Radiation elements suitable for rotating feed and circularly polarized antennas with rotating feed

Abstract

A radiating unit suitable for rotating feed includes: an insulator probe configured to guide an initial electromagnetic wave from an external circuit to the radiating unit; a bottom radiating unit having a receiving space, the insulator probe extending through the bottom of the bottom radiating unit into the receiving space, the bottom radiating unit including: a bottom patch, the bottom patch including a first ring and a second ring centered on the insulator probe, and two branches disposed between the first ring and the second ring 222, the outer circumference of the second ring having two chamfers symmetrical to the insulator probe, the bottom radiating unit excites the initial electromagnetic wave into two excitation electromagnetic waves with equal amplitude and a 90° phase difference based on the bottom patch, and generates a circularly polarized wave based on the excitation electromagnetic waves; and a top radiating unit disposed on the bottom radiating unit, configured to radiate the circularly polarized wave into free space.

Description

Technical Field

[0001] This invention relates to the field of patch antenna technology, and more particularly to a wideband radiating element suitable for rotating feed and a wideband circularly polarized patch antenna with rotating feed. Background Technology

[0002] Sequential rotational feeding is a common method to improve the axial ratio of circularly polarized array antennas. However, in the process of achieving circular polarization using rotational feeding, interference can occur between patches, and cross-polarization can suffer significant degradation, which is detrimental to communication between phased array radar systems. Summary of the Invention

[0003] To at least partially overcome the technical defects of at least one or other inventions mentioned above, at least one embodiment of the present invention provides a radiating element suitable for rotating feed and a circularly polarized antenna for rotating feed. By setting two stubs between the first and second rings of the bottom patch, the initial electromagnetic wave can be divided into two streams. By setting two chamfers, the two electromagnetic waves can be excited into two excitation electromagnetic waves with equal amplitude and a 90° phase difference. Furthermore, by setting the insulator probe at the center position, the mutual interference of each radiating element after rotating feed can be eliminated, thereby achieving the generation of a circularly polarized wave with better circular polarization performance.

[0004] According to one aspect of the present invention, a radiating unit suitable for rotating feed is provided, comprising: an insulator probe configured to guide an initial electromagnetic wave from an external circuit to the radiating unit; a bottom radiating unit having a receiving space, the insulator probe extending through the bottom of the bottom radiating unit into the receiving space, the bottom radiating unit comprising: a bottom patch comprising a first ring, a second ring centered on the insulator probe, and two branches disposed between the first ring and the second ring, the outer circumference of the second ring having two chamfers symmetrical to the insulator probe, the bottom radiating unit exciting the initial electromagnetic wave into two excitation electromagnetic waves with equal amplitude and a 90° phase difference based on the bottom patch and generating a circularly polarized wave based on the excitation electromagnetic waves; and a top radiating unit disposed on the bottom radiating unit and configured to radiate the circularly polarized wave into free space.

[0005] In this embodiment of the invention, it further includes: a plurality of metallized vias uniformly disposed on the periphery of the bottom radiating unit and extending toward the top radiating unit, wherein the metallized vias generate induced magnetic current based on the excitation electromagnetic wave and generate induced electromagnetic wave based on the induced magnetic current.

[0006] In this embodiment of the invention, the bottom radiating unit further includes: a ground plane disposed at the bottom of the bottom radiating unit, wherein the insulator probe extends through the ground plane into the receiving space; a first dielectric layer disposed on the ground plane, wherein the bottom patch is disposed on the side of the first dielectric layer opposite to the ground plane, wherein the insulator probe extends through the first dielectric layer and the first annulus into the receiving space; and an annular second dielectric layer disposed on the bottom patch and forming the receiving space with the first dielectric layer, wherein the metallized via passes through the second dielectric layer in parallel.

[0007] In this embodiment of the invention, the top-level radiating unit includes: a third dielectric layer disposed on the bottom-level radiating unit, the third dielectric layer covering the accommodating space; a top patch disposed on the third dielectric layer, the central axis of the top patch coinciding with that of the bottom patch; and a top metal layer, the top metal layer being arranged in a ring structure on the periphery of the third dielectric layer and electrically connected to the ground plane through the metallized via, the top metal layer, the top patch, and the third dielectric layer forming a top-level radiating structure to radiate the circularly polarized wave into free space.

