JPH1188223A - Card-type radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain sufficient antenna gain corresponding to kinds of using conditions by providing first and second antennas, switching the antennas according to a using condition and executing radio communication through the switched antenna. SOLUTION: A switch circuit part 31 switches with respect to loop antennas 5, 6 and a loop antenna 10. A radio part 32 modulate/demodulate-processes information to radio-communicate by using an antenna selected by switching processing. An insertion judging part 33 detects that a card-type radio equipment is inserted to a slot to be connected with a personal computer, by using a mechanical or electrical sensor. A control part 34 executes information input/ output control between a radio part 32 and a personal computer, antenna switch control based on a detection signal from the part 33. An antenna suited to a portable communication equipment and a radio modem is previously set to switch use the antenna according to the using condition of the card-type radio equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention functions as a wireless device such as a pager when used in a portable manner, and functions as a wireless modem when used in connection with an information processing device such as a personal computer. In particular, the present invention relates to a card-type wireless device in which the gain characteristics of an antenna are improved in accordance with the state of use.

[0002]

2. Description of the Related Art Card-type radios have been widely used as pagers in the past, but with the diversification of information processing devices such as personal computers and the development of information communication networks, card-type radios have been increasingly used as wireless LANs. As a component, it is also used as a wireless modem for performing bidirectional data communication. That is, the card-type wireless device is configured as a compound wireless device that combines a pager function and a wireless modem function, and is used as a pager when a user carries the card-type wireless device alone. When connected to a card slot of a personal computer, it is used as a wireless modem for performing various data communications.

A means for connecting a personal computer to an information communication network has conventionally been a PC.
Modem cards conforming to the MCIA standard are known.
By inserting this modem card into a card slot of a personal computer, the personal computer is connected to an information communication network via a communication line or the like.

[0004]

Here, in a conventional card type radio used only as a radio modem,
Although a magnetic field sensitive antenna such as a loop antenna may be used in some cases, an electric field sensitive antenna such as a monopole antenna is often used. On the other hand, in a conventional card-type wireless device used only as a pager, a flat-type loop antenna or the like is used so that a good antenna gain characteristic can be obtained when the user carries the wireless device or installs it in free space. A magnetic field sensitive antenna is used.

[0005] However, when the card-type wireless device has the complex function as described above, if one of the magnetic field-sensitive antenna and the electric field-sensitive antenna is used, the installation situation such as the antenna arrangement and the card-type antenna are not considered. There is a problem that a sufficient antenna gain characteristic (radiation efficiency) cannot be obtained depending on the use condition of the wireless device. For example, in the case of a compound card-type wireless device using a monopole antenna, a good antenna gain can be obtained when inserted into a personal computer and used as a wireless modem. When used as a pager, the antenna gain is extremely reduced. Also, in the case of a compound card type radio using a flat loop antenna, a good antenna gain can be obtained when used as a pager, but when used as a wireless modem, the antenna inside the card slot can be obtained. For example, the loop antenna is covered, and the antenna gain is extremely reduced.

The present invention has been made in view of the above circumstances, and has as its object to provide a composite card-type radio device capable of obtaining a sufficient antenna gain in various use situations. .

[0007]

In order to achieve the above object, a card-type wireless device according to the present invention is used as a wireless modem by being connected to an information processing device.
A card-type wireless device used as a portable wireless device by being carried alone, comprising a first antenna set for a wireless modem and a second antenna set for a mobile wireless device, and a card-type wireless device. The switching circuit switches the antenna used for wireless communication in accordance with the antenna switching signal output from the control circuit in accordance with the usage state of the wireless device, and the wireless circuit performs wireless communication via the switched antenna.

That is, depending on whether the antenna is used as a wireless modem connected to a personal computer or as a portable wireless device such as a pager, an antenna suitable for the usage is used for wireless communication. ,
A sufficient antenna gain can be obtained in accordance with the use situation.

Further, the card-type radio device according to the present invention has an electric field intensity detection circuit for detecting the electric field intensity of a signal received from an antenna in order to grasp the above-mentioned use situation, and the control circuit has an electric field intensity detection circuit. An antenna switching signal is output based on the electric field intensity signal from the intensity detection circuit, and the antenna used for wireless communication is switched to improve the electric field intensity. In addition, the card-type wireless device according to the present invention includes a connection determination circuit such as an input signal detection circuit or a sensor for detecting a state in which the card-type wireless device is connected to the information processing device in order to grasp the above-mentioned use situation. The control circuit outputs an antenna switching signal based on the connection detection signal from the connection determination circuit,
The first antenna is switched to an antenna used for wireless communication. In addition, the card-type wireless device according to the present invention has a changeover switch for receiving an antenna changeover instruction from a user in order to grasp the above-mentioned use situation, and the control circuit is configured to perform control based on the changeover instruction from the changeover switch. An antenna switching signal is output, and the antenna selected by the user is switched to an antenna used for wireless communication.

