JP3443299B2 - Portable wireless communication device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio communication device which enables communication based on a plurality of communication systems. 2. Description of the Related Art Conventionally, as a communication system, 189
PHS (Personal Handyphone System) using a frequency band of 5.15 MHz to 1917.95 MHz, and 81
PDC (Personal Digital Cellular TeleCommuni) using a frequency band of 0.025 MHz to 957.975 MHz
cation system) and many other systems, and a dedicated portable wireless terminal was assigned to each communication system.
As described in JP-A-9-9348 and JP-A-9-163450, communication by these plural communication systems is enabled, and a desired communication system is selected from the plural communication systems to perform communication. Was proposed. [0003] However, as in the above-described conventional apparatus, it is possible to perform communication using a plurality of communication methods and select a desired communication method from among the plurality of communication methods to perform communication. Since the frequency band used differs depending on the communication system, it is necessary to use an antenna that covers all the frequency bands, and even if such an antenna is used, the noise increases. There was a problem that communication could not be performed smoothly. [0004] It is an object of the present invention to provide a portable radio communication device which enables communication by a plurality of communication methods without increasing noise or the like. [0005] To achieve the above object, according to an aspect of the present invention, in a portable radio communication apparatus for performing communication based on the communication system frequency band and the signal format is defined, the first A first communication circuit that performs communication based on the communication method, a second communication circuit that performs communication based on the second communication method, and monitors signals from base stations corresponding to the first and second communication methods. While performing intermittent reception, when an incoming signal received in this intermittent reception state is processed by the first communication circuit, the length of the antenna is set to a length matching the wavelength of the frequency of the first communication circuit; When the incoming signal received in the intermittent reception state is processed by the second communication circuit,
Control means for setting the length of the antenna to a length suitable for the wavelength of the frequency of the second communication circuit. [0006] Therefore, according to the present invention, to automatically adjust the length of the antenna based on the communication method that is selected using,
The length of the antenna can be adjusted according to the wavelength of the frequency. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic functional block diagram showing an electric configuration of a portable radio communication apparatus according to an embodiment of the present invention, FIG. 2 is an explanatory view showing an appearance of the portable radio communication apparatus, and FIG. FIG. 4 is a flowchart illustrating an example of operation control at the time of automatic antenna adjustment in the wireless communication device, FIG. 4 is a flowchart illustrating another example of operation control at the time of automatic antenna adjustment in the portable wireless communication device, and FIG. 13 is a flowchart illustrating still another example of operation control during automatic antenna adjustment. 1 and 2, reference numeral 1 denotes an extendable antenna, 2 denotes an automatic antenna expansion / contraction circuit that expands / contracts the antenna 1, and 3 denotes 1895.15 MHz to 1917.95M.
The PHS circuit communicates using a frequency band of predetermined frequency and a predetermined signal format.
A PDC circuit that performs communication using a 975 MHz frequency band and a predetermined signal format, 5 is another circuit that performs communication using another communication method, 6 is a PHS circuit 3 and a PDC
An LCD driving circuit that performs driving for performing various displays based on signals from the circuit 4 and other circuits 5, an LCD 7 that performs various displays based on signals from the LCD driving circuit 6,
Is an incoming call detection circuit that detects whether or not an incoming call is received based on signals from the PHS circuit 3 and the PDC circuit 4 and other circuits 5, 9 is a KEY for instructing start and end of communication, inputting a telephone number, and the like. Reference numeral 10 denotes a control unit that controls expansion / contraction operation in the auto antenna expansion / contraction circuit 2 based on signals from the PHS circuit 3, the PDC circuit 4, the other circuit 5, the incoming call detection circuit 8, and the KEY 9. First, an example of the operation of the portable radio communication apparatus configured as described above during automatic antenna adjustment will be described with reference to the flowchart shown in FIG. The portable radio communication apparatus performs intermittent reception for monitoring a signal from a base station (not shown) during a call standby (step S1). When the PHS circuit 3 is synchronized in the intermittent reception state (step S2), the control unit 10 controls the auto antenna expansion / contraction circuit 3 based on the signal from the PHS circuit 3 to control the length of the antenna 1. When the PDC circuit 4 is synchronized in the intermittent reception state (step S2), the control unit 10 controls the automatic antenna expansion / contraction circuit 3 based on the signal from the PDC circuit 4 (step S3). Control to make the length of the antenna 1 160 mm (step S4),
Further, when synchronization is established in the other circuit 5 in the intermittent reception state (step S2), the control unit 10 controls the auto antenna expansion / contraction circuit 3 based on a signal from the other circuit 5 to reduce the length of the antenna 1. In addition, the length is set to (1 / 2λ) that matches the wavelength of the frequency of the circuit 5 (step S
5). Therefore, according to the above operation control, the length of the antenna 1 can be automatically adjusted to match the wavelength of the frequency of the usable communication system. Next, another example of the operation at the time of automatic antenna adjustment will be described with reference to the flowchart shown in FIG. The portable radio communication apparatus performs intermittent reception for monitoring a signal from a base station (not shown) during a call standby (step S11). Then, in this intermittent reception state, the incoming signal transmitted from the base station is received and the PH
If the processing is performed in the S circuit 3 (step S12), the LCD drive circuit 6 displays a message notifying that the call has been received by the PHS on the LCD 7 based on the signal from the PHS circuit 3 (step S13). When the incoming signal received in the receiving state is processed by the PDC circuit 4 (step S12), the LCD drive circuit 6 sends a signal to the LCD 7 based on the signal from the PDC circuit 4.
