Wireless sensing device, system and method

Abstract

The invention discloses a wireless sensing device, system and method. A frequency conversion communication system is adopted, an antenna receives a first frequency signal, a frequency conversion module converts a first microwave signal into a frequency conversion signal with a second frequency, and a sensing module loads sensing information to the frequency conversion signal to form a frequency conversion signal carrying the sensing information. And then, the antenna couples and outputs the frequency conversion signal carrying the sensing information to a free space. And the receiving and transmitting device at the far end can obtain and demodulate corresponding sensing information according to the power change. A plurality of problems of distance limitation and the like caused by same-frequency blocking of an existing same-frequency communication system such as RFID (Radio Frequency Identification Device) are solved. According to the invention, through further arrangement, the sensing module is not arranged on a signal transmission path of the first microwave signal from the antenna to the frequency conversion module, so that the power loss of the first microwave signal caused by the sensing quantity change is avoided, the demodulation precision is ensured, and the wireless sensing distance is also ensured.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and more specifically, to a wireless sensing device, system and method. Background Art

[0002] Existing IoT technologies can be divided into active IoT technologies and passive IoT technologies based on whether the terminal needs external energy supply. Existing active IoT technologies require batteries or wired methods to provide DC power to the terminal, which requires operations such as battery replacement or wiring installation, greatly increasing the cost of terminal deployment and subsequent maintenance. Common passive IoT technologies such as RFID often have the same frequency for uplink and downlink carrier signals, which can easily lead to practical difficulties such as same-frequency blocking and limited wireless communication distance, and the above difficulties are difficult to overcome.

[0003] In response to the above problems, passive wireless frequency conversion technology came into being, but it still has some shortcomings. For example, the existing passive wireless frequency conversion technology faces the problem of limited frequency change range of frequency conversion. When the frequency change caused by the change of control quantity or sensor quantity is too small, it is not only difficult to ensure the accuracy of information demodulation, but also very easy to cause information demodulation errors. Summary of the invention

[0004] The present invention overcomes the deficiencies of the prior art and provides a wireless sensing device, system and method, in the hope of solving at least one of the aforementioned problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides a wireless sensor device:

[0006] Including antenna, sensor module, frequency conversion module;

[0007] The frequency conversion module and the sensor module are electrically connected to the antenna respectively;

[0008] The antenna is used to receive a first microwave signal with a first frequency and send a frequency conversion signal with a second frequency;

[0009] The frequency conversion module is used to convert the first frequency into a second frequency;

[0010] The impedance of the sensing module changes as the sensing measurement changes;

[0011] The power of the variable frequency signal changes with the impedance of the sensor module.

[0012] The main working process of the above wireless sensor device is as follows: the antenna receives a first microwave signal of a first frequency in free space, the first microwave signal is transmitted to the frequency conversion module, the frequency conversion module converts the first microwave signal into a frequency conversion signal with a second frequency, and then the sensing module converts the sensing quantity change into an impedance change, thereby changing the power of the frequency conversion signal output from the antenna, thereby loading the sensing information onto the frequency conversion signal to form a frequency conversion signal carrying the sensing information. Subsequently, the antenna couples the frequency conversion signal carrying the sensing information to the free space.

[0013] The present invention has the following advantages. On the one hand, due to the adoption of a variable frequency communication system, many problems such as distance limitation caused by co-frequency blocking of existing co-frequency communication systems such as RFID are overcome; on the other hand, the sensing information is obtained by obtaining the relationship between the sensing quantity and the power at a fixed frequency, which can avoid the problem of limited frequency variation range of the variable frequency.

[0014] A further technical solution is that the antenna and the sensor module are integrated into one or connected by wires.

[0015] A further technical solution is that the frequency conversion module includes a transistor with a heterojunction, or a Schottky diode, or a tunneling diode.