[0010] In addition, the card type radio according to the present invention includes an electric field intensity detection circuit for detecting the electric field intensity of a signal received from an antenna, and a card type radio for information processing. A connection determination circuit that detects a state of being connected to the control circuit, and the control circuit, based on the connection detection signal, of the connection detection signal from the connection determination circuit and the electric field strength signal from the electric field strength detection circuit. And outputs an antenna switching signal to switch the first antenna to an antenna used for wireless communication. In other words, giving priority to the actual use situation of connecting the card-type wireless device to the information processing device,
Wireless communication is performed with an antenna suitable for the use situation, and a good antenna gain is reliably realized.

The card type radio device according to the present invention includes an electric field intensity detection circuit for detecting the electric field intensity of a signal received from an antenna, and a card type radio device for ascertaining the above use situation. And a switch for receiving an antenna switching instruction from a user. The control circuit includes a connection detection signal from the connection determination circuit and an electric field from the electric field strength detection circuit. An antenna switching signal is output based on the antenna switching instruction of the intensity signal and the antenna switching instruction from the switching switch, and the antenna selected by the user is switched to the antenna used for wireless communication. That is, by giving priority to the judgment of the user who is actually using the card-type wireless device, wireless communication is performed with an antenna according to the judgment of the user, and a good antenna gain is reliably realized.

Further, in the card type radio according to the present invention, the first antenna used when used as a radio modem includes:
A card-type wireless device is inserted into a connection slot of a personal computer as an information processing device and is connected to the card-type wireless device. This allows the first antenna to be located outside the device without being covered by the slot, so that the radio wave can be satisfactorily communicated. Further, in the card-type radio device according to the present invention, the first antenna and the second antenna are provided with their polarization planes crossing each other. As a result, even if the attitude (that is, the direction) of the card-type wireless device changes in various use situations, a good antenna gain can be obtained by any of the antennas.

The card-type radio device according to the present invention is characterized in that the first antenna is an electric field-sensitive antenna which has been frequently used for a radio modem, and the second antenna is suitable for a pager or the like. The antenna is a magnetic field sensitive type antenna used by the company. Here, assuming the actual use situation of the card-type wireless device, the use situation as the pager can be considered in various aspects than the use situation as the wireless modem, and various severe situations that deteriorate the antenna characteristics are assumed. Is done. Therefore, in the card-type radio device according to the present invention, for example, when the installation states of the first antenna and the second antenna are different from each other as described above, it is possible to use both antennas as the same type of antenna. Therefore, in the first embodiment of the present invention described later, both antennas are magnetic field-sensitive antennas with priority given to the usage status as a pager.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a card-type radio according to the present invention will be described with reference to the drawings. FIG. 1 shows the first embodiment of the present invention.
2 shows a state in which the card-type wireless device according to the embodiment is used as a wireless modem. FIG. 2 shows a perspective view of the card-type wireless device according to the first embodiment of the present invention, FIG. 3 shows a perspective view of the card-type wireless device, and FIG. The appearance is shown. This card type radio 1
Functions as a wireless LAN as a component of the wireless LAN when connected to the personal computer 20, and functions as a pager when carried alone. Although not shown, the card-type radio 1 has a built-in battery for power supply.

The card-type radio 1 comprises a front end 2 having a thin flat outer shape conforming to the PCMCIA standard, and a rear end 3 having a flat shape thicker than the front end 2. A personal computer 20 to which the card-type wireless device 1 is connected is provided with a card insertion slot 21 compliant with the PCMCIA standard. 20. A connector 4 is provided on the distal end surface of the distal end portion 2. When the distal end portion 2 is inserted into the slot 21, the connector 4 is connected to the internal interface bus of the personal computer 20 and the card type radio 1 is connected to the personal computer 20.

