KR101456071B1 - Rfid special tag with the folded 4-transmission line antenna - Google Patents

Abstract

The present invention relates to an RFID special tag composed of four grid-type transmission line antennas, and a 900-MHz UHF RFID special tag antenna composed of four grid-type transmission line antennas is present in a quadrangle- A power feed line 10 serving as a path of a radio wave signal from a signal source, a feed pin 11 connecting four radiators formed on the upper surface of the two-layer structure and the feed line 10 formed on the rim of the lower surface, A shorting pin 12 to which a ground and a signal line are connected, at least one radiator 13a, 13b, 13c, 13d located on the upper surface of the two-layer structure and composed of a plurality of radiators, and a feed line 10 And at least one microchip 14a, 14b, 14c, 14d located on the feed pin 11 and used as a RFID tag chip for a 900 MHz band, each layer being used as a dielectric layer, Go A 900 MHz band RFID tag having a high temperature and impact resistance is implemented by using the PIFA (Planar Inverted-F Antenna) antenna and attaching the at least one microchip to each feeder or feed pin Even if one microchip is damaged due to external temperature and impact, another microchip is used to maintain the durability.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an RFID tag having four grid-type transmission line antennas,

The present invention relates to an RFID special tag composed of four grid-type transmission line antennas, and more particularly, to a high-reliability 900MHz band RFID tag capable of withstanding high temperatures and high impacts, and a PIFA (flat- Planar Inverted-F Antenna) antennas and attach microchip (900MHz band RFID tag chip) to each feeder part to operate the other microchip even if one microchip breaks against external temperature and impact. Height is related to an RFID special tag composed of four lattice type transmission line antennas.

An RFID (Radio Frequency Identification) system is, for example, an RFID tag including unique information attached to a product, an RFID reader for reading tag information attached to a product using wireless communication in an RFID frequency band of 13.56 MHz or 900 MHz Reader, and RFID reader to the application of the host computer through the RFID middleware.

The RFID frequencies are 135 kHz, 13.56 MHz, 433 MHz, 860-960 MHz (UHF band), and 2.45 GHz band. The low frequency 13.56MHz RFID system is used to recognize the tag attached to the product. The recognition distance is only a few centimeters, and the recognition distance of the 900MHz UHF RFID system can be recognized up to 100m distant. It is used for distribution, logistics, port container.

RFID technology for product management provides B2B2C service in the distribution and logistics field using 900MHz band in EPCGlobal

The RFID reader and the tag are composed of a forward link and a reverse link according to the transmission direction of the information. The forward link transmits a command signal and a continuous wave (CW) signal that supplies power to the tag to obtain unique information of the tag from the RFID reader to the tag. The reverse link is a process in which a tag reaches a tag signal through an RFID reader based on a CW signal received from an RFID reader through an inverse scattering process. A tag is composed of an RFID tag chip (microchip) and an antenna including unique product information, and is classified into an active tag and a passive tag according to a power supply scheme. The passive tag is made by using radio waves generated by the RFID reader, and the active tag uses a separate power source.

The RFID tag is composed of a microchip and an antenna. The product information stored in the memory is transmitted to the RFID reader. The RFID tag is divided into a passive tag and an active tag depending on the power source. And special type tags. The special type tag requires various technologies according to the usage environment. Especially, in the steel field and the automobile field, there is a need for a technology for minimizing the frequency change according to the metal surface, a technique for attaching it, and a recognition technique based on the rapid temperature change and a wide band technology for global use. In the defense field and medicine field, And techniques for minimizing frequency variation due to liquid components, techniques for realizing miniaturization, implementation technology, and security.

BACKGROUND ART [0002] A conventional technology is a radio frequency tag (RFID tag) and a method of implementing radio frequency identification (RFID tag), and a RFID tag structure (JP-P-2005-100194496) UHF band passive RFID metal tag antenna (Korea, Kwangwoon University, 10-2006-0107662) using DISTANCE (USA, Intermach) and indirect coupling and RFID tag and production method for metal (Korea, 0038405).