[0016] A further technical solution is that the frequency conversion module includes a modulation element, a first resonant network, and a second resonant network;

[0017] The modulation element includes three ports, namely a first modulation port, a second modulation port, and a third modulation port;

[0018] The first modulation port is used to input a signal received by the antenna and output a frequency conversion signal;

[0019] The second modulation port of the modulation element is electrically connected to the first resonant network;

[0020] The third modulation port of the modulation element is electrically connected to the second resonant network.

[0021] The specific working principle of the frequency conversion module can be found in the prior Chinese patent application (CN202310112908.0). The frequency conversion module can solve the problem of same-frequency blocking in the prior art.

[0022] A further technical solution is that the sensor module includes a sensor device;

[0023] Alternatively, the sensor module includes a sensor device and a tag information device, and the sensor device is electrically connected to the tag information device;

[0024] The tag information device includes preset tag information, and the tag information device is used to output a radio frequency signal carrying the preset tag information.

[0025] By adding a tag information device, the first microwave signal input to the sensing module is modulated by the sensing device and the tag information device to output a frequency conversion signal carrying the tag information or the tag information.

[0026] A further technical solution is that the wireless sensor device further includes a path constraint module;

[0027] The path constraint module includes at least three ports and is configured to prevent the sensing module from being arranged on a signal transmission path of the first microwave signal from the antenna to the frequency conversion module;

[0028] The antenna, the frequency conversion module and the sensor module are electrically connected to one of the at least three ports respectively.

[0029] The working distance of the wireless sensor device is closely related to the link loss. If the sensor module is directly electrically connected to the antenna, the impedance change of the sensor module will affect the first frequency (f in ) causes a certain degree of power loss in the first microwave signal, thus shortening the working distance of the wireless sensor device. The path constraint module is used and configured so that the sensing module is not arranged on the signal transmission path of the first microwave signal from the antenna to the frequency conversion module, thereby avoiding the power loss caused by the sensing module.

[0030] A further technical solution is that the path constraint module includes a circulator; the circulator includes three ports, namely a first ring port, a second ring port, and a third ring port; the antenna is electrically connected to the first ring port, the frequency conversion module is electrically connected to the second ring port, and the sensor module is electrically connected to the third ring port;

[0031] Alternatively, the path constraint module includes a first filter and a second filter; two ends of the first filter are electrically connected to the antenna and the frequency conversion module respectively, one end of the second filter is electrically connected to the sensing module, and the other end is electrically connected between the first filter and the frequency conversion module and between the first filter and the antenna respectively;

[0032] Alternatively, the path constraint module includes a duplexer or a multiplexer; the duplexer or the multiplexer includes a third filter and a fourth filter; the first ends of the third filter and the fourth filter are both electrically connected to the antenna; the second ends of the third filter and the fourth filter are both electrically connected to the frequency conversion module and the sensing module.

[0033] When the path constraint module includes a circulator, the first microwave signal enters the frequency conversion module from the antenna through the circulator in sequence, and the frequency conversion module outputs a frequency conversion signal of the second frequency and enters the sensor module. After that, the frequency conversion signal carrying the sensing information reaches the antenna from the sensor module through the circulator and is finally coupled and outputted through the antenna. The sensor module is not arranged on the transmission path of the first microwave signal, and will not cause power loss of the first microwave signal.

[0034] When the path constraint module includes the first filter and the second filter or the path constraint module includes a duplexer or a multiplexer, in fact, the sensing module is not arranged on the signal transmission path of the first microwave signal from the antenna to the frequency conversion module, thereby reducing the power loss of the first microwave signal.

[0035] A further technical solution is that a filter is provided between the sensor module and the third annular port; the filter is used to allow only the variable frequency signal to pass through.

[0036] The combination of the circulator and the filter makes the frequency and power of the frequency conversion signal in the second frequency range reaching the sensor module very stable. On the one hand, this provides accuracy guarantee for the remote transceiver to demodulate the corresponding sensing information according to the power change of the received fixed frequency (i.e., the second frequency); on the other hand, the sensor module is not set on the transmission path of the first microwave signal, which will not cause the power loss of the first microwave signal, thus ensuring the wireless transmission distance of the wireless sensor transposition.

