JP2005101952A - Antenna and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna compatible with the intention to cope with both the size suited to portable electronic apparatus and to realize electrical characteristics. <P>SOLUTION: The antenna 10 comprises a linear antenna conductor 11 and a case 12 for housing the antenna conductor 11. The case 12 has a winder 14 connected to the antenna conductor 11 for winding up the conductor 11. The winder 14 has a specified antenna pattern PT, subjected to a pattern process to gain an effective length of antenna with the antenna conductor 11 base end electrically connected to the antenna pattern PT. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an antenna device that can be attached to and detached from an electronic device main body, and an electronic device in which the antenna device is attached to the main body.

  As an antenna device in which a linear antenna conductor that has been conventionally used is formed to be stretchable, there is one described in Patent Document 1, for example.

Japanese Utility Model Publication No. 5-46105

  Specifically, Patent Document 1 discloses an antenna device including an extendable antenna rod and a housing case in which a base end portion of the antenna rod is supported. In particular, this antenna device has a lobe for expanding and contracting the antenna rod, a take-up drum formed with an open storage part for inserting and removing the lobe, and a lower end portion of the take-up drum reduces frictional resistance. The housing case is provided with a plate member that is slidably contacted through the grease. Thereby, in this antenna device, the frictional resistance against the plate member of the take-up drum can be reduced, and the lobe can be taken in and out reliably.

  In addition, as an antenna device, an antenna device that connects two different types of antennas to increase the effective length of the antenna has been proposed (see, for example, Patent Document 2 and Patent Document 3).

Japanese Utility Model Publication No. 62-64013 JP-A-7-288413

  Patent Document 2 discloses a rod antenna in which an extension coil that increases the effective length of the antenna is housed in a guide pipe. Further, in Patent Document 3, a winding body having a base end connected to a power supply cable and a hollow portion of the winding body so that the base end is connected to a tip end of the winding body are inserted into the casing. An antenna device including a rod-like antenna element that is detachably accommodated is disclosed.

  Furthermore, as an antenna apparatus provided with the technique for improving reception efficiency, there exists what is described in patent document 4, for example.

JP-A-5-55817

  Specifically, in Patent Document 4, an antenna body that can be stored in a telephone body is divided into an antenna base and an antenna rod, and the antenna base and the antenna rod are connected via a hinge mechanism. An antenna for a mobile phone is disclosed. As a result, in this cellular phone antenna, even if the cellular phone is placed horizontally, the antenna performance is not deteriorated and the incoming call rate of the cellular phone can be secured.

  Furthermore, development of various wireless communication technologies such as mobile communication devices such as mobile phones and so-called IEEE (Institute of Electronic and Electronics Engineers) 802.11 standard wireless LAN (Local Area Network) has been remarkably advanced in recent years. Along with this, various antenna devices used for these have been developed.

  For example, as an antenna device mounted on a card-type communication device that is attached to and detached from an information processing apparatus such as a personal computer for wireless communication, for example, a loop antenna 100 as shown in FIG. A rod antenna 110 as shown is known. As an antenna device, although not shown in particular, a chip-like antenna element that can be surface-mounted on a printed wiring board provided inside the device main body is also known.

  By the way, in recent years, with the shift of television broadcasting from current terrestrial analog broadcasting to terrestrial digital broadcasting, demand for antenna devices mounted on various electronic devices such as television tuners compatible with terrestrial digital broadcasting is increasing. Is also growing. There are also many requests for receiving terrestrial digital broadcasts by portable electronic devices.

  Here, an antenna device required for an electronic device compatible with terrestrial digital broadcasting needs to receive radio waves in a low frequency band such as a 470 MHz band and has a very wide required bandwidth. In principle, it is larger than an antenna device used in a frequency band of GHz band such as a wireless LAN or a so-called Bluetooth (registered trademark).

  However, the antenna device has a problem in that the radiation characteristic deteriorates with downsizing, so that there is a problem that the size has to be increased in order to maintain a good characteristic, particularly in a portable electronic device. At present, there is no one that satisfies the conflicting requirements of downsizing and maintaining characteristics.

  The present invention has been made in view of such a situation, and an antenna device capable of achieving both a size suitable for a portable electronic device and realization of good electrical characteristics, and the antenna device is provided. It is an object to provide an electronic device.

