JP4393228B2 - Small antenna and wireless tag provided with the same - Google Patents

Small antenna and wireless tag provided with the same Download PDF

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JP4393228B2
JP4393228B2 JP2004054078A JP2004054078A JP4393228B2 JP 4393228 B2 JP4393228 B2 JP 4393228B2 JP 2004054078 A JP2004054078 A JP 2004054078A JP 2004054078 A JP2004054078 A JP 2004054078A JP 4393228 B2 JP4393228 B2 JP 4393228B2
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antenna element
pair
auxiliary
main antenna
main
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JP2005244778A (en
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真恒 寺内
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シャープ株式会社
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Description

  The present invention relates to a small antenna and a wireless tag used in, for example, an RFID (Radio Frequency Identification) system.

  For example, as shown in FIG. 12, the RFID system includes a reader RW, an antenna A, and a wireless tag T. The reader RW transmits a radio wave signal, and the radio wave tag T transmits a radio wave signal from the reader RW. In response to the information stored in the memory in the tag, the input signal is subjected to reflection modulation and returned to the reader RW. The signal returned from the wireless tag T is demodulated by the reader RW to extract tag information.

  As the wireless tag, a microwave tag using a microwave (2.4 GHz band) frequency band is used in the FA field and the like. In microwave tags, batteryless tags that detect transmission radio waves from readers and use them as drive power to perform tag operations are being studied in many fields. In addition to FA, logistics and distribution Major utilization expansion is planned in related fields.

  Recently, standardization and legislation of RFID systems using the UHF frequency band (900 MHz band), which has a longer propagation distance than microwaves, has been promoted, and development of UHF tags corresponding to this has been promoted. ing.

  As a tag for UHF, for example, as shown in FIG. 13, linear main antenna elements 201 and 201 and auxiliary antenna elements 202 for transmitting and receiving signals as radio waves are formed on a dielectric substrate 203, and tag processing is performed. There is a UHF dipole tag integrated with a tag IC 204 having a function.

  However, the UHF dipole tag has a problem in that although the propagation distance is longer than that of the microwave tag as described above, the tag size is increased. For example, the microwave dipole tag is about 6 to 8 cm, whereas the UHF dipole tag is 16 to 21 cm, which is about three times as large as the microwave dipole tag.

  As a method for solving such a problem, there has been proposed a method for reducing the size of the antenna by making the dipole antenna into a meander line shape (bent shape) (see, for example, Patent Document 1).

As shown in FIG. 14, as a wireless tag having a meander antenna, meander-shaped main antenna elements 301 and 301 and a linear auxiliary antenna element 302 are formed on a dielectric substrate 303, and a tag IC 304 is incorporated. An integrated one is known. In the structure of FIG. 14, the gain is increased by the proximity of the main antenna element 301 and the auxiliary antenna element 302.
JP 2002-141732 A

  By the way, in the structure shown in FIG. 14, the auxiliary antenna element extends to both ends of the tag (both ends of the dielectric substrate) as in the meander-shaped main antenna element. Since the auxiliary antenna exists, the occupied area of the main antenna element in the both end areas is inevitably reduced, and there is a problem that the gain is lowered.

  In addition, there are many adjacent portions of the main antenna element and the auxiliary antenna element over almost the entire length of the auxiliary antenna element (see FIG. 15), and the antenna element portion and the matching portion are not clearly separated. Is a trade-off relationship. For this reason, it is necessary to devise the size and shape of both the main antenna element and the auxiliary antenna element in consideration of both matching with the tag IC and gain, and the design of the main antenna element and the auxiliary antenna element (antenna impedance There is a problem that the degree of freedom of design) is reduced and the matching loss is increased.

  The present invention has been made in view of such a situation, and provides a small antenna capable of easily performing impedance matching while maintaining gain, and a wireless tag including such a small antenna. The purpose is to provide.

