Low-power high-frequency station reader-writer

Abstract

The utility model relates to the technical field of RFID equipment, in particular to a low-power high-frequency station reader-writer, which comprises a bottom shell and a surface shell which are combined to form a cavity. A circuit board and a circularly polarized antenna unit are arranged in the cavity; the circularly polarized antenna unit is attached to the surface shell; the circuit board is provided with an MCU unit, and the MCU unit is electrically connected with the RF control unit, the communication unit, the power conversion unit and the interface unit. The RFSOC unit, the automatic tuning oscillation unit and the circularly polarized antenna unit are electrically connected in sequence; the RF SOC unit is electrically connected to the RF control unit. According to the RFID reader-writer, the problem that the frequency of the RFID device is fixed is solved, the remarkable beneficial effects of reducing interference, improving reliability and compatibility and the like are achieved, and the performance and user experience of the RFID reader-writer in practical application are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to RFID equipment technical field, concretely is a kind of low-power high-frequency workstation reader. BACKGROUND

[0002] RFID is called radio frequency identification technology in Chinese, and the full name in English is Radio Frequency IDentification (RFID). It is a kind of wireless communication technology. RFID system is a set of hardware equipment based on RFID technology, and has rich industrial uses.

[0003] Low-power high-frequency workstation reader is used to transmit signal to activate tag, and read or write data in tag. The data interface commonly used by the device is RS232 and RS485, which is used to connect with back-end computer and transfer data and control through the interface.

[0004] The current workstation reader (RFID) cannot be automatically tuned, so its working frequency is fixed and cannot be adjusted according to the environment. The radio frequency of RFID equipment is easy to interfere with other electronic equipment, and also easy to be interfered. Therefore, in view of the above problems, we propose a low-power high-frequency workstation reader to at least partially solve the above problems. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of low-power high-frequency workstation reader to at least partially solve the above problems.

[0006] To achieve the above purpose, the utility model provides the following technical scheme:

[0007] Bottom shell and face shell form a cavity by combination;Circuit board and circularly polarized antenna unit are arranged in the cavity;The circularly polarized antenna unit is attached to the face shell;

[0008] MCU unit is arranged on the circuit board, and the MCU unit is electrically connected to RF control unit, communication unit, power conversion unit and interface unit;

[0009] RF_SOC unit, automatic tuning oscillator unit and circularly polarized antenna unit are electrically connected in sequence;The RF_SOC unit is electrically connected to the RF control unit.

[0010] Optionally, the face shell is provided with a read-write area corresponding to the position of the circularly polarized antenna unit, and a lamp hole is arranged on one side of the read-write area;

[0011] Indicating lamp electrically connected to the MCU unit is arranged on the circuit board;The indicating lamp is arranged relative to the lamp hole, and the lamp hole is provided with a lens.

[0012] Optionally, one side of the bottom shell is provided with a connector;

[0013] The connector is electrically connected to the circuit board, for providing external power supply, data, communication and control port.

[0014] Optionally, the circuit board is connected to the bottom shell through a first copper column, and connected to the face shell through a second copper column.

[0015] Optionally, the power conversion unit comprises an input circuit, a power supply circuit and a POE circuit;

[0016] The power supply circuit comprises a first power supply circuit for converting 9-24VDC into 5VDC and a second power supply circuit for converting 5VDC into 3.3VDC;

[0017] The output ends of the input circuit and the POE circuit are electrically connected to the input end of the first power supply circuit;

[0018] The POE circuit is electrically connected to the RJ45 network interface provided by the interface unit.

[0019] Optionally, the interface unit further comprises a dry contact circuit unit:

[0020] The dry contact circuit unit comprises a first triode, the collector of which is electrically connected to a 5V power supply position through a trigger end of a relay, the emitter of which is connected to ground, and the base of which is electrically connected to the MCU unit;

[0021] The execution end of the relay provides a normally open end, a normally closed end and a common end.

