Substrate integrated trapped wave mirror image dielectric waveguide S-shaped circularly polarized antenna

Abstract

The invention provides a substrate integrated trapped wave mirror image dielectric waveguide S-shaped circularly polarized antenna, which belongs to the field of antennas and comprises an S-shaped dielectric radiator, a metalized through hole, a microstrip feeder line, a first metal grounding plate, a first dielectric substrate, a second metal grounding plate and a second dielectric substrate, the S-shaped dielectric radiator is embedded in the first dielectric substrate and located in the center of the antenna, the lower surface of the S-shaped dielectric radiator is tightly attached to the second metal grounding plate, the upper surface of the S-shaped dielectric radiator is not covered, a plurality of metalized through holes penetrate through the first dielectric substrate and are arranged on the periphery of the S-shaped dielectric radiator in an array mode, and a gap is formed in the second metal grounding plate. The microstrip feeder is located on the lower surface of the second dielectric substrate and is perpendicular to the gap. The end, away from the gap, of the microstrip feeder is connected to a feed port in the second dielectric substrate. Circular polarization is easy to realize by combining the bent dielectric structure with the slot coupling feed at the bottom, and the radiation efficiency of the antenna is improved by using the notch mirror image structure in the antenna design.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna applicable to a millimeter wave frequency band. Background Art

[0002] With the rapid development of wireless communication technology, society's demand for high-speed and even ultra-high-speed wireless communications continues to rise. The millimeter wave band has become the first choice for researchers and scientific researchers due to its wide absolute bandwidth and short wavelength characteristics. In this frequency band, circularly polarized antennas have significant advantages over traditional linearly polarized antennas in reducing channel polarization mismatch and suppressing multipath effects, and are widely used in satellite communications, radar detection, and global positioning systems.

[0003] As a high-performance transmission structure, the notch mirror line fully meets the needs of modern wireless communication systems for low profile, miniaturization and integration due to its miniaturization and easy integration. This structure is not only easy to generate radiation and suitable as an antenna feeder, but also can realize the miniaturization of the antenna and facilitate integration with the communication system, thereby improving the system integration and reducing the size. Choosing the notch mirror line as the circularly polarized radiation unit in the millimeter wave band will make it easier to realize the miniaturization and high-integration design of the equipment, further promoting the development of wireless communication technology.

[0004] In the prior art, a Chinese invention patent application with publication number CN117594977A, “Circularly Polarized S-Type Dielectric Resonator Antenna and Wireless Communication System” provides a circularly polarized S-type dielectric resonator antenna, including a microstrip feeder, a dielectric substrate, a ground plane and an S-shaped dielectric block, wherein the dielectric substrate is located between the microstrip feeder and the ground plane, a gap is arranged on the ground plane, the microstrip feeder is perpendicular to the gap, and a feeding port is arranged at one end of the microstrip feeder away from the gap, and the S-shaped dielectric block is located above the gap. By constructing the S-shaped dielectric block, a magnetic current is formed on the S-shaped dielectric block, and circular polarization is radiated while transmitting. However, the antenna has a weak anti-interference ability and cannot effectively suppress interference from adjacent frequency bands. The communication quality and reliability of the antenna are greatly limited. Summary of the invention

[0005] The technical problem to be solved by the present invention is how to design a substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna with better radiation performance.

[0006] The present invention solves the above technical problems through the following technical solutions: a substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna, comprising an S-shaped dielectric radiator, a metallized through hole, a microstrip feeder, and a first metal ground plate, a first dielectric substrate, a second metal ground plate, and a second dielectric substrate that are stacked and arranged. The S-shaped dielectric radiator is embedded in the first dielectric substrate and is located at the center of the antenna. The lower surface of the S-shaped dielectric radiator is in close contact with the second metal ground plate, and the upper surface is uncovered. A plurality of metallized through holes penetrate the first dielectric substrate and are arranged in an array on the periphery of the S-shaped dielectric radiator. A gap is set on the second metal ground plate. The microstrip feeder is located on the lower surface of the second dielectric substrate and is perpendicular to the gap. The end of the microstrip feeder away from the gap is connected to a feeding port on the second dielectric substrate.

