KR20090100833A - Wideband radio frequency identification tag antenna - Google Patents

Abstract

PURPOSE: A broadband RFID tag antenna is provided to simplify a configuration by soldering a chip for the RFID tag on a substrate with a pattern. CONSTITUTION: A broadband RFID tag antenna includes one substrate(100), a ground pattern(102), a ground terminal pattern(104), a radiating pattern(106), and a connection pattern(108). The ground pattern is formed in the whole lower surface of the substrate. The ground terminal pattern is formed in the upper part of the left of the substrate. The ground terminal pattern is connected to the ground pattern through a plurality of first via holes(104a). The ground terminal pattern is connected to the ground terminal of the chip for the RFID tag. The radiating pattern is formed in the upper side of the substrate and the right side of the ground terminal pattern. The radiating pattern is connected to the transmission and reception terminal of the chip for the RFID tag. The connection pattern is connected to the ground pattern through a plurality of second via holes(108a).

Description

Wideband Radio Frequency Identification Tag Antenna

The present invention relates to a wideband RFID tag antenna. More particularly, the present invention relates to a wideband RFID tag antenna, in which a chip for RFID tag is attached in a radio frequency identification (RFID) system and used to receive and transmit predetermined data over a wide band.

The RFID system is a contactless recognition system that transmits and processes information of objects and surrounding environment information through radio frequency. RFID systems, which have emerged since the 1980s, are called dedicated short range communication systems or radio identification systems.

The RFID system basically consists of an RFID tag storing data and an RFID reader having a function of reading data stored in the RFID tag. The RFID tag is composed of a chip and an antenna for an RFID tag made of a semiconductor, and is classified into a passive type and an active type according to its operation characteristics. The passive type has no internal power supply and operates by receiving energy from the radio wave signal of the RFID reader, and the active type has a battery embedded in the RFID tag to operate by itself.

The RFID technology used in RFID systems has the advantage of not requiring direct contact or scanning in the visible band as a bar code. Due to these advantages, RFID system is being evaluated as a replacement system for bar code system, and its range of use is expected to continue to expand.

Radio frequency (RF) bands used in RFID systems include 30-500 GHz bands divided into low frequency bands, and 850-950 MHz and 2.4-2.5 GHz bands divided into high frequency bands. Here, the low frequency band has a short recognition distance of 1.8m or less, and the high frequency band has a relatively long RF recognition distance of 27m or more. Therefore, the RFID system using the RF signal of the corresponding frequency band may be used depending on whether the recognition distance is long or short.

Such an RFID system is composed of an RFID tag attached to a predetermined article and storing information on the article, and an RFID reader communicating with the RFID tag. The RFID reader modulates and transmits a radio frequency (RF) signal having a specific carrier frequency. When the article to which the RFID tag is attached is located in a read zone of the RFID reader, the RFID tag receives a signal transmitted by the RFID reader and is stored in an internal memory in response to the received signal. Send certain information to the RFID reader.

Antennas used in the RFID tag in the RFID system are known, including Korean Patent No. 688093.

However, the above-described conventional antennas have a relatively complicated structure and a complicated production process, resulting in low productivity. In addition, the conventional antennas have a fixed frequency used by the RFID tag, which makes it difficult to change the frequency.

Therefore, a problem to be solved by the present invention is to provide a wideband RFID tag antenna that can simplify the production process and can be easily manufactured.

In addition, the present invention provides a wideband RFID tag antenna that can easily change the frequency range for transmitting and receiving, and can be transmitted and received over a wide band.

According to the broadband RFID tag antenna of the present invention, a ground pattern is formed on the entire bottom surface of one substrate. A ground terminal pattern is formed at the upper left of the upper surface of the substrate to connect the ground terminal of the RFID tag chip to be connected to the ground pattern through a plurality of first via holes.

A radiation pattern is formed on the right side of the ground terminal pattern on the upper surface of the substrate to connect the transmitting and receiving terminals of the RFID tag chip, and a connection pattern is integrally formed with the radiation pattern on the lower end of the ground terminal pattern on the upper surface of the substrate. It is formed and connected to the ground pattern through a second via hole.

Here, the present invention can simply change the frequency to be transmitted and received by changing the positions of the plurality of first and second via holes.

Therefore, the broadband RFID tag antenna of the present invention is formed on one substrate, the ground pattern formed on the entire bottom surface of the substrate, and is formed on the upper left side of the upper surface of the substrate, and is connected to the ground pattern through a plurality of first via holes. A ground terminal pattern to which a ground terminal of a chip for a radio frequency identification (RFID) tag is connected, a radiation pattern formed at a right side of the ground terminal pattern on an upper surface of the substrate and connected to a transceiver terminal of the chip for a RFID tag; And a connection pattern formed on an upper surface of the substrate, at a lower end of the ground terminal pattern, integrally with the radiation pattern and connected to the ground pattern through a plurality of second via holes.

