JP3148057U - Flat antenna - Google Patents

Abstract

A flat antenna capable of reliably executing communication for reading or writing information with respect to a large number of RF tags with a simple one-piece configuration. A flat antenna includes an antenna substrate, a rectangular first flat conductor pattern, a second flat conductor pattern, and a rectangular flat plate disposed on the antenna substrate with a gap. The connection conductor pattern 5 that connects the ends of the first flat conductor pattern 3 and the second flat conductor pattern 4, and the first flat conductor pattern 3 and the second flat conductor pattern 4 on the opposite side of the connection conductor pattern 5 are provided. It has a pair of current supply parts 3a and 4a and a coupler part 7 that adjusts the impedance of the flat antenna 1 itself, and the gap part 6 is bounded on the first flat conductor pattern 3 and the second flat conductor pattern 4 by current supply. The vertical magnetic field distributed as follows is generated, and wireless communication is performed with the RF tag arranged on these. [Selection] Figure 1

Description

  The present invention relates to a flat antenna, and more particularly to a flat antenna that performs wireless communication with, for example, an RF tag constituting an RFID system.

  For example, in a field such as a library management system in a library or the like, wireless communication is performed between an RF tag “RFID (Radio Frequency Identification) tag” attached to a book or the like and a flat antenna placed on a book shelf, and further a reader A system has been put to practical use in which the tag information of an RF tag is read by a writer to manage access to a bookshelf of a large number of books.

  RFID systems using such RF tags, flat antennas, and reader / writers are widely applied in the fields of logistics of various goods, manufacturing fields such as factories that manufacture various goods, and the like.

  However, in the conventional field of flat antennas applied to such an RFID system, there is no flat antenna that can reliably perform communication for reading or writing information on a large number of RF tags with a simple one-piece configuration. There is no current situation.

  Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4 propose an antenna that can perform data communication with a single RF tag using an omnidirectional material.

The antennas of Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4 can communicate with a single RF tag, and can reliably perform data communication with a plurality of RF tags. It was not a thing.
JP 2007-18113 A Registered Utility Model No. 3138984 Registered Utility Model No. 3139442 Registered Utility Model No. 3139446

  The problem to be solved by the present invention is that there is no flat antenna that can reliably execute wireless communication for information reading or writing processing for a large number of RF tags with a simple one-piece configuration.

  A flat antenna according to the present invention includes an antenna substrate, and a first flat conductor pattern, a second flat conductor pattern, a first flat conductor pattern, and a second flat conductor arranged on the antenna substrate with a gap therebetween. A connection conductor pattern for connecting ends of the pattern, and a pair of current supply portions provided on the first flat conductor pattern and the second flat conductor pattern on the opposite side of the connection conductor pattern, and the pair of currents An elevational magnetic field distributed on the first flat conductor pattern and the second flat conductor pattern with a gap as a boundary is generated on the first flat conductor pattern and the second flat conductor pattern by supplying current through the supply section. The most important thing is that it is configured to perform radio communication with a plurality of RF tags arranged, in particular, a large number of RF tags arranged in the vertical direction. And butterflies.

  According to the first aspect of the present invention, an RF magnetic field is generated on the first flat conductor pattern and the second flat conductor pattern, the vertical magnetic field being distributed with the gap portion as a boundary, and the RF tag disposed on these, particularly, It is possible to provide a flat antenna capable of reliably performing wireless communication for reading or writing information on a large number of RF tags arranged in the vertical direction.

  According to the second aspect of the present invention, the first flat conductor pattern and the second flat conductor pattern having different rectangular areas have the structure of having the first flat conductor pattern and the second flat conductor pattern. An elevational magnetic field distributed on the 1st flat conductor pattern and the 2nd flat conductor pattern with the gap portion as a boundary is generated, and information on RF tags arranged on these, particularly a large number of RF tags arranged in the vertical direction It is possible to provide a flat antenna that can reliably perform wireless communication for reading or writing data.

  According to the invention of claim 3, the coupler portion is provided on the basis of a configuration in which a rectangular first flat conductor pattern and a second flat conductor pattern having different areas are provided, and a coupler portion separate from the antenna substrate is provided. By supplying the current through the pair of current supply portions, an elevation magnetic field distributed on the first flat conductor pattern and the second flat conductor pattern with the gap portion as a boundary is generated, and the RF tag disposed on these, in particular, It is possible to provide a flat antenna capable of reliably performing wireless communication for information reading or writing processing with respect to a large number of RF tags arranged in the vertical direction.