[0007] In the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna of the present invention, the array-arranged metallized through holes and the second metal ground plate form a groove structure, the S-shaped dielectric radiator is located in the groove structure, the first metal ground plate covers the edge of the metallized through hole, and the upper surface of the S-shaped dielectric radiator is uncovered, forming a notch mirror structure, the S-shaped dielectric radiator is in the shape of the letter S as a whole, and circular polarization can be easily achieved through the curved dielectric structure combined with the slot coupling feeding at the bottom. The present invention uses the notch mirror structure in the antenna design, the electromagnetic signal is fed into the antenna through the feeding port, transmitted through the microstrip feeder, coupled to the S-shaped dielectric radiator through the slot, and then radiates electromagnetic energy outward through the S-shaped dielectric radiator. The notch mirror structure can produce strong reflection or absorption within a specific frequency range, thereby achieving signal attenuation or reflection at these frequencies, and can attenuate non-target signals, that is, noise interference, effectively suppress interference from adjacent frequency bands, improve the radiation efficiency of the antenna, and improve the communication quality and reliability of the system.

[0008] Preferably, the top of the metallized through hole is connected to the first metal ground plate, and the bottom is connected to the second metal ground plate, and the first metal ground plate covers the edge of the metallized through hole.

[0009] Preferably, the edge of the metallized through hole is in close contact with the periphery of the S-shaped dielectric radiator.

[0010] Preferably, there is a gap between the edge of the metallized through hole and the periphery of the S-shaped dielectric radiator.

[0011] Preferably, the gap is an air slot or an air hole.

[0012] Preferably, the S-shaped dielectric radiator comprises a first arc-shaped portion and a second arc-shaped portion, and the first arc-shaped portion and the second arc-shaped portion are centrally symmetrical structures to form an S shape.

[0013] Preferably, the inner diameter of the first arc-shaped portion is 2.5 mm, the outer diameter is 4.5 mm, the angle spanned by the first arc-shaped portion and the second arc-shaped portion is 150°, and the height of the S-shaped dielectric radiator is 3 mm.

[0014] Preferably, the S-type dielectric radiator is made of a high dielectric constant material.

[0015] Preferably, the material of the S-type dielectric radiator is the same as that of the first dielectric substrate, and the S-type dielectric radiator is directly cut inside the first dielectric substrate. The first dielectric substrate is made of Rogers 3010 material, with a dielectric constant of 10.2 and a loss tangent of 0.0035.

[0016] Preferably, the slot is a rectangular slot located in the middle of the second metal ground plate, the microstrip feed line is perpendicular to the length direction of the slot, and one end of the microstrip feed line close to the slot exceeds the slot by a set distance.

[0017] The advantages provided by the present invention are:

[0018] (1) In the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna of the present invention, the array-arranged metallized through holes and the second metal ground plate form a groove structure, the S-shaped dielectric radiator is located in the groove structure, the first metal ground plate covers the edge of the metallized through hole, and the upper surface of the S-shaped dielectric radiator is uncovered, forming a notch mirror structure, the S-shaped dielectric radiator is in the shape of the letter S as a whole, and circular polarization is achieved in the millimeter wave frequency band through the curved dielectric structure combined with the slot coupling feeding at the bottom, and circular polarization is easily formed. The present invention uses the notch mirror structure in the antenna design, the electromagnetic signal is fed into the antenna through the feeding port, transmitted through the microstrip feeder, coupled to the S-shaped dielectric radiator through the slot, and then radiates electromagnetic energy outward through the S-shaped dielectric radiator. The notch mirror structure can produce strong reflection or absorption within a specific frequency range, thereby achieving signal attenuation or reflection at these frequencies, and can attenuate non-target signals, that is, noise interference, effectively suppress interference from adjacent frequency bands, improve the radiation efficiency of the antenna, and improve the communication quality and reliability of the system.