The plurality of first via holes and the plurality of second via holes may be formed in a line at a position biased to the left with the middle portion of the ground terminal pattern as a reference line.

The plurality of first via holes are formed in a line in a position biased to the left with the middle portion of the ground terminal pattern as a reference line, and the second via holes are formed in a line in a position biased to the right with the middle portion of the ground terminal pattern as a reference line. It is characterized by.

The plurality of first via holes are formed in a line at a position biased to the left with the middle portion of the ground terminal pattern as a reference line, and the plurality of second via holes are partially formed in line with the plurality of first via holes. The other part is characterized in that the middle portion of the ground terminal pattern is formed in a line in a position biased to the right side.

The plurality of first via holes and the plurality of second via holes may be formed in a line at a position where the middle portion of the ground terminal pattern is a reference line.

The plurality of first via holes are formed in a line in a position biased to the left with respect to the middle portion of the ground terminal pattern as a reference line, and the plurality of second via holes are arranged in a line in a position biased to the left than the plurality of first via holes. It is characterized by being formed.

According to the broadband RFID tag antenna according to the present invention, by forming a pattern on one substrate and soldering the RFID tag chip to the substrate on which the pattern is formed, the configuration is very simple, the production process is simple, the productivity is high, In addition, it is possible to transmit and receive predetermined data over a wide band.

In addition, the wideband RFID tag antenna of the present invention can change the frequency transmitted and received by the RFID tag by simply changing the positions of the plurality of first via holes and the plurality of second via holes.

The following detailed description is only illustrative, and merely illustrates embodiments of the present invention. In addition, the principles and concepts of the present invention are provided for the purpose of explanation and most useful.

Accordingly, various forms that can be implemented by those of ordinary skill in the art, as well as not intended to provide a detailed structure beyond the basic understanding of the present invention through the drawings.

1 is an exploded perspective view showing the configuration of a preferred embodiment of the broadband RFID tag antenna of the present invention, Figure 2 is a plan view showing a coupled state, Figure 3 is an enlarged cross-sectional view taken along line A-A of FIG.

Here, reference numeral 100 denotes a substrate. The substrate 100 is, for example, a Teflon substrate, and the ground pattern 102 is formed on the entire bottom surface. The ground terminal pattern 104 is formed on the upper left of the upper surface of the substrate 100, and a plurality of first via holes 104a are formed at a position biased to the left side from the middle portion of the ground terminal pattern 104 so that the ground is formed. The terminal pattern 104 is electrically connected to the ground pattern 102 through the plurality of via holes 104a.

And the radiation pattern 106 is formed on the right side of the ground terminal pattern 104, the RFID tag chip 110 is fixed between the ground terminal pattern 104 and the radiation pattern 106, the radiation pattern 106 The lower left side of the bottom) of the connection pattern 108 is formed integrally with the radiation pattern 106, a plurality of second vias to be aligned with the plurality of first via holes 104a in the connection pattern 108 The hole 108a is formed.

In one embodiment of the broadband RFID tag antenna of the present invention configured as described above, the RFID tag chip 110 is fixed between the ground terminal pattern 104 and the radiation pattern 106. That is, the ground terminal of the RFID tag chip 110 is soldered to the ground terminal pattern 104 and electrically connected to the ground pattern 102, and the transmitting and receiving terminal of the RFID tag chip 110 is connected to the radiation pattern 106. Is soldered.

In the present invention, a signal transmitted by an RFID reader (not shown) is received as a radiation pattern 106 and input to a transmitting and receiving terminal of the chip 110 for an RFID tag. The predetermined data output from the RFID tag chip 110 to the transmission and reception terminal is applied to the radiation pattern 106 to be radiated to the air.

The reflection coefficient of the broadband RFID tag antenna of the present invention was measured to obtain a result as shown in FIG. 4.

4, the wideband RFID tag antenna of the present invention transmits and receives a 890-950MHz wideband signal transmitted by a chip for an RFID tag with a reflection coefficient of -3 GHz or less in a wide frequency band of about 890-950MHz. It can be seen that.

In the broadband RFID tag antenna of the present invention, the reflection coefficient was measured while changing the positions of the plurality of first and second via holes 104a and 108a.