  An antenna device according to the present invention that achieves the above-described object is an antenna device that is attachable to and detachable from an electronic apparatus main body, and includes a linear antenna conductor and a storage portion that stores the antenna conductor. The storage unit includes a winding unit that is connected to the antenna conductor and winds up the antenna conductor, and the winding unit is formed with a predetermined antenna pattern subjected to a patterning process. The base end portion of the antenna conductor is electrically connected to the antenna pattern.

  Such an antenna device according to the present invention is configured to efficiently store the antenna conductor in the storage portion by winding the antenna conductor with the winding portion, and the base end portion of the antenna conductor to the winding portion. By electrically connecting to the formed predetermined antenna pattern, the effective length of the antenna can be earned.

  In the antenna device according to the present invention, the storage unit is configured to be rotatable with respect to the electronic device main body.

  Thereby, in the antenna device according to the present invention, the polarization plane of the radio wave that can be transmitted and received can be arbitrarily switched between the horizontal polarization and the vertical polarization, depending on the mounting state of the electronic device body. Even a radio wave having a polarization plane that cannot be transmitted / received originally can be transmitted / received.

  At this time, in the antenna device according to the present invention, a power supply terminal electrically connected to the end portion of the antenna pattern is provided on one side wall that constitutes the storage portion. At least electrical connection with the electronic device main body is maintained through the power feeding terminal.

  Thus, in the antenna device according to the present invention, even when the storage unit is rotated with respect to the electronic device main body, the electric connection with the electronic device main body is appropriately performed without affecting transmission / reception. Can be held in.

  Furthermore, in the antenna device according to the present invention, in order to generate a predetermined capacitance between the antenna pattern formed on the winding unit and the antenna unit, the antenna unit is spatially separated from the winding unit. In addition, a ground is provided at a position where at least a part of the main surface of the winding portion where the antenna pattern is formed overlaps, and the antenna pattern is drawn out of the housing portion. Depending on the length of the winding portion, the winding portion is formed so that the overlapping area with the ground is variable.

  Accordingly, the antenna device according to the present invention is configured equivalently to a circuit including a capacitor whose capacitance is variable. Therefore, in the antenna device according to the present invention, it is extremely easy to form an antenna pattern on the winding unit that generates an appropriate capacitance according to the length of the antenna conductor drawn out of the storage unit. It is possible to adjust the impedance appropriately with a simple configuration.

  In the antenna device according to the present invention, it is desirable to form the antenna conductor as a wire with a predetermined shape pattern in order to increase the effective length of the antenna.

  Further, in the antenna device according to the present invention, in order not to cause a change in characteristics, the antenna conductor is made of a material that does not bend when drawn to the outside of the storage portion up to the maximum length. desirable.

  An electronic device according to the present invention that achieves the above-mentioned object is an electronic device in which an antenna device is attached to a main body, and the antenna device houses a linear antenna conductor and the antenna conductor. A storage unit, and the storage unit includes a winding unit that is connected to the antenna conductor and winds up the antenna conductor. The winding unit has a predetermined antenna pattern that has been subjected to patterning processing. And the base end of the antenna conductor is electrically connected to the antenna pattern.

  In such an electronic apparatus according to the present invention, the antenna device can efficiently store the antenna conductor in the storage portion by winding the antenna conductor with the winding portion, and the base end portion of the antenna conductor can be provided. By electrically connecting to a predetermined antenna pattern formed on the winding portion, the effective length of the antenna can be earned.

  In the electronic device according to the present invention, the storage portion is configured to be rotatable with respect to the main body.

  Thereby, in the electronic device according to the present invention, the plane of polarization of the radio wave that can be transmitted and received by the antenna device can be arbitrarily switched between horizontal polarization and vertical polarization. Can transmit and receive even radio waves having a polarization plane that cannot be transmitted and received.

  At this time, in the electronic device according to the present invention, a power supply terminal electrically connected to the end portion of the antenna pattern is provided on one side wall constituting the storage portion. At least electrical connection with the main body is maintained through the power feeding terminal.

  As a result, in the electronic device according to the present invention, even when the housing portion of the antenna device is rotated with respect to the main body, the electrical connection with the main body is appropriately performed without affecting transmission / reception. Can be held.

