Folding type directional microwave detection antenna

Abstract

The utility model provides a folding type directional microwave detection antenna, which comprises a reference ground and a folding dipole, the folding dipole comprises a half-wave inflection section and two folding sections, the half-wave inflection section is provided with two near-ground ends facing the reference ground, the two folding sections extend from the two near-ground ends respectively, and the two folding sections extend from the two near-ground ends respectively. Wherein the other ends of the two folded sections serve as two feed ends of the folded dipole, the distance between the two feed ends is smaller than the distance between the two near-ground ends, and the distance between the feed ends and the reference ground is larger than the distance between the near-ground ends and the reference ground. The size of the folded dipole in the width direction is reduced by bending the folded dipole for multiple times, and miniaturization of the folded directional microwave detection antenna is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of microwave detection, and in particular to a folded directional microwave detection antenna. Background Technology

[0002] Microwave detection technology operates based on the microwave Doppler effect principle. It can detect activities within a target space to determine whether a human body has entered or is present. This allows for the detection of moving objects without infringing on human privacy, making it a crucial link between people and objects, and between objects themselves, and thus has broad application prospects in behavior detection and presence detection. Existing microwave detectors are mainly classified into columnar radiation source structures and planar radiation source structures based on the structure of the radiation source. Structurally, columnar radiation source structures, with their columnar radiation source perpendicular to the reference ground, tend to occupy more installation space compared to planar structures. Therefore, in today's trend towards smaller and simpler aesthetics, planar radiation source structures are favored due to their smaller footprint and relative stability. However, planar radiation source structures have certain size requirements for their planar radiation source, meaning that the area of ​​the reference ground, while meeting structural requirements larger than the area of ​​the planar radiation source, also has certain size requirements. Therefore, in installation scenarios where the space occupied by the columnar radiation source structure microwave detector in its columnar radiation source direction is not a concern, the columnar radiation source structure microwave detector can actually occupy less installation space compared to the planar radiation source structure microwave detector. However, due to the radiation dead zone of the columnar radiation source structure microwave detector, its actual detection distance in use is much smaller than the maximum size of the corresponding radiation space in the central axis direction. That is, the actual detection distance of the existing columnar radiation source structure microwave detector is much smaller than the detection distance matched to its gain. Furthermore, the gain of the existing columnar radiation source structure microwave detector is relatively low, generally around 2dB, which further limits its application in the field of microwave Doppler detection.

[0003] To address the shortcomings of existing microwave detectors with cylindrical and planar radiation source structures, the applicant has innovatively developed a microwave detection module with a novel antenna, patent application number 202010218686.7, entitled "High-Gain Microwave Doppler Detection Module." This high-gain microwave Doppler detection module employs a dual coupling method, resulting in relatively high radiation gain and avoiding the formation of detection dead zones. Furthermore, the dual coupling method eliminates the need for a reference ground, facilitating miniaturization. However, some products have strict requirements for miniaturization. Since the first and second radiation source poles of the dual-coupled poles of the high-gain microwave Doppler detection module have certain line length requirements, and the first and second radiation source poles are provided with a first feed end and a second feed end close to each other, wherein the first radiation source pole extends from the first feed end and the second radiation source pole extends from the second feed end, in order to meet the line length requirements of the first and second radiation source poles, it is difficult to reduce the volume of the dual-coupled poles in the width direction. When corresponding to the actual product form, the corresponding housing needs to reserve enough space for the dual-coupled poles. Utility Model Content

[0004] One object of this invention is to provide a folded directional microwave detection antenna, wherein the folded directional microwave detection antenna has a compact structure by means of multiple bends, and in particular, the size in the width direction is reduced.

[0005] Another objective of this invention is to provide a folded directional microwave detection antenna, wherein the folded directional microwave detection antenna has a reduced size in the width direction while still having a high radiation gain, and can avoid the generation of detection dead zones.

[0006] Another objective of this invention is to provide a folded directional microwave detection antenna, wherein the folded directional microwave detection antenna includes a folded element and a reference ground, wherein the folded element includes a half-wave loop segment and two folded segments, wherein the half-wave loop segment is folded back towards the reference ground and has two near-ground ends, wherein the two folded segments extend from the two near-ground ends respectively, wherein the other end of the two folded segments is the two feed ends of the folded element, wherein the distance between the two feed ends is less than the distance between the two near-ground ends, and the distance between the feed ends and the reference ground is greater than the distance between the near-ground ends and the reference ground, then the distance between the two near-ground ends is the maximum dimension of the folded element in the width direction.

