Dual circular polarized antenna structure

Abstract

A dual circularly polarized antenna structure includes a substrate, M antenna arrays, and a feeding module. Each antenna array includes two first antennas and two second antennas. Each of the two first antennas and the two second antennas includes two sub-antennas and two microstrip lines electrically coupled to the two sub-antennas. The two sub-antennas of the first antenna have a translational overlapping relationship. The two sub-antennas of the second antenna have a translational overlapping relationship. The two first antennas and the two second antennas have a center point. Each of the two sub-antennas of the two first antennas and each of the two sub-antennas of the two second antennas is adjacent to the center point and has a 90-degree rotational symmetry about the center point. The feeding module is electrically coupled to the M antenna arrays to generate a first circular polarization and a second circular polarization with opposite rotation directions.

Description

Technical Field

[0001] The present invention relates to an antenna structure, in particular to a dual circular polarization antenna structure. Background Art

[0002] While existing antenna structures achieve circular polarization, they still have numerous drawbacks. For example, existing antenna structures can generate circular polarization by using two dual-feed phase shifters on each antenna. However, the high cost of these phase shifters makes these antenna structures expensive. For another example, existing antenna structures can achieve circular polarization by using a power divider to feed a 90-degree phase difference between the antennas, but this results in significant losses.

[0003] Therefore, the inventors believe that the above defects can be improved, and have devoted themselves to research and applied scientific principles to finally propose the present invention which has a reasonable design and effectively improves the above defects. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a dual circular polarization antenna structure in view of the deficiencies in the prior art.

[0005] An embodiment of the present invention discloses a dual circularly polarized antenna structure, comprising: a substrate comprising a first extension direction and a second extension direction perpendicular to the first extension direction; M antenna arrays, arranged on the substrate, where M is a positive integer not less than 1, and the M antenna arrays comprise: two first antennas, each comprising: two first sub-antennas, arranged along the first extension direction and each comprising a first body, and a first receiving contact and a first transmission contact arranged on the first body, and one of the first sub-antennas can overlap the other first sub-antenna when moving along the first extension direction; and two first microstrip lines, one of the first microstrip lines is electrically coupled to the first receiving contacts of the two first sub-antennas and has a first receiving feed point, and the other first microstrip line is electrically coupled to the first transmission contacts of the two first sub-antennas and has a first transmission feed point; and two second antennas, each comprising: two second sub-antennas, arranged along the second extension direction. The antenna arrays are configured in an extending direction and each include a second body, a second receiving contact and a second transmitting contact arranged on the second body, and one of the second sub-antennas can overlap another second sub-antenna when moving along the second extending direction; and two second microstrip lines, one of the second microstrip lines is electrically coupled to the second receiving contacts of the two second sub-antennas and has a second receiving feed point, and the other second microstrip line is electrically coupled to the second transmitting contacts of the two second sub-antennas and has a second transmitting feed point; wherein, there is a center point between the two first antennas and the two second antennas, and one of the first sub-antennas of the two first antennas and one of the second sub-antennas of the two second antennas are adjacent to the center point and are rotationally symmetrical at 90 degrees about the center point; and a feeding module electrically coupled to each of the M antenna arrays to generate a first circular polarization and a second circular polarization with opposite rotation directions.

[0006] Preferably, there is a 180-degree phase difference between the first receiving feed points of the two first antennas and between the second receiving feed points of the two second antennas, and there is a 90-degree phase difference between each first receiving feed point and any second receiving feed point; there is a 180-degree phase difference between the first transmitting feed points of the two first antennas and between the second transmitting feed points of the two second antennas, and there is a 90-degree phase difference between each first transmitting feed point and any second transmitting feed point.

[0007] Preferably, the two first receiving feed points and the two second receiving feed points can jointly generate the first circular polarization through the feeding module, and the two first transmitting feed points and the two second transmitting feed points can jointly generate the second circular polarization through the feeding module.

[0008] Preferably, the feeding module further includes N receiving chips and N transmitting chips, M is 2N, and N is a positive integer not less than 1; each receiving chip is arranged between any two adjacent antenna arrays to electrically couple each first receiving feed point and each second receiving feed point of the two antenna arrays; each transmitting chip is arranged between any two adjacent antenna arrays to electrically couple each first transmitting feed point and each second transmitting feed point of the two antenna arrays.

[0009] Preferably, the feeding module includes M beamforming chips; the M beamforming chips are respectively arranged at the center points of the M antenna arrays, and the M beamforming chips are respectively electrically coupled to the two first receiving feed points, two second receiving feed points, two first transmitting feed points, and two second transmitting feed points of the M antenna arrays.

