KR100409047B1 - Credit card type transponder with radio frequency remote Identify system for long range cognition - Google Patents

Abstract

The present invention relates to a credit card type transponder incorporating a remote recognition system for long range recognition, and more particularly, to maximize the opening area of a microstrip antenna and to receive two slots and two dipole antennas accordingly. The second harmonic of the radio waves is radiated from the interrogator within a small card size to solve the inefficient problem in a system using a backseater, such as a transmit / receive frequency, as a carrier by ensuring maximum radiation efficiency at the resonance point. The beam power can be received at maximum, and the two slot resonant antennas are constituted by an orthogonal arrangement dual polarization antenna, so that the reception power in a direction is constant to enable long-range recognition.

To this end, the present invention, in the design and fabrication of the antenna for the card (Transponder Card), tapered slot antenna (Tapered Slot) in order to adhere to the basic theory of easy microstrip antenna and to maximize the efficiency of the microstrip antenna It consists of a complex type of antenna and a dipole antenna, and the polarized surface is normally arranged to be dual polarized by arranging two tapered slot antennas at right angles in consideration of the randomness of the card carrying and installation directions. In order to maximize the received high frequency power, the opening area can be as large as the size of the credit card, and the two dipole antennas are arranged to increase the transmission gain, and to accommodate the information marked by embossing when the credit card is issued. PVC oil wrapped on both sides with a copper thin plate of 0.1 mm or less It characterized in that one to meet the rate (Dielectricconstant).

Description

Credit card type transponder with radio frequency remote identify system for long range cognition}

The present invention relates to a credit card type transponder incorporating a radio frequency remote identify system using a radio frequency for long range recognition. More particularly, the present invention utilizes the maximum opening area of a microstrip antenna. In the system that uses Back Scatter as a carrier, such as transmit and receive frequency, by arranging two slots and two dipole antennas properly for maximum harmonic efficiency according to resonance point for secondary harmonics of received radio waves In order to solve the problem of inefficiency, the maximum beam power radiated from the interrogator can be received within the size of a small card. Long-range recognition is possible.

A transponder in the area that sends a beacon from the interrogator converts the high frequency of the received beacon into a DC power source and operates logic and memory semiconductors to modulate and transmit unique information to the back basket. There is a semi-passive type and an active type that use a separate power source for a passive transponder system and a transponder tag to use as a semiconductor operating power source.

In general, it is applied to subway and bus pass cards used for close distances, pass and battery-embedded parking lot management and vehicle management systems, animal management systems, logistics management systems, and its applications are increasing day by day. The antenna is a coiled loop antenna in the case of near-range low frequency, in the form of a microstrip or dipole antenna in the high frequency, and its gain is about -3 to +3 dBi.

Passive type high frequency identification transmission / reception system using backscaler has a maximum recognition distance of about 5 meters despite various uses, and shortens the recognition distance for recognition of high-speed moving objects that are directly affected by frequency drift. And the use of active type transmitter and receiver for application to high speed moving object or semi-passive method with built-in battery or separate power source to enable high speed remote transplantation. OBU (On Board Unit), which is in charge of this, is installed and applied.

The active type or the OBU type is extremely difficult to miniaturize the transmitting and receiving devices, thereby limiting the application fields. Durability due to deterioration of the active element cannot be guaranteed and the system using the watch battery can be miniaturized. As the number of times of use is directly affected by the life of the battery, its durability or stability, as well as the problem of shortening the life will occur.

In addition, there is a problem that the built-in battery type cannot be manufactured in the form of a credit card, and the linear type of the antenna of the transmitter and receiver used uses linear polarization. The gain variation is large depending on the direction of the transponder interrogator. The problem is reduced.

The present invention is to solve the above problems, by maximizing the opening area of the microstrip antenna and by arranging two slot antennas and two dipole antennas appropriately, the maximum harmonics of the received radio waves can be adjusted according to the resonance point. It is possible to receive the maximum beam power radiated from the interrogator within a small card size to solve the inefficient problem in a system using a backseater such as a transmit / receive frequency as a carrier. It is a technical problem that two slot resonant antennas are configured to orthogonally arranged dual polarized antennas to provide a long distance recognition with constant reception power according to a direction.

