Millimeter wave circularly polarized antenna based on orthogonal electric dipoles

Abstract

This invention provides a millimeter-wave circularly polarized antenna based on orthogonal electric dipoles, relating to the field of communication antenna technology. The antenna includes a vertically aligned antenna radiating structure and a microstrip coupling slot feeding structure. In the antenna radiating structure, a first strip patch and a second strip patch are located on the upper and lower surfaces of a first dielectric substrate and are orthogonal to each other, fulfilling a necessary condition for generating a circularly polarized wave. A slot is formed in the middle of both the first and second strip patches, fulfilling another necessary condition for generating a circularly polarized wave. In the microstrip coupling slot feeding structure, a metal ground layer is sandwiched between a second and third dielectric substrate that overlap vertically. A butterfly-shaped slot is formed at the center of the metal ground layer, and the metal ground layer is connected to a microstrip feed line on the bottom surface of the third dielectric substrate. By feeding the antenna radiating structure through the microstrip feed line, the metal ground layer, and the butterfly-shaped slot, a wide-bandwidth circularly polarized wave with strong polarization performance can be generated.

Description

Technical Field

[0001] This invention relates to the field of communication antenna technology, and in particular to a millimeter-wave circularly polarized antenna based on orthogonal electric dipoles. Background Technology

[0002] Circularly polarized antennas possess significant advantages such as resistance to multipath interference, suppression of rain and fog interference, and improved channel capacity, and are widely used in various modern wireless communications, including satellite communications, radio frequency identification (RFID), wireless local area networks (WLANs), and global positioning systems (GPS). Millimeter-wave technology, with its advantages of high frequency and short wavelength, plays an increasingly important role in communication systems. Therefore, the research and design of millimeter-wave circularly polarized antennas are crucial.

[0003] Common implementations of circularly polarized antennas can be categorized as follows: cross-shaped symmetrical dipoles, microstrip antennas, and helical antennas. Cross-shaped symmetrical dipoles utilize two orthogonal symmetrical dipoles fed with signals of equal amplitude and a 90° phase difference to achieve circular polarization. They offer advantages such as simple structure, ease of fabrication, and wide beamwidth. However, to achieve unidirectional radiation, a reflector is required at a certain height above the ground, resulting in a high antenna profile. Helical antennas are advantageous for beamforming, achieving a relatively wide circularly polarized beamwidth. However, due to their spiral-shaped structure, they also suffer from a high profile, making them unsuitable for integrated and conformal applications. Traditional microstrip antennas are formed by attaching conductive patches to a dielectric substrate with a conductive ground plane. They use coaxial or microstrip line feeding and introduce geometric perturbations to achieve circular polarization. They offer advantages such as low profile, light weight, and ease of conformal application, but suffer from a narrow bandwidth and poor polarization performance. Therefore, there is an urgent need for a millimeter-wave circularly polarized antenna with a low profile, wide bandwidth, and strong polarization performance. Summary of the Invention

[0004] The purpose of this invention is to provide a millimeter-wave circularly polarized antenna based on orthogonal electric dipoles, which has the advantages of low profile, wide bandwidth and strong polarization performance compared with traditional antenna structures.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] On one hand, the present invention provides a millimeter-wave circularly polarized antenna based on orthogonal electric dipoles. The millimeter-wave circularly polarized antenna includes: an antenna radiating structure and a microstrip coupled slot feeding structure; the antenna radiating structure and the microstrip coupled slot feeding structure are centered in the vertical direction.

[0007] The antenna radiation structure includes: a first dielectric substrate, and a first strip patch and a second strip patch located above and below the first dielectric substrate and orthogonal to each other; a slit is provided in the middle of the first strip patch to divide the first strip patch into two parts with opposite electric vector directions; a slit is provided in the middle of the second strip patch to divide the second strip patch into two parts with opposite electric vector directions.

[0008] The microstrip coupling slot feeding structure includes: a second dielectric substrate, a third dielectric substrate, a metal ground layer located between the second dielectric substrate and the third dielectric substrate, and a microstrip feed line located on the bottom surface of the third dielectric substrate; a butterfly-shaped slot is formed at the center of the metal ground layer; the microstrip coupling slot feeding structure feeds the antenna radiating structure through the microstrip feed line, the metal ground layer and the butterfly-shaped slot.