Here, even when the card type radio 1 is connected to the personal computer 20, the rear end 3 protrudes out of the slot 21, and only the tip 2 of the card type radio 1 is in the slot 21. It is in the state stored in. A pair of metal plates 5 and 6 are attached to the upper surface and the lower surface of the distal end portion 2 of the card-type wireless device 1, and the pair of metal plates 5 and 6 constitute a flat loop antenna set for a pager. In addition, the housing of the card type radio 1 is also configured. As shown in FIG. 4, a printed wiring board 7 is housed inside the card-type radio 1, and on the printed wiring board 7, circuit elements 8, 9 constituting various functional circuits described later are provided. And so on. A linear loop antenna 10 is attached to the end of the printed wiring board 7 (the rear end 3 of the card-type radio), and this loop antenna 10 constitutes an antenna set for a wireless modem. doing.

With the above configuration, the linear loop antenna 10 and the planar loop antennas 5 and 6 are arranged so that their polarization planes are orthogonal to each other, and the linear loop antenna 10 used for a wireless modem is provided. Indicates that the card-type wireless device 1 projects outside the slot 21 even when it is connected to the personal computer 20. Also,
The card-type wireless device 1 is provided with an antenna changeover switch 11, and when the user operates the switch 11, the planar loop antennas 5 and 6 and the linear loop antennas are used as antennas used for wireless communication. 10 can be selected.

FIG. 5 shows a perspective view of a card-type wireless device according to a second embodiment of the present invention. This card-type radio 12 uses a monopole antenna 13 as an antenna set for a radio modem, instead of the above-described linear loop antenna 10, and the monopole antenna 13 has a card at its base end. End 3 of the type radio 12
Is provided rotatably. Therefore, the monopole antenna 13 can be set in a state of standing upright from the card-type radio and in a folded state substantially flush with the card-type radio, and connecting the card-type radio 12 to the personal computer 20. In this state, the slot 21 projects outside the slot 21. Further, similarly to the first embodiment, the monopole antenna 13 is arranged so that the planes of polarization of the monopole antenna 13 and the planar loop antennas 5 and 6 are orthogonal to each other. Other configurations of the card type radio 12 are the same as those of the card type radio 1 of the first embodiment.

Next, the internal structure and processing operation of the card-type radio 1 of the first embodiment will be described. FIG. 6 shows an internal configuration according to a first example of the card-type wireless device. In the figure, 31 is a switching circuit unit for switching between the loop antennas 5 and 6 and the loop antenna 10, 32 is a wireless unit for modulating or demodulating information for performing wireless communication using the antenna selected by the switching process, 33 Is an insertion determination unit that detects that the card-type wireless device 1 has been inserted into the slot 21 and connected to the personal computer 20 by using a mechanical or electrical sensor, and 34 is between the wireless unit 32 and the personal computer 20. And a control unit for performing antenna switching control based on a detection signal from the insertion determination unit 33 and the like.

According to the configuration shown in FIG. 6, when the card-type radio 1 is inserted into the slot 21 and the connector 4 is connected to the bus interface of the personal computer 20, this connection state is detected by the insertion determination unit 33, and the connection is detected. The signal 35 is output to the control unit 34. When receiving the connection detection signal 35, the control unit 34 outputs an antenna switching signal 36 preset in the ROM to the switching circuit unit 31, and the switching circuit unit 31 switches the antenna on the communication path according to the switching signal 36. Set the antenna used for wireless communication.

Here, in this example and each of the examples shown in FIGS. 7 to 9, when the card type radio 1 is connected to the personal computer 20, the linear loop antenna 10 is used for radio communication, and the card type radio is used. 1 is a personal computer 2
In a state where it is not connected to 0 (a state where it is carried as a pager), the antennas are switched and the planar loop antennas 5 and 6 are used for wireless communication. In addition, how to switch and select the antenna by such a switching process can be arbitrarily set. However, in a state where the antenna is connected to the personal computer 20, a format and a position suitable for a wireless modem are set in advance. Linear loop antenna 1
The antenna is selected in a mode including at least 0, and
It is preferable to select an antenna in a state including at least the plate-shaped loop antennas 5 and 6 preset in a form and position suitable for the pager when being carried as a pager.

When an antenna used for wireless communication is selected as described above, information wirelessly transmitted from an external wireless LAN is received by the wireless unit 32 via the antenna 10, and the received information 37 is transmitted to the control unit 34. The data is output to the bus interface of the personal computer 20 via the personal computer 20. The information 37 transmitted from the bus interface of the personal computer 20 is input to the wireless unit 32 via the control unit 34, subjected to modulation processing by the wireless unit 32, and wirelessly connected to an external wireless LAN via the antenna 10. Sent.

