TWI408908B - Antenna switch and antenna switching method thereof - Google Patents

Abstract

PURPOSE: An antenna switch and an antenna switching method thereof are provided to attenuate the electric wave of an RFID(Radio Frequency IDentification) readers by providing impedance matching through first and second impedance matching circuits. CONSTITUTION: An RFID system(2) includes an RFID reader(12), an RFID tag, an antenna switch(20) and antennas(14a-14p). The antenna switch electrically connects the RFID reader to one of the antennas. The antennas are arranged on a shelf(16), and the RFID reader reads out the data of the RFID tag through the antennas. The RFID readers immediately obtains the state change of the articles on the shelf, and the RFID system is electrically connected to at least 4 sets among the antennas through the antenna switch.

Description

Antenna switcher and antenna switching method thereof

The present invention relates to an antenna switcher and an antenna switching method thereof, and more particularly to an antenna switcher for radio frequency identification (RFID) technology and an antenna switching method thereof.

Please refer to FIG. 1 , which is a schematic diagram of a conventional radio frequency identification system. The Radio Frequency Identification (RFID) system 1 includes a radio frequency identification reader 12 (RFID Reader), a radio frequency identification tag (not shown), and an antenna 14. Radio Frequency Identification (RFID) system 1 uses radio frequency transmission to identify, classify, locate, and track objects. The radio frequency identification system 1 includes a radio frequency identification reader 12 (RFID Reader), a radio frequency identification tag (not shown), and an antenna 14. The RFID tag is attached to the object to be tracked and can be programmed to broadcast a specific data stream representing the identity of the object, such as serial number and model number, price, inventory code, and date.

The antenna 14 is disposed on the shelf 16 such that the RFID reader 12 reads the data of the RFID tag via the antenna 14 to quickly learn the changes in the items on the shelf. The RFID system 1 can be further connected to a network system that sends information about the item to interested parties, such as retailers and product manufacturers. A radio frequency identification tag is considered a smart bar code that can communicate with a network system to track each object associated with a given tag. Therefore, RFID tags are widely used in the wholesale, distribution and retail industries.

When the existing RFID reader 12 is equipped with the antenna 14, one radio frequency identification reader 12 can only be configured with four antennas 14. Therefore, when more than four sets of antennas 14 need to be used in an actual environment, another radio frequency identification reader 12 must be added to match. However, the price of the radio frequency identification reader 12 is still high at this stage, so if the number of the radio frequency identification readers 12 increases, the cost will increase. Therefore, how to reduce the number of uses of the RFID reader 12 has become an important issue that needs to be solved urgently.

The invention relates to an antenna switcher and an antenna switching method thereof.

According to an aspect of the invention, an antenna switcher is proposed. The antenna switch includes a switching unit, a manual switching key, a sensor input/output interface, and a micro control unit. The switching unit is configured to electrically connect a Radio Frequency Identification (RFID) reader to one of the plurality of antennas. The sensor input and output interface is connected to the sensor, and the sensor senses a change in the state of the item on the antenna to output a sensing signal. The micro control unit generates a sensing switching command according to the sensing signal, and determines whether the manual switching key is triggered and whether the wireless RFID reader reads the data, if the manual switching key is not triggered and the wireless identification reader is not In reading the data, the micro control unit controls the switching unit according to the sensing switching command.

According to another aspect of the present invention, an antenna switching method for an antenna switcher is provided. The antenna switching method of the antenna switch is used to electrically connect a Radio Frequency Identification (RFID) reader to one of the plurality of antennas. The antenna switching method includes: sensing a change of an item state on the antenna to generate a sensing switching command; determining whether the wireless RFID reader is reading the data; if the wireless RFID reader is reading the data, waiting Temporarily storing the sensing switching command; if the wireless RFID reader does not read the data, determining whether the manual switching key of the antenna switch is triggered; and if the manual switching key is not triggered, the antenna is controlled according to the sensing switching command The connection to the RFID reader.

In order to make the above-mentioned contents of the present invention more comprehensible, a preferred embodiment will be described below, and in conjunction with the drawings, a detailed description is as follows:

In order to reduce the number of uses of the radio frequency identification reader, the following embodiments disclose an antenna switch and an antenna switching method thereof. The antenna switch includes a switching unit, a manual switching key, a sensor input/output interface, and a micro control unit. The switching unit is configured to electrically connect a Radio Frequency Identification (RFID) reader to one of the plurality of antennas. The sensor input and output interface is connected to the sensor, and the sensor senses a change in the state of the item on the antenna to output a sensing signal. The micro control unit generates a sensing switching command according to the sensing signal, and determines whether the manual switching key is triggered and whether the wireless RFID reader reads the data, if the manual switching key is not triggered and the wireless identification reader is not In reading the data, the micro control unit controls the switching unit according to the sensing switching command.