[0009] Optionally, the length and width of the first dielectric substrate, the second dielectric substrate, the metal ground layer, and the third dielectric substrate are equal.

[0010] Optionally, the thickness of the first dielectric substrate is greater than the thickness of the second dielectric substrate, and the thickness of the second dielectric substrate is the same as that of the third dielectric substrate, so that there is a height difference between the first strip patch and the second strip patch.

[0011] Optionally, the two ends of the first strip patch are semi-circular structures; the two ends of the second strip patch are semi-circular structures.

[0012] Optionally, the metal ground layer can be used to construct an antenna spatial rectangular coordinate system OXYZ with the center of the butterfly slot as the origin O, the extension direction of the butterfly slot as the X-axis, the direction on the metal ground layer perpendicular to the X-axis and passing through the origin O as the Y-axis, and the direction perpendicular to the XOY plane and passing through the origin O as the Z-axis; the first strip patch has an angle of 55° with the X-axis, and the second strip patch has an angle of 35° with the X-axis.

[0013] Optionally, the microstrip feed line includes a first rectangular feed line, a second rectangular feed line, a third rectangular feed line, a fourth rectangular feed line, a fifth rectangular feed line, and a sixth rectangular feed line.

[0014] The length directions of the first, third, and fourth rectangular feed lines are perpendicular to the extension direction of the butterfly slot; the length directions of the second, fifth, and sixth rectangular feed lines are parallel to the extension direction of the butterfly slot.

[0015] One end of the first rectangular feed line is connected to the side of the third dielectric substrate, and the other end of the first rectangular feed line is connected to the center of the second rectangular feed line.

[0016] The two ends of the second rectangular feeder are connected to one end of the third rectangular feeder and one end of the fourth rectangular feeder, respectively.

[0017] The third rectangular feed line is connected at one end away from the second rectangular feed line to one end of the fifth rectangular feed line; the third rectangular feed line is located below the butterfly-shaped gap.

[0018] The other end of the fourth rectangular feed line, away from the second rectangular feed line, is connected to one end of the sixth rectangular feed line; the fourth rectangular feed line is located below the butterfly-shaped gap.

[0019] Optionally, the first rectangular feed line is connected to one end of the side of the third dielectric substrate and is also connected to one end of the seventh rectangular feed line; the other end of the seventh rectangular feed line is connected to the metal ground layer.

[0020] Optionally, the first rectangular feed line, the second rectangular feed line, the third rectangular feed line, the fourth rectangular feed line, the fifth rectangular feed line, the sixth rectangular feed line, and the seventh rectangular feed line are integrated into one structure.

[0021] Optionally, the first dielectric substrate, the second dielectric substrate, and the third dielectric substrate are all made of Rogers 5880 dielectric substrate; the dielectric constant of Rogers 5880 dielectric substrate is 2.2, and the loss tangent tanδ of Rogers 5880 dielectric substrate is 0.0009; the metal ground layer is made of copper, and the thickness of the metal ground layer is 0.035 mm.

[0022] On the other hand, the present invention also provides a millimeter-wave circularly polarized antenna array, comprising a plurality of millimeter-wave circularly polarized antennas based on orthogonal electric dipoles as described above, arranged in an array configuration.

