CN215987340U - High-frequency RFID read-write device with antenna multiplexing - Google Patents
High-frequency RFID read-write device with antenna multiplexing Download PDFInfo
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- CN215987340U CN215987340U CN202122045759.XU CN202122045759U CN215987340U CN 215987340 U CN215987340 U CN 215987340U CN 202122045759 U CN202122045759 U CN 202122045759U CN 215987340 U CN215987340 U CN 215987340U
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Abstract
The utility model discloses a high-frequency RFID read-write device with antenna multiplexing, which comprises: the system comprises a high-frequency RFID read-write array, a radio frequency signal distributor, an antenna and a microcontroller; the high-frequency RFID read-write array comprises at least two high-frequency RFID read-write modules; the radio frequency signal distributor is internally integrated with a plurality of electronic radio frequency switches and comprises at least two radio frequency signal input ports, a radio frequency output port and a microcontroller interface, each high-frequency RFID read-write module is connected with one radio frequency signal input port, the radio frequency output port is connected with an antenna, and the microcontroller is connected with the microcontroller interface. The utility model can support the read-write operation of different RFID cards with various protocol standards or data formats on the same antenna.
Description
Technical Field
The utility model relates to the technical field of radio frequency identification, in particular to a high-frequency RFID read-write device with an antenna multiplexing function, which supports the respective read-write operation of different RFID cards with multiple protocol standards or data formats on the same antenna.
Background
The RFID (Radio Frequency Identification) technology, also called Radio Frequency Identification, is one of automatic Identification technologies, and performs contactless bidirectional data communication in a Radio Frequency manner, and reads and writes an electronic tag or a Radio Frequency card in a Radio Frequency manner, thereby achieving the purpose of identifying a target and exchanging data.
The RFID tags are divided according to working frequency bands, mainly including microwave, ultra high frequency (uhf), High Frequency (HF), low frequency, etc., wherein the typical working frequency of the high frequency RFID is 13.56 Mhz. The high-frequency RFID is widely applied to occasions such as libraries, urban traffic, catering services, entrance guard attendance checking and the like. Due to the fact that the popularization degree of the application is high, a phenomenon that a plurality of organizations issue high-frequency RFID cards exists, in some applications, the same device is required to support the RFID cards issued by a plurality of organizations, and sometimes the implementation difficulty is very high, because:
(1) the technical difficulty problem exists, the high-frequency RFID card has a plurality of different technical standards, the high-frequency RFID card is commonly provided with NFC, ISO14443A, ISO14443B, ISO15693, ISO18000-3M3 and the like, and the technical difficulty is that the same device supports a plurality of standards.
(2) The intellectual property problem exists, for example, mifare1 card follows the ISO14443A standard, but the password authentication is needed before data reading and writing, the triple authentication technology is the PHILIPS patent, and the technical scheme of other manufacturers cannot relate to the details.
(3) There are legal and legal issues, such as the second generation ID card of the people's republic of China, although the ISO14443B standard is followed, but the reading of the ID card data content requires the authorization of the Ministry of public Security.
(4) The data encryption problem exists, for example, "goat city expert" in Guangzhou city, "easy access card" in Xiamen city, etc., because the sensitive data of balance is stored in the card, the encryption process is naturally performed, and the RFID card reader manufactured by other manufacturers is naturally difficult to read the sensitive content.
For the above situation, if the application scenario indeed needs to support multiple RFID cards, in the prior art, multiple independent high-frequency RFID card reading modules are usually integrated in the same device, and each module needs one antenna coil, so that the device console is often difficult to layout, and different cards need to be induced in different antenna areas, which causes great inconvenience to users.
