Doppler microwave probe with extended beam angle

Abstract

This invention discloses a phase-fed Doppler microwave detection device with extended beam angle. By phase-fed the Doppler microwave detection device, the beam angle of the microwave beam emitted by the Doppler microwave detection device is extended, thereby increasing the radiation area of ​​the microwave beam on the corresponding target detection surface and correspondingly reducing the penetration of the microwave beam into the ground and its absorption and reflection by the ground. This reduces the cost of the Doppler microwave detection device in practical applications and improves its detection accuracy and / or anti-interference performance in practical applications.

Description

Technical Field

[0001] This invention relates to the field of Doppler microwave detection, and particularly to a phase-fed Doppler microwave detection device with an extended beam angle. Background Technology

[0002] Microwave detection technology, as a crucial hub connecting people and objects, and objects themselves, possesses unique advantages in behavior and presence detection. It can transmit a microwave beam and receive the reflected echo formed by the beam's reflection from a corresponding object, without infringing on human privacy. Subsequently, based on the Doppler effect, a Doppler intermediate frequency (IF) signal corresponding to the frequency difference between the microwave beam and the reflected echo is generated through frequency mixing detection. This IF signal provides feedback on the object's motion. When applied to detecting human activity, including breathing and heartbeat, it can achieve intelligent interconnection between people and objects, thus possessing broad application prospects. However, due to the lack of effective means to control electromagnetic radiation, specifically methods for adjusting the shape of the electromagnetic radiation coverage area, its specific application... The current lack of methods for expanding the beam angle of corresponding microwave beams makes it difficult to control the actual detection space of existing microwave detection modules. This results in a mismatch between the actual detection space of existing microwave detection modules and the corresponding target detection space, such as partial overlap between the actual detection space and the target space. Consequently, the target detection space outside the actual detection space cannot be effectively detected, and / or there is environmental interference in the actual detection space outside the target detection space, including motion interference, electromagnetic interference, and self-excitation interference caused by electromagnetic shielding environment. This leads to poor detection accuracy and / or poor anti-interference performance of existing microwave detection modules. In other words, existing microwave detection modules have poor detection stability in practical applications and limited adaptability to different application scenarios.

[0003] Specifically, existing microwave detection modules mainly employ cylindrical and planar radiation source structures, and adopt a combined transmit / receive design based on miniaturization trends. However, due to the radiation dead zone and large sidelobes, cylindrical radiation source structures have poorer applicability compared to planar radiation source structures. Therefore, most existing microwave detection modules use planar radiation source structures. (Reference) Figures 1A to 1DAs shown, the structure of an existing microwave detection module employing a planar radiation source structure, the corresponding radiation pattern, and the radiation distribution scenario of the microwave detection module in a vertical detection application are illustrated. The microwave detection module includes a reference ground 10P and a planar radiation source 20P, wherein the planar radiation source 20P and the reference ground 10P are arranged alternately in a nearly parallel state. The radiation source 20P is provided with one and only one feed point 21P. When the radiation source 20P is fed at the feed point 21P, the radiation source 20P is polarized with the direction from the feed point 21P to the physical center point of the radiation source 20P as the polarization direction. Corresponding to the coupling between the radiation source 20P and the reference ground 10P, an internal electric field and an external electric field are established between the radiation source 20P and the reference ground 10P, with the edge of the radiation source 20P as the boundary. The radiation source 20P further establishes an edge electric field based on the self-coupling of its edge. The inner electric field is an electric field established between the radiation source 20P and the reference ground 10P in a direction simultaneously perpendicular to both the radiation source 20P and the reference ground 10P. The outer electric field is an electric field established between the radiation source 20P and the reference ground 10P in a direction not simultaneously perpendicular to both the radiation source 20P and the reference ground 10P. Based on the alternating propagation of the electric and magnetic fields, the outer electric field and the edge electric field can form a near-field radiation and further form a far-field radiation, thus generating a microwave beam. In other words, the energy and direction of the outer electric field and the edge electric field are directly related to the radiation gain and beam angle of the microwave beam. Based on the existing microwave detection module with a planar radiation source structure and its feeding structure, the beam angle of the corresponding microwave beam is limited to 70-80 degrees and is difficult to extend. This results in a narrow detection angle and a long detection distance for the microwave detection module. Therefore, in practical detection applications, specifically in the context of... Figure 1D In the illustrated vertical detection application, taking a common installation height of 3-5 meters above the ground as an example, the diameter of the microwave beam's radiating surface on the ground is only about 4-8 meters. Furthermore, half or more of the microwave beam's energy is wasted through penetration of the ground and absorption and reflection by the ground. The penetration behavior of the microwave beam through the ground and its reflection by the ground create an actual detection space outside the target detection space and generate self-excited interference. This results in poor detection accuracy and / or poor anti-interference performance of existing microwave detection modules, and this problem is exacerbated as the beam angle of the microwave beam decreases or the installation height decreases.

[0004] In other words, due to the limited installation height of the microwave detection module in practical applications, at the same installation height, the beam angle of the corresponding microwave beam emitted by the existing microwave detection module is relatively small. On the one hand, it is difficult to form a complete coverage of the corresponding detection surface, requiring the installation of multiple microwave detection modules, resulting in high costs. On the other hand, the radiation surface of each microwave detection module is relatively small, so in order to achieve a complete coverage of the corresponding detection surface, the installation distance between adjacent microwave detection modules is relatively close, which easily causes mutual interference between microwave detection modules. In addition, the defects of poor detection accuracy and / or poor anti-interference performance caused by the penetration behavior of the microwave beam through the ground and the reflection by the ground are further aggravated. If the beam angle of the microwave beam is extended, even a small extension can result in a significant increase in the corresponding radiating surface, which is of great importance. For example, if the installation height of the corresponding microwave detection module is h and the beam angle of the corresponding microwave beam is 2θ, then the estimated diameter d of the corresponding radiating surface satisfies d = 2h * tanθ. Based on an 80-degree beam angle, extending the beam angle to 100 degrees and 120 degrees respectively would increase the radiating surface diameter by approximately 42% and 106% at the same installation height. Therefore, how to extend the beam angle of the microwave beam is of great significance for reducing the cost of microwave detection technology in practical applications and improving its detection accuracy and / or anti-interference performance. Summary of the Invention

[0005] One object of the present invention is to provide a phase-fed Doppler microwave detection device with an extended beam angle, wherein by phase-fed the Doppler microwave detection device, the beam angle of the microwave beam emitted by the Doppler microwave detection device is extended, thereby increasing the area of ​​the radiation surface of the microwave beam on the corresponding target detection surface, and correspondingly reducing the penetration of the microwave beam into the ground and its absorption and reflection by the ground, thereby reducing the cost of the Doppler microwave detection device in practical applications and improving the detection accuracy and / or anti-interference performance of the Doppler microwave detection device in practical applications.

[0006] Another object of the present invention is to provide a phase-fed Doppler microwave detection device for extending the beam angle, wherein the Doppler microwave detection device includes a radiation source, wherein by phase-fed the radiation source, the energy of the edge electric field established by the radiation source based on its own coupling at its edge can be increased, thereby facilitating the extension of the beam angle of the microwave beam.

[0007] Another objective of this invention is to provide a phase-fed Doppler microwave detection device for extending the beam angle, wherein the radiation source is divided into four radiation source regions by two mutually perpendicular straight lines passing through the physical center point of the radiation source. By phase-fed the radiation source, any two adjacent radiation source regions can couple with each other based on a potential difference due to phase difference in the direction around the physical center point of the radiation source, so that the two radiation source regions are equivalent to a radiation element. Corresponding to the radiation source, four radiation elements are equivalently formed. In this way, the edge electric field formed by the coupling between the two radiation source regions based on each radiation element increases the energy of the edge electric field established by the radiation source based on its own coupling, thereby facilitating the extension of the beam angle of the microwave beam.

[0008] Another object of the present invention is to provide a phase-fed Doppler microwave detection device with extended beam angle, wherein the boundary line between the two radiation source regions of each radiation element is positioned based on the potential difference between the two radiation source regions approaching zero potential. That is, in the direction around the physical center point of the radiation source, the boundary line between any two adjacent radiation source regions approaches zero potential. Correspondingly, the four radiation source regions are named as the first radiation source region, the second radiation source region, the third radiation source region, and the fourth radiation source region in sequence around the physical center point of the radiation source. The radiation element formed by the equivalent formation of the first radiation source region and the second radiation source region is named the first radiation element, the radiation element formed by the equivalent formation of the second radiation source region and the third radiation source region is named the second radiation element, and the radiation element formed by the equivalent formation of the third radiation source region and the fourth radiation source region is named the third radiation element. The radiation element formed by the fourth radiation source region and the first radiation source region is the fourth radiation element. Then, in the two straight lines dividing the radiation source into four radiation source regions, the straight line separating the first radiation element and the third radiation element is the zero-potential line between the second and fourth radiation elements. The straight line separating the second and fourth radiation elements is also the zero-potential line between the first and third radiation elements. By differentially feeding the radiation source, the edge electric fields of the two radiation elements located on opposite sides of the same zero-potential line can be reversed, i.e., the edge electric fields of the first and third radiation elements are reversed, and the edge electric fields of the second and fourth radiation elements are reversed. This facilitates further expansion of the microwave beam in the directions of the two zero-potential lines.