[0022] Optionally, the collector of the first triode is electrically connected to the anode of a first diode and the second pin of the transmitter;

[0023] The cathode of the first diode is electrically connected to the 5V power supply position and the first pin of the trigger end.

[0024] Optionally, the automatic tuning oscillation unit comprises a signal receiving negative channel and a signal receiving positive channel electrically connected between the RF_SOC chip and the circularly polarized antenna unit, and a first signal transmitting channel and a second signal transmitting channel;

[0025] The first signal transmitting channel comprises a coupling inductor, one end of which is electrically connected to the RF_SOC chip, and the other end of which is electrically connected to one end of a first coupling capacitor;

[0026] The signal receiving negative channel comprises a second coupling capacitor, one end of which is electrically connected to the RF_SOC chip, and the other end of which is electrically connected to one end of a first resistor;

[0027] The other end of the first coupling capacitor and the other end of the first resistor are electrically connected, and the first end of the circularly polarized antenna unit is electrically connected, and grounded through a first filtering capacitor;

[0028] The coupling inductor and the first coupling capacitor are grounded through a second filtering capacitor and a third filtering capacitor;

[0029] The signal receiving positive channel and the second signal transmitting channel have the same circuit structure and are symmetrically arranged with the signal receiving negative channel and the first signal transmitting channel respectively;

[0030] The signal receiving positive channel and the second signal transmitting channel are electrically connected to the second end of the circularly polarized antenna unit;

[0031] The third end of the circularly polarized antenna unit is grounded through a filtering resistor.

[0032] Compared with the prior art, the utility model has the beneficial effects that:

[0033] In the utility model, the bottom shell and the surface shell are combined to form a cavity, and the cavity is internally provided with a circuit board and a circularly polarized antenna unit; the circularly polarized antenna unit is arranged on the surface shell; the circuit board is provided with an MCU unit, and the MCU unit is electrically connected to an RF control unit, a communication unit, a power conversion unit and an interface unit; the RF_SOC unit, the automatic tuning oscillation unit and the circularly polarized antenna unit are sequentially electrically connected; and the RF_SOC unit is electrically connected to the RF control unit. Not only the frequency fixation problem of the RFID device is solved, but also remarkable beneficial effects such as reducing interference, improving reliability and compatibility are brought, and the performance and user experience of the RFID reader in practical application are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is an explosion structure schematic view of a small-power high-frequency workstation reader provided in an embodiment of the utility model;

[0035] Figure 2 It is an MCU unit circuit structure schematic view of a small-power high-frequency workstation reader provided in an embodiment of the utility model;

[0036] Figure 3 It is a buzzer circuit structure schematic view of a small-power high-frequency workstation reader provided in an embodiment of the utility model;

[0037] Figure 4 It is an input circuit structure schematic view of a small-power high-frequency workstation reader provided in an embodiment of the utility model

[0038] Figure 5A first power circuit structure schematic view of a low-power high-frequency workstation reader is provided for an embodiment of the utility model;

[0039] Figure 6 A second power circuit structure schematic view of a low-power high-frequency workstation reader is provided for an embodiment of the utility model;

[0040] Figure 7 A dry contact circuit structure schematic view of a low-power high-frequency workstation reader is provided for an embodiment of the utility model;

[0041] Figure 8 An RF control unit circuit structure schematic view of a low-power high-frequency workstation reader is provided for an embodiment of the utility model

[0042] Figure 9 An RF_SOC unit circuit structure schematic view of a low-power high-frequency workstation reader is provided for an embodiment of the utility model;

[0043] Figure 10 An automatic tuning oscillation unit circuit structure schematic view of a low-power high-frequency workstation reader is provided for an embodiment of the utility model;

[0044] Figure 11 A circularly polarized antenna unit circuit structure schematic view of a low-power high-frequency workstation reader is provided for an embodiment of the utility model.