[0019] (2) The metallized through hole can not only connect the first metal ground plate and the second metal ground plate to make the two have equal potential, but also serve as the metal wall outside the S-type dielectric mirror line to prevent electromagnetic waves from being transmitted to both sides through the S-type dielectric radiator, so that the antenna can achieve better side-radiation effect and improve the radiation performance of the antenna.

[0020] (3) By setting a gap between the metallized through hole and the S-shaped dielectric radiator, a low-loss transmission path can be provided for the propagation of electromagnetic waves. Since the dielectric constant of air is low, it has almost no attenuation effect on the propagation of electromagnetic waves. Therefore, the gap can help reduce the loss of electromagnetic waves caused by the absorption of the medium during the transmission process and improve the overall efficiency of the antenna system. The introduction of the gap will change the distribution of the electromagnetic field, adjust the frequency response of the antenna, and achieve the desired frequency characteristics.

[0021] (4) When the gap between the edge of the metallized through hole and the periphery of the S-shaped dielectric radiator is set as an air through hole, it is easier to integrate and process the PCB board, thereby reducing the production cost.

[0022] (5) When the material of the S-type dielectric radiator is the same as that of the first dielectric substrate, the S-type dielectric radiator is directly cut inside the first dielectric substrate, which is easier to integrate and miniaturize, and can be suitable for the small size requirements of the millimeter wave frequency band.

[0023] (6) The present invention designs the end of the microstrip feeder close to the gap to extend beyond the set distance of the gap. When the microstrip feeder is slightly longer than the center position of the antenna unit, it can help to better match the impedance between the feeder and the antenna unit. Good impedance matching can reduce reflection loss and increase the radiation efficiency of the antenna, thereby improving the performance of the entire antenna system. The design with a slightly longer length can adjust the phase and amplitude of the electromagnetic wave, allowing energy transmission between the feeder and the antenna unit to be smoother. Properly extending the length of the microstrip feeder can expand the working bandwidth of the antenna. Since the bandwidth of the antenna depends to a certain extent on the range of impedance matching, a feeder that is slightly longer than the center position can provide a certain amount of adjustment space to help improve the matching between different frequency bands. This is especially beneficial for antenna systems that require wideband operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional diagram of a substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 1 of the present invention;

[0025] Figure 2 A top view of a substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Embodiment 1 of the present invention;

[0026] Figure 3 A side view of a substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 1 of the present invention;

[0027] Figure 4 A three-dimensional diagram of a substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention;

[0028] Figure 5A top view of a substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention;

[0029] Figure 6 A side view of a substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention; Figure 7-Figure 9 All of them are electromagnetic simulation parameter curves of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 1 of the present invention;

[0030] Fig.10 The radiation pattern of the XOZ plane at a frequency of 29.8 GHz of the electromagnetic simulation parameter curve of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 1 of the present invention;

[0031] Fig.11 The electromagnetic simulation parameter curve of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 1 of the present invention is a YOZ radiation pattern at a frequency of 29.8 GHz;

[0032] Figure 12-14 All of them are electromagnetic simulation parameter curves of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention;

[0033] Fig.15 The radiation pattern of the XOZ plane at a frequency of 30.8 GHz of the electromagnetic simulation parameter curve of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention;

[0034] Fig.16 The electromagnetic simulation parameter curve diagram of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention is a radiation pattern of the YOZ plane at a frequency of 30.8 GHz;

[0035] Fig.17 The radiation pattern of the XOZ plane at a frequency of 31.2 GHz of the electromagnetic simulation parameter curve of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention;

[0036] Fig.18 The electromagnetic simulation parameter curve of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention is a radiation pattern of the YOZ plane at a frequency of 31.2 GHz;