  According to the fourth aspect of the present invention, the coupler unit and the pair of currents are provided on the basis of the configuration in which the first flat conductor pattern and the second flat conductor pattern having the same area are provided, and the coupler unit is provided separately from the antenna substrate. By supplying an electric current through the supply unit, an elevation magnetic field distributed on the first flat conductor pattern and the second flat conductor pattern with the gap as a boundary is generated, and the RF tag disposed on these magnetic fields, particularly in the vertical direction It is possible to provide a flat antenna capable of reliably performing wireless communication for information reading or writing processing with respect to a large number of RF tags arranged in the network.

  According to the fifth aspect of the present invention, the coupler unit and the pair of current supply units are provided on the basis of the configuration in which the first flat conductor pattern and the second flat conductor pattern of the same area are provided and the coupler unit is provided on the antenna substrate. By supplying the current, a vertical magnetic field distributed on the first flat conductor pattern and the second flat conductor pattern with the gap as a boundary is generated, and RF tags arranged on these magnetic fields, particularly arranged in the vertical direction. It is possible to provide a flat antenna capable of reliably performing wireless communication for information reading or writing processing on a large number of RF tags.

  According to the invention of claim 6, based on the configuration having the rectangular rectangular first flat conductor pattern and the second flat conductor pattern with the same area, by supplying the current through the coupler unit and the pair of current supply units, An elevation magnetic field distributed on the first flat conductor pattern and the second flat conductor pattern with a gap as a boundary is generated, and for RF tags arranged on these, particularly a large number of RF tags arranged in the vertical direction A flat antenna capable of reliably performing wireless communication for information reading or writing processing can be provided.

  According to the invention of claim 7, based on a configuration including a rectangular first flat conductor pattern and a second flat conductor pattern having different areas, current supply through a coupler unit and a pair of current supply units, An elevation magnetic field distributed on the first flat conductor pattern and the second flat conductor pattern with a gap as a boundary is generated, and for RF tags arranged on these, particularly a large number of RF tags arranged in the vertical direction A flat antenna capable of reliably performing wireless communication for information reading or writing processing can be provided.

  An object of the present invention is to provide a flat antenna capable of reliably executing communication for reading or writing information on a large number of RF tags with a simple one-piece configuration.

  A flat antenna according to the present invention includes an antenna substrate, a rectangular first flat conductor pattern, a second flat conductor pattern, a first flat conductor pattern, a first flat conductor pattern, and a rectangular flat plate disposed on the antenna substrate with a gap therebetween. A connection conductor pattern for connecting ends of two flat conductor patterns, a first flat conductor pattern on the opposite side of the connection conductor pattern, a pair of current supply portions provided in the second flat conductor pattern, and a flat antenna itself Elevating magnetic field distributed on the first flat conductor pattern and the second flat conductor pattern with a gap as a boundary by current supply through the coupler section and a pair of current supply sections. And wirelessly between the RF tag disposed on the first flat conductor pattern and the second flat conductor pattern. And achieve the above object by constituting performing signal.

  Further, the flat antenna according to the present invention can be incorporated as various antennas such as a handy type, a partition embedded type, a built-in shelf type, and a stationary type.

  Hereinafter, a flat antenna according to an embodiment of the present invention will be described in detail.

Example 1
First, a theoretical description of the flat antenna 1 according to the first embodiment of the present invention will be given.

  As shown in FIG. 10, the flat antenna 1 according to the first embodiment includes a first flat conductor pattern 3 and a second flat conductor pattern 4 arranged on the antenna substrate 2 with a gap 6 provided therebetween, and end portions thereof. The connecting conductor pattern 5 is connected to each other, and the current supply portions 3a and 4a are provided on the side surfaces of the first flat conductor pattern 3 and the second flat conductor pattern 4 opposite to the connecting conductor pattern 5. The elliptical magnetic field stretched in the direction along the surfaces of the first flat conductor pattern 3 and the second flat conductor pattern 4 is generated by passing a current through the current supply portions 3a and 4a on the side surfaces, thereby generating a flat antenna. 1 is configured to activate the RF tag T (operate the IC chip of the RF tag T) by linking the magnetic field to the tag antenna of the RF tag T arranged on the 1.

  That is, as shown in FIG. 11, for example, in the second flat conductor pattern 4, a current flows from the current supply portion 4 a through the 21st flat conductor pattern 4 in the direction of the connection conductor pattern 5. When the conductor pattern 4 is viewed from the lateral direction, a circular magnetic field as shown in FIG. 12 is generated. As a result, the second flat conductor pattern 4 as a whole has an elliptical shape as shown in FIG. 13 when viewed from the lateral direction. A synthetic magnetic field having a shape is generated.

  More specifically, in the flat antenna 1 of the first embodiment, a 13.56 MHz AC power source output from a reader / writer (not shown) is used, and the first flat conductor pattern 3 and the second flat conductor pattern 3 are connected through the current supply units 3a and 4a. By passing a current through the flat conductor pattern 4, the current distribution of the first flat conductor pattern 3 and the second flat conductor pattern 4 is as shown in FIG. 14, and the first flat conductor pattern 3 and the second flat conductor pattern 4. And in the opposite direction.

