Antenna system and millimeter wave radar

Abstract

The embodiments of the present application relate to the field of antenna design technology, and in particular to an antenna system and its millimeter wave radar. The antenna system includes: a substrate, which is configured as a reference ground; a plurality of rectangular microstrip lines arranged on the surface of the substrate, and different rectangular microstrip lines are respectively configured as driving units or parasitic units to form at least one antenna. The distance between two adjacent rectangular microstrip lines meets a preset first distance standard; the distance between the rectangular microstrip line configured as a driving unit and the edge of the substrate meets a preset second distance standard. Such a design can obtain an antenna with sufficient beam width without using a complex structure, effectively reducing the impact of process tolerance on antenna performance, and can ensure that the two antennas have sufficiently high isolation, which can well meet the requirements for miniaturization of the antenna system.

Description

Technical field

[0001] The present application relates to the field of antenna design technology, and in particular to an antenna system and millimeter-wave radar thereof. [Background Technology]

[0002] Millimeter-wave radar, a detection radar operating in the millimeter-wave frequency band, is widely used in many different fields because it combines the advantages of microwaves and light waves. Existing millimeter-wave radars, when used in short-range applications, require antenna systems to be as simple as possible while still maintaining a wide beamform in both the E-plane and the H-plane. This poses significant challenges to antenna structural design.

[0003] Furthermore, many existing applications of millimeter-wave radars require miniaturization, which significantly limits the size of antennas and necessitates high isolation between closely spaced antennas.

[0004] Therefore, there is an urgent need to provide a suitable antenna system to meet people's needs. [Summary of the invention]

[0005] The embodiments of the present application aim to provide an antenna system and millimeter-wave radar thereof, which can solve one or more defects existing in the design of traditional antenna systems.

[0006] In a first aspect, embodiments of the present application provide the following technical solutions: an antenna system. The antenna system includes: a substrate configured as a reference ground; and a plurality of rectangular microstrip lines arranged on the surface of the substrate, with different rectangular microstrip lines configured as drive units or parasitic units, respectively, to form at least one antenna. The distance between two adjacent rectangular microstrip lines meets a preset first distance standard, and the distance between a rectangular microstrip line configured as a drive unit and an edge of the substrate meets a preset second distance standard.

[0007] Optionally, an antenna includes: a rectangular microstrip line configured as a driving unit; and at least one rectangular microstrip line configured as a parasitic unit; wherein, at least one rectangular microstrip line configured as a parasitic unit is arranged in sequence and is provided on one side of the rectangular microstrip line configured as the driving unit.

[0008] Optionally, the different rectangular microstrip lines form two or more antennas; the driving unit of one antenna is arranged in a zero field region formed by the other antenna on the reference ground.

[0009] Optionally, the zero field region is formed by the joint action of two or more rectangular microstrip lines constituting the antenna, and is determined by the current distribution of the rectangular microstrip lines on the reference ground.

[0010] Optionally, the substrate is a rectangle with a preset side length, so that the distance between the rectangular microstrip line configured as the driving unit and the edge of the substrate meets a preset second distance standard.

[0011] Optionally, the at least two antennas include a transmitting antenna and a receiving antenna;

[0012] The transmitting antenna is composed of a first rectangular microstrip line configured as a driving unit and a second rectangular microstrip line configured as a parasitic unit;

[0013] The receiving antenna is composed of a third rectangular microstrip line configured as a driving unit and a fourth rectangular microstrip line configured as a parasitic unit;

[0014] The first rectangular microstrip line and the third rectangular microstrip line are symmetrically arranged along a diagonal line of the rectangular substrate; the second rectangular microstrip line and the fourth rectangular microstrip line are symmetrically arranged along another diagonal line of the rectangular substrate.