[0009] Another object of the present invention is to provide a phase-fed Doppler microwave detection device with extended beam angle, wherein when two radiation source regions belonging to the same radiation element are fed, the phase difference between the feeds of the two radiation source regions is greater than or equal to π / 8, and when a pair of radiation source regions belonging to different radiation elements are fed, the phase difference between the feeds of the pair of radiation source regions is less than or equal to π / 3, so that by feeding at least two of the radiation source regions, a potential difference is generated between any two adjacent radiation source regions in the direction about the physical center point of the radiation source, thereby forming a phase-fed radiation source.

[0010] Another object of the present invention is to provide a phase-fed Doppler microwave detection device with extended beam angle, wherein the detection dead zone of the microwave beam is reduced or eliminated in the direction of the central axis of the radiation source, i.e., in the direction passing through the physical center point of the radiation source and perpendicular to the radiation source, by reducing the difference in the intensity of the edge electric field of the two radiating elements located on both sides of the same zero potential line. The detection dead zone is a concave space in the direction of the central axis of the radiation source formed by the microwave beam facing the radiation source, based on the opposite state of the edge electric fields of the two radiating elements. This is beneficial to balancing the beam angle and beam shape of the microwave beam, thereby improving the applicability of the phase-fed Doppler microwave detection device.

[0011] Another object of the present invention is to provide a phase-fed Doppler microwave detection device with extended beam angle, wherein the difference in edge electric field intensity between two radiation elements located on both sides of the same zero potential line is reduced by forming a phase difference between at least a pair of radiation source regions belonging to different radiation elements, thereby creating an offset of the actual zero potential point on the radiation source relative to the zero potential line. Specifically, the shape of at least a pair of radiation source regions belonging to different radiation elements is not symmetrical about any straight axis passing through the physical center point of the radiation source, or when there is a pair of radiation source regions belonging to different radiation elements being fed, the feeding phase difference between the pair of radiation source regions is not equal to 0.

[0012] Another objective of this invention is to provide a phase-fed Doppler microwave detection device with extended beam angle. Based on the mirror coupling principle of two radiation source regions of the same radiating element under fed conditions, by feeding at least two of the radiation source regions of the radiation source—for example, feeding two radiation source regions of the same radiating element with a feeding phase difference greater than or equal to π / 8, or feeding a pair of radiation source regions belonging to different radiating elements with a feeding phase difference less than or equal to π / 3—a potential difference can be generated between any two adjacent radiation source regions in the direction around the physical center point of the radiation source, thus forming phase-fed feeding of the radiation source. Therefore, it is simple, easy to implement, and low in cost. Furthermore, it can effectively form four radiating elements from one radiation source. This is advantageous compared to existing microwave detection modules, achieving comprehensive coverage of the corresponding detection surface based on a significant extension of the microwave beam angle without increasing the area of ​​the radiation source or the volume of the Doppler microwave detection device.

[0013] Another object of the present invention is to provide a phase-fed Doppler microwave detection device with extended beam angle, wherein the Doppler microwave detection device is designed as a transceiver unit, specifically designed as a receiving-fed transceiver unit for a pair of radiation source regions belonging to different radiating elements, so as to improve the basic sensitivity of the Doppler microwave detection device by superimposing the intensity of the corresponding echo signals based on the low phase difference of less than or equal to π / 3 between the pair of radiation source regions belonging to different radiating elements.

[0014] Another object of the present invention is to provide a phase-fed Doppler microwave detection device with extended beam angle, wherein at least two radiation source regions each have an electrical feed point, such that the electrical feed point feeds the corresponding radiation source region, wherein when two radiation source regions belonging to the same radiation element each have the electrical feed point, the angle between the lines connecting the electrical feed point of one radiation source region and the physical center point of the radiation source and the electrical feed point of the other radiation source region is greater than 10 degrees and less than 170 degrees. When a pair of radiation source regions of the radiation element have the electrical feed points respectively, the angle between the sequential lines connecting the electrical feed point of one radiation source region, the physical center point of the radiation source, and the electrical feed point of the other radiation source region is greater than or equal to 100 degrees. This is to prevent the two radiation source regions of the same radiation element from reaching potential balance based on phase fusion. Furthermore, based on the principle of mirror coupling, a potential difference is generated between any two adjacent radiation source regions in the direction around the physical center point of the radiation source, thereby forming a phase difference feed to the radiation source.

[0015] Another object of the present invention is to provide a phase-fed Doppler microwave detection device with extended beam angle, wherein the Doppler microwave detection device further includes a reference ground, wherein, in the state where the radiation source is fed, the radiation source is electrically connected to the zero potential line and the reference ground, so as to weaken or avoid the energy distribution imbalance between the radiation elements caused by the phase-fed nature of the radiation source in the corresponding shape design of the radiation source, thereby facilitating the balancing of the microwave beam shape and improving the stability of the Doppler microwave detection device.

[0016] Another object of the present invention is to provide a phase-fed Doppler microwave detection device with extended beam angle, wherein by phase-fed the radiation source, the edge electric fields of the two radiation elements located on both sides of the same zero potential line are reversed, thereby extending the microwave beam in the direction of the two zero potential lines. The arcing treatment of the edge of the radiation source in the direction of the line connecting the electrical feed point to the physical center point of the radiation source, such as forming an arc-shaped edge by chamfering, and the extension of the edge of the radiation source in the direction of the zero potential line, such as setting the edge of the radiation source to have a concave shape towards the physical center point of the radiation source in the direction of the zero potential line, or an outward convex shape away from the physical center point of the radiation source, thereby extending the edge of the radiation source in the direction of the zero potential line, can balance the edge electric field distribution of each radiation element and thus facilitate the equalization of the microwave beam shape.

[0017] Another objective of this invention is to provide a phase-fed Doppler microwave detection device with an extended beam angle, wherein by phase-fed the radiation source, the potential of the region of the radiation source corresponding to the zero potential line tends to zero potential, and the slotting process of the radiation source to the zero potential line will not destroy the phase-fed of the radiation source, and the radiation source can adapt to different shape requirements due to its diverse shape.

[0018] Another object of the present invention is to provide a phase-fed Doppler microwave detection device with extended beam angle, wherein the beam angle of the microwave beam is adjusted by adjusting the difference in intensity of the edge electric field of the two radiating elements located on both sides of the same zero potential line, thereby facilitating adaptation to different beam angle requirements.

[0019] Another object of the present invention is to provide a phase-fed Doppler microwave detection device with extended beam angle, wherein the radiation source is provided with multiple grounding points on the zero potential line, and the electrical connection between each of the grounding points and the reference ground is controllable. Thus, based on the control of the on / off connection between the electrical connection of the corresponding number and location of the grounding points and the reference ground, the offset of the actual zero potential point formed on the radiation source relative to the zero potential line is adjusted, correspondingly adjusting the intensity difference of the edge electric field of two radiation elements located on both sides of the same zero potential line, thereby achieving adjustment of the microwave beam angle.

[0020] Another object of the present invention is to provide a phase-fed Doppler microwave detection device with extended beam angle, wherein by setting the on / off state of the electrical connection between the grounding points and the reference ground in a corresponding number and position corresponding to the visualization interface graphic, the on / off control of the electrical connection between the grounding points and the reference ground in a corresponding number and position is realized based on the adjustment of the visualization interface graphic, so that when the vertical radiation surface of the microwave beam at a corresponding height is represented by the visualization interface graphic in a corresponding proportion, the vertical radiation surface of the microwave beam at a corresponding height can be visualized and adjusted based on the adjustment of the visualization interface graphic.

[0021] According to one aspect of the present invention, the present invention provides a phase-fed Doppler microwave detection device with extended beam angle, wherein the phase-fed Doppler microwave detection device with extended beam angle comprises:

[0022] A reference point; and

[0023] A radiation source is provided, wherein the radiation source and the reference ground are arranged at intervals, wherein the radiation source is divided into four radiation source regions by two mutually perpendicular straight lines passing through the physical center point of the radiation source, and in the direction around the physical center point of the radiation source, any two adjacent radiation source regions are taken as a radiation element, forming four radiation elements corresponding to the radiation source, wherein at least two radiation source regions each have an electrical feed point, so as to feed the radiation source by connecting an excitation signal of the corresponding phase to the electrical feed point, wherein the radiation source is set in a fed state, when two radiation source regions of the same radiation element are fed, the excitation signals connected to the corresponding two electrical feed points of the two radiation source regions have a phase difference greater than or equal to π / 8, and when a pair of radiation source regions belonging to different radiation elements are fed, the excitation signals connected to the corresponding two electrical feed points of the pair of radiation source regions have a phase difference less than or equal to π / 3, thereby forming a phase difference feed of the radiation source.

