Transmit-receive separation type differential antenna

Abstract

The utility model provides a transmit-receive separation type differential antenna, which comprises a reference ground and a plane radiation source, and the plane radiation source is arranged in a state of being spaced from the reference ground and is provided with two transmitting feed points and at least one receiving feed point. A connecting line of the two transmitting feed points passes through a physical center point of the planar radiation source; wherein the receiving feed point and the two transmitting feed points are arranged orthogonally in a state that an included angle between a connecting line between the receiving feed point and a physical center point of the planar radiation source and a connecting line between the two transmitting feed points tends to 90 degrees within an error range of + / -15 degrees; wherein the planar radiation source is adapted to be differentially fed at the two emission feed points.

Description

Technical Field

[0001] The utility model relates to the field of microwave detection, in particular to a transmitting and receiving separated differential antenna. Background Art

[0002] With the development of Internet of Things technology, artificial intelligence, smart home, and smart security technology have higher and higher requirements for environmental detection, especially for the detection accuracy of human presence, movement, and micro-motion characteristics. Only by obtaining sufficiently stable detection results can we provide accurate judgment basis for smart terminal devices. Among them, radio technology, including microwave detection technology based on the principle of Doppler effect, as an important hub connecting people and objects, and objects and objects, has unique advantages in behavior detection and existence detection technology. It can detect active objects, such as human motion characteristics, movement characteristics, and micro-motion characteristics, and even human heartbeat and breathing characteristics without infringing on human privacy, and therefore has broad application prospects.

[0003] Furthermore, in the ISM frequency bands defined by ITU-R (ITU Radiocommunication Sector, International Telecommunication Union Radiocommunication Bureau) for use by institutions such as industry, science and medicine without authorization, the frequency bands used for microwave detection are mainly limited frequency band resources such as 2.4Ghz, 5.8Ghz, 10.525Ghz, 24.125Ghz, and corresponding microwave detectors need to comply with a certain transmission power (generally less than 1W) when using these frequency bands to reduce interference with other radio equipment. Although the definition and licensing of different frequency bands can regulate the use of radio frequency bands and reduce the probability of mutual interference between radio equipment in different frequency bands, under the limited frequency band resource license, with the rapid development of Internet of Things technology, the corresponding adjacent frequency band or the same frequency band The rapid increase in the coverage of radio usage, the problem of mutual interference between adjacent or same frequency bands is becoming increasingly serious, and with the people-oriented intelligent competition, the demand for accurate detection of human motion characteristics including breathing and even heartbeat movements is also rapidly increasing. Therefore, as one of the factors affecting the accuracy of the corresponding microwave detection module, anti-interference performance is difficult to maintain in the context of increasingly serious problems of mutual interference between radios, let alone improve it to meet the needs of accurate detection of human motion characteristics including breathing and even heartbeat movements.

[0004] Specifically, among the existing microwave detection modules, the microwave detection module with patch antenna structure design has more delicate feedback on human activities and is relatively popular. The corresponding feeding design is divided into a combined transmitting and receiving design and a separate transmitting and receiving design. Figure 1 As shown, Figure 1A structure of an existing microwave detection module with a combined transmitter and receiver design is illustrated, wherein the existing microwave detection module with a combined transmitter and receiver design comprises a reference ground 10P and a radiation source 20P, wherein the radiation source 20P comprises at least one radiation element 21P, wherein each radiation element 21P is spaced apart from the reference ground 10P in a state tending to be parallel, wherein each radiation element 21P is provided with only one feeding point 211P, wherein each radiation element 21P is fed at its feeding point 211P and interacts with the reference ground 10P to emit a signal corresponding to A microwave beam of the corresponding excitation signal frequency, and a reflected echo formed by receiving the microwave beam reflected by the corresponding object and transmitting an echo signal corresponding to the reflected echo frequency at the feeding point 211P, so as to subsequently generate a Doppler intermediate frequency signal corresponding to the frequency difference between the excitation signal and the echo signal by mixing detection based on the Doppler effect principle, and the Doppler intermediate frequency signal is the feedback of the activity of the corresponding object, wherein the number of the radiating elements 21P allowed to correspond to the number of the radiating elements 21P corresponding to the number of the radiating elements 21P corresponding to the number of the radiating elements 21P corresponding to the number of the radiating elements 21P corresponding to the number of the radiating elements 21P corresponding to the number of the radiating elements 21P corresponding to the number of the radiating elements 21P corresponding to the frequency difference between the excitation signal and the echo signal and ... Figure 1 It is set as one to adapt to the current trend of miniaturization, but on the one hand, an additional phase shift circuit needs to be set up to meet the phase requirement of the mixing processing of the excitation signal and the echo signal, which increases the cost and easily causes the layout of the existing microwave detection module with a combined transmitter and receiver design to be crowded, which is not conducive to its anti-interference performance. On the other hand, the influence between the excitation signal and the echo signal cannot be avoided, which is not conducive to the mixing processing of the excitation signal and the echo signal, which correspondingly reduces the accuracy and stability of the existing microwave detection module with a combined transmitter and receiver design.

