JP4720348B2 - Antenna for RF-ID reader / writer device, RF-ID reader / writer device using the antenna, and RF-ID system - Google Patents

Antenna for RF-ID reader / writer device, RF-ID reader / writer device using the antenna, and RF-ID system Download PDF

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JP4720348B2
JP4720348B2 JP2005226460A JP2005226460A JP4720348B2 JP 4720348 B2 JP4720348 B2 JP 4720348B2 JP 2005226460 A JP2005226460 A JP 2005226460A JP 2005226460 A JP2005226460 A JP 2005226460A JP 4720348 B2 JP4720348 B2 JP 4720348B2
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antenna
rf
id
opening surface
multi
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JP2007043535A (en
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太志 出口
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パナソニック株式会社
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  The present invention uses an HF band (13.56 MHz band) frequency, an antenna for an RF-ID reader / writer device that communicates with a plurality of RF-ID tags, an RF-ID reader / writer device using the antenna, and an RF -Concerning the ID system.

  Conventionally, as an antenna for an RF-ID reader / writer device using a frequency in the HF band (13.56 MHz band), a single-turn or multiple-turn circular or rectangular loop antenna generally configured on the same plane Is in practical use.

  The loop antenna for the RF-ID reader / writer device has the highest magnetic field strength in the direction perpendicular to the opening surface S (the direction of the central axis). Therefore, the positional relationship between the loop antenna on the RF-ID tag side and the loop antenna for the RF-ID reader / writer device is generally arranged so that the opening surfaces S are parallel to each other.

  Further, even when communication with a plurality of RF-ID tags is performed, a plurality of RF-ID tags are arranged on the same plane so that the opening surfaces S do not overlap with each other, and the loop antenna for the RF-ID reader / writer device is arranged. The opening surfaces S are arranged in parallel.

  However, when the product is used for managing an extremely thin article such as a book management application or a CD / DVD management application, the book or CD / DVD case depends on the physical relationship between the size of the RF-ID tag and the thickness of the article. There was a problem that the RF-ID tag could not be pasted on the back cover of this. As a solution, a plurality of RF-ID tags are attached to the front cover or back cover of the managed article so that the center axes of the tag antennas coincide with each other at narrow intervals (article thickness + α). I had to.

  Also, when performing communication with a plurality of RF-ID tags arranged so as to overlap each other using a conventional one-turn or multiple-turn circular or rectangular loop antenna configured on the same common plane The number of tag readings is extremely small due to interference between tags, deviation of the antenna resonance frequency due to interference between the tag and the antenna for the reader / writer device, and basically distance attenuation of the magnetic field strength, and communication with all tags is impossible. There were drawbacks.

  Here, FIG. 14 is an explanatory view showing a conventional antenna for an RF-ID reader / writer device. As shown in FIG. 14 (a), in a one-turn or multiple-turn circular or rectangular loop antenna 101 configured on the same common plane, the magnetic field is most on the central axis Z of the opening surface S. FIG. 15 shows a change in the magnetic field strength at the point p due to an increase in the distance d when the strength is large and the distance between the point p on the central axis Z and the loop antenna 101 is d. From this, it can be seen that when the distance d increases, the magnetic field intensity attenuates and communication is not possible when the operating magnetic field Ht of the tag falls below. FIG. 15 is a graph showing changes in distance and magnetic field strength in the operating state of a conventional antenna for an RF-ID reader / writer device.

  As shown in FIG. 14B, it can be seen that the density of the magnetic flux 102 in this case becomes sparse as the distance d increases. When the tag is further than the distance d1 shown in FIG. 15, communication is not possible and the tag reading range is narrow.

Furthermore, the tag search device described in (Patent Document 1) will be described. FIG. 16 is a diagram for explaining a conventional tag search apparatus. In FIG. 16, the file 201 is managed by putting it in a folder 202 to which a tag 203 is attached. A coil 205 is provided in each tag 203 corresponding to a plurality of tags 203, and the drive circuit 204 is provided. It is devised to communicate sequentially. In this case, the width of the folder 202 and the tag 203 is wider than the thickness of the file 201, and there is a disadvantage that the number of storage is limited in the management of an extremely thin article such as a book management application or a CD / DVD management application. It was.
JP 7-182357 A

  As described above, in the conventional technique, in the use of managing an extremely thin article such as a book management application or a CD / DVD management application using an RF-ID tag, this drawback is a great obstacle with respect to the tag reading performance. . Specifically, there has been a management problem such as inputting a larger transmission power or intentionally shifting the central axis of the antenna between adjacent tags little by little.