  Thereby, the magnetic field distribution of the first flat conductor pattern 3 and the second flat conductor pattern 4 is as shown in FIG. 15, and the direction of the magnetic field is also opposite.

  On the gap 6, the direction of the magnetic field is perpendicular to the upper surface of the flat antenna 1.

  In the flat antenna 1 of the first embodiment, when the RF tag T is vertically arranged along the direction of current flow above the flat antenna 1 as shown in FIGS. 14 and 15, the first flat conductor pattern 3 Above the second flat conductor pattern 4, the magnetic fields generated by the first flat conductor pattern 3 and the second flat conductor pattern 4 are linked at right angles or substantially right angles with respect to the tag antenna of the RF tag T, so that the tag antenna And the RF tag T is in an operating (electromotive) state, and communication between the flat antenna 1 and the RF tag T can be performed wirelessly.

  On the other hand, above the gap portion 6, the magnetic fields generated by the first flat conductor pattern 3 and the second flat conductor pattern 4 with respect to the tag antenna are parallel to each other and are not linked, and the RF tag T is in an operating state. It will not turn and will not be able to communicate.

  From the above, in the flat antenna 1 according to the first embodiment, when the RF tag T is vertically arranged along the direction of current flow above the flat antenna 1, the first flat conductor pattern 3 and the second flat conductor are arranged. Communication is possible above the pattern 4 and communication is impossible above the gap 6.

  Next, a specific example of the flat antenna 1 according to the first embodiment will be described with reference to FIGS.

  As shown in FIG. 1, the flat antenna 1 according to the first embodiment is the same as a flat rectangular antenna substrate 2 formed of an insulating material and a gap 6 on the antenna substrate 2 with a gap 6 therebetween. A rectangular first flat conductor pattern 3 and second flat conductor pattern 4 having an area and made of a conductive material such as copper foil, and ends of the first flat conductor pattern 3 and the second flat conductor pattern 4. A pair of current supply portions provided on the connection conductor pattern 5 made of a conductive material such as a copper foil for connecting the first and second flat conductor patterns 3 and 4 on the opposite side of the connection conductor pattern 5. 3a, 4a, and a coupler unit 7 mounted on the antenna substrate 2 for adjusting impedance of the flat antenna 1 itself (not shown) on which a coil and a capacitor are mounted.

  Then, by supplying current from a reader / writer (not shown) through the coupler section 7 and the pair of current supply sections 3a and 4a, the gap 6 is distributed on the first flat conductor pattern 3 and the second flat conductor pattern 4 as a boundary. A plurality of RF tags T that generate an elevational magnetic field and are disposed on the first flat conductor pattern 3 and the second flat conductor pattern 4, in particular, perpendicular to the first flat conductor pattern 3 and the second flat conductor pattern 4. It is configured to perform wireless communication for information transmission with a number of RF tags T arranged in the direction.

  The first flat conductor pattern 3 is set to have the same area as the second flat conductor pattern 4.

  Next, a detailed configuration of the flat antenna 1 according to the first embodiment and a measurement experiment example of the strength of the generated magnetic field will be described.

  As the dimensions of the flat antenna 1 according to the first embodiment, for example, W270 × D285 (230) × H35 (10) (however, the parenthesis does not include the antenna portion, unit mm, and protrusion (BNC connector)) is given. be able to.

  As a device for measuring the strength of the magnetic field generated by the flat antenna 1, a long range reader / writer (V720 BC5D4) manufactured by OMRON Corporation, a demonstration application for evaluation (300 RF tag display version), and a magnetic field strength measuring instrument were adopted. .

Further, as a verification method, the coupler unit 7 was adjusted so that an optimum gain was obtained from the flat antenna 1 by the following two methods, and the magnetic field strength was measured.
(1) Measurement with zero RF tag (no load) on flat antenna (2) Measurement with 250 RF tags placed on flat antenna

  Furthermore, as the measurement position of the magnetic field strength, as shown by a dotted line in FIG. 2, the measurement was performed from 63 points (5 mm intervals) in the left-right direction (X-axis direction) and 1.5 cm from the flat antenna. In the Y-axis direction), three points were measured as indicated by dotted lines in FIG. During observation, no load was applied (only the magnetic field strength measuring device), and the measurement angle of the RF tag was perpendicular to the antenna surface.

  FIG. 3 mainly shows numerical values of changes in magnetic field strength when there is no load and when 250 RF tags are arranged. FIG. 4 shows a confirmation state of the dead space in the central portion and the entire surface of the flat antenna 1. FIG. 5 shows the standard of the reading range of the RF tag on the flat antenna 1 in a divided manner.