[0023] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0024] This invention provides a millimeter-wave circularly polarized antenna based on orthogonal electric dipoles. The antenna includes: an antenna radiating structure and a microstrip coupling slot feeding structure aligned vertically; a first strip patch and a second strip patch in the antenna radiating structure are located on the upper and lower surfaces of a first dielectric substrate and are orthogonal to each other, achieving a necessary condition for generating a circularly polarized wave; slots are formed in the middle of both the first and second strip patches, dividing them into two parts with opposite electric vector directions, achieving another necessary condition for generating a circularly polarized wave; the microstrip coupling slot feeding structure includes a second dielectric substrate and a third dielectric substrate that overlap vertically, a metal ground layer is located between the second and third dielectric substrates, and a microstrip feed line is located on the bottom surface of the third dielectric substrate; a butterfly-shaped slot is also formed at the center of the metal ground layer; by feeding the antenna radiating structure through the microstrip feed line, the metal ground layer, and the butterfly-shaped slot, a wide-bandwidth circularly polarized wave with strong polarization performance can be generated. Compared to traditional antennas with thick cross-shaped arrays or spiral structures, the millimeter-wave circularly polarized antenna based on orthogonal electric dipoles in this invention has an overall planar structure, which has the advantages of low profile, simple structure, low technical cost, compact layout and easy array formation; at the same time, compared with traditional microstrip antennas, it has the advantages of wide bandwidth and strong polarization performance. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a millimeter-wave circularly polarized antenna based on orthogonal electric dipoles, provided in Embodiment 1 of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the metallic ground layer in the millimeter-wave circularly polarized antenna provided in Embodiment 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of the antenna radiation structure in the millimeter-wave circularly polarized antenna provided in Embodiment 1 of the present invention;

[0029] Figure 4 This is a schematic diagram of the microstrip feed line in the millimeter-wave circularly polarized antenna provided in Embodiment 1 of the present invention;

[0030] Figure 5 A schematic diagram of S11 parameters for a millimeter-wave circularly polarized antenna provided in Embodiment 1 of the present invention;

[0031] Figure 6A schematic diagram of the axial ratio parameters of the millimeter-wave circularly polarized antenna provided in Embodiment 1 of the present invention;

[0032] Figure 7 This is a schematic diagram of the gain direction of the millimeter-wave circularly polarized antenna at 27.5 GHz in the XoZ plane, provided in Embodiment 1 of the present invention.

[0033] Figure 8 This is a schematic diagram of the gain direction of the millimeter-wave circularly polarized antenna in the YoZ plane at 27.5 GHz, provided in Embodiment 1 of the present invention.

[0034] Figure 9 This is a schematic diagram of the gain parameters of the millimeter-wave circularly polarized antenna provided in Embodiment 1 of the present invention. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] The purpose of this invention is to provide a millimeter-wave circularly polarized antenna based on orthogonal electric dipoles, which has the advantages of low profile, wide bandwidth and strong polarization performance compared with traditional antenna structures.

[0037] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Example:

[0039] This embodiment provides a millimeter-wave circularly polarized antenna based on orthogonal electric dipoles, such as... Figure 1 The structure shown, the millimeter-wave circularly polarized antenna includes: an antenna radiating structure and a microstrip coupled slot feeding structure; the antenna radiating structure and the microstrip coupled slot feeding structure are centered in the vertical direction.

[0040] The antenna radiation structure includes: a first dielectric substrate 1, and a first strip patch 5 and a second strip patch 6 located on the upper and lower surfaces of the first dielectric substrate and orthogonal to each other; a slit is provided in the middle of the first strip patch 5 to divide the first strip patch 5 into two parts with opposite electric vector directions; a slit is provided in the middle of the second strip patch 6 to divide the second strip patch 6 into two parts with opposite electric vector directions.

[0041] The microstrip coupled slot feeding structure includes: a second dielectric substrate 2, a third dielectric substrate 3, a metal ground layer 4 located between the second dielectric substrate 2 and the third dielectric substrate 3, and a microstrip feed line 8 located on the bottom surface of the third dielectric substrate 3; a butterfly-shaped slot 7 is formed at the center of the metal ground layer 4; the microstrip coupled slot feeding structure feeds the antenna radiating structure through the microstrip feed line 8, the metal ground layer 4, and the butterfly-shaped slot 7; in this embodiment, as... Figure 2 As shown, the dimensions of the butterfly-shaped slit 7 are: width w = 0.6 mm at both ends of the expansion, length l = 6.7 mm, and width wf = 0.1 mm at the center of the contraction.

[0042] To ensure the antenna structure is simple and easy to manufacture, the first dielectric substrate 1, the second dielectric substrate 2, the metal ground layer 4, and the third dielectric substrate 3 have equal length and width. In this embodiment, the width W of the first dielectric substrate 1, the second dielectric substrate 2, the metal ground layer 4, and the third dielectric substrate 3 is 10 mm, and the length L is 10 mm.