The antenna switching method includes: sensing a change of an item state on the antenna to generate a sensing switching command; determining whether the wireless RFID reader is reading the data; if the wireless RFID reader is reading the data, waiting Temporarily storing the sensing switching command; if the wireless RFID reader does not read the data, determining whether the manual switching key of the antenna switch is triggered; and if the manual switching key is not triggered, the antenna is controlled according to the sensing switching command The connection to the RFID reader.

First embodiment

Please refer to FIG. 2, which is a schematic diagram of a radio frequency identification system according to a first embodiment of the present invention. The Radio Frequency Identification (RFID) system 2 includes a radio frequency identification reader 12 (RFID Reader), a radio frequency identification tag (not shown), an antenna switch 20, and antennas 14a to 14p. The antenna switch 20 is used to electrically connect the RFID reader 12 to one of the antennas 14a to 14p. The antennas 14a to 14p are disposed on the shelf 16 such that the RFID reader 12 reads the data of the RFID tag via the antennas 14a to 14p to quickly learn the changes in the items on the shelf. It should be noted that the radio frequency identification system 2 is electrically connected to more than four sets of antennas 14 via the antenna switch 20, so that the number of radio frequency identification readers 12 can be used and the cost can be greatly reduced.

Please refer to FIG. 3, which is a schematic diagram of an antenna switch according to a first embodiment of the present invention. The antenna switch 20 includes a switching unit 212, a manual switching key 214, a sensor input/output (I/O) interface 216, a micro control unit 218 (Micro Control Unit, MCU), an external input/output (I/O) interface 226, The radio frequency identification reader is connected to the port 228, the antenna ports 230a to 230p, the first impedance unit 232a, the second impedance unit 232b, the battery 238, the charger 240, the power supply unit 242, and the display unit 244. The manual switch button 214 is used for the user to manually set the number and set time of the antenna port to be switched. The switching unit 212 is configured to electrically connect the RFID reader 12 to one of the antennas 14a to 14p. The display unit 244 is configured to display the number and set time of the set antenna connection port.

The external input/output interface 226 is used to connect to the external device 50, such as a computer. The external device 50 can control the switching unit 212 via the external input/output interface 226 and the micro control unit 218 and set the next antenna to be switched. The sensor input and output interface 216 is connected to the sensor 40, and the sensor 40 is used to sense the state change of the articles on the antennas 14a to 14P to output the sensing signal S1. The micro control unit 218 generates a sensing switching command according to the sensing signal S1, and controls the switching unit 212 according to the sensing switching command when the manual switching key 214 is not triggered.

A radio frequency identification reader port 228 is used to connect to the radio frequency identification reader 12, and antenna ports 230a to 230p are used to connect the antennas 14a to 14p. The first impedance unit 232a is connected to the RFID reader port 228 and the switching unit 212, and the second impedance unit 232b is connected to the antenna ports 230a to 230p and the switching unit 212. The first impedance unit 232a includes a first surge protection circuit 234a and a first impedance matching circuit 236a, and the second impedance unit 232b includes a second surge protection circuit 236b and a second impedance matching circuit 234b. The first surge protection circuit 234a is connected to the radio frequency identification reader port 228 and the first impedance matching circuit 236a, and the first impedance matching circuit 236a is connected to the switching unit 212. The second surge protection circuit 236b is connected to the antenna ports 230a to 230p and the second impedance matching circuit 243b, and the second impedance matching circuit 234b is connected to the switching unit 212. The first impedance matching circuit 236a and the second impedance matching circuit 234b are used for impedance matching to prevent the radio wave signal of the radio frequency identification reader 12 from excessively degrading the radio wave intensity after the antenna switch 20 to affect the reading rate. The first surge protection circuit 234a and the second surge protection circuit 236b are used to avoid circuit damage caused by the rebound of the electric wave.