[0037] In the figure: 10 S-type dielectric radiator, 11 first arc-shaped portion, 12 second arc-shaped portion, 20 metallized through hole, 30 microstrip feed line, 40 first metal ground plate, 50 first dielectric substrate, 60 second metal ground plate, 61 gap, 70 second dielectric substrate, 71 feeding port, 80 air through hole. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The present invention provides a substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna, comprising an S-shaped dielectric radiator 10, a metallized through hole 20, a microstrip feed line 30, and a first metal ground plate 40, a first dielectric substrate 50, a second metal ground plate 60, and a second dielectric substrate 70 that are stacked and arranged. The S-shaped dielectric radiator 10 is embedded in the first dielectric substrate 50 and is located at the center of the antenna. The lower surface of the S-shaped dielectric radiator 10 is in close contact with the second metal ground plate 60, and the upper surface is uncovered. A plurality of metallized through holes 20 penetrate the first dielectric substrate 50 and are arranged in an array on the periphery of the S-shaped dielectric radiator 10. A slot 61 is provided on the second metal ground plate 60. The microstrip feed line 30 is located on the lower surface of the second dielectric substrate 70 and is perpendicular to the slot 61. One end of the microstrip feed line 30 away from the slot 61 is connected to a feeding port 71 on the second dielectric substrate 70.

[0040] In the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna of the present invention, the metallized through hole 20 penetrates the first dielectric substrate 50, the top of the metallized through hole 20 is connected to the first metal ground plate 40, and the bottom is connected to the second metal ground plate 60, the array-arranged metallized through hole 20 and the second metal ground plate 60 form a groove structure, the S-shaped dielectric radiator 10 is located in the groove structure, the first metal ground plate 40 covers the edge of the metallized through hole 20, and the upper surface of the S-shaped dielectric radiator 10 is uncovered, forming a notch mirror structure, the S-shaped dielectric radiator 10 is in the shape of the letter S as a whole, and circular polarization is easily achieved by coupling and feeding through the curved dielectric structure combined with the gap 61 at the bottom. The present invention uses the notch mirror structure in the antenna design, the electromagnetic signal is fed into the antenna through the feeding port 71, transmitted through the microstrip feed line 30, coupled to the S-shaped dielectric radiator 10 through the gap 61, and then radiates electromagnetic energy outward through the S-shaped dielectric radiator 10. The notch mirror structure can produce strong reflection or absorption within a specific frequency range, thereby achieving signal attenuation or reflection at these frequencies. It can attenuate non-target signals, that is, noise interference, effectively suppress interference from adjacent frequency bands, improve the radiation efficiency of the antenna, and improve the communication quality and reliability of the system.

[0041] The metallized through hole 20 can not only connect the first metal ground plate 40 and the second metal ground plate 60 to make the two have equal potential, but also serve as the metal wall outside the S-type dielectric mirror line to prevent electromagnetic waves from being transmitted to both sides through the S-type dielectric radiator 10, so that the antenna can achieve better side emission effect and improve the radiation performance of the antenna.

[0042] The substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna of the present invention can be specifically configured into two structures, which are respectively introduced in detail below.

[0043] Example 1

[0044] like Figure 1-3 As shown, the present embodiment provides a substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna, comprising an S-shaped dielectric radiator 10, a metallized through hole 20, a microstrip feed line 30, and a first metal ground plate 40, a first dielectric substrate 50, a second metal ground plate 60, and a second dielectric substrate 70 that are stacked and arranged. The S-shaped dielectric radiator 10 is embedded in the first dielectric substrate 50 and is located at the center of the antenna. The lower surface of the S-shaped dielectric radiator 10 is in close contact with the second metal ground plate 60, and the upper surface is uncovered. A plurality of metallized through holes 20 penetrate the first dielectric substrate 50 and are arranged in an array on the periphery of the S-shaped dielectric radiator 10. The edge of the metallized through hole 20 is in close contact with the periphery of the S-shaped dielectric radiator 10. A slot 61 is provided on the second metal ground plate 60. The microstrip feed line 30 is located on the lower surface of the second dielectric substrate 70 and is perpendicular to the slot 61. The end of the microstrip feed line 30 away from the slot 61 is connected to a feeding port 71 on the second dielectric substrate 70.

