CN111967562A

CN111967562A - Antenna device on ultrahigh frequency RFID chip

Info

Publication number: CN111967562A
Application number: CN202010902543.8A
Authority: CN
Inventors: 韦强; 张建伟
Original assignee: Shanghai Mingsi Microelectronics Co ltd
Current assignee: Shanghai Mingsi Microelectronics Co ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2020-11-20

Abstract

The invention discloses an on-chip electromagnetic backscattering coupling antenna device which is characterized in that the antenna device can be manufactured together with an ultrahigh frequency chip through a CMOS (complementary metal oxide semiconductor) process, and an independent ultrahigh frequency electronic tag with a transmitting and receiving antenna is formed after the CMOS process is completed; the antenna device can be directly used on a metal surface or other object surfaces capable of interfering with the metal antenna; the antenna device reduces the area of the ultrahigh frequency tag antenna to a millimeter level; the antenna device does not need to connect the chip and the antenna through an inverted packaging technology; the antenna device increases the performance and consistency of the ultrahigh frequency tag.

Description

Antenna device on ultrahigh frequency RFID chip

Technical Field

The invention belongs to the technical field of integrated circuits, in particular to the field of design of ultrahigh frequency RFID chips.

Background

RFID refers to radio frequency identification, which is a communication technology that can identify a specific target and read and write related data through a radio signal without establishing physical or optical contact between an identification system and the specific target. The RFID can be used as a unique identity card of each object, and is also a basis for identifying, communicating and interconnecting each object in the Internet of things. In recent years, with the development of technologies such as large-scale integrated circuits, network communication, information security and the like, the application of RFID systems in our lives is more and more extensive, and RFID electronic tags are one of the technologies.

RFID can be classified into Low Frequency (LF), High Frequency (HF), Ultra High Frequency (UHF) and microwave according to an operating frequency. The ultra-high frequency radio frequency identification (UHF RFID) technology applies the most advanced fourth generation automatic identification technology in the world and has the characteristics of long identification distance, high identification accuracy, high identification speed, strong anti-interference capability, long service life, capability of penetrating through non-metallic materials and the like.

With the development of science and technology, the application of the ultrahigh frequency electronic tag in our daily life is more and more extensive. The ultrahigh frequency electronic tag mainly comprises an ultrahigh frequency tag chip, a reader-writer and an ultrahigh frequency tag antenna, wherein the ultrahigh frequency tag antenna plays a vital role. At present, the size of a common ultrahigh-frequency tag chip on the market is generally millimeter level, while the size of a tag antenna is centimeter level, and the antenna is very large relative to the chip. From the application environment, the more complicated the environment for the tag antenna is due to its wide application, such as metal surface, various liquid environments, etc.

As shown in fig. 1, the uhf chip needs to be connected to an external antenna by an inverted packaging technique: firstly, an antenna substrate is manufactured by an antenna; adding conductive adhesive on the antenna substrate; attaching a chip bump (PAD) to the antenna substrate; solidifying the conductive adhesive in a hot-pressing and curing manner; and finally, testing whether the label works normally. The external antenna has a large area and complicated processes, resulting in high cost. The flip-chip packaging technology also has disadvantages, such as complicated process, high cost, and the conductive adhesive causes different contact areas between the chip and the antenna due to the small chip size, thereby causing a consistency problem between the chip and the chip.

Disclosure of Invention

The invention provides an antenna device on an ultrahigh frequency RFID chip, aiming at reducing the manufacturing cost, widening the application range and manufacturing a competitive ultrahigh frequency electronic tag.

The invention discloses an antenna device on an ultrahigh frequency RFID chip, which is an on-chip electromagnetic backscatter coupling antenna: the antenna is manufactured by a copper metal wire or an aluminum metal wire in a CMOS (complementary metal oxide semiconductor) process; the antenna can be manufactured by using 1 layer of copper metal wire or aluminum metal wire in a CMOS process; the antenna can also be manufactured by using a plurality of layers of copper metal wires or aluminum metal wires in a CMOS process; one form of the antenna is an unclosed specific and regular bending pattern, such as an L-shaped bending pattern; another form of the antenna is a closed specific and regular surrounding pattern, such as a rectangular or square surrounding pattern; the on-chip electromagnetic backscattering coupling antenna and the chip internal circuit form an ultrahigh frequency tag; when the ultrahigh frequency tag works, the on-chip electromagnetic backscattering coupling antenna receives an electromagnetic wave signal sent by the reader-writer and reflects an echo signal to the reader-writer.

