CN215006687U - RFID sensing system - Google Patents
RFID sensing system Download PDFInfo
- Publication number
- CN215006687U CN215006687U CN202121327962.XU CN202121327962U CN215006687U CN 215006687 U CN215006687 U CN 215006687U CN 202121327962 U CN202121327962 U CN 202121327962U CN 215006687 U CN215006687 U CN 215006687U
- Authority
- CN
- China
- Prior art keywords
- wireless signal
- tag
- rfid reader
- antenna
- writer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model discloses a RFID sensing system, a receiving and transmitting antenna is connected with an RFID reader-writer by wire, and the receiving and transmitting antenna, a sensing part and a passive tag are arranged in a shielding case; the shielding cover is used for placing the target to be detected; the RFID reader-writer is used for transmitting a first wireless signal through the transceiving antenna when the target to be detected is placed in the shielding case; the passive tag is used for receiving the first wireless signal, acquiring energy from the first wireless signal and sending a second wireless signal based on the first wireless signal; the sensing component is used for adjusting a wireless channel between a receiving and transmitting antenna and a tag in the shielding case when the state of the object to be detected is monitored to change, so that the characteristics of the second wireless signal are adjusted, and a third wireless signal is obtained; and the RFID reader-writer is also used for receiving a third wireless signal through the transceiving antenna. The utility model discloses a RFID sensing system can improve the reliability of testing result.
Description
Technical Field
The utility model relates to a sensor technology application, in particular to RFID sensing system.
Background
The radio Frequency identification (rfid) technology is a technology for performing contactless information communication between a reader/writer and a tag by using radio Frequency radio signals. The RFID reader-writer (Interrogator) can identify and track the target to be detected through a Tag (Tag), and can read and write data of a Tag chip on the target to be detected.
At present, an RFID sensing system mainly includes a reader/writer, a tag, and a computer processing terminal, where the tag sends stored sensing data to the reader/writer by using a back modulator technique (backscattering modulation), and the reader/writer returns data based on the tag to obtain detection information: the physical quantity to be detected is changed or not; and the computer processing end is used for displaying the obtained detection result.
However, when the existing RFID sensing system is used to detect a target to be detected, the problem of an excessively high false alarm rate due to electromagnetic interference is easily caused.
Disclosure of Invention
The utility model aims at providing a detecting system aims at solving and utilizes current RFID sensing system to treat the detection objective and examine time measuring, the too high problem of false alarm rate that exists.
In order to achieve the above object, the present invention provides an RFID sensing system, which includes an RFID reader/writer, a transmitting/receiving antenna, a passive tag, a sensing part, and a shield cover; wherein,
the receiving and transmitting antenna is in wired connection with the RFID reader-writer, and the receiving and transmitting antenna, the sensing component and the passive tag are arranged in the shielding case;
the shielding cover is used for shielding external electromagnetic interference and placing a target to be detected;
the RFID reader-writer is used for transmitting a first wireless signal through the transceiving antenna when the target to be detected is placed in the shielding case;
the passive tag is used for receiving the first wireless signal, acquiring energy from the first wireless signal and sending a second wireless signal based on the first wireless signal;
the sensing component is used for adjusting a wireless channel between the transceiving antenna and the passive tag in the shielding case when the state of the object to be detected is monitored to change, so as to adjust the characteristics of the second wireless signal and obtain a third wireless signal;
the RFID reader-writer is also used for receiving the third wireless signal through the transceiving antenna.
Optionally, the system further includes a terminal device, and the terminal device is in communication connection with the RFID reader;
the terminal equipment is used for receiving a control instruction sent by a user when the target to be detected is placed in the shielding case, and acquiring an issuing instruction based on the control instruction;
the RFID reader-writer is further used for generating the first wireless signal when receiving the issuing instruction and transmitting the first wireless signal through the transceiving antenna.
Alternatively to this, the first and second parts may,
the RFID reader-writer is also used for extracting wireless signal characteristic information from the third wireless signal;
the terminal device is also used for receiving the wireless signal characteristic information sent by the RFID reader-writer and analyzing and processing the wireless signal characteristic information.