  Further, in the electronic apparatus according to the present invention, the electronic device according to the present invention is a position spatially separated from the winding unit in order to generate a predetermined capacitance between the antenna pattern formed on the winding unit. In addition, a ground is provided at a position where at least a partial region of the main surface of the winding portion on which the antenna pattern is formed overlaps, and the antenna pattern is connected to the antenna conductor drawn out of the storage portion. Depending on the length, it is formed in the winding part so that the overlapping area with the ground is variable.

  Thereby, in the electronic apparatus according to the present invention, the antenna device is configured equivalently to a circuit including a capacitor whose capacitance is variable. Therefore, in the electronic apparatus according to the present invention, by forming an antenna pattern on the winding unit that generates an appropriate capacitance according to the length of the antenna conductor drawn out of the housing unit of the antenna device. It is possible to adjust the impedance appropriately with a very simple configuration.

  Further, in the electronic device according to the present invention, the antenna device can be configured to be detachable from the main body, which makes it possible to share the antenna device among a plurality of electronic devices. Convenience can be improved.

  Furthermore, in the electronic device according to the present invention, the housing portion may be the housing of the main body. That is, in the electronic device according to the present invention, the antenna device and the main body may be configured integrally.

  In the electronic device according to the present invention, it is desirable to form the antenna conductor of the antenna device as a wire with a predetermined shape pattern in order to increase the effective length of the antenna.

  In the electronic apparatus according to the present invention, in order not to cause a change in characteristics as an antenna, the antenna conductor of the antenna device is a material that does not bend when pulled out to the outside of the storage portion up to the maximum length. It is desirable to use what consists of.

  The present invention can be downsized to a size suitable for a portable electronic device with an extremely simple configuration, and also has good electrical characteristics without causing deterioration of radiation characteristics. Can be realized.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  This embodiment is an antenna device that can be attached to and detached from various electronic equipment bodies such as a television tuner compatible with terrestrial digital broadcasting. In particular, this antenna device can realize a size that can be suitably applied to a portable small electronic device body, and can also realize good electrical characteristics.

  Specifically, as shown in FIG. 1, the antenna device 10 includes a linear antenna conductor 11 made of a predetermined conductive wire and a predetermined shape as a storage portion that stores the antenna conductor 11. And a housing 12. The antenna conductor 11 is configured to be expandable and contractable in a direction indicated by an arrow a in the figure via an opening 12a formed in a part of the housing 12. Further, the antenna conductor 11 is formed with a tip portion 11a so that the end exposed to the outside of the housing 12 is a part of the antenna in order to increase the effective length of the antenna. Further, the antenna conductor 11 may not be formed as a complete straight line material, but may be formed as a wire material having a predetermined shape pattern such as a fine wave shape as shown in FIG. The antenna conductor 11 can be configured using a material having moderate elasticity such as stainless steel. However, the antenna conductor 11 is drawn to the outside of the housing 12 to the maximum length so as not to cause a change in characteristics. Those that do not bend are desirable.

  As shown in FIG. 3, the antenna device 10 having such an appearance is configured to be rotatable about a shaft 13 fixed to the housing 12 in the direction indicated by b in FIG. 3. And a winding portion 14 for winding the connected antenna conductor 11. In order to increase the effective length of the antenna, a predetermined antenna pattern PT such as a spiral shape or a meander shape as shown in FIG. The base end portion of the antenna conductor 11 is electrically connected to the end portion 15 of the antenna pattern PT.

  For example, as shown in FIG. 5, the antenna device 10 can be attached to and detached from various electronic device main bodies 20 including a thin-plate television tuner compatible with terrestrial digital broadcasting. Specifically, in the antenna device 10, a power supply terminal (not shown) for mounting on the electronic device main body 20 is provided on one side wall SW constituting the housing 12 indicated by a hatched portion in FIG. 3. The power supply terminal is configured to be electrically connected to the end of the antenna pattern PT connected to the shaft 13 (not shown), so that the electronic device is connected via the power supply terminal. It is electrically connected to the device body 20.

  In the antenna device 10, when not in use, the antenna conductor 11 can be housed inside the housing 12 as shown in FIG. 5. In use, in the antenna device 10, as shown in FIG. 6, the antenna conductor 11 is pulled out of the housing 12 in the direction indicated by arrow c in the figure, and the antenna pattern PT, the antenna conductor 11, and the tip The frequency adjustment can be performed by setting the antenna length to the desired length of the section 11a.