[0045] In the figure: 101, bottom shell;102, face shell;103, circuit board;104, circularly polarized antenna unit;105, connecting head;106, lens;107, first copper column;108, second copper column;121, read-write area;122, lamp hole;131, indicator lamp. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0047] Please refer to Figure 1The utility model discloses a kind of low-power high-frequency workstation reader, comprising: bottom shell 101 and face shell 102, two form a cavity formed by combination;Circuit board 103 and circular polarized antenna unit 104 are equipped in the inside of the cavity;The circular polarized antenna unit 104 is attached to the face shell 102 setting;MCU unit is equipped on the circuit board 103, and the MCU unit is electrically connected to RF control unit, communication unit, power conversion unit and interface unit;RF_SOC unit, automatic tuning oscillation unit and circular polarized antenna unit 104 are electrically connected in sequence;The RF_SOC unit is electrically connected to the RF control unit.

[0048] In the embodiment, by introducing automatic tuning oscillation unit, effectively solve the technical problem that workstation reader (RFID) cannot automatically tune working frequency. Specifically, automatic tuning oscillation unit can automatically adjust the working frequency of RFID device according to environmental changes, avoiding the problem of radio frequency interference that may be generated under fixed frequency. This dynamic frequency adjustment capability makes the RFID reader better adapt to different working environments, reduces the interference to other electronic devices, and also enhances the anti-interference ability of itself. When working in different environments, the circuit parameters can be automatically adjusted, so that the influence of external environment on the read-write distance is minimized, and the anti-interference ability of the device itself is further enhanced. The reader integrates industrial ModbusTCP / Rtu protocol, is compatible with current mainstream PLC controllers, and can be widely used in production tracking, AGV car positioning, logistics sorting, process control, mechanical arm station control and other fields.

[0049] As a preferred embodiment, the face shell 102 is provided with a read-write area 121 corresponding to the position of the circular polarized antenna unit 104, one side of the read-write area 121 is provided with a lamp hole 122, and the circuit board 103 is provided with an indicator lamp 131 electrically connected to the MCU unit; The indicator lamp 131 is arranged relative to the lamp hole 122, and the lamp hole 122 is provided with a lens 106.

[0050] The above-mentioned indicator lamp 131 is matched with the lamp hole 122 and the lens 106, which more directly displays the device state, and the setting of the above-mentioned read-write area 121 optimizes the alignment of the antenna and the label, and improves the read-write success rate. When it is applied in a logistics warehouse, workers can quickly locate the working state of the reader, and improve work efficiency.

[0051] As a preferred embodiment, one side of the bottom shell 101 is provided with a connecting head 105; The connecting head 105 is electrically connected to the circuit board 103, for providing external power supply, data, communication and control port. The above-mentioned connecting head provides external power supply and data communication, which simplifies the device installation and maintenance process; The integration of the above-mentioned data, communication and control port facilitates the integration with other systems.

[0052] As an example, the circuit board is further provided with a USB circuit for providing a USB interface, an RS485 circuit for providing a 485 terminal, a TCP / IP network circuit for providing an RJ45 interface, and an RS232 circuit for providing a serial interface; the USB interface, the 485 terminal, the RJ45 interface, the serial interface, and the power interface provided by the power conversion unit are connected to the cable through the connector 105 provided on the side surface of the bottom shell 101, and the cable can be connected to the connector 105 through the threaded hole.

[0053] As a more preferred embodiment, the circuit board 103 is connected to the bottom shell 101 through the first copper column 107 and connected to the face shell 102 through the second copper column 108.

[0054] The first copper column 107 and the second copper column 108 enable the circuit board 103 to be stably positioned in the cavity, thereby enhancing the stability of the circuit board, reducing the direct conduction of vibration to the circuit board 103, and preventing the components on the circuit board 103 from being easily damaged. In addition, the metal column helps dissipate heat and prolongs the service life of the device. For example, in the automated production line of the manufacturing industry, the reader / writer needs to be operated stably for a long time, and the copper column connection ensures the reliability and durability of the device.

