CDMA and GPS frequency bands in each of the expanded state and the shortened state.

  In the above description, the portable terminal 10 sharing the CDMA frequency band and the GPS frequency band has been described. However, the present invention can be applied to a radio device sharing two different frequency bands.

It is a block diagram which shows the structure of one Example of this invention. (A) is an illustration figure which shows the non-housing state of the main antenna, auxiliary antenna, and antenna connection member which are applied to FIG. 1 embodiment, (B) is the main antenna, auxiliary antenna and It is an illustration figure which shows the accommodation state of an antenna connection member. (A) is a graph which shows the impedance characteristic of the main antenna in the state of FIG. 2 (A), (B) is a graph which shows the impedance characteristic of the main antenna in the state of FIG. 2 (B). It is a graph which shows the impedance characteristic of the auxiliary antenna in a FIG. 2 (A) state or a FIG. 2 (B) state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Mobile communication terminal 12 ... Main antenna 14 ... Auxiliary antenna 16 ... Antenna connection member 16a, 16b, 16c, 16e, 16f ... Conductive member 16d ... Insulating member 18 ... CDMA radio circuit 20 ... CDMA signal processing circuit 32 ... GPS radio circuit 34 ... GPS signal processing circuit 42 ... CPU
AH ... Antenna housing hole

Claims (5)

In a stretched state as a length suitable for both the first frequency band and second frequency band is taken out from the antenna NaOsamu paid portion, a is accommodated in the antenna accommodating portion in a shortened state of the length suitable for the second frequency band 1 antenna,
A second antenna coupled to the first antenna via an insulating member and having a length suitable for the first frequency band;
Two first conductive members provided on the first antenna;
One second conductive member provided in the second antenna, and two third conductive members provided in the vicinity of the antenna storage portion,
One of the two first conductive members is connected to each of the two third conductive members when the first antenna is in the extended state, and the two first conductive members are connected when the first antenna is in the shortened state. And the one second conductive member are connected to the two third conductive members, respectively. One of the two first conductive members is provided at the base side end of the first antenna,
The wireless device according to claim 1, wherein the other of the two first conductive members is provided at an apex side end of the first antenna. The two third conductive members are arranged along the length direction of the antenna housing portion,
One of the two first conductive members has a length straddling the two third conductive members,
The wireless device according to claim 1 or 2, wherein an interval between the other of the two first conductive members and the one second conductive member corresponds to an interval between the two third conductive members. First output means for outputting first content corresponding to the first frequency band based on a frequency signal extracted from one of the two third conductive members, and extracted from the other of the two third conductive members 4. The wireless device according to claim 1, further comprising second output means for outputting second content corresponding to the second frequency band based on the received frequency signal. 5.   The wireless device according to claim 4, wherein the first content includes audio information, and the second content includes positioning information.

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