  Further, in the antenna device 10, as shown in FIG. 7, the housing 12 is connected to the electronic device main body 20 while maintaining electrical connection with the electronic device main body 20 through at least the power feeding terminal. , And is configured to be rotatable in a direction indicated by an arrow d in FIG. In other words, the antenna device 10 is configured to be rotatable with respect to the electronic device main body 20, so that the polarization plane of the radio wave that can be transmitted and received can be arbitrarily switched between horizontal polarization and vertical polarization. . Therefore, in the antenna device 10, even if the radio wave has a polarization plane that cannot be transmitted or received depending on the mounting state of the electronic device main body 20, the mounting angle with respect to the electronic device main body 20 is set to an angle that matches the polarization plane. Setting makes it possible to transmit and receive. For the rotation mechanism, an existing mechanism such as a rotary joint can be arbitrarily applied.

  Now, as described above, the antenna device 10 increases the effective length of the antenna and reduces the size by forming a predetermined antenna pattern PT on the winding portion 14 as well as the antenna conductor 11 and the tip portion 11a. However, the applicant of the present application is conducting an experiment for the purpose of verifying whether or not it is possible to cope with terrestrial digital broadcasting with such a configuration.

  The experiment was carried out by mounting a simple monopole antenna that is electrically connected to a predetermined antenna pattern formed on the winding portion of a base end portion of a predetermined conductive wire on a substrate assuming an actual machine. .

  First, when a monopole antenna made of only a conductive wire without a winding part is applied to a so-called UHF (Ultra High Frequency) band, which is the lowest frequency of 470 MHz band, a voltage standing wave ratio (VSWR) It was confirmed that an antenna length of 130 mm was necessary in order to make the The antenna length of 130 mm corresponds to the length of the antenna conductor 11 drawn out of the housing 12 in the antenna device 10 and remains inside the housing 12 without being exposed to the outside. Including the part corresponds to, for example, about 160 mm. FIG. 8A shows VSWR (vertical axis) with respect to the band frequency (horizontal axis) obtained in this experiment, and FIG. 8B shows a Smith chart.

  On the other hand, when a monopole antenna in which the base end portion of the conductive wire is electrically connected to a predetermined antenna pattern formed on the winding portion is applied to the 470 MHz band, the characteristic that the VSWR becomes a predetermined value or less. When the length of the conductive wire which can be obtained was calculated | required, it was confirmed that a length shorter than 130 mm may be sufficient. FIGS. 9 (a) and 9 (b) show a VSWR and a Smith chart with respect to a band frequency when a certain first antenna pattern is formed on the winding unit, respectively. As a result, it was sufficient to use a conductive wire of 90 mm (corresponding to the length of the antenna conductor drawn out of the casing). FIGS. 10 (a) and 10 (b) show a VSWR and a Smith chart with respect to a band frequency when a certain second antenna pattern is formed on the winding unit, respectively. As a result, it was sufficient to use a conductive wire of 70 mm (corresponding to the length of the antenna conductor drawn out of the casing).

  Thus, it can be seen that electrically connecting the base end portion of the predetermined conductive wire to the predetermined antenna pattern formed in the winding portion is effective in reducing the size of the antenna device. In particular, the antenna device 10 shown as an embodiment of the present invention is configured so that the antenna conductor 11 is housed inside the housing 12 by winding the antenna conductor 11 with the winding portion 14. Although it is simple, it is possible to realize efficient housing of the antenna conductor 11, which is effective in reducing the size. And although the antenna device 10 is extremely compact in size, it can obtain the same characteristics as other large antennas such as rod antennas, and can cope with digital terrestrial broadcasting.

  Incidentally, in general, an antenna device needs to adjust impedance with the surrounding environment using a matching element such as a coil or a capacitor. The matching constant of the antenna device using these coils and capacitors is known to depend on the frequency, but also depends on the antenna length. Actually, the applicant of the present application assumes an active matching circuit including a coil and a capacitor, and obtains a matching constant at each frequency in the UHF band for a monopole antenna having three antenna lengths of 160 mm, 115 mm, and 88 mm. The result is shown in FIG. As described above, the matching constant varies depending on the frequency and also varies depending on the antenna length. Therefore, in the antenna device, in order to adjust the impedance appropriately, it is necessary to determine the matching constant according to the corresponding frequency and the antenna length to be used.