[0005] In summary, it is difficult for current microwave detection modules to adapt to the current miniaturization trend while meeting the current detection accuracy requirements. Utility Model Content

[0006] One object of the utility model is to provide a separate transmit-receive differential antenna, wherein the separate transmit-receive differential antenna comprises a planar radiation source, wherein the planar radiation source is provided with two transmitting feed points and at least one receiving feed point, wherein the line connecting the two transmitting feed points passes through the physical center point of the planar radiation source, wherein the separate transmit-receive differential antenna is differentially fed by connecting the two transmitting feed points with excitation signals with a phase difference of 180°, so that the electromagnetic interference in the environment exists in the signal in the form of common mode interference and can be effectively suppressed, wherein the receiving feed point is connected with the planar radiation source by its connection with the planar radiation source. The angle between the physical center points of the planar radiation source and the line between the two transmitting feed points is close to 90° within an error range of ±15°, and the two transmitting feed points are arranged orthogonally, so that when the planar radiation source is fed by the two transmitting feed points and emits a corresponding detection beam, a reflected echo formed by the reflection of the detection beam by the corresponding object is received, and a corresponding echo signal is transmitted at the receiving feed point to be separated from the transmitting and receiving arrangement, so as to improve the transmitting and receiving isolation of the transmitting and receiving separation type differential antenna based on the orthogonal transmitting feed point and the receiving feed point.

[0007] Another object of the present utility model is to provide a separate transmit-receive differential antenna, wherein the planar radiation source is differentially fed so that electromagnetic interference in the environment exists in the signal in the form of common-mode interference and can be effectively suppressed, thereby improving the separate transmit-receive differential antenna's ability to effectively detect activity characteristics corresponding to human body movement, micro-motion, and breathing and heartbeat movements.

[0008] Another object of the utility model is to provide a separate transmit-receive differential antenna, wherein the planar radiator is differentially fed by connecting the excitation signals tending to be in opposite phases to the two transmitting feeding points, so that when the planar radiator is fed, a zero potential point of the planar radiator can be formed at the physical center point of the planar radiator, thereby facilitating suppression of polarization balance mismatch caused by shape design and processing errors of the planar radiator, and further improving the radiation efficiency of the separate transmit-receive differential antenna in a manner that balances and ensures the potential distribution intensity of the planar radiator in the fed state, and correspondingly improving the accuracy of the separate transmit-receive differential antenna.

[0009] Another object of the present utility model is to provide a separate transmit-receive differential antenna, wherein the planar radiation source is differentially fed by connecting the two transmitting feeding points to excitation signals that tend to be in opposite phases, so as to improve the symmetry of the radiation beam of the separate transmit-receive differential antenna based on the differential feeding of the planar radiation source, and to reduce the radiation back lobe of the separate transmit-receive differential antenna, which is correspondingly beneficial to reduce the motion interference, electromagnetic interference and self-excited interference generated based on the radiation back lobe, and further to improve the anti-interference performance of the separate transmit-receive differential antenna.

[0010] Another object of the present utility model is to provide a separate transmit-receive differential antenna, wherein the planar radiation originates from the two transmitting feed points being connected to excitation signals tending to be in opposite phases and being differentially fed, and the corresponding echo signal is transmitted based on the receiving feed point orthogonal to the two transmitting feed points, which is beneficial to improving the signal isolation between the excitation signal and the echo signal, and further beneficial to the subsequent mixing processing of the excitation signal and the echo signal, thereby improving the accuracy and stability of the detection results of the separate transmit-receive differential antenna.

[0011] Another object of the present utility model is to provide a separate transceiver differential antenna, wherein the planar radiation source is grounded at its physical center point, so as to reduce the loss of the separate transceiver differential antenna and help improve the transceiver efficiency and radiation gain based on the grounding setting of the zero potential point of the planar radiation source, improve the anti-interference performance of the separate transceiver differential antenna, and reduce the requirements for dimensional accuracy of the separate transceiver differential antenna in the mass production process, enhance the production tolerance of the separate transceiver differential antenna, and ensure product performance consistency.

[0012] Another object of the present utility model is to provide a separate transmit-receive differential antenna, wherein the planar radiation source is configured to have no sharp corners, which is beneficial to optimizing the uniform distribution of charges, avoiding charge accumulation in the sharp corners, and improving the electromagnetic wave energy radiation efficiency of the separate transmit-receive differential antenna.

[0013] Another object of the utility model is to provide a separate transmit-receive differential antenna, wherein the separate transmit-receive differential antenna comprises a microwave chip, the microwave chip having two differential feeding pins and a receiving pin, wherein the microwave chip is suitable for outputting two excitation signals with a phase difference of 180° at the two differential feeding pins, wherein the two transmitting feeding points of the planar radiation source are fed and connected to the two differential feeding pins, so as to be differentially fed in a state where the microwave chip outputs two excitation signals with a phase difference of 180° at the two differential feeding pins, wherein the receiving feeding point of the planar radiation source is fed and connected to the receiving pin to transmit an echo signal to the microwave chip, thereby simplifying the circuit structure of the separate transmit-receive differential antenna based on the setting that the microwave chip directly outputs two excitation signals with a phase difference of 180° at the two differential feeding pins.