[0045] The first metal grounding plate 40, the first dielectric substrate 50, the second metal grounding plate 60, and the second dielectric substrate 70 are stacked in sequence from top to bottom, the top of the metallized through hole 20 is connected to the first metal grounding plate 40, and the bottom is connected to the second metal grounding plate 60, and the first metal grounding plate 40 covers the edge of the metallized through hole 20. The height of the metallized through hole 20 is consistent with the thickness of the first dielectric substrate 50, the spacing between two adjacent metallized through holes 20 is the same, and the spacing between two adjacent metallized through holes 20 and the radius of the metallized through hole 20 can be adjusted according to specific needs. For example, in this embodiment, the radius of the metallized through hole 20 can be set to 0.25 mm.

[0046] The S-shaped dielectric radiator 10 is centrally symmetrical about the center of the antenna. The S-shaped dielectric radiator 10 includes a first arc portion 11 and a second arc portion 12. The first arc portion 11 and the second arc portion 12 are centrally symmetrical structures to form an S shape. In order to better introduce the structure of the S-shaped dielectric radiator 10, a spatial rectangular coordinate system O-XYZ is established, including an origin O, an X-axis, a Y-axis, and a Z-axis. The origin of the coordinate system is located at the center of the second metal ground plate 60 in the figure. In order to avoid the overlap of the coordinate system and the components to interfere with the reading of the figure, the coordinate system is drawn outside the eight-arm Archimedean spiral circularly polarized dielectric resonator antenna. The S-shaped dielectric radiator and the dielectric substrate are both parallel to the XOY plane of the spatial rectangular coordinate system O-XYZ. The S-shaped dielectric radiator 10 is placed vertically on the second metal ground plate 60. Its S-shaped structure is centrally symmetrical about the origin of the coordinate. Its structure can be split along the Y-axis into two parts that are centrally symmetrical about the origin of the coordinate. The YOZ surface back structure is designed with emphasis. The three-dimensional structure of the S-type dielectric radiator can be designed from a plane. For the rear plane structure of the YOZ surface, its structure can be regarded as two arcs of different radii connected into a plane. The two arcs have the center of the circle as the radius. The inner diameter of the first arc portion 11 is designed to be 2.5mm, and the outer diameter is designed to be 4.5mm, that is, the width of the ring formed by the two arcs is 2mm, and the angle spanned by the arc is 150°, that is, the angle spanned by the first arc portion 11 and the second arc portion 12 is 150°. The plane structure of the positive part of the YOZ surface is generated by rotating the rear plane structure 180° about the Z axis. The structures of the positive part and the rear part are combined to form an S-type plane structure. Giving the S-type plane structure a height forms an S-type dielectric radiator, and the height can be designed to be 3mm.

[0047] The S-type dielectric radiator 10 is made of high dielectric constant material, and can be made of the same material as the first dielectric substrate 50, which is more convenient for integration. When the material of the S-type dielectric radiator 10 is the same as that of the first dielectric substrate 50, the S-type dielectric radiator 10 can be directly cut inside the first dielectric substrate 50. The first dielectric substrate 50 is made of Rogers 3010 material, with a dielectric constant of 10.2 and a loss tangent value of 0.0035.

[0048] The second dielectric substrate 70 is made of Rogers 3010 material, with a dielectric constant of 10.2 and a loss tangent of 0.0035. The first dielectric substrate 50 and the second dielectric substrate 70 have the same length and width, but different heights. For example, the first dielectric substrate 50 and the second dielectric substrate 70 have a length of 20 mm and a width of 20 mm, a height of the first dielectric substrate 50 of 3 mm, and a height of the second dielectric substrate 70 of 0.254 mm.

[0049] The first metal ground plate 40 and the second metal ground plate 60 are both rectangular ground plates. The first metal ground plate 40 is used as the upper metal ground of the notch dielectric image line, and the second metal ground plate 60 is used as the lower metal ground of the notch dielectric image line and the metal reflector of the microstrip feeder. The length and width of the first metal ground plate 40 and the second metal ground plate 60 are the same, and the length and width can be designed to be 20 mm.

