JP2006174219A - Antenna device and portable radio unit using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna device that uses a single antenna element and is adaptive to different systems using a plurality of frequencies, and portable radio unit using the same. <P>SOLUTION: The antenna device includes the antenna element 10, a first radio circuit section 12 corresponding to a first frequency and system and a second radio circuit section 13 corresponding to a second frequency and system, the antenna device also includes a control circuit section 11 in which the antenna element 10 and the first and second radio circuit sections 12, 13 are connected, and the control circuit section 11 is provided with a matching means for matching frequency bands of control signals 14 from the first and second radio circuit sections 12, 13, and a switching means for switching a reception route. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a portable wireless device used for mobile communication and the like and an antenna device mounted thereon, and more particularly to an antenna device using a plurality of frequencies and systems.

  A mobile phone, which is a representative example of a portable radio device used for mobile communication, is not only equipped with a function as a conventional phone but is also being loaded with a system corresponding to various applications.

  Examples include FM radio, television, GPS, Bluetooth, and WLAN.

  However, since these systems use different frequencies and radio circuits, antenna elements corresponding to each system are required.

  A conventional antenna device is shown in FIG.

  As shown in FIG. 5, the conventional antenna device corresponding to a plurality of frequencies includes a first radio circuit unit 102 corresponding to the first frequency and the system, and a second radio corresponding to the second frequency and the system. The first radio circuit unit 102 corresponds to the first antenna element 100 corresponding to the first frequency and the system, and the second radio circuit unit 103 corresponds to the second frequency and the system. Connected to the second antenna element 101.

  Conventionally, as shown in FIG. 5, when a plurality of systems such as first and second frequencies and a plurality of systems such as first and second systems are used, a plurality of antenna elements 100 and 101 corresponding to the respective systems are used. Had to be used.

As a prior art document related to the invention of this application, for example, Patent Document 1 is known.
Japanese Patent Application Laid-Open No. 2002-237779

  However, when a plurality of antenna elements are arranged, not only a space for arranging the antenna elements is required, but also problems such as deterioration of characteristics due to the coupling between elements and difficulty in adjusting the element alone due to the coupling arise.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and aims to cope with different systems using a plurality of frequencies by using one antenna element.

  To achieve this object, the present invention includes an antenna element, a first radio circuit unit corresponding to the first frequency and the system, and a second radio circuit unit corresponding to the second frequency and the system. The antenna device includes a control circuit unit that connects the antenna element and the first and second radio circuit units, and the control circuit unit is connected to the first and second radio circuit units. An antenna apparatus comprising: matching means for matching a frequency band of a control signal; and switching means for switching a reception path, wherein control signals from the first and second radio circuit units are provided. Thus, it is possible to cope with different systems using a plurality of frequencies by using one antenna element by switching the matching condition for matching the frequency band in the control circuit unit and the reception path.

  The antenna device and the portable wireless device of the present invention use a single antenna element to switch a plurality of frequencies by switching the control signal from the first and second radio circuit units in the matching condition and the reception path. It becomes possible to cope with different systems using the.

(Embodiment 1)
Hereinafter, the first and second aspects of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing an antenna apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the antenna device of the present embodiment includes a first frequency-free circuit unit 12 corresponding to the first frequency and the system, and a second radio circuit unit 13 corresponding to the second frequency and the system. The first and second radio circuit units 12 and 13 are connected to the control circuit unit 11 and are connected to the antenna element 10 from the control circuit unit 11.

  The connection circuit unit 11 includes a matching unit for matching the frequency band of the control signal 14 transmitted from the first and second radio circuit units 12 and 13 and a switching unit for switching the reception path.

  Thereby, it is possible to cope with different systems using a plurality of frequencies with one antenna element.

  FIG. 2 is a block diagram showing a more specific configuration example of the antenna device according to Embodiment 1 of the present invention. Descriptions of the same reference numerals as those in FIG. 1 are omitted.

  In FIG. 2, a GPS radio circuit unit 15 used as the first system and a Bluetooth or WLAN radio circuit unit 16 used as the second system are connected to the control circuit unit 11, respectively. As an example, the switching unit 17 is a semiconductor SPDT (Single Pole Double Throw) switch and the matching unit 18 is an inductance.

  The antenna element 10 is in a state of being matched to the Bluetooth or WLAN frequency band of 2.4 GHz. When the semiconductor SPDT switch 17 is inserted into the Bluetooth or WLAN wireless circuit section 16 side by the control signal 14, It becomes an antenna element corresponding to a frequency of .4 GHz band, and communication is possible.

  When the switch 17 is inserted into the GPS radio circuit unit 15 side, the antenna element 10 can be matched to a low frequency of 1.5 GHz band which is a GPS frequency band by the inductance 18 which is a matching means, and communication can be performed. It becomes possible.

(Embodiment 2)
Hereinafter, the second to seventh aspects of the present invention will be described with reference to the drawings.

