A microwave Doppler detection antenna and a manufacturing method thereof

Abstract

The present invention provides a microwave Doppler detection antenna and a manufacturing method thereof, wherein the microwave Doppler detection antenna adopts a planar radiation source structure and includes at least one radiation element and a reference ground spaced apart from the radiation element, and a radiation source substrate arranged between the radiation element and the reference ground to form a state in which the radiation element and the reference ground are spaced apart. By adopting a material with a dielectric constant greater than or equal to 7 as the radiation source substrate and combining the thickness of the radiation source substrate to be greater than or equal to λ / 32 within an error range of 10%, the minimum area size bottleneck of the radiation element is reduced, which is beneficial to reducing the size of the microwave Doppler detection antenna, and at the same time can ensure the radiation gain of the microwave Doppler detection antenna.

Description

Technical Field

[0001] The invention relates to the field of Doppler microwave detection, and in particular to a microwave Doppler detection antenna and a manufacturing method thereof. Background Art

[0002] Wireless communication technology, which uses electromagnetic waves as information carriers, is an important symbol of the development of modern science. Since its birth, it has developed rapidly and has been widely used in production, life and military, such as satellite communication systems, satellite navigation systems, remote control systems and daily RFID identification systems. Antennas, as the basic hardware for transmitting and receiving electromagnetic waves, have different structural and index characteristic requirements when they are applied to different fields. Specifically, in the field of Doppler microwave detection, a microwave Doppler detection antenna based on the Doppler effect principle transmits a microwave beam and receives a reflected echo formed by the microwave beam being reflected by a corresponding object, and then generates a Doppler intermediate frequency signal corresponding to the frequency difference between the microwave beam and the reflected echo by mixing detection based on the Doppler effect principle, so as to feedback the movement of the corresponding object with the Doppler intermediate frequency signal. 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, and the requirements for radiation gain in the index characteristics of microwave Doppler detection antennas are improved.

[0003] That is to say, the microwave Doppler detection antenna based on the Doppler effect principle needs to have both transmitting and receiving functions, and has high requirements for the radiation gain in the transmitting state. Specifically, the existing microwave Doppler detection antenna mainly adopts a columnar radiation source structure and a planar radiation source structure, and adopts a transmitting and receiving integrated design based on the miniaturization trend. The microwave Doppler detection antenna with a columnar radiation source structure has a radiation dead zone and has poor applicability compared to the microwave Doppler detection antenna with a planar radiation source structure. The existing microwave Doppler detection antenna mostly adopts a planar radiation source structure. Figure 1A and Figure 1BAs shown, the structural principle of the existing microwave Doppler detection antenna with a planar radiation source structure adopting a transmitting-receiving integrated design is schematically illustrated, wherein the microwave Doppler detection antenna includes a reference ground 10P and a radiation source 20P, wherein the radiation source 20P includes 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 by a radiation source substrate 30P, wherein each radiation element 21P is provided with and has only one feeding point 211P, wherein in the state where each radiation element 21P is fed at its feeding point 211P, the radiation element 21P is coupled with the reference ground 10P to establish an internal electric field and a fringe electric field between the radiation element 21P and the reference ground 10P with the edge of the radiation element 21P as the boundary, then the internal electric field is an electric field established in a direction perpendicular to both the radiation element 21P and the reference ground 10P, and the fringe electric field is an electric field established in a direction not perpendicular to both the radiation element 21P and the reference ground 10P. The electric field is established in the direction of the radiation element 21P and the reference ground 10, wherein based on the alternating propagation of the electric field and the magnetic field, the fringe electric field can form a radiation near field and further form a radiation far field to form the emission of the microwave beam, that is, the energy of the fringe electric field is the basis of the radiation energy of the microwave Doppler detection antenna and is directly related to the radiation gain of the microwave Doppler detection antenna. In order to ensure the energy of the fringe electric field, the existing microwave Doppler detection antenna generally adopts the radiation source substrate 30P with a dielectric constant lower than 3.5 to reduce the energy of the internal electric field, and ensures the formation of the electric field between the radiation element 21P and the reference ground 10P by limiting the thickness of the radiation source substrate 30P to be less than or equal to 1 mm to produce an initial polarization direction, and reduces the dielectric loss between the radiation element 21P and the reference ground 10P, thereby ensuring the radiation gain of the microwave Doppler detection antenna.

[0004] However, when the radiation source substrate 30P is configured to use a material with a dielectric constant lower than 3.5, in order to achieve the operating frequency of the microwave Doppler detection antenna, such as the operating frequency of the 5.8G frequency band, the radiation element 21P must have a larger area. Specifically, taking a high-frequency PCB substrate with a dielectric constant of 3.5 and a thickness of 1.0 mm as an example of the radiation source substrate 30P, in order to achieve the operating frequency of the 5.8GHz frequency band, the size of the radiation element 21P is about 13mm*18mm. On the one hand, due to the structural stability of the existing high-frequency PCB substrate and the original structure of double-sided copper cladding, the size of the radiation source substrate 30P is often larger than the size of the radiation element 21P, which causes the problem that the size of the existing microwave Doppler detection antenna is difficult to reduce and the waste problem in the manufacturing process; on the other hand, the size of the reference ground 10P must also meet the requirement of being larger than the size of the radiation element 21P, that is, the minimum size bottleneck of the radiation element 21P is the bottleneck limit of the size of the existing microwave Doppler detection antenna. Only when the minimum size bottleneck of the radiation element 21P is reduced, the size of the existing microwave Doppler detection antenna can be reduced. Summary of the invention

[0005] One object of the present invention is to provide a microwave Doppler detection antenna and a method for manufacturing the same, wherein the microwave Doppler detection antenna adopts a planar radiation source structure and includes at least one radiation element and a reference ground spaced apart from the radiation element, and a radiation source substrate disposed between the radiation element and the reference ground to form a state in which the radiation element and the reference ground are spaced apart, wherein by adopting a material with a dielectric constant greater than or equal to 7 as the radiation source substrate, the minimum area size bottleneck of the radiation element is reduced, which is beneficial to reducing the size of the microwave Doppler detection antenna, and by setting the thickness of the radiation source substrate to be greater than or equal to λ / 32 within an error range of 10%, the dielectric constant of the radiation source substrate is greater than or equal to λ / 32. The inhibitory effect of the edge electric field caused by the enhancement of the internal electric field due to the increase in the dielectric constant can be reduced, thereby ensuring the energy of the edge electric field of the microwave Doppler detection antenna in the fed state, and correspondingly ensuring the radiation gain of the microwave Doppler detection antenna, wherein λ is a wavelength parameter corresponding to the frequency parameter of the microwave Doppler detection antenna, that is, by using a material with a dielectric constant greater than or equal to 7 as the radiation source substrate, and setting the thickness of the radiation source substrate greater than or equal to λ / 32 within an error range of 10%, the bottleneck of the minimum area size of the radiation element is reduced, which is beneficial to reducing the size of the microwave Doppler detection antenna, and at the same time can ensure the radiation gain of the microwave Doppler detection antenna.

[0006] Another object of the present invention is to provide a microwave Doppler detection antenna and a method for manufacturing the same, wherein the microwave Doppler detection module's ability to receive weak electromagnetic wave signals is enhanced by increasing the thickness of the radiation source substrate to greater than or equal to λ / 32 within an error range of 10%, and the accuracy of the microwave Doppler detection antenna in detecting weak movements is correspondingly improved, so that the microwave Doppler detection antenna is suitable for detecting weak movements such as human movement, micro-movement, breathing and heartbeat, and is used for human presence detection.

[0007] Another object of the present invention is to provide a microwave Doppler detection antenna and a manufacturing method thereof, wherein the radiating element is equivalent to an electrical feeding point, wherein the direction of a line connecting the electrical feeding point of the radiating element to the physical center point of the radiating element is the polarization direction of the radiating element, wherein in the polarization direction of the radiating element, the edge of the radiation source substrate is set within an error range of λ / 128 to be aligned with the edge of the radiating element, so as to reduce the absorption of the energy of the edge electric field by the radiation source substrate, thereby ensuring the radiation gain of the microwave Doppler detection antenna in a manner that ensures the energy size of the edge electric field.

[0008] Another object of the present invention is to provide a microwave Doppler detection antenna and a method for manufacturing the same, wherein in the polarization direction of the radiation element, the edge of the radiation source substrate is set to be aligned with the edge of the radiation element within an error range of λ / 128, so that the size of the radiation source substrate can be reduced because the bottleneck of the minimum area size of the radiation element is reduced. At the same time, the radiation source substrate has a plate area close to that of the radiation element, which is beneficial to reducing the waste of the radiation source substrate plate and / or the waste of the radiation element during the production process of the microwave Doppler detection antenna, thereby helping to improve the economic benefits of the microwave Doppler detection antenna.

[0009] Another object of the present invention is to provide a microwave Doppler detection antenna and a method for manufacturing the same, wherein the distance between the electrical feeding point and the physical center point of the radiating element is greater than or equal to λ / 128, so as to help reduce the microwave Doppler detection antenna's requirements for the strength of the corresponding excitation signal, so that when the radiating element is fed by the corresponding excitation signal at the electrical feeding point, the microwave Doppler detection antenna is more likely to generate an initial polarization direction.

[0010] Another object of the present invention is to provide a microwave Doppler detection antenna and a manufacturing method thereof, wherein the microwave Doppler detection antenna further includes a feed source, wherein the feed source is configured to allow power to be supplied and output at least one excitation signal with the positive pole or ground of the corresponding power supply as a reference ground pole, wherein a straight line on the radiating element passing through the physical center point of the radiating element and perpendicular to the polarization direction of the radiating element is the zero potential line of the radiating element, and when the radiating element is fed by the excitation signal connected to the electrical feeding point, the radiating element is electrically connected to the reference ground pole at the zero potential line, thereby reducing the impedance of the microwave Doppler detection antenna at a frequency deviating from the resonant operating point, correspondingly narrowing the frequency bandwidth of the microwave Doppler detection antenna and facilitating improving the anti-interference performance of the microwave Doppler detection antenna.

[0011] Another object of the present invention is to provide a microwave Doppler detection antenna and a method for manufacturing the same, wherein the impedance of the microwave Doppler detection antenna at a frequency deviating from the resonant operating point is reduced, and the corresponding frequency bandwidth of the microwave Doppler detection antenna is narrowed, that is, the quality factor of the microwave Doppler detection antenna is improved and the reception of signals outside the resonant frequency by the microwave Doppler detection antenna is limited. Then, the background interference signal of the microwave Doppler detection antenna that increases with the corresponding Doppler intermediate frequency signal due to the increase in the thickness of the radiation source substrate can be limited, which is beneficial to improving the sensitivity of the microwave Doppler detection antenna while ensuring the anti-interference performance of the microwave Doppler detection antenna.