Small antenna of the first embodiment according to the present invention includes a main antenna element of one pair formed at both end portions of the dielectric substrate, and an auxiliary antenna element formed between the pair of main antenna elements, the pair of main A matching portion connected between the antenna elements, the pair of main antenna elements, the auxiliary antenna element and the matching portion are formed on one side of the dielectric substrate, the auxiliary antenna element, Both ends are provided in the vicinity of the side where the matching portion of the pair of main antenna elements is connected, and the shape of both ends of the auxiliary antenna element is connected to the matching portion of the pair of main antenna elements. It is characterized by being a shape along the shape of the side being made.

According to the small antenna of the first embodiment according to the present invention, only the portion both end portions of the auxiliary antenna element is close to the pair of main antenna elements, local proximity of the main antenna element and said auxiliary antenna element becomes part, because the close position is divided almost clear, adjust the antenna impedance (adjustment of the capacity adjustment and the matching portion of the capacitor formed proximate portion and said main antenna element and the auxiliary antenna element), it can be performed independently regardless of the size and shape of the main antenna element. Therefore, it is possible to freely design the main antenna elements in gain priority.
Further, since the pair of main antenna elements, the auxiliary antenna elements, and the matching portion are formed on one surface of the dielectric substrate, the main antenna elements, the auxiliary antenna elements, and the matching portion are formed on the same plane. This makes it easy to manufacture and achieves a reduction in production costs. It is also possible to form each conductor line pattern of the main antenna element, the auxiliary antenna element, and the matching portion on a sheet-like object by printing.

In the small antenna according to the first aspect of the present invention, an L-shaped portion formed in an L-shape is opposed to each side of the pair of main antenna elements to which the matching portion is connected. It is preferable that the shape of both ends of the auxiliary antenna element is a shape along the L-shaped portion of the pair of main antenna elements.

In the small antenna according to the first aspect of the present invention, the pair of main antenna elements and the matching portion are both formed in a meander line shape, and the main antenna element has a pattern width as the whole meander line shape. Is preferably wider than the width of the auxiliary antenna element.

In the small antenna of the first aspect of the present invention, the auxiliary when the antenna element Oke as a slidable structure in the direction of the main antenna element, the proximal part of both ends of the auxiliary antenna elements are close to each main antenna electrode The gap, that is, the capacity of the matching adjustment capacitor can be adjusted. Such adjustment can be performed after the tag is manufactured. For example, it is an effective means for fine adjustment when the tag impedance changes depending on the material of the object to which the wireless tag is attached.

Further, the sliding movement in the direction of the main antenna element of the auxiliary antenna element, both ends or one end of the auxiliary antenna element into contact with the main antenna element, stops the operation of the wireless tag to deteriorate the antenna characteristics the Rukoto is, for example, it is possible to ensure security. Also, if the book has been purchased, the operation of the wireless tag attached to the book is turned off, and the operation of the wireless tag is turned on for the user's intention that the operation of the wireless tag is ON for the book that has not been purchased yet. / OFF can be freely set.

In the small antenna of the first aspect of the present invention, the auxiliary when the line width or length of the antenna elements keep a variable, both end portions gap clogging alignment adjustment of the near portion adjacent to the main antenna electrode of the auxiliary antenna element The capacity of the capacitor can be adjusted. Further, by changing the line width or length of the auxiliary antenna element, the auxiliary antenna element is brought into contact with the main antenna element, it is possible to stop the operation of the wireless tag to deteriorate the antenna characteristics. Thus by Rukoto stops the operation of the wireless tag, for example, it is possible to ensure security. Also, if the book has been purchased, the operation of the wireless tag attached to the book is turned off, and the operation of the wireless tag is turned on for the user's intention that the operation of the wireless tag is ON for the book that has not been purchased yet. / OFF can be freely set.

A small antenna according to a second aspect of the present invention includes a pair of main antenna elements formed at both ends of a dielectric substrate, an auxiliary antenna element formed between the pair of main antenna elements, and the pair of main antennas. A matching portion connected between the elements, and both ends of the auxiliary antenna element are close to the pair of main antenna elements, and the auxiliary antenna element is slidable in the direction of the main antenna element. It is characterized by being.
A small antenna according to a third aspect of the present invention includes a pair of main antenna elements formed at both ends of a dielectric substrate, an auxiliary antenna element formed between the pair of main antenna elements, and the pair of main antennas. A matching portion connected between the elements, and both ends of the auxiliary antenna element are close to the pair of main antenna elements, respectively, and the auxiliary antenna element has a line width or length of a conductor wire. Characterized by being variable.
The wireless tag according to the present invention includes any one of the first to third aspects of the small antenna and the IC chip according to the present invention, and the IC chip is connected to the matching portion of the small antenna. It is characterized by having .