The charger 240 is used to charge the battery 238. When the battery 238 is supplied to the antenna switch 20 without an external power source, the operating power required by the antenna switch 20 is supplied. The power supply unit 242 is connected to the charger 240 and provides the operational power required by the antenna switch 20 in accordance with an external power source.

The antenna switch 20 described above is capable of selectively operating one of an external switching mode, an automatic switching mode, a manual switching mode, and a sensing switching mode. The external switching mode sets the number of the antenna port to be switched by the external device 50, and the automatic switching mode automatically switches the connection between the antenna ports 230a to 230p and the RFID reader 12 in sequence by the antenna switch 20. .

Manual switching mode

Please refer to FIG. 3 and FIG. 4 at the same time. FIG. 4 is a flow chart showing an antenna switching method in which the antenna switcher operates in the manual switching mode. First, as shown in step 412, processing unit 220 detects manual switch key 214. Next, as shown in step 414, the processing unit 220 determines whether the manual switch key 214 is triggered. If the manual switch key 214 is not triggered, step 412 is repeated. If the manual switch key 214 is triggered, step 416 is performed, and the processing order is processed. The element 220 generates a corresponding manual switching command according to the setting of the manual switching key 214. In step 416, the processing unit 220 determines whether the radio frequency identification reader 12 reads the data. If the RFID reader 12 is not reading the data, step 418 is performed. In step 418, the processing unit 220 controls the switching unit 212 to perform a connection between the switching antenna ports 230a to 230p and the radio frequency identification reader port 228 according to the manual switching command.

Conversely, if the RFID reader 12 reads the data, step 420 is performed. In step 420, the processing unit 220 waits for the radio frequency identification reader 12 to read the current data and temporarily store the manual switching command to the storage unit 222. Then, as shown in step 422, the processing unit 220 determines whether the radio frequency identification reader 12 is still reading data. If the RFID reader 12 still reads the data, step 420 is repeated until the RFID reader 12 reads the data. After the radio frequency identification reader 12 reads the data, step 424 is executed, and the processing unit 220 reads the manual switching command previously stored in the storage unit 222. Then, as shown in step 418, the processing unit 220 controls the switching unit 212 to perform a connection between the switching antenna ports 230a to 230p and the radio frequency identification reader port 228 according to the manual switching command.

Sensing switching mode

Please refer to FIG. 3 and FIG. 5 simultaneously. FIG. 5 is a flow chart showing an antenna switching method in which the antenna switch operates in the sensing switching mode. First, as shown in step 512, sensor 40 senses changes in the state of the items on antennas 14a through 14p. Before the state of the items on the antennas 14a to 14p changes, the antenna switch 20 can operate in an automatic switching mode and automatically switch between the antenna ports 230a to 230p and the RFID reader 12 in sequence according to a reading order. Connection. For example, the reading order is sequentially the antenna port 230a, the antenna port 230b, the antenna port 230c, and the antenna ports 230d to 230p. When the state of the article on the antennas 14a to 14p changes, the sensor 40 outputs the sensing signal S1. The sensing signal S1 is input to the micro control unit 218 via the sensor input/output interface 216, and the processing unit 220 outputs a sensing switching command according to the sensing signal S1.

Next, as shown in step 514, the processing unit 220 determines whether the state of the item on the antennas 14a to 14p has changed based on the sensing signal S1. If the state of the item on the antennas 14a to 14p has not changed, step 512 is repeated. If the state of the item on the antennas 14a to 14p changes, as shown in step 516, the processing unit 220 determines whether the radio frequency identification reader 12 is still reading the data. If the RFID reader 12 is not reading the data, step 518 is performed. In step 518, the processing unit 220 controls the switching unit 212 to perform a connection between the switching antenna ports 230a to 230p and the radio frequency identification reader port 228 according to the sensing switching command. Following the step 526, the processing unit 220 controls the switching unit 212 to perform the connection between the switching antenna ports 230a to 230p and the RFID reader port 228 in accordance with the reading order before the change in the state of the article.

Conversely, if the RFID reader 12 reads the data, step 520 is performed. In step 520, the processing unit 220 waits for the radio frequency identification reader 12 to read the current data and temporarily store the sensing switching command to the storage unit 222. Then, as shown in step 522, the processing unit 220 determines whether the radio frequency identification reader 12 is still reading the data. If the RFID reader 12 still reads the data, step 520 is repeated until the RFID reader 12 reads the data. After the radio frequency identification reader 12 reads the data, step 524 is executed, and the processing unit 220 reads the sensing switching command previously stored in the storage unit 222. Then, as shown in step 518, the processing unit 220 controls the switching unit 212 to perform a connection between the switching antenna ports 230a to 230p and the radio frequency identification reader port 228 according to the sensing switching command. Following the step 526, the processing unit 220 controls the switching unit 212 to perform the connection between the switching antenna ports 230a to 230p and the RFID reader port 228 in accordance with the reading order before the change in the state of the article.