The invention discloses an on-chip electromagnetic backscattering coupling antenna device which is characterized in that the antenna device can be manufactured together with an ultrahigh frequency chip through a CMOS (complementary metal oxide semiconductor) process, and an independent ultrahigh frequency electronic tag with a transmitting and receiving antenna is formed after the CMOS process is completed; the antenna device can be directly used on a metal surface; the antenna device reduces the area of the ultrahigh frequency tag antenna to a millimeter level; the antenna device does not need to connect the chip and the antenna through an inverted packaging technology; the antenna device increases the performance and consistency of the ultrahigh frequency tag.

Drawings

Fig. 1 shows that the ultrahigh frequency chip is connected with an external antenna diagram by an inverted packaging technology.

Fig. 2 is a diagram of a complete uhf RFID system.

Fig. 3 and fig. 4 are diagrams of an antenna device on an uhf RFID chip according to the present invention.

Detailed Description

The preferred embodiment is described in detail below with reference to fig. 2, 3 and 4.

As shown in fig. 2, the uhf rfid system is composed of a reader and an uhf electronic tag. A typical reader/writer includes a high frequency module (transmitter and receiver), a control unit, and an antenna device connected to a transponder; the ultrahigh frequency electronic tag is a real data carrier of an ultrahigh frequency radio frequency identification system and generally consists of an external antenna and an ultrahigh frequency chip. And the tag is in a passive state outside the response range of the reader-writer. The tag usually has no power supply of its own, and the tag is supplied with energy only within the response range of the reader/writer. The energy required for tag operation is transmitted to the tag via the antenna as clock pulses and data.

As shown in fig. 3, the present invention relates to an antenna device on a uhf RFID chip, which has a specific and regular meander pattern, such as an L-shaped meander pattern, in a form of an unclosed type. The electromagnetic backscattering coupling antenna on the antenna device chip is formed by winding a copper metal wire or an aluminum metal wire in a CMOS process in a specific and regular bending mode (such as an L-shaped bending pattern) by taking an internal circuit of the chip as a center and taking PAD1 and PAD2 as 2 starting points respectively. When the electromagnetic backscattering coupling antenna on the chip uses a plurality of layers of metal wires or aluminum metal wires, the metal wires of the layers are connected in series.

As shown in fig. 4, another form of the antenna device on the uhf RFID chip of the present invention is a closed specific and regular surrounding pattern, such as a rectangular or square surrounding pattern. With the internal circuit of the chip as the center, the PAD1 and the PAD2 are 2 starting points respectively, a copper metal wire or an aluminum metal wire in the CMOS process is bent and wound in a specific and regular manner, and the 2 bent patterns are connected together by the copper metal wire or the aluminum metal wire in the CMOS process to form a closed loop, so that the on-chip electromagnetic backscatter coupling antenna of the antenna device is formed. When the electromagnetic backscattering coupling antenna on the chip uses a plurality of layers of metal wires of copper or aluminum, the metal wires of the layers are connected in series.

Although the present invention has been described in detail with respect to the preferred embodiments, various modifications and alterations will become apparent to those skilled in the art upon a reading of the foregoing description. The above description and drawings are only examples of the practice of the invention, and it should be understood that the above description is not to be taken as limiting the invention.

Claims

1. The invention discloses an antenna device on an ultrahigh frequency RFID chip, which is an on-chip electromagnetic backscatter coupling antenna: the antenna is manufactured by a copper metal wire or an aluminum metal wire in a CMOS (complementary metal oxide semiconductor) process; the antenna can be manufactured by using 1 layer of copper metal wire or aluminum metal wire in a CMOS process; the antenna can also be manufactured by using a plurality of layers of copper metal wires or aluminum metal wires in a CMOS process; one form of the antenna is an unclosed specific and regular bending pattern, such as an L-shaped bending pattern; another form of the antenna is a closed specific and regular surrounding pattern, such as a rectangular or square surrounding pattern; the on-chip electromagnetic backscattering coupling antenna and the chip internal circuit form an ultrahigh frequency tag; when the ultrahigh frequency tag works, the on-chip electromagnetic backscattering coupling antenna receives an electromagnetic wave signal sent by the reader-writer and reflects an echo signal to the reader-writer.

2. The antenna assembly of claim 1 wherein the antenna assembly is fabricated with the uhf chip using CMOS technology and the CMOS technology is completed to form a separate uhf electronic tag having a transceiver antenna.

3. The antenna device on uhf RFID chips of claim 1, wherein said antenna device is directly usable on metal surfaces.

4. The antenna assembly of claim 1 wherein said antenna assembly reduces the uhf tag antenna area to a millimeter level.

5. The antenna assembly on a uhf RFID chip of claim 1, wherein the antenna assembly does not require a flip-chip technique to connect the chip to the antenna.

6. The antenna assembly on a uhf RFID chip of claim 1, wherein the antenna assembly increases the performance and consistency of the uhf tag.