These technologies are technologies in each localized environment and do not meet the requirements of various environmental aspects. Therefore, it is possible to use in the global UHF band as in the present invention, excellent recognition distance and recognition rate, high capacity and wide band characteristics, high resistance to harsh environments such as high impact or high temperature, Band RFID tag having high reliability has become necessary.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an RFID tag having four lattice transmission line antennas which can be used in a global UHF band (900 MHz band) and has high reliability.

Further, the present invention uses a plurality of lattice-type transmission lines as a radiator and reduces the recognition rate due to changes in frequency depending on contents of various external environments (steel, plastic, glass, liquid, etc.). In order to minimize such a phenomenon, the RFID tag antenna has a wide band structure and a radiator is separately formed, thereby minimizing the interference to the contents of the external environment, thereby improving the applicability in a real environment.

Also, in order to secure high reliability, the present invention is characterized in that a microchip is attached to a feeding pin to solve a part related to a primary temperature, and a plurality of PIFA antennas are installed in a grid on a transmission line, Which is linearly implemented in accordance with the shape of the antenna and is capable of easily changing the beam direction.

It is another object of the present invention to provide a method of attaching an RFID tag to a floor surface capable of stably operating in various external environments.

In order to achieve the object of the present invention, an RFID special tag composed of four lattice-type transmission line antennas is composed of four grid-type transmission line antennas, and the 900 MHz UHF band RFID special tag antenna has a four- A feeding line 10 which is present and which serves as a path of a radio wave signal from a signal source, a feeding pin 10 connecting four radiators formed on the upper surface of the two-layer structure and the feeding line 10 formed on the rim of the lower surface A shorting pin 12 to which a ground and a signal line are connected, at least one radiator 13a, 13b, 13c, 13d located on the upper surface of the two-layer structure and composed of a plurality of radiators, 14b, 14c, 14d located on the feeder line 10 or located on the feed pin 11 and used as a 900-MHz band RFID tag chip, each layer being used as a dielectric layer, Transmission lines A PIFA (Planar Inverted-F Antenna) antenna having a thickness of 1 mm or less is used, and at least one microchip is attached to each feeder or feed pin, and a 900 MHz band RFID tag having durability at high temperature and impact So that even if one microchip is damaged with respect to external temperature and impact, another microchip is used to maintain durability.

A RFID special tag and a mounting method composed of four grid transmission line antennas according to the present invention are manufactured by fabricating a highly reliable 900MHz band RFID tag capable of withstanding high temperature and high impact and forming a PIFA having a plurality of transmission lines, Planar Inverted-F Antenna) antennas and attach microchip (900MHz band RFID tag chip) to each feeder part to operate the other microchip even if one microchip breaks against external temperature and impact. There is an effect of maximizing.

In addition, the 900-MHz band RFID tag antenna composed of four grid-type transmission line antennas increased the capacitive capacitance and the current distribution at the edge portion of the radiator to increase the optical band and radiation efficiency, and each radiator 13a, 13b, 13c , 13d) are varied to extend the bandwidth.

FIG. 1 is a perspective view illustrating the overall structure of a 900 MHz UHF band RFID special tag composed of four lattice-type transmission line antennas according to the present invention.
FIG. 2 is a front view showing a radiator structure of an antenna of an RFID special tag composed of four lattice-type transmission line antennas according to the first embodiment of the present invention and an antenna structure of an existing antenna composed of four lattice-type transmission line antennas.
3 is a graph showing the VSWR of the conventional radiator and the radiator proposed in the present invention.
4 is a graph showing a structure using two RFID tag chips and a VSWR of a structure using four RFID tag chips.
5 is a front view showing a feed line of a 900 MHz UHF band RFID special tag according to the second embodiment of the present invention.
6 is a front view of a 900 MHz UHF band RFID special tag using two microchips according to a third embodiment of the present invention.
7 is a front view of a 900 MHz UHF band RFID special tag using four microchips.
8 is a cross-sectional view illustrating a structure for protecting a microchip used as a 900 MHz UHF band RFID tag chip for high reliability.
9 is a view for explaining a method of attaching an RFID special tag using a microchip on the bottom surface.