[0007] Another objective of this invention is to provide a folded directional microwave detection antenna, wherein the half-wave fold section has a half-wave electrical length within a tolerance range of ±25%, thereby achieving a miniaturization advantage by folding back the half-wave fold section, resulting in a folded element with a width dimension smaller than half-wave electrical length.

[0008] Another objective of this invention is to provide a folded directional microwave detection antenna, wherein the half-wave fold section is folded back towards the reference ground in a state spaced apart from the reference ground, and has a flat section and two vertical sections extending from both ends of the flat section towards the reference ground, wherein the length of the two vertical sections is greater than or equal to the length of the flat section. Under the length constraint of half a wavelength electrical length within a range of ±25% of the error of the half-wave fold section, the flat section is less than a quarter wavelength electrical length. Therefore, the size of the folded element in the width direction can be reduced to a quarter wavelength electrical length, which has a significant miniaturization advantage.

[0009] Another objective of this invention is to provide a folded directional microwave detection antenna, wherein the two folded segments extend towards each other at equal distances from the reference ground, extend in a direction perpendicular to and away from the reference ground, and extend towards each other at equal distances from the reference ground, thereby forming a structural configuration in which the distance between the two feed ends is less than the distance between the two near-ground ends, and the distance between the feed ends and the reference ground is greater than the distance between the near-ground ends and the reference ground. In this way, the structural compactness of the folded directional microwave detection antenna is improved through the multiple bending design of the folded vibrator.

[0010] Another objective of this invention is to provide a folded directional microwave detection antenna, wherein the folded directional microwave detection antenna can form directional radiation. While ensuring the structural compactness of the folded directional microwave detection antenna, the folded directional microwave detection antenna has a relatively high radiation gain in the directional radiation direction, thereby effectively improving the detection distance and sensitivity of the folded directional microwave detection antenna in practical applications.

[0011] Another objective of this invention is to provide a folded directional microwave detection antenna, wherein the folded element is fed from two feed terminals. The folded directional microwave detection antenna includes a first conductor and a second conductor, wherein the two feed terminals are electrically connected to one end of the first conductor and one end of the second conductor, respectively, and the first conductor and the second conductor feed the folded element from the two feed terminals.

[0012] Another objective of this invention is to provide a folded directional microwave detection antenna, wherein the first conductor and the second conductor are coupled to each other, wherein one end of the first conductor is grounded, and wherein when the other end of the second conductor is electrically coupled to a corresponding excitation source and a corresponding excitation signal is connected, the first conductor and the second conductor output differential signals in opposite phase at the two feed terminals to differentially feed the folded dipole.

[0013] Another objective of this invention is to provide a folded directional microwave detection antenna, wherein one end of the first conductor is grounded to facilitate the discharge of electromagnetic radiation interference from frequencies different from those of the corresponding excitation signal to the ground, thereby filtering out electromagnetic radiation interference from frequencies different from those of the folded directional microwave detection antenna and improving the anti-interference performance of the folded directional microwave detection antenna.

[0014] Another objective of this invention is to provide a folded directional microwave detection antenna, wherein, through the design of the stub load of the folded element, the resonant frequency of the folded directional microwave detection antenna can be designed to match the corresponding operating frequency, and this is beneficial for compensating for the length error of the folded element, thereby ensuring the consistency and reliability of the folded directional microwave detection antenna in mass production.

[0015] According to one aspect of the present invention, a folded directional microwave detection antenna is provided, wherein the folded directional microwave detection antenna comprises:

[0016] One reference ground; and

[0017] A folded oscillator, wherein the folded oscillator comprises a half-wave loop segment and two folded segments, wherein the half-wave loop segment has a half-wavelength electrical length within ±25% error and has two near-ground ends facing the reference ground, wherein the two folded segments extend from the two near-ground ends respectively, wherein the folded segments have a quarter-wavelength electrical length within ±25% error, wherein the other end of the two folded segments is the two feed ends of the folded oscillator, wherein the distance between the two feed ends is less than the distance between the two near-ground ends, and the distance between the feed ends and the reference ground is greater than the distance between the near-ground ends and the reference ground.

[0018] In one embodiment, the half-wave fold is folded back toward the reference ground in a state spaced apart from the reference ground, and has a flat section and two vertical sections extending from both ends of the flat section toward the reference ground, wherein the length of the two vertical sections is greater than or equal to the length of the flat section.