  Therefore, the present invention provides an antenna for an RF-ID reader / writer device that can satisfactorily communicate with a plurality of RF-ID tags arranged at narrow intervals so as to overlap, an RF-ID reader / writer device using the antenna, and An object is to provide an RF-ID system.

In the antenna for the RF-ID reader / writer device of the present invention, a plurality of RF-ID tags on which a loop antenna having a first opening surface is formed are arranged close to each other in a straight line on the first surface, and the second opening surface. The plurality of RF-ID tags are arranged such that the central axis of the first opening surface is substantially parallel to the central axis of the second opening surface of the multi-winding loop antenna. The loop antenna is constituted by a plurality of antenna conductors and one less intersection, and each of the plurality of antenna conductors has a start point and an end point, and the second opening surface on three surfaces other than the second opening surface. Formed in parallel to the direction orthogonal to the central axis of the antenna, and arranged so that the distance between adjacent antenna conductors is narrower than the width of each antenna conductor, and the intersecting portion sandwiches the central axis of the second opening surface First side The second side on the opposite side, characterized in that connecting the one end point and the other of the start point of the adjacent antenna conductor.

  The RF-ID reader / writer device also includes the antenna for the RF-ID reader / writer device, supplies power and transmission data to the RF-ID tag by electromagnetic induction, and acquires received data from the RF-ID tag due to load fluctuations. It is characterized by doing.

Furthermore, the RF-ID system supplies a plurality of RF-ID tags formed with a loop antenna having a first opening surface, and supplies power and transmission data to the plurality of RF-ID tags by electromagnetic induction. A multi-turn loop antenna having a second opening surface connected to an RF-ID reader / writer device that acquires received data from the tag by load fluctuation , and the plurality of RF-ID tags are arranged at the center of the first opening surface. The multi-turn loop antenna has a plurality of antenna conductors and one less than that of the multi-turn loop antenna. The multi-turn loop antenna is arranged in a straight line so as to be substantially parallel to the central axis of the second opening surface of the multi-turn loop antenna. The plurality of antenna conductors each have a start point and an end point, and are formed in parallel to a direction orthogonal to the central axis of the second opening surface on three surfaces other than the second opening surface. The second antenna is disposed so that the interval between adjacent antenna conductors is narrower than the width of each antenna conductor, and the intersection is provided on the opposite side of the first surface across the central axis of the second opening surface. In this plane, one end point and the other start point of adjacent antenna conductors are connected .

  According to the present invention, it is possible to satisfactorily communicate with a plurality of RF-ID tags arranged at narrow intervals so as to overlap.

(Embodiment 1)
FIG. 1 is a perspective view showing an RF-ID system according to Embodiment 1 of the present invention. In FIG. 1, 1 is a multi-turn loop antenna, 2 is a housing, 3 is an RF-ID reader / writer device, and 4 is a coaxial cable. Further, 30 is an RF-ID tag, and 31 is a tag side antenna. In addition, S has shown the opening surface.

  As shown in FIG. 1, a multi-turn loop antenna 1 is an antenna for an RF-ID reader / writer device according to the present invention, and is housed in a resin housing 2. The multi-turn loop antenna 1 is connected to the RF-ID reader / writer device 3 through a coaxial cable 4.

  Then, the multi-turn loop antenna 1 connected to the RF-ID reader / writer device 3 supplies power and transmission data to the plurality of RF-ID tags 30 including the tag-side antenna 31 by electromagnetic induction. Received data from 30 is obtained by load fluctuation.

  Further, as shown in FIG. 1, the central axis AA ′ does not match the central axis AA ′ of the opening surface S of the multi-turn loop antenna 1 and does not pass through the opening surface S of the multi-turn loop antenna 1. The central axis BB ′ of the opening surface S of the tag-side antenna 31 of at least one (a plurality in the case of FIG. 1) RF-ID tag 30 with respect to the central axis BB ′ substantially parallel to “ A plurality of RF-ID tags 30 are arranged on a substantially straight line on the surface of the outer peripheral side surface of the multi-loop antenna 1 so as to coincide with each other.