[0015] Optionally, the at least two antennas include a transmitting antenna and a receiving antenna;

[0016] The transmitting antenna is composed of a fifth rectangular microstrip line configured as a driving unit and two sixth and seventh rectangular microstrip lines configured as parasitic units;

[0017] The receiving antenna is composed of an eighth rectangular microstrip line configured as a driving unit and two ninth and tenth rectangular microstrip lines configured as parasitic units;

[0018] The fifth rectangular microstrip line and the eighth rectangular microstrip line are symmetrically arranged along a diagonal line of the rectangular substrate;

[0019] The sixth rectangular microstrip line and the seventh rectangular microstrip line are sequentially arranged on a side of the fifth rectangular microstrip line away from the edge of the rectangular substrate;

[0020] The ninth rectangular microstrip line and the tenth rectangular microstrip line are sequentially arranged on a side of the sixth rectangular microstrip line away from an edge of the rectangular substrate.

[0021] Optionally, the first distance standard is: the distance between the centers of gravity of two adjacent rectangular microstrip lines is within a numerical range formed by floating up and down a preset value based on half the antenna wavelength.

[0022] Optionally, the second distance standard is that the distance between the edge of the rectangular microstrip line configured as the driving unit and the edge of the substrate is within a numerical range formed by floating up and down preset values ​​based on integer multiples of the antenna wavelength.

[0023] In a second aspect, the embodiments of the present application further provide the following technical solution: a millimeter wave radar, wherein the millimeter wave radar includes the antenna system described above.

[0024] One advantage of the antenna system provided by the embodiments of this application is that it provides a design concept for widening the antenna system's beamwidth in the E-plane direction by adjusting the distance between the microstrip antenna and the substrate edge, and widening the antenna system's beamwidth in the H-plane direction by configuring a parasitic element with the driver element. This allows for an antenna with sufficient beamwidth to be achieved without the use of complex structures such as slots and vias, effectively reducing the impact of process tolerances on antenna performance.

[0025] Another advantage of the antenna system provided by the embodiments of this application is that it provides a design concept for placing the driving units of different antennas within the zero-field region formed by the other antenna on the reference ground. This ensures that the two antennas have sufficient isolation even when they are closely spaced, effectively meeting the demand for miniaturized antenna systems.

Brief Description of the Drawings

[0026] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0027] Figure 1 A schematic diagram of the structure of the antenna system provided in an embodiment of the present application;

[0028] Figure 2a A schematic diagram of an antenna model provided in an embodiment of the present application;

[0029] Figure 2b The E-plane directional diagram provided in the embodiment of the present application shows Figure 2a The beamwidth of the antenna model shown for different substrate sizes;

[0030] Figure 3a A schematic diagram of an antenna system provided in an embodiment of the present application shows a case where the antenna is composed of a driving unit and a parasitic unit;

[0031] Figure 3b A schematic diagram of an antenna system provided in accordance with another embodiment of the present application shows a case where the antenna is composed of a driving unit and two parasitic units;

[0032] Figure 4The H-plane radiation pattern of the antenna system provided in the embodiment of the present application shows the H-plane radiation pattern of only one driving unit, one driving unit and one parasitic unit, and one driving unit and two parasitic units;

[0033] Figure 5a A schematic diagram of a simulation of current distribution provided in an embodiment of the present application, showing the current distribution of an antenna having only one driving unit at a reference ground;

[0034] Figure 5b A schematic diagram of a simulation of current distribution provided in an embodiment of the present application shows the current distribution of an antenna having one driving unit and one parasitic unit on a reference ground;

[0035] Figure 5c A schematic diagram of a simulation of current distribution provided in an embodiment of the present application shows the current distribution of an antenna having one driving unit and two parasitic units on a reference ground;

[0036] Figure 6a A schematic diagram of the structure of the antenna system provided in Example 1 of the present application;

[0037] Figure 6b A schematic diagram of the structure of the antenna system provided in Example 2 of the present application;

[0038] Figure 7a The directional diagram of the antenna system provided in the embodiment of the present application shows Figure 6a The beamwidth of the antenna system shown in the E-plane and H-plane;