[0008] In this embodiment of the invention, the underlying radiating unit further includes: an adhesive layer, which is arranged in a ring structure between the underlying patch and the second dielectric layer and is configured to electrically isolate the underlying patch and the second dielectric layer.

[0009] In this embodiment of the invention, the position of the chamfer is set by electromagnetic simulation so that the amplitudes of the two excitation electromagnetic waves are equal and their phases differ by 90°.

[0010] In this embodiment of the invention, a conductive adhesive film is also included, configured to bond the bottom radiating unit and the top radiating unit.

[0011] In this embodiment of the invention, the first dielectric layer and / or the second dielectric layer are board materials.

[0012] According to another aspect of the present invention, a rotating-fed circularly polarized antenna is provided, comprising: four sub-antenna elements, each sub-antenna element comprising four × four radiating elements as described in any one of claims 1 to 8, such that the 64 radiating elements are rotatedly distributed in an 8 × 8 array; and a transceiver assembly configured to be connected to an external circuit, the transceiver assembly having a through-hole, an insulator probe passing through the through-hole to the receiving space, the initial electromagnetic wave being guided by the insulator probe and transmitted by the external circuit through the through-hole to the bottom radiating element, the radiating elements respectively covering the through-hole.

[0013] In an embodiment of the invention, two adjacent radiating elements in the row or column direction are rotated N×45 relative to each other. o , where N is 1, 2, or 3.

[0014] According to embodiments of this disclosure, by setting the insulator probe as the center of the first and second rings, the insulator probe is positioned at the center of the radiating unit. This means that the feed point of the radiating unit is located at the center of the radiating unit. The initial electromagnetic wave is divided into two streams at the two branches, and a perturbation structure is formed by setting two symmetrical chamfers to disturb the propagation of the electromagnetic wave. In this way, the two electromagnetic waves can be excited into two excitation electromagnetic waves with equal amplitude and a 90° phase difference. Since setting the feed point at the center of the radiating unit can eliminate the mutual interference of the radiating unit after rotational feeding, a circularly polarized wave with good symmetry can be radiated. Attached Figure Description

[0015] Figure 1 This is a perspective view of a radiating unit suitable for rotating feeding according to an illustrative embodiment of the present invention;

[0016] Figure 2 This is a top view of a radiating unit adapted for rotating feeding according to an illustrative embodiment of the present invention;

[0017] Figure 3 This is a cross-sectional view of a radiating unit suitable for rotating feed according to an illustrative embodiment of the present invention;

[0018] Figure 4 This is a top view of the bottom patch of a radiating unit suitable for rotating feeding according to an illustrative embodiment of the present invention;

[0019] Figure 5 This is a top view of a radiating unit suitable for rotating feed according to an illustrative embodiment of the present invention after removing the bottom patch and insulator probe;

[0020] Figure 6 This is a top view of a rotary-fed circularly polarized antenna according to an illustrative embodiment of the present invention;

[0021] Figure 7 This is a simulation result diagram of the standing wave ratio of the radiating element in a rotating-fed circularly polarized antenna according to an illustrative embodiment of the present invention.

[0022] Figure 8 This is a simulation result diagram of the axial ratio of the radiating element in a rotating-fed circularly polarized antenna according to an illustrative embodiment of the present invention;

[0023] Figure 9 This is a simulation result of the directivity of the normal of a circularly polarized antenna with rotating feed according to an illustrative embodiment of the present invention;

[0024] Figure 10 This is a simulation result of the directional power of a circularly polarized antenna with rotating feed scanning 60° according to an illustrative embodiment of the present invention.

[0025] Figure 11 This is a diagram showing the measured directivity of a circularly polarized antenna with rotating feed according to an illustrative embodiment of the present invention;

[0026] Figure 12 This is a diagram showing the measured directivity of a circularly polarized antenna with rotating feed according to an illustrative embodiment of the present invention, scanned over 60°; and

[0027] Figure 13 This is a diagram showing the test results of the axial ratio of the radiating element in a rotating-fed circularly polarized antenna according to an illustrative embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures

[0029] 1: Insulator probe;

[0030] 2: Bottom-layer radiating unit;

[0031] 21: Accommodation space;

[0032] 22: Bottom layer patch;

[0033] 23: Grounding plane;

[0034] 24: First dielectric layer;

[0035] 25: Second dielectric layer;

[0036] 26: Adhesive layer;

[0037] 3: Top-level radiating unit;

[0038] 31: Third dielectric layer;

[0039] 32: Top layer tile;

[0040] 33: Top metal layer;

[0041] 4: Metallized vias;

[0042] 5: Conductive adhesive film;

[0043] 6: Transceiver components;

[0044] 7: Sub-antenna element. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. However, the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided to make the disclosure thorough and complete, and to fully convey the scope of the invention to those skilled in the art. In the accompanying drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated, and the same reference numerals denote the same elements throughout.