[0019] In one embodiment, the folded directional microwave probe antenna includes a first conductor and a second conductor, wherein the two feed terminals are electrically connected to one end of the first conductor and one end of the second conductor, respectively, and the first conductor and the second conductor feed the folded dipole at the two feed terminals.

[0020] In one embodiment, the first conductor and the second conductor are coupled to each other, wherein one end of the first conductor is grounded, and when the other end of the second conductor is electrically coupled to a corresponding excitation source and a corresponding excitation signal is connected, the first conductor and the second conductor output inverse differential signals at the two feed terminals to differentially feed the folded oscillator.

[0021] In one embodiment, the folded oscillator is differentially fed by an inverted differential signal from the excitation source, with its two feed terminals electrically coupled to the corresponding excitation source states.

[0022] In one embodiment, the two folded segments extend toward each other at a distance equal to that of the reference ground, extend in a direction perpendicular to and away from the reference ground, and extend toward each other at a distance equal to that of the reference ground.

[0023] In one embodiment, the two folded segments extend toward each other at a distance equal to that of the reference ground, extend in a direction perpendicular to and away from the reference ground, extend toward each other at a distance equal to that of the reference ground, and extend in a direction close to the reference ground.

[0024] In one embodiment, the first conductor and the second conductor extend from the two feed terminals in a direction close to the reference ground.

[0025] In one embodiment, the folded oscillator is loaded with a branch load on both of the folded segments.

[0026] In one embodiment, the folded directional microwave probe antenna includes a circuit board, wherein the reference ground is supported on the circuit board, and wherein the folded vibrator is disposed in the medium space of air and mounted on the circuit board via the first conductor and the second conductor.

[0027] In one embodiment, the folded directional microwave detection antenna includes an antenna substrate, wherein the folded element, the first conductor, and the second conductor are carried on the antenna substrate in the form of a strip wire.

[0028] In one embodiment, the number of said folded oscillators is two, wherein the two folded oscillators are arranged in an orthogonal configuration.

[0029] In one embodiment, the half-wave folding segment is folded back toward the reference ground in a state spaced apart from the reference ground, and has a flat segment and two vertical segments extending from both ends of the flat segment toward the reference ground, wherein the midpoint of the flat segment is a far-ground center point, and the two folded oscillators are orthogonally arranged so as to intersect at the two far-ground center points.

[0030] In one embodiment, the number of folded elements is set to a plurality, and the plurality of folded elements are arranged in an array to form an array antenna.

[0031] The further objectives and advantages of this invention will become fully apparent from the following description and accompanying drawings. Attached Figure Description

[0032] Figure 1 This is a schematic diagram illustrating the structural principle of a folded directional microwave detection antenna according to an embodiment of the present invention.

[0033] Figure 2 This is a schematic diagram of the folded directional microwave detection antenna according to the above embodiment of the present invention.

[0034] Figure 3A This is a schematic diagram of an optimized structure of the folded directional microwave detection antenna according to the above embodiments of the present invention.

[0035] Figure 3B The radiation pattern is shown for the optimized structure of the folded directional microwave detection antenna according to the above embodiments of the present invention.

[0036] Figure 3C The above-described optimized structure of the folded directional microwave detection antenna according to the above embodiments of this utility model is shown in the S11 curve.

[0037] Figure 4 This is a schematic diagram of a modified structure of the folded directional microwave detection antenna according to the above embodiment of the present invention.

[0038] Figure 5 This is a schematic diagram of a modified structure of the folded directional microwave detection antenna according to the above embodiment of the present invention.

[0039] Figure 6 This is a schematic diagram of a modified structure of the folded directional microwave detection antenna according to the above embodiment of the present invention.

[0040] Figure 7 This is a schematic diagram of a modified structure of the folded directional microwave detection antenna according to the above embodiment of the present invention.

[0041] Figure 8 This is a schematic diagram of a modified structure of the folded directional microwave detection antenna according to the above embodiment of the present invention.

[0042] Figure 9 This is a schematic diagram of a modified structure of the folded directional microwave detection antenna according to the above embodiment of the present invention.

[0043] Figure 10 This is a schematic diagram of a modified structure of the folded directional microwave detection antenna according to the above embodiment of the present invention.

[0044] Figure 11 This is a schematic diagram of a modified structure of the folded directional microwave detection antenna according to the above embodiment of the present invention.