[0024] In one embodiment, when two radiation source regions of the same radiation element each have the electrical feed point, the angle between the sequential lines connecting the electrical feed point of one radiation source region, the physical center point of the radiation source, and the electrical feed point of the other radiation source region is greater than 10 degrees and less than 170 degrees.

[0025] In one embodiment, when there are a pair of radiation source regions belonging to different radiation elements, each having an electrical feed point, the angle between the sequential lines connecting the electrical feed point of one radiation source region, the physical center point of the radiation source, and the electrical feed point of the other radiation source region is greater than or equal to 100 degrees.

[0026] In one embodiment, the radiation source is configured to be fed, and when a pair of radiation source regions belonging to different radiation elements are fed, the excitation signals connected to the corresponding two electrical feed points of the pair of radiation source regions have a phase difference greater than 0.

[0027] In one embodiment, the radiation source is configured such that the shapes of at least one pair of radiation source regions belonging to different radiation elements are not symmetrical about any straight axis passing through the physical center point of the radiation source.

[0028] In one embodiment, two radiation source regions belonging only to the same radiation element each have the electrical feed point.

[0029] In one embodiment, the excitation signals connected to the two radiation source regions having the electrical feed points have a phase difference equal to π.

[0030] In one embodiment, the radiation source is configured to be rectangular to satisfy that the shapes of at least one pair of radiation source regions belonging to different radiation elements are not symmetrical about any straight axis passing through the physical center point of the radiation source.

[0031] In one embodiment, the radiation source is configured as a square or a circle, and is further configured with a groove design that is not symmetrical about any straight axis passing through the physical center point of the radiation source, so as to satisfy that the shapes of at least one pair of radiation source regions belonging to different radiation elements are not symmetrical about any straight axis passing through the physical center point of the radiation source.

[0032] In one embodiment, only a pair of radiation source regions belonging to different radiation elements have the electrical feed point.

[0033] In one embodiment, another pair of radiation source regions belonging to different radiating elements are configured to receive feeds, forming a transceiver integrated design for a phase-fed Doppler microwave detection device with extended beam angle.

[0034] In one embodiment, the four radiation source regions of the radiation source each have the electrical feed point.

[0035] In one embodiment, the edge of the radiation source is further arc-shaped along the line connecting the electrical feed point to the physical center point of the radiation source.

[0036] In one embodiment, the edge of the radiation source is chamfered along the line connecting the electrical feed point to the physical center point of the radiation source to form an arc-shaped edge treatment of the radiation source.

[0037] In one embodiment, two straight lines dividing the radiation source into four radiation source regions are used as two zero potential lines, wherein the radiation source is further configured in the direction of the zero potential lines to have an inwardly concave shape toward the physical center point of the radiation source, or an outwardly convex shape away from the physical center point of the radiation source.

[0038] In one embodiment, two straight lines dividing the radiation source into four radiation source regions are designated as two zero-potential lines, wherein, in the state where the radiation source is fed, the radiation source is electrically connected to the reference ground via the zero-potential lines.

[0039] In one embodiment, two straight lines dividing the radiation source into four radiation source regions are designated as two zero-potential lines. The radiation source is provided with multiple grounding points on the zero-potential lines. Each grounding point has a controllable electrical connection to a reference ground. Based on the on / off control of the electrical connection between the corresponding number and location of the grounding points and the reference ground, the beam angle of the microwave beam emitted by the phase-fed Doppler microwave detector with extended beam angle can be adjusted.

[0040] In one embodiment, the radiation source is provided with a pluggable probe at the grounding point to control the on / off state of the electrical connection between the grounding point and the reference ground based on the plugging of the corresponding probe.

[0041] In one embodiment, the radiation source is provided with a corresponding number of diodes between the grounding point and the reference ground, so as to control the on / off state of the electrical connection between the grounding point and the reference ground based on the on / off control of the diodes.

[0042] In one embodiment, the on / off state of the electrical connection between the grounding points and the reference ground of a corresponding number and location corresponds to a corresponding visual interface graphic, so as to realize the on / off control of the electrical connection between the grounding points and the reference ground of a corresponding number and location based on the adjustment of the visual interface graphic, wherein the visual interface graphic is set to represent the vertical radiation surface of the microwave beam at a corresponding height at a corresponding scale, so as to realize the visual adjustment of the vertical radiation surface of the microwave beam at a corresponding height based on the adjustment of the visual interface graphic.

[0043] According to another aspect of the present invention, the present invention also provides a phase-fed Doppler microwave detection device with extended beam angle, wherein the phase-fed Doppler microwave detection device with extended beam angle comprises:

[0044] A reference point; and

[0045] A radiation source is provided, wherein the radiation source and the reference ground are arranged at intervals, wherein the radiation source is divided into four radiation source regions by two mutually perpendicular straight lines passing through the physical center point of the radiation source, and in the direction around the physical center point of the radiation source, any two adjacent radiation source regions are taken as a radiation element, thereby forming four radiation elements corresponding to the radiation source, wherein at least two radiation source regions each have an electrical feed point, so as to form a feed to the radiation source by connecting an excitation signal of the corresponding phase to the electrical feed point, wherein the radiation source is set in a fed state, and there is a case where two radiation source regions of the same radiation element are fed, wherein the excitation signals connected to the corresponding two electrical feed points of the two radiation source regions have a phase difference greater than or equal to π / 8, thereby forming a phase difference feed to the radiation source.

[0046] In one embodiment, the radiation source is configured such that the shapes of at least one pair of radiation source regions belonging to different radiation elements are not symmetrical about any straight axis passing through the physical center point of the radiation source.

[0047] In one embodiment, in the two radiation source regions of the same radiation element that are fed, the angle between the sequential lines connecting the electrical feed point of one radiation source region and the physical center point of the radiation source and the electrical feed point of the other radiation source region is greater than 10 degrees and less than 170 degrees.

[0048] According to another aspect of the present invention, the present invention also provides a phase-fed Doppler microwave detection device with extended beam angle, wherein the phase-fed Doppler microwave detection device with extended beam angle comprises:

[0049] A reference point; and

[0050] A radiation source is provided, wherein the radiation source and the reference ground are arranged at intervals, wherein the radiation source is divided into four radiation source regions by two mutually perpendicular straight lines passing through the physical center point of the radiation source, and in the direction around the physical center point of the radiation source, any two adjacent radiation source regions are taken as a radiation element, thereby forming four radiation elements corresponding to the radiation source, wherein at least two radiation source regions each have an electrical feed point, so as to form a feed to the radiation source by connecting an excitation signal of the corresponding phase to the electrical feed point, wherein the radiation source is set in a fed state, and there is a case where a pair of radiation source regions belonging to different radiation elements are fed, wherein the excitation signals connected to the corresponding two electrical feed points of the pair of radiation source regions have a phase difference of less than or equal to π / 3, thereby forming a phase difference feed to the radiation source.

[0051] In one embodiment, in a pair of radiation source regions that are fed and belong to different radiation elements, the angle between the sequential lines connecting the electrical feed point of one radiation source region and the physical center point of the radiation source and the electrical feed point of the other radiation source region is greater than or equal to 100 degrees.

[0052] In one embodiment, in a pair of radiation source regions that are fed and belong to different radiation elements, the excitation signals connected to the corresponding two electrical feed points of the pair of radiation source regions have a phase difference greater than 0. Attached Figure Description

[0053] Figure 1A This is a schematic diagram of the existing microwave detection module that uses a planar radiation source structure.

[0054] Figure 1B This is a radiation pattern corresponding to the existing microwave detection module with a planar radiation source structure.

[0055] Figure 1C This is a two-dimensional cross-sectional view of the radiation pattern of a microwave detection module that corresponds to an existing planar radiation source structure.

[0056] Figure 1D This is a schematic diagram of the radiation distribution scenario of an existing microwave detection module with a planar radiation source structure in a vertical detection application.

[0057] Figure 2A This is a schematic diagram illustrating the structural principle of a phase-fed Doppler microwave detection device with an extended beam angle according to an embodiment of the present invention.

[0058] Figure 2B This is a radiation pattern of the phase-fed Doppler microwave detection device with extended beam angle according to the above embodiments of the present invention.