The present invention for achieving the above technical problem, in the design and manufacture of the antenna, by applying the dielectric constant of the credit card PVC material using a thin copper plate or aluminum plate to apply a microstrip and slot resonant circuit and to manufacture a credit card form It is characterized by configuring a printed circuit in the form of a PVC film to facilitate this.

Specifically, in the design and manufacture of an antenna for a card, a tapered slot antenna and a tapered slot antenna are provided in order to faithfully adhere to the basic theory of the microstrip antenna and to maximize the efficiency of the microstrip antenna. It consists of a dipole antenna and a transponder, which is a metal antenna composed of a complex type of integrated circuit, and the polarization plane is usually double polarized by arranging two tapered slot antennas at right angles in consideration of the randomness of the card carrying and installation direction. (Dual Polarization), the opening area can be as large as the size of the credit card in order to maximize the received high frequency power, and the two dipole antennas are arranged so that the transmission gain is increased, and the embossing when the credit card is issued ( 0.1 mm or less to accommodate the information marked by Embossing To ensure that consistent with the Li foil (Copper thin plate) as the dielectric constant of the PVC to be packaged on both surfaces (Dielectric constant).

In the above, the interrogator transmits a beacon, and the transponder in the area converts the high frequency of the received beacon into a DC power source to operate a logic and memory semiconductor to modulate and transmit unique information to the back basket. The passive passive transponder system and the semi-passive type and the active type which are used as the operating power of the semiconductor using separate power sources for the transponder tag are used.

Figure 1a is an appearance of a typical credit card

Figure 1b is an external side view of a typical credit card

Figure 2a is a credit card layout of a high gain antenna used in the present invention

Figure 2b is a cross-sectional view of the production of a long distance recognition credit card used in the present invention

3 is a structural diagram of a high gain antenna used in the present invention;

4 is a structural diagram of a basic antenna used in the present invention

5 is a structural diagram according to the antenna manufacturing part according to the present invention

6 is a comparison table of gain variation in the direction of the antenna

<Description of Symbols for Main Parts of Drawings>

10 credit card 11: magnetic stripe 20: metal antenna

21 integrated circuit (IC) 22 slot antenna 23 dipole antenna

24: tapered slot antenna

The present invention is a magnet having a size of 85.6 ± 0.12 mm (A) 53.98 ± 0.55 mm (B) and a maximum size of 5.54 mm (C) and a minimum of 15.82 (D) mm from the edge as shown in the accompanying drawings. Attached to a general credit card 10 having a tee 11 band and having a thickness of 0.76 ± 0.08 mm (E) as shown in FIG. 1B, a passive transponder is mounted as shown in FIG. 2A. In other words, the electromagnetic ground of the metal antenna 20 of the transponder toward the magnetic strip 11 toward the magnetic strip 11 so as to prevent interference between the magnetic strip 11 of the credit card 10 and the transponder. Allow sufficient beam to be formed in the slot opening surface.

In addition, the integrated circuit 21 for the transponder may be protected from the text embossing in the PVC-based credit card 10 together with the thin metal antenna 20 as shown in the credit card 10 side view of FIG. 2B. Like 2a, it is arranged between a minimum of 14 mm (F) and a maximum of 19 mm (G) from the edge.

3 and 4 show the structure of the metal antenna 20 mounted on the credit card 10. The passive transponder is an integrated circuit for transponder from a radio frequency band of an interrogator (not shown). 21 obtains the power energy source required for the operation and uses energy to transmit the response code by the metal antenna 20 or the nonlinear element impedance modulation, and the transponder of the credit card type 10 uses the metal antenna 20 And the at least one integrated circuit 21, the structure and characteristics of the metal antenna 20 are determined by the characteristics of the material surrounding the transponder and the required operating frequency.

That is, in the microwave transponder made of a dipole and a slot antenna, as shown in FIGS. 3 and 4, the integrated circuit 21 for the transponder is formed in the center while having a slot structure in the center of the thin metal plate. A slot antenna 22 for high frequency RFID having a wavelength of λ / 4 having a wavelength of λ / 4 is formed, and two slot antennas 22 are disposed at right angles, and a dipole antenna having a dipole structure at both edges of the metal sheet. 23) The metal antenna 20 formed by forming the inside of the wide side based on the magnetic strip 11 of the credit card 10 is used as a general credit card, toll road toll collection system, gas station fee payment, parking lot In the toll collection and parking lot management system, the vehicle is configured to be conveniently used without a separate communication device and access.