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

FIG. 1 is a perspective view illustrating the overall structure of a 900 MHz UHF band RFID special tag composed of four lattice-type transmission line antennas according to the present invention.

A 900MHz UHF band RFID tag antenna consisting of four grid transmission line antennas is placed on the bottom of a two-layer structure and is placed on a feeding line (which is located around a quadrangle and acts as a path of a radio signal from a signal source) 10, a feed pin 11 connecting four radiators formed on the upper surface of the two-layer structure and the feeder line 10 formed on the edge of the lower surface, a shorting pin 10 connected to a ground and a signal line, (13a, 13b, 13c, 13d) located on the top surface of the two-layer structure and composed of four radiators, and on the feed line (10) And four microchips 14a, 14b, 14c, and 14d used as a 900-MHz band RFID tag chip,

A PIFA (Planar Inverted-F Antenna) antenna having a plurality of transmission lines is used, the at least one microchip (900 MHz band RFID tag chip) is attached to each feeder or feed pin, And 900 MHz band RFID tag having shock resistance are realized to maintain durability by using another microchip even if one microchip is damaged against external temperature and impact.

The construction of a 900 MHz UHF band RFID special tag composed of four grid type transmission line antennas is composed of four transmission line radiators 13a, 13b, 13c and 13d, a shorting pin 12, a feeding pin 11 and a feeding line 10 And a microchip (900 MHz band RFID tag chip) 14, and each layer uses a dielectric layer. The basic principle of an antenna is similar to the principle of a FOLDED TRANSMISSION LINE LOOP ANTENNA. The plurality of radiators 13a, 13b, 13c, and 13d are implemented in a wide band using one feeding line 10. Further, the radiators 13a, 13b, 13c, and 13d can be used for respective bands. Four shorting pins (12) and a high dielectric layer were used to miniaturize the 900MHz UHF band RFID tag antenna composed of four grid transmission line antennas. The four microchips 14a, 14b, 14c, and 14d are located on one feeder line 10. When the four radiators 13a, 13b, 13c and 13d are operated respectively, the microchip (900 MHz band RFID tag chip) 14a, 14b, 14c and 14d are located on the feeder line 10, (11).

At least one microchip used as a 900-MHz band RFID tag chip stores the same product information so that another microchip can be used even if one microchip is broken due to external temperature or impact.

2 and 5, 6, and 7 are front views of RFID special tag layers according to the present invention.

FIG. 2 shows a radiator of the present invention. The left side of FIG. 2 shows a radiator structure of an existing antenna composed of four grid transmission line antennas, and the right side of FIG. 2 shows a structure of four grid transmission line antennas according to the first embodiment of the present invention. FIG. 2 is a front view showing a radiator structure of an antenna of an RFID special tag composed of RFID tags.

≪ Embodiment 1 >

2, a 900-MHz band RFID tag antenna composed of four lattice-type transmission line antennas including a radiator 1, a radiator 2, a radiator 3, and a radiator 4 has a capacitive capacitance and a current distribution To increase the optical bandwidth and radiation efficiency, and to extend the bandwidth by changing the lengths of the respective radiators 13a, 13b, 13c, and 13d. As the length of the radiator changes, the capacitive capacitance and inductance change. When the length of the radiator is longer than? / 4, the resonance frequency of the RFID tag antenna is lowered due to the change of the capacitive capacitance and the inductance. If the length of the radiator is shorter than? / 4, the resonance frequency of the RFID tag antenna is increased. In addition, the bandwidth of the 900MHz UHF RFID special tag antenna can be doubled from VSWR 2: 1, and the efficiency of the antenna can be increased in the same band. When the RFID special tag antenna uses two to four feeding lines, the efficiency of the antenna can be increased by extending the bandwidth.

(1) VSWR of existing structure and proposed structure

3 is a graph showing the VSWR of the conventional radiator and the radiator proposed in the present invention. The conventional radiator is designed to have the same length of all four radiators. In this structure, all four emitters have a phase difference of 90 ° and a bandwidth of about 22 MHz at VSWR 2: 1 or less.