[0014] Another object of the present utility model is to provide a separate transmit-receive differential antenna, wherein the midpoint of the line connecting the two transmit feed points is located at the physical center point of the planar radiation source, that is, when the line connecting the two transmit feed points of the planar radiation source passes through the physical center point of the planar radiation source, the two transmit feed points are symmetrical with respect to the physical center point of the planar radiation source, thereby ensuring that the zero potential point of the planar radiation source is formed at the physical center point of the planar radiation source, which is beneficial to further suppress the polarization balance mismatch caused by the shape design and processing errors of the planar radiation source, and further improve the radiation efficiency of the separate transmit-receive differential antenna in a manner that balances and ensures the potential distribution intensity of the planar radiation source in the fed state, and correspondingly improves the accuracy of the separate transmit-receive differential antenna.

[0015] Another object of the present utility model is to provide a separate transmit-receive differential antenna, wherein the planar radiation source is arranged symmetrically with respect to the line connecting the two transmitting feeding points, so that when the planar radiation source is fed with a differential signal with a phase difference of 180°, the polarization balance mismatch caused by the shape design of the planar radiation source is further suppressed, and the radiation efficiency of the separate transmit-receive differential antenna is improved in a manner that balances and ensures the intensity of the potential distribution of the planar radiation source when being fed, thereby correspondingly improving the accuracy of the detection results of the separate transmit-receive differential antenna.

[0016] Another object of the present utility model is to provide a separate transmit-receive differential antenna, wherein the number of the receiving feed points is set to two, the line between the two receiving feed points passes through the physical center point of the planar radiation source, and the midpoint of the line between the two receiving feed points is located at the physical center point of the planar radiation source, and the planar radiation source is differentially received and fed at the two receiving feed points, and receives two echo signals with a phase difference of approximately 180° based on the two receiving feed points.

[0017] According to one aspect of the present invention, the present invention provides a separate transmit-receive differential antenna, wherein the separate transmit-receive differential antenna comprises:

[0018] a reference ground; and

[0019] A planar radiation source, wherein the planar radiation source is arranged in a state spaced apart from the reference ground and has two transmitting feed points and at least one receiving feed point, wherein a line connecting the two transmitting feed points passes through a physical center point of the planar radiation source, and a line connecting the receiving feed point and the physical center point of the planar radiation source and a line connecting the two transmitting feed points tend to be perpendicular within an error range of ±15°.

[0020] In one embodiment, the midpoint of the line connecting the two transmitting feed points is located at the physical center point of the planar radiation source.

[0021] In one embodiment, the planar radiation source is arranged symmetrically with respect to a line connecting the two transmission feeding points.

[0022] In one embodiment, the number of the receiving feed points is set to two, the connection line between the two receiving feed points passes through the physical center point of the planar radiation source, and the two receiving feed points receive differential signals.

[0023] In one embodiment, the transmit-receive separation differential antenna includes an excitation source and a power division phase shifter, wherein the power division phase shifter has an input port and two output ports, wherein the input port is electrically connected to the excitation source, and the two output ports are electrically connected to the two transmitting feed points, respectively, wherein the excitation source is suitable for outputting an excitation signal when powered, and the power division phase shifter receives the excitation signal and performs power division phase shifting processing to output a differential signal with a phase difference approaching 180° at the two output ports.

[0024] In one embodiment, the transmit-receive separation differential antenna includes an excitation source and a balun, wherein the balun includes a first conductor and a second conductor, wherein the first conductor and the second conductor are coupled to each other, wherein the two transmitting feed points are electrically connected to one end of the first conductor and one end of the second conductor, respectively, the other end of the second conductor is electrically connected to the excitation source, and the other end of the first conductor is grounded, so that when the excitation source outputs an excitation signal, the balun outputs a differential signal with a phase difference of approximately 180° at the two transmitting feed points to differentially feed the planar radiation source.

[0025] In one embodiment, the transmit-receive separation differential antenna comprises a microwave chip having two differential feeding pins and at least one receiving pin, wherein the microwave chip is suitable for outputting two excitation signals with a phase difference of 180° at the two differential feeding pins, wherein the two transmitting feeding points of the planar radiation source are fed and connected to the two differential feeding pins, so as to be differentially fed in a state where the microwave chip outputs two excitation signals with a phase difference of 180° at the two differential feeding pins, wherein the receiving feeding point of the planar radiation source is fed and connected to the receiving pin.

[0026] In one embodiment, the transmit-receive separation differential antenna includes a microwave chip and a power division phase shifter, the microwave chip includes a transmitting pin and a receiving pin, the power division phase shifter has an input port and two output ports, the transmitting pin is electrically connected to the input port, the two output ports are electrically connected to the two transmitting feed points, and the receiving feed point is electrically connected to the receiving pin, wherein the microwave chip is suitable for outputting an excitation signal from the transmitting pin, the power division phase shifter is connected to the excitation signal and performs power division phase shifting processing to output a differential signal with a phase difference of approximately 180° at the two output ports.

[0027] In one embodiment, the planar radiation source includes a ground point disposed at its physical center point, and the planar radiation source is grounded via the ground point.