Therefore, it is an urgent need to solve the problem of providing an antenna multiplexing high frequency RFID reader/writer device with simple structure and convenient use.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a high-frequency RFID read/write device with antenna multiplexing, which supports respective read/write operations on different RFID cards with multiple protocol standards or data formats on the same antenna.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an antenna multiplexed high frequency RFID read/write device, comprising: the system comprises a high-frequency RFID read-write array, a radio frequency signal distributor, an antenna and a microcontroller;
the high-frequency RFID read-write array comprises n high-frequency RFID read-write modules; the radio frequency signal distributor is internally integrated with a plurality of electronic radio frequency switches and comprises n radio frequency signal input ports, a radio frequency output port and a microcontroller interface, each high-frequency RFID read-write module is connected with one radio frequency signal input port, the radio frequency output port is connected with the antenna, and the microcontroller is connected with the microcontroller interface;
n is a natural number not less than 2;
the microcontroller is used for controlling the electronic radio frequency switch in the radio frequency signal distributor, so that the radio frequency signal between the radio frequency output port and any one of the radio frequency signal input ports has low impedance characteristic, and the radio frequency signals between the other radio frequency signal input ports and the other radio frequency signal output ports have high impedance characteristic.
Each high-frequency RFID read-write module at least supports one protocol standard and at least supports one data format.
Preferably, the radio frequency signal distributor is an HMC544AE integrated circuit chip, the 1 st pin and the 3 rd pin are radio frequency signal input ports, the 4 th pin and the 6 th pin are microcontroller interfaces, the 5 th pin is a radio frequency output port, and an integrated electronic radio frequency switch is integrated inside.
Preferably, the radio frequency signal distributor comprises n identical branches, each branch comprises a PIN diode and a peripheral circuit, and the PIN diodes are electronic radio frequency switches. In the above, n is a natural number not less than 2 and is equal to the number of the high frequency RFID read/write modules.
Preferably, the radio frequency signal distributor comprises n identical branches, each branch comprises a first capacitor C11, a PIN diode D1, a second capacitor C12, a first inductor L11, a second inductor L12, a first resistor R11, a second resistor R12 and a field effect transistor Q1, one end of the first capacitor C11 is a radio frequency signal input port, the other end of the first capacitor C11 is connected with the anode of the PIN diode D1, the cathode of the PIN diode D1 is connected with one end of the second capacitor C12, the other end of the second capacitor C12 is a radio frequency output port, the field effect transistor Q1 is a PMOS transistor, the source thereof is connected with the anode of a power supply, the gate thereof is a microcontroller interface and is connected with the microcontroller, the drain thereof is connected in series with the second resistor R12 and the first inductor L11 and then is connected with the common end of the PIN diode D1 and the first capacitor C11, and a first resistor R11 is further connected between the source of the field effect transistor Q1, one end of the second inductor L12 is connected to the common terminal of the PIN diode D1 and the second capacitor C12, and the other end is grounded.
According to the technical scheme, compared with the prior art, the high-frequency RFID read-write device with the antenna multiplexing has the advantages that at least two high-frequency RFID read-write modules share the same antenna, the high-frequency RFID read-write modules can work in a time-sharing mode and do not interfere with each other, and therefore different RFID cards with various protocol standards or data formats can be read and written on the same antenna.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a circuit block diagram of a high frequency RFID read/write device with antenna multiplexing according to the present invention.
Fig. 2 is a circuit diagram of embodiment 1.
Fig. 3 is a circuit diagram of embodiment 2.
The system comprises a high-frequency RFID read-write array 1, a radio-frequency signal distributor 2, an antenna 3, an antenna 4 and a microcontroller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the embodiment of the present invention discloses a high frequency RFID read-write device with antenna multiplexing, which includes a high frequency RFID read-write array 1, a radio frequency signal distributor 2, an antenna 3 and a microcontroller 4. The high-frequency RFID read-write array 1 comprises n high-frequency RFID read-write modules, each high-frequency RFID read-write module at least supports one protocol standard and at least supports one data format, the data format can be encrypted or unencrypted, and the high-frequency RFID read-write modules do not comprise antennas but respectively comprise antenna interfaces. The radio frequency signal distributor 2 comprises a microcontroller interface, n radio frequency input ports and a radio frequency output port, an electronic radio frequency switch is integrated in the radio frequency signal distributor, and the microcontroller 4 can control the electronic radio frequency switch integrated in the radio frequency signal distributor, so that the radio frequency signal between the radio frequency output port and any one of the radio frequency signal input ports is in a low impedance characteristic, the radio frequency signal between the other radio frequency signal input ports and the other radio frequency signal output ports is in a high impedance characteristic, and any one of the n radio frequency input ports is selected to be connected to the radio frequency output port.
In the above, n is a natural number greater than 1.