  From the above, the RF tag was detected in the entire area near the coupler portion 7 on the flat antenna 1, but the outside 20 mm range was not detected in the center portion, and the outside 40 mm range was detected in a place away from the coupler portion 7. It turned out not to. Further, the RF tag is detected only on the antenna, and the RF tag outside the antenna is not detected.

  The magnetic field measurement results in the case (1) described above are shown in FIGS. 6 and 7, and the magnetic field measurement results in the case (2) are shown in FIGS. From these drawings, it can be confirmed that even when 250 sheets are arranged, the flat magnetic field strength similar to that in the no-load state is maintained.

  According to the flat antenna 1 according to the first embodiment, the gap portion 6 is formed on the first flat conductor pattern 3 and the second flat conductor pattern 4 by supplying the current through the coupler portion 7 and the pair of current supply portions 3a and 4a. The RF tag T is generated on the first flat conductor pattern 3 and the second flat conductor pattern 4, particularly the first flat conductor pattern 3 and the second flat conductor pattern. Wireless communication for reading or writing information on a large number of RF tags T arranged in the direction perpendicular to the four planes can be reliably performed.

(Example 2)
Next, a flat antenna 1A according to Embodiment 2 of the present invention will be described with reference to FIGS. 16 to 18 as an example of incorporation into a handy type.

  In the flat antenna 1A of the second embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals. 16 is a front view of the flat antenna 1A, FIG. 17 is a plan view, and FIG. 18 is a side view.

  As shown in FIGS. 16 to 18, the flat antenna 1A according to the second embodiment is arranged with the antenna substrate 2 and the gap 6 between the antenna substrate 2 and the antenna substrate 2 as in the first embodiment. The rectangular first flat conductor pattern 3 and the second flat conductor pattern 4 having different areas, the connection conductor pattern 5 connecting the ends of the first flat conductor pattern 3 and the second flat conductor pattern 4, and the connection Impedance adjustment of the pair of current supply portions 3a and 4a provided on the first flat conductor pattern 3 and the second flat conductor pattern 4 on the opposite side of the conductor pattern 5 and the flat antenna 1A itself disposed on the antenna substrate 2 is performed. And a coupler unit 7 to perform.

  The first flat conductor pattern 3 is set to have a smaller area than the second flat conductor pattern 4.

  Then, by supplying current from a reader / writer (not shown) through the coupler section 7 and the pair of current supply sections 3a and 4a, the gap 6 is distributed on the first flat conductor pattern 3 and the second flat conductor pattern 4 as a boundary. A wireless communication for transmitting information to and from a large number of RF tags T arranged on the first flat conductor pattern 3 and the second flat conductor pattern 4 by generating an elevation magnetic field similar to that in the first embodiment. Is configured to do.

  According to the flat antenna 1A according to the second embodiment, as in the first embodiment, the first flat conductor pattern 3 and the second flat are supplied by current supply through the coupler section 7 and the pair of current supply sections 3a and 4a. An RF magnetic field T generated on the conductor pattern 4 with the gap 6 as a boundary is generated and disposed on the first flat conductor pattern 3 and the second flat conductor pattern 4, particularly the first flat conductor. Wireless communication for reading or writing information on a large number of RF tags T arranged in a direction perpendicular to the surfaces of the pattern 3 and the second flat conductor pattern 4 can be reliably performed. In addition, this handy antenna has a feature that the joint portion of the grip portion and the antenna portion is movable, and can be held over or inserted.

(Example 3)
Next, a flat antenna 1B according to Example 3 of the present invention will be described with reference to FIGS. 19 and 20 as an example of incorporation into a partition embedding type (for important document management).

  In the flat antenna 1B of the third embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals. 19 is a front view of the flat antenna 1B in which the coupler unit 7 is a separate configuration, and FIG. 20 is a side view of the coupler unit 7.

  As shown in FIGS. 19 and 20, the flat antenna 1A according to the third embodiment is arranged with the antenna substrate 2 and the gap 6 on the antenna substrate 2 as in the first embodiment. The rectangular first flat conductor pattern 3 and the second flat conductor pattern 4 having different areas, the connection conductor pattern 5 connecting the ends of the first flat conductor pattern 3 and the second flat conductor pattern 4, and the connection Impedance adjustment of the flat antenna 1B itself separately from the pair of current supply portions 3a and 4a provided on the first flat conductor pattern 3 and the second flat conductor pattern 4 on the opposite side of the conductor pattern 5 and the antenna substrate 2 And a coupler unit 7 for performing the above.