[0055] As a more preferred embodiment, the power conversion unit includes an input circuit, a power circuit, and a POE circuit; as shown in Figures 4 to 6 The power circuit includes a first power circuit for converting 9-24VDC to 5VDC and a second power circuit for converting 5VDC to 3.3VDC; the output ends of the input circuit and the POE circuit are electrically connected to the input end of the first power circuit; the POE circuit is electrically connected to the RJ45 network interface provided by the interface unit. The POE circuit and the input circuit are electrically connected to the power circuit as the power input end, for providing two power supply modes; the power circuit is electrically connected to the MCU unit as the master control circuit; the power circuit includes a first power circuit for converting 9-24VDC to 5VDC and a second power circuit for converting 5VDC to 3.3VDC; the POE circuit and the input circuit are respectively electrically connected to the RJ45 interface and the power interface, and are respectively electrically connected to the first power circuit.

[0056] As an example, as shown in Figure 4 The input circuit specifically includes a pressure-sensitive resistor RV1, a TVS diode D38, and a fuse F3 electrically connected to the input end of the conjugate inductor T1; the output end of the conjugate inductor T1 is electrically connected to the anodes of the rectifier diodes D43 and D44, and the cathodes of the rectifier diodes D43 and D44 are the output end of the input circuit; as shown in Figure 5As shown, the first power supply circuit is mainly composed of the first power supply chip U6, and the energy storage inductor L1 and a plurality of filter capacitors C6 and C29 are connected to the output end of the first power supply chip U6. The energy storage inductor L1 is preferably 10 μH, and the filter capacitors C6 and C29 are preferably 22 μF and 0.1 μH respectively, so that the output 5V DC is more stable. The input end can accept a wide voltage input of 9-24V, which can prevent the voltage at the input end from being unstable. Figure 6 As shown, the second power supply circuit is composed of the second power supply chip U3, which is used to convert 5V into 3.3V for power supply.

[0057] It should be noted that the TVS tube, i.e. the transient voltage suppression diode, is a kind of overvoltage protection device with bidirectional voltage stabilization and bidirectional negative resistance characteristics, which is similar to a pressure-sensitive resistor. It is applied to various AC and DC power supply circuits to suppress transient overvoltage. When a surge pulse voltage occurs in the protected circuit, the bidirectional breakdown diode can quickly Zener breakdown, changing from a high resistance state to a low resistance state, and shunting and clamping the surge voltage, thereby protecting the elements in the circuit from being damaged by the transient surge pulse voltage.

[0058] As a more preferred embodiment, as shown in Figure 7 As shown, the interface unit further comprises a dry contact circuit unit, which comprises a first triode Q4, the collector of which is electrically connected to the 5V power supply position through the trigger end of the relay S1, the emitter is connected to ground, and the base is electrically connected to the MCU unit; the execution end of the relay S1 provides a normally open end NO1, a normally closed end NC1 and a common end CM1.

[0059] Further, the collector of the first triode Q4 is electrically connected to the anode of the first diode D10 and the second pin of the trigger end of the relay S1; the cathode of the first diode D10 is electrically connected to the 5V power supply position and the first pin of the trigger end of the relay S1.

[0060] The dry contact can be used to provide equipment linkage signals, for example, when reading information, the MCU unit sends a signal to the first triode Q4, which controls the normally open and normally closed of the relay S1 through the conduction or cutoff of the collector and emitter of the first triode Q4, so as to generate relevant closing or shutdown signals, which can be used as dry contact input signals of other equipment, thereby triggering the linkage mechanism. The dry contact circuit provides rich control options and enhances the automation control capability of the equipment. For example, in a security system, the reader can be linked with the access control system to realize automatic door opening or alarm and improve security.