  Here, since adjustment of the matching constant of the coil requires a relatively large number of large elements, there is a problem that it is difficult in terms of circuit to achieve downsizing. Therefore, in the antenna device, in order to adjust the impedance while reducing the size, it is easier to perform adjustment using a capacitor.

  Based on these matters, the applicant of the present application has devised an antenna device 10 capable of appropriately adjusting impedance based on a very simple configuration.

  Specifically, in the antenna device 10, as shown in FIG. 12, the main surface of the winding unit 14 at a position spatially separated from the winding unit 14 and at least the antenna pattern PT is formed. By providing the ground 16 at a position where a part of the region overlaps, a predetermined capacitance is generated between the antenna pattern PT formed on the winding unit 14 and the ground 16. For example, in the antenna device 10, as indicated by the hatched portion in the figure, by sticking a predetermined metal plate inside the housing 12, the antenna device 10 is spatially separated from the winding portion 14 and at least the antenna pattern PT. The ground 16 can be provided so that a partial region of the main surface of the winding portion 14 in which is formed overlaps.

  Further, in the antenna device 10, the overlapping area with the ground 16 is variable according to the length of the antenna conductor 11 drawn out of the housing 12, that is, according to the rotation angle of the winding unit 14. A simple antenna pattern PT is formed on the winding portion 14.

  That is, the antenna device 10 is configured equivalent to a circuit including a capacitor C whose capacitance is variable as shown in FIG.

  Thereby, in the antenna device 10, by forming the antenna pattern PT in the winding portion 14 so as to generate an appropriate capacitance according to the length of the antenna conductor 11 drawn out of the housing 12, It is possible to adjust the impedance appropriately with a very simple configuration.

  As described above, in the antenna device 10 shown as the embodiment of the present invention, the linear antenna conductor 11 made of a predetermined conductive wire is connected to the winding unit 14 provided inside the housing 12. The antenna conductor 11 can be wound up, and the base end portion of the antenna conductor 11 is electrically connected to a predetermined antenna pattern PT formed on the winding portion 14, thereby reducing the size of the antenna conductor 11 based on an extremely simple configuration. However, it is possible to achieve good electrical characteristics without causing deterioration of radiation characteristics.

  In particular, the antenna device 10 is optimally applied to a television tuner used in a portable electronic device compatible with terrestrial digital broadcasting, which requires a reduction in size, weight, and high gain.

  The present invention is not limited to the embodiment described above. For example, in the above-described embodiment, the antenna device 10 is described as being configured to be detachable from the electronic device main body 20, but in the present invention, the antenna device and the electronic device main body are configured integrally. It can also be applied to electronic devices. That is, the present invention can be configured such that the housing of the antenna device, which is a housing portion that houses the antenna conductor, is used as the housing of the electronic device main body, and the antenna conductor is pulled out of the housing portion and used. Such a form is suitable for application to a notebook personal computer having various communication functions including, for example, reception of television broadcasts.

  Thus, it goes without saying that the present invention can be modified as appropriate without departing from the spirit of the present invention.