[0010] Preferably, the dual circularly polarized antenna structure is suitable for a transmission frequency band; the first bodies of the two first antennas and the second bodies of the two second antennas are respectively hexagonal, having six sides; among the six sides, any two of the sides that are positioned opposite to each other are parallel to each other and have a first shortest distance, and the first shortest distance is between 0.45 and 0.55 times the wavelength corresponding to a center frequency of the transmission frequency band.

[0011] Preferably, a position where the first transmission feed point is projected onto the first body is adjacent to one of the side edges and has a second shortest distance, a position where the first reception feed point is projected onto the first body is adjacent to one of the side edges and has a third shortest distance, and the second shortest distance is smaller than the third shortest distance.

[0012] Preferably, a position where the second transmission feed point is projected onto the second body is adjacent to one of the side edges and has a second shortest distance, and a position where the second reception feed point is projected onto the second body is adjacent to one of the side edges and has a third shortest distance, and the second shortest distance is smaller than the third shortest distance.

[0013] In summary, the dual circularly polarized antenna structure disclosed in the embodiment of the present invention can reduce costs and reduce losses through the designs of "one of the first sub-antennas can overlap the other first sub-antenna when moving along the first extension direction, and one of the second sub-antennas can overlap the other second sub-antenna when moving along the second extension direction", and "one of the first sub-antennas of each of the two first antennas and one of the second sub-antennas of each of the two second antennas are adjacent to the center point and are rotationally symmetrical at 90 degrees about the center point".

[0014] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and illustration and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a planar schematic diagram of the dual circularly polarized antenna structure of the present invention.

[0016] Figure 2 FIG. 4 is a plan view of the antenna array of the present invention.

[0017] Figure 3 FIG. 4 is a plan view of the first antenna of the present invention.

[0018] Figure 4 Schematic cross-sectional view of the first antenna of the present invention.

[0019] Figure 5 FIG. 4 is a plan view of the second antenna of the present invention.

[0020] Figure 6 It is a schematic three-dimensional diagram of the first circular polarization of the present invention.

[0021] Figure 7 It is a three-dimensional schematic diagram of the second circular polarization of the present invention.

[0022] Figure 8 FIG. 4 is a schematic diagram of the return loss of the first receiving feed point and the second receiving feed point of the present invention.

[0023] Figure 9 FIG. 4 is a schematic diagram of the return loss of the first transmission feeding point and the second transmission feeding point of the present invention.

[0024] Figure 10 FIG. 4 is a plan view of another embodiment of the dual circularly polarized antenna structure of the present invention.

[0025] Figure 11 FIG. 4 is another plan view of the dual circularly polarized antenna structure of the present invention in another aspect.

[0026] 100: Dual circular polarization antenna structure

[0027] 1: Substrate

[0028] 11, 12: Side

[0029] 2: Antenna array

[0030] 21: First Antenna

[0031] 211: First sub-antenna

[0032] 2111: The first ontology

[0033] 2112: First receiving contact

[0034] 2113: First transmission point

[0035] 212: First microstrip line

[0036] 2121: First receiving feed point 2122: First transmitting feed point 22: Second antenna

[0037] 221: Second sub-antenna

[0038] 2211: Second Body

[0039] 2212: Second receiving contact

[0040] 2213: Second transmission point

[0041] 222: Second microstrip line

[0042] 2221: Second receiving feed point 2222: Second transmitting feed point 3: Feed module

[0043] 31: Beamforming chip

[0044] 32: receiving chip 33: transmitting chip

[0045] D 1: First extension direction

[0046] D2: Second extension direction

[0047] S1: First shortest distance

[0048] S2: The second shortest distance

[0049] S3: The third shortest distance

[0050] C: Center point

[0051] G1: Value line

[0052] E 1: First side

[0053] E2: Second side

[0054] E3: Third side

[0055] E4: Fourth side

[0056] E5: Fifth side

[0057] E6: Sixth side

[0058] HCP 1: first circular polarization HCP2: second circular polarization DETAILED DESCRIPTION

[0059] The following is an explanation of the implementation of the "dual circularly polarized antenna structure" disclosed in the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual size. Please note in advance. The following embodiments will further explain the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of protection of the present invention.

[0060] It should be understood that while terms such as "first," "second," and "third" may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used herein may include any one or more combinations of the associated listed items, as appropriate.

[0061] In addition, in the following description, if it is indicated to refer to a specific figure or as shown in a specific figure, it is only used to emphasize that most of the relevant content described in the subsequent description appears in the specific figure, but it does not limit the subsequent description to only referring to the specific figure.