  On the antenna substrate 2 side, a connector 8 with the coupler portion 7 is provided. The coupler unit 7 also includes a connection receiving unit 7a for the connection tool 8, a connection receiving unit 7b for connection with a reader / writer (not shown), and detachable bracket plates 9, 10 and the like. 10 can be removed and attached to, for example, a shelf for books (not shown). The first flat conductor pattern 3 is set to have a larger area than the second flat conductor pattern 4.

  Then, by supplying current from a reader / writer (not shown) through the coupler section 7 and the pair of current supply sections 3a and 4a, the gap 6 is distributed on the first flat conductor pattern 3 and the second flat conductor pattern 4 as a boundary. An elevation magnetic field similar to that in the first embodiment is generated, and wireless communication for information transmission is performed with the RF tag T disposed on the first flat conductor pattern 3 and the second flat conductor pattern 4. It is configured as follows.

  According to the flat antenna 1B according to the third embodiment, as in the first embodiment, the first flat conductor pattern 3 and the second flat are supplied by supplying the current through the coupler section 7 and the pair of current supply sections 3a and 4a. An RF magnetic field T generated on the conductor pattern 4 with the gap 6 as a boundary is generated and disposed on the first flat conductor pattern 3 and the second flat conductor pattern 4, particularly the first flat conductor. Wireless communication for reading or writing information on a large number of RF tags T arranged in a direction perpendicular to the surfaces of the pattern 3 and the second flat conductor pattern 4 can be reliably performed.

(Example 4)
Next, a flat antenna 1C according to a fourth embodiment of the present invention will be described with reference to FIGS.

  In the flat antenna 1C of the fourth embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals. FIG. 21 is a front view of a flat antenna 1 </ b> C in which the coupler unit 7 is a separate configuration, and FIG. 22 is a side view of the coupler unit 7.

  As shown in FIGS. 21 and 22, the flat antenna 1 </ b> C according to the fourth embodiment is arranged with the antenna substrate 2 and the gap 6 on the antenna substrate 2 as in the first embodiment. The first flat conductor pattern 3 and the second flat conductor pattern 4 that are rectangular in the same area, the connection conductor pattern 5 that connects the ends of the first flat conductor pattern 3 and the second flat conductor pattern 4, and the connection Impedance adjustment of the flat antenna 1B itself separately from the pair of current supply portions 3a and 4a provided on the first flat conductor pattern 3 and the second flat conductor pattern 4 on the opposite side of the conductor pattern 5 and the antenna substrate 2 And the coupler unit 7 having the same configuration as that of the third embodiment.

  On the antenna substrate 2 side, a connector 8 with the coupler portion 7 is provided. The coupler unit 7 also includes a connection receiving unit 7a for the connection tool 8, a connection receiving unit 7b for connection with a reader / writer (not shown), and detachable bracket plates 9, 10 and the like. 10 can be removed and attached to, for example, a shelf for books (not shown).

  Then, by supplying current from a reader / writer (not shown) through the coupler section 7 and the pair of current supply sections 3a and 4a, the gap 6 is distributed on the first flat conductor pattern 3 and the second flat conductor pattern 4 as a boundary. An elevation magnetic field similar to that in the first embodiment is generated, and wireless communication for information transmission is performed with the RF tag T disposed on the first flat conductor pattern 3 and the second flat conductor pattern 4. It is configured as follows.

  According to the flat antenna 1C according to the fourth embodiment, as in the first embodiment, the first flat conductor pattern 3 and the second flat are supplied by supplying current through the coupler section 7 and the pair of current supply sections 3a and 4a. An RF magnetic field T generated on the conductor pattern 4 with the gap 6 as a boundary is generated and disposed on the first flat conductor pattern 3 and the second flat conductor pattern 4, particularly the first flat conductor. Wireless communication for reading or writing information on a large number of RF tags T arranged in a direction perpendicular to the surfaces of the pattern 3 and the second flat conductor pattern 4 can be reliably performed.

(Example 5)
Next, a flat antenna 1D according to a fifth embodiment of the present invention will be described with reference to FIGS. 23 and 24 as an example of incorporation into a stationary type (for magnetic recording medium management).

  In the flat antenna 1D of the fifth embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals. FIG. 23 is a front view of the flat antenna 1C, and FIG. 24 is a plan view of the flat antenna 1C.

  As shown in FIGS. 23 and 24, the flat antenna 1D according to the fifth embodiment is arranged with the antenna substrate 2 and the gap 6 between the antenna substrate 2 and the antenna substrate 2 as in the first embodiment. The first flat conductor pattern 3 and the second flat conductor pattern 4 that are rectangular in the same area, the connection conductor pattern 5 that connects the ends of the first flat conductor pattern 3 and the second flat conductor pattern 4, and the connection Impedance adjustment of the pair of current supply portions 3a and 4a provided on the first flat conductor pattern 3 and the second flat conductor pattern 4 on the side opposite to the conductor pattern 5 and the flat antenna 1 itself disposed on the antenna substrate 2 is performed. And a coupler unit 7 to perform.