In the above, the specific implementation of the high-frequency RFID read-write module and the antenna adopts the prior art scheme, which is not described in detail.
Each high-frequency RFID read-write module in the high-frequency RFID read-write array is connected to one radio-frequency input port of the radio-frequency signal distributor 2 through an antenna interface of the high-frequency RFID read-write module; the radio frequency output port of the radio frequency signal distributor is connected to the antenna 3; the radio frequency signal distributor is also connected to the above mentioned microcontroller 4 via a microcontroller interface. Special embedded software is further solidified in the microcontroller 4, in the using process, the software controls an electronic radio frequency switch in the radio frequency signal distributor 2 according to application requirements, one of the n high-frequency RFID read-write modules is selected to be connected to the antenna 3, and meanwhile, other high-frequency RFID read-write modules are disconnected from the antenna, so that time-sharing operation is achieved, and mutual interference is avoided. The embedded software adopts conventional technical means, which is not described in detail.
More specifically, one embodiment of the rf signal distributor 2 is shown in fig. 2, where the rf signal distributor 2 is composed of an integrated circuit chip 21 and necessary peripheral circuits, and the integrated circuit chip 21 has a model number of HMC544 AE. The HMC544AE is a single-pole double-throw electronic rf switch, in which the 5 th pin is a common terminal for rf signals, the 1 st and 3 rd pins are two other contacts of the rf switch, and the 4 th and 6 th pins are control pins. In this embodiment, the 5 th pin is used as a radio frequency output port of the radio frequency signal distributor 2 and connected to the antenna, the 1 st pin and the 3 rd pin are respectively used as two radio frequency input ports of the radio frequency signal distributor 2 and respectively connected to the high frequency RFID read-write module 1 and the high frequency RFID read-write module 2, and the 4 th pin and the 6 th pin are respectively connected to different pins of the microcontroller 4 as microcontroller interfaces. When the 4 th pin of the HMC544AE inputs a low level and the 6 th pin inputs a high level, the radio frequency signal between the 5 th pin and the 1 st pin is of a low impedance (on), and the radio frequency signal between the 5 th pin and the 3 rd pin is of a high impedance (off), corresponding to the state that the antenna is connected to the high-frequency RFID read-write module 1; when the 4 th pin of the HMC544AE inputs a high level and the 6 th pin inputs a low level, the radio frequency signal between the 5 th pin and the 3 rd pin is of a low impedance (on), and the radio frequency signal between the 1 st pin and the 5 th pin is of a high impedance (off), corresponding to the state that the antenna is connected to the high-frequency RFID read-write module 2; the other states of the 4 th and 6 th pins are combined into an invalid state, and the software operation needs to avoid using the invalid state.
In another embodiment, the rf signal distributor includes n identical branches, each branch includes a PIN diode and a peripheral circuit, the PIN diode is an electronic rf switch, one embodiment of which is shown in fig. 3, wherein the rf signal distributor includes n identical branches, each branch has a PIN diode, and according to the characteristics of the PIN diodes, when a sufficient forward dc voltage is applied across the PIN diodes, the rf signal exhibits a low impedance characteristic, which can be regarded as an on state of the rf switch, and when no dc voltage is applied across the PIN diodes or a reverse dc voltage is applied across the PIN diodes, the rf signal exhibits a high impedance characteristic, which can be regarded as an off state of the rf switch, which has the characteristics of the PIN diodes. In this implementation, each branch includes a first capacitor C11, a PIN diode D1, a second capacitor C12, a first inductor L11, a second inductor L12, a first resistor R11, a second resistor R12, and a field-effect transistor Q1, one end of the first capacitor C11 is a radio frequency signal input port, the other end of the first capacitor C11 is connected to an anode of the PIN diode D1, a cathode of the PIN diode D1 is connected to one end of the second capacitor C12, the other end of the second capacitor C12 is a radio frequency output port, the field-effect transistor Q1 is a PMOS transistor, the source electrode of the field effect transistor Q1 is connected with the anode of a power supply, the grid electrode of the field effect transistor is connected with the microcontroller through a microcontroller interface, the drain electrode of the field effect transistor Q1 is connected with a second resistor R12 and a first inductor L11 in series and then connected with the common end of a PIN diode D1 and a first capacitor C11, a first resistor R11 is further connected between the source electrode and the grid electrode of the field effect transistor Q1, one end of a second inductor L12 is connected with the common end of the PIN diode D1 and the second capacitor C12, and the other end of the second inductor L12 is grounded. In this embodiment, when a high level is input to a microcontroller interface (fet gate) of a certain branch, a source and a drain of the fet Q1 are turned on, a current flows from a positive power supply to ground through the fet Q1, the second resistor R12, the first inductor L11, the PIN diode D1, and the second inductor L12, and a forward dc bias voltage is present across the PIN diode D1, which is in a radio frequency on state. Please note that the first inductor L11 and the second inductor L12 have the characteristics of "direct current and alternating current resistance", and under the condition that the parameters are reasonably selected, the impedance of the direct current loop in which the inductors are located is very high in the 13.56Mhz frequency band, and the influence on the radio frequency signal is negligible.