[0062] See Figures 1 to 11 As shown, this embodiment provides a dual circular polarization antenna structure 100, which is suitable for a transmission frequency band and can simultaneously generate a first circular polarization HCP1 and a second circular polarization HCP2 with opposite rotation directions (such as Figure 6 and Figure 7 In other words, any antenna structure that cannot simultaneously generate two circular polarizations with opposite rotation directions is not the dual circular polarization antenna structure 100 referred to in the present invention.

[0063] like Figure 1 and Figure 2 As shown, the dual circularly polarized antenna structure 100 includes a substrate 1, M antenna arrays 2 (M is a positive integer not less than 1) and a feed module 3 disposed on the substrate 1. Next, the components of the dual circularly polarized antenna structure 100 and their connections are described below.

[0064] Re-parameter Figure 1 and Figure 4As shown, in this embodiment, the substrate 1 is made of an insulating material and can be, for example, a rectangular plate-shaped structure. Furthermore, the substrate 1 has a first extension direction D1 and a second extension direction D2 perpendicular to the first extension direction D1. In this embodiment, the first extension direction D1 is the length of the substrate 1, and the second extension direction D2 is the width of the substrate 1, but the present invention is not limited to these directions.

[0065] Cooperate Figures 1 to 3 As shown, each of the M antenna arrays 2 includes two first antennas 21 and two second antennas 22 that are spaced apart from each other. Figure 1 The example of four antenna arrays 2 is shown (i.e., M is 4), but the present invention is not limited thereto. Each first antenna 21 includes two first sub-antennas 211 and two first microstrip lines 212, and each second antenna 22 includes two second sub-antennas 221 and two second microstrip lines 222.

[0066] Specifically, one of the first sub-antennas 211 can overlap another first sub-antenna 211 when moving along the first extension direction D1. Each first sub-antenna 211 includes a first body 2111, a first receiving contact 2112, and a first transmitting contact 2113 disposed on the first body 2111. In this embodiment, the first body 2111 is a hexagonal conductive copper foil having six sides. Any two opposing sides are parallel to each other and have a first minimum distance S1. The first minimum distance S1 is preferably between 0.45 and 0.55 times the wavelength corresponding to a center frequency of the transmission frequency band.

[0067] For example, Figure 3 Taking the first sub-antenna 211 located at the top of the paper as an example, the first body 2111 has, in clockwise order, a first side E1, a second side E2, a third side E3, a fourth side E4, a fifth side E5, and a sixth side E6. The first side E1 and the fourth side E4 are positioned opposite and parallel to each other, the second side E2 and the fifth side E5 are positioned opposite and parallel to each other, and the third side E3 and the sixth side E6 are positioned opposite and parallel to each other. When the wavelength corresponding to the center frequency of the transmission band is 12 millimeters (mm), the shortest distance between the first side E1 and the fourth side E4, the shortest distance between the second side E2 and the fifth side E5, and the shortest distance between the third side E3 and the sixth side E6 can be between 5.4 millimeters (mm) and 6.6 millimeters (mm), but the present invention is not limited thereto.

[0068] Re-parameter Figure 3 and Figure 4 As shown, in this embodiment, the first receiving contact 2112 and the first transmitting contact 2113 can each be a conductive via, and the first receiving contact 2112 and the first transmitting contact 2113 are respectively disposed on the first body 2111 and spaced apart from each other. The first receiving contact 2112 and the first transmitting contact 2113 are electrically coupled to the feeding module 3, and the first transmitting contact 2113 is used for transmission (i.e., TX), while the first receiving contact 2112 is used for reception (i.e., RX).

[0069] Looking more closely, a connection (not shown) between the first receiving contact 2112 and the first transmitting contact 2113 of each first antenna 21 is not parallel to the first extension direction D1. In addition, the position of the first transmitting contact 2113 projected onto the first body 2111 is adjacent to one of the side edges (e.g., Figure 3 The first side E1 of the first receiving contact 2112 has a second shortest distance S2, and a position of the first receiving contact 2112 projected on the first body 2111 is adjacent to one of the side edges (for example: Figure 3 The third side E3) has a third shortest distance S3, and the second shortest distance S2 is greater than the third shortest distance S3.

[0070] Cooperate Figures 2 to 4 As shown, the two first microstrip lines 212 in this embodiment are arranged along the first extension direction D1, that is, the two first microstrip lines 212 are linear, but the present invention is not limited to this. For example, in other embodiments of the present invention not shown, the two first microstrip lines 212 may also be non-linear (e.g., C-shaped or S-shaped), that is, the two first microstrip lines 212 are not arranged along the first extension direction D1.