[0012] Another object of the present invention is to provide a microwave Doppler detection antenna and a method for manufacturing the same, wherein when the radiation element is fed, the radiation element is electrically connected to the reference ground electrode at the zero potential line to avoid the polarization balance mismatch caused by the design and processing errors of the radiation element from being aggravated by the increase in the thickness of the radiation source substrate, that is, to avoid the reduction in the stability of the microwave Doppler detection antenna caused by the increase in the thickness of the radiation source substrate, which is beneficial to ensure the working stability of the microwave Doppler detection antenna.

[0013] Another object of the present invention is to provide a microwave Doppler detection antenna and a method for manufacturing the same, wherein when the radiating element is fed, the reference ground is electrically connected to the reference ground electrode of the feed source, and wherein the radiating element is electrically connected to the reference ground electrode at the zero potential line, thereby forming a relationship in which the radiating element is electrically connected to the reference ground electrode. This is simple and easy to implement and will not cause congestion in the circuit layout, and is beneficial to improving the anti-interference performance of the microwave Doppler detection antenna and its adaptability to the current miniaturization trend.

[0014] Another object of the present invention is to provide a microwave Doppler detection antenna and a method for manufacturing the same, wherein the position description of the electrical feeding point is a limitation on the electrically equivalent feeding position of the radiating element, the physical feeding implementation structure of the electrical feeding point is diverse, and the corresponding circuit design of the microwave Doppler detection antenna is flexible and diverse and can adapt to different layout requirements.

[0015] Another object of the present invention is to provide a microwave Doppler detection antenna and a manufacturing method thereof, wherein the radiating element has at least one feed connection point corresponding to the physical access to the corresponding excitation signal, wherein on the radiating element, with the zero potential line as the boundary, on the same side of the zero potential line, when there is one feed connection point, the electrical feed point is equivalently located at the feed connection point, and when there are multiple feed connection points, the two feed connection points based on the midline of the line connecting the two feed connection points passing through the physical center point of the radiating element are equivalent to one feed connection point of the midpoint of the line connecting the two feed connection points, and the two feed connection points are equivalent to the midpoint of the line connecting the two feed connection points. The two feed connection points whose line passes through the physical center point of the radiating element are equivalent to one feed connection point which is the midpoint of the line connecting the two feed connection points. The arrangement of the feed connection points is set to be equivalent to one feed connection point, and the electrical feed point is equivalently located at this feed connection point, that is, the electrical connection relationship and position description of the electrical feed point is a limitation on the electrical connection relationship and position arrangement of the entity's feed connection point. The specific number and position arrangement of the feed connection points are flexible and varied, and the corresponding circuit design of the microwave Doppler detection antenna is flexible and diverse and can adapt to different layout requirements.

[0016] Another object of the present invention is to provide a microwave Doppler detection antenna and a manufacturing method thereof, wherein the feed connection point corresponds to the state of the point feeding (probe feeding) structure, the feed connection point is the point on the radiating element where the corresponding excitation signal is connected, wherein the feed connection point corresponds to the state of the microstrip feeding structure, the radiating element is connected to the corresponding excitation signal via a microstrip feeding line, the feed connection point is the point on the radiating element that is electrically connected to the microstrip feeding line, wherein the feed connection point corresponds to the state of the edge feeding structure, the radiating element is connected to the corresponding excitation signal via an edge feeder, wherein the edge feeder is a microstrip line adjacent to and parallel to the straight edge of the radiating element, and the feed connection point is the midpoint of the edge feeder set as a microstrip line, so the entity physical feeding structure corresponding to the feed connection point is diverse, and the entity physical feeding structure corresponding to the electrical feeding point of the radiating element is not limited to be the same, so the corresponding circuit design of the microwave Doppler detection antenna is flexible and diverse and can adapt to different layout requirements.

[0017] Another object of the present invention is to provide a microwave Doppler detection antenna and a method for manufacturing the same, wherein the radiating element is configured to allow it to be fed and polarized in a circularly polarized manner, thereby improving the anti-attenuation characteristics and anti-rain and fog interference capabilities of the microwave Doppler detection antenna, which is conducive to meeting the high accuracy requirements for detecting moving objects and adapting to outdoor detection scenarios.

[0018] Another object of the present invention is to provide a microwave Doppler detection antenna and a manufacturing method thereof, wherein, on the basis that the radiating element is equivalent to having one electrical feeding point, according to the equivalent principle of the electrical feeding point and the definition of the polarization direction and the zero potential line direction, the radiating element is newly provided with one electrical feeding point, wherein the two electrical feeding points are located on both sides of the radiating element bounded by the zero potential line, so that in the state where the radiating element is connected to two anti-phase excitation signals at the two electrical feeding points, the corresponding feed source is set to output two anti-phase excitation signals in the powered state, and a zero potential distribution of the radiating element is formed at the zero potential line of the radiating element, which is beneficial to suppress the polarization balance mismatch caused by the shape design and processing errors of the radiating element, and then the radiation efficiency of the microwave Doppler detection antenna is improved in a manner that balances and guarantees the potential distribution intensity of the radiating element in the fed state, and correspondingly improves the accuracy of the microwave Doppler detection antenna.

[0019] According to one aspect of the present invention, the present invention provides a microwave Doppler detection antenna, the microwave Doppler detection antenna comprising:

[0020] A feed source, wherein the feed source is configured to be powered and output at least one excitation signal with the positive electrode or the ground electrode of the corresponding power supply as a reference ground electrode;

[0021] At least one radiating element, wherein the radiating element is equivalent to having an electrical feeding point corresponding to the excitation signal, wherein the distance between the electrical feeding point and the physical center point of the radiating element is greater than or equal to λ / 128, wherein λ is a wavelength parameter corresponding to the frequency parameter of the excitation signal;

[0022] a reference ground, wherein the radiating element is spaced from the reference ground; and

[0023] A radiation source substrate, wherein the radiation source substrate is arranged between the radiation element and the reference ground to form a state in which the radiation element and the reference ground are separated by the radiation source substrate, wherein the dielectric constant of the radiation source substrate is greater than or equal to 7, wherein the radiation source substrate has a thickness greater than or equal to λ / 32 within an error range of 10%, wherein the direction of a line from the electrical feeding point on the radiation element to the physical center point of the radiation element is the polarization direction of the radiation element, and the straight line on the radiation element passing through the physical center point of the radiation element and perpendicular to the polarization direction is the zero potential line of the radiation element, wherein on the same side of the zero potential line, the distance between the edge of the radiation element and the edge of the radiation source substrate in the polarization direction is less than or equal to λ / 128.

[0024] In one embodiment, when the radiating element is fed by the excitation signal at the electrical feeding point, the radiating element is electrically connected to the reference ground at the zero potential line.

[0025] In one embodiment, when the radiating element is fed by receiving the excitation signal at the electrical feeding point, the reference ground is electrically connected to the reference ground of the feed source, and the radiating element is electrically connected to the reference ground at the zero potential line to form an electrical connection relationship between the radiating element and the reference ground at the zero potential line.

[0026] In one embodiment, the radiation source substrate is penetrated at a position corresponding to the zero potential line of the radiation element in a direction perpendicular to the radiation element and has at least one grounding hole, wherein a metal grounding piece is inserted into the grounding hole, and the radiation element is electrically connected to the reference ground via the metal grounding piece.

[0027] In one embodiment, the radiation element is electrically connected to the reference ground at the physical center point of the radiation element, and the corresponding radiation source substrate is penetrated by a direction perpendicular to the radiation element at a position corresponding to the physical center point of the radiation element to have a grounding hole, wherein the metal grounding piece is inserted into the grounding hole, and the radiation element is electrically connected to the reference ground at the physical center point of the radiation element via the metal grounding piece.

[0028] In one embodiment, the dimension a of the radiation element in the polarization direction satisfies a≤3λ / 16, and the dimension b in the zero potential line direction satisfies ≤λ / 4.

[0029] In one embodiment, the radiating element is arranged to be rectangular, wherein a dimension a of the rectangular radiating element in the polarization direction satisfies 3λ / 32≤a≤3λ / 16, and a dimension b of the radiating element in a direction perpendicular to the polarization direction satisfies λ / 8≤b≤λ / 4.

[0030] In one embodiment, the radiation element is arranged in a circular shape, wherein a diameter d of the circular radiation element is ≤ 3λ / 16.

[0031] In one embodiment, the side of the radiation element located on the zero potential line is arranged concavely in a direction toward the physical center point of the radiation element.

[0032] In one embodiment, the radiating element further has at least one degenerate mode separation unit, wherein the degenerate mode separation unit is integrally formed on the radiating element by hollowing out or cutting out the radiating element of a regular shape in a corresponding shape, wherein the radiating element is circularly polarized based on the setting of the degenerate mode separation unit to allow it to be polarized in a circularly polarized manner in a fed state.

[0033] In one embodiment, the radiation element is configured to be rectangular and has two degenerate mode separation units, wherein the two degenerate mode separation units are configured by cutting off two diagonal corners of the radiation element based on the radiation element being configured to be rectangular.

[0034] In one embodiment, the radiating element has at least one physical feed connection point corresponding to the corresponding excitation signal, wherein on the radiating element, with the zero potential line as the boundary, on the same side of the zero potential line, when there is one feed connection point, the electrical feed point is equivalently located at the feed connection point, and when there are multiple feed connection points, based on the equivalence principle that the two feed connection points connected to the excitation signal of the same phase through the physical center point of the radiating element are equivalent to one feed connection point at the midpoint of the line connecting the two feed connection points, and the two feed connection points connected to the excitation signal of different phases through the physical center point of the radiating element are equivalent to one feed connection point at the midpoint of the line connecting the two feed connection points, the arrangement of the feed connection points is set to satisfy the equivalent of one feed connection point, and the electrical feed point is equivalently located at this feed connection point.

[0035] In one embodiment, at least one of the feeding connection points corresponds to a point feeding structure and is implemented as a point on the radiating element to which a corresponding excitation signal is connected.

[0036] In one embodiment, the radiating element has a physical feeding connection point corresponding to the access to the corresponding excitation signal, wherein the feeding connection point corresponds to the point feeding structure and is implemented as a point on the radiating element for accessing the corresponding excitation signal.

[0037] In one embodiment, at least one of the feed connection points corresponds to a microstrip feeding structure, and the corresponding radiating element is connected to a corresponding excitation signal via a microstrip feeding line, wherein the feed connection point corresponding to the microstrip feeding structure is a point on the radiating element that is electrically connected to the microstrip feeding line.