Alternatively to this, the first and second parts may,
the RFID reader-writer is further configured to output alarm information when the characteristic information of the wireless signal is not matched with the characteristic information of the historical wireless signal, wherein the historical wireless signal characteristic information is extracted from a third wireless signal received by the RFID reader-writer at a historical time.
Alternatively to this, the first and second parts may,
the sensing part is arranged between the transceiving antenna and the passive tag, a gap is formed between the sensing part and the transceiving antenna, a gap is formed between the sensing part and the passive tag, and the target to be detected surrounds the sensing part.
Optionally, the passive tag has a tag antenna, and the tag antenna is made of a conductive metal material;
the passive tag is used for receiving the first wireless signal by using the tag antenna; and adjusting the impedance of the tag antenna by using pre-stored data so as to send the second wireless signal through the tag antenna after impedance adjustment.
Optionally, the terminal device is connected with the RFID reader in a wireless communication manner.
Optionally, the radio signal characteristic information includes an amplitude, a phase, and a doppler frequency of the third radio signal.
Optionally, the sensing component is made of a humidity-sensitive material, a temperature-sensitive material or a gas-sensitive material.
Optionally, the passive tag is a dry tag or a wet tag.
The technical scheme of the utility model provides a detection system of RFID sensing, the system includes RFID read write line, receiving and dispatching antenna, passive label, sensing element and shield cover; the receiving and transmitting antenna is in wired connection with the RFID reader-writer, and the receiving and transmitting antenna, the sensing component and the passive tag are arranged in the shielding case; the shielding cover is used for shielding external electromagnetic interference and placing a target to be detected; the RFID reader-writer is used for transmitting a first wireless signal through the transceiving antenna when the target to be detected is placed in the shielding case; the passive tag is used for receiving the first wireless signal, acquiring energy from the first wireless signal and sending a second wireless signal based on the first wireless signal; the sensing component is used for adjusting a wireless channel between the transceiving antenna and the passive tag in the shielding case when the state of the object to be detected is monitored to change, so as to adjust the characteristics of the second wireless signal and obtain a third wireless signal; the RFID reader-writer is also used for receiving the third wireless signal through the transceiving antenna.
In the existing passive sensing scheme, when a passive tag transmits a wireless signal, the signal is interfered by external electromagnetic waves, so that the detection false alarm rate is too high. And the system, all set up receiving and dispatching antenna, label and sensing part in the shield cover that has electromagnetic shield function, the third radio signal that receiving and dispatching antenna received can not receive external electromagnetic wave's interference to sensing system's false alarm rate has been reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a block diagram of a first embodiment of the sensing system of the present invention;
fig. 2 is a schematic structural diagram of the passive tag of the present invention;
fig. 3 is a block diagram of a second embodiment of the sensing system of the present invention;
fig. 4 is a schematic diagram of a first embodiment of the physical structure of the sensing system of the present invention;
fig. 5 is a partial schematic view of a second embodiment of the physical structure of the sensing system of the present invention;
fig. 6 is a schematic structural diagram of the sensing component of the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a block diagram of a first embodiment of the RFID sensing system of the present invention, where the system includes an RFID reader/writer 11, a transceiver antenna 13, a passive tag 15, a sensing component 14, and a shielding case 12; wherein,
the transceiving antenna 13 is in wired connection with the RFID reader-writer 11, and the transceiving antenna 13, the sensing component 14 and the passive tag 15 are arranged in the shielding case 12;
the shielding case 12 is used for shielding external electromagnetic interference and placing a target to be detected;
the RFID reader 11 is configured to transmit a first wireless signal through the transceiver antenna 13 when the target to be detected is placed in the shielding case 12;
the passive tag 15 is configured to receive the first wireless signal, obtain energy from the first wireless signal, and send a second wireless signal based on the first wireless signal;
the sensing component 14 is configured to, when it is monitored that the state of the object to be detected changes, adjust a wireless channel between the transceiver antenna 13 and the passive tag 15 in the shielding case 12, so as to adjust the characteristic of the second wireless signal, and obtain a third wireless signal;
the RFID reader 11 is further configured to receive the third wireless signal through the transceiver antenna 13.