  A connector 8 is provided on the coupler unit 7 side for connection with a reader / writer (not shown).

  Then, by supplying current from a reader / writer (not shown) through the coupler section 7 and the pair of current supply sections 3a and 4a, the gap 6 is distributed on the first flat conductor pattern 3 and the second flat conductor pattern 4 as a boundary. An elevation magnetic field similar to that in the first embodiment is generated, and wireless communication for information transmission is performed with the RF tag T disposed on the first flat conductor pattern 3 and the second flat conductor pattern 4. It is configured as follows.

  According to the flat antenna 1D according to the fifth embodiment, as in the first embodiment, the first flat conductor pattern 3 and the second flat are supplied by supplying the current through the coupler section 7 and the pair of current supply sections 3a and 4a. An RF magnetic field T generated on the conductor pattern 4 with the gap 6 as a boundary is generated and disposed on the first flat conductor pattern 3 and the second flat conductor pattern 4, particularly the first flat conductor. Wireless communication for reading or writing information on a large number of RF tags T arranged in a direction perpendicular to the surfaces of the pattern 3 and the second flat conductor pattern 4 can be reliably performed.

(Example 6)
Next, a flat antenna 1E according to Example 6 of the present invention will be described with reference to FIG. 25 as a symmetrical antenna shape example.

  In the flat antenna 1E of the sixth embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 25, the flat antenna 1D according to the sixth embodiment has an antenna substrate 2 similar to that in the first embodiment and the same area disposed on the antenna substrate 2 with a gap 6 therebetween. The rectangular first flat conductor pattern 11 and the second flat conductor pattern 12, the connection conductor pattern 13 connecting the ends of the first flat conductor pattern 11 and the second flat conductor pattern 12, and the connection conductor pattern 13, current supply portions 11 a and 12 a provided in adjacent portions of the first flat conductor pattern 11 and the second flat conductor pattern 12 on the side opposite to the first flat conductor pattern 12.

  The current supply units 11a and 12a circulate current supplied through a reader / writer and a coupler unit (not shown) to the first flat conductor pattern 11, the connection conductor pattern 13, and the second flat conductor pattern 12, thereby An elevation magnetic field similar to that in the first embodiment distributed on the 1 flat conductor pattern 11 and the second flat conductor pattern 12 with the gap 6 as a boundary is generated, and the first flat conductor pattern 11 and the second flat conductor pattern are generated. 12 is configured to perform wireless communication with the RF tag T arranged on the T 12.

  According to the flat antenna 1E according to the sixth embodiment, as in the first embodiment, the first flat conductor pattern is supplied with the current fed through the reader / writer and the coupler section (not shown) through the current supply sections 11a and 12a. 11. RF tag T arranged on the first flat conductor pattern 11 and the second flat conductor pattern 12 by circulating through the connecting conductor pattern 13 and the second flat conductor pattern 12, particularly the first flat conductor pattern 11. Wireless communication for reading or writing information on a large number of RF tags T arranged in a direction perpendicular to the surface of the second flat conductor pattern 12 can be reliably performed.

(Example 7)
Next, a flat antenna 1F according to Example 7 of the present invention will be described with reference to FIG.

  In the flat antenna 1F of the seventh embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 26, the flat antenna 1F according to the seventh embodiment has an antenna substrate 2 similar to the case of the first embodiment and an area disposed on the antenna substrate 2 with a gap 6 therebetween. Different rectangular first flat conductor pattern 21 and second flat conductor pattern 22, connection conductor pattern 23 connecting the ends of first flat conductor pattern 21 and second flat conductor pattern 22, and connection conductor pattern 23 And a pair of current supply portions 21 a and 22 a provided on the first flat conductor pattern 21 and the second flat conductor pattern 22 on the opposite side. The first flat conductor pattern 21 is set to have a larger area than the second flat conductor pattern 22.

  An embodiment in which a gap 6 is distributed as a boundary on the first flat conductor pattern 21 and the second flat conductor pattern 22 by supplying current from a reader / writer and a coupler unit (not shown) through a pair of current supply units 21a and 22a. A vertical magnetic field similar to that in the case of 1 is generated, and wireless communication for information transmission is performed with the RF tag T arranged on the first flat conductor pattern 21 and the second flat conductor pattern 22. It is composed.

  According to the flat antenna 1F according to the seventh embodiment, as in the first embodiment, a current supplied through a reader / writer (not shown) and a coupler unit is supplied to the first flat conductor pattern through the current supply units 21a and 22a. 21, the RF tag T disposed on the first flat conductor pattern 21 and the second flat conductor pattern 22, in particular, the first flat conductor pattern 21 by flowing through the connection conductor pattern 23 and the second flat conductor pattern 22. In addition, wireless communication for reading or writing information on a large number of RF tags T arranged vertically on the second flat conductor pattern 22 can be reliably performed.