[0043] In one feasible implementation, the thickness of the first dielectric substrate 1 is greater than the thickness of the second dielectric substrate 2, and the second dielectric substrate 2 and the third dielectric substrate 3 have the same thickness, resulting in a significant height difference between the first strip patch 5 and the second strip patch 6. This height difference is used to provide the required 90° phase difference. In this embodiment, the thickness of the first dielectric substrate 1 is h1 = 1.575 mm, the thickness of the second dielectric substrate 2 is h2 = 0.127 mm, and the thickness of the third dielectric substrate 3 is h3 = 0.127 mm. Variations in the thickness of the dielectric substrates affect the frequency band of the axial ratio bandwidth and the frequency band of the return loss, thereby changing the operating frequency band. The axial ratio performance may deteriorate accordingly, but it can be controlled within a small range.

[0044] To better describe the positional relationships of the components in the antenna structure, in actual design, the metal ground layer can be used to construct a rectangular coordinate system OXYZ for the antenna space, with the center of the butterfly slot 7 as the origin O, the extension direction of the butterfly slot 7 as the X-axis, the direction on the metal ground layer perpendicular to the X-axis and passing through the origin O as the Y-axis, and the direction perpendicular to the XOY plane and passing through the origin O as the Z-axis.

[0045] To reduce current reflection and thus improve the antenna's impedance bandwidth and axial ratio bandwidth, in this embodiment, the two ends of the first strip patch 5 are semi-circular; the two ends of the second strip patch 6 are also semi-circular. Figure 3As shown, the dimensions of the first strip patch 5 and the second strip patch are rx = 3.36 mm, the diameter of the semi-circular structure at both ends is r = 0.7 mm, and the gap width f at the center of the first strip patch 5 or the second strip patch 6 is 0.3 mm. a1 represents the angle between the first strip patch 5 and the X-axis, a2 represents the angle between the second strip patch 6 and the X-axis, and the sum of a1 and a2 is a right angle of 90°. In this embodiment, after parameter optimization, the angle a1 between the first strip patch 5 and the X-axis is designed to be 55°, and the angle a2 between the second strip patch 6 and the X-axis is designed to be 35°. The axial ratio bandwidth of such angles is relatively wide. At this time, the first strip patch 5 and the second strip patch 6 are orthogonal to each other. When the feed source is excited, orthogonal electric fields can be generated.

[0046] like Figure 4 As shown, the microstrip feed line 8 includes a first rectangular feed line, a second rectangular feed line, a third rectangular feed line, a fourth rectangular feed line, a fifth rectangular feed line, and a sixth rectangular feed line. The length directions of the first, third, and fourth rectangular feed lines are perpendicular to the extension direction of the butterfly slot 7; the length directions of the second, fifth, and sixth rectangular feed lines are parallel to the extension direction of the butterfly slot 7.

[0047] One end of the first rectangular feed line is connected to the side of the third dielectric substrate 3, and the other end of the first rectangular feed line is connected to the center of the second rectangular feed line. The two ends of the second rectangular feed line are connected to one end of the third rectangular feed line and one end of the fourth rectangular feed line, respectively. The other end of the third rectangular feed line, away from the second rectangular feed line, is connected to one end of the fifth rectangular feed line; the third rectangular feed line is located below the butterfly-shaped slot 7. The other end of the fourth rectangular feed line, away from the second rectangular feed line, is connected to one end of the sixth rectangular feed line; the fourth rectangular feed line is also located below the butterfly-shaped slot 7.

[0048] In this embodiment, the length lk of the first rectangular feed line is 3.5mm, the width wk of the first rectangular feed line is 0.5mm, the length lk1 of the second rectangular feed line is 1.75mm, the length lk2 of the third and fourth rectangular feed lines is 4mm, the length lk3 of the fifth and sixth rectangular feed lines is 0.6mm, and the widths wk1, wk2, wk3 of the second, third, and fourth rectangular feed lines are all 0.25mm.

[0049] In order to feed the metal ground layer 4 through the microstrip feed line 8, the first rectangular feed line is connected to one end of the side of the third dielectric substrate 3, and is also connected to one end of the seventh rectangular feed line. In this embodiment, the width of the seventh rectangular feed line is 0.5 mm, the length of the seventh rectangular feed line is 0.127 mm, the length of the seventh rectangular feed line is the same as the thickness of the third dielectric substrate, and the other end of the seventh rectangular feed line is connected to the metal ground layer 4.