It should be noted that, in the present invention, the shielding cover is used for shielding external electromagnetic interference, and it is not a closed shielding cover, and may be in the form of a shielding net; the parameters of gas composition, temperature and humidity in the shielding case are the same as the outside.
The object to be detected may be a physical object, such as a liquid, the sensing system being adapted to detect a change in the level of the liquid; the object to be detected may also be some physical quantity, such as temperature, humidity and gas composition inside the shielding enclosure, for example, a sensing system for detecting if the temperature inside the shielding enclosure has changed significantly.
Further, the passive tag 15 is further configured to send the second wireless signal based on the first wireless signal and pre-stored data.
Specifically, the passive tag 15 has a tag antenna;
the passive tag 15 is configured to receive the first wireless signal by using the tag antenna; and adjusting the impedance of the tag antenna by using the stored data so as to transmit the second wireless signal through the tag antenna after impedance adjustment.
It can be understood that the passive tag receives the first wireless signal, and because the impedance of the tag antenna changes, when the first wireless signal is reflected by the passive tag antenna after the impedance is adjusted and then transmitted, the first wireless signal changes, and the changed first wireless signal is the second wireless signal. The impedance of the passive tag antenna is adjusted to realize reflection modulation of the first wireless signal, and a second wireless signal is obtained.
Referring to fig. 2, fig. 2 is a schematic structural diagram of the passive tag of the present invention, the passive tag includes a tag antenna and a chip, and the chip may be an RFID chip. Generally, a tag stores ID data and transmits the ID data to an RFID reader in communication with a reader. Wherein the ID data is stored in the chip.
In the present invention, the sensing member is made of a sensing electromagnetic material, such as a temperature sensitive material, a humidity sensitive material, or a gas sensitive material.
The RFID reader-writer transmits a first wireless signal through the transceiving antenna so as to communicate with the passive tag; after the passive tag sends the second wireless signal, when the state of the target to be detected changes, the conductivity or magnetic conductivity of the sensing component changes, so that a wireless channel in the shielding case changes, and the second wireless signal is transmitted through the wireless channel to obtain a third wireless signal; and the RFID reader-writer receives the third wireless signal.
The targets to be detected are different, the materials adopted by the sensing parts are different, and when the targets to be detected are liquid levels, the sensing parts are not needed, namely, the liquid can be used as the sensing materials; for example, when a liquid is placed in a container and the container is placed in a shielded enclosure, the change in the liquid level changes the wireless channel, causing a change in the characteristics of the wireless signal transmitted in the channel.
When the target to be detected is a physical quantity, a corresponding sensing component needs to be arranged, and the specific material of the sensing component corresponds to the target to be detected. For example, the physical quantity to be detected is a gas component, and the sensing component is a gas-sensitive material; the physical quantity to be detected is temperature, and the sensing part is a temperature-sensitive material; the physical quantity to be detected is humidity, and the sensing part is a humidity sensitive material.
Specifically, the tag antenna of the passive tag is printed from a conductive metal material, for example, a conductive metal such as aluminum, copper, or an alloy. The back of the passive label can be pasted with adhesive sticker (wet label) so as to be convenient for placing the label. According to different application scenes, the passive tag can be packaged by a non-conductive material to be made into a dry tag.
The chip of the passive tag stores ID and other information of the tag, and the RFID reader-writer equipment supporting multi-tag reading and writing can respectively determine whether the property of the target to be detected at the position of each tag changes according to the ID information returned by different tags.
Further, the sensing component 14 is disposed between the transceiving antenna 13 and the passive tag 15, a gap is formed between the sensing component 14 and the transceiving antenna 13, a gap is formed between the sensing component 14 and the passive tag 15, and the target to be detected is disposed to surround the sensing component 14. The detection target surrounds the sensing part, and when the target to be detected changes, the sensing part can accurately and quickly monitor the change.