For example, if the state of the items on the antennas 14a to 14p does not change, the antenna switch 20 should operate in the automatic switching mode and the antenna port 230a to the antenna port 230p are sequentially switched in accordance with the reading order. That is, if the state of the article on the antennas 14a to 14p does not change, the antenna port 230a is switched to the antenna port 230b, and then switched to the antenna port 230c by the antenna port 230b. However, if the state of the article on the antenna 14e changes, the antenna port 230a is switched to the antenna port 230b, and is switched to the antenna port 230e by the antenna port 230b.

In order to ensure the integrity of the data reading, during the switching process of the antenna port, the radio frequency identification reader 12 must wait for the data to be read through the previous antenna connection before switching to the next antenna port. That is, the processing unit 220 needs to temporarily store the sensing switching command, and wait for the RFID reader 12 to read the data via the antenna port 230b to read the previously stored sensing switching command and according to the sensing. The switching command switches the antenna port 230b to the antenna port 230e.

After the RFID reader 12 reads the data via the antenna port 230e, the processing unit 220 switches the antenna port 230e to the antenna port 230c according to the reading order before the item state changes.

Sensing switching with manual switching mode

Please refer to FIG. 3 and FIG. 6 at the same time. FIG. 6 is a flow chart showing an antenna switching method in which the antenna switch operates in the sensing switching with the manual switching mode. First, as shown in step 612, sensor 40 senses changes in the state of the items on antennas 14a through 14p. Before the state of the items on the antennas 14a to 14p changes, the antenna switch 20 can operate in an automatic switching mode and automatically switch between the antenna ports 230a to 230p and the RFID reader 12 in sequence according to a reading order. Connection. For example, the reading order is sequentially the antenna port 230a, the antenna port 230b, the antenna port 230c, and the antenna ports 230d to 230p. When the state of the article on the antennas 14a to 14p changes, the sensor 40 outputs the sensing signal S1. The sensing signal S1 is input to the micro control unit 218 via the sensor input/output interface 216, and the processing unit 220 outputs a sensing switching command according to the sensing signal S1.

Next, as shown in step 614, the processing unit 220 determines whether the state of the item on the antennas 14a to 14p has changed based on the sensing signal S1. If the state of the item on the antennas 14a to 14p has not changed, step 612 is repeatedly executed. If the state of the item on the antennas 14a to 14p changes, as shown in step 616, the processing unit 220 determines whether the radio frequency identification reader 12 is still reading the data. If the RFID reader 12 reads the data, step 624 is performed. In step 624, the processing unit 220 waits for the radio frequency identification reader 12 to read the current data and temporarily store the sensing switching command to the storage unit 222. If the RFID reader 12 is not reading the data, step 618 is performed. In step 618, the processing unit 220 determines whether the manual switch key 214 is triggered. If the manual switch key 214 is triggered, then step 624 is performed. Conversely, if the manual switch key 214 is not triggered, then step 620 is performed. In step 620, the processing unit 220 controls the switching unit 212 to perform a connection between the switching antenna ports 230a to 230p and the radio frequency identification reader port 228 according to the sensing switching command. Next, as shown in step 622, the processing unit 220 controls the switching unit 212 to perform the connection between the switching antenna ports 230a to 230p and the radio frequency identification reader port 228 according to the reading order before the change of the item state.