According to the small antennas of the second aspect and the third aspect of the present invention, only a portion where both end portions of the auxiliary antenna element are close to the pair of main antenna elements is between the main antenna element and the auxiliary antenna element. Since it is a local proximity part and its proximity part is almost clearly separated, adjustment of antenna impedance (capacitance adjustment of the capacitor formed in the proximity part of the main antenna element and the auxiliary antenna element and the matching part Adjustment) can be performed independently of the size and shape of the main antenna element. Therefore, the main antenna element can be freely designed with gain priority.

Furthermore, in the small antenna according to the second aspect of the present invention, if the auxiliary antenna element is configured to be slidable in the direction of the main antenna element, both ends of the auxiliary antenna element are close to each main antenna electrode. It is possible to adjust the gap of the portion, that is, the capacity of the matching adjustment capacitor. Such adjustment can be performed after the tag is manufactured. For example, it is an effective means for fine adjustment when the tag impedance changes depending on the material of the object to which the wireless tag is attached. In addition, the sliding movement of the auxiliary antenna element in the direction of the main antenna element brings both ends or one end of the auxiliary antenna element into contact with the main antenna element, thereby degrading the antenna characteristics and stopping the operation of the wireless tag. For example, security can be ensured. Also, if the book has been purchased, the operation of the wireless tag attached to the book is turned off, and the operation of the wireless tag is turned on for the user's intention that the operation of the wireless tag is ON for the book that has not been purchased yet. / OFF can be freely set.
Furthermore, in the small antenna according to the third aspect of the present invention, if the line width or length of the auxiliary antenna element is made variable, both ends of the auxiliary antenna element are adjacent gaps adjacent to the main antenna electrodes, that is, The capacitance of the matching adjustment capacitor can be adjusted. Further, by changing the line width or length of the auxiliary antenna element and bringing the auxiliary antenna element into contact with the main antenna element, it is possible to degrade the antenna characteristics and stop the operation of the wireless tag. Thus, by stopping the operation of the wireless tag, for example, security can be ensured. Also, if the book has been purchased, the operation of the wireless tag attached to the book is turned off, and the operation of the wireless tag is turned on for the user's intention that the operation of the wireless tag is ON for the book that has not been purchased yet. / OFF can be freely set.

Wireless tag according to the present invention is provided with a one of a small antenna and an IC chip from the first embodiment according to the present invention described above to a third aspect (tag IC), the IC to the matching portion of the small antenna Since the chip is connected, the tag can be reduced in size while maintaining the gain, and impedance matching can be easily performed.

  Here, in the antenna described in Patent Document 1 (Japanese Patent Laid-Open No. 2002-141732), power is supplied to the antenna by an unbalanced method (a transmission method in which a potential difference from GND is applied to one signal line with reference to GND). The ground plate that supplies power does not operate as an antenna. In addition, since power supply is performed in an unbalanced manner, a balanced / unbalanced conversion unit such as a microstrip is required, and there is a disadvantage that radio waves are lost in the balanced / unbalanced conversion unit.

In contrast, (wireless tag with the any one of the small antenna and the IC chip from the first aspect of the present invention to the third aspect (tag IC)) wireless tag according to the present invention, the IC tag from the terminal to the antenna element is entirely possible to balanced transmission (transmission method of giving a potential difference to each of the line using two signal lines), the auxiliary antenna element be a not feed structure it can. Thus, the central portion of the auxiliary antenna element operates as an antenna, but just a certain, there is an advantage that the gain is improved. In addition, since the balanced transmission is possible, it is not necessary to provide a balanced / unbalanced conversion unit.