[0039] Figure 7b The directional diagram of the antenna system provided in the embodiment of the present application shows Figure 6b The beamwidth of the antenna system shown in the E-plane and H-plane;

[0040] Figure 8a The S parameter diagram provided in the embodiment of the present application shows Figure 6a The S11 and S21 parameters of the antenna system shown;

[0041] Figure 8b The S parameter diagram provided in the embodiment of the present application shows Figure 6b The S11 and S21 parameters of the antenna system are shown. [Specific implementation method]

[0042] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as being "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "upper", "lower", "inner", "outer", "bottom" and the like used in this specification indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0044] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0045] According to some embodiments of the present application, for example Figure 3a As shown in FIG3 b , the antenna system may include: a substrate 20 and a rectangular microstrip antenna 10 arranged on the surface of the substrate 20 .

[0046] A "rectangular microstrip antenna" is a microstrip line consisting solely of a rectangle, without complex structures such as slots or vias. Its specific dimensions can be determined based on actual needs.

[0047] A portion of the rectangular microstrip line can be connected to a feeder, thereby being configured as the antenna's driver unit. The driver unit is the antenna used to transmit and receive signals. Alternatively, a portion of the rectangular microstrip line can be left unconnected to the feeder and laid out only on one side of the driver unit, thereby acting as a parasitic element corresponding to the driver unit.

[0048] On the substrate 20, the distance between two adjacent rectangular microstrip lines needs to be appropriately adjusted to meet a preset first distance standard. In some embodiments, the first distance standard may be that the distance between the centers of gravity of the two adjacent rectangular microstrip lines is approximately half the antenna wavelength.

[0049] In other words, the distance between the two needs to fall within a range of values ​​defined by a preset floating value, based on half the antenna wavelength. The specific floating value can be set based on actual needs and is an empirical value.

[0050] In addition, the distance between the rectangular microstrip line configured as the driving unit and the edge of the substrate also needs to be appropriately adjusted to meet a preset second distance standard. In some embodiments, optionally, the second distance standard can be that the distance between the edge of the rectangular microstrip line configured as the driving unit and the edge of the substrate is approximately an integer multiple of the antenna wavelength.

[0051] In other words, the distance between the edge of the rectangular microstrip line and the edge of the substrate needs to fall within a numerical range formed by floating up and down preset values ​​based on integer multiples of the antenna wavelength. Of course, the specific floating value can be set according to actual needs.

[0052] One of the advantages of the antenna system provided by the embodiment of the present application is that by adjusting the distance between the edge of the rectangular microstrip line and the edge of the substrate to an appropriate distance and adding parasitic units, the beam width of the antenna system can be widened without using complex structures such as slots or vias, thereby effectively reducing the impact of process errors on antenna performance.

[0053] According to some embodiments of the present application, when the antenna system includes two or more antennas (such as a transmitting antenna and a receiving antenna), for example Figure 6a Or as shown in Figure 6b, the driving unit of one of the antennas can be set in the zero field area formed by the other antenna on the reference ground.

[0054] Among them, the "zero field area" is an area on the reference ground where the driving units and parasitic units that make up the antenna have different current distributions on the reference ground, which are offset and coupled, and basically have no electromagnetic influence on them.

[0055] Another advantage of the antenna system provided by the embodiment of the present application is that by setting the driving unit of the antenna in the zero field area formed by another antenna, mutual interference between the two antennas can be effectively avoided, thereby achieving a higher isolation degree, which is conducive to miniaturization of the antenna size.

[0056] It should be noted that based on the design ideas and implementation principles disclosed in this application, adjustments, replacements or combinations of the structure of the antenna system described in the specific embodiments of this application according to actual needs are all within the scope of this application.

[0057] The following, in conjunction with the drawings of the present application specification, takes an antenna system with an operating frequency of 24 GHz and a wavelength of 12 mm as an example to describe in detail the antenna structure design ideas and specific implementation principles of the present application. Based on the same design ideas, those skilled in the art can also adjust, replace or combine one or more embodiments in the present application specification according to different actual application scenarios to obtain more different antenna systems without being limited to the antenna system described in the present application specification, such as changing the operating frequency of the antenna system.