After the foregoing step 624 is performed, step 626 is performed. In step 626, the processing unit 220 determines whether the radio frequency identification reader 12 is still reading data. If the RFID reader 12 reads the data, step 624 is performed. If the RFID reader 12 is not reading the data, step 628 is performed. In step 628, the processing unit 220 determines whether the manual switch key 214 is triggered. If the manual switch key 214 is triggered, then step 624 is performed. Conversely, if the manual switch key 214 is not triggered, then step 620 is performed. In step 620, the processing unit 220 controls the switching unit 212 to perform a connection between the switching antenna ports 230a to 230p and the radio frequency identification reader port 228 according to the sensing switching command. Next, as shown in step 622, the processing unit 220 controls the switching unit 212 to perform the connection between the switching antenna ports 230a to 230p and the radio frequency identification reader port 228 according to the reading order before the change of the item state. For example, if the state of the item on the antennas 14a to 14p does not change or the manual switching key 214 is not triggered, the antenna switch 20 should operate in the automatic switching mode and the antenna port 230a to the antenna port 230p are in accordance with the reading order. Order switching. That is, if the state of the item on the antennas 14a to 14p does not change or the manual switching key 214 is not triggered, after the antenna port 230a is switched to the antenna port 230b, the antenna port 230b should be switched to the antenna port 230c. . However, if the state of the article on the antenna 14e changes or the manual switch key 214 is set to switch to the antenna 14e, the antenna port 230a is switched to the antenna port 230b, and then switched to the antenna port 230e by the antenna port 230b.

In order to ensure the integrity of the data reading, during the switching process of the antenna port, the radio frequency identification reader 12 must wait for the data to be read through the previous antenna connection to further determine whether to switch to the next antenna port. After the radio frequency identification reader 12 reads the data through the previous antenna connection, it is further determined whether the manual switching key 214 is triggered. When the RFID reader 12 reads the data via the previous antenna connection and the manual switch key 214 is not triggered, the antenna port can be switched. That is, when the RFID reader 12 is triggered by the previous antenna connection or the manual switch key 214 is triggered, the processing unit 220 needs to temporarily store the sensing switching command and wait for the radio frequency identification reading. The device 12 reads the data through the antenna port 230b to read the previously stored sensing switching command and switches the antenna port 230b to the antenna port 230e according to the sensing switching command.

After the radio frequency identification reader 12 reads the data via the antenna port 230e and the manual switch key 214 is not triggered, the processing unit 220 switches the antenna port 230e to the antenna connection according to the reading order before the item state changes.埠 230c.

Second embodiment

Please refer to FIG. 7. FIG. 7 is a schematic diagram showing an antenna switch according to a second embodiment of the present invention. The antenna switcher 70 differs from the antenna switcher 20 in that the antenna switcher 70 further includes an analog-to-digital converter 710. When the sensing signal S1 output by the sensor 40 is a digital signal, the sensing signal S1 is input to the micro control unit 218 via the sensor input and output interface as described in the first embodiment. Conversely, when the sensing signal S1 output by the sensor 40 is an analog signal, the sensing signal S1 needs to be converted into a digital signal via the analog digital converter 710 and then input to the micro control unit 218. The micro control unit 218 generates a sensing switching command based on the digital signal.

The antenna switch and the antenna switching method thereof disclosed in the above embodiments of the present invention can reduce the number of uses of the radio frequency identification reader and greatly reduce the cost.

In view of the above, the present invention has been disclosed in a preferred embodiment, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

1. . . Radio frequency identification system

2. . . Radio frequency identification system according to an embodiment of the invention

12. . . Radio frequency identification reader

14, 14a ~ 14p. . . antenna

16. . . Shelf

20. . . Antenna switcher

40. . . Sensor

50. . . External device

212. . . Switching unit

214. . . Manual switch

216. . . Sensor input and output interface

218. . . Micro control unit

220. . . Processing unit

222. . . Storage unit

226. . . External input and output interface

228. . . Wireless RFID reader connection埠

230a～230p. . . Antenna connection埠

232a. . . First impedance unit

232b. . . Second impedance unit

234a. . . First surge protection circuit

234b. . . Second impedance matching circuit

236a. . . First impedance matching circuit

236b. . . Second surge protection circuit

238. . . battery

240. . . charger

242. . . Power supply unit

244. . . Display unit

412, 414, 416, 418, 420, 422, 424, 512, 514, 516, 518, 520, 522, 524, 612, 614, 616, 618, 620, 622, 624, 626, 628, 630. . . step

710. . . Analog digital converter

S1. . . Sense signal

Figure 1 is a schematic diagram showing a conventional radio frequency identification system.

2 is a schematic diagram showing a radio frequency identification system according to a first embodiment of the present invention.

Figure 3 is a schematic diagram showing an antenna switcher in accordance with a first embodiment of the present invention.

FIG. 4 is a flow chart showing an antenna switching method in which the antenna switch operates in the manual switching mode.

FIG. 5 is a flow chart showing an antenna switching method in which the antenna switch operates in the sensing switching mode.