[0071] In addition, one of the first microstrip lines 212 is electrically coupled to the first receiving contact 2112 of the two first sub-antennas 211 and has a first receiving feed point 2121, and the other first microstrip line 212 is electrically coupled to the first transmitting contact 2113 of the two first sub-antennas 211 and has a first transmitting feed point 2122. In practice, the two first microstrip lines 212 can be connected to the first receiving feed point 2121 and the first transmitting feed point 2122 by coupling conduction. In addition, the first receiving feed point 2121 and the first transmitting feed point 2122 are connected to a grounding member of the substrate 1 (for example, the substrate 1 is connected to a grounding member 2121). Figure 4 lower side assembly in the ).

[0072] Re-parameter Figure 1 and Figure 5 As shown, one of the second sub-antennas 221 can overlap another second sub-antenna 221 when moving along the second extension direction D2, and each second sub-antenna 221 includes a second body 2211, a second receiving contact 2212, and a second transmitting contact 2213 disposed on the second body 2211. The configuration of the components of the two second sub-antennas 221 is substantially the same as that of the first sub-antenna 211. That is, in this embodiment, the second body 2211 has a hexagonal structure with six sides, and any two opposing sides are parallel to each other and have a first minimum distance S1 between them. The first minimum distance S1 is between 0.45 and 0.55 times the wavelength corresponding to a center frequency of the transmission frequency band.

[0073] Furthermore, a connection (not shown) between the second receiving contact 2212 and the second transmitting contact 2213 of each second antenna 22 is non-parallel to the second extension direction D2. In this embodiment, the second receiving contact 2212 and the second transmitting contact 2213 can each be a conductive via, and are disposed on the second body 2211 and spaced apart from each other. The second receiving contact 2212 and the second transmitting contact 2213 are electrically coupled to the feed module 3, with the second transmitting contact 2213 being used for transmission (i.e., TX) and the second receiving contact 2212 being used for reception (i.e., RX).

[0074] Of course, the position where the second transmission contact 2213 is projected on the second body 2211 and is adjacent to one of the side edges also has a second shortest distance S2, and the position where the second receiving contact 2212 is projected on the second body 2211 and is adjacent to one of the side edges also has a third shortest distance S3, and the second shortest distance S2 is preferably greater than the third shortest distance S3.

[0075] Furthermore, in this embodiment, the two second microstrip lines 222 are arranged along the second extension direction D2, that is, the two second microstrip lines 222 are linear, but the present invention is not limited thereto. One of the second microstrip lines 222 is electrically coupled to the second receiving contact points 2212 of the two second sub-antennas 221 and has a second receiving feed point 2221. The other second microstrip line 222 is electrically coupled to the second transmitting contact points 2213 of the two second sub-antennas 221 and has a second transmitting feed point 2222. The two second microstrip lines 222 can be connected to the second receiving feed point 2221 and the second transmitting feed point 2222 by coupling conduction.

[0076] It is worth noting that there is a center point C between the two first antennas 21 and the two second antennas 22, and one of the first sub-antennas 211 of each of the two first antennas 21 and one of the second sub-antennas 221 of each of the two second antennas 22 (i.e., the two first sub-antennas 211 and the two second sub-antennas 221) are adjacent to the center point C and are 90 degrees rotationally symmetrical about the center point C (e.g., Figure 2 shown).

[0077] In practice, the two first antennas 21 and the two second antennas 22 may also be rotationally symmetric at 90 degrees about the center point C. That is, in adjacent first antennas 21 and second antennas 22, the two first sub-antennas 211 also have a 90-degree rotational symmetry with the two second sub-antennas 221 through the center point C.

[0078] In other words, the two first antennas 21 and the two second antennas 22 have substantially the same structure and configuration. Furthermore, for any two adjacent first antennas 21 and second antennas 22, the components of the first antenna 21 can overlap the components of the second antenna 22 by rotating 90 degrees clockwise or counterclockwise about the center point C.

[0079] Re-parameter Figure 2 As shown, the feeding module 3 electrically couples the M antenna arrays 2 to generate the first circular polarization HCP 1 and the second circular polarization HCP 2 with opposite rotation directions. Figure 6 is a schematic diagram of the first circularly polarized HCP 1, Figure 7 Schematic diagram of the second circular polarization HCP2, where the dot density is proportional to the gain value.