[0059] Figure 2C This is a two-dimensional cross-sectional view of the radiation pattern of the phase-fed Doppler microwave detector with extended beam angle according to the above embodiments of the present invention.

[0060] Figure 3A This is a schematic diagram illustrating the structural principle of the phase-fed Doppler microwave detection device with extended beam angle according to a modified embodiment of the above-described embodiments of the present invention.

[0061] Figure 3B This is a radiation pattern of the phase-fed Doppler microwave detection device with extended beam angle according to the above-described modified embodiment of the present invention.

[0062] Figure 3C This is a two-dimensional cross-sectional view of the radiation pattern of the phase-fed Doppler microwave detector with extended beam angle according to the above-described modified embodiment of the present invention.

[0063] Figure 4A This is a schematic diagram illustrating the structural principle of the phase-fed Doppler microwave detection device with an extended beam angle, according to another modified embodiment of the above-described embodiments of the present invention.

[0064] Figure 4B This is a radiation pattern of the phase-fed Doppler microwave detection device with extended beam angle according to the above-described modified embodiment of the present invention.

[0065] Figure 4C This is a two-dimensional cross-sectional view of the radiation pattern of the phase-fed Doppler microwave detector with extended beam angle according to the above-described modified embodiment of the present invention.

[0066] Figure 5A This is a schematic diagram illustrating the structural principle of the phase-fed Doppler microwave detection device with an extended beam angle, according to another modified embodiment of the above-described embodiments of the present invention.

[0067] Figure 5B This is a radiation pattern of the phase-fed Doppler microwave detection device with extended beam angle according to the above-described modified embodiment of the present invention.

[0068] Figure 5C This is a two-dimensional cross-sectional view of the radiation pattern of the phase-fed Doppler microwave detector with extended beam angle according to the above-described modified embodiment of the present invention.

[0069] Figure 6A This is a schematic diagram illustrating the structural principle of the phase-fed Doppler microwave detection device with an extended beam angle, according to another modified embodiment of the above-described embodiments of the present invention.

[0070] Figure 6BThis is a radiation pattern of the phase-fed Doppler microwave detection device with extended beam angle according to the above-described modified embodiment of the present invention.

[0071] Figure 6C This is a two-dimensional cross-sectional view of the radiation pattern of the phase-fed Doppler microwave detector with extended beam angle according to the above-described modified embodiment of the present invention.

[0072] Figure 7A This is a schematic diagram illustrating the structural principle of the phase-fed Doppler microwave detection device with an extended beam angle, according to another modified embodiment of the above-described embodiments of the present invention.

[0073] Figure 7B This is a radiation pattern of the phase-fed Doppler microwave detection device with extended beam angle according to the above-described modified embodiment of the present invention.

[0074] Figure 7C This is a two-dimensional cross-sectional view of the radiation pattern of the phase-fed Doppler microwave detector with extended beam angle according to the above-described modified embodiment of the present invention.

[0075] Figure 8A This is a schematic diagram illustrating the structural principle of the phase-fed Doppler microwave detection device with an extended beam angle, according to another modified embodiment of the above-described embodiments of the present invention.

[0076] Figure 8B This is a radiation pattern of the phase-fed Doppler microwave detection device with extended beam angle according to the above-described modified embodiment of the present invention.

[0077] Figure 8C This is a two-dimensional cross-sectional view of the radiation pattern of the phase-fed Doppler microwave detector with extended beam angle according to the above-described modified embodiment of the present invention.

[0078] Figure 9A This is a schematic diagram illustrating the structural principle of the phase-fed Doppler microwave detection device with an extended beam angle, according to another modified embodiment of the above-described embodiments of the present invention.

[0079] Figure 9B This is a radiation pattern of the phase-fed Doppler microwave detection device with extended beam angle according to the above-described modified embodiment of the present invention.

[0080] Figure 9C This is a two-dimensional cross-sectional view of the radiation pattern of the phase-fed Doppler microwave detector with extended beam angle according to the above-described modified embodiment of the present invention.

[0081] Figure 10AThis is a schematic diagram illustrating the structural principle of the phase-fed Doppler microwave detection device with an extended beam angle, according to another modified embodiment of the above-described embodiments of the present invention.

[0082] Figure 10B This is a radiation pattern of the phase-fed Doppler microwave detection device with extended beam angle according to the above-described modified embodiment of the present invention.

[0083] Figure 10C This is a two-dimensional cross-sectional view of the radiation pattern of the phase-fed Doppler microwave detector with extended beam angle according to the above-described modified embodiment of the present invention.

[0084] Figure 11A This is a schematic diagram illustrating the structural principle of the phase-fed Doppler microwave detection device with an extended beam angle, according to another modified embodiment of the above-described embodiments of the present invention.

[0085] Figure 11B This is a schematic diagram illustrating the application of the phase-fed Doppler microwave detection device with extended beam angle according to the above-described modified embodiment of the present invention. Detailed Implementation

[0086] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0087] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0088] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0089] Referring to the accompanying drawings of this invention Figures 2A to 2CAs shown, the structural principle of a phase-fed Doppler microwave detector with an extended beam angle according to an embodiment of the present invention, the corresponding radiation pattern, and a two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detector are illustrated. The Doppler microwave detector includes a reference ground 10 and a radiation source 20, wherein the radiation source 20 and the reference ground 10 are spaced apart. The radiation source 20 is divided into four radiation source regions 200 by two mutually perpendicular straight lines passing through the physical center point of the radiation source 20. Specifically, the four radiation source regions are named sequentially around the physical center point of the radiation source 20 as the first radiation source region 201, the second radiation source region 202, the third radiation source region 203, and the fourth radiation source region 204. The radiation source region 200 is further enhanced by feeding at least two of the radiation source regions 200, specifically around the physical center point of the radiation source 20. Among the four radiation source regions 200 arranged sequentially in the direction of the physical center point of the radiation source 20, when two adjacent radiation source regions 200 in the direction of the physical center point of the radiation source 20 are fed, such as the first radiation source region 201 and the second radiation source region 202 being fed, or the second radiation source region 202 and the third radiation source region 203 being fed, or the third radiation source region 203 and the fourth radiation source region 204 being fed, or the fourth radiation source region 204 and the first radiation source region 201 being fed, the two radiation sources... The feed phase difference of region 200 is greater than or equal to π / 8, and when there is a pair of radiation source regions 200 that are fed alternately around the physical center point of the radiation source 20, such as the first radiation source region 201 and the third radiation source region 203 being fed, or the second radiation source region 202 and the fourth radiation source region 204 being fed, the feed phase difference of the pair of radiation source regions 200 is less than or equal to π / 3, thus forming a phase difference between any two adjacent radiation source regions 200 in the direction around the physical center point of the radiation source 20, thereby forming a phase difference between the radiation source 20 and the radiation source 20. The phase difference feeding corresponds to the establishment of a potential difference between any two adjacent radiation source regions 200 based on the phase difference in the direction around the physical center point of the radiation source 20, which enables them to couple with each other so that the two radiation source regions 200 are equivalent to a radiation element 210. Correspondingly, the radiation source 20 is equivalent to forming four radiation elements 210. In this way, the edge electric field formed by the coupling between the two radiation source regions 200 based on each radiation element 210 increases the energy of the edge electric field established by the radiation source 20 based on its own coupling, thereby facilitating the expansion of the microwave beam emitted by the Doppler microwave detection device.

[0090] In other words, when two radiation source regions 200 of the same radiation element 210 are fed, the phase difference between the two radiation source regions 200 is greater than or equal to π / 8, and when a pair of radiation source regions 200 belonging to different radiation elements 210 are fed, the phase difference between the pair of radiation source regions 200 is less than or equal to π / 3. Thus, by feeding at least two radiation source regions 200 of the radiation source 20, a phase difference is formed between any two adjacent radiation source regions 200 in the direction around the physical center point of the radiation source 20, thereby forming a phase difference feed of the radiation source 20.

[0091] Furthermore, the boundary line between the two radiation source regions 200 of each radiation element 210 is positioned based on the potential difference between the two radiation source regions 200 approaching zero potential. That is, in the direction around the physical center point of the radiation source 20, the boundary line between any two adjacent radiation source regions 200 approaches zero potential. Correspondingly, the radiation element 210 formed by the first radiation source region 201 and the second radiation source region 202 is named the first radiation element 211, the radiation element 210 formed by the second radiation source region 202 and the third radiation source region 203 is named the second radiation element 212, the radiation element 210 formed by the third radiation source region 203 and the fourth radiation source region 204 is named the third radiation element 213, and the radiation element 210 formed by the fourth radiation source region 204 and the first radiation source region 201 is named the fourth radiation element 214. In the two straight lines that divide the radiation source 20 into four radiation source regions 200, the straight line that separates the first radiation element 211 and the third radiation element 213 in the radiation source 20 is the zero potential line of the second radiation element 212 and the fourth radiation element 214, and the straight line that separates the second radiation element 212 and the fourth radiation element 214 is the zero potential line of the first radiation element 211 and the third radiation element 213. By differentially feeding the radiation source 20, it is possible to form a state in which the edge electric fields of the two radiation elements 210 located on both sides of the same zero potential line are opposite, that is, to form a state in which the edge electric fields of the first radiation element 211 and the third radiation element 213 are opposite, and the edge electric fields of the second radiation element 212 and the fourth radiation element 214 are opposite, which is beneficial to further expand the microwave beam in the direction of the two zero potential lines.