First aspect of the present invention, according to the small antenna of the second aspect and third aspect, the main antenna element are formed on both end portions of said dielectric substrate (both end portions of the tag), between the main antenna wherein with auxiliary antenna elements are formed, since the both end portions of the auxiliary antenna element has a structure close to each of the pair of main antenna elements, the adjustment of the antenna impedance (matching adjustment between the tag IC and the like), the It can be performed independently regardless of the size and shape of the main antenna element. Thus, the freely it is possible to design the main antenna elements in gain priority, it is possible to improve the gain. In addition, the antenna impedance can be adjusted to the optimum condition while maintaining the gain, and the matching loss can be reduced.
Furthermore, in the small antenna according to the second aspect of the present invention, if the auxiliary antenna element is configured to be slidable in the direction of the main antenna element, both ends of the auxiliary antenna element are close to each main antenna electrode. It is possible to adjust the gap of the portion, that is, the capacity of the matching adjustment capacitor. Such adjustment can be performed after the tag is manufactured. For example, it is an effective means for fine adjustment when the tag impedance changes depending on the material of the object to which the wireless tag is attached.
Furthermore, in the small antenna according to the third aspect of the present invention, if the line width or length of the auxiliary antenna element is made variable, both ends of the auxiliary antenna element are adjacent gaps adjacent to the main antenna electrodes, that is, The capacitance of the matching adjustment capacitor can be adjusted.
Furthermore, in the small antenna according to the second aspect of the present invention, both ends or one end of the auxiliary antenna element can be brought into contact with the main antenna element, the antenna characteristics can be degraded, and the operation of the wireless tag can be stopped. In the small antenna according to the third aspect of the present invention, the antenna characteristic is deteriorated by changing the line width or length of the auxiliary antenna element and bringing the auxiliary antenna element into contact with the main antenna element. Can be stopped.
In the small antennas according to the second and third aspects of the present invention, security can be ensured, for example, by stopping the operation of the wireless tag in this way. Also, if the book has been purchased, the operation of the wireless tag attached to the book is turned off, and the operation of the wireless tag is turned on for the user's intention that the operation of the wireless tag is ON for the book that has not been purchased yet. / OFF can be freely set.

In the small antenna according to the embodiment of the present invention, it is preferable that the main antenna element, the auxiliary antenna element, and the matching portion are formed on one side of the dielectric substrate. Thus, by forming the main antenna element, the auxiliary antenna element, and the matching portion on the same plane, the manufacture becomes easy and the production cost can be reduced. It is also possible to form the conductor line patterns of the main antenna element, the auxiliary antenna element, and the matching portion on a sheet-like object by printing.
In the small antenna according to the embodiment of the present invention, the conductor wire of the main antenna element is preferably formed in a meander line shape in order to reduce the size. The main antenna element may be a conductor wire having a bent pattern, or may be a conductor wire having a substantially triangular shape or a coil shape. The matching portion is also preferably a conductor wire formed in a meander line shape or a coiled conductor wire.
According to the small antenna according to the embodiment of the present invention, it is possible to freely design the main antenna element with gain priority. Therefore, the main antenna element can be designed to have a thick conductor line ( A meander pattern having a thick line width).
In the small antenna according to the embodiment of the present invention, a slot is formed in the auxiliary antenna element, and another tag IC is mounted in the slot, or power is supplied to the slot separately from the main antenna element. A slot antenna can be formed, and a single small antenna can be used to form a dual antenna capable of supporting two frequencies, for example, UHF (900 MHz band) and microwave (2.4 GHz band). It becomes possible.
In the small antenna according to the embodiment of the present invention, another electronic component may be mounted inside the auxiliary antenna element. Further, a slot may be formed in the auxiliary antenna element, and another electronic component may be mounted in the slot. Examples of the electronic component mounted in the slot include a semiconductor switch such as a PIN diode or other communication device such as Bluetooth.
Hereinafter, embodiments of the present invention will be described with reference to the drawings .
<Embodiment 1>
FIG. 1 is a plan view showing an example of a small antenna according to the present invention. FIG. 2 is a diagram illustrating an end view (a), a Zb-Zb line end view (b), and a Zc-Zc line end view (c) of FIG.