FIG. 6 is a flow chart showing an antenna switching method in which the antenna switch operates in the sensing switching with the manual switching mode.

Figure 7 is a schematic diagram showing an antenna switcher in accordance with a second embodiment of the present invention.

2‧‧‧ Radio Frequency Identification System According to an Embodiment of the Present Invention

14a~14p‧‧‧Antenna

16‧‧‧ Shelf

20‧‧‧Antenna Switcher

Claims (14)

An antenna switch includes: a switching unit for electrically connecting a Radio Frequency Identification (RFID) reader to one of a plurality of antennas; a manual switching button; a sensor input and output The interface is connected to a plurality of sensors for sensing changes in the state of the items on the antennas to output a sensing signal; and a micro control unit for generating a sense based on the sensing signals Measuring a switching command, and determining whether the manual switching key is triggered and whether the wireless identification reader reads data, if the manual switching key is not triggered and the wireless identification reader is not reading data, The micro control unit controls the switching unit according to the sensing switching command. The antenna switch of claim 1, wherein the micro control unit comprises: a storage unit; and a processing unit configured to generate the sensing switching command according to the sensing signal, and switch according to the sensing The switching unit is commanded to temporarily store the sensing switching command to the storage unit when the RFID reader reads the data. The antenna switch of claim 2, wherein, after the sensing switching command is temporarily stored in the storage unit, the processing unit determines whether the manual switching key is triggered and whether the wireless identification reader reads In the data collection, if the manual switching key is not triggered and the wireless RFID reader is not reading data, the processing unit executes the sensing switching command temporarily stored by the storage unit. The antenna switch of claim 1, further comprising: an analog-to-digital converter for converting the sensing switching signal into a digital signal output to the micro control unit. The antenna switch of claim 1, further comprising: an external input/output interface for connecting to an external device, wherein the external device controls the switching unit via the external input/output interface and the micro control unit. The antenna switch according to claim 1, further comprising: a radio frequency identification reader port; a plurality of antenna ports; and a first impedance unit connected to the radio frequency identification reader port; And the switching unit; a second impedance unit connecting the antenna ports and the switching unit. The antenna switch of claim 6, wherein the first impedance unit comprises a first surge protection circuit and a first impedance matching circuit, and the second impedance unit comprises a second surge protection circuit and a second impedance matching circuit, the first surge protection circuit is connected to the RFID reader connection and the first impedance matching circuit, the first impedance matching circuit is connected to the switching unit, and the second surge protection circuit is The antenna connection port and the second impedance matching circuit are connected, and the second impedance matching circuit is connected to the switching unit. The antenna switch of claim 1, further comprising: a battery; a charger for charging the battery; and a power supply unit connected to the charger and provided according to an external power source A working power supply. An antenna switching method for an antenna switch is used for electrically connecting a radio frequency identification (RFID) reader to one of a plurality of antennas. The antenna switching method includes: sensing the antennas Changing the state of the item to generate a sensing switching command; determining whether the RFID reader is reading data; if the RFID reader reads the data, waiting for the data to be read and temporarily storing the feeling Measuring a switching command; if the radio frequency identification reader is not reading data, determining whether a manual switching key of the antenna switcher is triggered; and if the manual switching key is not triggered, switching according to the sensing switching command . The antenna switching method of claim 9, wherein the step of sensing an item state change on the antennas to generate a sensing switching command further comprises: sensing an item state change on the antennas to Outputting a sensing signal; and generating the sensing switching command according to the sensing signal. The antenna switching method of claim 9, wherein the step of sensing an item state change on the antennas to generate a sensing switching command further comprises: sensing an item state change on the antennas to Outputting a sensing signal; converting the sensing signal into a digital signal; and generating the sensing switching command according to the digital signal. The antenna switching method according to claim 9, further comprising: switching according to a reading order before the state of the items on the antennas changes. The antenna switching method according to claim 9, wherein if the manual switching key is triggered, the sensing switching command is waited for and temporarily stored. The antenna switching method of claim 13, further comprising: determining whether the radio frequency identification reader is reading data; if the radio frequency identification reader is reading data, waiting and temporarily And storing the sensing switching command; if the wireless RFID reader is not reading the data, determining whether the manual switching key of the antenna switch is triggered; and reading the sensing switching command to switch according to the sensing The antennas are switched to be electrically connected to the RFID reader.