5A is a plan view showing the configuration of another preferred embodiment of the broadband RFID tag antenna of the present invention. According to another exemplary embodiment of the broadband RFID tag antenna of FIG. 5A, the plurality of first via holes 104a formed in the ground terminal pattern 104 are positioned as they are, and the plurality of second formed in the connection pattern 108 is provided. The via holes 108a are formed in a line inside the connection pattern 108.

As a result of measuring the reflection coefficient of another embodiment of the broadband RFID tag antenna of the present invention, the result as shown in FIG. 5B was obtained.

Referring to FIG. 5B, another embodiment of the wideband RFID tag antenna of the present invention shown in FIG. 5A provides a broadband signal of 960 MHz or more transmitted by a chip for an RFID tag with a reflection coefficient of −3 dB or less at a frequency of about 960 MHz. It can be seen that it can transmit and receive.

6A is a plan view showing the configuration of another preferred embodiment of the broadband RFID tag antenna of the present invention. According to another exemplary embodiment of the broadband RFID tag antenna of FIG. 6A, the plurality of first via holes 104a formed in the ground terminal pattern 104 are positioned as they are, and the plurality of second formed in the connection pattern 108 is provided. Some of the second via holes 108a of the via holes 108a are positioned in a line with the plurality of first via holes 104a, and some of the second via holes 108a are formed in a line inside the connection pattern 108. For example, in the case where three second via holes 108a are formed, the via vias 108a positioned in the middle thereof are positioned in line with the plurality of first via holes 104a, and the remaining two via holes ( 108a) is formed in a line inside the connection pattern 108.

As a result of measuring the reflection coefficient of another embodiment of the broadband RFID tag antenna of the present invention, the result as shown in FIG. 6B was obtained.

Referring to FIG. 6B, another embodiment of the wideband RFID tag antenna of the present invention shown in FIG. 6A is an RFID tag having a reflection coefficient of −3 dB or less at a frequency of about 955 MHz or more lower than the other embodiment shown in FIG. 5A. It can be seen that it is possible to transmit and receive wideband signals of 955 MHz or more transmitted by the chip.

7A is a plan view showing the configuration of another preferred embodiment of the broadband RFID tag antenna of the present invention. According to another exemplary embodiment of the broadband RFID tag antenna of FIG. 7A, the plurality of first via holes 104a formed in the ground terminal pattern 104 are positioned as they are, and the plurality of second formed in the connection pattern 108 is provided. Some of the second via holes 108a of the via holes 108a are positioned in a line with the plurality of first via holes 104a, and some of the second via holes 108a are formed in a line inside the connection pattern 108. For example, in the case of forming three second via holes 108a, two second via holes 108a positioned at upper and middle portions thereof are positioned in line with the plurality of first via holes 104a. The other via hole 108a is formed inside the connection pattern 108.

As a result of measuring the reflection coefficient of another embodiment of the broadband RFID tag antenna of the present invention, the result as shown in FIG. 7B was obtained.

Referring to FIG. 7B, another embodiment of the wideband RFID tag antenna of the present invention shown in FIG. 7A has a reflection coefficient of −3 GHz or less at a frequency of about 925 to 990 MHz lower than the other embodiment shown in FIG. 6A. It can be seen that the broadband signal of about 925 to 990 MHz transmitted by the chip for RFID tag can be transmitted and received.

8A is a plan view showing the configuration of another preferred embodiment of the broadband RFID tag antenna of the present invention. Another embodiment of the broadband RFID tag antenna of the present invention shown in Figure 8a is formed in a row in the middle position of the ground terminal pattern 104 a plurality of first via holes 104a formed in the ground terminal pattern 104, The plurality of second via holes 108a formed in the connection pattern 108 are formed in line with the plurality of first via holes 104a.

As a result of measuring the reflection coefficient of another embodiment of the broadband RFID tag antenna of the present invention, the result as shown in FIG. 8B was obtained.

Referring to FIG. 8B, another embodiment of the antenna of the present invention shown in FIG. 8A is a broadband of about 920 to 980 MHz transmitted by a chip for an RFID tag with a reflection coefficient of -3 dB or less at a frequency of about 920 to 980 MHz. It can be seen that the signal can be sent and received.

Figure 9a is a plan view showing the configuration of another preferred embodiment of a broadband RFID tag antenna of the present invention. Another embodiment of the broadband RFID tag antenna of the present invention illustrated in FIG. 8A is a position in which the plurality of first via holes 104a formed in the ground terminal pattern 104 is shifted to the left side from the middle of the ground terminal pattern 104. The plurality of second via holes 108a formed in a row and formed in the connection pattern 108 are formed in a row at a position deviated to the left of the plurality of first via holes 104a.