  In the small antenna AN of this example, a pair of left and right main antenna elements 1, 1, an auxiliary antenna element 2, and a pair of left and right matching portions 3, 3 are formed on one side of a dielectric substrate (for example, a glass epoxy substrate) 4. This is an antenna having a planar structure.

  The main antenna elements 1 and 1 are meander type antennas having conductor lines formed in a meander line shape, and are arranged on the dielectric substrate 4 symmetrically. The main antenna elements 1 and 1 occupy both end areas of the dielectric substrate 4, and the auxiliary antenna element 2 is disposed between the pair of left and right main antenna elements 1 and 1.

  Both end portions of the auxiliary antenna element 2 are arranged close to the inner end faces 11 and 12 of the main antenna elements 1 and 1, respectively, and this proximity portion is close to the main antenna elements 1 and 1 and the auxiliary antenna element 2. Parts 7 and 8.

  Each of the matching portions 3 and 3 is a conductor wire (inductor) formed in a meander line shape. One end portions of the matching portions 3 and 3 are connected to the inner end portions of the main antenna elements 1 and 1, respectively, and each other end portion of the matching portions 3 and 3 is mounted with an IC on which an IC chip such as a tag IC is mounted. It is part 5.

  Then, by mounting the tag IC 6 as shown in FIG. 3 on the IC mounting portion 5 at the other end of the matching portions 3 and 3 of the small antenna AN, a small wireless tag T0 can be realized. .

  According to the small antenna AN and the radio tag T0 of this example, the line width of the conductor wire of the main antenna elements 1 and 1 is large, and the main antenna elements 1 and 1 completely occupy both end areas of the dielectric substrate 4. Therefore, the gain can be increased as compared with the conventional structure shown in FIG.

  Further, the proximity of each main antenna element 1, 1 and auxiliary antenna element 2 is only the proximity portions 7, 8 at both ends of the auxiliary antenna element 2, and as shown in the equivalent circuit of FIG. Capacitors C formed in the proximity portions 7 and 8 in which the auxiliary antenna elements 2 are close to the main antenna elements 1 and 1 are almost clearly separated from the proximity of the elements 1 and 1 to the auxiliary antenna element 2. Since both the inductor L and the matching unit 3 are variable, the adjustment of the capacitor C and the inductor L, that is, the adjustment of the antenna impedance (matching adjustment with the tag IC or the like) is related to the size and shape of the main antenna elements 1 and 1. Can be done independently.

  Therefore, the main antenna elements 1 and 1 can be freely designed with gain priority. In addition, the antenna impedance can be adjusted to the optimum condition while maintaining a high gain, and the matching loss can be reduced.

<Embodiment 2>
In the above example, the auxiliary antenna element 2 is fixedly disposed on the dielectric substrate 4. However, as shown in FIG. 5, if the auxiliary antenna element 2 is configured to be slidable in the Y direction, both ends of the auxiliary antenna element 2 are arranged. It is possible to adjust the gap of the proximity portion 8 where the portion is close to the main antenna electrodes 1, 1, that is, the capacitance of the matching adjustment capacitor. Such adjustment can be performed after manufacture, and is an effective means for fine adjustment when the tag impedance changes depending on the material of the object to which the wireless tag is attached, for example.

  Also, by sliding the auxiliary antenna element 2 in the Y direction, both ends of the auxiliary antenna element 2 are brought into contact with the pair of main antenna elements 1 and 1 to degrade the antenna characteristics and stop the operation of the wireless tag T1. Therefore, it is possible to use such as ensuring security. Also, if the book has been purchased, the operation of the wireless tag attached to the book is turned off, and the operation of the wireless tag is turned on for the user's intention that the operation of the wireless tag is ON for the book that has not been purchased yet. / OFF can be freely set.

  The auxiliary antenna element 2 may be configured to be slidable in the X direction. In this case as well, the antenna characteristic is deteriorated by bringing one end of the auxiliary antenna element 2 into contact with the main antenna element 1 to operate the wireless tag. Can be stopped.