[0061] As a more preferred embodiment, as shown in Figures 8 to 11As shown, the RF control unit is mainly composed of an RF control chip U1, such as Figure 8 As shown, the RF control chip U1 is preferably STM32F103CBT6; the RF control chip U1 is used to control the RF_SOC unit; as shown, Figure 9 As shown, the RF_SOC unit is composed of an RF_SOC chip U9; the automatic tuning oscillation unit includes a signal receiving negative channel and a signal receiving positive channel electrically connected between the RF_SOC chip U9 and the circularly polarized antenna unit 104, and a first signal sending channel and a second signal sending channel; the end of the signal receiving negative channel and the first signal sending channel is electrically connected; the first signal sending channel includes a coupling inductor L2, one end of which is electrically connected to the RF_SOC chip U9, and the other end of which is electrically connected to one end of a first coupling capacitor C42; the signal receiving negative channel includes a second coupling capacitor C37, one end of which is electrically connected to the RF_SOC chip U9, and the other end of which is electrically connected to one end of a first resistor R32; the other end of the first coupling capacitor C42 and the other end of the first resistor R32 are electrically connected, and are electrically connected to a first end of the circularly polarized antenna unit 104, and are grounded through a first filter capacitor C66; the coupling inductor L2 and the first coupling capacitor C42 are grounded through a second filter capacitor C55 and a third filter capacitor C62; the signal receiving positive channel and the second signal sending channel have the same circuit structure as the signal receiving negative channel and the first signal sending channel respectively, and are symmetrically arranged, as shown, Figure 10 As shown, the second signal sending channel includes a coupling inductor L3, one end of which is electrically connected to the RF_SOC chip U9, and the other end of which is electrically connected to one end of a third coupling capacitor C54; the signal receiving positive channel includes a fourth coupling capacitor C51, one end of which is electrically connected to the RF_SOC chip U9, and the other end of which is electrically connected to one end of a second resistor R33; the other end of the third coupling capacitor C54 and the other end of the second resistor R33 are electrically connected, and are electrically connected to a second end of the circularly polarized antenna unit 104, and are grounded through a fourth filter capacitor C68; the coupling inductor L2 and the first coupling capacitor C42 are grounded through a fifth filter capacitor C56 and a sixth filter capacitor C63; as shown, Figure 10 As shown, the automatic tuning oscillation unit provides a connection port CON3 for connecting to the interface CON3 provided by the circularly polarized antenna unit 104; the ends of the signal receiving positive channel and the second signal sending channel are electrically connected to the second end of the circularly polarized antenna unit 104; the middle part of the circularly polarized antenna unit 104 provides a third end for grounding connection through a filter resistor R36, as shown, Figure 11As shown, one end (outer side) of the antenna of the circularly polarized antenna unit 104 is electrically connected to one end of the filter resistor R34, the other end of the filter resistor R34 is electrically connected to the interface CON3 provided by the circularly polarized antenna unit 104, the other end of the antenna of the circularly polarized antenna unit 104 is electrically connected to one end of the filter resistor R35, the other end of the filter resistor R34 is electrically connected to the interface CON3 provided by the circularly polarized antenna unit 104, the filter resistors R35, R35, and R36 are preferably 0.47Ω, the filter capacitor C57 and the filter capacitor C59 are electrically connected between the other end of the filter resistor R34 and the other end of the filter resistor R36, and the filter capacitor C58 and the filter capacitor C61 are electrically connected between the other end of the filter resistor R34 and the other end of the filter resistor R36, and the filter capacitors C57, C58, C59, and C61 are preferably 82pF.

[0062] The optimization of the RF_SOC and the automatic tuning circuit improves the transmission and reception efficiency of the signal and enhances the performance of the reader / writer. Through the use of filter and coupling capacitors, the anti-interference ability of the device is improved.