[0038] In one embodiment, at least one of the feed connection points corresponds to an edge feed structure, and the corresponding radiating element is connected to a corresponding excitation signal via a edge feed line, wherein the edge feed line is a microstrip line adjacent to and parallel to the straight edge of the radiating element, and wherein the feed connection point corresponding to the edge feed structure is the midpoint of the edge feed line set as a microstrip line.

[0039] In one embodiment, the radiating element further has at least one additional feeding connection point, wherein the additional feeding connection point is equivalent to forming another electrical feeding point of the radiating element, that is, the radiating element has one additional electrical feeding point and has two electrical feeding points.

[0040] In one embodiment, the newly added electrical feeding point is located at the zero potential line of the radiating element, that is, two lines connecting the two electrical feeding points and the physical center point of the radiating element are vertical.

[0041] In one embodiment, the feed source is configured to output two excitation signals of the same phase when powered, and the radiating element is connected to one of the excitation signals at the two electrical feeding points respectively to have orthogonal polarization modes.

[0042] In one embodiment, the feed source is configured to output two excitation signals of the same phase via a power divider using one excitation signal.

[0043] In one embodiment, the feed source is configured to output two excitation signals with a phase difference of 90 degrees in a powered state, wherein the radiating element is connected to one of the excitation signals at the two electrical feeding points respectively and has a circular polarization mode.

[0044] In one embodiment, the feed source is configured to output two excitation signals with a phase difference of 90 degrees via a phase shifter using one excitation signal.

[0045] In one embodiment, the two electrical feeding points are located on both sides of the radiating element bounded by the zero potential line, and corresponding to one of the electrical feeding points, the physical center point of the radiating element and the connecting line sequentially connecting the other electrical feeding points have an angle greater than 90 degrees at the physical center point of the radiating element.

[0046] In one embodiment, the feed source is configured to output two excitation signals of opposite phases in a powered state, and the radiating element is connected to one of the excitation signals at the two electrical feeding points respectively.

[0047] In one embodiment, a line connecting the two electrical feeding points passes through a physical center point of the radiating element.

[0048] In one embodiment, the number of the newly added feeding connection point is one.

[0049] In one embodiment, the newly added feeding connection point is implemented as a point feeding structure as a point on the radiating element for accessing a corresponding excitation signal.

[0050] In one embodiment, the number of the newly added feeding connection points is two, wherein the two newly added feeding connection points are symmetrically distributed along a straight line passing through the physical center point of the radiating element in the polarization direction of the radiating element.

[0051] In one embodiment, the number of the newly added feeding connection points is three, wherein two of the newly added feeding connection points are symmetrically distributed along a straight line passing through the physical center point of the radiating element in the polarization direction of the radiating element, and the other feeding connection point is located at the midpoint of the line connecting the two feeding connection points.

[0052] In one embodiment, the radiation source substrate is a plate made of ceramic material.

[0053] In one embodiment, the radiation element is a conductive layer formed by curing the radiation source substrate using a silk-screen silver paste process.

[0054] In one embodiment, on the same side of a straight line passing through the physical center point of the radiation element 10 in the polarization direction, the edge of the radiation element and the edge of the radiation source substrate remain aligned in the direction of the zero potential line within an error range of λ / 128.

[0055] According to another aspect of the present invention, the present invention also provides a method for manufacturing a microwave Doppler detection antenna, the manufacturing method comprising the following steps:

[0056] (A) obtaining one or more layers of plate material having a dielectric constant greater than or equal to 7 and a thickness greater than or equal to λ / 32 within a 10% error range as a radiation source substrate, wherein λ is a wavelength parameter corresponding to a frequency parameter of the microwave Doppler detection antenna;

[0057] (B) covering the radiation source substrate with a conductive layer as a radiation element;

[0058] (C) defining a polarization direction and trimming the radiation source substrate with process parameters such that the edge of the radiation source substrate is aligned with the edge of the radiation element in the polarization direction within an error range of λ / 128;

[0059] (D) defining at least one feeding connection point on the radiating element at a position having a distance greater than or equal to λ / 128 from the physical center point of the radiating element in the polarization direction, and forming a corresponding number of feeding holes on the radiation source substrate at positions corresponding to the feeding connection point and penetrating the radiation source substrate in a direction perpendicular to the radiating element;

[0060] (E) inserting a metal feeding member into the feeding hole, and electrically connecting the radiating element to the metal feeding member; and

[0061] (F) Using a conductive layer having an area larger than that of the radiation element as a reference ground, and fixing the radiation source substrate to the reference ground in a state where the projection of the radiation element is located within the reference ground and the radiation element and the reference ground are separated by the radiation source substrate.

[0062] In one embodiment, in the step (D), when there are multiple feed connection points, based on the equivalent principle that the two feed connection points whose midline of the connection line of the two feed connection points connected to the excitation signals of the same phase passes through the physical center point of the radiating element are equivalent to one feed connection point of the midpoint of the connection line of the two feed connection points, and the two feed connection points whose line of the two feed connection points connected to the excitation signals of different phases passes through the physical center point of the radiating element are equivalent to one feed connection point of the midpoint of the connection line of the two feed connection points, the number and arrangement of the feed connection points are set to satisfy the ability to be equivalent to one feed connection point, and the corresponding feed point formed by the equivalent is the electrical feeding point of the radiating element, and the radiating element has one electrical feeding point.

[0063] In one embodiment, the method further comprises the steps of:

[0064] (G) The direction of a line connecting the electrical feeding point on the radiation element to the physical center point of the radiation element is taken as the polarization direction of the radiation element, and the straight line on the radiation element passing through the physical center point of the radiation element and perpendicular to the polarization direction is taken as the zero potential line of the radiation element, at least one grounding hole is formed on the radiation source substrate at a position corresponding to the zero potential line of the radiation element and penetrating the radiation source substrate in a direction perpendicular to the radiation element, and a metal grounding component is inserted into the grounding hole, and the radiation element and the reference ground are electrically connected to the metal grounding component, so as to form a relationship in which the radiation element is electrically connected to the reference ground via the metal grounding component at the zero potential line.

[0065] In one embodiment, in the step (G), a grounding hole is formed at a position on the radiation source substrate corresponding to the physical center point of the radiation element by penetrating the radiation source substrate in a direction perpendicular to the radiation element.

[0066] In one embodiment, in the step (D), when there are multiple feed connection points, based on the equivalent principle that the two feed connection points whose midline of the line connecting the two feed connection points connected to the excitation signals of the same phase passes through the physical center point of the radiating element are equivalent to one feed connection point whose midpoint is the line connecting the two feed connection points, and the two feed connection points whose line connecting the two feed connection points connected to the excitation signals of different phases passes through the physical center point of the radiating element are equivalent to one feed connection point whose midpoint is the line connecting the two feed connection points, the number and arrangement of the feed connection points are set to satisfy the ability to be equivalent to two feed connection points, and the two feed points formed equivalently are the electrical feeding points of the radiating element, and the radiating element has two electrical feeding points.

[0067] In one embodiment, according to step (D), a line sequentially connecting one of the electrical feeding points, the physical center point of the radiating element and another electrical feeding point has an angle greater than or equal to 90 degrees at the physical center point of the radiating element.

[0068] In one embodiment, according to the step (D), two lines connecting the two electrical feeding points and the physical center point of the radiating element are perpendicular to each other.

[0069] In one embodiment, a line connecting the two electrical feeding points passes through a physical center point of the radiating element.

[0070] In one embodiment, in the step (B), silver paste is screen-printed on the radiation source substrate and cured to form the radiation element covering the radiation source substrate.

[0071] In one embodiment, in the step (A), the radiation source substrate is a plate made of ceramic material. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1A It is a schematic diagram of the three-dimensional structure of an existing microwave Doppler detection antenna.

[0073] Figure 1B This is a schematic diagram of the working principle of an existing microwave Doppler detection antenna.

[0074] Figure 2A FIG. 4 is a schematic diagram of the working principle of a microwave Doppler detection antenna according to an embodiment of the present invention.

[0075] Figure 2B It is a schematic structural diagram of the microwave Doppler detection antenna according to the above embodiment of the present invention at a viewing angle perpendicular to the radiation element.

[0076] Figure 2C It is a schematic cross-sectional view along the polarization direction of the microwave Doppler detection antenna according to the above embodiment of the present invention.

[0077] Figure 2D It is a schematic diagram of the three-dimensional structure of the microwave Doppler detection antenna according to the above embodiment of the present invention.

[0078] Figure 3A It is a structural schematic diagram of the microwave Doppler detection antenna according to a variant embodiment of the above embodiment of the present invention at a viewing angle perpendicular to the radiation element.

[0079] Figure 3B It is a schematic structural diagram of the microwave Doppler detection antenna at a viewing angle perpendicular to the radiation element according to another variant embodiment of the above embodiment of the present invention.

[0080] Figure 3C It is a schematic structural diagram of the microwave Doppler detection antenna at a viewing angle perpendicular to the radiation element according to another variant embodiment of the above embodiment of the present invention.

[0081] Figure 3D It is a schematic structural diagram of the microwave Doppler detection antenna at a viewing angle perpendicular to the radiation element according to another variant embodiment of the above embodiment of the present invention.

[0082] Figure 4 It is a schematic structural diagram of the microwave Doppler detection antenna at a viewing angle perpendicular to the radiation element according to another variant embodiment of the above embodiment of the present invention.

[0083] Figure 5 It is a schematic structural diagram of the microwave Doppler detection antenna at a viewing angle perpendicular to the radiation element according to another variant embodiment of the above embodiment of the present invention.

[0084] Figure 6 It is a schematic structural diagram of the microwave Doppler detection antenna at a viewing angle perpendicular to the radiation element according to another variant embodiment of the above embodiment of the present invention.

[0085] Figure 7 It is a schematic structural diagram of the microwave Doppler detection antenna at a viewing angle perpendicular to the radiation element according to another variant embodiment of the above embodiment of the present invention.

[0086] Fig. 8A It is a schematic structural diagram of the microwave Doppler detection antenna at a viewing angle perpendicular to the radiation element according to another variant embodiment of the above embodiment of the present invention.

[0087] Figure 8B It is a schematic structural diagram of an implementation structure of the microwave Doppler detection antenna according to the above-mentioned variant embodiment of the present invention at a viewing angle perpendicular to the radiation element.

[0088] Figure 8C It is a schematic structural diagram of the microwave Doppler detection antenna at a viewing angle perpendicular to the radiation element according to another variant embodiment of the above embodiment of the present invention.

[0089] Fig.8D It is a schematic structural diagram of the microwave Doppler detection antenna at a viewing angle perpendicular to the radiation element according to another variant embodiment of the above embodiment of the present invention. DETAILED DESCRIPTION

[0090] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. 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 present invention 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 present invention.