[0092] It is worth mentioning that by phase-differential feeding of the radiation source 20, the beam angle of the microwave beam emitted by the Doppler microwave detection device is expanded, thereby increasing the area of ​​the radiation surface of the microwave beam on the corresponding target detection surface, and correspondingly reducing the penetration of the microwave beam into the ground and its absorption and reflection by the ground. This reduces the cost of the Doppler microwave detection device in practical applications and improves the detection accuracy and / or anti-interference performance of the Doppler microwave detection device in practical applications.

[0093] Furthermore, at least two of the radiation source regions 200 each have an electrical feed point 2001, so as to feed the corresponding radiation source region 200 by connecting a corresponding excitation signal to the electrical feed point 2001. The phase difference of the feed of the two radiation source regions 200 is the phase difference of the excitation signal connected to the two radiation source regions 200 at the electrical feed point 2001. That is, when two radiation source regions 200 belonging to the same radiation element 210 are fed, the excitation signals connected to the two radiation source regions 200 at the two electrical feed points 2001 have a phase difference greater than or equal to π / 8. When a pair of radiation source regions 200 belonging to different radiation elements 210 are fed, the excitation signals connected to the pair of radiation source regions 200 at the two electrical feed points 2001 have a phase difference less than or equal to π / 3. This forms a phase difference feed of the radiation source 20.

[0094] Specifically, when two radiation source regions 200 belonging to the same radiation element 210 each have an electrical feed point 2001, the angle between the sequentially connected line of the electrical feed point 2001 of one radiation source region 200, the physical center point of the radiation source 20, and the electrical feed point 2001 of the other radiation source region 200 is greater than 10 degrees and less than 170 degrees. When a pair of radiation source regions 200 belonging to different radiation elements 210 each have an electrical feed point 2001, one of the radiation source regions... The angle between the sequential lines connecting the electrical feed point 2001 of the radiation source 20 and the physical center point of the radiation source 20, and the electrical feed point 2001 of another radiation source region 200, is greater than or equal to 100 degrees. This is to prevent the two radiation source regions 200 of the same radiation element 210 from reaching potential balance based on phase fusion. Furthermore, based on the principle of mirror coupling, a potential difference is generated between any two adjacent radiation source regions 200 in the direction around the physical center point of the radiation source 20, thereby forming a phase difference feed to the radiation source 20.

[0095] Specifically, in this embodiment of the present invention, the four radiation source regions 200 of the radiation source 20 each have an electrical feed point 2001, wherein the excitation signals of two radiation source regions 200 of the same radiation element 210 connected to the two electrical feed points 2001 have a phase difference equal to π, and the excitation signals of two radiation source regions 200 belonging to different radiation elements 210 connected to the two electrical feed points 2001 have the same phase and a phase difference equal to 0.

[0096] It is worth mentioning that, by differentially feeding the radiation source 20, the potential of the region of the radiation source corresponding to the zero potential line tends to zero potential. Therefore, the slotting process of the radiation source 20 at the zero potential line will not destroy the differential feeding of the radiation source 20, and the radiation source 20 has a variety of shapes and can adapt to different shape requirements.

[0097] Specifically, refer to the accompanying drawings of the specification of this invention. Figures 3A to 3C The diagram illustrates the structural principle of the Doppler microwave detection device according to a modified embodiment of the above-described embodiment of the present invention, along with the corresponding radiation pattern and a two-dimensional cross-sectional view of the radiation pattern along the radiation direction of the Doppler microwave detection device. The diagram is shown in contrast to... Figure 2A The structural principle of the Doppler microwave detection device shown in this modified embodiment of the invention is such that the radiation source 20 is slotted at the zero potential line, thus relative to... Figure 2A The first radiation source region 201, the second radiation source region 202, the third radiation source region 203, and the fourth radiation source region 204 are integrally formed into a single structure. In this modified embodiment of the present invention, the first radiation source region 201, the second radiation source region 202, the third radiation source region 203, and the fourth radiation source region 204 are separated along the zero potential line.

[0098] Further comparison with Figure 2B and Figure 2C The radiation pattern of the Doppler microwave detection device and the two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detection device, as shown in the schematic diagram, indicate that in this modified embodiment of the present invention, when the radiation source 20 is slotted at the zero potential line, the beam shape and beam angle of the microwave beam emitted by the Doppler microwave detection device can be maintained relative to the Doppler microwave detection device of the above embodiment. That is, the slotting of the radiation source 20 at the zero potential line will not destroy the phase difference feed of the radiation source 20, and the radiation source 20 has a variety of shapes and can adapt to different shape requirements.

[0099] It is worth mentioning that, in the state where the four radiation source regions 200 of the radiation source 20 each have an electrical feed point 2001, and the excitation signals connected to the two electrical feed points 2001 of two radiation source regions 200 belonging to the same radiation element 210 have a phase difference greater than or equal to π / 8, and the excitation signals connected to the two electrical feed points 2001 of a pair of radiation source regions 200 belonging to different radiation elements 210 have a phase difference less than or equal to π / 3, even if the shape of at least a pair of radiation source regions 200 belonging to different radiation elements 210 is symmetrical about a straight line passing through the physical center point of the radiation source 20, such as when the radiation source 20 is set as a square or a circle, phase difference feeding of the radiation source 20 can still be formed.

[0100] Specifically, refer to the accompanying drawings of the specification of this invention. Figures 4A to 4C The diagram illustrates the structural principle of the Doppler microwave detection device according to a modified embodiment of the above-described embodiment of the present invention, along with the corresponding radiation pattern and a two-dimensional cross-sectional view of the radiation pattern along the radiation direction of the Doppler microwave detection device. The difference lies in the fact that... Figure 2A The structural principle of the Doppler microwave detection device shown is as follows: Figure 2A In the illustrated Doppler microwave detection device, the radiation source 20 is set as a rectangle, while in this modified embodiment of the present invention, the radiation source 20 is set as a circle.

[0101] Further comparison with Figure 2B and Figure 2C The diagram shows the radiation pattern of the Doppler microwave detection device and a two-dimensional cross-sectional view of the radiation pattern along the radiation direction of the Doppler microwave detection device. It can be seen that in this modified embodiment of the invention, with the radiation source 20 set in a circular state, the beam shape and beam angle of the microwave beam emitted by the Doppler microwave detection device can be maintained relative to the Doppler microwave detection device of the above embodiment. That is, the four radiation source regions 200 of the radiation source 20 each have an electrical feed point 2001, and belong to the same radiation source region 20 ... The excitation signals connected to the two radiation source regions 200 of the radiator 210 at the two electrical feed points 2001 have a phase difference greater than or equal to π / 8, and the excitation signals connected to the two electrical feed points 2001 of a pair of radiation source regions 200 belonging to different radiators 210 have a phase difference less than or equal to π / 3. The shape of at least one pair of radiation source regions 200 belonging to different radiators 210 is designed to be axially symmetrical along a straight line passing through the physical center point of the radiation source 20, which will not disrupt the phase difference feeding of the radiation source 20.

[0102] It is also worth mentioning that, based on the principle of mirror coupling between one radiation source region 200 of the same radiation element 210 and another radiation source region 200 in a fed state, by feeding a pair of radiation source regions 200 belonging to different radiation elements 210, specifically feeding a pair of radiation source regions 200 belonging to different radiation elements 210 with a feeding phase difference of less than or equal to π / 3, a potential difference can be generated between any two adjacent radiation source regions 200 in the direction around the physical center point of the radiation source 20, thus forming a phase difference feeding of the radiation source 20. Therefore, it is simple, easy to implement, and low in cost. It can also form four radiation elements 210 equivalently from one radiation source 20. This is beneficial for achieving full coverage of the corresponding detection surface by significantly expanding the beam angle of the microwave beam, without increasing the area of ​​the radiation source 20 or the volume of the Doppler microwave detection device, compared to existing microwave detection modules.