[0063] The circularly polarized antenna unit 104 is an RFID high-gain circularly polarized antenna unit, and its working principle is as follows: the MCU on the mainboard 103 controls the RFID radio frequency circuit to obtain a radio frequency signal, the radio frequency signal is amplified and diffused by the RFID radio frequency antenna of the circularly polarized antenna unit 104, after the RFID electronic tag receives the signal, it exchanges data with the reader / writer through the air protocol, and after obtaining the data of the RFID electronic tag, the main control chip MCU on the mainboard 103 will take corresponding actions, such as controlling the buzzer to sound, or transmitting the data through the external interface.

[0064] As shown, Figure 3 The buzzer circuit further includes a second triode Q6, the collector of which is electrically connected to a 3.3V power supply position, the emitter of which is electrically connected to one end of the buzzer, and the other end of the buzzer is grounded to form a loop; a buzzer control loop is formed from the 3.3V position to the collector of the second triode Q6, to the base of the second triode Q6, and then to the current-limiting resistor R31 to the MCU chip, according to the signal control of the MCU chip, the second triode Q6 processes, and the corresponding sound is output through the buzzer, specifically, when the reader / writer reads the RFID tag, the base of the second triode Q6 is controlled by the MCU to have high and low levels, thereby controlling the buzzer to emit sound.

[0065] As a preferred embodiment, the bottom shell 101 and the face shell 102 are made of ABS or PC materials, and a sealing ring is used in cooperation, so that the above-mentioned protection level can at least reach a high protection level of IP65.

[0066] The beneficial effects of the present application mainly include:

[0067] Reduce interference: The automatic tuning function allows the reader to automatically select the optimal working frequency according to the environment, avoiding frequency overlap with other electronic devices and reducing mutual interference.

[0068] Improve reliability: Dynamic frequency adjustment improves the working reliability of the RFID reader in complex environments, maintaining stable reading and writing performance even in scenes with multiple radio frequency interferences.

[0069] Enhance compatibility: Automatic tuning enables the reader to adapt to a wider range of working environments, improving compatibility with different RFID tags and enhancing the overall performance of the system.

[0070] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low power high frequency station reader, characterized by, The application relates to a circularly polarized antenna device, which comprises a bottom shell and a face shell, and a cavity is formed by the combination of the two shells; a circuit board and a circularly polarized antenna unit are arranged in the cavity; the circularly polarized antenna unit is attached to the face shell; an MCU unit is arranged on the circuit board and is electrically connected to an RF control unit, a communication unit, a power conversion unit and an interface unit; an RF_SOC chip, an automatic tuning oscillation unit and the circularly polarized antenna unit are sequentially electrically connected; the RF_SOC chip is electrically connected to the RF control unit; a read-write area is arranged on the face shell at a position corresponding to the circularly polarized antenna unit; a lamp hole is arranged on one side of the read-write area; an indicating lamp electrically connected to the MCU unit is arranged on the circuit board; the indicating lamp is arranged relative to the lamp hole; and the lamp hole is provided with a lens. The application further relates to a circularly polarized antenna device, which comprises a bottom shell and a face shell, and a cavity is formed by the combination of the two shells; a circuit board and a circularly polarized antenna unit are arranged in the cavity; an MCU unit is arranged on the circuit board and is electrically connected to an RF control unit, a communication unit, a power conversion unit and an interface unit; an RF_SOC chip, an automatic tuning oscillation unit and the circularly polarized antenna unit are sequentially electrically connected; the RF_SOC chip is electrically connected to the RF control unit; a read-write area is arranged on the face shell at a position corresponding to the circularly polarized antenna unit; a lamp hole is arranged on one side of the read-write area; an indicating lamp electrically connected to the MCU unit is arranged on the circuit board; the indicating lamp is arranged relative to the lamp hole; and the lamp hole is provided with a lens. The application further relates to a circularly polarized antenna device, which comprises a bottom shell and a face shell, and a cavity is formed by the combination of the two shells; a circuit board and a circularly polarized antenna unit are arranged in the cavity; an MCU unit is arranged on the circuit board and is electrically connected to an RF control unit, a communication unit, a power conversion unit and an interface unit; an RF_SOC chip, an automatic tuning oscillation unit and the circularly polarized antenna unit are sequentially electrically connected; the RF_SOC chip is electrically connected to the RF control unit; a read-write area is arranged on the face shell at a position corresponding to the circularly polarized antenna unit; a lamp hole is arranged on one side of the read-write area; an indicating lamp electrically connected to the MCU unit is arranged on the circuit board; the indicating lamp is arranged relative to the lamp hole; and the lamp hole is provided with a lens. The application further relates to a circularly polarized antenna device, which comprises a bottom shell and a face shell, and a cavity is formed by the combination of the two shells; a circuit board and a circularly polarized antenna unit are arranged in the cavity; an MCU unit is arranged on the circuit board and is electrically connected to an RF control unit, a communication unit, a power conversion unit and an interface unit; an RF_SOC chip, an automatic tuning oscillation unit and the circularly polarized antenna unit are sequentially electrically connected; the RF_SOC chip is electrically connected to the RF control unit; a read-write area is arranged on the face shell at a position corresponding to the circularly polarized antenna unit; a lamp hole is arranged on one side of the read-write area; an indicating lamp electrically connected to the MCU unit is arranged on the circuit board; the indicating lamp is arranged relative to the lamp hole; and the lamp hole is provided with a lens.