On the other hand, when the card-type wireless device 1 is not connected to the personal computer 20 (that is, when it is carried as a pager), the insertion determining unit 33
Is not input to the control unit 34, and the control unit 34
Outputs the antenna switching signal 36 preset in the ROM to the switching circuit unit 31 and causes the switching circuit unit 31 to set the planar loop antennas 5 and 6 as antennas used for wireless communication. Then, call information and the like wirelessly transmitted from an external base station or the like is received by the wireless unit 32 via the antennas 5 and 6,
Based on the received information, the control unit 34 causes a speaker (not shown) to oscillate a ringing tone, or causes a display means (not shown) to display and output a message.

FIG. 7 shows an internal configuration according to a second example of the card type radio. In this example, the insertion determination unit 33
Is provided, a changeover switch 11 is provided, and according to an antenna changeover instruction 39 from the changeover switch 11,
The control unit 34 outputs a preset antenna switching signal 36 to the switching circuit unit 31 and causes the switching circuit unit 31 to switch an antenna on a communication path to set an antenna used for wireless communication. Therefore, in this example, the card type radio 1
The user operates the changeover switch 11 in accordance with the actual use situation of, so that one of the planar loop antennas 5 and 6 and the linear loop antenna 10 can be set as an antenna used for wireless communication. As a result, it is possible to obtain a good antenna gain in accordance with the actual situation.

FIG. 8 shows an internal configuration according to a third example of the card type radio. In this example, the insertion determination unit 33
An electric field strength detection circuit 38 is provided as a part of the radio section 32 in place of the switch 11 and the changeover switch 11. The electric field strength of the signal received from the antenna is detected by the electric field strength detection circuit 38 and input to the control section 34. You. And the control unit 3
In step 4, it is determined whether or not the detected electric field strength is equal to or higher than a predetermined threshold. If the detected electric field strength is lower than the threshold, a switching signal is output to the switching circuit unit 31 to switch the antenna used for wireless communication. Therefore, in this example, one of the planar loop antennas 5 and 6 and the linear loop antenna 10 is changed to an antenna used for wireless communication according to the actual reception state of the card-type wireless device 1. Thus, a good antenna gain exceeding a predetermined electric field strength can be obtained in any antenna selection state.

FIG. 9 shows an internal configuration according to a fourth example of a card type radio. In this example, an insertion determination unit 33, a changeover switch 11, and an electric field strength detection circuit 38 are provided to detect the use status of the card-type wireless device 1.
0, the connection detection signal 35
Is input to the control unit 34, and when the user operates the changeover switch 11, an antenna switching instruction 39 is input to the control unit 34, and the electric field intensity of the signal received from the antenna is transmitted from the electric field intensity detection circuit 38 to the control unit 34. Is input to

Here, in the control section 34 of the present embodiment, when the above-mentioned inputs are made at the same time, control is performed with priority on these inputs. That is, when the notification 35 that the card-type wireless device 1 is connected to the personal computer 20, the antenna switching instruction 39 by the user, and the notification that the electric field intensity received by the antenna has fallen below a predetermined value are simultaneously input. The controller 34 outputs a switching signal 36 in response to an antenna switching instruction 39 from the user, and causes the switching circuit 31 to switch the antenna according to the user's instruction as an antenna used for wireless communication. In addition, the antenna switching instruction 39 was not input by the user, and the notification 35 that the card-type wireless device 1 was connected to the personal computer 20 and the notification that the electric field strength received by the antenna was lower than the predetermined value were simultaneously input. In this case, the control unit 34 outputs a switching signal 36 in response to the connection notification 35 to the personal computer 20, and causes the switching circuit unit 31 to switch the antenna corresponding to the antenna used for wireless communication.

FIGS. 11 and 12 show the card-type wireless device 1 having the planar loop antennas 5 and 6 and the linear loop antenna 10 in the attitude with respect to the arrival direction of the radio wave as shown in FIG. 3 shows the measurement results of the antenna gain characteristics in free space when various changes are made. That is, the card type radio 1 is shown in FIGS. 10 (a), (b), and (c).
As shown in (3), the antenna is installed in three positions with respect to the radio wave arrival direction (Z-axis direction), and is rotated around the Y-axis.
Antenna gain characteristics were measured every 5 degrees. The measurement of the antenna characteristics includes the case where only the planar loop antennas 5 and 6 are used for wireless communication and the case where the planar loop antennas 5 and 6 and the linear loop antenna 10 are selectively switched and used for wireless communication. The measurement result of the former is shown in FIG. 11, and the measurement result of the latter is shown in FIG. The characteristics shown by the solid lines in FIGS. 11 and 12 are the measurement results in the posture shown in FIG. 10A, and the characteristics shown by the dotted lines in FIG.
The measurement results are shown in the posture shown in FIG. 11B, and the characteristics indicated by the dashed line in FIG. 11 are the measurement results obtained in the posture shown in FIG.