In fig. 3, the number of n is specifically set to 3, but is not limited to this, and the remaining number of n is 2 or more may be set according to actual requirements.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. An antenna multiplexing high-frequency RFID read-write device is characterized by comprising: the system comprises a high-frequency RFID read-write array, a radio frequency signal distributor, an antenna and a microcontroller;
the high-frequency RFID read-write array comprises n high-frequency RFID read-write modules; the radio frequency signal distributor is internally integrated with an electronic radio frequency switch and comprises n radio frequency signal input ports, a radio frequency output port and a microcontroller interface, each high-frequency RFID read-write module is connected with one radio frequency signal input port, the radio frequency output port is connected with the antenna, and the microcontroller is connected with the microcontroller interface;
n is a natural number not less than 2;
the microcontroller is used for controlling the electronic radio frequency switch to enable the radio frequency signal between the radio frequency output port and any one of the radio frequency signal input ports to have low impedance characteristic.
2. The antenna multiplexing high frequency RFID read-write equipment according to claim 1, wherein each high frequency RFID read-write module supports at least one protocol standard and at least one data format.
3. The antenna multiplexing high-frequency RFID read-write device according to claim 1 or 2, wherein the radio frequency signal distributor is an HMC544AE IC chip, pins 1 and 3 of the HMC544AE IC chip are radio frequency signal input ports, pins 4 and 6 are microcontroller interfaces, pin 5 is a radio frequency output port, and an electronic radio frequency switch is integrated inside the device.
4. The antenna multiplexing high-frequency RFID read-write equipment according to claim 1 or 2, characterized in that the radio frequency signal distributor comprises n identical branches, each branch comprises a PIN diode and peripheral circuits, and the PIN diode is an electronic radio frequency switch.
5. The antenna multiplexing high frequency RFID read/write device as claimed in claim 4, wherein each branch comprises a first capacitor C11, a PIN diode D1, a second capacitor C12, a first inductor L11, a second inductor L12, a first resistor R11, a second resistor R12 and a field effect transistor Q1, one end of the first capacitor C11 is a radio frequency signal input port, the other end is connected with the anode of the PIN diode D1, the cathode of the PIN diode D1 is connected with one end of the second capacitor C12, the other end of the second capacitor C12 is a radio frequency output port, the field effect transistor Q1 is a PMOS transistor, the source thereof is connected with the anode of a power supply, the gate thereof is a microcontroller interface and is connected with the microcontroller, the drain thereof is connected in series with the second resistor R12 and the first inductor L11 and then connected with the common end of the second capacitor D1 and the first capacitor C11, the first resistor R11 is connected between the source and the gate of the field effect transistor Q1, one end of the second inductor L12 is connected to the common terminal of the PIN diode D1 and the second capacitor C12, and the other end is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122045759.XU CN215987340U (en) | 2021-08-27 | 2021-08-27 | High-frequency RFID read-write device with antenna multiplexing |
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| CN202122045759.XU CN215987340U (en) | 2021-08-27 | 2021-08-27 | High-frequency RFID read-write device with antenna multiplexing |
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| CN215987340U true CN215987340U (en) | 2022-03-08 |
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| CN202122045759.XU Active CN215987340U (en) | 2021-08-27 | 2021-08-27 | High-frequency RFID read-write device with antenna multiplexing |
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