[0046] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0047] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms "comprising," "including," etc., as used herein indicate the presence of the above-described features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0048] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0049] To facilitate understanding of the technical solutions of this invention by those skilled in the art, the following technical terms are explained below.

[0050] When using expressions such as "at least one of A, B, and C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). When using expressions such as "at least one of A, B, or C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0051] Figure 1 This is a perspective view of a radiating unit suitable for rotating feed according to an illustrative embodiment of the present invention. Figure 2 This is a top view of a radiating unit adapted for rotating feeding according to an illustrative embodiment of the present invention. Figure 3 This is a cross-sectional view of a radiating unit suitable for rotating feed according to an illustrative embodiment of the present invention.

[0052] like Figures 1 to 3 As shown, an embodiment of the present invention provides a radiating unit suitable for rotating feed, comprising: an insulator probe 1, a bottom radiating unit 2, and a top radiating unit 3.

[0053] Specifically, the insulator probe 1 is configured to guide the initial electromagnetic wave from the external circuit to the radiating unit. The bottom radiating unit 2 has a receiving space 21, through which the insulator probe 1 passes ( ). Figure 3 The bottom of the middle and lower layer radiating unit 2 extends into the receiving space 21. The bottom layer radiating unit 2 includes a bottom layer patch 22. The top layer radiating unit 3 is disposed on the bottom layer radiating unit 2 and is configured to radiate circularly polarized waves into free space.

[0054] Figure 4 This is a top view of the bottom patch 22 of a radiating unit suitable for rotating feeding according to an illustrative embodiment of the present invention.

[0055] Furthermore, such as Figure 3 and Figure 4 As shown, the bottom patch 22 includes a first ring and a second ring with the insulator probe 1 as the center, and two branches disposed between the first ring and the second ring. The second ring has two chamfers with the insulator probe 1 as the symmetrical point. The bottom radiation unit 2 excites the initial electromagnetic wave into two excitation electromagnetic waves with equal amplitude and 90° phase difference based on the bottom patch 22, and generates a circularly polarized wave based on the excitation electromagnetic waves.

[0056] According to the embodiments of this disclosure, by setting the insulator probe 1 as the center of the first ring and the second ring, the insulator probe 1 is located at the center of the radiation unit. Even if the feed point of the radiation unit is located at the center of the radiation unit, the initial electromagnetic wave is divided into two strands at the two branches and a perturbation structure is formed by setting two symmetrical chamfers to disturb the propagation of the electromagnetic wave. In this way, the two electromagnetic waves can be excited into two excitation electromagnetic waves with equal amplitude and a 90° phase difference. Since setting the feed point at the center of the radiation unit can eliminate the mutual interference of the radiation unit after rotational feeding, it can radiate a circularly polarized wave with better symmetry.

[0057] In some embodiments, the radiating unit further includes a plurality of metallized vias 4. The metallized vias 4 are uniformly disposed around the periphery of the bottom radiating unit 2 and extend towards the top radiating unit 3. The metallized vias 4 generate an induced magnetic current based on the excitation electromagnetic wave, and generate an induced electromagnetic wave based on the induced magnetic current. For example... Figure 2 and Figure 3 As shown, the metallized via 4 can be a hollow cylindrical structure. The metallized via 4 can be made of metal and is evenly arranged on the periphery of the bottom radiation unit 2 and the top radiation unit 3, and penetrates the bottom radiation unit 2 and the top radiation unit 3.

[0058] Furthermore, after the initial electromagnetic wave is guided to the bottom patch 22 by the insulator probe 1, it becomes two excitation electromagnetic waves. These excitation electromagnetic waves pass through the bottom patch 22 and enter the receiving space 21. The metallized via 4 is excited by the electromagnetic waves, forming an induced magnetic current, which in turn generates induced electromagnetic waves. Due to the cylindrical structure of the metallized via 4 and its uniform distribution around the bottom radiating unit 2 and the top radiating unit 3, a structure similar to a metal wall can be formed, generating induced electromagnetic waves with a wider beamwidth, thereby increasing the overall beamwidth of the electromagnetic waves radiated by the radiating unit. Furthermore, by setting the receiving space 21, the operating bandwidth of the radiating unit can be increased.