[0050] As mentioned above, the first rectangular feeder, the second rectangular feeder, the third rectangular feeder, the fourth rectangular feeder, the fifth rectangular feeder, the sixth rectangular feeder, and the seventh rectangular feeder can be either a distributed structure or an integrated structure.

[0051] In this embodiment, the first dielectric substrate 1, the second dielectric substrate 2, and the third dielectric substrate 3 are all made of Rogers 5880 dielectric substrate; the dielectric constant of the Rogers 5880 dielectric substrate is 2.2, and the loss tangent tanδ of the Rogers 5880 dielectric substrate is 0.0009; the metal ground layer 4 is made of copper, and the thickness of the metal ground layer 4 is 0.035 mm.

[0052] Of course, this embodiment does not completely limit the materials, dielectric constants, and loss tangents of the first, second, and third dielectric substrates to be exactly the same. The operating frequency can be flexibly controlled by selecting dielectric substrates with different thicknesses and dielectric constants. For example, the dielectric substrate material between the strip patch and the metal ground layer 4 can have a relatively low dielectric constant, which will result in better radiation performance. The dielectric substrate material between the metal ground layer 4 and the microstrip feed line 8 can have a relatively high dielectric constant, which can achieve better coupling effect.

[0053] According to the parameter combination provided in this embodiment, the -10 dB return loss S11 bandwidth of the millimeter-wave circularly polarized antenna can cover the 26.3-28.2 GHz frequency band, and the 3 dB axial ratio bandwidth is 26.8-28.2 GHz. The relative bandwidth is 5.1%. The antenna has a good radiation pattern within the 3 dB axial ratio bandwidth. Schematic diagrams of the return loss S11 parameter and the axial ratio bandwidth AR parameter are shown below. Figure 5-6 The simulation results of the circular polarization pattern are shown below. Figure 7-8 A schematic diagram of the gain parameters for a millimeter-wave circularly polarized antenna can be found here. Figure 9 A stable left-handed circularly polarized gain can be observed. This antenna has a simple and compact structure, making it easy to form an array, fabricate, and integrate.

[0054] Of course, the above-mentioned millimeter-wave circularly polarized antenna can be used not only as a single antenna, but also as an array. In an improved embodiment, a millimeter-wave circularly polarized antenna array is provided, including a number of millimeter-wave circularly polarized antennas based on orthogonal electric dipoles arranged in an array as described above.

[0055] In summary, the millimeter-wave circularly polarized antenna based on orthogonal electric dipoles provided by this invention, compared with traditional antennas with thicker cross-array structures or helical structures, has an overall planar structure, which has the advantages of low profile, simple structure, low technical cost, compact layout and easy array formation; at the same time, compared with traditional microstrip antennas, it has the advantages of wide bandwidth and strong polarization performance.

[0056] Specific examples are used in this article, but the above description is only to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. Those skilled in the art should understand that the various modules or steps of the present invention described above can be implemented using general-purpose computer devices. Optionally, they can be implemented using computer-executable program code, and thus, they can be stored in a storage device for execution by a computer device, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. The present invention is not limited to any specific combination of hardware and software.

[0057] Furthermore, those skilled in the art will recognize that, based on the principles of this invention, there will be variations in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as limiting the invention.