[0045] Figure 12 This is a schematic diagram of a modified structure of the folded directional microwave detection antenna according to the above embodiment of the present invention. Detailed Implementation

[0046] The following description is intended to disclose the present invention so that those skilled in the art can 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 present 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 present invention.

[0047] Those skilled in the art should understand that, in the disclosure of this utility model, 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 utility model 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 limitations on this utility model.

[0048] 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.

[0049] Refer to the accompanying drawings in the specification of this utility model. Figure 1The principle structure of a foldable directional microwave detection antenna 100 according to an embodiment of the present invention is illustrated. The foldable microwave detection antenna 100 includes a foldable element 10 and a reference ground 20. The foldable element 10 is disposed in a lateral space of the reference ground 20, wherein the dimension of the foldable element 10 in the width direction is reduced by repeatedly bending the foldable element 10.

[0050] Specifically, the folded oscillator 10 includes a half-wave loop segment 11 and two folded segments 12 extending from both ends of the half-wave loop segment 11 and close to each other. The half-wave loop segment 11 has two near-ground ends 110 facing the reference ground 20. The two folded segments 12 extend close to each other from the two near-ground ends 11. The other end of the two folded segments 12 is the two feed ends 101 of the folded oscillator 10. The distance between the two feed ends 101 is less than the distance between the two near-ground ends 110, and the distance between the feed ends 101 and the reference ground 20 is greater than the distance between the near-ground ends 110 and the reference ground 20. This makes the maximum dimension of the folded oscillator 10 in the width direction the distance between the two near-ground ends 110, so as to reduce the dimension of the folded oscillator 10 in the width direction based on the folding of the folded oscillator 10.

[0051] It is worth mentioning that the folded directional microwave detection antenna 100 has a reduced size in the width direction. Therefore, in the corresponding product design, the space reserved for the folded directional microwave detection antenna 100 in the housing needs to be reduced accordingly. In particular, when the folded directional microwave detection antenna 100 is installed in the lamp, the reduction in the width direction of the folded directional microwave detection antenna 100 helps to reduce / avoid shadows caused by the folded directional microwave detection antenna 100, thereby ensuring uniform light emission from the light-emitting surface of the lamp.

[0052] Specifically, the half-wave folding segment 11 has a half-wave electrical length within a tolerance range of ±25%, and the folded segment 12 has a quarter-wave electrical length within a tolerance range of ±25%. Thus, based on the folding of the half-wave folding segment 11, the folded oscillator 10 has a miniaturization advantage because its size in the width direction is less than half the electrical length of the half-wave folding segment.

[0053] Specifically, the half-wave folding segment 11 is folded back towards the reference ground 20 in a state spaced apart from the reference ground 20, and has a flat segment 111 and two vertical segments 112 extending from both ends of the flat segment 111 toward the reference ground 20, wherein the length of the two vertical segments 112 is greater than or equal to the length of the flat segment 111. Under the length limitation of half a wavelength electrical length within the error range of ±25% of the half-wave folding segment 11, the flat segment 111 is less than or equal to one-sixth of the wavelength electrical length. Therefore, the size of the folded oscillator 10 in the width direction can be reduced to less than or equal to one-sixth of the wavelength electrical length, which has a significant miniaturization advantage.

[0054] Preferably, in this embodiment of the present invention, the length of the vertical section 112 is set to be greater than that of the flat section 111, so that the dimension of the folded oscillator 10 in the width direction is less than one-sixth of the wavelength electrical length. Through reasonable adjustment of the dimensions of the vertical section 112 and the flat section 111, the dimension of the folded oscillator 10 in the width direction is preferably adjusted to tend to one-eighth of the wavelength electrical length.

[0055] Furthermore, the two folded segments 12 extend towards each other at equal distances from the reference ground 20, extend in a direction perpendicular to and away from the reference ground 20, and extend towards each other at equal distances from the reference ground 20, thereby forming a structural configuration in which the distance between the two feed ends 101 is less than the distance between the two near-ground ends 110, and the distance between the feed end 101 and the reference ground 20 is greater than the distance between the near-ground end 110 and the reference ground 20. In this way, the structural compactness of the folded directional microwave detection antenna 100 is improved through the multiple bending design of the folded vibrator 10.