[0059] In some embodiments, the bottom radiating unit 2 further includes a ground plane 23, a first dielectric layer 24, and an annular second dielectric layer 25.

[0060] Specifically, such as Figure 3 As shown, a grounding plane 23 is located at the bottom of the bottom radiating unit 2. An insulator probe 1 extends through the grounding plane 23 into the receiving space 21. The grounding plane 23 is made of metal and is configured to isolate external electromagnetic interference. A bottom patch 22 is located on the side of the first dielectric layer 24 opposite to the grounding plane. The insulator probe 1 extends through the first dielectric layer 24 and the first ring into the receiving space 21. A second dielectric layer 25 is located on the bottom patch 22 and forms the receiving space 21 with the first dielectric layer 24. The metallized via 4 passes parallel to the second dielectric layer. An initial electromagnetic wave is guided from the first dielectric layer 24 by the insulator probe 1 to the bottom patch 22. From the bottom patch 22, it transforms into two excitation electromagnetic waves, which are then radiated into the receiving space 21 and the second dielectric layer 25, forming a circularly polarized wave. The metallized via 4 is excited by the electromagnetic wave, forming an induced magnetic current, which in turn generates an induced electromagnetic wave. The induced electromagnetic wave and the circularly polarized wave are radiated into free space through the top radiating unit 3. The top metal layer 33 can be electrically connected to the grounding plane 23 through the metallized via 4. The metallized via 4 can penetrate the top metal layer 33, the top radiating unit 3 and the bottom radiating unit 2 to the ground plane 23.

[0061] Figure 5This is a top view of a radiating unit suitable for rotating feed according to an illustrative embodiment of the present invention, after removing the bottom patch and insulator probe.

[0062] In some embodiments, the top radiating unit 3 includes a third dielectric layer 31, a top patch 32, and a top metal layer 33.

[0063] Specifically, such as Figure 3 As shown, a third dielectric layer 31 is disposed on the bottom radiating unit 2, covering the accommodating space 21. A top patch 32 is disposed on the third dielectric layer 31, with its central axis coinciding with that of the bottom patch 22. A top metal layer 33 is arranged in a ring structure on the periphery of the third dielectric layer 31 and electrically connected to the ground plane through the metallized via. The top metal layer 33, the top patch 32, and the third dielectric layer 31 form a top radiating structure to radiate circularly polarized waves into free space. Increasing the top patch 32 increases the cross-section of the radiating unit, thereby widening the operating bandwidth and improving radiation efficiency. Induced electromagnetic waves and circularly polarized waves are radiated into free space through the third dielectric layer 31 of the top radiating unit 3. The metallized via 4 can penetrate the top metal layer 33, the top radiating unit 3, and the bottom radiating unit 2. By coupling the energy of the electromagnetic waves to the top patch 32, the impedance bandwidth and frequency bandwidth of the radiating unit can be widened.

[0064] like Figure 3 As shown, in some embodiments, the bottom radiating unit 2 further includes an adhesive layer 26. The adhesive layer 26 is disposed in a ring structure between the bottom patch 22 and the second dielectric layer 25, and is configured to electrically isolate the bottom patch 22 and the second dielectric layer 25 and to bond the bottom patch 22 and the second dielectric layer 25.

[0065] In some embodiments, the position of the chamfer can be set by electromagnetic simulation so that the amplitudes of the two excitation electromagnetic waves are equal and their phases differ by 90°.

[0066] In some embodiments, the radiating unit further includes a conductive adhesive film 5, configured to bond the bottom radiating unit 2 and the top radiating unit 3.

[0067] In some embodiments, at least one of the first dielectric layer 24, the second dielectric layer 25, and the third dielectric layer 31 can be a substrate suitable for multilayer boards, such as the high-frequency substrate TSM-DS3. At least one of the metallized via 4, the insulator probe 1, the bottom patch 22, the top patch 32, and the top metal layer 33 can be made of metal, for example, copper.

[0068] Figure 6 This is a top view of a rotary-fed circularly polarized antenna according to an illustrative embodiment of the present invention.

[0069] like Figure 6 As shown, an embodiment of the present invention also provides a rotating-fed circularly polarized antenna, including four sub-antenna elements 7 and a transceiver assembly 6.

