KR101021934B1 - Folded Dipole Antenna For RFID Handheld Reader - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folded dipole antenna for a handheld RFID reader, wherein the folded dipole antenna is separated from a patch type that is a consistent antenna form of a conventional RFID reader. It reduces the weight of the patch-type antenna by more than 80%, and reduces the antenna size of 100mm × 100mm that requires minimum guarantee for the patch-type antenna by 30% or more by 60% × 80mm. In addition to the improved mobility (mobility) of the reader, the usability and convenience of the end-user (End-User) has been greatly increased through lighter weight and smaller size. This contributes to the reduction of the size of the RFID handheld reader to be developed in the future and to the improvement of the application of RFID.

RFID, Tag, Handheld, Reader, Folded Dipole Antenna, Beam Control Board, Recognition Rate, Receiving Rate

Description

Folded Dipole Antenna For RFID Handheld Reader

The present invention relates to an antenna of a handheld type RFID reader, and more particularly, a folded dipole for an RFID handheld reader that recognizes and records RFID tag information using a 900 MHz band. ) Relates to an antenna.

In general, in the case of a handheld reader for recognizing an RF signal in a 900 MHz band, an RF tag is transmitted and received using a patch type antenna having a size of 100 mm × 100 mm, and information of an RFID tag Recognize and record. When using a patch-type RFID antenna, the recognition sensitivity of the RF wave is low by using a patch-type antenna characteristic and the size must be maintained above a certain size. Can achieve existing goals.

However, in the case of a patch-type antenna, when the size is smaller, not only the tag recognition distance is reduced but also it is likely to exceed the current radio wave limit limited to 1W (watts) (= 30 dB) in Korea to secure the recognition distance. To manufacture a patch type antenna, it takes more weight than necessary by using materials such as ceramic or Teflon.

The technical problem to be solved by the present invention is to reduce the weight of the RFID antenna, to reduce the size and to reduce the RFID of the antenna to ensure the portability, stability, convenience and mobility of the main features of the portable RFID reader The present invention provides a folded dipole antenna for an RFID handheld reader that can increase tag recognition sensitivity and thereby recognize a large number of tags.

In addition, another technical problem to be achieved by the present invention is to produce a form of the RFID antenna mounted on the RFID handheld reader in the form of X-shaped cross-folded dipole (Cross Folded Dipole) to form a radio wave radiation form of the antenna (Circular polarization) The present invention provides a folded dipole antenna for an RFID handheld reader that can greatly increase the directivity and reception sensitivity of the antenna by enabling transmission in a polarization format.

In addition, another technical problem to be achieved by the present invention is to compensate for the weakness of the large size (100 mm × 100 mm) and the weight according to the conventional patch-type antenna, the dipole type antenna at a 90 degree angle The company provides a folded dipole antenna for RFID handheld readers that folds more than once to increase the recognition area of radio waves coming from tags.

In addition, another technical problem to be achieved by the present invention is to increase the ground area of the RFID antenna in order to increase the transmit and receive rate for the radio wave transmitted from the tag, but the specific size (60) By folding the base substrate other than ㎜ × 80㎜ in the backward direction, the recognition rate of the received radio waves can be increased by using a large ground area, and the antenna base substrate folded in the backward direction can be used through the RFID antenna. The aim of the present invention is to provide a folded dipole antenna for RFID handheld readers by narrowing the direction of propagation of the transmitted radio waves so that radio waves can reach farther and recognize tag data at a distance (after about 3 m).

In addition, another technical problem to be achieved by the present invention is an RFID hand capable of recognizing a number of 1: (a number of tags in a single recognition) from a conventional 1: 1 (1 barcode in a single recognition) barcode recognition. To provide a folded dipole antenna for a handheld reader.

In addition, another technical problem to be achieved by the present invention is RFID handheld (Hendheld) that can meet the requirements of low weight and small size, which is essential for the application of the RFID industry and ensure a high recognition rate and recognition distance It is to provide a folded dipole antenna for the reader.

As a means for solving the above technical problem, the invention according to claim 1, the dipole substrate mounting portion for mounting the folded dipole substrate is located in the center portion, the beam control plate mounting portion for mounting the beam control plate in four directions A base substrate positioned at an edge portion and reflecting radio waves forward; The dipole substrate mounting portion formed on the front surface of the base substrate is alternately mounted in an X-shape cross folded dipole type, and radiates radio waves in two orthogonal directions to generate a circular polarization waveform. Inducing two dipole substrates; And "a" shaped beam control plates mounted in slots of the beam control plate mounting portions formed at rear edges of the base substrate to improve directivity of the beam pattern.