The structure of the four radiators proposed in the present invention is designed such that the pair of opposed radiators has a length different from that of the other pair of radiators. In this structure, since the opposite radiators have the same resonance frequency and neighboring radiators have different resonance frequencies, if the four radiators are designed to have a phase difference of 90 °, they have a wider bandwidth than the existing structure. The proposed emitter exhibits a bandwidth of about 41 MHz below VSWR 2: 1.

(2) VSWR structure using two tag chips and structure using four tag chips

4 is a graph showing a structure using two RFID tag chips and a VSWR of a structure using four RFID tag chips.

In the structure using two RFID tag chips, two neighboring radiators are designed to be connected to one microchip (RFID tag chip). In this structure, the radiators connected to the tag chip 1 and the tag chip 2 are designed to have different lengths and have different resonance frequencies.

In the structure using four RFID tag chips, each radiator is connected to a tag chip, and all the radiators are designed to have different lengths. In the structure using four RFID tag chips, since the lengths of all the radiators are designed differently, they exhibit a wider bandwidth in the structure using two RFID tag chips.

≪ Embodiment 2 >

5 is a front view showing a feed line of a 900 MHz UHF band RFID special tag according to the second embodiment of the present invention. The feeding line uses 50 Ohm. In the microchip (900 MHz RFID tag chip), the feed 1-1, the feed 1-2, and the feed 1-3 are implemented such that the phases are 90 degrees apart from each other.

≪ Third Embodiment >

6 is a front view of a 900 MHz UHF band RFID special tag using two microchips according to a third embodiment of the present invention.

The 900 MHz UHF band RFID special tag according to the third embodiment can use two microchips. The black portion represents a microchip (900 MHz UHF band RFID tag chip). Two impedance matching lines are used. Impedance matching line 1 is used for impedance matching between a microchip (900 MHz RFID tag chip) and a feeding line to radiate a signal without loss. Impedance matching line 2 is used for radiator It is used for impedance matching of the feeding line. The position of the microchip (900MHz RFID tag chip) used in the 900MHz UHF band RFID tag chip is located in the most stable part in the external environment by the chip protection area. The central support hole is used for attaching and securing with an external device.

The 900 MHz UHF band RFID special tag according to the third embodiment uses two microchips. When two microchips are used, the phases of the microchip 1 and the feeding 1 - 1 and the phases of the feeding 1 - 2 in the microchip 1 are realized to be 90 °. The phases of the microchip 2 and the feeders 1-3 and the phase of the microchip 2 and the feeders 1-4 are 90 degrees.

<Fourth Embodiment>

7 is a front view of a 900 MHz UHF band RFID special tag using four microchips according to a fourth embodiment of the present invention.

The 900 MHz UHF band RFID special tag according to the fourth embodiment uses four microchips. When four microchips are used, the microchip 1 and the feeder 1-1, the microchip 2 and the feeder 1-2, the microchip 3 and the feeder 1-3, and the microchip 4 and the feeder 1-4 have the same phase .

8 is a cross-sectional view illustrating a structure for protecting a microchip used as a 900 MHz UHF band RFID tag chip for high reliability.

A method of attaching a microchip between a dielectric substrate and a dielectric substrate is used to secure a high temperature and high reliability. In the present invention, a microchip (RFID tag chip) 14 is placed between dielectric substrates 18 in order to secure a high temperature and high reliability, and a soldered portion of a microchip and a feeder wire is subjected to paste treatment A tag chip protecting portion 15 is used to protect against corrosion due to moisture due to water absorption rate inherent to the dielectric and performance change.

The tag chip protecting portion 15 is formed on the microchip 14 and the alumina (Al ₂ O ₃ ) material having ferrite and high dielectric constant is formed in powder form on the dielectric substrate and the microchip 14 A shock mitigation and thermal insulation unit 16 is used to minimize external shocks or temperature effects that are filled and transferred to the microchip in a radiator or feeding. The alumina (Al ₂ O ₃ ) used has a high melting point (about 2000 ° C.), and when it is in a fine state, it contains a large amount of air, It is protectable. In the tag packaging, an injection molding part 19 formed by insert injection is applied to an RFID special tag, and a soft Urethane material is used for the tag-attached part in consideration of the impact and the attachment surface.