[0091] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. 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 operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0092] 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.

[0093] Referring to the accompanying drawings of the present invention FIG. 2A to FIG. 2D, the structural principle of a microwave Doppler detection antenna according to an embodiment of the present invention is illustrated, wherein the microwave Doppler detection antenna adopts a planar radiation source structure and includes at least one radiation element 10 and a reference ground 20 spaced apart from the radiation element, and a radiation source substrate 30 arranged between the radiation element 10 and the reference ground 20 to form a state in which the radiation element 10 is spaced apart from the reference ground 20, wherein the radiation element 10 equivalently has at least one electrical feeding point 11, wherein in the state in which the radiation element 10 is fed by connecting a corresponding excitation signal to the electrical feeding point 11, the radiation element 10 is coupled with the reference ground 20 to establish an internal electric field 100 and an edge electric field 200 with the edge of the radiation element 10 as the boundary, then the internal electric field 100 is perpendicular to both the radiation element 10 and the reference ground 20 The electric field is established in a direction not perpendicular to the radiation element 10 and the reference ground 20, and the fringe electric field 200 is an electric field established in a direction not perpendicular to the radiation element 10 and the reference ground 20 at the same time. Since the internal electric field 100 is perpendicular to the radiation element 10 and the reference ground 20 at the same time, the energy of the internal electric field 100 is bounded and consumed in the portion of the radiation source substrate 30 bounded by the radiation element 10. Since the fringe electric field 200 is an electric field established in a direction not perpendicular to the radiation element 10 and the reference ground 20 at the same time, the fringe electric field 200 can form a radiation near field based on the alternating propagation of the electric field and the magnetic field and further form a radiation far field to form the emission of the microwave beam. That is to say, the energy of the fringe electric field 200 is the basis of the radiation energy of the microwave Doppler detection antenna and is directly related to the radiation gain of the microwave Doppler detection antenna.

[0094] In particular, in this embodiment of the present invention, by using a material with a dielectric constant greater than or equal to 7 as the radiation source substrate 30, such as using at least one of ceramic, mica, latex and resin composite materials in the form of one or more layers of plates as the radiation source substrate 30, and preferably using a ceramic material with a dielectric constant greater than or equal to 10 in the form of a layer of plates as the radiation source substrate 30, the minimum area size bottleneck of the radiation element 10 can be reduced, which is conducive to reducing the size of the microwave Doppler detection antenna. However, since the dielectric constant of the radiation source substrate 30 is increased relative to the existing microwave Doppler detection antenna, the radiation The increase in the dielectric constant of the radiation source substrate 30 corresponds to an increase in the intensity of the internal electric field 100, which can suppress the edge electric field 200. That is to say, the increase in the dielectric constant of the radiation source substrate 30 is not conducive to the formation of the radiation near field and the radiation far field of the microwave Doppler detection antenna, which correspondingly causes the radiation gain of the microwave Doppler detection antenna to be low or even unable to emit microwave beams normally. Therefore, the microwave Doppler detection antenna using a material with a dielectric constant greater than or equal to 7 as the radiation source substrate 30 is only suitable for receiving antennas and cannot be used in the field of microwave detection based on the Doppler effect principle in the form of a combined transmitter and receiver.

[0095] Based on this, in this embodiment of the present invention, the thickness of the radiation source substrate 30 is further set to be greater than or equal to λ / 32 within the error range of 10%, so that the inhibitory effect on the fringe electric field 200 caused by the enhancement of the internal electric field 100 due to the increase in the dielectric constant of the radiation source substrate 30 can be reduced, thereby ensuring the energy of the fringe electric field 200 of the microwave Doppler detection antenna in the fed state, and correspondingly ensuring the radiation gain of the microwave Doppler detection antenna, wherein λ is a wavelength parameter corresponding to the frequency parameter of the microwave Doppler detection antenna (that is, the frequency parameter of the corresponding excitation signal), that is, when a material with a dielectric constant greater than or equal to 7 is used as the On the basis of the radiation source substrate 30, by setting the thickness of the radiation source substrate to be greater than or equal to λ / 32 within an error range of 10%, the enhancement effect of the internal electric field 100 due to the increase in the dielectric constant of the radiation source substrate 30 is suppressed, and the inhibitory effect of the internal electric field 100 on the fringe electric field 200 is correspondingly reduced, thereby ensuring the radiation gain of the microwave Doppler detection antenna, and at the same time, due to the increase in the dielectric constant of the radiation source substrate 30, the minimum area size bottleneck of the radiation element 10 is reduced, which is conducive to significantly reducing the area of ​​the radiation element 10 by slightly increasing the thickness of the radiation source substrate 30 and reducing the size of the microwave Doppler detection antenna.

[0096] Specifically, in this embodiment of the present invention, the radiation element 10 is equivalent to having an electrical feeding point 11, wherein the direction of the line from the electrical feeding point 11 to the physical center point of the radiation element 10 is the polarization direction of the radiation element 10, the dielectric constant of the radiation source substrate 30 is greater than or equal to 7, and the thickness of the radiation source substrate 30 is greater than or equal to λ / 32 within an error range of 10%, for comparison with Figure 1A In the illustrated existing microwave Doppler detection antenna, the radiation element 10 is set to be rectangular, wherein when the radiation element 10 is set to be rectangular, the radiation element 10 has a size bottleneck greater than or equal to 3λ / 32 in the polarization direction, and has a size bottleneck greater than or equal to λ / 8 in the direction perpendicular to the polarization direction on the radiation element 10. Preferably, the dimension a of the radiation element in the polarization direction satisfies a≤3λ / 16, and the dimension b in the zero potential line direction satisfies ≤λ / 4, corresponding to the shape in which the radiation element 10 is set to be rectangular, the dimension a of the radiation element 10 in the polarization direction satisfies 3λ / 32≤a≤3λ / 16, and the dimension b in the direction perpendicular to the polarization direction on the radiation element 10 satisfies λ / 8≤b≤λ / 4, and when the radiation element 10 is set to be circular, the diameter d of the radiation element 10 is ≤3λ / 16. That is to say, when the microwave Doppler detection antenna is set to an operating frequency of 5.8 GHz, the corresponding λ is 51.7 mm, and the rectangular radiating element 10 has a size bottleneck of greater than or equal to 4.85 mm in the polarization direction, and a size bottleneck of greater than or equal to 6.46 mm in the direction perpendicular to the polarization direction on the radiating element 10. Therefore, compared with Figure 1A The 13mm*18mm size of the radiation element 21P of the existing microwave Doppler detection antenna shown in FIG. 1 presents a beneficial effect of significantly reducing the area of ​​the radiation element 10 by slightly increasing the thickness of the radiation source substrate 30 , thereby facilitating reducing the size of the microwave Doppler detection antenna.

[0097] It is worth mentioning that by increasing the thickness of the radiation source substrate 30 to be greater than or equal to λ / 32 within an error range of 10%, the microwave Doppler detection module's ability to receive weak electromagnetic wave signals is also enhanced, and the accuracy of the microwave Doppler detection antenna in detecting weak movements is correspondingly improved, so that the microwave Doppler detection antenna is suitable for detecting weak movements such as human movement, micro-movement, breathing and heartbeat, and is used for human presence detection.

[0098] It is also worth mentioning that in this embodiment of the present invention, in contrast to Figure 1AIn the existing microwave Doppler detection antenna shown in FIG. 1 , the radiation element 10 is set to be a rectangle, wherein the specific shapes of the radiation element 10 and the reference ground 20 do not constitute a limitation to the present invention, wherein the radiation element 10 and the reference ground 20 are preferably set to be conductive plates of regular shapes, such as but not limited to square, rectangle, circle, ellipse, isosceles trapezoid, isosceles triangle, ring, and regular polygon.

[0099] Furthermore, in this embodiment of the present invention, in the polarization direction of the radiation element 10, the edge of the radiation source substrate 30 is set to be aligned with the edge of the radiation element 10 within an error range of λ / 128, so as to further reduce the absorption of the energy of the fringe electric field 200 by the radiation source substrate 30 made of a material with a dielectric constant greater than or equal to 7, thereby ensuring the radiation gain of the microwave Doppler detection antenna by ensuring the energy size of the fringe electric field 200.

[0100] That is to say, on the same side of the straight line on the radiation element 10 passing through the physical center point of the radiation element 10 and perpendicular to the polarization direction, the distance between the edge of the radiation element 10 and the edge of the radiation source substrate 30 in the polarization direction is less than or equal to λ / 128, that is, on the same side of the straight line on the radiation element 10 passing through the physical center point of the radiation element 10 and perpendicular to the polarization direction, the dimension d1 of the radiation element 10 in the polarization direction and the dimension d2 of the radiation source substrate 30 in the polarization direction satisfy |d1-d2|≤λ / 128, wherein based on the corresponding manufacturing process, the dimension d1 of the radiation element 10 in the polarization direction is not limited to be less than or equal to the dimension d2 of the radiation source substrate 30 in the polarization direction, and preferably satisfies d1=d2. Therefore, in some embodiments of the present invention, the dimension d2 of the radiation source substrate 30 in the polarization direction is smaller than the dimension d1 of the radiation element 10 in the polarization direction, correspondingly, in the polarization direction, the radiation source substrate 30 between a portion of the edge of the radiation element 10 and the reference ground 20 is hollowed out.

[0101] It is worth mentioning that in the polarization direction of the radiation element 10, the edge of the radiation source substrate 30 is set to be aligned with the edge of the radiation element 10 within the error range of λ / 128, so that the board size of the radiation source substrate 30 can be reduced because the bottleneck of the minimum area size of the radiation element 10 is reduced. At the same time, the radiation source substrate 30 has a board area close to that of the radiation element 10, which is beneficial to reduce the waste of the radiation source substrate 30 and / or the waste of the material of the radiation element 10 during the production process of the microwave Doppler detection antenna, thereby helping to improve the economic benefits of the microwave Doppler detection antenna.

[0102] Furthermore, a straight line on the radiation element 10 passing through the physical center point of the radiation element 10 and perpendicular to the polarization direction of the radiation element 10 is taken as the zero potential line of the radiation element 10, wherein on the same side of the straight line passing through the physical center point of the radiation element 10 in the polarization direction, in the direction of the zero potential line of the radiation element 10, the edge of the radiation source substrate 30 is preferably arranged to be aligned with the edge of the radiation element 10 within an error range of λ / 128, so as to further reduce the plate size of the radiation source substrate 30 so that the radiation source substrate 30 has a plate area close to that of the radiation element 10.