[0070] Specifically, there are four sub-antenna elements 7, each including 4×4 radiating elements as described above, resulting in a 64-eight-eight rotating array of radiating elements. Multiple transceiver components 6 are configured to connect to external circuitry. Each transceiver component 6 has through-holes through which an insulator probe 1 passes to the receiving space 21. The initial electromagnetic wave, guided by the insulator probe 1, is transmitted from the external circuitry through the through-holes to the bottom-layer radiating element 2, with each radiating element covering one of the through-holes. Isolation can be improved for each antenna element through its internal metallized vias 4.

[0071] In some embodiments, two adjacent radiating elements in the row or column direction are rotated N×45° relative to each other, where N is 1, 2, or 3.

[0072] Rotational distribution can be as follows Figure 6 As shown, the last three radiating elements in the first column of the sub-antenna element 7 can be obtained by rotating the first radiating element by 135°, 45°, and 90°, respectively. The rotation distribution can be as follows: Figure 6 As shown, the 16 radiating elements in sub-antenna element 7 are centrally symmetrically distributed. The distribution of the four sub-antenna elements 7 can be identical, which can improve the symmetry of the antenna to compensate for the spatial phase difference of the radiating elements, maintain good circular polarization performance in a large angular domain in the E-plane (electric field) and H-plane (magnetic field), and reduce the deterioration of cross-polarization in the D-plane (oblique plane).

[0073] Figure 7 This is a simulation result diagram of the standing wave ratio (SWR) of the radiating element in a rotating-fed circularly polarized antenna according to an illustrative embodiment of the present invention.

[0074] Figure 8 This is a simulation result diagram of the axial ratio of the radiating element in a rotating-fed circularly polarized antenna according to an illustrative embodiment of the present invention.

[0075] like Figure 7 and Figure 8 As shown, within a bandwidth range of 3.5 GHz from 24.5 to 28 GHz, the VSWR of the radiating element in the circularly polarized antenna is below 1.5 and the axial ratio is below 6 dB. Therefore, the radiating element has an impedance bandwidth and axial ratio bandwidth of more than 13%, and also has the operating characteristics of a wide bandwidth axial ratio.

[0076] Figure 9 This is a simulation result of the normal directionality of a circularly polarized antenna with rotating feed according to an illustrative embodiment of the present invention.

[0077] Figure 10 This is a simulation result of the directivity of a circularly polarized antenna with rotating feed scanning 60° according to an illustrative embodiment of the present invention.

[0078] like Figure 9 and Figure 10 As shown, the gain of the circularly polarized antenna decreases by about 3dB when scanning 60° compared to the gain in the normal direction, while the roll-off of the conventional antenna is more than 4dB. Therefore, the radiating element has the ability to scan wide angles.

[0079] Figure 11 This is a diagram showing the measured directivity of a circularly polarized antenna with rotating feed according to an illustrative embodiment of the present invention.

[0080] Figure 12 This is a diagram showing the measured directivity of a circularly polarized antenna with rotating feed, according to an illustrative embodiment of the present invention, scanning 60°.

[0081] Figure 13 This is a diagram showing the test results of the axial ratio of the radiating element in a rotating-fed circularly polarized antenna according to an illustrative embodiment of the present invention.

[0082] like Figures 8 to 13 As shown, the simulation and actual measurement have good agreement. Therefore, the circularly polarized antenna has the characteristics of wide bandwidth, wide beam, and wide axial ratio bandwidth, and can radiate circularly polarized waves with wide bandwidth, wide beam, and wide axial ratio.

[0083] It should be noted that the above description is based on the perspective of the radiating unit radiating electromagnetic waves into free space. Similarly, the radiating unit can also receive electromagnetic waves from free space. The receiving path of the electromagnetic waves is opposite to the radiation path, and the received electromagnetic waves are also circularly polarized waves with wide bandwidth, wide beam, and wide axis ratio. This will not be elaborated further here.

[0084] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of the present invention. Throughout the accompanying drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding the present invention, and the shapes and dimensions of the components in the drawings do not reflect actual size and proportion, but are only schematic representations of the embodiments of the present invention.

[0085] Unless otherwise stated, the numerical parameters in this specification and the appended claims are approximate values ​​and can be varied according to the desired characteristics obtained from the content of this invention. Specifically, all figures used in the specification and claims to indicate the content of components, reaction conditions, etc., should be understood to be modified by the term "about" in all cases. Generally, this means that there may be variations of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments.