In this embodiment, the sensing part is disposed between the transmitting and receiving antenna and the tag, and can change the characteristic of the second wireless signal when the state of the object to be detected changes. That is, the third wireless signal received by the RFID reader/writer carries the change information of the sensed object, compared with the second wireless signal.
Further, referring to fig. 3, fig. 3 is a block diagram of a structure of a second embodiment of the RFID sensing system of the present invention, the system further includes a terminal device 16, and the terminal device 16 is in communication connection with the RFID reader/writer 11;
the terminal device 16 is configured to receive a control instruction sent by a user when the target to be detected is placed in the shielding case 12, and obtain an issuing instruction based on the control instruction;
the RFID reader 11 is further configured to generate the first wireless signal when receiving the issuing instruction, and transmit the first wireless signal through the transceiving antenna 13.
The terminal device may be a User Equipment (UE) such as a Mobile phone, a smart phone, a laptop, a digital broadcast receiver, a Personal Digital Assistant (PDA), a tablet computer (PAD), a handheld device, a vehicle mounted device, a wearable device, a computing device or other processing device connected to a wireless modem, a Mobile Station (MS), etc. The terminal device may be referred to as a user terminal, a portable terminal, a desktop terminal, etc.
In this embodiment, the terminal device is configured to implement control over the sensing system, that is, the terminal device controls operation of the sensing system based on a control instruction of a user.
The control of the RFID reader 11 by the terminal device 16 may be realized by a wired communication protocol or a wireless communication protocol. The wired communication protocol can be an Ethernet protocol, a serial port protocol, an I2C protocol, an SPI protocol and the like; the wireless communication protocol may be a Wi-Fi, bluetooth, Zigbee protocol, or the like.
Preferably, the terminal device 16 is connected to the RFID reader/writer 11 in a wireless communication manner.
Further, the RFID reader 11 is further configured to extract wireless signal characteristic information from the third wireless signal;
the terminal device 16 is further configured to receive the characteristic information of the wireless signal sent by the RFID reader 11, and analyze and process the characteristic information of the wireless signal.
Specifically, the radio signal characteristic information includes an amplitude, a phase, and a doppler frequency of the third radio signal. At different moments, the wireless signal characteristic information sent by the RFID reader-writer may be different, and the terminal device may store and display the wireless signal characteristic information at multiple moments, so that a user can directly observe the change condition of the wireless signal characteristic information.
Further, the RFID reader 11 is further configured to output alarm information when the characteristic information of the wireless signal does not match with the characteristic information of a historical wireless signal, where the historical wireless signal characteristic information is extracted from a third wireless signal received by the RFID reader 11 at a historical time.
It can be understood that, at different times, the RFID reader may receive different third wireless signals, and according to the feature information of the third wireless signals, the RFID reader may determine whether the property of the target to be detected changes based on the change of the feature of the third wireless signals. If the characteristic information of the wireless signal (which refers to the characteristic information of the wireless signal at the current moment) is obviously changed compared with the characteristic information of the wireless signal at the historical moment, the RFID reader-writer needs to output alarm information to prompt a user to deal with potential danger. Wherein, the user can set the alarm threshold value based on the characteristic information of the historical wireless signals. When the change of the wireless signal characteristic information exceeds the threshold value, the change of the property of the target to be detected is large; when the change of the wireless signal characteristic information does not exceed the threshold value, the change of the property of the target to be detected is small, and no alarm is needed.
Referring to fig. 4, fig. 4 is a schematic diagram of a first embodiment of a physical structure of a sensing system according to the present invention, where the sensing system includes a terminal device, a reader/writer, a transceiver antenna, a sensing component, a shielding case and a tag, where the shielding case is further provided with a cylindrical container for placing an object to be detected, and the shielding case is in the form of a shielding net, which does not completely separate the space inside and outside the shielding case, but has an electromagnetic shielding function. The terminal equipment is in communication connection with the reader-writer in a wireless mode.
In this embodiment, the reader is an RFID reader, the sensing component is disposed on one side of the container wall, and the tag is disposed on the other side of the container wall, so as to achieve the purpose of disposing the sensing component between the tag and the transceiver antenna.