[0103] In particular, the distance between the electrical feeding point 11 and the physical center point of the radiating element 10 is greater than or equal to λ / 128, which is beneficial to reducing the strength requirement of the microwave Doppler detection antenna for the corresponding excitation signal, so that when the radiating element 10 is fed by the corresponding excitation signal at the electrical feeding point 11, the microwave Doppler detection antenna is more likely to generate an initial polarization direction.

[0104] Furthermore, the microwave Doppler detection antenna also includes a feed source, wherein the feed source is configured to allow power to be supplied and output at least one excitation signal with the positive electrode or the ground of the corresponding power supply as the reference ground electrode. When the radiating element 10 is fed with power by receiving the excitation signal at the electrical feeding point 11, the radiating element 10 is electrically connected to the reference ground electrode at the zero potential line, thereby reducing the impedance of the microwave Doppler detection antenna at a frequency deviating from the resonant operating point, correspondingly narrowing the frequency bandwidth of the microwave Doppler detection antenna and facilitating improving the anti-interference performance of the microwave Doppler detection antenna.

[0105] It is worth mentioning that the impedance of the microwave Doppler detection antenna at a frequency deviating from the resonant operating point is reduced, and the corresponding frequency bandwidth of the microwave Doppler detection antenna is narrowed, that is, the quality factor of the microwave Doppler detection antenna is improved and the reception of the microwave Doppler detection antenna to signals outside the resonant frequency is limited. Then, the background interference signal of the microwave Doppler detection antenna that increases with the corresponding Doppler intermediate frequency signal due to the increase in the thickness of the radiation source substrate 30 can be limited, which is beneficial to improve the sensitivity of the microwave Doppler detection antenna while ensuring the anti-interference performance of the microwave Doppler detection antenna.

[0106] In addition, when the radiation element 10 is fed, the radiation element 10 is electrically connected to the reference ground at the zero potential line, thereby avoiding the polarization balance mismatch caused by the design and processing errors of the radiation element 10 from being aggravated by the increase in the thickness of the radiation source substrate 30, that is, avoiding the reduction in the stability of the microwave Doppler detection antenna caused by the increase in the thickness of the radiation source substrate 30, which is beneficial to ensuring the working stability of the microwave Doppler detection antenna.

[0107] Specifically, in this embodiment of the present invention, when the radiating element 10 is fed, the reference ground 20 is electrically connected to the reference ground electrode of the feed source, wherein the radiating element 10 is electrically connected to the reference ground electrode at the zero potential line, thereby forming a relationship in which the radiating element 10 is electrically connected to the reference ground electrode. This is simple and easy and will not cause congestion in the circuit layout, which is beneficial to improving the anti-interference performance of the microwave Doppler detection antenna and its adaptability to the current miniaturization trend.

[0108] Furthermore, in this embodiment of the present invention, when the radiating element 10 is fed by receiving the excitation signal at the electrical feeding point 11, the radiating element 10 is electrically connected to the reference ground 20 at the physical center point of the radiating element 10 and is electrically connected to the reference ground pole.

[0109] Specifically, the radiation source substrate 30 is penetrated by a grounding hole 31 in a direction perpendicular to the radiation element 10 at a position corresponding to the physical center point of the radiation element 10, wherein a metal grounding piece 311 is inserted into the grounding hole 31, wherein the radiation element 10 and the reference ground 20 are electrically connected to the metal grounding piece 311, and the radiation element 10 is electrically connected to the reference ground 20 at the physical center point of the radiation element 10 via the metal grounding piece 311.

[0110] It is worth mentioning that, in the state where the radiating element 10 is fed, the radiating element 10 is electrically connected to the reference ground at the zero potential line, wherein the number and specific positions of the connection points between the radiating element 10 and the reference ground do not constitute a limitation to the present invention. Corresponding to the state where the reference ground 20 is electrically connected to the reference ground of the feed source, the radiation source substrate 30 is penetrated in a direction perpendicular to the radiating element 10 at a position corresponding to the zero potential line of the radiating element 10 and has at least one grounding hole 31, wherein the specific number of the grounding holes 31 does not constitute a limitation to the present invention. In some embodiments of the present invention, the number of the grounding holes 31 is multiple, and preferably they are symmetrically distributed at the position of the radiation source substrate 30 corresponding to the zero potential line of the radiating element 10 with the physical center point of the radiating element 10, so as to facilitate the balanced distribution of the potential of the radiating element 10 in the fed state and ensure the working stability of the microwave Doppler detection antenna.

[0111] In particular, the position description of the electrical feeding point 11 is a limitation on the electrical equivalent feeding position of the radiating element 10. The physical feeding implementation structure of the electrical feeding point 11 is diverse, and the corresponding circuit design of the microwave Doppler detection antenna is flexible and diverse and can adapt to different layout requirements.

[0112] Specifically, referring to the accompanying drawings of the present invention, FIG. 3A to FIG. 3D, the microwave Doppler detection antenna according to different variant embodiments of the above-mentioned embodiment of the present invention is illustrated, wherein the radiating element 10 is equivalent to having a state of the electrical feeding point 11, and the radiating element 10 has at least one physical feeding connection point 111 corresponding to the access to the corresponding excitation signal, wherein on the radiating element 10, with the zero potential line as the boundary, on the same side of the zero potential line, when there is one feeding connection point 111, the electrical feeding point 11 is equivalently located at the feeding connection point 111, and when there are multiple feeding connection points 111, the two feeding connection points 111 based on the midline of the line connecting the two feeding connection points 111 connected to the excitation signal of the same phase passing through the physical center point of the radiating element 10 are equivalent to one feeding connection point 11 at the midpoint of the line connecting the two feeding connection points 111. 1, and the two feeding connection points 111 connected to the excitation signals of different phases pass through the physical center point of the radiating element 10, and the two feeding connection points 111 are equivalent to one feeding connection point 111 at the midpoint of the line connecting the two feeding connection points 111. The arrangement of the feeding connection points 111 is set to satisfy the equivalent of one feeding connection point 111, and the electrical feeding point 11 is equivalently located at this feeding connection point 111, that is, the electrical connection relationship and position description of the electrical feeding point 11 is a limitation on the electrical connection relationship and position arrangement of the entity's feeding connection point 111. The specific number and position arrangement of the feeding connection points 111 and the feeding structure are flexible and changeable, and the corresponding circuit design of the microwave Doppler detection antenna is flexible and diverse and can adapt to different layout requirements.

[0113] Specifically, the feeding connection point 111 corresponds to the state of the point feeding (probe feeding) structure, and the feeding connection point 111 is the point on the radiating element 10 to which the corresponding excitation signal is connected, wherein the feeding connection point 111 corresponds to the state of the microstrip feeding structure, and the radiating element 10 is connected to the corresponding excitation signal via a microstrip feeding line 12, and the feeding connection point 111 is the point on the radiating element 10 that is electrically connected to the microstrip feeding line 12, wherein the feeding connection point 111 corresponds to the state of the edge feeding structure, and the radiating element 10 is connected to the corresponding excitation signal through a side feed line 13, wherein the side feed line 13 is a microstrip line adjacent to and parallel to the straight side of the radiating element 10, and the feeding connection point 111 is the midpoint of the side feed line 13 set as a microstrip line. Therefore, the entity physical feeding structure corresponding to the feeding connection point 111 is diverse, and the entity physical feeding structure corresponding to the electrical feeding point 11 of the radiating element 10 is not restricted to be the same. Therefore, the circuit design of the corresponding microwave Doppler detection antenna is flexible and diverse and can adapt to different layout requirements.

[0114] It is worth mentioning that, based on the structural design that the edge of the radiation source substrate 30 is arranged to be aligned with the edge of the radiation element 10 within an error range of λ / 128, the feeding connection point 111 is preferably arranged in a point feeding (probe feeding) structure.

[0115] Continuing to refer to the accompanying drawings of the present invention Figure 2C As shown, in this embodiment of the present invention, the number of the feeding connection point 111 is one and is arranged in a point feeding (probe feeding) structure, wherein the microwave Doppler detection antenna further includes a reference ground substrate 40, wherein the reference ground 20 is carried on the reference ground substrate 40, and a structural relationship in which the radiation element 10, the radiation source substrate 30, the reference ground 20, and the reference ground substrate 40 are stacked in sequence is formed correspondingly, wherein the radiation source substrate 30 and the reference ground substrate 40 are penetrated at a position corresponding to the feeding connection point 111 of the radiation element 10 in a direction perpendicular to the radiation element 10 and each has a feeding hole 32, wherein a metal feeding component 321 is inserted into the feeding hole 32, wherein the feed source is arranged on a side of the reference ground substrate 40 opposite to a side carrying the reference ground 20, wherein the radiation element 10 is electrically coupled to the feed source at the electrical feeding point 11 of the radiation element 10 via the metal feeding component 321.

[0116] In particular, referring to the accompanying drawings of the present invention, Figure 4 As shown, the microwave Doppler detection antenna according to a variant embodiment of the above-mentioned embodiment of the present invention is illustrated, wherein in this variant embodiment of the present invention, the edge of the radiating element 10 located on the zero potential line is set inwardly in the direction toward the physical center point of the radiating element 10, so as to maintain the radiating element 10 with a suitable circumference to ensure the gain of the microwave Doppler detection antenna, while it is beneficial to further reduce the size of the microwave Doppler detection antenna by reducing the size of the radiating element 10 to adapt to the current miniaturization trend.

[0117] It is worth mentioning that when the two sides of the radiating element 10 located on the zero potential line are set inwardly in the direction toward the physical center point of the radiating element 10, the side lengths of the two sides of the radiating element 10 located on the zero potential line are relatively elongated, which is beneficial to strengthen the electric field formed by the self-coupling of the radiating element 10 due to the potential distribution in the polarization direction, thereby helping to suppress and balance the internal electric field 100 of the microwave Doppler detection antenna, thereby improving the radiation gain of the microwave Doppler detection antenna and suppressing the sidelobe radiation of the microwave Doppler detection antenna, thereby helping to improve the detection accuracy and anti-interference performance of the microwave Doppler detection antenna.

[0118] Preferably, in this variant embodiment of the present invention, in the direction of the zero potential line of the radiation element 10, the edge of the radiation source substrate 30 is set to be aligned with the edge of the radiation element 10 within an error range of λ / 128, and the two edges of the corresponding radiation source substrate 30 located on the zero potential line are set concavely in the direction toward the physical center point of the radiation element 10.