9 is a view for explaining a method of attaching an RFID special tag using a microchip on the bottom surface. The RFID special tag is shown in Fig. 9 when it is attached to the floor surface without being buried on the floor.

RFID special tags are used in many external environments, and they are attached to the bottom of roads without being buried on the floor. There is an environment for managing the metal component or managing the substance of the liquid component in the RFID tag antenna. The present invention explores portions for RFID special tags on the bottom plane. When the RFID special tag is attached to the outer floor, the bottom surface may be a metal surface or may be on a surface such as asphalt, cement or soil. In addition, it may be exposed to rain or very hot ultraviolet rays. In addition, the tag is broken due to a car and a moving object that can give an external impact. A vehicle with a weight of from about 600 kg to as much as 10,000 kg should be able to withstand the load if it passes by. Therefore, when the RFID special tag is attached to the bottom surface, if the RFID tag is exposed to the external environment for a long time due to temperature change, impact change and humidity change on the bottom surface, the performance of the RFID special tag is changed. Therefore, the present invention proposes a method of attaching a RFID special tag that can withstand the external environment on the bottom surface without being embedded in the bottom surface.

In the RFID special tag, four holes (4-4) are formed in the RFID special tag for attaching the antenna, and the first binding screws (9b, 9c) are fastened. RFID special tags and tag guides (brakes) have holes (4-1) connecting the RFID special tags and the brakes. 4-3 is a guide hole connected with the special tag and has a screw tip. The holes are configured to allow air to circulate to minimize humidity and temperature variations, depending on the nature of the floor. Reference numeral 4-2 denotes a guiding hole 4-2 which is attached to a guide surface and a bottom surface on one side, and second binding screws 9a and 9d are fastened. 4-5 should adjust the height according to the amount of humidity. 4-6 is a shock absorber (4-6) that absorbs shock when mounting the rugged part of the floor.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken in conjunction with the present invention. The present invention can be variously modified or modified.

10: feeder line
11: Feed pin
12: Shorting pin
13a, 13b, 13c, 13d: radiator 1, radiator 2, radiator 3, radiator 3
14a, 14b, 14c and 14d: Microchip (900 MHz UHF band RFID tag chip)
15: tag chip protection section
16: shock mitigation and thermal insulation
17: Impedance matching line
18: dielectric substrate
19: Injection molding section
20, 21: dielectric (air, FR4 substrate, etc.)

Claims (11)