[0056] It is worth mentioning that, in this embodiment of the present invention, in order to facilitate the design of the corresponding power supply structure, the two folded segments 12 preferably extend further in a direction perpendicular to and close to the reference ground 20, that is, the two folded segments 12 extend towards each other at a position equidistant from the reference ground 20, extend in a direction perpendicular to and away from the reference ground 20, extend towards each other at a position equidistant from the reference ground 20, and extend in a direction perpendicular to and close to the reference ground 20.

[0057] Furthermore, the distance between the two feed terminals 101 is less than or equal to three-sixteenths of a wavelength electrical length, and is adapted to be fed by an excitation signal with a phase difference so that the folded oscillator 10 is fed.

[0058] Specifically, please refer to the accompanying drawings in the specification of this utility model. Figure 2The folded directional microwave detection antenna 100 includes a first conductor 41 and a second conductor 42, wherein the two feed terminals 101 are electrically connected to one end of the first conductor 41 and one end of the second conductor 42, respectively, and the first conductor 41 and the second conductor 42 feed the folded vibrator 10 through the two feed terminals 101.

[0059] Furthermore, the other end of the first conductor 41 is grounded, and the other end of the second conductor 42 is electrically coupled to a corresponding power supply, wherein the first conductor 41 and the second conductor 42 extend from the two power supply terminals 101 toward the reference ground 20.

[0060] It is worth mentioning that, in this embodiment of the present invention, the first conductor 41 and the second conductor 42 are coupled to each other and implemented as a balun. In the state where the other end of the first conductor 41 is grounded, the balun has one unbalanced port and two balanced ports. The unbalanced port is formed at the other end of the second conductor 42 and is located at the same end of the balun as the grounded end of the first conductor 41. The two balanced ports are located at the other end of the balun. The two balanced ports of the balun are electrically connected to the two feed terminals 101 respectively. When the unbalanced port is electrically coupled to the corresponding excitation source and connected to the corresponding excitation signal, the balun outputs an inverted differential signal at the two feed terminals 101 to differentially feed the folded oscillator 10.

[0061] Specifically, in the state where the unbalanced port is formed at the other end of the second conductor 42 and is located at the same end of the balun as the grounded end of the first conductor 41, the two balanced ports are respectively formed at one end of the first conductor 41 electrically connected to the feed terminal 101 and the second conductor 42 electrically connected to the feed terminal 101. When the other end of the second conductor 42 is connected to the excitation signal, the signals output by the first conductor 41 and the second conductor 42 at the two feed terminals 42 are differential signals in an anti-phase balanced state within an error range of ±30°, that is, the phase difference between the signals output by the first conductor 41 and the second conductor 42 at the two feed terminals 42 is greater than or equal to 150° and less than or equal to 210°, thus having single-ended to differential output characteristics.

[0062] Specifically, the grounding arrangement based on the first conductor 41 facilitates the discharge of electromagnetic radiation interference different from the frequency band of the excitation signal to the ground, thereby filtering out electromagnetic radiation interference different from the operating frequency band of the folded directional microwave detection antenna 100 and improving the anti-interference performance of the folded directional microwave detection antenna 100.

[0063] It is worth mentioning that, for reference Figure 8 The folded oscillator 10 is electrically coupled to the corresponding excitation source at the two feed terminals 101, and is differentially fed by receiving an inverted differential signal from the excitation source at the two feed terminals 101, thus being differentially fed by directly receiving the differential signal.

[0064] Further, the folded directional microwave detection antenna 100 includes a circuit board 30, wherein the reference ground 20 is supported on the circuit board 30, wherein the other end of the first conductor 41 and the other end of the second conductor 42 are fixed to the circuit board 30, wherein the other end of the first conductor 41 is electrically connected to the reference ground 20 and grounded while being fixed to the circuit board 30, and the other end of the second conductor 42 is fixed to the circuit board 30 at a distance from the reference ground 20 and is electrically coupled to the excitation source.

[0065] It is worth mentioning that in this structure of the present invention, the folded oscillator 10 is disposed in the medium space of air, and is mounted on the circuit board 30 based on the structure in which one end of the first conductor 41 and the second conductor 42 is electrically connected to the power supply terminal 101 and the other end is fixed to the circuit board 30, so as to be supported by the first conductor 41 and the second conductor 42.

[0066] Specifically, the first conductor 41 and the second conductor 42 are thickened relative to the folded oscillator 10. This thickening strengthens the coupling between the first conductor 41 and the second conductor 42, and also enhances their support for the folded oscillator 10. Furthermore, the thickening of the first conductor 41 and the second conductor 42 facilitates a clear structural and electrical separation between them and the folded oscillator 10, reducing the resonance effect caused by the interaction between the folded oscillator 10 and the first conductor 41 and the second conductor 42 on the overall length of the conductor.