[0058] According to some embodiments of this application, please refer to Figure 1 , Figure 1 The schematic diagram of the antenna system provided in the embodiment of the present application shows how the beam width of the antenna's E-plane can be increased by adjusting the distance between the edge of the microstrip antenna and the edge of the substrate. The antenna system includes a microstrip line 10 and a substrate 20 for supporting the microstrip line 10.

[0059] Among them, the two radiating edges of the microstrip line 10 can be equivalent to two magnetic current sources (at Figure 1 When the two magnetic flux sources radiate to the edges of the substrate 20 on both sides as the reference ground (in Figure 1 When the edges L1 and L2 are marked as L1 and L2 respectively in the figure, the edges L1 and L2 will produce diffraction fields.

[0060] The total antenna radiation pattern can be obtained by superimposing the radiation generated by the microstrip line 10 itself and the diffraction field vector. In the process of realizing this application, the applicant surprisingly found that the distance between the two radiating edges of the microstrip antenna and the edges of the substrate can be adjusted (in Figure 1 The amplitude and phase of the diffraction field are changed by changing the diffraction field, so that after superposition with the radiation of the microstrip line, the beam width of the antenna E surface is widened.

[0061] According to some embodiments of the present application, Figure 2a A schematic diagram of the antenna model provided in an embodiment of the present application. Figure 2b The E-plane directional diagram provided in the embodiment of the present application shows Figure 2a The E-plane beam situation of the antenna model substrate at different sizes is shown.

[0062] Among them, see Figure 2a ,exist Figure 2a In the antenna model shown, a square microstrip antenna 10 is arranged at the center of a substrate 20. The substrate 20 is also configured to be square with a side length of Lg.

[0063] By gradually changing the side length of the substrate 20 , the relationship between the distances between the two radiating sides of the microstrip antenna and the edges on both sides of the substrate and the E-plane radiation pattern is traversed.

[0064] See also Figure 2b , shows the E-plane directional diagram when the side length of the substrate 20 is 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29 and 31 mm. Figure 2b From the E-plane radiation patterns of substrates 20 of different sizes shown in the figure, it can be seen that when the side lengths of the substrates are 15 and 27 mm and the distances d1 and d2 are approximately integer multiples of the wavelength, the E-plane beam width of the antenna model can be greatly widened. However, when other substrate sizes are selected, the beam width does not increase significantly or fluctuates greatly (for example, the radiation patterns when the side lengths of the substrates are 31 mm and 29 mm).

[0065] According to some embodiments of this application, please refer to Figure 3a , Figure 3a The schematic diagram of the antenna system provided in the embodiment of the present application shows how the beam width of the antenna in the H-plane can be increased by adding parasitic elements. The antenna system may include: two or more rectangular microstrip lines and a substrate 20 for supporting the rectangular microstrip lines.

[0066] Among them, at least one rectangular microstrip line is used as the driving unit of the antenna (in Figure 3a Another rectangular microstrip line is arranged on one side of the driving unit 10a as a parasitic unit added in the horizontal direction of the antenna H surface (in Figure 3a In some embodiments, the driving unit 10a and the parasitic unit 10b may optionally be rectangular microstrip lines of the same size.

[0067] According to some embodiments of this application, please refer to Figure 3b , Figure 3b A schematic diagram of an antenna system provided in another embodiment of the present application. Figure 3a The antenna system shown is distinguished by Figure 3b The antenna system shown includes two parasitic elements 10b.

[0068] The two parasitic units 10b are sequentially arranged on one side of the driving unit 10a (eg Figure 3b In some embodiments, optionally, the spacing between two adjacent rectangular microstrip lines as the driving unit 10a or the parasitic unit 10b (in Figure 3a and Figure 3b The wavelength (marked as dy) can be controlled to about half the antenna wavelength.