As a result of measuring the reflection coefficient of another embodiment of the broadband RFID tag antenna of the present invention, the result as shown in FIG. 9B was obtained.

Referring to FIG. 9B, another embodiment of the broadband RFID tag antenna of the present invention shown in FIG. 9A is about 870 to 920 transmitted by a chip for an RFID tag with a reflection coefficient of -3 dB or less at a frequency of about 870 to 920 MHz. It can be seen that a wideband signal of MHz can be transmitted and received.

That is, the wideband RFID tag antenna of the present invention changes the positions of the plurality of first via holes 104a formed in the ground terminal pattern 104 and the plurality of second via holes 108a formed in the connection pattern 108. As the frequency that can be transmitted and received varies, the positions of the plurality of first via holes 104a and the plurality of second via holes 108a may be simply changed according to the frequencies to be used in the RFID system.

The present invention has been described in detail with reference to exemplary embodiments, but those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. Will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

The present invention relates to an antenna used for an RFID tag in an RFID system, and a ground pattern is formed on the entire bottom surface of one substrate, and a ground terminal pattern is formed on the upper left of the upper surface to which the ground terminal of the RFID tag chip is connected. A ground pattern formed on a right side of the ground terminal pattern on the upper surface of the substrate, and a transmitting and receiving terminal of the chip for the RFID tag is connected to the ground pattern through a first via hole in the upper surface of the substrate. A connection pattern is formed integrally with the radiation pattern at a lower end of the terminal pattern to connect the ground pattern through a second via hole, and thus the frequency of transmission and reception can be easily changed as the positions of the plurality of first and second via holes are changed. Yes, of course, it can transmit and receive broadband signals, its structure is simple, and its productivity is high.

1 is an exploded perspective view showing the configuration of a preferred embodiment of a broadband RFID tag antenna of the present invention;

2 is a plan view showing a combined state of a preferred embodiment of a broadband RFID tag antenna of the present invention;

3 is a partially enlarged cross-sectional view of a preferred embodiment of the broadband RFID tag antenna of the present invention;

Figure 4 is a graph showing the measurement of the reflection coefficient of an embodiment of a broadband RFID tag antenna of the present invention,

5 to 9 are views showing other preferred embodiments of the broadband RFID tag antenna of the present invention,

5A to 9A are plan views showing other preferred embodiments of the broadband RFID tag antenna of the present invention, and

5B to 9B are graphs illustrating reflection coefficients of other embodiments of the broadband RFID tag antenna of the present invention shown in FIGS. 5A to 9A.

Claims (6)

One substrate; A ground pattern formed on the entire bottom surface of the substrate; A ground terminal pattern formed on an upper left side of the upper surface of the substrate, connected to the ground pattern through a plurality of first via holes, and connected to a ground terminal of a chip for an RFID tag; A radiation pattern formed on a right side of the ground terminal pattern on an upper surface of the substrate and connected to a transceiver terminal of the chip for RFID tag; And And a connection pattern formed integrally with the radiation pattern at a lower end of the ground terminal pattern on the upper surface of the substrate and connected to the ground pattern through a plurality of second via holes. The method of claim 1, wherein the plurality of first via holes and the plurality of second via holes comprise: a plurality of first via holes; Broadband RFID tag antenna, characterized in that formed in a line in a position biased to the left with the middle portion of the ground terminal pattern as a reference line. The method of claim 1, wherein the plurality of first via holes; The middle part of the ground terminal pattern is formed in a line in a position oriented to the left side as a reference line, The second via hole; Broadband RFID tag antenna, characterized in that formed in a line in a position biased to the right with the middle portion of the ground terminal pattern as a reference line. The method of claim 1, wherein the plurality of first via holes; The middle part of the ground terminal pattern is formed in a line in a position oriented to the left side as a reference line, The plurality of second via holes; And a part of which is formed in a line with the plurality of first via holes, and the other part of which is formed in a line at a position biased to the right with respect to a middle portion of the ground terminal pattern as a reference line. The method of claim 1, wherein the plurality of first via holes and the plurality of second via holes comprise: a plurality of first via holes; A wideband RFID tag antenna, wherein the middle portion of the ground terminal pattern is formed in a line with a reference line as a reference line. The method of claim 1, wherein the plurality of first via holes; The middle part of the ground terminal pattern is formed in a line in a position oriented to the left side as a reference line, The plurality of second via holes; The wideband RFID tag antenna, characterized in that formed in a line in a position biased to the left than the plurality of first via holes.

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