[0119] Further reference is made to the accompanying drawings of the present invention. Figure 5 As shown, the microwave Doppler detection antenna according to another variant embodiment of the above-mentioned embodiment of the present invention is illustrated, wherein in this variant embodiment of the present invention, the radiating element 10 is circularly polarized and allowed to be polarized in a circularly polarized manner when fed, thereby improving the anti-attenuation characteristics and anti-rain and fog interference capabilities of the microwave Doppler detection antenna, which is conducive to meeting the high accuracy requirements for the detection of moving objects and adapting to outdoor detection scenarios.

[0120] Specifically, in this variant embodiment of the present invention, the radiating element 10 further has at least one degenerate mode separation unit 14, wherein the degenerate mode separation unit 14 is integrally formed on the radiating element 10 by hollowing out or cutting out the regular-shaped radiating element 10 in a corresponding shape, so as to generate two degenerate modes with orthogonal polarizations in the radiating element 10 when the radiating element 10 is fed, wherein the resonant frequencies of the two degenerate modes with orthogonal polarizations are separated to form a phase difference of 90°, so that the radiating element 10 is polarized in a circular polarization manner when it is fed.

[0121] It is worth mentioning that the formation of the degenerate mode is an electrical expression of the polarization principle of the circularly polarized radiation source 10 , and accordingly the circularly polarized radiation source 10 does not have a physical structure or mark corresponding to the degenerate mode.

[0122] Specifically, in this variant embodiment of the present invention, the radiation element 10 is set to a rectangle, wherein the radiation element 10 based on the rectangular shape has two degenerate mode separation units 14, wherein the two degenerate mode separation units 14 are set by cutting off two diagonal corners of the radiation element 10 based on the radiation element 10 being set to a rectangular shape.

[0123] Further reference is made to the accompanying drawings of the present invention. Figures 6 to 8D As shown, the microwave Doppler detection antenna according to different variant embodiments of the above-mentioned embodiments of the present invention is illustrated. On the basis that the radiating element 10 in the above-mentioned embodiments is equivalent to having one electrical feeding point 11, according to the equivalent principle of the aforementioned electrical feeding point 11, in these variant embodiments of the present invention, the radiating element 10 is further provided with at least one feeding connection point 111 to equivalently form another electrical feeding point 11 of the radiating element 10.

[0124] Specifically, corresponding to Figure 6 In the above embodiment, the radiating element 10 is equivalent to one electrical feeding point 11. According to the equivalent principle of the electrical feeding point 11 and the definition of the polarization direction and the zero potential line direction, in this variant embodiment of the present invention, the newly added electrical feeding point 11 is located on the zero potential line of the radiating element 10, that is, the two lines connecting the two electrical feeding points 11 and the physical center point of the radiating element 10 are vertical.

[0125] In particular, in this variant embodiment of the present invention, when the radiating element 10 is fed by receiving an excitation signal with the same phase at the two electrical feeding points 11, the corresponding feed source is set to output two excitation signals with the same phase in the powered state, such as outputting two excitation signals with the same phase through a corresponding power divider with one excitation signal, or directly outputting two excitation signals with the same phase, and the radiating element 10 can have an orthogonal polarization mode, which is beneficial to improving the anti-interference performance of the microwave Doppler detection antenna. When the radiating element 10 is fed by receiving an excitation signal with a phase difference of 90 degrees at the two electrical feeding points 11, the corresponding feed source is set to output two excitation signals with a phase difference of 90 degrees in the powered state, such as outputting two excitation signals with a phase difference of 90 degrees through a corresponding phase shifter (including but not limited to a microstrip line) with one excitation signal, or directly outputting two excitation signals with a phase difference of 90 degrees, and the radiating element 10 can be polarized in a circular polarization mode, which is beneficial to improving the anti-attenuation characteristics and anti-rain and fog interference capabilities of the microwave Doppler detection antenna.

[0126] Specifically, on the basis that the radiating element 10 in the above embodiment is equivalent to one electrical feeding point 11, according to the equivalent principle of the electrical feeding point 11 and the definition of the polarization direction and the zero potential line direction, in this variant embodiment of the present invention, the radiating element 10 is further provided with a feeding connection point 111 in a point feeding (probe feeding) structure, so as to form a newly added electrical feeding point 11 which is equivalent to the feeding connection point 111.

[0127] Corresponds to Figures 7 to 8DIn the above embodiments, the radiating element 10 is equivalent to one electrical feeding point 11. According to the equivalent principle of the electrical feeding point 11 and the definition of the polarization direction and the zero potential line direction, in these variant embodiments of the present invention, the two electrical feeding points 11 are located on both sides of the radiating element 10 bounded by the zero potential line. In this way, when the radiating element 10 is connected to two anti-phase excitation signals at the two electrical feeding points 11, the corresponding feed source is set to output two anti-phase excitation signals in the powered state, and a zero potential distribution of the radiating element 10 is formed at the zero potential line of the radiating element 10, which is beneficial to suppress the polarization balance mismatch caused by the shape design and processing errors of the radiating element 10, and then the radiation efficiency of the microwave Doppler detection antenna is improved in a way of balancing and ensuring the potential distribution intensity of the radiating element 10 in the fed state, and the accuracy of the microwave Doppler detection antenna is correspondingly improved.

[0128] Further, corresponding to Figure 7 , the newly added electrical feeding point 11 is equivalently located on the radiating element 10 at a position deviated from the straight line passing through the physical center point of the radiating element 10 in the polarization direction. Specifically, on the basis that the radiating element 10 in the above embodiment is equivalent to having one electrical feeding point 11, according to the equivalent principle of the electrical feeding point 11 and the definition of the polarization direction and the zero potential line direction, in this variant embodiment of the present invention, with the zero potential line of the radiating element 10 as the boundary, on the side of the radiating element 10 opposite to the side where the electrical feeding point 11 is equivalently formed, the radiating element 10 is further provided with a feeding connection point 111 in a point feeding (probe feeding) structure, wherein this feeding connection point 111 deviates from the straight line passing through the physical center point of the radiating element 10 in the polarization direction, so that the newly added electrical feeding point 11 is equivalently formed at this feeding connection point 111.

[0129] Preferably, corresponding to FIG. 8A to FIG. 8D The newly added electrical feeding point 11 is equivalently located on the straight line passing through the physical center point of the radiating element 10 in the polarization direction, that is, the line connecting the two electrical feeding points 11 passes through the physical center point of the radiating element 10, so that when the radiating element 10 is fed with reverse phase dual power, a zero potential point of the radiating element is formed at the physical center point of the radiating element 10, which is beneficial to suppress the polarization balance mismatch caused by the shape design and processing errors of the radiating element 10, and then improve the radiation efficiency of the microwave Doppler detection antenna in a way of balancing and ensuring the potential distribution intensity of the radiating element 10 in the fed state, and correspondingly improve the accuracy of the microwave Doppler detection antenna.

[0130] Specifically, corresponding to Fig. 8AIn the above embodiment, on the basis that the radiating element 10 is equivalent to having an electrical feeding point 11, according to the equivalent principle of the electrical feeding point 11 and the definition of the polarization direction and the zero potential line direction, in this variant embodiment of the present invention, with the zero potential line of the radiating element 10 as the boundary, on the side of the radiating element 10 opposite to the side where the electrical feeding point 11 is equivalently formed, the radiating element 10 is further provided with a feeding connection point 111 in a point feeding (probe feeding) structure, wherein the feeding connection point 111 is located on a straight line passing through the physical center point of the radiating element 10 in the polarization direction, so that the newly added electrical feeding point 11 is equivalently formed with the feeding connection point 111.

[0131] Preferably, corresponding to Figure 8B , in a state where the line connecting the two electrical feeding points 11 passes through the physical center point of the radiating element 10, the two electrical feeding points 11 are respectively set as a feeding connection point 111 in a point feeding (probe feeding) structure, wherein the two feeding connection points 111 are further preferably set to be symmetrically distributed with respect to the physical center point of the radiating element 10, that is, the two feeding connection points 111 are symmetrically distributed with respect to the physical center point of the radiating element 10 on a straight line of the radiating element 10 in the polarization direction passing through the physical center point of the radiating element 10.

[0132] Optionally, corresponding to Figure 8C and Fig.8D In the above embodiment, the radiating element 10 is equivalent to one electrical feeding point 11. According to the equivalent principle of the electrical feeding point 11 and the definition of the polarization direction and the zero potential line direction, in the two variant embodiments of the present invention, with the zero potential line of the radiating element 10 as the boundary, on the side of the radiating element 10 opposite to the side where the electrical feeding point 11 is equivalently formed, the radiating element 10 is further provided with a plurality of the feeding connection points 111 in a point feeding (probe feeding) structure, and the midline of the line connecting the two feeding connection points 111 connected to the excitation signal of the same phase passes through the physical center point of the radiating element 10. According to the equivalent principle that the two feed connection points 111 are equivalent to one feed connection point 111 which is the midpoint of the line connecting the two feed connection points 111, and the two feed connection points 111 whose line connects the two feed connection points 111 with excitation signals of different phases passing through the physical center point of the radiating element 10 are equivalent to one feed connection point 111 which is the midpoint of the line connecting the two feed connection points 111, the arrangement of the newly added feed connection points 111 is set to satisfy the requirement of being equivalent to one feed connection point 111, and the newly added electrical feed point 11 is equivalently located at this feed connection point 111.

[0133] Corresponds to Figure 8C In the above embodiment, the radiating element 10 is equivalent to one electrical feeding point 11. According to the equivalent principle of the electrical feeding point 11 and the definition of the polarization direction and the zero potential line direction, in this variant embodiment of the present invention, with the zero potential line of the radiating element 10 as the boundary, on the side of the radiating element 10 opposite to the side where the electrical feeding point 11 is equivalently formed, the radiating element 10 is further provided with two feeding connection points 111 in a point feeding (probe feeding) structure, wherein the midline of the connection line of the two feeding connection points 111 passes through the physical center point of the radiating element 10. Specifically, the midline of the connection line of the two feeding connection points 111 is located at the The polarization direction of the radiating element 10, that is, the two feeding connection points 111 are symmetrically distributed along a straight line passing through the physical center point of the radiating element 10 in the polarization direction of the radiating element 10, so that the two feeding connection points 111 are connected to the state of the excitation signal with the same phase, such as when the feed source is set to output two excitation signals of opposite phases in the powered state, one of the excitation signals is output through the corresponding power divider to the two feeding connection points 111 with the same phase, and the newly added electrical feeding point 11 is equivalently formed at the midpoint of the line connecting the two feeding connection points 111, corresponding to the arrangement state of the line connecting the two electrical feeding points 11 passing through the physical center point of the radiating element 10.