[0069] In the process of realizing the present application, the applicant surprisingly discovered that the radiation of the parasitic unit can compensate for the radiation pattern of a single driving unit, thereby achieving the effect of expanding the H-plane beamwidth.

[0070] It should be noted that, for the sake of convenience, the embodiments of the present application only illustrate the case where there are one or two parasitic units. Those skilled in the art will appreciate that, based on the inventive concepts disclosed in the embodiments of the present application, more parasitic units may be provided as needed, and are not limited to those shown in the drawings.

[0071] According to some embodiments of this application, please refer to Figure 4 , Figure 4 The H-plane radiation pattern of the antenna system provided in the embodiment of the present application shows the H-plane radiation pattern of only one driving unit, one driving unit and one parasitic unit, and one driving unit and two parasitic units.

[0072] Among them, the H-plane pattern corresponding to only one driving unit is Figure 4 The H-plane pattern corresponding to one driving unit and one parasitic unit is marked as curve 1. Figure 4 Marked as curve 2 (for example Figure 3a As shown), the H-plane pattern corresponding to one driving unit and two parasitic units is Figure 4 Marked as curve 3 (for example Figure 3b shown).

[0073] Depend on Figure 4 From the comparison results of curve 1 to curve 3, it can be seen that the additional parasitic unit can effectively increase the H-plane beamwidth of the antenna.

[0074] According to some embodiments of the present application, Figures 5a-5c The simulation diagrams of the current distribution of different antenna models in the reference ground provided in the embodiments of the present application respectively show the simulation results of antenna models with only one driving unit, one driving unit and one parasitic unit, and one driving unit and two parasitic units.

[0075] Among them, see Figure 5b and 5c It is surprising to find that under the joint action of the driving unit and the parasitic unit (coupling cancellation), a certain area of ​​zero field area is generated on the reference ground (at Figure 5b and 5c Therefore, when the antenna system includes two or more antennas (for example, a transmitting antenna and a receiving antenna), the driving unit of one antenna (for example, the transmitting antenna) can be arranged in the zero-field region formed by the other antenna (for example, the receiving antenna), thereby ensuring sufficiently high isolation between the two antennas and avoiding mutual interference.

[0076] This application further provides multiple specific examples of antenna systems consisting of a transmitting antenna and a receiving antenna to fully illustrate the inventive concept and technical effects of the antenna systems disclosed in the above embodiments. Figure 6a This is a schematic diagram of the antenna system provided in Example 1 of the present application. Figure 6b Schematic diagram of the antenna system provided in Example 2 of the present application.

[0077] See also Figure 6a The antenna system includes: a transmitting antenna 11, a receiving antenna 12 and a substrate 20.

[0078] The substrate 20 is rectangular, with a long side of 12 mm ( Figure 6a The short side is 10.5mm (marked as Lg in Figure 6a The transmitting antenna 11 and the receiving antenna 12 are each composed of a driving unit and a parasitic unit.

[0079] The driving units and parasitic units of the transmitting antenna and the receiving antenna are all rectangular microstrip lines of the same size. The transmitting antenna 11 and the receiving antenna 12 can be in a rotationally symmetrical structure.

[0080] For the sake of simplicity and distinction, in the embodiment of the present application, they are respectively described as the first rectangular microstrip line, the second rectangular microstrip line, the third rectangular microstrip line and the fourth rectangular microstrip line (in Figure 6a are marked as 11a, 11b, 12a and 12b respectively).

[0081] The first and second rectangular microstrip lines 11a and 11b are aligned horizontally and arranged on the substrate 20. Similarly, the third and fourth rectangular microstrip lines 12a and 12b are also aligned horizontally and arranged on the substrate 20. Furthermore, the third rectangular microstrip line 12a, configured as a driving element, is located diagonally above the first rectangular microstrip line 11a, and both are located on a diagonal line of the substrate 20. Similarly, the second and fourth rectangular microstrip lines 11b and 12b, configured as parasitic elements, are located on another diagonal line of the substrate 20.