  With such an arrangement, communication with all the RF-ID tags 30 on the outer peripheral side surface of the multi-loop antenna 1 can be realized.

  In the present invention, the multi-loop antenna 1 is used as the antenna for the RF-ID reader / writer device, the central axis AA ′ of the opening surface S, and the openings of the tag-side antennas 31 of the plurality of RF-ID tags 30. A plurality of RF-ID tags 30 which are arranged so as to overlap with each other by not aligning the central axis BB ′ of the surface S and disposing a plurality of RF-ID tags 30 on the opening surface S of the multi-turn loop antenna 1. Communication with the RF-ID tag 30 can be performed satisfactorily.

  The multi-turn loop antenna 1 will be described in more detail. FIG. 2 is a perspective view showing the antenna for the RF-ID reader / writer device according to the first embodiment of the present invention, and FIG. 3 is a bottom view showing the antenna for the RF-ID reader / writer device according to the first embodiment of the present invention. is there. 2 and 3 show details of a state in which the casing 2 of the multi-turn loop antenna 1 is removed. 2 and 3, 5 is an antenna substrate, 6 is an antenna conductor, 7 is a connector, 8 is a start end, 9 is a termination, 10 is a connection, 11 is a transmission line, and 12 is a resonance matching circuit. Show. Reference numeral 60 denotes an intersection.

  As shown in FIGS. 2 and 3, the multi-turn loop antenna 1 includes an antenna substrate 6 provided with an antenna conductor 6, and the antenna conductor 6 having a width W is wound at equal intervals P (n turns). is there. As shown in FIG. 3, each turn of the antenna conductor 6 is connected via an intersection 60. A transmission line 11 is provided between the start end 8 and the end end 9 of the multi-turn loop antenna 1, that is, between the start end 8 that is the start of winding of the antenna conductor 6 and the end end 9 that is the end of winding. In this configuration, a resonance matching circuit unit 12 including a resonance circuit unit and a matching circuit unit with the coaxial cable 4 is provided in the vicinity of one end or the middle point. Further, the other end of the transmission line 11 serves as a connection portion 10 with the termination portion 9. Furthermore, a connector 7 for connecting to the RF-ID reader / writer device 3 is provided at the end of the coaxial cable 4.

  Here, an insulator can be used for the antenna substrate 5, and for example, a resin flat plate such as a printed circuit board or polystyrene foam can be used. The antenna conductor 6 may be a metal (conductive) foil or a metal (conductive) thin plate. The intersection 60 can be the same as the antenna conductor 6. A covered electric wire can be used for the transmission line 11.

  As shown in FIG. 2, the antenna conductor 6 is parallel to a direction perpendicular to the central axis AA ′ of the opening surface S of the multi-loop antenna 1 on the other three surfaces other than the opening surface S. By adopting a multi-winding configuration, it is possible to make the magnetic field strength uniform within the reading range and to stabilize the communication performance.

  In addition, as shown in FIG. 2, the condition that the ratio of the width W and the interval P (pitch P) of the antenna conductor 6 constituting the multi-turn loop antenna 1 is W: P = 1: N (where N ≦ 1) is satisfied. By satisfying a horizontally long structure, the reading range length can be enlarged and thinned, and the magnetic field strength within the communicable range can be made uniform.

  As shown in FIG. 2, the relationship between the number of turns n of the antenna conductor 6 and the total length L, width W, and pitch P of the multi-turn loop antenna 1 exceeds the self-resonance point as the coil. By taking a non-finite value, it is possible to increase the reading range length, reduce the thickness, and improve the communication performance.

  Further, as shown in FIG. 3, a transmission line 11 such as a covered electric wire or a strip line is provided between the start end portion 8 and the end end portion 9 of the antenna conductor 6 constituting the multi-turn loop antenna 1, and the vicinity of one end thereof. Alternatively, by providing a resonance matching circuit unit 12 including a resonance circuit unit and a matching circuit unit with the coaxial cable 4 near the intermediate point, a magnetic field is efficiently radiated at a desired frequency, and a received load fluctuation is detected to perform communication performance. Realized the improvement.