A 900MHz UHF band RFID special tag antenna composed of four lattice-type transmission line antennas is placed on the lower surface of a two-layer structure and is disposed on a quadrangle, and includes a feeder line 10 serving as a path of a radio wave signal from a signal source, A feed pin 11 connecting four radiators formed on the upper surface of the layer structure and a feed line 10 formed on a rim of a lower surface, a shorting pin 12 connecting a ground and a signal line, And at least one radiator 13a, 13b, 13c and 13d which are located on the upper surface of the feeder pin 10 and are located on the feeder line 10 of the lower surface or on the feeder pin 11, At least one microchip (14a, 14b, 14c, 14d) used as a chip, each layer being used as a dielectric layer,
A PIFA (Planar Inverted-F Antenna) antenna having a plurality of transmission lines is used. The at least one microchip is attached to each feeder or feed pin, and a 900 MHz Band RFID tag is implemented to maintain durability by using another microchip even if one microchip is damaged against external temperature and impact. The method according to claim 1,
The at least one radiator 13a, 13b, 13c or 13d may be implemented in a wide band using one feeding line 10 or a plurality of radiators 13a, 13b, 13c, In case of using a 900 MHz UHF band RFID tag composed of four grid transmission line antennas, four shorting pins 12 and a high dielectric layer are used for miniaturization. An RFID special tag consisting of antennas. The method according to claim 1,
The at least one microchip (14a, 14b, 14c, 14d)
When the RFID tag chip of 900 MHz band is used or a single feeder 10 is used or when four radiators 13a, 13b, 13c and 13d are operated respectively, (11). &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt; The method according to claim 1,
The RFID special tag antenna increases the capacitive capacitance and the current distribution at the edge of the radiator to increase the optical band and radiation efficiency. If the radiator length is longer than? / 4, the capacitive capacitance and inductance change, When the resonance frequency of the antenna is lowered and the length of the radiator is shorter than? / 4, the resonance frequency of the RFID tag antenna is increased, and the bandwidth of the RFID special tag antenna can be expanded by a factor of two from VSWR 2: Wherein the RFID tag is configured to increase the efficiency of the antenna by extending the bandwidth when two to four feeding lines are used in the RFID tag. The method according to claim 1,
In the case where four radiators are used, in a structure in which a pair of opposed radiators is designed to be different from the pair of radiators, the opposed radiators have the same resonance frequency and the neighboring radiators have different resonance The RFID tag has four lattice-type transmission line antennas, each of which has a width greater than that of the conventional structure. The method according to claim 1,
The microchip
In a structure using two RFID tag chips storing the same product information, in a structure in which two neighboring radiators are connected to one microchip (RFID tag chip), the radiators connected to the tag chip 1 and the tag chip 2, In the structure using four RFID tag chips, each radiator is designed to have different lengths in the structure in which the respective radiators are connected to the tag chip. Thus, in the structure using two RFID tag chips, And the bandwidth of the RFID tag is secured. The method according to claim 1,
In the microchip used as a 900-MHz UHF band RFID tag chip, the feeding lines 1-1, 1-2, and 1-3 are 90-degree different in phase from each other. Wherein the RFID tag includes a plurality of antennas. The method according to claim 1,
In the case of the 900 MHz UHF band RFID special tag using the two microchips, two impedance matching lines are used. The impedance matching line 1 is an impedance matching between a microchip (900 MHz RFID tag chip) and a feeder line And the impedance matching line 2 is used for impedance matching between the radiator and the feeder line in order to radiate the signal without loss. The position of the microchip used in the 900 MHz UHF band RFID tag chip is located in the chip protection area, The phases of the microchip 1 and the feeding 1 - 1 and the phases of the feeding 1 - 2 in the microchip 1 are realized to be 90 °, and the phase of the microchip 2 and the feeding 1 - 2 and the feeds 1-4 are 90 degrees in phase. The method according to claim 1,
In the case of the 900 MHz UHF band RFID special tag using four microchips, the microchip 1 and the feeder 1-1, the microchip 2 and the feeder 1-2, the microchip 3 and the feeder 1-3, 4 and the feeds 1-4 are implemented in the same manner. The method according to claim 1,
The microchip
(RFID tag chip) is sandwiched between dielectric substrates 18 so as to have durability at high temperature and impact, and the soldered portion of the microchip and the feeder line is paste-processed using a silicon-based epoxy resin, A chip chip protecting part 15 for protecting against corrosion due to moisture and performance change due to moisture, and an alumina (Al ₂ O ₃ ) material having a ferrite and a high dielectric constant at the dielectric substrate and the microchip 14 in powder form And the impact mitigation and thermal insulation part 16 is used to minimize the influence of external shock or temperature transmitted to the microchip in the radiator or feeding. The tag packaging uses an injection molding part (19) is applied to an RFID special tag, and a soft Urethane material is used in a part where the RFID special tag is attached in consideration of impact and an attachment surface. Special tags. The method according to claim 1,
If the RFID special tag is attached to the outer bottom surface without being embedded in the bottom surface, if the RFID special tag is exposed to the external environment for a long time due to temperature change, impact change and humidity change on the bottom surface, And the first and second binding screws 9b and 9c are fastened together and the RFID special tag and the tag guide (bracket) are formed in the hole 4-1 connecting the RFID special tag and the bracket, And a guide hole connected to the RFID special tag and having a screw tip, a guide having an oblique side on one side, and a guide hole attached on the bottom surface and fastened with a second screw, and the height according to the amount of humidity And an impact absorbing portion (4-6) that absorbs shock when the bottom surface is mounted with a rugged portion.

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