[0086] The use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify the corresponding elements does not imply that the element has any ordinal number, nor does it represent the order of one element with another element, or the order of manufacturing methods. The use of these ordinal numbers is only to enable a named element to be clearly distinguished from another element with the same name.

[0087] Furthermore, unless specifically described or required to occur in a specific order, the order of the above steps is not limited to those listed above and can be varied or rearranged according to the desired design. Moreover, the above embodiments can be used in combination with each other or with other embodiments based on design and reliability considerations; that is, technical features from different embodiments can be freely combined to form more embodiments.

[0088] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A radiating element suitable for rotating feed, comprising: An insulator probe is configured to guide initial electromagnetic waves from an external circuit to the radiating element; The bottom radiating unit has a receiving space, and the insulator probe extends through the bottom of the bottom radiating unit into the receiving space. The bottom radiating unit includes: A bottom layer patch includes a first ring and a second ring centered on the insulator probe, and two branches disposed between the first and second rings. The outer circumference of the second ring has two chamfered corners symmetrical to the insulator probe. The bottom layer radiation unit, based on the bottom layer patch, excites the initial electromagnetic wave into two excitation electromagnetic waves with equal amplitude and a 90° phase difference, and generates a circularly polarized wave based on the excitation electromagnetic waves. The top-level radiating unit, disposed on the bottom-level radiating unit, is configured to radiate the circularly polarized wave into free space; The radiating unit suitable for rotating feed also includes: Multiple metallized vias are uniformly disposed around the bottom radiating unit and extend toward the top radiating unit. The metallized vias generate induced magnetic current based on the excitation electromagnetic wave and generate induced electromagnetic wave based on the induced magnetic current. The underlying radiating unit also includes: A grounding plane is provided at the bottom of the bottom radiating unit, and the insulator probe extends through the grounding plane into the receiving space; A first dielectric layer is disposed on the grounding plane, and a bottom patch is disposed on the side of the first dielectric layer opposite to the grounding plane. The insulator probe extends through the first dielectric layer and the first annulus into the receiving space. A ring-shaped second dielectric layer is disposed on the bottom patch and forms the receiving space with the first dielectric layer, and the metallized via passes through the second dielectric layer in parallel.

2. The radiating unit according to claim 1, characterized in that, The top-level radiating unit includes: A third dielectric layer is disposed on the bottom radiating unit, and the third dielectric layer covers the accommodating space; A top-layer patch is disposed on the third dielectric layer, wherein the central axis of the top-layer patch coincides with that of the bottom-layer patch; and A top metal layer is arranged in a ring structure on the periphery of the third dielectric layer and electrically connected to the ground plane through the metallized via. The top metal layer, the top patch, and the third dielectric layer form a top radiation structure to radiate the circularly polarized wave into free space.

3. The radiating element according to claim 1, characterized in that, The underlying radiating unit also includes: An adhesive layer, arranged in a ring structure, is disposed between the bottom patch and the second dielectric layer and is configured to electrically isolate the bottom patch and the second dielectric layer.

4. The radiating unit according to claim 1, characterized in that, The position of the chamfer is set by electromagnetic simulation so that the amplitudes of the two excitation electromagnetic waves are equal and their phases differ by 90°.

5. The radiating element according to claim 1, characterized in that, It also includes a conductive adhesive film configured to bond the bottom radiating unit and the top radiating unit.

6. The radiating element according to claim 1, characterized in that, The first dielectric layer and / or the second dielectric layer are substrates.

7. A rotating-fed circularly polarized antenna, comprising: Four sub-antenna elements, each of the sub-antenna elements comprising 4×4 radiating elements as described in any one of claims 1 to 6 above, such that the 64 radiating elements are rotated and distributed in an 8×8 array. as well as A transceiver assembly is configured to connect to an external circuit. The transceiver assembly has a through-hole. An insulator probe passes through the through-hole to the receiving space. The initial electromagnetic wave is transmitted from the external circuit through the through-hole to the bottom radiation unit under the guidance of the insulator probe. The radiation units cover the through-hole respectively.

8. The rotating-fed circularly polarized antenna as described in claim 7, characterized in that, Two adjacent radiating elements in the row or column direction are rotated relative to each other by N×45. o , where N is 1, 2, or 3.

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