[0067] Furthermore, through the stub load design of the folded dipole 10, the resonant frequency of the folded directional microwave detection antenna 100 can be designed to match the corresponding operating frequency, which is beneficial to compensate for the length error of the folded dipole 10 and ensure the consistency and reliability of the folded directional microwave detection antenna 100 in mass production.

[0068] Specifically, please refer to the accompanying drawings in the specification of this utility model. Figure 3A An optimized structure of the folded directional microwave detection antenna 100 is illustrated, wherein the folded element 10 is loaded with a stub load 50 on both folded segments 12. Specifically, the stub load 50 extends from the end of a segment of the folded segment 12 that extends in a direction perpendicular to the reference ground 20 towards the reference ground 20, in order to compensate for the length error of the folded element 10 and to ensure that the resonant frequency of the folded directional microwave detection antenna 100 can be matched with the corresponding operating frequency, thereby ensuring the consistency and reliability of the folded directional microwave detection antenna 100 in mass production.

[0069] refer to Figure 3B Taking the 5.8GHz ISM band as an example, the radiation pattern of the optimized structure of the folded directional microwave detection antenna 100 is shown. The folded directional microwave detection antenna 100 can form directional radiation, and the gain in the directional radiation direction is close to 5.8dB. That is to say, while ensuring the structural compactness of the folded directional microwave detection antenna 100, the folded directional microwave detection antenna 100 has a relatively high radiation gain in the directional radiation direction. Accordingly, the detection distance and sensitivity of the folded directional microwave detection antenna 100 in actual application are effectively improved.

[0070] refer to Figure 3C Taking the 5.8 GHz ISM band as an example, the S11 curve corresponding to the optimized structure of the folded directional microwave probe antenna 100 is shown. The S11 curve shows obvious narrow-frequency valleys, exhibiting obvious resonance characteristics and low loss at the resonance frequency. The corresponding resonance frequency appears near 5.8 GHz, which can match the 5.8 GHz ISM band.

[0071] Furthermore, referring to the accompanying drawings in the specification of this utility model... Figure 4A modified structure of the folded directional microwave detection antenna 100 is illustrated, wherein the staggered design of the folded dipole 10 of the folded directional microwave detection antenna 100 facilitates a further reduction in the length of the flat section 111, thereby facilitating a further reduction in the width dimension of the folded dipole 10. Specifically, the two feed terminals 101 are staggered in the width direction of the folded dipole 10, thus avoiding the requirement that the distance between the two feed terminals 101 be less than or equal to three-sixteenths of a wavelength. This results in an occupation in the width direction of the folded oscillator 10. Specifically, the two folded segments 12 extend towards each other at equal distances from the reference ground 20, extend away from the reference ground 20, extend towards each other at equal distances from the reference ground 20, and extend in a staggered manner towards the reference ground 20, thereby causing the two feed ends 101 to be staggered in the width direction of the folded oscillator 10, wherein the first conductor 41 and the second conductor 42 extend from the two feed ends 101 in a direction towards the reference ground 20.

[0072] Furthermore, referring to the accompanying drawings in the specification of this utility model... Figure 5 A modified structure of the folded directional microwave detection antenna 100 is illustrated, wherein the on-board design of the folded directional microwave detection antenna 100 improves the structural stability of the folded directional microwave detection antenna 100 and helps to reduce the size of the folded directional microwave detection antenna 100 while meeting the corresponding line length requirements. Specifically, the folded directional microwave detection antenna includes an antenna substrate 60, wherein the folded dipole 10, the first conductor 41, the second conductor 42, and the stub load 50 are supported on the antenna substrate 60 in the form of a strip wire, thereby supporting the folded dipole 10 based on the support of the antenna substrate 60. Furthermore, since the antenna substrate 60 has a higher dielectric constant than air, the physical length corresponding to meeting the wavelength electrical length requirements of the folded dipole 10, the first conductor 41, and the second conductor 42 can be reduced, thereby further facilitating the miniaturization of the folded directional microwave detection antenna 100.