[0028] In one embodiment, wherein the planar radiation source comprises a plurality of grounding points arranged around a physical center point thereof, the planar radiation source is grounded via the grounding points.

[0029] In one embodiment, the planar radiation source has a shape formed by chamfering the four corners of a rectangle on the basis of a rectangle, and the corresponding planar radiation source has four straight edges arranged intermittently in a clockwise / counterclockwise direction, and four convex arc corners connected between any two of the straight edges adjacent in a clockwise / counterclockwise direction.

[0030] According to another aspect of the present invention, the present invention provides a separate transceiver differential antenna, wherein the separate transceiver differential antenna comprises:

[0031] As described above, the transmit-receive separation differential antenna, wherein the transmitting feed point and the receiving feed point of the transmit-receive separation differential antenna are reciprocally arranged, then the corresponding planar radiation originates from the receiving feed point receiving the excitation signal and being transmitted and fed, and from the transmitting feed point transmitting the echo signal and being received and fed.

[0032] Through understanding of the following description and drawings, further objects and advantages of the present utility model will be fully reflected. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The schematic diagram is a structural diagram of an existing microwave detection module that adopts a transmitting-receiving integrated design.

[0034] Figure 2A FIG. 4 is a schematic structural diagram of a separate transmitting and receiving differential antenna according to an embodiment of the present invention.

[0035] Figure 2B 1 is a radiation pattern of the structure of the separate transmit / receive differential antenna according to the embodiment of the present invention.

[0036] Figure 2C The two-dimensional radiation pattern of the structure of the separate transmit / receive differential antenna according to the embodiment of the present invention is shown in FIG.

[0037] Figure 2D 1 is an S11-S12 curve of the structure of the separate transmit-receive differential antenna according to the embodiment of the present invention.

[0038] Figure 3A It is a schematic structural diagram of an optional feeding structure of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0039] Figure 3B It is a schematic structural diagram of an optional feeding structure of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0040] Figure 3C It is a schematic structural diagram of an optional feeding structure of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0041] Figure 3D It is a schematic structural diagram of an optional feeding structure of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0042] Figure 4 Schematic diagram of a modified structure of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0043] Figure 5 Schematic diagram of a modified structure of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0044] Figure 6 Schematic diagram of a modified structure of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0045] Figure 7 Schematic diagram of a modified structure of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0046] Fig. 8A It is a schematic diagram of an optional form of a planar radiation source of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0047] Figure 8B It is a schematic diagram of an optional form of a planar radiation source of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0048] Figure 8C It is a schematic diagram of an optional form of a planar radiation source of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0049] Fig.8D It is a schematic diagram of an optional form of a planar radiation source of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0050] Fig. 8E It is a schematic diagram of an optional form of a planar radiation source of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0051] Figure 8F It is a schematic diagram of an optional form of a planar radiation source of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0052] Figure 8G It is a schematic diagram of an optional form of a planar radiation source of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0053] Fig. 9A Schematic diagram of a layout of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0054] Fig. 9B Schematic diagram of a layout of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0055] Fig. 9C Schematic diagram of a layout of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0056] Fig.9D Schematic diagram of a layout of the separate transmit-receive differential antenna according to the above embodiment of the utility model.

[0057] Fig.9E Schematic diagram of a layout of the separate transmit-receive differential antenna according to the above embodiment of the utility model. DETAILED DESCRIPTION

[0058] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0059] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0060] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0061] Referring to the drawings of the specification of the utility model FIG. 2A to FIG. 2D , the structure of a transmit-receive separation differential antenna according to an embodiment of the utility model and the corresponding simulation results are illustrated, wherein the transmit-receive separation differential antenna comprises a planar radiation source 11 and a reference ground 12, wherein the planar radiation source 11 and the reference ground 12 are arranged at intervals, wherein the planar radiation source 11 is arranged to have two transmitting feeding points 111 and at least one receiving feeding point 112, wherein the line connecting the two transmitting feeding points 111 passes through the physical center point of the planar radiation source 11, wherein the transmit-receive separation differential antenna is differentially fed by connecting the excitation signals with a phase difference of 180° to the two transmitting feeding points 111, wherein the receiving feeding point 112 is connected to the receiving feeding point 111. 12 is arranged orthogonally with the two transmitting feed points 111 in a state where the angle between the line connecting the physical center point of the planar radiation source 11 and the line connecting the two transmitting feed points 111 tends to 90° within an error range of ±15°, so that when the planar radiation source 11 is fed at the two transmitting feed points 111 and emits a corresponding detection beam, it receives a reflected echo formed by the reflection of the detection beam by the corresponding object, and transmits the corresponding echo signal at the receiving feed point 112 to be arranged for transmission and reception separation, so as to improve the transmission and reception isolation of the transmit-receive separation type differential antenna based on the orthogonal transmission and reception separation setting of the transmitting and receiving feed points 111 and the receiving and feeding points 112.