[0050] The gap 61 is a rectangular gap located in the middle of the second metal grounding plate 60 . The length of the rectangular gap is 3 mm and the width is 0.6 mm.

[0051] The microstrip feeder 30 is perpendicular to the length direction of the slot 61, and the end of the microstrip feeder 30 close to the slot 61 exceeds the set distance of the slot. The length of the microstrip feeder 30 is 11 mm and the width is 1.2 mm. The present invention designs the end of the microstrip feeder 30 close to the slot 61 to exceed the set distance of the slot. When the microstrip feeder is slightly longer than the center position of the antenna unit, it can help to better match the impedance between the feeder and the antenna unit. Good impedance matching can reduce reflection loss and increase the radiation efficiency of the antenna, thereby improving the performance of the entire antenna system. The design with a slightly longer length can adjust the phase and amplitude of the electromagnetic wave, so that energy transmission between the feeder and the antenna unit is smoother. Appropriately extending the length of the microstrip feeder can expand the working bandwidth of the antenna. Since the bandwidth of the antenna depends on the range of impedance matching to a certain extent, the feeder slightly longer than the center position can provide a certain adjustment space to help improve the matching between different frequency bands, which is particularly beneficial for antenna systems that require wideband operation.

[0052] The feeding port 71 is located on the side of the second dielectric substrate 70. The feeding port 71 is used as the input end of the entire antenna. The length of the feeding port 71 is the same as the width of the microstrip feed line 30. The width of the feeding port 71 is the same as the height of the second dielectric substrate 70. In this embodiment, the length of the feeding port 71 is 1.2 mm and the width is 0.254 mm.

[0053] Example 2

[0054] like Figure 4-6As shown, the difference between this embodiment and embodiment 1 is that there is a gap between the edge of the metallized through hole 20 and the periphery of the S-type dielectric radiator 10, and the other structures are the same. By setting a gap between the metallized through hole 20 and the S-type dielectric radiator 10, a low-loss transmission path can be provided for the propagation of electromagnetic waves. Since the dielectric constant of air is low, it has almost no attenuation effect on the propagation of electromagnetic waves. Therefore, the gap can help reduce the loss of electromagnetic waves caused by the absorption of the medium during the transmission process, and improve the overall efficiency of the antenna system. The introduction of the gap will change the distribution of the electromagnetic field, adjust the frequency response of the antenna, and achieve the desired frequency characteristics. The gap can be set as an air slot or an air through hole 80. The difference is that it is set as an air hole, which is easier to integrate than an air slot, and is easy to process the PCB board, thereby reducing the production cost. When the gap is set as an air through hole, a plurality of air through holes are arranged in an array, Figure 3 The air holes are shown to be arranged in two rows at intervals.

[0055] Simulation Analysis

[0056] Figure 7-Figure 9 All of them are electromagnetic simulation parameter curves of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 1 of the present invention. It can be seen that the reflection coefficient in the frequency band of 29.61GHz-29.88GHz is less than -10dB, the axial ratio in the frequency band of 29.73GHz-29.84GHz is less than 3dB, and the gain is maintained at about 3dB in the working frequency band.

[0057] Fig.10 The radiation pattern of the XOZ plane at a frequency of 29.8 GHz of the electromagnetic simulation parameter curve of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 1 of the present invention; Fig.11 The electromagnetic simulation parameter curve of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 1 of the present invention is a YOZ radiation pattern at a frequency of 29.8 GHz; the black solid line is the main polarization, and the black dotted line is the cross polarization.

[0058] Figure 12-14 All of them are electromagnetic simulation parameter curves of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention; it can be seen that the reflection coefficient in the frequency band of 30.84GHz-31.32GHz is less than -10dB, the axial ratio in the frequency band of 30.53GHz-31.32GHz is less than 3dB, and the gain in the working frequency band is maintained at about 6dB.