According to the measurement results, as shown by the dashed line in FIG. 11, when only the planar loop antennas 5 and 6 are used for wireless communication and the posture is as shown in FIG. Although greatly reduced, as shown by the dashed line in FIG. 12, even when the posture is in the state shown in FIG. 10C, the flat loop antennas 5, 6 and the linear loop antenna 10 are selectively switched. The antenna gain has been greatly improved by using it for wireless communication. That is, a good antenna gain is realized by the linear loop antenna 10.

As shown by the dotted line in FIG. 11, when only the planar loop antennas 5 and 6 are used for wireless communication and the posture is as shown in FIG. 10B, the antenna gain becomes 90 degrees. And 270 degrees, the shape of FIG. 12 is constrained, but as shown by a dotted line in FIG.
Even in the state shown by 0 (b), by selectively switching between the planar loop antennas 5 and 6 and the linear loop antenna 10 for use in wireless communication, the antenna gain became substantially circular and was greatly improved. That is, a good antenna gain is realized by the linear loop antenna 10.

When only the linear loop antenna 10 is used for wireless communication, as shown in FIG.
In the state of (a), the antenna gain is greatly reduced. However, as shown in FIG. 12, by selectively switching between the planar loop antennas 5 and 6 and the linear loop antenna 10 and using them for wireless communication, the antenna gain is reduced. Was greatly improved. That is, good antenna gain is realized by the planar loop antennas 5 and 6.

FIGS. 14 and 15 show the attitude of the card type radio 12 having the monopole antenna 13 and the planar loop antennas 5 and 6 as in the second embodiment. The measurement results of the antenna gain characteristics in the free space when the direction of arrival of the radio wave is variously changed are shown.

According to the measurement results, as shown by the solid line in FIG. 14, when only the monopole antenna 13 is used for wireless communication and the posture is in the state shown in FIG. 10A, the antenna gain is greatly reduced. However, as shown by the solid line in FIG. 15, even when the posture is the state shown in FIG. 10A, the monopole antenna 13 and the planar loop antennas 5 and 6 are selectively switched and used for wireless communication. , The antenna gain was greatly improved. That is, good antenna gain is realized by the planar loop antennas 5 and 6.

In the above description, an example was shown in which the attitude of the card radio was changed in the free space. However, similar measurement results can be obtained in an environment where the card radio is accommodated in a pocket or the like of clothes. Can be Also, in the above description,
Although a flat loop antenna and a linear loop antenna are shown as the magnetic field sensitive antenna, and a monopole antenna is shown as the electric field sensitive antenna, other various types of known magnetic field sensitive antennas and electric field sensitive antennas may be used. In other words, an antenna suitable for a portable communication device such as a pager and an antenna suitable for a wireless modem are set in advance, and these antennas are switched and used according to the use condition of the card type wireless device. do it.

[0035]

As described above, according to the card-type radio device of the present invention, an antenna suitable for a portable communication device such as a pager and an antenna suitable for a radio modem are set in advance, These antennas are switched and used according to the usage status of the type radio, so that a sufficient antenna gain can be obtained corresponding to various usage statuses,
By improving the reliability of wireless communication, it is possible to expand a service area and improve the reliability of communication services.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the usage of a card-type wireless device as a wireless modem according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating an appearance of a card-type wireless device according to an embodiment of the present invention.

FIG. 3 is a side view showing the appearance of the card-type wireless device according to one embodiment of the present invention.

FIG. 4 is an exploded perspective view showing a part of the card-type wireless device according to the embodiment of the present invention;

FIG. 5 is a perspective view illustrating an appearance of a card-type wireless device according to another embodiment of the present invention.

FIG. 6 is a block diagram illustrating an example of an internal configuration of a card-type wireless device according to the present invention.

FIG. 7 is a block diagram showing another example of the internal configuration of the card-type wireless device according to the present invention.

FIG. 8 is a block diagram showing still another example of the internal configuration of the card-type wireless device according to the present invention.