[0134] Corresponds to Fig.8DIn the above embodiment, the radiating element 10 is equivalent to one electrical feeding point 11, according to the equivalent principle of the electrical feeding point 11 and the definition of the polarization direction and the zero potential line direction, in this variant embodiment of the present invention, with the zero potential line of the radiating element 10 as the boundary, on the side of the radiating element 10 opposite to the side where the electrical feeding point 11 is equivalently formed, the radiating element 10 is further provided with three feeding connection points 111 in a point feeding (probe feeding) structure. Among the three feeding connection points 111, the midline of the line connecting two of the feeding connection points 111 passes through the physical center point of the radiating element 10 and the other feeding connection point 111. Specifically, the connection line of the two feeding connection points 111 passes through the physical center point of the radiating element 10 and the other feeding connection point 111. The midline of the line is located in the polarization direction of the radiating element 10, that is, the two feeding connection points 111 are symmetrically distributed on a straight line passing through the physical center point of the radiating element 10 in the polarization direction of the radiating element 10, and the other feeding connection point 111 is located on the straight line passing through the physical center point of the radiating element 10 in the polarization direction. Based on the above-mentioned equivalent principle, the two feeding connection points 111 symmetrically distributed on a straight line passing through the physical center point of the radiating element 10 in the polarization direction of the radiating element 10 are equivalent to one feeding connection point at the midpoint of the line connecting the two feeding connection points 111, and the newly added electrical feeding point 11 is equivalently formed at the midpoint of the line connecting the other feeding connection point 111 and the equivalently formed feeding connection point.

[0135] In particular, in this variant embodiment of the present invention, the three feeding connection points 111 are located on the same straight line, that is, one of the feeding connection points 111 is located at the midpoint of the line connecting the other two feeding connection points 111 which are symmetrically distributed along the straight line passing through the physical center point of the radiating element 10 in the polarization direction of the radiating element 10, and the corresponding electrical feeding point 11 is located at the midpoint of the line connecting the other two feeding connection points 111 which are symmetrically distributed along the straight line passing through the physical center point of the radiating element 10 in the polarization direction of the radiating element 10.

[0136] It is worth mentioning that the specific number of the electrical feeding points 11 and the corresponding feeding method do not constitute a limitation of the present invention, and when the radiating element 10 has a plurality of the electrical feeding points 11, the physical feeding structure of each electrical feeding point 11 is not limited to be the same, wherein based on the equivalent principle of the aforementioned electrical feeding points 11 and the corresponding feeding structure of the corresponding feeding connection point 111, the feeding structure of the radiating element 10 has a variety of deformation modes, and the above embodiments are only examples, wherein the features of different embodiments can be combined with each other to obtain an implementation method that is easy to think of based on the contents disclosed in the present invention but is not explicitly stated in the accompanying drawings.

[0137] To further understand the present invention, the present invention further provides a method for manufacturing a microwave Doppler detection antenna, wherein the method for manufacturing a microwave Doppler detection antenna comprises the following steps:

[0138] (A) obtaining a plate having a dielectric constant greater than or equal to 7 and a thickness greater than or equal to λ / 32 within a 10% error range as a radiation source substrate, wherein λ is a wavelength parameter corresponding to a frequency parameter of the microwave Doppler detection antenna;

[0139] (B) covering the radiation source substrate with a conductive layer as a radiation element;

[0140] (C) defining a polarization direction and trimming the radiation source substrate with process parameters such that the edge of the radiation source substrate is aligned with the edge of the radiation element 10 in the polarization direction within an error range of λ / 128;

[0141] (D) defining at least one feeding connection point on the radiating element at a position having a distance greater than or equal to λ / 128 from the physical center point of the radiating element in the polarization direction, and forming a corresponding number of feeding holes on the radiation source substrate at positions corresponding to the feeding connection point and penetrating the radiation source substrate in a direction perpendicular to the radiating element;

[0142] (E) inserting a metal feeding member into the feeding hole, and electrically connecting the radiating element to the metal feeding member; and

[0143] (F) Using a conductive layer having an area larger than that of the radiation element as a reference ground, and fixing the radiation source substrate to the reference ground in a state where the projection of the radiation element is located within the reference ground and the radiation element and the reference ground are separated by the radiation source substrate.

[0144] It is worth mentioning that in the description of the manufacturing method of the microwave Doppler detection antenna described above, the numbering of the corresponding steps does not constitute a limitation on the order between the steps, that is, the order of the steps does not constitute a limitation on the present invention.

[0145] Specifically, in the step (D), when there are multiple feed connection points, based on the equivalent principle that the two feed connection points whose midline of the connection line of the two feed connection points connected to the excitation signals of the same phase passes through the physical center point of the radiating element are equivalent to one feed connection point of the midpoint of the connection line of the two feed connection points, and the two feed connection points whose line of the two feed connection points connected to the excitation signals of different phases passes through the physical center point of the radiating element are equivalent to one feed connection point of the midpoint of the connection line of the two feed connection points, the number and arrangement of the feed connection points are set to satisfy the ability to be equivalent to one feed connection point, and the corresponding feed point formed by the equivalent is the electrical feeding point of the radiating element, and the radiating element has one electrical feeding point.

[0146] In particular, in some embodiments of the present invention, the method for manufacturing the microwave Doppler detection antenna further comprises the steps of:

[0147] (G) The direction of a line connecting the electrical feeding point on the radiation element to the physical center point of the radiation element is taken as the polarization direction of the radiation element, and the straight line on the radiation element passing through the physical center point of the radiation element and perpendicular to the polarization direction is taken as the zero potential line of the radiation element, at least one grounding hole is formed on the radiation source substrate at a position corresponding to the zero potential line of the radiation element and penetrating the radiation source substrate in a direction perpendicular to the radiation element, and a metal grounding component is inserted into the grounding hole, and the radiation element and the reference ground are electrically connected to the metal grounding component, so as to form a relationship in which the radiation element is electrically connected to the reference ground via the metal grounding component at the zero potential line.

[0148] Preferably, in the step (G), a grounding hole is formed at a position on the radiation source substrate corresponding to the physical center point of the radiation element by penetrating the radiation source substrate in a direction perpendicular to the radiation element.

[0149] Particularly, in the step (B), silver paste is screen-printed on the radiation source substrate and cured to form the radiation element covering the radiation source substrate.

[0150] Further, in some embodiments of the present invention, in the step (D), when there are multiple feed connection points, based on the equivalent principle that the two feed connection points whose midline of the line connecting the two feed connection points connected to the excitation signals of the same phase passes through the physical center point of the radiating element are equivalent to one feed connection point whose midpoint is the line connecting the two feed connection points, and the two feed connection points whose line connecting the two feed connection points connected to the excitation signals of different phases passes through the physical center point of the radiating element are equivalent to one feed connection point whose midpoint is the line connecting the two feed connection points, the number and arrangement of the feed connection points are set to satisfy the ability to be equivalent to two feed connection points, and the two feed points formed equivalently are the electrical feeding points of the radiating element, and the radiating element has two electrical feeding points.

[0151] In some embodiments of the present invention, according to step (D), a line sequentially connecting one of the electrical feeding points, the physical center point of the radiating element, and another electrical feeding point has an angle greater than or equal to 90 degrees at the physical center point of the radiating element.

[0152] In some other embodiments of the present invention, according to step (D), two lines connecting the two electrical feeding points and the physical center point of the radiating element are perpendicular to each other.

[0153] In some other embodiments of the present invention, according to step (D), the line connecting the two electrical feeding points passes through the physical center point of the radiating element.

[0154] 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 functional 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. A microwave Doppler detection antenna, characterized in that: include: A feed source, wherein the feed source is configured to be powered and output at least one excitation signal with the positive electrode or the ground electrode of the corresponding power supply as a reference ground electrode; At least one radiating element, wherein the radiating element is equivalent to having an electrical feeding point corresponding to the excitation signal, wherein the distance between the electrical feeding point and the physical center point of the radiating element is greater than or equal to λ / 128, wherein λ is a wavelength parameter corresponding to the frequency parameter of the excitation signal; a reference ground, wherein the radiating element is spaced apart from the reference ground; as well as A radiation source substrate, wherein the radiation source substrate is arranged between the radiation element and the reference ground to form a state in which the radiation element and the reference ground are separated by the radiation source substrate, wherein the dielectric constant of the radiation source substrate is greater than or equal to 7, wherein the radiation source substrate has a thickness greater than or equal to λ / 32 within an error range of 10%, wherein the direction of a line from the electrical feeding point on the radiation element to the physical center point of the radiation element is the polarization direction of the radiation element, and the straight line on the radiation element passing through the physical center point of the radiation element and perpendicular to the polarization direction is the zero potential line of the radiation element, wherein on the same side of the zero potential line, the distance between the edge of the radiation element and the edge of the radiation source substrate in the polarization direction is less than or equal to λ / 128.

2. The microwave Doppler detection antenna according to claim 1, wherein when the radiating element is fed by receiving the excitation signal at the electrical feeding point, the radiating element is electrically connected to the reference ground at the zero potential line.

3. The microwave Doppler detection antenna according to claim 2, wherein when the radiating element is fed by receiving the excitation signal at the electrical feeding point, the reference ground is electrically connected to the reference ground electrode of the feed source, and wherein the radiating element is electrically connected to the reference ground at the zero potential line to form an electrical connection relationship between the radiating element at the zero potential line and the reference ground electrode.

4. The microwave Doppler detection antenna according to claim 3, wherein the radiation source substrate is penetrated by at least one grounding hole in a direction perpendicular to the radiation element at a position corresponding to the zero potential line of the radiation element, wherein a metal grounding piece is inserted into the grounding hole, and wherein the radiation element is electrically connected to the reference ground via the metal grounding piece.

5. The microwave Doppler detection antenna according to claim 4, wherein the radiation element is electrically connected to the reference ground at the physical center point of the radiation element, and the corresponding radiation source substrate is penetrated by a direction perpendicular to the radiation element at a position corresponding to the physical center point of the radiation element and has a grounding hole, wherein the metal grounding piece is inserted into the grounding hole, and wherein the radiation element is electrically connected to the reference ground at the physical center point of the radiation element via the metal grounding piece. 6 . The microwave Doppler detection antenna according to claim 5 , wherein the dimension a of the radiation element in the polarization direction satisfies a≤3λ / 16, and the dimension b in the zero potential line direction satisfies ≤λ / 4.

7. The microwave Doppler detection antenna according to claim 6, wherein the radiating element is set to a rectangle, wherein the dimension a of the rectangular radiating element in the polarization direction satisfies 3λ / 32≤a≤3λ / 16, and the dimension b on the radiating element in a direction perpendicular to the polarization direction satisfies λ / 8≤b≤λ / 4. 8 . The microwave Doppler detection antenna according to claim 6 , wherein the radiation element is arranged in a circular shape, wherein a diameter d of the circular radiation element is ≤ 3λ / 16.