[0037] The present invention also provides a wireless sensing system, comprising a transceiver, and the wireless sensing device as described above;

[0038] The transceiver is used to send a first microwave signal of a first frequency to the wireless sensor device, and receive a frequency conversion signal of a second frequency returned by the wireless sensor device, wherein the frequency conversion signal carries sensing information and / or tag information.

[0039] A further technical solution is that the sensing module of the wireless sensing device includes a sensing device, or a sensing device and a tag information device, and different tag information is preset in the tag information device of the wireless sensing device.

[0040] In the radio frequency signals returned by different tag information devices, different wireless sensor devices can be identified by identifying preset identity information and corresponded to corresponding physical quantities and test locations.

[0041] The present invention also provides a wireless sensing method, comprising the following steps:

[0042] The antenna receives a first microwave signal of a first frequency in free space, and transmits the first microwave signal to the frequency conversion module;

[0043] The frequency conversion module converts the first microwave signal into a frequency conversion signal having a second frequency;

[0044] The sensing module loads the sensing information and / or the tag information onto the frequency conversion signal;

[0045] The antenna couples the frequency-converted signal carrying the sensing information and / or the tag information into free space for output;

[0046] The transceiver receives the frequency conversion signal carrying the sensor information and / or tag information, and demodulates the corresponding sensor information and / or tag information according to the power change of the frequency conversion signal.

[0047] Compared with the prior art, the present invention has at least the following beneficial effects:

[0048] (1) The use of a variable frequency communication system overcomes many problems such as limited distance caused by frequency blocking in existing RFID and other same-frequency communication systems;

[0049] (2) Obtaining sensor information through the relationship between the sensor quantity and the power at a fixed frequency can solve the problem of limited frequency variation range of variable frequency;

[0050] (3) By setting up a path constraint module and configuring it so that the sensing module is not set on the signal transmission path of the first microwave signal from the antenna to the frequency conversion module, the power loss of the first microwave signal caused by the change of the sensing quantity is avoided, which not only ensures the demodulation accuracy of the sensing information obtained according to the power change of the frequency conversion signal, but also ensures the wireless sensing distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0052] Figure 2 A schematic diagram of power variation according to another embodiment of the present invention;

[0053] Figure 3 It is a structural schematic diagram of another embodiment of the present invention;

[0054] Figure 4 It is a structural schematic diagram of another embodiment of the present invention;

[0055] Figure 5 It is a structural schematic diagram of another embodiment of the present invention;

[0056] Figure 6 It is a structural schematic diagram of another embodiment of the present invention;

[0057] Figure 7 It is a structural schematic diagram of another embodiment of the present invention;

[0058] Figure 8 It is a structural schematic diagram of another embodiment of the present invention;

[0059] Fig. 9 It is a schematic structural diagram of an embodiment of the present invention.

[0060] In the figure, 10-wireless sensor device; 11-antenna; 12-sensing module; 121-sensing device; 122-tag information device; 13-frequency conversion module; 131-modulation element; 132-first resonant network; 133-second resonant network; 14-path constraint module; 15-first filter; 16-second filter; 17-third filter; 18-fourth filter; 20-transceiver. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0062] Figure 1 A wireless sensor device of the present invention is shown, comprising an antenna 11, a sensor module 12, and a frequency conversion module 13;

[0063] The frequency conversion module 13 and the sensor module 12 are electrically connected to the antenna 11 respectively;

[0064] The antenna 11 is used to receive a first microwave signal with a first frequency and send a frequency conversion signal with a second frequency;

[0065] The impedance of the sensing module 12 changes as the sensing measurement changes;

[0066] The frequency conversion module 13 is used for signal frequency conversion, that is, converting a first microwave signal of a first frequency into a frequency conversion signal of a second frequency.