In the invention described in claim 2, the dipole elements each of which is bent at least twice at 90 degrees on both sides of the dipole substrate are formed. The invention according to claim 3 alternates the dipole substrates in an X-shape. It is characterized in that the fitting groove is formed symmetrically in the center to be mounted.

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The invention according to claim 4, wherein the beam control plate is formed by integrally forming a support portion protruding on one side of the projection to be fitted to the beam control plate mounting portion and the bent portion vertically bent in the longitudinal direction on the other side of the support portion, claim 5 The invention described in the above is that the beam control plate has a shape in which both edge portions of the bent portion are cut in a range of 2 ° to 45 °.

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In the invention described in claim 6, the beam control plate is composed of a copper plate, and in the invention according to claim 7, the base substrate of the antenna has a size of about 80 mm x 60 mm.

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According to the present invention, the weight of the patch-type antenna is increased by mounting a folded dipole type antenna on the RFID handheld reader by removing a consistent antenna type (patch type) of the existing RFID handheld reader. An increase in mobility of RFID handheld readers is achieved by reducing the antenna size of 100 mm x 100 mm by more than 30% and reducing the antenna size from 100 mm x 100 mm to 60 mm x 80 mm. Of course, it is possible to greatly increase the usability and convenience of the end-user through light weight and miniaturization. This contributes to the reduction of the size of the RFID handheld reader to be developed in the future and to the improvement of the application of RFID.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example

1 to 11 show a folded dipole antenna for an RFID handheld reader according to a preferred embodiment of the present invention.

First, Figure 1 is a view showing a base substrate of the antenna mounted to the RFID handheld reader in accordance with the present invention, (a) shows the back surface 11 of the base substrate 10 and (b) the base The front surface 18 of the substrate 10 is shown.

In the center portion of the base substrate 10 of the antenna, there are X-shaped dipole substrate mounting portions 12 and 13 on which the dipole substrates (20 and 30 in FIGS. 2 and 3) of the antenna are mounted. In the portion, the beam control plate mounting portion 14 to which the beam control plate (40, 50, 60 of Figs. 4 to 6) having a function of adjusting the beam pattern through the reduction of the radiation angle of the RF radio waves is located. The beam throttle mount 14 is a slot into which the projection of the beam throttle can be fitted. A printed circuit pattern 16 is formed on the rear surface 11 of the base substrate 10 of the antenna, and via holes 17 are formed in the dipole substrate mounting portions 12 and 13.

The base substrate 10 of the antenna according to the present invention is preferably formed in a size of about 80 mm x 60 mm. Increasing the size of the base substrate 10 of the antenna by 100 mm × 100 mm or more may increase the reception sensitivity and the transmission distance of the radio wave. However, in the present invention, the weight of the antenna is reduced in consideration of the requirements of the end-user. And integrated technology for miniaturization. In addition, by increasing the unit area of the base substrate 10 by folding the base substrate 10 of the antenna, the beam pattern of transmission and reception radio waves is improved to maximize the recognition distance of the RFID tag.

2 and 3 illustrate a first dipole substrate 20 and a second dipole substrate 30 in which a folded dipole form is coupled to each other at right angles in the antenna of the present invention. (a) shows the front surfaces 21 and 31 of the substrate, and (b) shows the rear surfaces 24 and 34 of the substrate.

The first dipole substrate 20 and the second dipole substrate 30 are X-shaped by the fitting grooves 25 and 35, and then the dipole substrate mounting portion 12 formed on the front surface 18 of the base substrate 10. (13) are cross-mounted in the form of X-shaped cross folded dipoles, and the function of inducing circular polarization waveforms by radiating radio waves in two orthogonal directions at ± 45 ° Do it.

As shown in FIGS. 2 and 3, the first dipole substrate 20 and the second dipole substrate 30 have dipole elements 22 and 32 bent at least two times at 90 degree angles on both sides thereof. And the dipole elements 22 and 32 are connected to the dipole substrate mounting portions 12 and 13 of the base substrate 10 through slightly protruded feed surfaces 23 and 33.
In addition, the two dipole substrates 20 and 30 are formed with symmetrical fitting grooves 25 and 35 in the center thereof so as to be alternately mounted in an X shape.