[0073] It is worth mentioning that, among them, the corresponding Figure 5The schematic onboard design shows that the folded vibrator 10, the first conductor 41, the second conductor 42, and the stub load 50 are carried on one side of the antenna substrate 60 in the form of a strip conductor. The other ends of the first conductor 41 and the second conductor 42 are located at one edge of the antenna substrate 60. The antenna substrate 60 is fixed to the circuit substrate 30 with the edge facing the circuit substrate 30, thereby facilitating grounding the other end of the first conductor 41 and electrically coupling the other end of the second conductor 42 to the feed source.

[0074] Further reference Figure 6 The folded oscillator 10, the first conductor 41, the second conductor 42, and the stub load 50 are carried on two opposite surfaces of the antenna substrate 60 in the form of strip wires and are electrically connected through metallized vias. Based on the support of the antenna substrate 60 on the first conductor 41 and the second conductor 42, a solid medium is introduced into the coupling space between the first conductor 41 and the second conductor 42 to enhance the coupling strength between the first conductor 41 and the second conductor 42, which is beneficial to reducing the transmission loss of the first conductor 41 and the second conductor 42.

[0075] Further reference is made to the accompanying drawings in the specification of this utility model. Figure 7 In this modified structure, the folded dipole 10 is disposed on two opposite surfaces of the antenna substrate 60 in the form of a strip conductor. Specifically, the midpoint of the flat section 111 is designated as a far-ground center point 1110. The distance between any feed terminal 101 of the folded dipole 10 and the far-ground center point 1110 is half the electrical wavelength. The folded dipole 10 is divided into two segments by the far-ground center point 1110, with the feed terminal electrically connected to the first conductor 41 being one segment. The section containing 101 is the first half-band, and the end where the feed terminal 101, which is electrically connected to the second conductor 42, is the second half-band. The first half-band of the folded dipole 10 is carried on one side of the antenna substrate 60, and the second half-band is carried on the other side of the antenna substrate 60. The first half-band and the second half-band are electrically connected at the far-ground center point 1110 by a metallized via, thus forming a structure in which the folded dipole 10 is disposed on two opposite sides of the antenna substrate 60.

[0076] Corresponding to the configuration where the folded vibrator 10 is disposed on two opposite sides of the antenna substrate 60, the first conductor 41, corresponding to the corresponding feed terminal 101, is supported on one side of the antenna substrate 60, and the second conductor 42, corresponding to the corresponding feed terminal 101, is supported on the other side of the antenna substrate 60. This creates a structure where the first conductor 41 and the second conductor 42 are disposed on two opposite sides of the antenna substrate 60. Simultaneously, because the antenna substrate 60 is located between the first conductor 41 and the second conductor 42, a solid medium is introduced into the coupling space between the first conductor 41 and the second conductor 42, enhancing the coupling energy between them. Similarly, the two stub loads 50 also correspond to the folded segments 12 being supported on both sides of the antenna substrate 60.

[0077] It is worth mentioning that further reference Figures 9 to 11 In these modified embodiments of the present invention, the number of the folded oscillators 10 is set to multiple, specifically, corresponding to Figure 9 The number of folded elements 10 is set to two, and the two elements 10 are arranged in an array to form an array antenna.

[0078] Corresponding to Figure 10 The number of folded elements 10 is set to two, and the two folded elements 10 are arranged in an orthogonal configuration. The folded directional microwave probe antenna 100 can be designed with a transmit / receive separation, so as to ensure the signal isolation of the folded directional microwave probe antenna 100 by means of the transmit / receive separation design and the orthogonally arranged folded elements 10.

[0079] Corresponding to Figure 11 In the structure in which the two folded elements 10 are arranged in an orthogonal configuration, the two folded elements 10 are arranged in an orthogonal configuration intersecting at the two far-ground center points 1110, thereby improving the structural compactness of the folded directional microwave detection antenna 100 under the orthogonal configuration, which is beneficial to the miniaturization of the folded directional microwave detection antenna 100.

[0080] It is worth mentioning that, in some embodiments of this utility model, corresponding to Figure 11The two folded dipoles 10 shown are orthogonally arranged in a state where they intersect at the two far-ground center points 1110. The two folded dipoles 10 can be grounded at the far-ground center point 1110 through a conductor. Based on the grounding setting of the midpoint of the half-wave loop segment 11 with 1 / 2 wavelength electrical length within the ±25% error range, the zero potential point of the folded dipole 10 is electrically connected to the reference ground 20. This helps to reduce the loss of the folded directional microwave detection antenna 100 and improve the transmission and reception efficiency and radiation gain. It also improves the anti-interference performance of the folded directional microwave detection antenna 100, reduces the dimensional accuracy requirements of the folded directional microwave detection antenna 100 in the mass production process, enhances the production tolerance of the folded directional microwave detection antenna 100, and ensures product performance consistency.