  The multi-turn loop antenna 1 will be further described. FIG. 4 is a side view showing the antenna for the RF-ID reader / writer device according to the first embodiment of the present invention, and FIG. 5 is the RF-ID according to the first embodiment of the present invention. It is sectional drawing which shows the antenna for reader / writer apparatuses. Moreover, FIG. 6 is sectional drawing which shows the other example of the antenna for RF-ID reader-writer apparatuses in Embodiment 1 of this invention. In FIG. 4, the axis AA ′ is the central axis of the aperture surface S, the axes BB ′ and CC ′ do not coincide with the central axis AA ′, and the aperture surface S of the multi-turn loop antenna 1. An axis that does not pass through and is substantially parallel to the central axis AA ′ is shown. 5 and 6, ha and hd are the height of the opening surface S of the multi-turn loop antenna 1, wb and we are the width of the opening surface S of the multi-turn loop antenna 1, and T is the thickness of the antenna conductor 6. Indicates.

  The shape of the opening surface S of the multi-turn loop antenna 1 may be a substantially rectangular shape as shown in FIG. 5, or may be a substantially elliptical shape as shown in FIG.

  As shown in FIG. 5, the multi-loop antenna 1 has a flat structure in which the ratio between the height ha and the width wb of the opening surface S satisfies the condition of ha: wb = 1: N (where N ≧ 2). As a result, the antenna can be thinned.

  Further, as shown in FIG. 6, the ratio between the height ha and the width wb of the opening surface S of the multi-turn loop antenna 1 is flat so as to satisfy the condition of hd: we = 1: N (where N ≧ 2). With the structure, the antenna can be thinned.

  That is, as shown in FIGS. 5 and 6, the shape of the opening surface S of the multi-turn loop antenna 1 is rectangular or elliptical, and the ratio of the height h to the width w is h: w = 1: N ( However, the antenna can be thinned by adopting a flat structure that satisfies the condition of N ≧ 2).

  4 and 5, the ratio of the width wb of the opening surface S of the multi-turn loop antenna 1 to the total length L of the multi-turn loop antenna 1 is wb: L = 1: N (where N ≧ 2). ), The reading range length can be increased and the thickness can be reduced.

  That is, as shown in FIGS. 4 and 6, the ratio of the width we of the opening surface S of the multi-turn loop antenna 1 to the total length L of the multi-turn loop antenna 1 is we: L = 1: N (where N ≧ 2). ), The reading range length can be increased and the thickness can be reduced.

  That is, as shown in FIGS. 4 to 6, the ratio of the width w of the opening surface S of the multi-turn loop antenna 1 to the total length L of the multi-turn loop antenna 1 is w: L = 1: N (where N ≧ 2). ), The reading range length can be increased and the thickness can be reduced.

  7 is a top view showing the antenna for the RF-ID reader / writer device according to the first embodiment of the present invention, and FIG. 8 shows the antenna for the RF-ID reader / writer device according to the first embodiment of the present invention. It is a bottom view. 7 and 8 also show details of the state where the casing 2 of the multi-turn loop antenna 1 is removed. FIG. 8 shows a state in which the transmission line 11 and the resonance matching circuit unit 12 in the multi-turn loop antenna 1 are omitted.

  The method of winding the antenna conductor 6 will be described in detail. First, the antenna conductor 6 a is formed around the antenna substrate 5. As shown in FIG. 8, the antenna conductor 6 a ′ is formed from the starting end portion 8 on the bottom surface, and the antenna conductor 6 a having the surface as shown in FIG. 7 is formed from the antenna conductor 6 a ′. The antenna conductor 6b 'is connected to the antenna conductor 6b' through the intersection 60a to become the next antenna conductor 6b. Then, the winding is sequentially performed, and the antenna conductor 6e "is connected to the antenna conductor 6n 'via the intersecting portion 60e to be the next antenna conductor 6n, and n turns. At this time, the winding end portion of the antenna conductor 6 n ″ portion on the bottom surface becomes the termination portion 9. Thus, on the bottom surface, the gap 50 is provided between the antenna conductor 6a ′ (˜antenna conductor 6n ′) portion and the antenna conductor 6a ″ (˜antenna conductor 6n ″) portion, and the adjacent antenna conductor 6a. Between the antenna conductors 6n, there are intersections 60a to 60e. The intersections 60a to 60e are antenna conductors 6a '' (to antenna conductors 6e '') and antenna conductors 6b '(to antennas). Conductor 6n ') is connected.