In the present invention, the dipole elements 22 and 32 are bent twice at a 90 degree angle to be applied in a folded dipole form to maximize the RF transmission and reception sensitivity of the antenna, and the two dipole substrates 20 and 30 are alternately disposed. Thus, the polarization of the transmitted and received RF radio waves is made possible for circular polarization, thereby increasing the reach of the radio waves that can be recognized. The dipole substrates 20 and 30 are mounted on the dipole substrate mounting portions 12 and 13 of the base substrate 10, and 24 in FIG. 2 and 34 in FIG. 3 show rear surfaces of the dipole substrates 20 and 30, respectively. .

4 to 6 illustrate beam control plates 40, 50, and 60 connected to edges of the base substrate 10 of FIG. 1, and FIG. 4 shows a lower side mounted to a slot of the lower end of the base substrate 10. 5 is an upper beam control plate 50 mounted in a slot of an upper end of the base substrate 10, and FIG. 6 is a side beam control plate mounted on left and right sides of the base substrate 10. 60). When all of the beam control plates 40, 50, and 60 are mounted, the base substrate 10 as a whole has the appearance of being folded twice behind the RFID antenna.

The beam control plates 40, 50, and 60 are mounted in slots of the beam control panel mounting portion 14 formed at the edge of the rear surface 11 of the base substrate 10, respectively, and serve to adjust the beam pattern radiated forward.

The beam control plates 40, 50, and 60 have support parts 42, 52, 62 and protrusions 41, 51, and 61 having protrusions 41, 51, and 61, which are inserted into the slots of the beam control plate mounting part 14, protruding from one side thereof, The other side of the 42, 52, 62 has a bent portion (43, 53, 63) vertically bent in the longitudinal direction integrally formed "a" shaped. Here, the bent portions 43, 53, and 63 of the beam control plates 40, 50, and 60 may have a shape in which both edge portions 44, 54, and 64 are cut in a range of 2 ° to 45 °. When the edges of the bent portions 43, 53 and 63 were cut in the range of 2 ° to 45 °, the experiments confirmed that the antenna's directivity was improved and the reception sensitivity and data recognition rate were maximized.

On the other hand, the bent portion (43, 53, 63) it is preferable that the cut shape of the corners (44, 54, 64) of both ends has a round shape of the curved surface, it may be cut in a straight form.

Through the mounting of the beam control plate (40, 50, 60) of Figures 4 to 6 can narrow the radiation angle of the RF radio wave when transmitting the RF radio waves to further improve the distance the RF radio waves reach, so that the RFID tag located at a far distance It is possible to increase the recognition rate for recognizing data stored in the.

FIG. 7 is a diagram illustrating a state in which a dipole substrate and a beam control plate are mounted on a base substrate of an antenna according to the present invention at different angles, and FIGS. 8 to 11 are photographs showing a physical example of a folded dipole antenna according to the present invention. to be.

As described above, the present invention induces a circular polarization waveform by fabricating the form of the RFID antenna mounted on the RFID handheld reader in the form of an X (cross) cross folded dipole. For example, it can be changed into antenna type for low weight and small size, which is essential for the RFID industry, and can increase recognition rate and improve recognition distance.

The cross-folded dipole type RFID antenna included in the present invention has the efficiency of 1: 1 (1 barcode per 1 barcode) recognition of a conventional barcode (Barcode). Among the various types of RFID antennas in the RFID field applied for the recognition of a large number of tags, it is manufactured in a completely different form to compensate for the weakness of the patch type antennas generally applied to RFID handheld readers.

In addition, to compensate for the large size (100mm × 100mm) of the patch-type antenna and the weakness of the weight according to the material, the recognition distance of the radio wave from the tag is bent by bending the dipole elements 22 and 32 at a 90 degree angle two or more times. In order to improve the directivity of the antenna and improve the reception sensitivity, the dipole antenna is manufactured in an X-shape so that the radio wave radiation shape of the antenna can be transmitted in the form of circular polarization.

In addition, in order to increase the forward / receive rate of radio waves transmitted from tag, base board other than specific size (600mm × 800mm) is enlarged to increase the ground of RFID antenna. By folding the antenna in the rearward direction, not only the reception sensitivity of the radio wave is increased by using a wide ground size, but also the narrowing direction of the radio wave transmitted through the RFID antenna due to the antenna base substrate 10 folded in the rearward direction is reduced. Radio waves reach farther and can recognize tag data of long distance (after about 3M).