  FIG. 3 is a block diagram showing an antenna apparatus according to Embodiment 2 of the present invention.

  As shown in FIG. 3, the antenna device of the present embodiment includes a first radio circuit unit 12 corresponding to the first frequency and the system, and a second radio circuit unit 13 corresponding to the second frequency and the system. And a third radio circuit unit 19 corresponding to the third frequency and the system, and these first, second, and third radio circuit units 12, 13, and 19 are connected to the control circuit unit 11 and controlled. The circuit unit 11 is connected to the antenna element 10.

  The control circuit unit 11 includes a matching unit for matching the frequency band of the control signal 14 transmitted from the first, second, and third radio circuit units 12, 13, and 19, and a switching unit for switching the reception path. It has.

  According to the 14 control signals, the path and the matching condition are switched by the 11 control circuit units, and a single antenna element 10 can be used to correspond to a plurality of radio circuits 12, 13, and 19.

  With the above configuration, it is possible to deal with different systems using a plurality of frequencies with one antenna element.

  FIG. 4 is a block diagram showing a more specific configuration example of the antenna device according to Embodiment 2 of the present invention. Descriptions of the same reference numerals as those in FIG. 3 are omitted.

  In FIG. 4, the GPS radio circuit unit 15 used as the first system, the Bluetooth or WLAN radio circuit unit 20 used as the second system, and the WLAN radio circuit unit 21 corresponding to the third system are: For example, the control circuit unit 11 is connected to the control circuit unit 11. The control circuit unit 11 includes, for example, a switching unit 22 that is a semiconductor SP3T switch that switches three paths, and a capacitance 23 that is a first matching unit that matches the Bluetooth wireless circuit unit. And a capacitance 24 as a second matching means for matching the WLAN circuit section.

  The antenna element 10 is matched to the 1.5 GHz band which is a GPS frequency band. When the SP3T switch 22 is inserted into the GPS wireless circuit unit 15 side by the control signal 14, communication in the GPS frequency band is possible.

  When the switch 22 is inserted into the Bluetooth radio circuit unit 20 side, the antenna 23 is matched to a frequency of 2.4 GHz band by the capacitance 23 which is the matching means 1, and communication in the Bluetooth frequency band becomes possible.

  Similarly, when the switch 22 is inserted into the WLAN radio circuit unit 21, the antenna element 10 is matched to a frequency in the 2.4 GHz band by the capacitance 24 serving as the matching means 2, and communication in the WLAN frequency band is possible.

  In this embodiment, the case of GPS, Bluetooth, and WLAN is exemplified as a specific system. However, the configuration of the present invention can be applied to other systems such as FM radio and television systems. .

  Further, in the present embodiment, the case where a maximum of three types of systems are supported is illustrated, but the present invention can be similarly applied to four or more types of systems.

  As described above, the present invention provides an antenna device and a radio communication apparatus that use a single antenna element and that correspond to a plurality of frequencies and systems, and in particular, a small mobile phone that uses a plurality of applications as a system. Etc. are useful.

The block diagram which shows the antenna apparatus in Embodiment 1 of this invention The block diagram which shows the specific structure of the antenna apparatus in Embodiment 1 of this invention. The block diagram which shows the antenna apparatus in Embodiment 2 of this invention The block diagram which shows the specific structure of the antenna apparatus in Embodiment 2 of this invention. Block diagram showing a conventional antenna device

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Antenna element 11 Control circuit part 12 1st radio | wireless circuit part 13 2nd radio | wireless circuit part 14 Control signal

Claims (7)

An antenna device comprising: an antenna element; a first radio circuit unit corresponding to a first frequency and a system; and a second radio circuit unit corresponding to a second frequency and a system. And a second radio circuit unit, and the control circuit unit is a matching unit for matching frequency bands of control signals from the first and second radio circuit units. And a switching means for switching the reception path. The antenna apparatus according to claim 1, wherein the first frequency and system correspond to GPS (Global Positioning System), and the second frequency and system correspond to Bluetooth or WLAN (Wireless Local Area Network). An antenna element; a first radio circuit unit corresponding to the first frequency and system; a second radio circuit unit corresponding to the second frequency and system; and a third radio circuit unit corresponding to the third frequency and system. An antenna device having a radio circuit unit includes a control circuit unit that connects the antenna element and the first, second, and third radio circuit units, and the control circuit unit includes the first and second radio circuit units. An antenna apparatus comprising: matching means for matching frequency bands of control signals from the second and third radio circuit units; and switching means for switching reception paths. 4. The antenna apparatus according to claim 3, wherein the first frequency and system correspond to GPS, the second frequency and system correspond to Bluetooth, and the third frequency and system correspond to WLAN. The antenna device according to claim 1 or 3, wherein the switching means of the control circuit unit is constituted by a semiconductor switch. The antenna device according to claim 1 or 3, wherein the matching means of the control circuit unit is configured by an inductance and a capacitance. A portable radio using the antenna device according to claim 1.

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