  Therefore, as shown in FIGS. 2 to 8, the antenna conductor 6 constituting the multi-turn loop antenna 1 is composed of the antenna conductor 6 a that is the first winding (loop) and the second winding on at least one same surface. A certain antenna conductor 6b is connected from an intersection 60a, and an antenna conductor 6e that is an (n-1) th turn and an antenna conductor 6n that is an nth turn are provided with an intersection 60e.

  FIG. 9 is an explanatory diagram showing the magnetic field distribution in the operating state of the antenna for the RF-ID reader / writer device in the first embodiment of the present invention. Further, FIG. 10 is a graph showing changes in distance and magnetic field strength in the operating state of the antenna for the RF-ID reader / writer device according to Embodiment 1 of the present invention. FIG. 9 shows the state of the magnetic flux in FIG. 4, and FIG. 10 shows the point p due to the increase in the length L when the point p on the central axis BB ′ and the length of the multi-turn loop antenna 1 are L. The change of the magnetic field intensity of is shown. Reference numeral 13 denotes a magnetic flux, and it can be seen that the magnetic flux density is almost uniform in the range of the length L. In other words, with respect to the central axis BB ′, as shown in FIG. −B ′ is substantially matched, and a plurality of RF-ID tags 30 are arranged in a straight line on the outer peripheral side surface of the multi-turn loop antenna 1, so that these RF-ID tags 30 Is given a uniform magnetic field strength, and as shown in FIG. 10, it is possible to give a magnetic field strength larger than the tag operating magnetic field Ht determined by the size of the RF-ID tag 30 and the IC performance to be mounted. Realized tag reading range.

(Embodiment 2)
FIG. 11 is a perspective view showing an antenna for an RF-ID reader / writer device according to Embodiment 2 of the present invention, and FIG. 12 is a cross-sectional view showing the antenna for an RF-ID reader / writer device according to Embodiment 2 of the present invention. is there. 11 and 12, 14 is a magnetic material, and 51 is an antenna substrate.

  As shown in FIGS. 11 and 12, the antenna substrate 51 is filled with a magnetic material 14 having a high magnetic permeability and a low loss such as ferrite, thereby concentrating the magnetic flux, thereby realizing further reduction in thickness and size. In addition, the magnetic field is radiated more efficiently, the reception load fluctuation is detected, and the communication performance is further improved. As in the first embodiment, the antenna conductor 6 is parallel to a direction perpendicular to the central axis AA ′ of the opening surface S of the multi-turn loop antenna 1 on the other three surfaces other than the opening surface S. Thus, the magnetic field strength within the reading range can be made uniform and the communication performance can be stabilized.

  In this way, by filling the opening surface S of the multi-turn loop antenna 1 with the magnetic material 14 having a high magnetic permeability and a low loss such as ferrite, it is possible to reduce the thickness and size and to radiate the magnetic field more efficiently. Thus, it is possible to detect reception load fluctuations and further improve communication performance.

(Embodiment 3)
FIG. 13 is a perspective view showing an RF-ID system according to the third embodiment of the present invention. In FIG. 13, 15 is a support base, and 20 is a managed article.

  As shown in FIG. 13, in the application example of the present invention, a predetermined position on the cover surface of the management article 20 having a very small thickness such as CD or DVD (the central axis BB ′ shown in FIGS. 1, 4 and 9). The RF-ID tag 30 is affixed to the loop antenna 1 so as to communicate with the multi-turn loop antenna 1.

  In the first to third embodiments described above, the multi-turn loop antenna 1 is a metal plate or the like except for the communication direction so that communication characteristics such as impedance can be adjusted in advance for the purpose of avoiding the influence of external metal. It may be covered with.

  By adopting such a flat, flat, multi-turn loop antenna 1, a wide tag reading range is realized for a plurality of tags superimposed at a narrow interval. As a result, even if the RF-ID tag cannot be attached to the back cover of a book or CD / DVD case, such as for managing an extremely thin article such as a book management application or a CD / DVD management application, the front cover surface or back cover surface Communication with the RF-ID tag affixed to was enabled.

  The antenna for an RF-ID reader / writer device of the present invention, the RF-ID reader / writer device using the antenna, and the RF-ID system require a wide tag reading range for a plurality of tags stacked at a narrow interval. , An antenna for an RF-ID reader / writer device that communicates with a plurality of RF-ID tags using a frequency in the HF band (13.56 MHz band), an RF-ID reader / writer device using the antenna, and an RF-ID system It can be applied to other uses.