The method of folding the base substrate 10 of the antenna according to the present invention in the rear direction is as follows. The beam control plates 40, 50, and 60 may also be referred to as extension regions of the base substrate 10. In the antenna, the base substrate 10 serves to reflect in the forward direction unwanted radio waves exiting the antenna in the back direction. However, since the size of the antenna is also increased as the base substrate 10 becomes larger, the folded dipole antenna according to the present invention extends the base substrate 10 of the antenna and folds the copper plate in the shape of "a" to form a base substrate. And the extension part acts as a base substrate.

The difference in recognition rate when the base substrate 10 of the antenna is folded in the rear direction can be seen from the beam pattern that emits radio waves of the antenna, as shown in FIG. 12. In FIG. 12, a portion indicated by "a" is a beam pattern when there is no beam control plate, and a portion denoted by "b" is a beam pattern when the beam control plate is mounted. It can be seen that 40, 50 and 60 serve to improve the beam pattern in the forward direction by reducing unwanted propagation to the rear.

Preferred embodiments of the present invention described above are disclosed to solve the technical problem, and those skilled in the art to which the present invention pertains (man skilled in the art) various modifications, changes, additions, etc. within the spirit and scope of the present invention. It will be possible, and such modifications and changes should be considered to be within the scope of the following claims.

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1 is a view showing a base substrate of an antenna according to the present invention mounted on an RFID handheld reader,

2 shows a first dipole substrate of an antenna according to the invention,
3 shows a second dipole substrate of an antenna according to the invention,
4 is a view showing a lower beam control plate mounted on the lower edge of the base substrate of the antenna according to the present invention;
5 is a view showing an upper beam control plate mounted to the upper edge of the base substrate of the antenna according to the present invention;
Figure 6 is a view showing a side beam control plate mounted to the left and right edge of the base substrate of the antenna according to the present invention,
7 is a view simulating the mounting of the dipole substrate and the beam control plate on the base substrate of the antenna according to the present invention from different angles,

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8 to 11 are photographs showing a physical example of a folded dipole antenna according to the present invention;

12 is a view showing a comparison of the beam pattern when the beam control plate is not mounted (a) and when mounted (b) in the antenna according to the present invention.

[Description of Code for Major Parts of Drawing]

10: base substrate 11: back of base substrate

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12, 13: dipole substrate mounting portion 14: beam control plate mounting portion

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16: printed circuit pattern 17: via hole

18: front side of base substrate 20: first dipole substrate

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21: front surface of the first dipole substrate 22: dipole element
23: feed surface 24: the rear of the first dipole substrate
25: fitting groove 30: the second dipole substrate

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31: Front surface of the second dipole substrate 32: Dipole element
33: feed surface 34: the rear of the second dipole substrate
35: fitting groove

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40, 50, 60: beam control plate 41, 51, 61: projection

42,52,62: Base 43,53,63: Bend

44,54,64: corners of both ends of bend

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Claims (8)

A base substrate having a dipole substrate mounting portion for mounting a folded dipole substrate at a central portion thereof, a beam adjusting plate mounting portion for mounting a beam adjusting plate at an edge portion in four directions, and reflecting radio waves forward; The dipole substrate mounting portion formed on the front surface of the base substrate is alternately mounted in an X-shape cross folded dipole type, and radiates radio waves in two orthogonal directions to generate a circular polarization waveform. Inducing two dipole substrates; And A folded dipole antenna for RFID hand-held reader comprising a beam control plate of the "b" shape is mounted in the slot of the beam control plate mounting portion formed on the rear edge of the base substrate to improve the directivity of the beam pattern. The method of claim 1, wherein the two dipole substrates, Folded dipoles for RFID handheld readers, characterized in that the dipole elements bent at least twice at 90 degree angles on both sides thereof are symmetrical to each other, and the feed surface of the dipole elements is mounted on the dipole substrate mounting portion. antenna. The method of claim 2, wherein the two dipole substrates, A folded dipole antenna for an RFID handheld reader, characterized in that the fitting grooves are formed symmetrically in the center so as to be alternately mounted in an X shape. The method of claim 1, wherein the beam control plate, A folded dipole antenna for an RFID handheld reader, comprising: a support part formed by protruding protrusions inserted into a slot of the beam control plate mounting part and a bent part vertically bent in the longitudinal direction on the other side of the support part; . The method of claim 4, wherein the beam control plate, The folded dipole antenna for RFID handheld reader, characterized in that the bent portion is cut in the range of 2 ° to 45 ° range. The method of claim 1, wherein the beam control plate, A folded dipole antenna for an RFID handheld reader, comprising: a copper plate. delete delete

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