[0062] In particular, the planar radiation source 11 is differentially fed by connecting excitation signals tending to be in opposite phases at the two transmitting feeding points 111, so that when the planar radiation source 11 is fed, a zero potential point of the planar radiation source 11 can be formed at the physical center point of the planar radiation source 11, which is beneficial to suppressing the polarization balance mismatch caused by the shape design and processing errors of the planar radiation source 11, and further improving the radiation efficiency of the transmit-receive separation differential antenna in a manner that balances and ensures the potential distribution intensity of the planar radiation source 11 in the fed state, and correspondingly improves the accuracy of the transmit-receive separation differential antenna.

[0063] It is worth mentioning that the planar radiation source 11 is differentially fed by connecting the excitation signals tending to be in opposite phases at the two transmitting feeding points 111, so as to feed the planar radiation source 11 differentially. Specifically, referring to Figure 2B and Figure 2C The radiation pattern corresponding to the transmit-receive separation type differential antenna is illustrated. The radiation beam of the transmit-receive separation type differential antenna shows good symmetry and tends to be circular, which is beneficial to ensuring the coverage of the corresponding detection area by the transmit-receive separation type differential antenna. At the same time, the radiation back lobe of the transmit-receive separation type differential antenna is small, which is beneficial to reducing the motion interference, electromagnetic interference and self-excited interference generated by the radiation back lobe, and thus is beneficial to improving the anti-interference performance of the transmit-receive separation type differential antenna.

[0064] In particular, the planar radiation source 11 is differentially fed by connecting the excitation signals tending to be in anti-phase at the two transmitting feed points 111, and transmitting the corresponding echo signal based on the receiving feed point 112 orthogonal to the two transmitting feed points 111, which is beneficial to improving the signal isolation between the excitation signal and the echo signal of the transmit-receive separation differential antenna, and further beneficial to the subsequent mixing processing of the excitation signal and the echo signal, thereby improving the accuracy and stability of the detection results of the transmit-receive separation differential antenna.

[0065] Preferably, the midpoint of the line connecting the two transmitting feed points 111 is located at the physical center point of the planar radiation source 11, that is, when the line connecting the two transmitting feed points 111 of the planar radiation source 11 passes through the physical center point of the planar radiation source 11, the two transmitting feed points 111 are symmetrical with respect to the physical center point of the planar radiation source 11, thereby ensuring that the zero potential point of the planar radiation source 11 is formed at the physical center point of the planar radiation source 11, which is beneficial to further suppress the polarization balance mismatch caused by the shape design and processing errors of the planar radiation source 11, and further improve the radiation efficiency of the transmit-receive separation type differential antenna in a manner that balances and ensures the potential distribution intensity of the planar radiation source 11 in the fed state, and correspondingly improves the accuracy of the transmit-receive separation type differential antenna.

[0066] Preferably, the planar radiation source 11 is arranged symmetrically with respect to the line connecting the two transmitting feeding points 111, so that when the planar radiation source 11 is fed with a differential signal with a phase difference of approximately 180°, the polarization balance mismatch caused by the shape design of the planar radiation source 11 is further suppressed, thereby balancing and ensuring the intensity of the potential distribution of the planar radiation source 11 in the fed state, thereby improving the radiation efficiency of the transmit-receive separation differential antenna and correspondingly improving the accuracy of the detection results of the transmit-receive separation differential antenna.

[0067] Further, refer to FIG. 3A to FIG. 3D Corresponding to the requirement that the planar radiation source 11 is connected to the two transmitting feeding points 111 with differential signals of opposite phases, some corresponding optional feeding structures are illustrated.

[0068] Corresponds to Figure 3A , wherein the transmit-receive separation differential antenna comprises an excitation source 21 and a power division phase shifter 22, wherein the power division phase shifter 22 has an input port 221 and two output ports 222, wherein the input port 221 is electrically connected to the excitation source 21, and the two output ports 222 are respectively electrically connected to the two transmitting feed points 111, wherein the excitation source 21 is suitable for outputting an excitation signal in a powered state, and the power division phase shifter 22 receives the excitation signal and performs power division phase shifting processing to output a differential signal with a phase difference of 180° at the two output ports 222, thereby differentially feeding the planar radiation source 11 at the two transmitting feed points 111.

[0069] Corresponds to Figure 3B, wherein the transmit-receive separation differential antenna comprises the excitation source 21 and a balun 23, wherein the balun 23 comprises a first conductor 231 and a second conductor 232 arranged in the form of a strip coupling line, wherein the first conductor 231 and the second conductor 232 are coupled to each other, wherein the two transmitting feeding points 111 are respectively electrically connected to one end of the first conductor 231 and one end of the second conductor 232, the other end of the second conductor 232 is electrically connected to the excitation source 21, and the other end of the first conductor 231 is grounded, so that when the excitation source 21 outputs an excitation signal, the balun 23 outputs a differential signal with a phase difference of 180° at the two transmitting feeding points 111 to differentially feed the planar radiation source 11.