[0081] Further reference is made to the accompanying drawings of this utility model. Figure 12 , which corresponds to Figure 11 The two folded oscillators 10 shown are orthogonally arranged in a state where they intersect at the two far-center points 1110. The resulting structure in which the two folded oscillators 10 are arranged in a spatially staggered state can be designed to offset the positions of the two folded oscillators 10 at the two far-center points 1110 based on the settlement or lifting design of the half-wave folding section 11 at the middle position.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0083] 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 purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A folded directional microwave detection antenna, characterized in that, include: One reference ground; and A folded oscillator, wherein the folded oscillator comprises a half-wave loop segment and two folded segments, wherein the half-wave loop segment has a half-wavelength electrical length within ±25% error and has two near-ground ends facing the reference ground, wherein the two folded segments extend from the two near-ground ends respectively, wherein the folded segments have a quarter-wavelength electrical length within ±25% error, wherein the other end of the two folded segments is the two feed ends of the folded oscillator, wherein the distance between the two feed ends is less than the distance between the two near-ground ends, and the distance between the feed ends and the reference ground is greater than the distance between the near-ground ends and the reference ground.

2. The folded directional microwave detection antenna according to claim 1, wherein the half-wave fold section is folded back toward the reference ground in a state spaced apart from the reference ground, and has a flat section and two vertical sections extending from both ends of the flat section toward the reference ground, wherein the length of the two vertical sections is greater than or equal to the length of the flat section.

3. The folded directional microwave detection antenna according to claim 2, wherein the folded directional microwave detection antenna includes a first conductor and a second conductor, wherein the two feed terminals are electrically connected to one end of the first conductor and one end of the second conductor, respectively, and the first conductor and the second conductor feed the folded vibrator at the two feed terminals.

4. The folded directional microwave detection antenna according to claim 3, wherein the first conductor and the second conductor are coupled to each other, wherein one end of the first conductor is grounded, wherein when the other end of the second conductor is electrically coupled to a corresponding excitation source and a corresponding excitation signal is connected, the first conductor and the second conductor output inverse differential signals at the two feed terminals to differentially feed the folded dipole.

5. The folded directional microwave detection antenna according to claim 2, wherein the folded element is electrically coupled to the corresponding excitation source state at both feed terminals and is differentially fed from the excitation source by an inverted differential signal.

6. The folded directional microwave detection antenna according to claim 3, wherein the two folded segments extend toward each other at a distance equal to that of the reference ground, extend in a direction perpendicular to and away from the reference ground, and extend toward each other at a distance equal to that of the reference ground.

7. The folded directional microwave detection antenna according to claim 3, wherein the two folded segments extend toward each other at a distance equal to that of the reference ground, extend in a direction perpendicular to and away from the reference ground, extend toward each other at a distance equal to that of the reference ground, and extend in a direction close to the reference ground.

8. The folded directional microwave detection antenna according to claim 3, wherein the first conductor and the second conductor extend from the two feed ends in a direction close to the reference ground.

9. The folded directional microwave detection antenna according to claim 3, wherein the folded element is loaded with a stub load in both folded segments.

10. The folded directional microwave detection antenna according to any one of claims 3, 4, 6 to 9, wherein the folded directional microwave detection antenna includes a circuit board, wherein the reference ground is supported on the circuit board, and wherein the folded vibrator is disposed in the medium space of air and mounted on the circuit board via the first conductor and the second conductor.

11. The folded directional microwave detection antenna according to any one of claims 3, 4, 6 to 9, wherein the folded directional microwave detection antenna includes an antenna substrate, wherein the folded vibrator, the first conductor, and the second conductor are carried on the antenna substrate in the form of a strip wire.

12. The folded directional microwave detection antenna according to any one of claims 2 to 9, wherein the number of folded elements is two, and the two folded elements are arranged in an orthogonal configuration.

13. The folded directional microwave detection antenna according to claim 12, wherein the midpoint of the flat section is a far-ground center point, and the two folded elements are orthogonally arranged so as to intersect at the two far-ground center points.

14. The folded directional microwave detection antenna according to any one of claims 1 to 9, wherein the number of folded elements is set to a plurality, and the plurality of folded elements are arranged in an array to form an array antenna.

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