[0082] The vertical distance between the centers of gravity of the third rectangular microstrip line 12a and the second rectangular microstrip line 11b (in Figure 6a The horizontal distance between the centers of gravity of adjacent rectangular microstrip lines is 5 mm (in Figure 6a is marked as dy).

[0083] See also Figure 7a and Figure 8a , Figure 7a Shown Figure 6aThe H-plane radiation pattern and E-plane radiation pattern of the antenna system shown; Figure 8a Shown Figure 6a Schematic diagram of S11 parameters and S21 parameters of the antenna system shown.

[0084] Among them, Figure 7a The test results shown can be seen, Figure 6a The antenna system shown has a wide beam width in both the H-plane and E-plane directions. Figure 8a The test results shown can be seen, Figure 6a The antenna system shown has a high degree of isolation between the transmit and receive antennas.

[0085] See also Figure 6b The antenna system includes: a transmitting antenna 11, a receiving antenna 12 and a substrate 20.

[0086] The substrate 20 is rectangular, with a long side of 17 mm ( Figure 6b The short side is 16mm (marked as Lg in Figure 6b The transmitting antenna 11 and the receiving antenna 12 are each composed of a driving unit and two parasitic units.

[0087] The driving units and parasitic units of the transmitting antenna and the receiving antenna are all rectangular microstrip lines of the same size. The transmitting antenna 11 and the receiving antenna 12 can be in a rotationally symmetrical structure.

[0088] For the sake of simplicity and distinction, the fifth rectangular microstrip line, the sixth rectangular microstrip line, the seventh rectangular microstrip line, the eighth rectangular microstrip line, the ninth rectangular microstrip line and the tenth rectangular microstrip line are respectively described in the embodiment of the present application ( Figure 6b are marked as 11a, 11b, 11c, 12a, 12b and 12c respectively).

[0089] The fifth rectangular microstrip line 11a, the sixth rectangular microstrip line 11b, and the seventh rectangular microstrip line 11c are aligned in the horizontal direction and arranged on the substrate 20. Similarly, the eighth rectangular microstrip line 12a, the ninth rectangular microstrip line 12b, and the tenth rectangular microstrip line 11c are aligned in the horizontal direction and arranged on the substrate 20. In addition, the eighth rectangular microstrip line 12a, which is configured as a driving unit, is located diagonally above the fifth rectangular microstrip line 11a, and the two are located on the diagonal line of the substrate 20. The sixth rectangular microstrip line 11b and the seventh rectangular microstrip line 11c, which are configured as parasitic units, are arranged in sequence on one side of the fifth microstrip line 11a. Similarly, the ninth rectangular microstrip line 12b and the tenth rectangular microstrip line 12c, which are configured as parasitic units, are arranged in sequence on one side of the eighth microstrip line 12a.

[0090] The vertical distance between the centers of gravity of the eighth rectangular microstrip line 12a and the third rectangular microstrip line 11c is (in Figure 6b The horizontal distance between the centers of gravity of adjacent rectangular microstrip lines (denoted as dx) is 10.4 mm. Figure 6b Marked as dy) is 5.6mm.

[0091] See also Figure 7b and Figure 8b , Figure 7b Shown Figure 6b The H-plane radiation pattern and E-plane radiation pattern of the antenna system shown; Figure 8b Shown Figure 6b Schematic diagram of S11 parameters and S21 parameters of the antenna system shown.

[0092] Among them, Figure 7b The test results shown can be seen, Figure 6b The antenna system shown has a wide beam width in both the H-plane and E-plane directions. Figure 8b The test results shown can be seen, Figure 6b The antenna system shown has a high degree of isolation between the transmit and receive antennas.

[0093] Based on the antenna system provided in the above embodiments, the present application also provides a millimeter-wave radar. The millimeter-wave radar, using the antenna system, can achieve a wide beam width based on a simple structural design and achieve high antenna isolation while meeting the requirements of miniaturization.