[0070] Corresponds to Figure 3C ,based on Figure 3B A deformed structure balun 23A of the balun 23 is shown schematically, wherein the transmit-receive separation differential antenna includes the excitation source 21 and the balun 23A, wherein the balun 23A includes a first conductor 231A and a second conductor 232A, the first conductor 231A and the second conductor 232A are arranged in the form of coil windings, the first conductor 231A and the second conductor 232A are coupled to each other, wherein the two transmitting feeding points 111 are respectively electrically connected to one end of the first conductor 231A and one end of the second conductor 232A, the other end of the second conductor 232A is electrically connected to the excitation source 21, and the other end of the first conductor 231A is grounded, so that when the excitation source 21 outputs an excitation signal, the balun 23A outputs a differential signal with a phase difference of 180° at the two transmitting feeding points 111 to differentially feed the planar radiation source 11.

[0071] Corresponds to Figure 3D , wherein the transmit-receive separation differential antenna comprises a microwave chip 24, wherein the microwave chip 24 has two differential feeding pins 241 and at least one receiving pin 242, wherein the microwave chip 24 is suitable for outputting two excitation signals with a phase difference of 180° at the two differential feeding pins 241, wherein the two transmitting feeding points 111 of the planar radiation source 11 are fed and connected to the two differential feeding pins 241, so as to be differentially fed in a state where the microwave chip 24 outputs two excitation signals with a phase difference of 180° at the two differential feeding pins 241, wherein the receiving feeding point 112 of the planar radiation source 11 is fed and connected to the receiving pin 242, so as to transmit the echo signal to the microwave chip, thereby improving the circuit integration of the transmit-receive separation differential antenna and simplifying the circuit structure of the transmit-receive separation differential antenna based on the setting that the microwave chip 24 directly outputs two excitation signals with a phase difference of 180° at the two differential feeding pins 241.

[0072] It is worth mentioning that in this structure of the present invention, the planar radiation source 11 is grounded at its physical center point, so as to reduce the loss of the transmit-receive separation type differential antenna and help improve the transmit-receive efficiency and radiation gain based on the grounding setting of the zero potential point of the planar radiation source 11, thereby improving the anti-interference performance of the transmit-receive separation type differential antenna, and reducing the requirements for dimensional accuracy of the transmit-receive separation type differential antenna in the mass production process, thereby enhancing the production tolerance of the transmit-receive separation type differential antenna and ensuring product performance consistency.

[0073] Specifically, the planar radiation source 11 includes a grounding point 110, wherein the grounding point 110 is disposed at the physical center point of the planar radiation source 11 and is electrically connected to the reference ground 12 to ground the planar radiation source 11 at its physical center point.

[0074] Further, referring to the drawings of the specification of the utility model Figure 4 As shown, a deformed structure based on the grounding setting of the planar radiation source 11 is illustrated. In this deformed structure, the planar radiation source 11 includes a plurality of grounding points 110, and the plurality of grounding points 110 are arranged around the physical center point of the planar radiation source 11 to equivalently form a state in which the planar radiation source 11 is grounded at its physical center point.

[0075] Further, referring to the drawings of the specification of the utility model Figure 5 In the state where the planar radiation source 11 is grounded with a plurality of the grounding points 110 around its physical center point, the planar radiation source 11 further includes a grounding point 110 arranged at its physical center point.

[0076] Preferably, the planar radiation source 11 is configured to have no sharp corners, which is beneficial to optimizing the uniform distribution of charges, avoiding charge accumulation in the sharp corners, and improving the electromagnetic wave energy radiation efficiency of the transmit-receive separation differential antenna.

[0077] Specifically, the planar radiation source 11 has a shape formed by chamfering the four corners of a rectangle on the basis of a rectangle, and the corresponding planar radiation source 11 has four straight sides 113 arranged intermittently in a clockwise / counterclockwise direction, and four convex arc corners 114 connected between any two of the straight sides 113 adjacent in a clockwise / counterclockwise direction, so as to avoid charge accumulation in the sharp corner area based on the non-sharp corner area formed by the convex arc corners 114, thereby improving the electromagnetic wave energy radiation efficiency of the planar radiation source 11.

[0078] It is worth mentioning that, corresponding to the above structure of the present invention, the two transmitting feeding points 111 are arranged in a state where the extension line of the line between the two passes through the straight edge 113 of the planar radiation source 11. Figure 6 The two transmitting feeding points 111 are arranged in a state where the extension line of the line between the two passes through the convex arc corner 114 of the planar radiation source 11.

[0079] Further, the utility model is a Figure 7 The number of the receiving feeding points 112 of the planar radiation source 11 is set to two, and the line between the two receiving feeding points 112 passes through the physical center point of the planar radiation source 11. The planar radiation source 11 is differentially received and fed at the two receiving feeding points 112, and two echo signals with a phase difference of approximately 180° are received based on the two receiving feeding points 112.

[0080] Corresponding to Figure 7 In the structure shown, the midpoint of the line connecting the two receiving feed points 112 is located at the physical center point of the planar radiation source 11, that is, in the state where the line connecting the two receiving feed points 112 of the planar radiation source 11 passes through the physical center point of the planar radiation source 11, the two receiving feed points 112 are symmetrical about the physical center point of the planar radiation source 11. And preferably, the planar radiation source 11 is also symmetrical about the line connecting the two receiving feed points 112 to balance and ensure the potential distribution intensity of the planar radiation source 11 in the fed state.