It is a perspective view explaining the external appearance structure of the antenna apparatus shown as embodiment of this invention. It is the figure which expanded the principal part of the antenna conductor in the antenna device. It is a perspective view explaining the internal structure of the antenna apparatus. It is a top view of the winding part in the antenna device, Comprising: It is a figure for demonstrating the example of the antenna pattern formed in the said winding part. It is a perspective view explaining a mode that the antenna device was attached to an electronic equipment main part, and is a figure for explaining a mode at the time of non-use. It is a perspective view explaining a mode that the antenna device was attached to an electronic equipment main part, and is a figure for explaining a mode at the time of use. It is a perspective view explaining a mode that the antenna apparatus was rotated with respect to the electronic device main body. It is a figure explaining the experimental result which acquired the characteristic that VSWR became below a predetermined value, when a monopole antenna which consists only of a conductive wire which does not provide a winding part is applied to a 470 MHz band, and is a figure explaining VSWR with respect to a band frequency. It is a figure explaining a relationship. It is a Smith chart corresponding to Fig.8 (a). Experimental results of obtaining a characteristic that the VSWR is a predetermined value or less when a monopole antenna in which the base end portion of the conductive wire is electrically connected to the first antenna pattern formed in the winding portion is applied to the 470 MHz band. It is a figure explaining, Comprising: It is a figure explaining the relationship of VSWR with respect to a band frequency. 10 is a Smith chart corresponding to FIG. Experimental results of obtaining a characteristic that the VSWR is a predetermined value or less when a monopole antenna in which the base end portion of the conductive wire is electrically connected to the second antenna pattern formed in the winding portion is applied to the 470 MHz band. It is a figure explaining, Comprising: It is a figure explaining the relationship of VSWR with respect to a band frequency. It is a Smith chart corresponding to Fig.10 (a). It is a figure explaining the result of having calculated | required the matching constant in each frequency of a UHF band about the monopole antenna which consists of three types of antenna length. It is a perspective view explaining the internal structure of the antenna apparatus which provided the ground so that it might spatially overlap with the antenna pattern formed in the winding part. It is a figure explaining the equivalent circuit of the antenna apparatus shown in FIG. It is a perspective view explaining the external appearance structure of the card-type communication device carrying a loop antenna. It is a perspective view explaining the external appearance structure of the card-type communication device in which the rod antenna is mounted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Antenna apparatus 11 Antenna conductor 11a Tip part 12 Case 12a Opening part 13 Shaft 14 Winding part 15 End part 16 Ground PT Antenna pattern SW Side wall

Claims (14)

An antenna device that can be attached to and detached from an electronic device body,
A linear antenna conductor;
A storage section for storing the antenna conductor;
The storage unit includes a winding unit that is connected to the antenna conductor and winds up the antenna conductor;
A predetermined antenna pattern that has been subjected to a patterning process is formed in the winding unit,
An antenna device, wherein a base end portion of the antenna conductor is electrically connected to the antenna pattern. The antenna device according to claim 1, wherein the storage unit is configured to be rotatable with respect to the electronic device main body. A power supply terminal electrically connected to an end portion of the antenna pattern is provided on one side wall constituting the storage portion,
The antenna device according to claim 2, wherein the storage unit holds electrical connection with the electronic device main body through at least the power feeding terminal. In order to generate a predetermined capacitance between the antenna pattern and the antenna pattern formed on the winding unit, the antenna pattern is formed at a position spatially separated from the winding unit. A ground is provided at a position where a part of the main surface of the winding part overlaps,
The antenna pattern is formed in the winding portion so that an overlapping area with the ground is variable according to a length of the antenna conductor drawn out of the storage portion. Item 2. The antenna device according to Item 1. The antenna device according to claim 1, wherein the antenna conductor is formed as a wire having a predetermined shape pattern. The antenna device according to claim 1, wherein the antenna conductor is made of a material that does not bend when drawn out to the outside of the storage portion up to a maximum length. An electronic device with an antenna device attached to the main body,
The antenna device is
A linear antenna conductor;
A storage section for storing the antenna conductor;
The storage unit includes a winding unit that is connected to the antenna conductor and winds up the antenna conductor;
A predetermined antenna pattern that has been subjected to a patterning process is formed in the winding unit,
An electronic apparatus, wherein a base end portion of the antenna conductor is electrically connected to the antenna pattern. The electronic apparatus according to claim 7, wherein the storage unit is configured to be rotatable with respect to the main body. A power supply terminal electrically connected to an end portion of the antenna pattern is provided on one side wall constituting the storage portion,
The electronic device according to claim 8, wherein the storage unit holds electrical connection with the main body via at least the power feeding terminal. In order to generate a predetermined capacitance between the antenna pattern and the antenna pattern formed on the winding unit, the antenna pattern is formed at a position spatially separated from the winding unit. A ground is provided at a position where a part of the main surface of the winding part overlaps,
The antenna pattern is formed in the winding portion so that an overlapping area with the ground is variable according to a length of the antenna conductor drawn out of the storage portion. Item 8. The electronic device according to Item 7. The electronic apparatus according to claim 7, wherein the antenna device is configured to be detachable from the main body. The electronic device according to claim 7, wherein the housing portion is a housing of the main body. The electronic device according to claim 7, wherein the antenna conductor is formed as a wire having a predetermined shape pattern. The electronic device according to claim 7, wherein the antenna conductor is made of a material that does not bend when pulled out to the outside of the storage portion up to a maximum length.

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