[0094] In summary, the antenna system provided in the embodiment of the present application, on the one hand, widens the beam width of the antenna system in the H-plane and E-plane directions by adjusting the spacing between the microstrip antenna and the edge of the substrate and adding parasitic units; on the other hand, it ensures high isolation between antennas by placing the antenna's driving unit in the zero-field area formed by another antenna.

[0095] Such an antenna system can well meet the needs of existing millimeter-wave radar in actual application scenarios, effectively reduce process errors and meet the needs of miniaturization, and has good application prospects.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Based on the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present application as described above. For the sake of simplicity, they are not provided in detail. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An antenna system, characterized in that: include: a substrate configured as a reference ground; A plurality of rectangular microstrip lines arranged on the surface of the substrate, wherein different rectangular microstrip lines are respectively configured as driving units or parasitic units to form at least one antenna; Wherein, the distance between two adjacent rectangular microstrip lines meets a preset first distance standard; The distance between the rectangular microstrip line configured as the driving unit and the edge of the substrate meets a preset second distance standard; One of the antennas comprises: a rectangular microstrip line configured as a driving element; and at least one rectangular microstrip line configured as a parasitic element; Wherein, at least one of the rectangular microstrip lines configured as the parasitic unit is arranged in sequence and is provided on one side of the rectangular microstrip line configured as the driving unit; Different rectangular microstrip lines form two or more antennas; The driving unit of one of the antennas is arranged in a zero field area formed by the other antenna on the reference ground.

2. The antenna system according to claim 1, wherein The zero field region is formed by the joint action of two or more rectangular microstrip lines constituting the antenna and is determined by the current distribution of the rectangular microstrip lines on the reference ground.

3. The antenna system according to claim 1, wherein: The substrate is a rectangle with a preset side length, so that the distance between the rectangular microstrip line configured as the driving unit and the edge of the substrate meets a preset second distance standard.

4. The antenna system according to claim 3, wherein: The at least two antennas include a transmitting antenna and a receiving antenna; The transmitting antenna is composed of a first rectangular microstrip line configured as a driving unit and a second rectangular microstrip line configured as a parasitic unit; The receiving antenna is composed of a third rectangular microstrip line configured as a driving unit and a fourth rectangular microstrip line configured as a parasitic unit; The first rectangular microstrip line and the third rectangular microstrip line are symmetrically arranged along a diagonal line of the rectangular substrate; the second rectangular microstrip line and the fourth rectangular microstrip line are symmetrically arranged along another diagonal line of the rectangular substrate.

5. The antenna system according to claim 4, characterized in that The at least two antennas include a transmitting antenna and a receiving antenna; The transmitting antenna is composed of a fifth rectangular microstrip line configured as a driving unit and two sixth and seventh rectangular microstrip lines configured as parasitic units; The receiving antenna is composed of an eighth rectangular microstrip line configured as a driving unit and two ninth and tenth rectangular microstrip lines configured as parasitic units; The fifth rectangular microstrip line and the eighth rectangular microstrip line are symmetrically arranged along a diagonal line of the rectangular substrate; The sixth rectangular microstrip line and the seventh rectangular microstrip line are sequentially arranged on a side of the fifth rectangular microstrip line away from the edge of the rectangular substrate; The ninth rectangular microstrip line and the tenth rectangular microstrip line are sequentially arranged on a side of the sixth rectangular microstrip line away from an edge of the rectangular substrate.

6. The antenna system according to any one of claims 1 to 5, characterized in that: The first distance standard is that the distance between the centers of gravity of two adjacent rectangular microstrip lines is within a numerical range formed by floating up and down a preset value based on half the antenna wavelength.

7. The antenna system according to any one of claims 1 to 5, characterized in that: The second distance standard is that the distance between the edge of the rectangular microstrip line configured as the driving unit and the edge of the substrate is within a numerical range formed by floating up and down preset values ​​based on integer multiples of the antenna wavelength.

8. A millimeter wave radar, characterized in that: The millimeter wave radar includes the antenna system according to any one of claims 1 to 7.

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