  As a specific example of the slide structure of the auxiliary antenna element 2, for example, the auxiliary antenna element 2 is formed of an individual metal plate, and a guide groove for slide guide is provided in the dielectric substrate 4 or the tag case (not shown). And a structure in which the auxiliary antenna element 2 is slid along the guide groove.

  The auxiliary antenna element 2 may have a structure that can change the line width or length of the conductor wire. If the line width of the auxiliary antenna element 2 is variable, the gap between the adjacent portions 8 where both ends of the auxiliary antenna element 2 are close to the main antenna electrodes 1, 1, that is, the matching adjustment capacitor, as in the slide structure described above. The capacity can be adjusted. Furthermore, by changing the line width or length of the auxiliary antenna element 2 and bringing the auxiliary antenna element 2 into contact with the main antenna element 1, it is possible to degrade the antenna characteristics and stop the operation of the wireless tag.

  As a specific example of the structure in which the line width or length of the auxiliary antenna element 2 is variable, for example, the auxiliary antenna element 2 is formed on a dielectric substrate and a fixed conductor line pattern formed on a dielectric substrate. A structure in which the line width or the length is changed by forming the overlapped movable metal plate and sliding the movable metal plate with respect to the solid conductor line pattern can be exemplified.

<Embodiment 3>
6 and 7 are plan views showing other examples of the wireless tag (small antenna) of the present invention.

  As shown in FIG. 6, a slot 21 is formed in the auxiliary antenna element 2, a switch (for example, a semiconductor switch such as a PIN diode) 22 is mounted in the slot 21, and the switch 22 is connected between both ends of the tag IC 6. You may keep it. If such a configuration is adopted, the wireless tag T2 operates in a normal state when the switch 22 is OFF, and the switch 22 is turned ON to short-circuit both ends of the tag IC 6 to operate the wireless tag T2. Can be stopped. Thus, by providing the switch 22 and stopping the operation of the wireless tag T2, for example, security can be ensured. Also, if the book has been purchased, the operation of the wireless tag attached to the book is turned off, and the operation of the wireless tag is turned on for the user's intention that the operation of the wireless tag is ON for the book that has not been purchased yet. / OFF can be freely set.

  In addition, as shown in FIG. 7, if a slot 21 is formed in the auxiliary antenna element 2 and another tag IC 23 is mounted in the slot 21, it is possible to configure two wireless tags in one product. One wireless tag T3 can be used as a tag capable of supporting two frequencies, for example, UHF (900 MHz band) and microwave (2.4 GHz band).

  If power is supplied to the slot formed in the auxiliary antenna, it is possible to form a slot antenna, and one small antenna, for example, UHF (900 MHz band) and microwave (2.4 GHz band) can be formed. A dual antenna capable of supporting two frequencies can be configured.

  Further, another electronic component may be mounted inside the auxiliary antenna element. Further, a slot antenna may be formed in the auxiliary antenna element, and another communication device such as Bluetooth may be mounted on the slot antenna.

<Embodiment 4>
In the example of FIGS. 1 and 3, the main antenna element 1 has a meander line pattern. However, the main antenna element 101 is not limited thereto, and may be a main antenna element 101 having a bent pattern as shown in FIG. In addition, as shown in FIG. 9, the main antenna element 111 may have a substantially triangular pattern in which the line width gradually increases toward the end of the dielectric substrate 4. Furthermore, the main antenna element may be a helical antenna having a shape in which a through hole is formed in the dielectric substrate 4 and the coil is wound using the through hole.

<Embodiment 5>
An example in the case where the electrical length of the matching portion is post-adjusted in the present invention is shown in FIGS.

  In the example of FIG. 10, the matching unit 31 has a pattern in which “C” is continuous (FIG. 10A), and one side or a plurality of sides of the “C” is cut by laser light irradiation or the like. This is a method of adjusting the electrical length of the matching section 31 (FIG. 10B).

  In the example of FIG. 11, the matching portion 32 is a pattern having a rectangular portion 33 (FIG. 11A), and a part of the rectangular portion 33 is removed by laser light irradiation or the like (FIG. 11A). This is a method of adjusting the electrical length of the matching section 32. In the example of FIG. 11, the electrical length of the matching portion 32 can be adjusted steplessly by appropriately setting the cut depth of the removal portion of the rectangular portion 33.