[0081] In particular, based on the reciprocity of transmission and reception, the transmitting feed point 111 and the receiving feed point 112 can be reciprocally set, that is, the corresponding planar radiation source 11 receives the excitation signal at the receiving feed point 112 and is transmitted and fed, and transmits the echo signal at the transmitting feed point 111 and is received and fed.

[0082] It is worth mentioning that the planar radiation source 11 is differentially received and fed at the two transmitting feeding points 111 to access the differential signal, so that the electromagnetic interference in the environment exists in the signal in the form of common mode interference and can be effectively suppressed, thereby improving the effectiveness of the separate transmit and receive differential antenna in detecting the activity characteristics corresponding to human body movement, micro-motion, breathing and heartbeat movements.

[0083] Further, based on the disclosure of the present invention, in some embodiments of the present invention, the planar radiation source 11 may also be arranged in other forms, and the present invention does not limit this. FIG. 8A to FIG. 8G , some optional forms of the planar radiation source 11 are illustrated.

[0084] Corresponds to Fig. 8A , wherein the planar radiation source 11 is arranged in a rectangular shape and has two long sides and two short sides connected to the two long sides, and the extension line of the connection line between the two transmitting feeding points 111 is perpendicular to the two long sides.

[0085] Corresponds to Figure 8B , wherein the planar radiation source 11 is arranged in a square shape, and the extension line of the line connecting the two transmitting feeding points 111 passes through the diagonal of the planar radiation source 11.

[0086] Corresponds to Figure 8C , wherein the planar radiation source 11 is arranged in an octagonal shape, and the eight sides of the planar radiation source 11 are equal in length.

[0087] Corresponds to Fig.8D , wherein the planar radiation source 11 is designed with a cut corner on a rectangular basic form and has a concave edge in a broken line form, and an extension line of the line connecting the two transmitting feeding points 111 passes through the concave edge of the planar radiation source 11.

[0088] Corresponds to Fig. 8E , wherein the edge of the planar radiation source 11 is an even number of arc edges connected end to end, that is, the planar radiation source 11 is a structural form formed by an even number of arc edges connected end to end. In this structure, the outer arc of the arc edge faces the physical center point of the planar radiation source 11.

[0089] Corresponds to Figure 8F , wherein the edge of the planar radiation source 11 is an even number of arc edges connected end to end, that is, the planar radiation source 11 is a structural form formed by an even number of arc edges connected end to end. In this structure, the outer arc of the arc edge faces away from the physical center point of the planar radiation source 11.

[0090] Corresponds to Figure 8G , wherein the planar radiation source 11 is designed with a cut corner on a rectangular basic shape and has an arc-shaped concave edge, and the extension line of the line connecting the two transmitting feeding points 111 passes through the concave edge of the planar radiation source 11.

[0091] Further, referring to the drawings of the specification of the utility model 9A to 9E , some layout forms of the separate transmit-receive differential antenna are illustrated. In these examples, the planar radiation source 11 and the microwave chip are carried on different surfaces of the corresponding plate.

[0092] Corresponds to Fig. 9AThe two transmitting feeding points 111 are arranged in a state where the extension line of the connecting line therebetween passes through the straight edge 113 of the planar radiation source 11, and the transmitting and receiving separated differential antenna uses the microwave chip for feeding.

[0093] Corresponds to Fig. 9B The two transmitting feeding points 111 are arranged in a state where the extension line of the connecting line therebetween passes through the convex arc corner 114 of the planar radiation source 11, and the transmitting and receiving separated differential antenna uses the microwave chip for feeding.

[0094] It is worth mentioning that the two transmitting feed points 111 and the receiving feed points 112 can be reciprocally set, corresponding to the planar radiation source 11 receiving the excitation signal at the receiving feed point 112 to be transmitted and fed, and transmitting the echo signal at the two transmitting feed points 111 to be received and fed.

[0095] Corresponds to Fig. 9C The planar radiation source 11 includes two transmitting feeding points 111 and two receiving feeding points 112. The two transmitting feeding points 111 are arranged in a state where the extension line of the connecting line therebetween passes through the straight edge 113 of the planar radiation source 11. The transmit-receive separation differential antenna uses the microwave chip for feeding.

[0096] Corresponds to Fig.9D The planar radiation source 11 includes two transmitting feeding points 111 and two receiving feeding points 112. The two transmitting feeding points 111 are arranged in a state where the extension line of the connecting line therebetween passes through the convex arc corner 114 of the planar radiation source 11. The transmit-receive separation differential antenna uses the microwave chip for feeding.

[0097] Corresponds to Fig.9E The two transmitting feed points 111 are arranged in a state where the extension line of the connection between the two passes through the straight edge 113 of the planar radiation source 11. The transmit-receive separation differential antenna is fed by a combination of a microwave chip and a power division phase shifter. Specifically, the microwave chip includes a transmitting pin and a receiving pin, and the power division phase shifter has an input port and two output ports. The transmitting pin is electrically connected to the input port, and the two output ports are electrically connected to the two transmitting feed points 111. The receiving feed point 112 is electrically connected to the receiving pin, wherein the microwave chip is suitable for outputting an excitation signal from the transmitting pin, and the power division phase shifter is connected to the excitation signal and performs power division phase shifting processing to output a differential signal with a phase difference of 180° at the two output ports to differentially feed the planar radiation source 11.