[0103] Specifically, refer to the accompanying drawings of the specification of this invention. Figures 5A to 5C The diagram illustrates the structural principle of the Doppler microwave detection device according to another modified embodiment of the above-described embodiments of the present invention, along with the corresponding radiation pattern and a two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detection device. The diagram is shown in contrast to... Figure 4A The schematic diagram of the Doppler microwave detection device with the circular radiation source 20 illustrates the structural principle of the device. In this modified embodiment of the invention, only a pair of radiation source regions 200 belonging to different radiation elements 210 have electrical feed points 2001, wherein the excitation signals connected to the two radiation source regions 200 at the two electrical feed points 2001 have the same phase and a phase difference of 0. Thus, based on the mirror coupling principle of one radiation source region 200 of the same radiation element 210 in a fed state with the other radiation source region 200, a potential difference is generated between any two adjacent radiation source regions 200 in the direction around the physical center point of the radiation source 20, thereby forming a phase difference feed to the radiation source 20.

[0104] Further comparison with Figure 4B and Figure 4CThe radiation pattern of the Doppler microwave detector and a two-dimensional cross-sectional view of the radiation pattern along the radiation direction of the Doppler microwave detector, as shown in the schematic diagram, indicate that in this modified embodiment of the invention, when a pair of radiation source regions 200 belonging to different radiating elements 210 are fed with a feed phase difference equal to 0, the beamform and beam angle of the microwave beam emitted by the Doppler microwave detector can be maintained relative to the Doppler microwave detector of the above embodiment, i.e., based on the same radiating element. The principle of mirror coupling between one of the radiation source regions 200 and the other radiation source region 200 in the fed state of 210 is to feed a pair of radiation source regions 200 belonging to different radiation elements 210, specifically by feeding a pair of radiation source regions 200 belonging to different radiation elements 210 with a feeding phase difference of less than or equal to π / 3. This can generate a potential difference between any two adjacent radiation source regions 200 in the direction around the physical center point of the radiation source 20, thereby forming a phase difference feeding of the radiation source 20.

[0105] It is also worth mentioning that, based on the principle of mirror coupling between one of the radiation source regions 200 of the same radiation element 210 and another radiation source region 200 in a fed state, when the shapes of at least one pair of radiation source regions 200 belonging to different radiation elements 210 are not symmetrical about any straight axis passing through the physical center point of the radiation source 20, by feeding the two radiation source regions 200 of the same radiation element 210, specifically by feeding the two radiation source regions 200 of the same radiation element 210 with a feeding phase difference greater than or equal to π / 8, it is also possible to generate a potential difference between any two adjacent radiation source regions 200 in the direction around the physical center point of the radiation source 20, thereby forming a phase difference feeding of the radiation source 20.

[0106] Specifically, refer to the accompanying drawings of the specification of this invention. Figures 6A to 6C The diagram illustrates the structural principle of the Doppler microwave detection device according to another modified embodiment of the above-described embodiments of the present invention, along with the corresponding radiation pattern and a two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detection device. The diagram is shown in contrast to... Figure 2AThe structural principle of the Doppler microwave detection device with the rectangular radiation source 20 is illustrated in this modified embodiment of the invention. Only the two radiation source regions 200 of the same radiation element 210 have electrical feed points 2001, wherein the excitation signals connected to the two radiation source regions 200 at the two electrical feed points 2001 have a phase difference equal to π. Thus, in a state where the shape of at least one pair of radiation source regions 200 belonging to different radiation elements 210 is not symmetrical about any straight axis passing through the physical center point of the radiation source 20, based on the mirror coupling principle of one radiation source region 200 of the same radiation element 210 with the other radiation source region 200 in the fed state, a potential difference is generated between any two adjacent radiation source regions 200 in the direction around the physical center point of the radiation source 20, thereby forming a phase difference feed to the radiation source 20.

[0107] In particular, compared to Figure 2B and Figure 2C The diagram shows the radiation pattern of the Doppler microwave detection device and a two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detection device. In this modified embodiment of the invention, the dead zone of the microwave beam is reduced, wherein the detection dead zone is based on the state of the opposing edge electric fields of the two radiating elements 210 on both sides of the same zero potential line, in the concave space formed by the microwave beam towards the radiation source in the direction of the central axis of the radiation source, i.e., passing through the physical center point of the radiation source 20 and perpendicular to the radiation source 20.

[0108] In other words, when the shapes of at least one pair of radiation source regions 200 belonging to different radiation elements 210 are not symmetrical about any straight line axis passing through the physical center point of the radiation source 20, by simply feeding the two radiation source regions 200 of the same radiation element 210 with a feeding phase difference greater than or equal to π / 8, it is possible to achieve the same effect based on the mirror coupling principle between one radiation source region 200 and the other radiation source region 200 in the fed state, in the direction around the physical center point of the radiation source 20. A potential difference is generated between any two adjacent radiation source regions 200 to form a phase-fed radiation source 20. At the same time, based on the fact that the shapes of at least one pair of radiation source regions 200 belonging to different radiation elements 210 are not symmetrical about any straight line axis passing through the physical center point of the radiation source 20, the difference in edge electric field intensity between the two radiation elements 210 located on both sides of the same zero potential line is reduced, which correspondingly reduces the detection dead zone of the microwave beam. This is beneficial to balancing the beam angle and beam shape of the microwave beam, thereby improving the applicability of the phase-fed Doppler microwave detection device.

[0109] Detailed comparison Figures 5A to 5C Referring to the accompanying drawings of this invention Figures 7A to 7C The structural principle of the Doppler microwave detection device according to another modified embodiment of the above embodiments of the present invention, the radiation pattern corresponding to the structure, and the two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detection device are respectively illustrated, wherein compared with Figure 5A The schematic diagram illustrates the structural principle of the Doppler microwave detection device with the circular radiation source 20. In this modified embodiment of the invention, the radiation source 20 corresponds to... Figure 2A It is set to a rectangle and corresponds to Figure 5A With a potential difference of 0 at the corresponding electrical feed point 2001, only a pair of radiation source regions 200 belonging to different radiation elements 210 are fed. This is in contrast to... Figure 5B and Figure 5C The radiation pattern of the Doppler microwave detection device and the two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detection device show that, based on the design that the shape of at least one pair of radiation source regions 200 belonging to different radiation elements 210 is not symmetrical about any straight line axis passing through the physical center point of the radiation source 20, the difference in the intensity of the edge electric field of the two radiation elements 210 on both sides of the same zero potential line can be reduced, thereby correspondingly reducing the detection dead zone of the microwave beam.

[0110] Therefore, by reducing the difference in edge electric field intensity between two radiating elements located on opposite sides of the same zero potential line, such as by setting the shape of at least one pair of radiation source regions 200 belonging to different radiating elements 210 to be non-symmetric about any straight axis passing through the physical center point of the radiation source 20, the detection dead zone of the microwave beam can be reduced or eliminated, thereby facilitating the balance of the beam angle and beam shape of the microwave beam, and thus improving the applicability of the phase-fed Doppler microwave detection device.

[0111] As a further example, refer to the accompanying drawings of the specification of this invention. Figures 8A to 8CAs shown, the structural principle of the Doppler microwave detection device according to another modified embodiment of the above-described embodiment of the present invention, the radiation pattern corresponding to the structure, and the two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detection device are respectively illustrated. In this modified embodiment of the present invention, the radiation source 20 is configured based on a slot design of a square structure. In two pairs of radiation source regions 200 belonging to different radiation elements 210, the shape of one pair of radiation source regions 200 is not symmetrical about any straight line axis passing through the physical center point of the radiation source, and the shape of the other pair of radiation source regions 200 is symmetrical about one of the straight lines passing through the physical center point of the radiation source. When feeding any pair of radiation source regions 200 belonging to different radiation elements 210 with a potential difference of 0 at the corresponding electrical feed point 2001, the same corresponding... Figure 8B and Figure 8C The radiation pattern and the two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detection device show a significant reduction or elimination of the detection dead zone of the microwave beam. That is, by setting the shape of at least one pair of radiation source regions 200 belonging to different radiation elements 210 to be non-symmetric about any straight axis passing through the physical center point of the radiation source 20, the detection dead zone of the microwave beam can be reduced or eliminated.

[0112] Preferably, to further reduce or eliminate the detection dead zone of the microwave beam, when feeding a pair of radiation source regions 200 belonging to different radiation elements 210 with a feed phase difference of less than or equal to π / 3, the feed phase difference of the pair of radiation source regions 200 is not equal to 0. Specifically, refer to the accompanying drawings of the specification of this invention. Figures 9A to 9C As shown, the structural principle of the Doppler microwave detection device according to another modified embodiment of the above-described embodiment of the present invention, the radiation pattern corresponding to the structure, and the two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detection device are respectively illustrated, wherein compared with Figure 5A The schematic diagram illustrates the structural principle of a Doppler microwave detection device that feeds a pair of radiation source regions 200 belonging to different radiating elements 210 at the corresponding electrical feed point 2001 with a potential difference of 0. In this modified embodiment of the invention, the pair of radiation source regions 200 belonging to different radiating elements 210 are fed at the corresponding electrical feed point 2001 with a potential difference not equal to 0. Specifically, the pair of radiation source regions 200 belonging to different radiating elements 210 are fed at the corresponding electrical feed point 2001 with a potential difference of π / 60. This corresponds to... Figure 9B and Figure 9C The radiation pattern and a two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detection device, the detection dead zone of the microwave beam relative to Figure 5B and Figure 5C The detection dead zone of the microwave beam can be significantly reduced, i.e., when a pair of radiation source regions 200 belonging to different radiation elements 210 are fed with a feed phase difference of less than or equal to π / 3, by setting the feed phase difference of the pair of radiation source regions 200 to be non-zero.