[0059] Fig.15 The radiation pattern of the XOZ plane at a frequency of 30.8 GHz of the electromagnetic simulation parameter curve of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention; Fig.16The electromagnetic simulation parameter curve diagram of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention is a radiation pattern of the YOZ plane at a frequency of 30.8 GHz; Fig.17 The radiation pattern of the XOZ plane at a frequency of 31.2 GHz of the electromagnetic simulation parameter curve of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention; Fig.18 The electromagnetic simulation parameter curve of the substrate-integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna provided in Example 2 of the present invention is the radiation pattern of the YOZ plane at a frequency of 31.2 GHz; the black solid line is the main polarization, and the black dotted line is the cross-polarization. It can be observed that the side lobes and cross-polarization of the radiation pattern within the working bandwidth are relatively low.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Substrate integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna, characterized by: The invention comprises an S-shaped dielectric radiator (10), a metallized through hole (20), a microstrip feed line (30), and a first metal ground plate (40), a first dielectric substrate (50), a second metal ground plate (60), and a second dielectric substrate (70) arranged in a stacked manner. The S-shaped dielectric radiator (10) is embedded in the first dielectric substrate (50) and is located at the center of the antenna. The lower surface of the S-shaped dielectric radiator (10) is in close contact with the second metal ground plate (60), and the upper surface is uncovered. A plurality of metallized through holes (20) penetrate the first dielectric substrate (50) and are arranged in an array around the periphery of the S-shaped dielectric radiator (10). A slit (61) is provided on the second metal ground plate (60). The microstrip feed line (30) is located on the lower surface of the second dielectric substrate (70) and is perpendicular to the slit (61). The end of the microstrip feed line (30) away from the slit (61) is connected to a feeding port (71) on the second dielectric substrate (70).

2. The substrate integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna according to claim 1, characterized in that: The top of the metallized through hole (20) is connected to the first metal grounding plate (40), and the bottom is connected to the second metal grounding plate (60), and the first metal grounding plate (40) covers the edge of the metallized through hole (20).

3. The substrate integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna according to claim 1, characterized in that: The edge of the metallized through hole (20) is in close contact with the periphery of the S-shaped dielectric radiator (10).

4. The substrate integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna according to claim 1, characterized in that: There is a gap between the edge of the metallized through hole (20) and the periphery of the S-shaped dielectric radiator (10).

5. The substrate integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna according to claim 4, characterized in that: The gap is an air slot or an air through hole (80).

6. The substrate integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna according to claim 1, characterized in that: The S-shaped dielectric radiator (10) comprises a first arc-shaped portion (11) and a second arc-shaped portion (12); the first arc-shaped portion (11) and the second arc-shaped portion (12) are centrally symmetrical structures to form an S shape.

7. The substrate integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna according to claim 6, characterized in that: The inner diameter of the first arc-shaped portion (11) is 2.5 mm, the outer diameter is 4.5 mm, the angle spanned by the first arc-shaped portion (11) and the second arc-shaped portion (12) is 150°, and the height of the S-shaped dielectric radiator (10) is 3 mm.

8. The substrate integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna according to claim 1, characterized in that: The S-type dielectric radiator (10) is made of a high dielectric constant material.

9. The substrate integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna according to claim 1 or 8, characterized in that: The material of the S-shaped dielectric radiator (10) is the same as that of the first dielectric substrate (50); the S-shaped dielectric radiator (10) is obtained by directly cutting inside the first dielectric substrate (50); the first dielectric substrate (50) is made of Rogers 3010 material, with a dielectric constant of 10.2 and a loss tangent value of 0.0035.

10. The substrate integrated notch mirror dielectric waveguide S-shaped circularly polarized antenna according to claim 1, characterized in that: The slot (61) is a rectangular slot located in the middle of the second metal grounding plate (60); the microstrip feed line (30) is perpendicular to the length direction of the slot (61); and one end of the microstrip feed line (30) close to the slot (61) exceeds the slot by a set distance.

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