The antenna 22 having a thin slotted structure of 400 MHz to 25 GHz high frequency RFID, the antenna 23 having a dipole structure, and the transponder integrated circuit 21 at the center of the slot are magnetic strips as shown in FIGS. 2A and 2B. (11) based on the wide side of the credit card (10) or a variety of pass card embedded in PVC material, and two slot antennas 22 are arranged at right angles in order to increase the transmission gain and reduce the directional problems of the antenna A double polarized wave is formed and two dipole resonant antennas 23 are formed at both edges.

As shown in FIG. 5, a slot antenna 22 corresponding to λ / 4 wavelength is formed in the center using a thin thin copper or similar conductor as an antenna embedded in the credit card 10, and the slot width is 90 degrees downward. By forming a horn-shaped tapered slot antenna 24 that extends to.

In this configuration, for example, a 915MHz or 2.45GHz transponder typically consists of a linear dipole or folded dipole to absorb enough energy to power the integrated circuit 21 and provide a response. Done.

As such, the metal antenna 20 is an important component in an ultra-high frequency RFID transponder, and in the case of a transponder operating at a high frequency (400 MHz to 25 GHz), the most important characteristic is the antenna directivity and the band, and is generally a half-wave or multiple half-wave. It depends on the gain of the dipole antenna.

In general, the micro strip dipole antenna has a very small radiation resistance due to the reduction effect of the strip ground plane with a manck, resulting in low efficiency, which can be overcome by using a thick substrate, but is difficult to manufacture in the form of a credit card.

Accordingly, the present invention implements a tapered slot antenna suitable for use as a long-range RFID transponder metal antenna 20 with a built-in credit card.

The metal antenna 20 is perfectly planar, has an end-fire pattern, obtains high directivity and bandwidth, can be implemented in thin sheets, has a good radiation pattern and a radiation gain, and reduces losses due to TMO surface waves. You can.

The tapered slot antenna 24 emits electromagnetic waves in a direction parallel to the antenna surface as a horn-shaped antenna in which slot widths are stepped.

Here the ground plane is located on the microstrip line because the structure of the tapered slot antenna 24 is similar to the slot line.

Therefore, integrating feeders and matching circuits with antennas is simple, making them suitable for broadband antenna elements for high-frequency transmission and reception devices for long-range recognition. It is.

The received power of the antenna 20 is proportional to the area as in the gain calculation formula of the microstrip antenna. By orthogonally arranging the two slot antennas 22, the directional problem is solved as shown in the directional comparison diagram of FIG. The maximum antenna gain can be obtained by allowing the circuit to be configured.

As described above, the present invention has a constant gain regardless of the transponder direction due to the development of a high-gain dual polarization antenna for a passive transponder for a long-range recognition of a small credit card type. Passive transpond technology that can be applied to high-speed moving object recognition and identification system with semi-permanent lifespan by providing long-range recognition performance with passive credit card type transponder without power supply with gain improvement of about 9dB With the improvement of the system and the emergence of various application systems, the technology can be applied to various fields such as automobile toll collection system, parking management system, access control system, gas station automatic recognition member management system such as highway, etc. without departing from the intention and scope of the present invention. Various embodiments are made in the range Can.

Claims (4)

(correction) In the microwave transponder consisting of a dipole and a slot antenna, a slot for a high frequency RFID in the range of 400 MHz to 25 GHz having a λ / 4 wavelength having a slot structure at the center of a thin metal sheet and having an integrated circuit 21 for transponders at the center thereof. The antenna 22 is formed, and the two slot antennas 22 are disposed at right angles, and the dipole antenna 23 having a dipole structure is formed on both edges of the metal sheet to replace the metal antenna 20 with a credit card 10. Credit card type transponder with a remote recognition system for long-range recognition, characterized in that the inside of the wide side based on the magnetic strip (11) of the). (delete) (correction) 2. The credit card type transformer having a remote recognition system for a long distance recognition according to claim 1, wherein the lower slot width of the slot antenna 22 is formed to form a horn-shaped tapered slot antenna 24. Fonder. (delete)