9. The microwave Doppler detection antenna according to claim 6, wherein the side of the radiation element located on the zero potential line is arranged concavely in a direction toward a physical center point of the radiation element.

10. The microwave Doppler detection antenna according to claim 6, wherein the radiating element further has at least one degenerate mode separation unit, wherein the degenerate mode separation unit is integrally formed on the radiating element by hollowing out or cutting out the radiating element of a regular shape in a corresponding shape, wherein the radiating element is circularly polarized based on the setting of the degenerate mode separation unit and allows it to be polarized in a circularly polarized manner in a fed state.

11. The microwave Doppler detection antenna according to claim 10, wherein the radiating element is arranged in a rectangular shape and has two degenerate mode separation units, wherein the two degenerate mode separation units are arranged by cutting off two diagonals of the radiating element based on the radiating element being arranged in a rectangular shape.

12. A microwave Doppler detection antenna according to any one of claims 1 to 11, wherein the radiating element has at least one physical feed connection point corresponding to the corresponding excitation signal, wherein on the radiating element, with the zero potential line as the boundary, on the same side of the zero potential line, when there is one feed connection point, the electrical feed point is equivalently located at the feed connection point, and when there are multiple feed connection points, based on the equivalent principle that the midline of the line connecting the two feed connection points connecting the excitation signals of the same phase passing through the physical center point of the radiating element is equivalent to one feed connection point at the midpoint of the line connecting the two feed connection points, and the line connecting the two feed connection points connecting the excitation signals of different phases passing through the physical center point of the radiating element is equivalent to one feed connection point at the midpoint of the line connecting the two feed connection points, the arrangement of the feed connection points is set to satisfy the equivalent of being one feed connection point, and the electrical feed point is equivalently located at this feed connection point.

13. The microwave Doppler detection antenna according to claim 12, wherein at least one of the feed connection points corresponds to a point feeding structure and is implemented as a point on the radiating element to which a corresponding excitation signal is connected.

14. The microwave Doppler detection antenna according to claim 13, wherein the radiating element has a physical feeding connection point corresponding to the access to the corresponding excitation signal, wherein the feeding connection point corresponds to the point feeding structure and is implemented as a point on the radiating element for accessing the corresponding excitation signal.

15. The microwave Doppler detection antenna according to claim 12, wherein at least one of the feeding connection points corresponds to a microstrip feeding structure, and the corresponding radiating element is connected to a corresponding excitation signal via a microstrip feeding line, wherein the feeding connection point corresponding to the microstrip feeding structure is a point on the radiating element that is electrically connected to the microstrip feeding line.

16. The microwave Doppler detection antenna according to claim 12, wherein at least one of the feed connection points corresponds to a side feed structure, and the corresponding radiating element is connected to a corresponding excitation signal via a side feed line, wherein the side feed line is a microstrip line adjacent to and parallel to the straight edge of the radiating element, and wherein the feed connection point corresponding to the side feed structure is the midpoint of the side feed line set as a microstrip line.

17. The microwave Doppler detection antenna according to claim 12, wherein the radiating element further has at least one additional feeding connection point, wherein the additional feeding connection point is equivalent to forming another electrical feeding point of the radiating element, that is, the radiating element has one additional electrical feeding point and has two electrical feeding points.

18. The microwave Doppler detection antenna according to claim 17, wherein the newly added electrical feeding point is located at the zero potential line of the radiating element, that is, the two connecting lines between the two electrical feeding points and the physical center point of the radiating element are vertical.

19. The microwave Doppler detection antenna according to claim 18, wherein the feed source is arranged to output two excitation signals of the same phase in a powered state, wherein the radiating element is respectively connected to one of the excitation signals at the two electrical feeding points and has orthogonal polarization modes.

20. The microwave Doppler detection antenna according to claim 19, wherein the feed source is configured to output two excitation signals of the same phase via a power divider using one excitation signal.

21. The microwave Doppler detection antenna according to claim 18, wherein the feed source is arranged to output two excitation signals with a phase difference of 90 degrees in a powered state, wherein the radiating element is connected to one of the excitation signals at the two electrical feeding points respectively and has a circular polarization polarization mode.

22. The microwave Doppler detection antenna according to claim 21, wherein the feed source is configured to output two excitation signals with a phase difference of 90 degrees via a phase shifter using one excitation signal.

23. The microwave Doppler detection antenna according to claim 17, wherein the two electrical feeding points are located on both sides of the radiating element bounded by the zero potential line, and corresponding to one of the electrical feeding points, the physical center point of the radiating element and the connecting line sequentially connecting the other electrical feeding points have an angle greater than 90 degrees at the physical center point of the radiating element.

24. The microwave Doppler detection antenna according to claim 23, wherein the feed source is arranged to output two excitation signals of opposite phases in a powered state, and the radiating element is respectively connected to one of the excitation signals at the two electrical feeding points.

25. The microwave Doppler detection antenna according to claim 24, wherein a line connecting the two electrical feeding points passes through a physical center point of the radiating element.

26. The microwave Doppler detection antenna according to claim 25, wherein the number of the newly added feeding connection point is one.

27. The microwave Doppler detection antenna according to claim 26, wherein the newly added feeding connection point is implemented as a point feeding structure as a point on the radiating element for accessing a corresponding excitation signal.

28. The microwave Doppler detection antenna according to claim 25, wherein the number of the newly added feeding connection points is two, wherein the two newly added feeding connection points are symmetrically distributed along a straight line passing through the physical center point of the radiating element in the polarization direction of the radiating element.

29. The microwave Doppler detection antenna according to claim 25, wherein the number of the newly added feeding connection points is three, wherein among the three newly added feeding connection points, two of the feeding connection points are symmetrically distributed along a straight line passing through the physical center point of the radiating element in the polarization direction of the radiating element, and another of the feeding connection points is located at the midpoint of the line connecting the two feeding connection points.

30. The microwave Doppler detection antenna according to claim 12, wherein the radiation source substrate is a plate made of ceramic material.

31. The microwave Doppler detection antenna according to claim 30, wherein the radiation element is a conductive layer formed by curing the radiation source substrate using a silk-screen silver paste process.

32. A microwave Doppler detection antenna according to claim 31, wherein on the same side of a straight line passing through the physical center point of the radiation element in the polarization direction, the edge of the radiation element and the edge of the radiation source substrate remain aligned in the direction of the zero potential line within an error range of λ / 128.

33. A method for manufacturing a microwave Doppler detection antenna, characterized in that: The following steps are involved: (A) obtaining one or more layers of plate material having a dielectric constant greater than or equal to 7 and a thickness greater than or equal to λ / 32 within a 10% error range as a radiation source substrate, wherein λ is a wavelength parameter corresponding to a frequency parameter of the microwave Doppler detection antenna; (B) covering the radiation source substrate with a conductive layer as a radiation element; (C) defining a polarization direction and trimming the radiation source substrate with process parameters such that the edge of the radiation source substrate is aligned with the edge of the radiation element in the polarization direction within an error range of λ / 128; (D) defining at least one feeding connection point on the radiating element at a position having a distance greater than or equal to λ / 128 from the physical center point of the radiating element in the polarization direction, and forming a corresponding number of feeding holes on the radiation source substrate at positions corresponding to the feeding connection point and penetrating the radiation source substrate in a direction perpendicular to the radiating element; (E) inserting a metal feeding member into the feeding hole, and electrically connecting the radiating element to the metal feeding member; as well as (F) Using a conductive layer having an area larger than that of the radiation element as a reference ground, and fixing the radiation source substrate to the reference ground in a state where the projection of the radiation element is located within the reference ground and the radiation element and the reference ground are separated by the radiation source substrate.

34. The manufacturing method according to claim 33, wherein in the step (D), when there are multiple feed connection points, based on the equivalent principle that the two feed connection points connected to the excitation signals of the same phase whose midline passes through the physical center point of the radiating element are equivalent to one feed connection point at the midpoint of the line connecting the two feed connection points, and the two feed connection points connected to the excitation signals of different phases whose line passes through the physical center point of the radiating element are equivalent to one feed connection point at the midpoint of the line connecting the two feed connection points, the number and arrangement of the feed connection points are set to satisfy the ability to be equivalent to one feed connection point, and the corresponding feed point formed by the equivalent means is the electrical feed point of the radiating element, and the radiating element has one electrical feed point.

35. The manufacturing method according to claim 34 further comprises the steps of: (G) The direction of a line connecting the electrical feeding point on the radiation element to the physical center point of the radiation element is taken as the polarization direction of the radiation element, and the straight line on the radiation element passing through the physical center point of the radiation element and perpendicular to the polarization direction is taken as the zero potential line of the radiation element, at least one grounding hole is formed on the radiation source substrate at a position corresponding to the zero potential line of the radiation element and penetrating the radiation source substrate in a direction perpendicular to the radiation element, and a metal grounding component is inserted into the grounding hole, and the radiation element and the reference ground are electrically connected to the metal grounding component, so as to form a relationship in which the radiation element is electrically connected to the reference ground via the metal grounding component at the zero potential line.

36. The manufacturing method according to claim 35, wherein in the step (G), a grounding hole is formed by penetrating the radiation source substrate in a direction perpendicular to the radiation element at a position on the radiation source substrate corresponding to the physical center point of the radiation element.

37. The manufacturing method according to claim 36, wherein in the step (D), when there are multiple feed connection points, based on the equivalent principle that the two feed connection points whose midline passes through the physical center point of the radiating element and the two feed connection points whose line passes through the physical center point of the two feed connection points connected to the excitation signals of different phases are equivalent to one feed connection point whose midpoint is the middle point of the line connecting the two feed connection points, the number and arrangement of the feed connection points are set to satisfy the equivalent of two feed connection points, and the two feed connection points formed equivalently are the electrical feed points of the radiating element, and the radiating element has two electrical feed points.

38. The manufacturing method according to claim 37, wherein according to the step (D), a line sequentially connecting one of the electrical feeding points, the physical center point of the radiating element and another of the electrical feeding points has an angle greater than or equal to 90 degrees at the physical center point of the radiating element.

39. The manufacturing method according to claim 38, wherein according to the step (D), the two connecting lines between the two electrical feeding points and the physical center point of the radiating element are perpendicular to each other.

40. The manufacturing method according to claim 38, wherein the line connecting the two electrical feeding points passes through the physical center point of the radiating element.

41. The manufacturing method according to any one of claims 33 to 40, wherein in the step (B), silver paste is screen-printed on the radiation source substrate and cured to form a covering of the radiation element on the radiation source substrate.

42. The manufacturing method according to claim 41, wherein in the step (A), the radiation source substrate is a plate made of a ceramic material.

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