  The present invention can be effectively used when constructing an RFID system in various fields such as FA, logistics, and distribution.

It is a top view which shows an example of the small antenna of this invention. They are the end view (a) of the Za-Za line of FIG. 1, the end view (b) of the Zb-Zb line, and the end view of the Zc-Zc line. It is a figure which shows an example of the radio | wireless tag using the small antenna of FIG. FIG. 4 is an equivalent circuit diagram of the wireless tag in FIG. 3. It is a top view which shows the other example of the radio | wireless tag of this invention. It is a top view which shows another example of the radio | wireless tag of this invention. It is a top view which shows another example of the radio | wireless tag of this invention. It is a top view which shows another example of the radio | wireless tag of this invention. It is a top view which shows another example of the radio | wireless tag of this invention. It is explanatory drawing of an example of the method of adjusting the length of a matching part. It is explanatory drawing of the other example of the method of adjusting the length of a matching part. 1 is a diagram illustrating a basic configuration of an RFID system. It is a top view which shows an example of the conventional radio | wireless tag. It is a top view which shows the other example of the conventional radio | wireless tag. FIG. 15 is an equivalent circuit diagram of the wireless tag in FIG. 14.

Explanation of symbols

AN Small antenna T0 Wireless tag 1 Main antenna element 2 Auxiliary antenna element 3 Matching part 4 Dielectric substrate 5 IC mounting part 6 Tag IC
7, 8 Proximity 21 Slot 22 Switch 23 Tag IC

Claims (8)

  1. A pair of main antenna elements formed at both ends of the dielectric substrate; an auxiliary antenna element formed between the pair of main antenna elements; and a matching section connected between the pair of main antenna elements. And
    The pair of main antenna elements, the auxiliary antenna element, and the matching portion are formed on one side of the dielectric substrate,
    The auxiliary antenna element is provided at both ends near the side to which the matching portion of the pair of main antenna elements is connected,
    A small antenna, wherein the shape of both ends of the auxiliary antenna element is a shape along the shape of the pair of main antenna elements to which the matching portion is connected.
  2. L-shaped portions formed in an L-shape are provided facing each other on the side where the matching portion of the pair of main antenna elements is connected,
    2. The small antenna according to claim 1, wherein the shape of both ends of the auxiliary antenna element is a shape along the L-shaped portion of the pair of main antenna elements.
  3. The pair of main antenna elements and the matching portion are both formed in a meander line shape,
    The small antenna according to claim 1 or 2, wherein the main antenna element has a pattern width as a whole of the meander line shape wider than that of the auxiliary antenna element.
  4. The small antenna according to any one of claims 1 to 3 , wherein the auxiliary antenna element is slidable in the direction of the main antenna element.
  5. The small antenna according to any one of claims 1 to 3 , wherein the auxiliary antenna element has a variable width or length of a conductor wire.
  6. A pair of main antenna elements formed at both ends of the dielectric substrate; an auxiliary antenna element formed between the pair of main antenna elements; and a matching section connected between the pair of main antenna elements. And
    Both end portions of the auxiliary antenna element are close to the pair of main antenna elements,
    The small antenna according to claim 1, wherein the auxiliary antenna element is slidable in the direction of the main antenna element.
  7. A pair of main antenna elements formed at both ends of the dielectric substrate; an auxiliary antenna element formed between the pair of main antenna elements; and a matching section connected between the pair of main antenna elements. And
    Both end portions of the auxiliary antenna element are close to the pair of main antenna elements,
    A small antenna, wherein the auxiliary antenna element has a variable conductor line width or length.
  8. A wireless tag comprising the small antenna according to any one of claims 1 to 7 and an IC chip, wherein the IC chip is connected to the matching portion of the small antenna.
JP2004054078A 2004-02-27 2004-02-27 Small antenna and wireless tag provided with the same Expired - Fee Related JP4393228B2 (en)

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JP2006333194A (en) * 2005-05-27 2006-12-07 Toppan Forms Co Ltd Antenna member and its impedance adjusting method
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