[0113] It is worth mentioning that the Doppler microwave detection device can be designed as a transceiver unit, specifically in a state where a feed phase difference of less than or equal to π / 3 is used to feed a pair of radiation source regions 200 belonging to different radiating elements 210. Preferably, the Doppler microwave detection device is designed as a transceiver unit to receive and feed another pair of radiation source regions 200 belonging to different radiating elements 210. This is to facilitate the superposition of the intensity of the corresponding echo signals based on the low phase difference of less than or equal to π / 3 between the pair of radiation source regions 200 belonging to different radiating elements 210, thereby improving the basic sensitivity of the Doppler microwave detection device.

[0114] Furthermore, in these embodiments of the present invention, by differentially feeding the radiation source 20, it is possible to form a state in which the edge electric fields of the two radiation elements 210 located on both sides of the same zero potential line are opposite, thereby forming an extension of the microwave beam in the direction of the two zero potential lines. In the direction of the line connecting the electrical feed point 2001 to the physical center point of the radiation source 20, the arcuate treatment of the edge of the radiation source 20, such as forming an arc-shaped edge shape by chamfering, and the extension of the edge of the radiation source 20 in the direction of the zero potential line, such as setting the edge of the radiation source 20 to have an inward shape towards the physical center point of the radiation source 20 in the direction of the zero potential line, or an outward shape away from the physical center point of the radiation source 20, thereby forming an extension of the edge of the radiation source 20 in the direction of the zero potential line, can balance the edge electric field distribution of each radiation element 210 in the corresponding direction, which is beneficial to equalizing the shape of the microwave beam.

[0115] Specifically, refer to the accompanying drawings of the specification of this invention. Figures 10A to 10C As shown, the structural principle of the Doppler microwave detection device according to another modified embodiment of the above-described embodiment of the present invention, the radiation pattern corresponding to the structure, and the two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detection device are respectively illustrated, wherein compared with Figure 6A The schematic diagram illustrates the structural principle of the Doppler microwave detection device with a rectangular radiation source 20. In this modified embodiment of the invention, along the line connecting the electrical feed point 2001 to the physical center point of the radiation source 20, the edge of the radiation source 20 is rounded, specifically formed into a rounded edge shape by chamfering. This contrasts with... Figure 6B and Figure 6C The diagram shows the radiation pattern of the Doppler microwave detection device and a two-dimensional cross-sectional view of the radiation pattern in the radiation direction of the Doppler microwave detection device. The microwave beam of the Doppler microwave detection device is maintained and expanded, while the shape of the microwave beam is simultaneously balanced, that is, the vertical radiation surface of the microwave beam at the corresponding height is more circular, which helps to improve the applicability of the Doppler microwave detection device.

[0116] It is worth mentioning that, in these embodiments of the present invention, the introduction of the electrical feed point 2001 defines the electrical equivalent feed position of the radiation source region 200. The physical feed structure corresponding to the electrical feed point 2001 is diverse, and the physical feed structure corresponding to the electrical feed point 2001 of different radiation source regions 200 is not limited to the same. Therefore, the circuit design of the corresponding Doppler microwave detection device is flexible and diverse and can adapt to different layout requirements.

[0117] Specifically, when a corresponding excitation signal is connected to a feed connection point on the radiation source region 200, the electrical feed point 2001 is located at the feed connection point. When multiple feed connection points on the radiation source region 200 are connected to the corresponding excitation signal, based on the principle that if the midline of the line connecting two feed connection points connected to the corresponding excitation signal passes through the physical center point of the radiation source 20, then these two feed connection points are equivalent to one feed connection point at the midpoint of the line connecting these two feed connection points. The arrangement of the feed connection points is set to satisfy the condition that it can be equivalent to one feed connection point. Therefore, the electrical feed point 2001 is equivalently located at this feed connection point. That is, the description of the electrical connection relationship and position of the electrical feed point 2001 is a limitation on the electrical connection relationship and position arrangement of the physical feed connection points. The specific quantity, location, and feeding structure are flexible and varied. In the state of a point-feeding (probe-feeding) structure corresponding to a feeding connection point, the feeding connection point is a point on the radiation source region 200 where the corresponding excitation signal is connected. In the state of a microstrip feeding structure corresponding to a feeding connection point, the radiation source region 200 is connected to the corresponding excitation signal via a microstrip feed line, and the feeding connection point is a point on the radiation source region 200 electrically connected to the microstrip feed line. In the state of a side-feeding structure corresponding to a feeding connection point, the radiation source region 200 is connected to the corresponding excitation signal via a side feed line, where the side feed line is a microstrip line adjacent to and parallel to the straight edge of the radiation source region 200, and the feeding connection point is the midpoint of the side feed line that is set as a microstrip line. Therefore, the physical feeding structures corresponding to the feeding connection points are diverse, and the physical feeding structures corresponding to the electrical feeding points 2001 of different radiation source regions 200 are not limited to being the same.

[0118] In particular, in these embodiments of the invention, wherein the radiation source 20 is fed, the radiation source 20 is preferably electrically connected to the reference ground 10 at the zero potential line, so as to weaken or avoid the energy distribution imbalance among the radiation elements 210 caused by the phase difference feeding of the radiation source 20 in the corresponding shape design of the radiation source 20, thereby facilitating the balancing of the shape of the microwave beam and improving the stability of the Doppler microwave detection device.

[0119] It is worth mentioning that reducing the intensity difference of the edge electric field of the two radiating elements 210 on both sides of the same zero potential line can reduce the detection dead zone of the microwave beam and at the same time form a change in the beam angle of the microwave beam in the corresponding direction. By adjusting the intensity difference of the edge electric field of the two radiating elements 210 on both sides of the same zero potential line, the beam angle of the microwave beam is adjusted, which is beneficial to adapting to different beam angle requirements.

[0120] Specifically, refer to the accompanying drawings of the specification of this invention. Figure 11A and Figure 11B The structural principle of the Doppler microwave detection device according to another modified embodiment of the above-described embodiments of the present invention, and the application of this structural principle in the visualization adjustment of the beam angle of the microwave beam are illustrated respectively. In this modified embodiment of the present invention, the radiation source 20 is provided with a plurality of grounding points 2002 on the zero potential line, wherein the electrical connection between the radiation source 20 and the reference ground 10 at each of the grounding points 2002 can be controlled by switching on and off, such as by controlling the connection between the corresponding grounding point 2002 and the reference ground 10 through mechanical control of the probe insertion. The on / off state of the electrical connection, or the on / off state of the electrical connection between the corresponding grounding point 2002 and the reference ground 10, is controlled by electronic on / off control of the diode. Based on the on / off control of the electrical connection between the corresponding number and position of the grounding points 2002 and the reference ground 10, the offset of the actual zero potential point formed on the radiation source 20 relative to the zero potential line is adjusted. Correspondingly, the difference in the intensity of the edge electric field of the two radiation elements 210 located on both sides of the same zero potential line is adjusted, thereby adjusting the microwave beam angle.

[0121] It is worth mentioning that, corresponding to Figure 11B By setting the on / off state of the electrical connection between the grounding points 2002 and the reference ground 10 in a corresponding number and position corresponding to the visualization interface graphic, the on / off control of the electrical connection between the grounding points 2002 and the reference ground 10 in a corresponding number and position can be realized based on the adjustment of the visualization interface graphic. In this way, when the vertical radiation surface of the microwave beam at a corresponding height is represented by the visualization interface graphic in a corresponding proportion, the vertical radiation surface of the microwave beam at a corresponding height can be visualized and adjusted based on the adjustment of the visualization interface graphic.