A message notifying that the incoming call has been received by the DC is displayed (step S13), and when the incoming signal received in the intermittent reception state is processed in the other circuit 5 (step S12), the LCD drive circuit 6 is switched to the other circuit. A message notifying that the call has been received by other communication methods is displayed on the LCD 7 based on the signal from the terminal 5 (step S13). On the other hand, if it is determined based on the message displayed on the LCD 7 that the incoming communication system is PHS (step S14), the control unit 10 controls the automatic antenna expansion / contraction circuit 3 to control the antenna 1 The length is set to 80 mm (step S15), and if it is determined that the PDC is a PDC (step S14), the automatic antenna expansion / contraction circuit 3
To make the length of the antenna 1 160 mm (step S16), and if it is determined that the communication method is another (step S14), the automatic antenna expansion / contraction circuit 3
To make the length of the antenna 1 a length (1 / 2λ) that matches the wavelength of the frequency of the other circuit 5 (step S1).
7). Therefore, according to the above operation control, the length of the antenna 1 can be automatically adjusted to match the wavelength of the frequency of the communication system in which the incoming call is made. Next, still another example of the operation at the time of the automatic antenna adjustment will be described with reference to the flowchart shown in FIG. The portable radio communication device performs intermittent reception for monitoring a signal from a base station (not shown) during a call standby (step S21). Then, in this intermittent reception state, when the user operates the KEY 9 to issue a transmission instruction (step S22), the control unit 10 determines based on the electric field strength from the base station corresponding to each communication system, the moving speed of the user, and the like. To recognize the optimal communication method for communication (step S23),
The D drive circuit 6 displays the communication method (step S2).
At the same time, when it is determined that the recognized communication system is PHS (step S25), the length of the antenna 1 is controlled to 80 mm by controlling the automatic antenna expansion / contraction circuit 3 (step S26), and the PDC is used. If it is determined that there is an antenna (step S25), the length of the antenna 1 is set to 160 mm by controlling the automatic antenna expansion / contraction circuit 3 (step S27), and if it is determined that the communication method is another (step S25). In step S28, the length of the antenna 1 is set to a length (1 / 2λ) that matches the wavelength of the frequency of the other circuit 5 by controlling the automatic antenna expansion / contraction circuit 3. Therefore, according to the above operation control, it is possible to automatically select an optimum communication system at the time of transmission, and to automatically adjust the length of the antenna 1 to match the wavelength of the frequency of the communication system. it can. In the above operation control, the most suitable communication system at the time of calling is automatically selected based on the electric field strength from the base station, the moving speed of the user, and the like according to each communication system. Although the length of the antenna 1 is automatically adjusted according to the method, the present invention is not limited to this. For example, the communication method is manually selected by operating the KEY 9 by the user, and the manually selected communication method is set. The length of the antenna 1 may be automatically adjusted accordingly. Further, in the above embodiment, a monopole antenna is used as the antenna 1, and the PHS is used for 80 m.
m and 160 mm when using a PDC, but the present invention is not limited to this, and other types of antennas may be used. In that case, the length of the antenna may be PHS or PDC depending on the material and type of the antenna. May be adjusted to match the wavelength of the frequency. As described above, according to the present invention, the antenna length is automatically adjusted based on the communication system in use, and the antenna is adjusted to a length corresponding to the frequency wavelength. Therefore, communication using a plurality of communication methods can be performed without increasing noise or the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic functional block diagram showing an electrical configuration of a portable wireless communication device according to an embodiment of the present invention. FIG. 2 is an explanatory diagram showing an appearance of the portable wireless communication device. FIG. 3 is a flowchart showing an example of operation control during automatic antenna adjustment in the portable wireless communication device. FIG. 4 is a flowchart showing another example of operation control at the time of automatic antenna adjustment in the portable wireless communication device. FIG. 5 is a flowchart showing still another example of operation control at the time of automatic antenna adjustment in the portable wireless communication device. [Description of Signs] 1 Antenna 2 Auto antenna expansion / contraction circuit 3 PHS circuit 4 PDC circuit 5 Other circuits 6 LCD driving circuit 7 LCD 8 Incoming detection circuit 9 KEY 10 Control unit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 1/38-1/58 H04B 1/18 H01Q 1/10

Claims (1)

(57) In the Claims 1. A portable radio communication apparatus for communicating based on a communication system frequency band and the signal format is defined, first performing communication based on the first communication scheme A communication circuit, a second communication circuit for performing communication based on the second communication method, and intermittent reception for monitoring signals from base stations corresponding to the first and second communication methods, When the incoming signal received at step (1) is processed by the first communication circuit, the length of the antenna is set to a length corresponding to the wavelength of the frequency of the first communication circuit, and the incoming signal is received in the intermittent reception state. A portable wireless communication device, further comprising: control means for setting a length of an antenna to a length corresponding to a wavelength of a frequency of the second communication circuit when a signal is processed in the second communication circuit.