2. A low power high frequency workbench reader writer according to claim 1, characterized in that, The application further relates to a circularly polarized antenna device, which comprises a bottom shell and a face shell, and a cavity is formed by the combination of the two shells; a circuit board and a circularly polarized antenna unit are arranged in the cavity; an MCU unit is arranged on the circuit board and is electrically connected to an RF control unit, a communication unit, a power conversion unit and an interface unit; an RF_SOC chip, an automatic tuning oscillation unit and the circularly polarized antenna unit are sequentially electrically connected; the RF_SOC chip is electrically connected to the RF control unit; a read-write area is arranged on the face shell at a position corresponding to the circularly polarized antenna unit; a lamp hole is arranged on one side of the read-write area; an indicating lamp electrically connected to the MCU unit is arranged on the circuit board; the indicating lamp is arranged relative to the lamp hole; and the lamp hole is provided with a lens. The application further relates to a circularly polarized antenna device, which comprises a bottom shell and a face shell, and a cavity is formed by the combination of the two shells; a circuit board and a circularly polarized antenna unit are arranged in the cavity; an MCU unit is arranged on the circuit board and is electrically connected to an RF control unit, a communication unit, a power conversion unit and an interface unit; an RF_SOC chip, an automatic tuning oscillation unit and the circularly polarized antenna unit are sequentially electrically connected; the RF_SOC chip is electrically connected to the RF control unit; a read-write area is arranged on the face shell at a position corresponding to the circularly polarized antenna unit; a lamp hole is arranged on one side of the read-write area; an indicating lamp electrically connected to the MCU unit is arranged on the circuit board; the indicating lamp is arranged relative to the lamp hole; and the lamp hole is provided with a lens.

3. A low power high frequency workbench reader writer according to claim 1 or 2, characterized in that, ​ ​ 4. A low power high frequency workbench reader writer according to claim 3, wherein, ​ 5. The low power high frequency workbench reader of claim 1, wherein, ​ ​ ​ ​ 6. A low power high frequency workbench reader writer according to claim 5, wherein, ​ ​ ​ 7. A low power high frequency workbench reader writer according to claim 6, wherein, ​ ​ 8. The low power high frequency workbench reader of claim 1, wherein, ​ ​ ​ ​ ​ ​ The end of the signal receiving positive channel and the second signal transmitting channel is electrically connected with the second end of the circularly polarized antenna unit; The middle position of the circularly polarized antenna unit is provided with a third end of the ground connection through a filtering resistor.

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