[0067] Exemplarily, the frequency conversion module 13 includes a transistor with a heterojunction, or a Schottky diode, or a tunneling diode.

[0068] When in use, the antenna 11 receives a first microwave signal of a first frequency in free space, and the first microwave signal is transmitted to the frequency conversion module 13. The frequency conversion module 13 converts the first microwave signal into a frequency conversion signal with a second frequency, and then the sensor module 12 loads the sensing information onto the frequency conversion signal to form a frequency conversion signal carrying the sensing information. Subsequently, the antenna 11 couples the frequency conversion signal carrying the sensing information and / or tag information to the free space.

[0069] Figure 2The power change of the variable frequency signal carrying the sensing information caused by the change of the sensing measurement is shown. Among them, the horizontal axis is frequency, the vertical axis is power, and the curve C1 is the power curve of the variable frequency signal before the sensing measurement changes. It has a depression with a certain bandwidth. The frequency corresponding to the minimum value P1 of the depression is the locking frequency, which is the second frequency. Curve C2 is the power curve of the variable frequency signal after the sensing measurement changes. It has a frequency offset relative to curve C1. At this time, the power value corresponding to the locking frequency is P2. According to the relationship between the power change and the sensing measurement at the pre-calibrated second frequency, the corresponding sensing measurement size can be obtained.

[0070] Through the above settings, on the one hand, due to the adoption of the variable frequency communication system, many problems such as distance limitation caused by the same frequency blocking of the existing RFID and other same frequency communication systems are overcome; on the other hand, obtaining the sensor information through the relationship between the sensor quantity and the power at a fixed frequency can avoid the problem of limited frequency variation range of the variable frequency.

[0071] In some embodiments, the sensor module 12 includes a sensor device 121. In a preferred embodiment, the sensor device 121 is a passive sensor, which can be a resistive passive sensor or a reactive passive sensor. The reactive passive sensor includes an inductive passive sensor and a capacitive passive sensor.

[0072] The sensing quantity of the sensor device 121 may be any suitable physical quantity, including but not limited to temperature, humidity, vibration, pressure, strain, acceleration, dielectric constant, etc. Whether it is a resistive passive sensor or a reactive passive sensor, a change in the sensing quantity will cause a change in its impedance.

[0073] The power of the frequency conversion signal output by the antenna 11 is affected by the impedance of the sensor module 12. The remote transceiver 20 can demodulate the corresponding sensing information according to the power change of the received locking frequency (i.e., the second frequency). The relationship between the sensing amount and the power at the locking frequency can be obtained by pre-calibration.

[0074] In some embodiments, the antenna 11 and the sensor module 12 are integrated. For example, the sensor module 12 is directly attached to the antenna 11 , and the sensor module 12 and the antenna 11 are electrically connected.

[0075] In some embodiments, the antenna 11 and the sensor module 12 are separated. For example, the sensor module 12 and the antenna 11 are electrically connected via a wire.

[0076] In some embodiments, the impedance of the antenna 11 is fixed, and the impedance change of the sensor module 12 caused by the change in the sensing measurement affects the power of the variable frequency signal output by the antenna 11 .

[0077] In some embodiments, the impedance of the antenna 11 is variable, and the impedance change of the sensor module 12 caused by the change in the sensing amount affects the power of the variable frequency signal output by the antenna 11. In this case, the sensor module 12 can be integrated with the antenna 11, and the impedance of the sensor module 12 is used as part of the overall impedance of the antenna 11. The impedance change of the sensor module 12 caused by the change in the sensing amount directly affects the overall impedance change of the antenna 11.

[0078] Figure 3 A wireless sensor device according to an embodiment of the present invention is shown. Based on any of the above embodiments, the frequency conversion module 13 of this embodiment includes a modulation element 131, a first resonant network 132, and a second resonant network 133;

[0079] The modulation element 131 includes three ports, namely a first modulation port T11, a second modulation port T12, and a third modulation port T13;

[0080] The first modulation port T11 is used to input the first microwave signal received by the antenna 11 and output the frequency conversion signal;

[0081] The second modulation port T12 of the modulation element 131 is electrically connected to the first resonant network 132;

[0082] The third modulation port T13 of the modulation element 131 is electrically connected to the second resonant network 133 .

[0083] The specific working principle of the frequency conversion module 13 can be found in the prior Chinese patent application (CN202310112908.0), and the modulation element 131 can be a transistor with a heterojunction, for example, a heterojunction bipolar transistor, a field effect transistor (FET), etc. The FET can be a metal oxide semiconductor field effect transistor (MOSFET), a two-dimensional electron gas transistor, or a high electron mobility transistor (HEMT).

[0084] In some embodiments, the modulation element 131 is a transistor with a two-dimensional electron gas. The modulation element 131 is used to establish a passive transmission channel between the drain and the source and between the source and the gate for microwave signals; the first resonant network 132 is used to converge the energy of the microwave signal fed in, and feed the microwave signal after energy convergence into the second resonant network 133; the second resonant network 133 is used to generate an oscillation signal according to the microwave signal fed in by the first resonant network 132, and feed the oscillation signal into the transistor with a two-dimensional electron gas.

[0085] Figure 4 A wireless sensor device according to an embodiment of the present invention is shown. Based on any of the above embodiments, the sensor module 12 of this embodiment includes a sensor device 121 and a tag information device 122;

[0086] The sensor device 121 is electrically connected to the tag information device 122;

[0087] The tag information device 122 has preset tag information, and the tag information device 122 is used to output a radio frequency signal with the preset tag information.

[0088] In some embodiments, the tag information includes tag information of the wireless sensor device; or includes tag information of the wireless sensor device and location information of the wireless sensor device.

[0089] It should be noted that the sensor device 121 can be integrated with the tag information device 122 or connected via a wire.

[0090] The tag information device 122 may be a passive tag information device 122 based on the surface acoustic wave principle or a passive tag information device 122 based on the electromagnetic scattering principle.

[0091] In some embodiments, the tag information device 122 is a passive tag information device 122 based on the surface acoustic wave principle. Specifically, a transducer and a plurality of reflective structures are arranged on the surface of the piezoelectric material, and the plurality of reflective structures carry the tag information.

[0092] In this case, the frequency conversion signal is first converted into a surface acoustic wave by the transducer, and the surface acoustic wave is then converted into a radio frequency signal by the transducer after being reflected by a number of reflection structures, i.e., a frequency conversion signal carrying tag information. The sensor device 121 can be integrated with the tag information device 122, or can be a separate device. The impedance change of the sensor device 121 affects the reflection characteristics of a number of reflection structures in the tag information device 122, and the radio frequency signal output from the transducer of the tag information device 122 is a frequency conversion signal carrying tag information and sensor information.

[0093] In some embodiments, a passive tag information device 122 based on the principle of electromagnetic scattering may be used. Passive tag information devices based on the principle of electromagnetic scattering can be divided into time domain passive tag information devices and frequency domain passive tag information devices. The time domain passive tag information device includes a delay line, which receives and transmits pulses carrying information back to the transceiver. The time domain passive tag information device uses a resonant structure to encode data into the spectrum.

[0094] The working distance of the wireless sensor device 10 is closely related to the link loss. Research has found that in the above-mentioned embodiment, since the sensor module 12 is directly electrically connected to the antenna 11, the impedance change of the sensor module 12 when the sensing amount changes will cause a certain degree of power loss to the first microwave signal of the first frequency coupled and received by the antenna 11, thereby shortening the working distance of the wireless sensor device 10. To solve the above technical problems, it can be achieved by changing the setting path of the sensor module 12. Specifically, it is only necessary to ensure that the sensor module 12 is not set on the signal transmission path of the first microwave signal along the antenna 11 to the frequency conversion module 13.

[0095] Figure 5 A wireless sensor device according to an embodiment of the present invention is shown, comprising an antenna 11, a sensor module 12, a frequency conversion module 13, and a path constraint module 14;

[0096] The path constraint module 14 includes at least three ports and is configured to prevent the sensing module 12 from being arranged on the signal transmission path of the first microwave signal from the antenna 11 to the frequency conversion module 13;

[0097] The antenna 11, the frequency conversion module 13, and the sensor module 12 are electrically connected to at least one of the three ports respectively;

[0098] The antenna 11 is used to receive a first microwave signal with a first frequency and send a frequency conversion signal with a second frequency;

[0099] The frequency conversion module 13 is used to convert the first frequency into a second frequency;

[0100] The impedance of the sensing module 12 changes as the sensing measurement changes;

[0101] The power of the variable frequency signal changes as the impedance of the sensor module 12 changes.

[0102] The path constraint module 14 is used to prevent the sensor module 12 from being arranged on the signal transmission path of the first microwave signal from the antenna 11 to the frequency conversion module 13. In this way, the sensor module 12 is not arranged on the transmission path of the first microwave signal, which will not cause power loss of the first microwave signal, thereby ensuring the wireless transmission distance of the wireless sensor transposition.

[0103] Typically, the path constraint module 14 can be a multi-port passive non-reciprocal device, such as a three-port circulator or a four-port circulator. Non-reciprocity is a term used in microwave technology, which means that electromagnetic waves will exhibit different electromagnetic losses, phase shifts, and other characteristics when transmitted in two opposite directions in an object. This phenomenon is called non-reciprocity.

[0104] Figure 6A wireless sensor device according to an embodiment of the present invention is shown. Based on the above-mentioned embodiment, the path constraint module 14 includes a circulator;

[0105] The circulator includes three ports, namely a first ring port, a second ring port, and a third ring port;

[0106] The antenna 11 is electrically connected to the first ring port, the frequency conversion module 13 is electrically connected to the second ring port, and the sensor module 12 is electrically connected to the third ring port.

[0107] When working, it has a first frequency (f in ) enters the frequency conversion module 13 from the antenna 11 through the first port T21 and the second port T22 of the circulator in sequence, and has a second frequency (f out ) enters the sensor module 12 from the frequency conversion module 13 through the second port T22 and the third port T23 of the circulator. Afterwards, the frequency conversion signal carrying the sensing information reaches the antenna 11 from the sensor module 12 through the third port T23 and the first port T21 of the circulator, and is finally coupled out through the antenna 11.

[0108] In this configuration, the sensor module 12 is not disposed on the transmission path of the first microwave signal, which will not cause power loss of the first microwave signal, thereby ensuring the wireless transmission distance of the wireless sensor transposition.

[0109] In some embodiments, a filter is disposed between the sensor module 12 and the third annular port; the filter is used to allow only the variable frequency signal to pass through.

[0110] The filter is used to allow frequency signals in the second frequency range to pass and other frequency signals to not pass. The second frequency range is a second frequency (f out ) is the center frequency, and the bandwidth is the frequency range of the second bandwidth. Due to the setting of the filter, only the signal of the second frequency range with the second frequency as the center frequency can reach the sensor module 12; the combination of the circulator and the filter makes the frequency and power of the signal of the second frequency range reaching the sensor module 12 very stable.

[0111] Figure 7 A wireless sensor device according to an embodiment of the present invention is shown. Based on the above embodiment, the path constraint module 14 includes a first filter 15 and a second filter 16;

[0112] Two ends of the first filter 15 are electrically connected to the antenna 11 and the frequency conversion module 13 respectively. One end of the second filter 16 is electrically connected to the sensor module 12, and the other end is electrically connected between the first filter 15 and the frequency conversion module 13 and between the first filter 15 and the antenna 11 respectively.

[0113] The first filter 15 is used to allow frequency signals in a first frequency range to pass through and other frequency signals to not pass through. The first frequency range is a first frequency (f in ) is the center frequency, and the bandwidth is the frequency range of the first bandwidth;

[0114] The second filter 16 is used to allow frequency signals in a second frequency range to pass through and other frequency signals to not pass through. The second frequency range is a second frequency (f out ) is the center frequency, the bandwidth is the frequency range of the second bandwidth, and the first frequency range and the second frequency range have no overlap.

[0115] When working, it has a first frequency (f in ) enters the frequency conversion module 13 through the antenna 11 and the first filter 15 in sequence, and has a second frequency (f out ) enters the sensor module 12 from the frequency conversion module 13 through the second filter 16 in sequence, and then the frequency conversion signal carrying the sensing information reaches the antenna 11 from the sensor module 12 through the second filter 16, and is finally coupled and outputted through the antenna 11.

[0116] The combination of the above technical means makes the frequency and power of the signal in the second frequency range reaching the sensor module 12 very stable, provides accuracy guarantee, and ensures the wireless transmission distance.

[0117] In some embodiments, the path constraint module 14 may be a duplexer or a multiplexer, such as Figure 8 As shown;

[0118] The first ends (i.e., common ports) of the third filter 17 and the fourth filter 18 of the duplexer or multiplexer are electrically connected to the antenna 11;

[0119] The second ends of the third filter 17 and the fourth filter 18 of the duplexer or multiplexer are electrically connected to the frequency conversion module 13 and the sensor module 12 .

[0120] When a multiplexer is used, only two appropriate filter channels need to be selected.

[0121] Fig. 9 A wireless sensor system according to an embodiment of the present invention is shown, comprising a transceiver 20 and a plurality of wireless sensor devices according to any of the above embodiments;

[0122] The transceiver 20 is used to send a first frequency (f in ) microwave signal, and receiving the second frequency (f out ) frequency conversion signal, the second frequency is different from the first frequency.

[0123] In some embodiments, the number of wireless sensor devices is at least 2;

[0124] The sensor module 12 of the wireless sensor device includes a sensor device 121 and a tag information device 122;

[0125] The sensor device 121 is electrically connected to the tag information device 122;

[0126] The tag information device 122 has preset tag information. The tag information device 122 is used to output a radio frequency signal with the preset tag information. In this embodiment, different tag information devices 122 have different preset tag information.

[0127] In the radio frequency signals returned by different tag information devices 122, different wireless sensor devices can be identified by identifying the preset tag information and corresponded to the corresponding physical quantities and test positions.

[0128] In one embodiment of the present invention, a wireless sensing method is provided, comprising the following steps:

[0129] S1: The antenna 11 receives a first microwave signal of a first frequency in a free space, and transmits the first microwave signal to the frequency conversion module 13;

[0130] S2: The frequency conversion module 13 converts the first microwave signal into a frequency conversion signal having a second frequency;

[0131] S3: The sensing module 12 loads the sensing information and / or the tag information onto the frequency conversion signal;

[0132] S4: The antenna 11 couples the frequency conversion signal carrying the sensing information and / or tag information to the free space;

[0133] S5: The transceiver 20 receives the frequency conversion signal carrying the sensor information and / or tag information, and demodulates the corresponding sensor information and / or tag information according to the power change of the frequency conversion signal.

[0134] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, it should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in the present application. More specifically, within the scope disclosed in the present application, multiple variations and improvements can be made to the components and / or layout of the subject combination layout. In addition to the variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A wireless sensing device, characterized in that: Including antenna, sensor module, frequency conversion module; The frequency conversion module and the sensor module are electrically connected to the antenna respectively; The antenna is used to receive a first microwave signal having a first frequency and to send a frequency conversion signal having a second frequency; The frequency conversion module is used to convert the first frequency into a second frequency; The impedance of the sensing module changes as the sensing measurement changes; The power of the frequency conversion signal varies with the impedance of the sensor module.

2. A wireless sensor device as claimed in claim 1, characterized in that: The antenna and the sensor module are integrated or connected via wires.

3. A wireless sensor device as claimed in claim 1, characterized in that: The frequency conversion module includes a transistor with a heterojunction, or a Schottky diode, or a tunneling diode.

4. A wireless sensor device as claimed in claim 1, characterized in that: The frequency conversion module includes a modulation element, a first resonant network, and a second resonant network; The modulation element includes three ports, namely a first modulation port, a second modulation port, and a third modulation port; The first modulation port is used to input a signal received by an antenna and output a frequency-converted signal; The second modulation port of the modulation element is electrically connected to the first resonant network; The third modulation port of the modulation element is electrically connected to the second resonant network.

5. A wireless sensor device as claimed in claim 1, characterized in that: The sensor module includes a sensor device; Alternatively, the sensor module includes a sensor device and a tag information device, and the sensor device is electrically connected to the tag information device; The tag information device includes preset tag information, and is used to output a radio frequency signal carrying the preset tag information.

6. A wireless sensor device according to any one of claims 1 to 5, characterized in that: Including, path constraint module; The path constraint module includes at least three ports, and is configured to prevent the sensing module from being arranged on the signal transmission path of the first microwave signal from the antenna to the frequency conversion module; The antenna, the frequency conversion module, and the sensor module are electrically connected to one of the at least three ports respectively.

7. A wireless sensor device as claimed in claim 6, characterized in that: The path constraint module includes a circulator; the circulator includes three ports, namely a first ring port, a second ring port, and a third ring port; the antenna is electrically connected to the first ring port, the frequency conversion module is electrically connected to the second ring port, and the sensor module is electrically connected to the third ring port; Alternatively, the path constraint module includes a first filter and a second filter; two ends of the first filter are electrically connected to the antenna and the frequency conversion module respectively, one end of the second filter is electrically connected to the sensing module, and the other end is electrically connected between the first filter and the frequency conversion module and between the first filter and the antenna respectively; Alternatively, the path constraint module includes a duplexer or a multiplexer; the duplexer or the multiplexer includes a third filter and a fourth filter; the first ends of the third filter and the fourth filter are both electrically connected to the antenna; the second ends of the third filter and the fourth filter are both electrically connected to the frequency conversion module and the sensing module.

8. A wireless sensor device as claimed in claim 7, characterized in that: A filter is provided between the sensor module and the third annular port; the filter is used to allow only the variable frequency signal to pass through.

9. A wireless sensing system, characterized in that: It comprises a transceiver device, and a plurality of wireless sensor devices as described in any one of claims 1 to 8; The transceiver is used to send a first microwave signal of a first frequency to the wireless sensor device, and receive a frequency conversion signal of a second frequency returned by the wireless sensor device, wherein the frequency conversion signal carries sensing information and / or tag information.

10. A wireless sensing system as claimed in claim 9, characterized in that: The sensing module of the wireless sensing device includes a sensing device, or a sensing device and a tag information device. Different tag information is preset in the tag information device of the wireless sensing device.

11. A wireless sensing method, characterized in that: The following steps are involved: The antenna receives a first microwave signal of a first frequency in free space, and transmits the first microwave signal to the frequency conversion module; The frequency conversion module converts the first microwave signal into a frequency conversion signal having a second frequency; The sensing module loads the sensing information and / or the tag information onto the frequency conversion signal; The antenna couples the frequency-converted signal carrying the sensing information and / or the tag information into free space for output; The transceiver receives the frequency conversion signal carrying the sensor information and / or tag information, and demodulates the corresponding sensor information and / or tag information according to the power change of the frequency conversion signal.

Images