FIG. 9 is a block diagram showing still another example of the internal configuration of the card-type wireless device according to the present invention.

FIG. 10 is a view showing various postures of the card-type wireless device according to the present invention.

FIG. 11 is a diagram showing antenna characteristics when only the flat loop antenna of the card-type wireless device according to the present invention is used.

FIG. 12 is a diagram showing antenna characteristics of the card-type wireless device according to the present invention when selection switching between a linear loop antenna and a flat loop antenna is performed.

FIG. 13 is a diagram showing antenna characteristics when only a linear loop antenna of the card-type wireless device according to the present invention is used.

FIG. 14 is a diagram illustrating antenna characteristics when only a monopole antenna of the card-type wireless device according to the present invention is used.

FIG. 15 is a diagram showing antenna characteristics when the selection and switching between the flat loop antenna and the monopole antenna of the card-type wireless device according to the present invention are performed.

[Explanation of symbols]

1, 12: card-type wireless device, 5, 6: flat loop antenna, 10: linear loop antenna, 1
DESCRIPTION OF SYMBOLS 1 ... Changeover switch, 31 ... Changeover circuit part, 32
··· Radio section 33 · Insertion determination section · 34 · Control section · 38 · · · Electric field strength detection circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04B 7/26 H04B 7/26 B

Claims (10)

[Claims] 1. A card-type wireless device which is used as a wireless modem by being connected to an information processing device and used as a portable wireless device by being carried alone. An antenna, a second antenna set for a portable wireless device, a control circuit for outputting an antenna switching signal according to the use condition of the card-type wireless device, and an antenna used for wireless communication according to the antenna switching signal A card-type wireless device, comprising: a switching circuit; and a wireless circuit that performs wireless communication via the switched antenna. 2. The card-type wireless device according to claim 1, further comprising an electric field intensity detection circuit for detecting an electric field intensity of a signal received from the antenna, wherein the control circuit is configured to detect the electric field intensity signal from the electric field intensity detection circuit. A card-type wireless device that outputs an antenna switching signal to improve the electric field strength. 3. The card-type wireless device according to claim 1, further comprising a connection determining circuit for detecting a state in which the card-type wireless device is connected to the information processing device, wherein the control circuit detects the connection from the connection determining circuit. A card-type wireless device that outputs an antenna switching signal based on a signal and switches a first antenna to an antenna used for wireless communication. 4. The card-type wireless device according to claim 1, further comprising: a switch for receiving an antenna switching instruction from a user, wherein the control circuit outputs an antenna switching signal based on the switching instruction from the switch. A card-type wireless device that switches an antenna selected by a user to an antenna used for wireless communication. 5. The card-type wireless device according to claim 1, wherein an electric-field-strength detecting circuit for detecting an electric-field intensity of a signal received from an antenna, and a state in which the card-type wireless device is connected to the information processing device. A connection determination circuit, wherein the control circuit outputs an antenna switching signal based on the connection detection signal of the connection detection signal from the connection determination circuit and the electric field intensity signal from the electric field intensity detection circuit, A card-type wireless device, wherein the antenna is switched to an antenna used for wireless communication. 6. The card-type wireless device according to claim 1, wherein an electric-field-strength detecting circuit for detecting an electric-field intensity of a signal received from an antenna, and a state in which the card-type wireless device is connected to the information processing device. A connection determination circuit; and a changeover switch for receiving an antenna switching instruction from a user. The control circuit includes a connection detection signal from the connection determination circuit, an electric field intensity signal from the electric field intensity detection circuit, and an antenna switching instruction from the changeover switch. Wherein the antenna switching signal is output based on an antenna switching instruction, and the antenna selected by the user is switched to an antenna used for wireless communication. 7. The card-type wireless device according to claim 1, wherein the first antenna is inserted into a connection slot of a personal computer as an information processing device. A card-type wireless device provided at a portion of the card-type wireless device located outside from the slot in a state where the card-type wireless device is connected. 8. The card-type wireless device according to claim 1, wherein the first antenna and the second antenna are provided with their polarization planes crossing each other. A card-type wireless device characterized by the following. 9. The card-type wireless device according to claim 1, wherein the first antenna is an electric field sensitive antenna, and the second antenna is a magnetic field sensitive antenna. A card-type wireless device characterized by the following. 10. The card-type wireless device according to claim 1, wherein the first antenna and the second antenna are each a magnetic field sensitive antenna. Card type radio.