Referring to fig. 5, fig. 5 is a partial schematic view of a second embodiment of the solid structure of the sensing system of the present invention, in which the target to be detected is a liquid level. Referring to fig. 5, the sensing system does not need to be provided with a sensing component, the liquid container is used for containing liquid to be treated, the label is positioned at the bottom of the container, and when the liquid in the container is about to flow out, the sensing system sends out alarm information.
Referring to fig. 6, fig. 6 is a schematic structural diagram of the sensing component of the present invention. The materials of the sensing component are described above and will not be described in detail here.
The technical scheme of the utility model provides a detection system of RFID sensing, the system includes RFID read write line, receiving and dispatching antenna, passive label, sensing element and shield cover; the receiving and transmitting antenna is in wired connection with the RFID reader-writer, and the receiving and transmitting antenna, the sensing component and the passive tag are arranged in the shielding case; the shielding cover is used for shielding external electromagnetic interference and placing a target to be detected; the RFID reader-writer is used for transmitting a first wireless signal through the transceiving antenna when the target to be detected is placed in the shielding case; the passive tag is used for receiving the first wireless signal, acquiring energy from the first wireless signal and sending a second wireless signal based on the first wireless signal; the sensing component is used for adjusting a wireless channel between the transceiving antenna and the passive tag in the shielding case when the state of the object to be detected is monitored to change, so as to adjust the characteristics of the second wireless signal and obtain a third wireless signal; the RFID reader-writer is also used for receiving the third wireless signal through the transceiving antenna.
In the existing passive sensing scheme, when a passive tag transmits a wireless signal, the signal is interfered by external electromagnetic waves, so that the detection false alarm rate is too high. And the system, all set up receiving and dispatching antenna, label and sensing part in the shield cover that has electromagnetic shield function, the third radio signal that receiving and dispatching antenna received can not receive external electromagnetic wave's interference to sensing system's false alarm rate has been reduced.
The above is only the optional embodiment of the present invention, and not therefore the limit of the patent scope of the present invention, all of which are in the concept of the present invention, the equivalent structure transformation of the content of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (10)
1. An RFID sensing system is characterized by comprising an RFID reader-writer, a transceiving antenna, a passive tag, a sensing component and a shielding case; wherein,
the receiving and transmitting antenna is in wired connection with the RFID reader-writer, and the receiving and transmitting antenna, the sensing component and the passive tag are arranged in the shielding case;
the shielding cover is used for shielding external electromagnetic interference and placing a target to be detected;
the RFID reader-writer is used for transmitting a first wireless signal through the transceiving antenna when the target to be detected is placed in the shielding case;
the passive tag is used for receiving the first wireless signal, acquiring energy from the first wireless signal and sending a second wireless signal based on the first wireless signal;
the sensing component is used for adjusting a wireless channel between the transceiving antenna and the passive tag in the shielding case when the state of the object to be detected is monitored to change, so as to adjust the characteristics of the second wireless signal and obtain a third wireless signal;
the RFID reader-writer is also used for receiving the third wireless signal through the transceiving antenna.
2. The system of claim 1, further comprising a terminal device communicatively coupled to the RFID reader;
the terminal equipment is used for receiving a control instruction sent by a user when the target to be detected is placed in the shielding case, and acquiring an issuing instruction based on the control instruction;
the RFID reader-writer is further used for generating the first wireless signal when receiving the issuing instruction and transmitting the first wireless signal through the transceiving antenna.
3. The system of claim 2,
the RFID reader-writer is also used for extracting wireless signal characteristic information from the third wireless signal;
the terminal device is also used for receiving the wireless signal characteristic information sent by the RFID reader-writer and analyzing and processing the wireless signal characteristic information.
4. The system of claim 1,
the RFID reader-writer is further configured to output alarm information when the characteristic information of the wireless signal is not matched with the characteristic information of the historical wireless signal, wherein the historical wireless signal characteristic information is extracted from a third wireless signal received by the RFID reader-writer at a historical time.