[0122] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A phase-difference fed Doppler microwave detection device with extended beam angle, characterized in that, include: A reference point; and A radiation source is provided, wherein the radiation source and the reference ground are spaced apart. The radiation source is divided into four radiation source regions by two mutually perpendicular straight lines passing through the physical center point of the radiation source. In the direction around the physical center point of the radiation source, any two adjacent radiation source regions are designated as a radiation element, forming four radiation elements corresponding to the radiation source. At least two radiation source regions each have an electrical feed point, through which an excitation signal of the corresponding phase is applied to the electrical feed point to feed the radiation source. The radiation source is configured in a fed state. When two radiation source regions of the same radiation element are fed and each has an electrical feed point, the two radiation source regions are fed at their corresponding electrical feed points. The excitation signal is connected to the radiation source with a phase difference of π / 8 or greater, and the angle between the sequential lines connecting the electrical feed point of one radiation source region, the physical center point of the radiation source, and the electrical feed point of the other radiation source region is greater than 10 degrees and less than 170 degrees. When there is a pair of radiation source regions belonging to different radiation elements that are fed and have their own electrical feed points, the excitation signal connected to the corresponding two electrical feed points of the pair of radiation source regions has a phase difference of π / 3 or less, and the angle between the sequential lines connecting the electrical feed point of one radiation source region, the physical center point of the radiation source, and the electrical feed point of the other radiation source region is greater than 100 degrees, thus forming a phase difference feed to the radiation source.

2. The phase-fed Doppler microwave detection device with extended beam angle according to claim 1, wherein the radiation source is set in a fed state, and when there is a pair of radiation source regions belonging to different radiation elements being fed, the excitation signals connected to the pair of radiation source regions at the corresponding two electrical feed points have a phase difference greater than 0.

3. The phase-fed Doppler microwave detection device with extended beam angle according to claim 2, wherein the radiation source is configured such that the shape of at least one pair of radiation source regions belonging to different radiation elements is not symmetrical about any straight axis passing through the physical center point of the radiation source.

4. The phase-fed Doppler microwave detection device with extended beam angle according to claim 3, wherein the two radiation source regions belonging only to the same radiation element each have the electrical feed point.

5. The phase-fed Doppler microwave detection device with extended beam angle according to claim 4, wherein the excitation signals connected to the two radiation source regions having the electrical feed points have a phase difference equal to π.

6. The phase-fed Doppler microwave detection device with extended beam angle according to claim 3, wherein the radiation source is configured as a rectangle to satisfy that the shape of at least one pair of radiation source regions belonging to different radiation elements is not symmetrical about any straight axis passing through the physical center point of the radiation source.

7. The phase-fed Doppler microwave detection device with extended beam angle according to claim 3, wherein the radiation source is configured as a square or a circle, and is further configured with a slot design that is not symmetrical about any straight axis passing through the physical center point of the radiation source, so as to satisfy that the shape of at least one pair of radiation source regions belonging to different radiation elements is not symmetrical about any straight axis passing through the physical center point of the radiation source.

8. The phase-fed Doppler microwave detection device with extended beam angle according to claim 2, wherein only a pair of radiation source regions belonging to different radiation elements have the electrical feed point.

9. The phase-fed Doppler microwave detection device with extended beam angle according to claim 8, wherein another pair of radiation source regions belonging to different said radiating elements is configured to receive feed, thereby forming a transceiver integrated design for the phase-fed Doppler microwave detection device with extended beam angle.

10. The phase-fed Doppler microwave detection device with extended beam angle according to claim 2, wherein the four radiation source regions of the radiation source each have the electrical feed point.

11. The phase-fed Doppler microwave detection device with extended beam angle according to any one of claims 2 to 10, wherein the edge of the radiation source is further arc-shaped along the line connecting the electrical feed point to the physical center point of the radiation source.

12. The phase-fed Doppler microwave detection device with extended beam angle according to claim 11, wherein the edge of the radiation source is chamfered to form an arcuate treatment of the edge of the radiation source in the direction of the line connecting the electrical feed point to the physical center point of the radiation source.

13. The phase-fed Doppler microwave detection device with extended beam angle according to any one of claims 2 to 10, wherein two straight lines dividing the radiation source into four radiation source regions are two zero-potential lines, wherein the radiation source is further disposed in the direction of the zero-potential lines having an inward concave shape toward the physical center point of the radiation source, or an outward convex shape away from the physical center point of the radiation source.

14. The phase-fed Doppler microwave detection device with extended beam angle according to any one of claims 1 to 10, wherein two straight lines dividing the radiation source into four radiation source regions are two zero-potential lines, wherein in the state where the radiation source is fed, the radiation source is electrically connected to the reference ground at the zero-potential lines.

15. The phase-fed Doppler microwave detection device with extended beam angle according to any one of claims 1 to 10, wherein the two straight lines dividing the radiation source into four radiation source regions are two zero-potential lines, and the radiation source is slotted on the zero-potential lines.

16. The phase-fed Doppler microwave detection device with extended beam angle according to any one of claims 1 to 10, wherein two straight lines dividing the radiation source into four radiation source regions are two zero-potential lines, wherein the radiation source is provided with a plurality of grounding points on the zero-potential lines, wherein the radiation source is provided at each of the grounding points with a controllable electrical connection relationship with the reference ground, so as to achieve adjustment of the beam angle of the microwave beam emitted by the phase-fed Doppler microwave detection device with extended beam angle based on the on / off control of the electrical connection between the grounding points and the reference ground of a corresponding number and position.

17. The phase-fed Doppler microwave detection device with extended beam angle according to claim 16, wherein the radiation source is provided with a pluggable probe at the grounding point to control the on / off state of the electrical connection between the corresponding grounding point and the reference ground based on the plugging of the corresponding probe.

18. The phase-fed Doppler microwave detection device with extended beam angle according to claim 16, wherein a corresponding number of diodes are disposed between the grounding point and the reference ground to control the on / off state of the electrical connection between the grounding point and the reference ground based on the on / off control of the diodes.

19. The phase-fed Doppler microwave detection device with extended beam angle according to claim 16, wherein the on / off state of the electrical connection between the grounding points and the reference ground of a corresponding number and position corresponds to a corresponding visualization interface graphic, so as to realize the on / off control of the electrical connection between the grounding points and the reference ground of a corresponding number and position based on the adjustment of the visualization interface graphic, wherein the visualization interface graphic is set to represent the vertical radiation surface of the microwave beam at a corresponding height at a corresponding scale, so as to realize the visualization adjustment of the vertical radiation surface of the microwave beam at a corresponding height based on the adjustment of the visualization interface graphic.

20. A phase-difference fed Doppler microwave detection device with extended beam angle, characterized in that, include: A reference point; and A radiation source is provided, wherein the radiation source and the reference ground are spaced apart. The radiation source is divided into four radiation source regions by two mutually perpendicular straight lines passing through the physical center point of the radiation source. Four radiation elements are formed corresponding to the radiation source, with any two adjacent radiation source regions forming a radiation element in the direction around the physical center point of the radiation source. At least two of the radiation source regions each have an electrical feed point, through which an excitation signal of the corresponding phase is applied to the electrical feed point to feed the radiation source. The radiation source is configured to be fed, and there are two radiation source regions of the same radiation element that are fed and have electrical feed points respectively. The excitation signals connected to the two radiation source regions at their corresponding electrical feed points have a phase difference of greater than or equal to π / 8. The angle between the lines connecting the electrical feed point of one radiation source region, the physical center point of the radiation source, and the electrical feed point of the other radiation source region is greater than 10 degrees and less than 170 degrees, thus forming a phase difference feed for the radiation source.

21. The phase-fed Doppler microwave detection device with extended beam angle according to claim 20, wherein the radiation source is configured such that the shapes of at least one pair of radiation source regions belonging to different radiation elements are not symmetrical about any straight axis passing through the physical center point of the radiation source.

22. A phase-difference fed Doppler microwave detection device with extended beam angle, characterized in that, include: A reference point; and A radiation source is provided, wherein the radiation source and the reference ground are spaced apart. The radiation source is divided into four radiation source regions by two mutually perpendicular straight lines passing through the physical center point of the radiation source. Four radiation elements are formed corresponding to the radiation source, with any two adjacent radiation source regions forming a radiation element in the direction around the physical center point of the radiation source. At least two of the radiation source regions each have an electrical feed point, through which an excitation signal of the corresponding phase is applied to the electrical feed point to feed the radiation source. The radiation source is configured to be fed, and there exists a pair of radiation source regions belonging to different radiation elements that are fed and each has an electrical feed point. The excitation signals connected to the corresponding two electrical feed points of the pair of radiation source regions have a phase difference of less than or equal to π / 3, and the angle between the lines connecting the electrical feed point of one radiation source region, the physical center point of the radiation source, and the electrical feed point of the other radiation source region is greater than or equal to 100 degrees, thus forming a phase difference feed of the radiation source.

23. The phase-fed Doppler microwave detection device with extended beam angle according to claim 22, wherein in a pair of radiation source regions fed and belonging to different said radiating elements, the excitation signals connected to the corresponding two said electrical feed points of the pair of radiation source regions have a phase difference greater than 0.

Images