  The flat antenna of the present invention can be widely applied as a communication antenna with an RF tag in, for example, a distribution management system for various articles in a factory, a warehouse, etc., a delivery article management system, a library management system in a library, etc.

It is a schematic plan view of the flat antenna which concerns on Example 1 of this invention. It is explanatory drawing which shows the measurement position of the magnetic field intensity in the flat antenna which concerns on the present Example 1. FIG. It is explanatory drawing which mainly shows a numerical value the state of a magnetic field intensity change at the time of no load in the flat antenna which concerns on the present Example 1, and when 250 RF tags are arrange | positioned. It is explanatory drawing which shows the confirmation part of the dead part in the center part on the flat antenna in the flat antenna which concerns on the present Example 1, and the whole surface. It is explanatory drawing which classifies and shows the standard of the reading range of RF tag on the flat antenna in the flat antenna which concerns on the present Example 1. FIG. It is a perspective view which shows magnetic field distribution on the flat antenna at the time of no load in the flat antenna which concerns on the present Example 1. FIG. It is a top view which shows the magnetic field distribution on the flat antenna at the time of no load in the flat antenna which concerns on the present Example 1. FIG. It is a perspective view which shows magnetic field distribution on a flat antenna when 250 RF tags in the flat antenna which concern on the present Example 1 are arrange | positioned. It is a top view which shows magnetic field distribution on a flat antenna when 250 RF tags in the flat antenna which concern on the present Example 1 are arrange | positioned. 3 is a schematic plan view for theoretically explaining the flat antenna according to the first embodiment. FIG. It is a schematic explanatory drawing which shows the electric current which flows into the 1st flat conductor pattern in the flat antenna which concerns on the present Example 1. FIG. It is a schematic explanatory drawing of the magnetic field produced | generated by the 1st flat conductor pattern in the flat antenna which concerns on the present Example 1. FIG. It is a schematic explanatory drawing of the synthetic magnetic field produced | generated by the 1st flat conductor pattern in the flat antenna which concerns on the present Example 1. FIG. It is a schematic explanatory drawing which shows the direction of the electric current which flows into the 1st flat conductor pattern in the flat antenna which concerns on the present Example 1, and a 2nd flat conductor pattern. It is a schematic explanatory drawing which shows the direction of the magnetic field which the 1st flat conductor pattern in the flat antenna which concerns on the present Example 1 and a 2nd flat conductor pattern produces | generate. It is a schematic plan view of the flat antenna which concerns on Example 2 of this invention. 6 is a schematic plan view of a flat antenna according to Example 2. FIG. 6 is a schematic plan view of a flat antenna according to Example 2. FIG. It is a schematic front view of the flat antenna of the coupler part separate structure which concerns on Example 3 of this invention. FIG. 6 is a schematic side view of a coupler unit according to a third embodiment. It is a schematic front view of the flat antenna of the coupler part separate structure which concerns on Example 4 of this invention. FIG. 6 is a schematic side view of a coupler unit according to a fourth embodiment. It is a schematic front view of the flat antenna which concerns on Example 5 of this invention. 10 is a schematic plan view of a flat antenna according to Example 5. FIG. It is a schematic plan view of the flat antenna which concerns on Example 6 of this invention. It is a schematic plan view of the flat antenna which concerns on Example 7 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flat antenna 1A Flat antenna 1B Flat antenna 1C Flat antenna 1D Flat antenna 1E Flat antenna 1F Flat antenna 2 Antenna board 3 1st flat conductor pattern 3a Current supply part 4 2nd flat conductor pattern 4a Current supply part 5 Connection conductor pattern 6 Gap Part 7 Coupler part 7a Connection receiving part 7b Connection receiving part 8 Connection tool 9 Bracket plate 10 Bracket plate 11 First flat conductor pattern 11a Current supply part 12 Second flat conductor pattern 12a Current supply part 13 Connection conductor pattern 21 First flat conductor Pattern 21a Current supply unit 22 Second flat conductor pattern 22a Current supply unit 23 Connection conductor pattern T RF tag

Claims (7)