5. The system of claim 1,
the sensing part is arranged between the transceiving antenna and the passive tag, a gap is formed between the sensing part and the transceiving antenna, a gap is formed between the sensing part and the passive tag, and the target to be detected surrounds the sensing part.
6. The system of claim 1, wherein the passive tag has a tag antenna, the tag antenna being made of a conductive metal material;
the passive tag is used for receiving the first wireless signal by using the tag antenna; and adjusting the impedance of the tag antenna by using pre-stored data so as to send the second wireless signal through the tag antenna after impedance adjustment.
7. The system of claim 2, wherein the terminal device is connected in wireless communication with the RFID reader.
8. The system of claim 3, wherein the wireless signal characteristic information includes an amplitude, a phase, and a Doppler frequency of the third wireless signal.
9. The system of claim 1, wherein the sensing component is made of a moisture-sensitive material, a temperature-sensitive material, or a gas-sensitive material.
10. The system of claim 1, wherein the passive tag is a dry tag or a wet tag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121327962.XU CN215006687U (en) | 2021-06-15 | 2021-06-15 | RFID sensing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121327962.XU CN215006687U (en) | 2021-06-15 | 2021-06-15 | RFID sensing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215006687U true CN215006687U (en) | 2021-12-03 |
Family
ID=79128682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121327962.XU Active CN215006687U (en) | 2021-06-15 | 2021-06-15 | RFID sensing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215006687U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113326904A (en) * | 2021-06-15 | 2021-08-31 | 深圳市鹏汇智能科技有限公司 | RFID sensing system and detection method |
-
2021
- 2021-06-15 CN CN202121327962.XU patent/CN215006687U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113326904A (en) * | 2021-06-15 | 2021-08-31 | 深圳市鹏汇智能科技有限公司 | RFID sensing system and detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2774085B1 (en) | Array of rfid tags with sensing capability | |
| EP2666129B1 (en) | Sensing the properties of a material loading a uhf rfid tag by analysis of the complex reflection backscatter at different frequencies and power levels | |
| US7994922B2 (en) | Communications system and method with A/D converter | |
| US20080030324A1 (en) | Data communication with sensors using a radio frequency identification (RFID) protocol | |
| US9697397B2 (en) | Utilization of motion and spatial identification in mobile RFID interrogator | |
| CN215006687U (en) | RFID sensing system | |
| WO2020035306A1 (en) | Moisture sensors | |
| CN107655585A (en) | A kind of passive implanted temperature-detecting device, system and method | |
| CN102622641A (en) | Passive radio frequency sensing device | |
| Redemske et al. | Design of UHF RFID emulators with applications to RFID testing and data transport | |
| Jiang et al. | RFID tag antenna based wireless sensing method for medical transfusion applications | |
| CN113326904A (en) | RFID sensing system and detection method | |
| US20220327295A1 (en) | Tag system with a modulator of an antenna modulator and methods of use | |
| JP4265554B2 (en) | Tag communication device, tag communication method, and tag communication system | |
| WO2003036552A1 (en) | Remote sensor or transducer system and a mobile communication device | |
| CN103033683A (en) | Passive radio frequency identification devices (RFID) electronic tag resonant frequency detection system based on Chirp signal and passive RFID electronic tag resonant frequency detection method based on the Chirp signal | |
| Görtschacher et al. | UHF RFID sensor tag antenna concept for stable and distance independent remote monitoring | |
| CN212181474U (en) | Passive sensing system | |
| CN207351579U (en) | A kind of passive implanted temperature-detecting device and system | |
| CN116697878A (en) | Dynamic high-frequency RFID wireless sensing system and dynamic strain detection method | |
| CN208538157U (en) | A kind of label apparatus and object translocation identifying system based on RFID technique | |
| CN207502735U (en) | Active gun stock label apparatus | |
| CN106805942A (en) | Human Physiology information gathering component, human body physiological parameter measuring apparatus and system | |
| CN104160410B (en) | Trigger event is produced by RFID marker | |
| JPH08313628A (en) | Mobile identifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |