Wireless sensing device, method and system

Abstract

The present invention relates to the field of wireless communication technology, and proposes a wireless sensing device, method and system, wherein the wireless sensing device includes a modulation element, a first resonant network and a parallel resonant network structure, wherein the modulation element disperses the energy of a first microwave signal of a first frequency at a first port and outputs it from a second port, the first resonant network converges the dispersed energy to obtain a second microwave signal, and the second resonant network and at least one third resonant network connected in parallel in the parallel resonant network structure perform secondary frequency selection on the second microwave signal to generate an oscillating signal of a second resonant frequency affected by environmental sense measurement, which is transmitted to the modulation element through the third port to be mixed with the first microwave signal to obtain a variable frequency signal of the second frequency. The present invention sets at least one resonant network with the same impedance characteristics in parallel at the position of the second resonant network, which can expand the frequency variation range of the variable frequency signal, thereby improving the information demodulation accuracy at the transceiver end.

Description

Technical Field

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

[0002] Wireless passive sensing technology is an important development direction of Internet of Things technology. Among them, wireless passive frequency conversion sensing technology has the characteristics of strong anti-interference ability and long transmission distance, but wireless passive sensing technology still has some shortcomings.

[0003] For example, the existing passive wireless frequency conversion technology still faces the problem of limited frequency change range of frequency conversion. When the frequency change caused by the change of the 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] In order to solve at least one technical problem in the above-mentioned prior art, the present invention provides a wireless sensing device, method and system.

[0005] A first aspect of the present invention provides a wireless sensor device, comprising: a modulation element, a first resonant network, a parallel resonant network structure and a sensor module;

[0006] The modulation element comprises a first port, a second port and a third port; wherein the first port of the modulation element is configured to receive a first microwave signal having a first frequency and output a frequency conversion signal having a second frequency;

[0007] The first resonant network is electrically connected to the second port of the modulation element and is configured to converge the microwave signal output from the second port of the modulation element to obtain a second microwave signal;

[0008] The parallel resonant network structure includes a first port and a second port; wherein the first port of the parallel resonant network structure is electrically connected to the third port of the modulation element, and the parallel resonant network structure includes a second resonant network and at least one third resonant network connected in parallel with the second resonant network, and is configured to generate an oscillation signal having a second resonant frequency according to a second microwave signal, and transmit the oscillation signal to the modulation element;

[0009] The sensing module is electrically connected to the second port of the parallel resonant network structure.

[0010] Optionally, the wireless sensing device further comprises:

[0011] Matching network;

[0012] The matching network includes a first matching network arranged between the first port of the modulation element and the antenna, and / or a second matching network arranged between the second port of the modulation element and the first resonant network.

[0013] Optionally, the second resonant network and / or the third resonant network is configured as a passive piezoelectric resonant network; or, the second resonant network and the third resonant network are configured to be the same; or, the second resonant network and the third resonant network are configured to have the same impedance characteristics and the same or different impedance values.

[0014] Optionally, the modulation element is configured as a transistor having a heterojunction.

[0015] Optionally, the drain of the transistor with the heterojunction is configured as the first port of the modulation element, the source of the transistor with the heterojunction is configured as the second port of the modulation element, and the gate of the transistor with the heterojunction is configured as the third port of the modulation element.

[0016] A second aspect of the present invention provides a wireless sensing method, comprising:

[0017] S1: Connect the first resonant network to the second port of the modulation element;

[0018] S2: connecting the first port of the parallel resonant network structure to the third port of the modulation element, and connecting the second port of the parallel resonant network structure to the sensing module;

[0019] Wherein, the parallel resonant network structure includes a second resonant network and at least one third resonant network connected in parallel with the second resonant network;

[0020] S3: the first port of the modulation element inputs a first microwave signal having a first frequency;

[0021] S4: The first port of the modulation element outputs a frequency conversion signal having a second frequency.

[0022] Optionally, the first port of the modulation element inputs a first microwave signal having a first frequency, specifically including:

[0023] S31: a first port of the modulation element receives a first microwave signal of a first frequency, and a second port outputs a microwave signal obtained by dispersing energy of the first microwave signal;

[0024] S32: The first resonant network re-converges the microwave signal after energy dispersion to obtain a second microwave signal, and the second microwave signal is fed into the parallel resonant network structure.

[0025] Optionally, the first port of the modulation element outputs a frequency conversion signal having a second frequency, specifically including:

[0026] S41: the second resonant network in the parallel resonant network structure and at least one third resonant network connected in parallel with the second resonant network generate an oscillation signal of a second resonant frequency according to a second microwave signal;

[0027] S42: The modulation element outputs a frequency conversion signal having a second frequency obtained by mixing the oscillation signal with the first microwave signal.

[0028] Optionally, the second resonant network and the third resonant network are configured to be identical; or, the second resonant network and the third resonant network are configured to have identical impedance characteristics and identical or different impedance values.

[0029] A third aspect of the present invention provides a wireless sensing system, comprising:

[0030] Transceiver device;

[0031] A wireless sensing device as described in any of the preceding items;

[0032] The transceiver device is configured to transmit a first microwave signal with a first frequency to the wireless sensor device, and receive a frequency conversion signal with a second frequency transmitted by the wireless sensor device.

[0033] A fourth aspect of the present invention provides a wireless sensing method, which is used in the wireless sensing system as described above, comprising:

[0034] S1: The transceiver generates a first microwave signal having a first frequency and sends the first microwave signal;

[0035] S2: The wireless sensor device receives the first microwave signal and transmits back a frequency conversion signal having a second frequency;

[0036] S3: The transceiver receives the frequency conversion signal and demodulates it to obtain the information it carries.

[0037] The present invention proposes a wireless sensing device, method and system, which have at least the following beneficial effects: since at least one resonant network with the same impedance characteristics is arranged in parallel at the position of the second resonant network, the frequency variation range of the frequency conversion signal can be expanded, thereby improving the information demodulation accuracy at the transceiver end. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a wireless sensor device in the prior art;

[0039] Figure 2 A schematic diagram of a structure of a wireless sensor device provided by an embodiment of the present invention;

[0040] Figure 3A schematic diagram of the structure of a modulation element provided by an embodiment of the present invention;

[0041] Figure 4 A second structural schematic diagram of a wireless sensor device provided by an embodiment of the present invention;

[0042] Figure 5 A schematic diagram of the structure of a wireless sensor system provided by an embodiment of the present invention.

[0043] Explanation of the reference numerals: 10 - wireless sensor device; 11 - modulation element; 12 - second resonant network; 13 - first resonant network; 14 - sensor module; 15 - antenna; 16 - third resonant network; 20 - transceiver. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Figure 1 The wireless sensor device 10 in the prior art is shown, which includes a modulation element 11, a first resonant network 13, a second resonant network 12, a sensor module 14 and an antenna 15. The modulation element includes three ports, namely a first port T1, a second port T2 and a third port T3, wherein the first port T1 is used to input a first frequency ( f in ) of the first microwave signal, and outputting a second microwave signal having a frequency ( f out ) frequency conversion signal.

[0046] In this circuit, the modulation element 11 is used to establish a passive transmission channel between the first port T1 and the second port T2, and between the second port T2 and the third port T3 for the microwave signal, and to feed the microwave signal with the first frequency ( f in ) of the first microwave signal and the second resonant frequency ( f r2 ) is mixed with an oscillating signal having a second frequency ( f out ) frequency conversion signal, and then output the frequency conversion signal from the first port T1. The modulation element 11 modulates the first frequency ( f in) to disperse the energy of the first microwave signal. The first resonant network 13 is used to re-converge the microwave signal after energy dispersion to obtain a second microwave signal, and feed the second microwave signal into the second resonant network 12 after passing through the modulation element. The second resonant network 12 performs secondary frequency selection according to the fed second microwave signal to generate a stable second resonant frequency ( f r2 ) oscillation signal, and the second resonant frequency ( f r2 ) is fed into the modulation element 11 and is coupled to the first frequency ( f in ) is mixed with the first microwave signal to obtain a second frequency ( f out When the sensing amount sensed by the sensor module 14 changes, the second resonant frequency will change, and then the frequency of the variable frequency signal will change accordingly. The corresponding sensing amount can be obtained through the preset relationship between the frequency of the variable frequency signal and the sensing amount, thereby realizing wireless sensing.

[0047] In the above process, the frequency variation range of the frequency conversion signal of the wireless sensor device is narrow or limited. When the frequency variation caused by the change in the control amount or the change in the sensing amount is too small, it is not only difficult to ensure the accuracy of information demodulation, but also very easy to cause information demodulation errors. In response to this problem, the inventors found that by connecting two or more resonant networks in parallel at the position of the original second resonant network to form an equivalent resonant network, the frequency variation range of the frequency conversion signal can be expanded, thereby improving the information demodulation accuracy at the transceiver end.

[0048] Figure 2 The figure shows a schematic diagram of a wireless sensor device in an embodiment of the present invention, which can expand the frequency variation range of the frequency conversion signal, thereby improving the information demodulation accuracy at the transceiver end. Figure 1 On the basis of, the wireless sensor device includes a second resonant network 12 and a third resonant network 16, the second resonant network 12 and the third resonant network 16 are connected in parallel, one end of the parallel connection is connected to the third port T3 of the modulation element 11, and the other end is connected to the sensor module 14.

[0049] In some embodiments, a matching network is provided between the antenna 15 and the first port T1 of the modulation element 11 , and the matching network is used to achieve impedance matching of the transmission line, improve microwave signal coupling efficiency, and reduce transmission loss of the microwave signal.

[0050] In some embodiments, a matching network is provided between the first resonant network 13 and the second port T2 of the modulation element 11 , and the matching network is used to achieve impedance matching of the transmission line, improve microwave signal coupling efficiency, and reduce transmission loss of the microwave signal.

[0051] In some embodiments, the second resonant network 12 may be a passive piezoelectric resonant network, including but not limited to a passive piezoelectric crystal oscillator and a passive piezoelectric MEMS oscillator.

[0052] In some embodiments, the second resonant network 12 is identical to the third resonant network 16 .

[0053] In some embodiments, the second resonant network 12 and the third resonant network 16 have the same impedance characteristics, that is, both are capacitive networks or both are inductive networks. The impedance values ​​of the second resonant network 12 and the third resonant network 16 may not be equal.

[0054] In some embodiments, the modulation element 11 may be a transistor with a heterojunction, for example, a heterojunction bipolar transistor, a field effect transistor (FET), etc. The FET may be a metal oxide semiconductor field effect transistor (MOSFET), a two-dimensional electron gas transistor, or a high electron mobility transistor (HEMT).

[0055] Figure 3 A schematic diagram of a wireless sensor device in an embodiment of the present invention is shown, wherein the modulation element 11 is a transistor having a two-dimensional electron gas, and the drain (D) of the transistor serves as the first port T1, the source (S) serves as the second port T2, and the gate (G) serves as the third port T3.

[0056] In some embodiments, a transistor with high electron mobility is used as the modulation element 11 , and the drain (D) of the transistor is used as the first port T1 , the source (S) is used as the second port T2 , and the gate (G) is used as the third port T3 .

[0057] Figure 4 The schematic diagram of the wireless sensor device in one embodiment of the present invention is shown. On the basis of the above corresponding embodiments, the modulation element 11 adopts a transistor with high electron mobility, and the drain (D) of the transistor is used as the first port T1, the source (S) is used as the second port T2, and the gate (G) is used as the third port T3. The first resonant network 13 includes a first inductor and a first capacitor connected in parallel, the second resonant network 12 is a passive crystal oscillator, and the third resonant network 16 is a passive crystal oscillator. The impedance characteristics of the second resonant network 12 and the third resonant network 16 are the same. The sensing module 14 is a capacitive sensor; the source of the transistor is electrically connected to the first resonant network 13, one end of the second resonant network 12 and the third resonant network 16 is electrically connected to the third port T3 of the modulation element 11, and the other end of the second resonant network 12 and the third resonant network 16 is electrically connected to the sensing module 14. In this arrangement, since the third resonant network 16 is connected in parallel at the position of the second resonant network 12, the frequency variation range of the frequency conversion signal is expanded, thereby improving the information demodulation accuracy of the transceiver end.

[0058] In one embodiment of the present invention, a communication method is provided, and the specific steps are as follows:

[0059] The second resonant network 12 is connected in parallel with at least one resonant network with the same impedance characteristic, and one end of the parallel connection is connected to the third port T3 of the modulation element 11, and the other end is connected to the sensor module 14; the first port T1 of the modulation element 11 is connected to the antenna 15, and the second port T2 is connected to the first resonant network 13;

[0060] Antenna 15 receives the first frequency ( f in ) of the first microwave signal;

[0061] The antenna 15 outputs a second frequency ( f out ) frequency conversion signal.

[0062] Through the above arrangement, at least one resonant network with the same impedance characteristic is connected in parallel at the position of the second resonant network 12, which can expand the frequency variation range of the frequency conversion signal, thereby improving the information demodulation accuracy at the transceiver end.

[0063] In some embodiments, the first resonant network 13 re-converges the microwave signal after energy dispersion to obtain a second microwave signal;

[0064] In some embodiments, the second microwave signal is fed into the second resonant network 12 from at least one signal transmission path that does not pass through the modulation element 11;

[0065] In some embodiments, the second resonant network 12 generates a second resonant frequency ( f r2 ) oscillation signal;

[0066] In some embodiments, the modulation element 11 outputs an oscillation signal mixed with the first microwave signal to obtain a second frequency ( f out ) frequency conversion signal.

[0067] It should be noted that the specific implementation of the wireless sensing method of the present application refers to the above-mentioned wireless sensing device embodiment, which will not be repeated here.

[0068] Figure 5 A wireless sensing system in one embodiment of the present invention is shown, which includes a transceiver 20 and a wireless sensing device 10 disclosed in any of the above embodiments;

[0069] The transceiver 20 is used to send a first frequency ( f in ) microwave signal, and receiving the second frequency ( fout ) a frequency conversion signal, wherein the second frequency is different from the first frequency.

[0070] It should be noted that the specific implementation of the wireless sensor system of the present application refers to the above-mentioned wireless sensor device embodiment, which will not be repeated here.

[0071] In one embodiment of the present invention, a wireless sensing method is also provided, which comprises the following steps:

[0072] The transceiver 20 generates a first frequency ( f in ), and sending the first microwave signal;

[0073] The wireless sensor device 10 receives the first microwave signal and transmits back a second microwave signal having a second frequency ( f out ) frequency conversion signal;

[0074] The transceiver 20 receives the frequency-converted signal and demodulates it to obtain the information it carries.

[0075] It should be noted that the specific implementation of the wireless sensing method of the present application is basically the same as the above-mentioned wireless sensing system embodiment, and will not be repeated here.

[0076] The embodiment of the present invention proposes a wireless sensing device, method and system, wherein a first microwave signal of a first frequency at a first port is dispersed through a modulation element and output from a second port, a first resonant network converges the dispersed energy to obtain a second microwave signal, a second resonant network in parallel in a parallel resonant network structure and at least one third resonant network perform secondary frequency selection on the second microwave signal, generate an oscillating signal of a second resonant frequency affected by environmental sense measurement, and transmit it to the modulation element through the third port to mix with the first microwave signal to obtain a variable frequency signal of the second frequency. In this way, by setting at least one resonant network with the same impedance characteristics in parallel at the position of the second resonant network, the frequency variation range of the variable frequency signal can be expanded, thereby improving the information demodulation accuracy at the transceiver end.

[0077] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top", "bottom", "inside", "outside", "inner side", "outer side" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Among them, "inside" refers to an internal or enclosed area or space. "Periphery" refers to the area surrounding a specific component or a specific area.

[0078] In the description of the embodiments of the present invention, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0079] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "assemble" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the description of the embodiments of the present invention, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0081] In the description of the embodiments of the present invention, it should be understood that "-" and "~" represent a range between two values, and the range includes the endpoints. For example: "AB" represents a range greater than or equal to A, and less than or equal to B. "A~B" represents a range greater than or equal to A, and less than or equal to B.

[0082] In the description of the embodiments of the present invention, the term "and / or" herein is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " herein generally indicates that the associated objects before and after are in an "or" relationship.

[0083] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wireless sensing device, characterized in that: include: Modulation element, first resonant network, parallel resonant network structure and sensing module; The modulation element comprises a first port, a second port and a third port; wherein the first port of the modulation element is configured to receive a first microwave signal having a first frequency and output a frequency conversion signal having a second frequency; The first resonant network is electrically connected to the second port of the modulation element and is configured to converge the microwave signal output from the second port of the modulation element to obtain a second microwave signal; The parallel resonant network structure includes a first port and a second port; wherein the first port of the parallel resonant network structure is electrically connected to the third port of the modulation element, and the parallel resonant network structure includes a second resonant network and at least one third resonant network connected in parallel with the second resonant network, and is configured to generate an oscillation signal having a second resonant frequency according to a second microwave signal, and transmit the oscillation signal to the modulation element; The sensing module is electrically connected to the second port of the parallel resonant network structure.

2. The wireless sensor device according to claim 1, characterized in that: Also includes: Matching network; The matching network includes a first matching network arranged between the first port of the modulation element and the antenna, and / or a second matching network arranged between the second port of the modulation element and the first resonant network.

3. The wireless sensor device according to claim 1, characterized in that: The second resonant network and / or the third resonant network are configured as passive piezoelectric resonant networks; or, the second resonant network and the third resonant network are configured to be the same; or, the second resonant network and the third resonant network are configured to have the same impedance characteristics and the same or different impedance values.

4. The wireless sensor device according to claim 1, characterized in that: The modulation element is configured as a transistor having a heterojunction.

5. The wireless sensor device according to claim 4, characterized in that: The drain of the transistor with the heterojunction is configured as the first port of the modulation element, the source of the transistor with the heterojunction is configured as the second port of the modulation element, and the gate of the transistor with the heterojunction is configured as the third port of the modulation element.

6. A wireless sensing method, applied to the wireless sensing device according to any one of claims 1 to 5, characterized in that: include: S1: Connect the first resonant network to the second port of the modulation element; S2: connecting the first port of the parallel resonant network structure to the third port of the modulation element, and connecting the second port of the parallel resonant network structure to the sensing module; Wherein, the parallel resonant network structure includes a second resonant network and at least one third resonant network connected in parallel with the second resonant network; S3: the first port of the modulation element inputs a first microwave signal having a first frequency; S4: The first port of the modulation element outputs a frequency conversion signal having a second frequency.

7. The wireless sensing method according to claim 6, characterized in that: The first port of the modulation element inputs a first microwave signal having a first frequency, specifically comprising: S31: a first port of the modulation element receives a first microwave signal of a first frequency, and a second port outputs a microwave signal obtained by dispersing energy of the first microwave signal; S32: The first resonant network re-converges the microwave signal after energy dispersion to obtain a second microwave signal, and the second microwave signal is fed into the parallel resonant network structure.

8. The wireless sensing method according to claim 6, characterized in that: The first port of the modulation element outputs a frequency conversion signal having a second frequency, specifically comprising: S41: the second resonant network in the parallel resonant network structure and at least one third resonant network connected in parallel with the second resonant network generate an oscillation signal of a second resonant frequency according to a second microwave signal; S42: The modulation element outputs a frequency conversion signal having a second frequency obtained by mixing the oscillation signal with the first microwave signal.

9. The wireless sensing method according to claim 6, characterized in that: The second resonant network and the third resonant network are configured to be identical; or, the second resonant network and the third resonant network are configured to have identical impedance characteristics and identical or different impedance values.

10. A wireless sensing system, characterized in that: include: Transceiver device; The wireless sensing device according to any one of claims 1 to 5; The transceiver device is configured to transmit a first microwave signal with a first frequency to the wireless sensor device, and receive a frequency conversion signal with a second frequency transmitted by the wireless sensor device.

11. A wireless sensing method, used in the wireless sensing system according to claim 10, characterized in that: include: S1: The transceiver generates a first microwave signal having a first frequency and sends the first microwave signal; S2: The wireless sensor device receives the first microwave signal and transmits back a frequency conversion signal having a second frequency; S3: The transceiver receives the frequency conversion signal and demodulates it to obtain the information it carries.

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