The perspective view which shows the RF-ID system in Embodiment 1 of this invention The perspective view which shows the antenna for RF-ID reader-writer apparatuses in Embodiment 1 of this invention The bottom view which shows the antenna for RF-ID reader-writer apparatuses in Embodiment 1 of this invention The side view which shows the antenna for RF-ID reader-writer apparatuses in Embodiment 1 of this invention Sectional drawing which shows the antenna for RF-ID reader-writer apparatuses in Embodiment 1 of this invention Sectional drawing which shows the other example of the antenna for RF-ID reader-writer apparatuses in Embodiment 1 of this invention The top view which shows the antenna for RF-ID reader-writer apparatuses in Embodiment 1 of this invention The bottom view which shows the antenna for RF-ID reader-writer apparatuses in Embodiment 1 of this invention Explanatory drawing which shows magnetic field distribution in the operation state of the antenna for RF-ID reader-writer apparatuses in Embodiment 1 of this invention The graph which shows the change of the distance and magnetic field intensity in the operation state of the antenna for RF-ID reader-writer apparatuses in Embodiment 1 of this invention The perspective view which shows the antenna for RF-ID reader-writer apparatuses in Embodiment 2 of this invention Sectional drawing which shows the antenna for RF-ID reader-writer apparatuses in Embodiment 2 of this invention The perspective view which shows the RF-ID system in Embodiment 3 of this invention Explanatory drawing which shows the antenna for the conventional RF-ID reader / writer apparatus The graph which shows the change of the distance and magnetic field intensity in the operation state of the antenna for conventional RF-ID reader-writer apparatuses The figure explaining the conventional tag search device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multi-winding loop antenna 2 Case 3 RF-ID reader / writer apparatus 4 Coaxial cable 5 Antenna board 6 Antenna conductor 7 Connector 8 Start end part 9 End part 10 Connection part 11 Transmission line 12 Resonance matching circuit part 13 Magnetic flux 14 Magnetic material 15 Support Stand

Claims (3)

  1. A plurality of RF-ID tags formed with a loop antenna having a first opening surface;
    Multi having ID is connected to the reader writer device the second opening surface - supplying transmit data and power by electromagnetic induction to the plurality of RF-ID tag, the RF to obtain the load fluctuation of the received data from the RF-ID tag A winding loop antenna, and
    The plurality of RF-ID tags are arranged close to each other in a straight line on the first surface so that the central axis of the first opening surface is substantially parallel to the central axis of the second opening surface of the multi-loop antenna. And
    The multi-turn loop antenna is composed of a plurality of antenna conductors and one less crossing portion,
    Each of the plurality of antenna conductors has a start point and an end point, and is formed on three surfaces other than the second opening surface in parallel to a direction orthogonal to the central axis of the second opening surface, and adjacent to the antenna. Arranged so that the distance between the conductors is narrower than the width of each antenna conductor,
    The intersecting portion has one end point and the other start point of the adjacent antenna conductors on a second surface provided opposite to the first surface across the central axis of the second opening surface. An RF-ID system characterized by being connected .
  2. A plurality of RF-ID tags formed with a loop antenna having a first opening surface are arranged close to each other in a straight line on the first surface,
    A multi-loop antenna having a second aperture surface;
    The plurality of RF-ID tags are arranged such that a central axis of the first opening surface is substantially parallel to a central axis of a second opening surface of the multi-turn loop antenna,
    The multi-turn loop antenna is composed of a plurality of antenna conductors and one less crossing portion,
    Each of the plurality of antenna conductors has a start point and an end point, and is formed in parallel to a direction orthogonal to the central axis of the second opening surface on three surfaces other than the second opening surface, and adjacent to the antenna Arranged so that the distance between the conductors is narrower than the width of each antenna conductor,
    The intersecting portion has one end point and the other start point of the adjacent antenna conductors on a second surface provided opposite to the first surface across the central axis of the second opening surface. RF-ID reader writer device antenna, characterized in that connected.
  3. An antenna for an RF-ID reader / writer device according to claim 2 , wherein power and transmission data are supplied to the RF-ID tag by electromagnetic induction, and received data is acquired from the RF-ID tag due to load fluctuations. RFID reader / writer device.
JP2005226460A 2005-08-04 2005-08-04 Antenna for RF-ID reader / writer device, RF-ID reader / writer device using the antenna, and RF-ID system Expired - Fee Related JP4720348B2 (en)

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