Claims

1. A millimeter-wave circularly polarized antenna based on microstrip coupled slot feeding, characterized in that, The millimeter-wave circularly polarized antenna includes: an antenna radiating structure and a microstrip coupled slot feeding structure; the antenna radiating structure and the microstrip coupled slot feeding structure are center-aligned in the vertical direction; The antenna radiation structure includes: a first dielectric substrate, and a first strip patch and a second strip patch located above and below the first dielectric substrate and orthogonal to each other; a slit is provided in the middle of the first strip patch to divide the first strip patch into two parts with opposite electric vector directions; a slit is provided in the middle of the second strip patch to divide the second strip patch into two parts with opposite electric vector directions. The microstrip coupling slot feeding structure includes: a second dielectric substrate, a third dielectric substrate, a metal ground layer located between the second dielectric substrate and the third dielectric substrate, and a microstrip feed line located on the bottom surface of the third dielectric substrate; a butterfly-shaped slot is formed at the center of the metal ground layer; the microstrip coupling slot feeding structure feeds the antenna radiating structure through the microstrip feed line, the metal ground layer and the butterfly-shaped slot; The thickness of the first dielectric substrate is greater than that of the second dielectric substrate, resulting in a height difference between the first strip patch and the second strip patch. The second dielectric substrate and the third dielectric substrate have the same thickness, resulting in a significant height difference between the first strip patch and the second strip patch. This height difference is used to provide the required 90° phase difference.

2. The millimeter-wave circularly polarized antenna according to claim 1, characterized in that, The length and width of the first dielectric substrate, the second dielectric substrate, the metal ground layer, and the third dielectric substrate are equal.

3. The millimeter-wave circularly polarized antenna according to claim 1, characterized in that, The first strip patch has semi-circular ends; the second strip patch has semi-circular ends.

4. The millimeter-wave circularly polarized antenna according to claim 1, characterized in that, The metallic formation can be used with the center of the butterfly-shaped slot as the origin. O With the butterfly-shaped slit extending in the direction of extension. X Axis, perpendicular to the metal stratum X Axis and passing through the origin O The direction is Y Axis, perpendicular to XOY Plane and passing through the origin O The direction is Z Axis, constructing a Cartesian coordinate system for antenna space OXYZ The first strip patch and X The included angle of the axis is 55°, and the second strip patch is... X The included angle of the shaft is 35°.

5. The millimeter-wave circularly polarized antenna according to claim 1, characterized in that, The microstrip feed line includes a first rectangular feed line, a second rectangular feed line, a third rectangular feed line, a fourth rectangular feed line, a fifth rectangular feed line, and a sixth rectangular feed line; The length directions of the first rectangular feed line, the third rectangular feed line, and the fourth rectangular feed line are perpendicular to the extension direction of the butterfly-shaped slot; the length directions of the second rectangular feed line, the fifth rectangular feed line, and the sixth rectangular feed line are parallel to the extension direction of the butterfly-shaped slot. One end of the first rectangular feed line is connected to the side of the third dielectric substrate, and the other end of the first rectangular feed line is connected to the center of the second rectangular feed line. The two ends of the second rectangular feed line are respectively connected to one end of the third rectangular feed line and one end of the fourth rectangular feed line; The other end of the third rectangular feed line, away from the second rectangular feed line, is connected to one end of the fifth rectangular feed line; the third rectangular feed line is located below the butterfly-shaped gap; The other end of the fourth rectangular feed line, away from the second rectangular feed line, is connected to one end of the sixth rectangular feed line; the fourth rectangular feed line is located below the butterfly-shaped gap.

6. The millimeter-wave circularly polarized antenna according to claim 5, characterized in that, The first rectangular feed line is connected to one end of the side of the third dielectric substrate and is also connected to one end of the seventh rectangular feed line; the other end of the seventh rectangular feed line is connected to the metal ground layer.

7. The millimeter-wave circularly polarized antenna according to claim 6, characterized in that, The first rectangular feed line, the second rectangular feed line, the third rectangular feed line, the fourth rectangular feed line, the fifth rectangular feed line, the sixth rectangular feed line, and the seventh rectangular feed line are an integral structure.

8. The millimeter-wave circularly polarized antenna according to claim 1, characterized in that, The first dielectric substrate, the second dielectric substrate, and the third dielectric substrate are all made of Rogers 5880 dielectric substrate; the dielectric constant of the Rogers 5880 dielectric substrate is 2.2, and the loss tangent tanδ of the Rogers 5880 dielectric substrate is 0.0009; the metal ground layer is made of copper, and the thickness of the metal ground layer is 0.035 mm.

9. A millimeter-wave circularly polarized antenna array, characterized in that, The millimeter-wave circularly polarized antenna array includes a plurality of millimeter-wave circularly polarized antennas based on microstrip coupled slot feeding as described in any one of claims 1-8, arranged in an array configuration.

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