The antenna substrate and the ends of the first flat conductor pattern and the second flat conductor pattern arranged on the antenna substrate with a gap therebetween are connected to the ends of the first flat conductor pattern and the second flat conductor pattern. A connection conductor pattern, a first flat conductor pattern opposite to the connection conductor pattern, a pair of current supply portions provided in the second flat conductor pattern,
Elevation magnetic fields distributed on the first flat conductor pattern and the second flat conductor pattern with a gap as a boundary are generated on the first flat conductor pattern and the second flat conductor pattern by current supply through the pair of current supply sections, and the first flat conductor pattern and the second flat conductor pattern are generated. A flat antenna characterized in that wireless communication is performed with an RF tag arranged on a conductor pattern. An antenna substrate, and a rectangular first flat conductor pattern, a second flat conductor pattern, a first flat conductor pattern, and a second flat conductor pattern having different areas arranged on the antenna substrate with a gap therebetween. A connection conductor pattern for connecting ends, a pair of current supply portions provided on the first flat conductor pattern and the second flat conductor pattern opposite to the connection conductor pattern, and a flat antenna disposed on the antenna substrate A coupler unit for adjusting the impedance of itself,
The first flat conductor pattern is generated on the first flat conductor pattern and the second flat conductor pattern by the current supply through the coupler section and the pair of current supply sections, and the first flat conductor pattern is distributed on the gap portion as a boundary. A flat antenna, characterized in that wireless communication is performed with an RF tag arranged on a second flat conductor pattern. An antenna substrate, and a rectangular first flat conductor pattern, a second flat conductor pattern, a first flat conductor pattern, and a second flat conductor pattern having different areas arranged on the antenna substrate with a gap therebetween. A connection conductor pattern for connecting the ends, a pair of current supply portions provided on the first flat conductor pattern and the second flat conductor pattern on the opposite side of the connection conductor pattern, and the antenna substrate are separate and flat. A coupler unit for adjusting the impedance of the antenna itself,
The first flat conductor pattern is generated on the first flat conductor pattern and the second flat conductor pattern by the current supply through the coupler section and the pair of current supply sections, and the first flat conductor pattern is distributed on the gap portion as a boundary. A flat antenna, characterized in that wireless communication is performed with an RF tag arranged on a second flat conductor pattern. An antenna substrate, and a rectangular flat first flat conductor pattern, a second flat conductor pattern, a first flat conductor pattern, and a second flat conductor pattern, which are disposed on the antenna substrate with a gap therebetween. A connection conductor pattern for connecting the ends, a pair of current supply portions provided on the first flat conductor pattern and the second flat conductor pattern on the opposite side of the connection conductor pattern, and the antenna substrate are separate and flat. A coupler unit for adjusting the impedance of the antenna itself,
The first flat conductor pattern is generated on the first flat conductor pattern and the second flat conductor pattern by the current supply through the coupler section and the pair of current supply sections, and the first flat conductor pattern is distributed on the gap portion as a boundary. A flat antenna, characterized in that wireless communication is performed with an RF tag arranged on a second flat conductor pattern. An antenna substrate, and a rectangular flat first flat conductor pattern, a second flat conductor pattern, a first flat conductor pattern, and a second flat conductor pattern, which are disposed on the antenna substrate with a gap therebetween. A connection conductor pattern for connecting ends, a pair of current supply portions provided on the first flat conductor pattern and the second flat conductor pattern opposite to the connection conductor pattern, and a flat antenna disposed on the antenna substrate A coupler unit for adjusting the impedance of itself,
The first flat conductor pattern is generated on the first flat conductor pattern and the second flat conductor pattern by the current supply through the coupler section and the pair of current supply sections, and the first flat conductor pattern is distributed on the gap portion as a boundary. A flat antenna, characterized in that wireless communication is performed with an RF tag arranged on a second flat conductor pattern. An antenna substrate and a rectangular flat first flat conductor pattern and a second flat conductor pattern arranged on the antenna substrate with a gap between them,
A connection conductor pattern connecting the ends of the first flat conductor pattern and the second flat conductor pattern, and a current supply section provided on the first flat conductor pattern and the second flat conductor pattern on the opposite side of the connection conductor pattern; Have
Elevation magnetic fields distributed on the first flat conductor pattern and the second flat conductor pattern with a gap as a boundary are generated on the first flat conductor pattern and the second flat conductor pattern by supplying current through the current supply section, and the first flat conductor pattern and the second flat conductor pattern A flat antenna, characterized in that it is configured to perform wireless communication with an RF tag disposed above. An antenna substrate, and a rectangular first flat conductor pattern, a second flat conductor pattern, a first flat conductor pattern, and a second flat conductor pattern having different areas arranged on the antenna substrate with a gap therebetween. A connection conductor pattern for connecting ends, a first flat conductor pattern opposite to the connection conductor pattern, a pair of current supply portions provided in the second flat conductor pattern,
Elevation magnetic fields distributed on the first flat conductor pattern and the second flat conductor pattern with a gap as a boundary are generated on the first flat conductor pattern and the second flat conductor pattern by current supply through the pair of current supply sections, and the first flat conductor pattern and the second flat conductor pattern are generated. A flat antenna characterized in that wireless communication is performed with an RF tag arranged on a conductor pattern.