[0098] It can be understood that in these examples of the present invention, the planar radiation source 11 is fed with a probe feeding structure, but this does not constitute a limitation of the present invention. In some embodiments of the present invention, the planar radiation source 11 can also be fed with a microstrip feeding structure, an edge feeding structure, a corner feeding structure, etc., and the present invention does not impose any limitation on this.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0100] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. Transmitter-receiver separation differential antenna, It is characterized in that include: - reference ground; and A planar radiation source, wherein the planar radiation source is arranged in a state spaced apart from the reference ground and has two transmitting feed points and at least one receiving feed point, wherein a line connecting the two transmitting feed points passes through a physical center point of the planar radiation source, and a line connecting the receiving feed point and the physical center point of the planar radiation source and a line connecting the two transmitting feed points tend to be perpendicular within an error range of ±15°.

2. The transmit-receive separated differential antenna according to claim 1, wherein the midpoint of the line connecting the two transmitting feed points is located at the physical center point of the planar radiation source.

3. The transmit-receive separated differential antenna according to claim 2, wherein the planar radiation source is arranged symmetrically with respect to a line connecting the two transmitting feed points.

4. The transmit-receive separated differential antenna according to claim 1, wherein the number of the receiving feed points is set to two, the connection line between the two receiving feed points passes through the physical center point of the planar radiation source, and the two receiving feed points receive differential signals.

5. The transmit-receive separated differential antenna according to claim 1, wherein the transmit-receive separated differential antenna comprises an excitation source and a power division phase shifter, wherein the power division phase shifter has an input port and two output ports, wherein the input port is electrically connected to the excitation source, and the two output ports are electrically connected to the two transmitting feeding points respectively, wherein the excitation source is suitable for outputting an excitation signal when powered, and the power division phase shifter receives the excitation signal and performs power division phase shifting processing to output a differential signal with a phase difference approaching 180° at the two output ports.

6. The transmit-receive separated differential antenna according to claim 1, wherein the transmit-receive separated differential antenna comprises an excitation source and a balun, wherein the balun comprises a first conductor and a second conductor, wherein the first conductor and the second conductor are coupled to each other, wherein the two transmitting feed points are electrically connected to one end of the first conductor and one end of the second conductor respectively, the other end of the second conductor is electrically connected to the excitation source, and the other end of the first conductor is grounded, so that when the excitation source outputs an excitation signal, the balun outputs a differential signal with a phase difference of 180° at the two transmitting feed points to differentially feed the planar radiation source.

7. A transmit-receive separated differential antenna according to claim 1, wherein the transmit-receive separated differential antenna comprises a microwave chip, the microwave chip having two differential feeding pins and at least one receiving pin, wherein the microwave chip is suitable for outputting two excitation signals with a phase difference of 180° at the two differential feeding pins, wherein the two transmitting feeding points of the planar radiation source are fed and connected to the two differential feeding pins, so as to be differentially fed in a state where the microwave chip outputs two excitation signals with a phase difference of 180° at the two differential feeding pins, wherein the receiving feeding point of the planar radiation source is fed and connected to the receiving pin.

8. According to claim 1, the transmit-receive separated differential antenna comprises a microwave chip and a power division phase shifter, the microwave chip comprises a transmitting pin and a receiving pin, the power division phase shifter has an input port and two output ports, the transmitting pin is electrically connected to the input port, the two output ports are electrically connected to the two transmitting feed points, and the receiving feed point is electrically connected to the receiving pin, wherein the microwave chip is suitable for outputting an excitation signal from the transmitting pin, the power division phase shifter is connected to the excitation signal and performs power division phase shifting processing to output a differential signal with a phase difference of approximately 180° at the two output ports. 9 . The transmit-receive separated differential antenna according to claim 1 , wherein the planar radiation source comprises a ground point arranged at a physical center point thereof, and the planar radiation source is grounded via the ground point. 10 . The transmit-receive separation type differential antenna according to claim 1 , wherein the planar radiation source comprises a plurality of grounding points arranged around a physical center point thereof, and the planar radiation source is grounded from the grounding points.

11. The transmit-receive separation differential antenna according to any one of claims 1 to 10, wherein the planar radiation source has a shape formed by chamfering the four corners of a rectangle on the basis of a rectangle, and the corresponding planar radiation source has four straight sides arranged intermittently in a clockwise / counterclockwise direction, and four convex arc corners connected between any two of the straight sides adjacent in a clockwise / counterclockwise direction.

12. Transmitter-receiver separation differential antenna, It is characterized in that include: The transmit-receive separation differential antenna as described in any one of claims 1 to 3, 5 to 11, wherein the transmit feed point and the receive feed point of the transmit-receive separation differential antenna are reciprocally arranged, and the corresponding planar radiation originates from the receive feed point receiving an excitation signal and being transmitted and fed, and from the transmit feed point transmitting an echo signal and being received and fed.

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