[0080] In this embodiment, there is a 180-degree phase difference between the first receiving feed points 2121 of the two first antennas 21 and between the second receiving feed points 2221 of the two second antennas 22, and there is a 90-degree phase difference between each of the first receiving feed points 2121 and any of the second receiving feed points 2221. Furthermore, there is a 180-degree phase difference between the first transmitting feed points 2122 of the two first antennas 21 and between the second transmitting feed points 2222 of the two second antennas 22, and there is a 90-degree phase difference between each of the first transmitting feed points 2122 and any of the second transmitting feed points 2222.

[0081] The angle increasing direction of the two first receiving feed points 2121 and the two second receiving feed points 2221 is opposite to the angle increasing direction of the two first transmitting feed points 2122 and the two second transmitting feed points 2222. Accordingly, the two first receiving feed points 2121 and the two second receiving feed points 2221 can jointly generate the first circular polarization HCP1 through the feeding module 3, and the two first transmitting feed points 2122 and the two second transmitting feed points 2222 can jointly generate the second circular polarization HCP2 through the feeding module.

[0082] For example, when Figure 2 In (with Figure 3 and Figure 5 ) When the second receiving feed point 2221 of the second antenna 22 located above the paper and parallel to the second extension direction D2 is input with a signal of (1W, 0 degrees), for example, the second receiving feed point 2221 of the other second antenna 22 and the first receiving feed points 2121 of the two first antennas 21 are input with (1W, 90 degrees), (1W, 180 degrees), and (1W, -90 degrees) in a clockwise order. In other words, the phases input to the two first receiving feed points 2121 and the two second receiving feed points 2221 are increasing in a clockwise direction. Accordingly, the two first receiving feed points 2121 and the two second receiving feed points 2221 can jointly generate the first circularly polarized HCP 1 (such as right-handed) through the feeding module 3. Figure 6 shown).

[0083] On the contrary, when Figure 2 In (with Figure 3 and Figure 5) When the second transmission feed point 2222 of the second antenna 22 located above the paper and parallel to the second extension direction D2 is input with a signal of (1W, 0 degrees), for example, the second transmission feed point 2222 of the other second antenna 22 and the first transmission feed points 2122 of the two first antennas 21 are input with (1W, 90 degrees), (1W, 180 degrees), and (1W, -90 degrees) in a counter-clockwise order. In other words, the phases input to the two first transmission feed points 2122 and the two second transmission feed points 2222 are counter-clockwise increasing. Accordingly, the two first transmission feed points 2122 and the two second transmission feed points 2222 can jointly generate the second circularly polarized HCP2 (such as left-handed) through the feeding module 3. Figure 7 shown).

[0084] It should be noted that Figure 8 is the return loss (Return Loss) result actually measured at the first transmission feeding point 2122 or the second transmission feeding point 2222, Figure 9 is the return loss (Return Loss) result actually measured at the first receiving feed point 2121 or the second receiving feed point 2221. Figure 8 and Figure 9 The horizontal axis is frequency, the vertical axis is power, and each has a measured value line G1. The S ij of the value line L1 is (1,1). S ij means that the energy input from the i-th input port is measured at the j-th output port. Figure 8 and Figure 9 It can be seen that the power of the first transmission feed point 2122 or the second transmission feed point 2222 is less than -10 dB between 14 GHz and 14.5 GHz, while the power of the first reception feed point 2121 or the second reception feed point 2221 is less than -10 dB between 10.7 GHz and 12.7 GHz. In other words, the frequency range of the first transmission feed point 2122 or the second transmission feed point 2222 is preferably between 14 GHz and 14.5 GHz, while the frequency range of the first reception feed point 2121 or the second reception feed point 2221 is preferably between 10.7 GHz and 12.7 GHz.

[0085] In addition, it is worth noting that, in one embodiment, Figure 2As shown, the feeding module 3 can be M beamforming chips 31 connected to the M antenna arrays 2. Specifically, the feeding module includes M beamforming chips 31, and the M beamforming chips 31 are respectively arranged at the center point C of the M antenna arrays 2, and the M beamforming chips 31 are respectively electrically coupled to the two first receiving feed points 2121, the two second receiving feed points 2221, the two first transmitting feed points 2122, and the two second transmitting feed points 2222 of the M antenna arrays 2.

[0086] In another embodiment, if Figure 10 and Figure 11 As shown, the feeding module 3 may comprise N receiving chips 32 and N transmitting chips 33, each connected to M antenna arrays 2, where M is 2N and N is a positive integer not less than 1. Specifically, the N receiving chips 32 may be disposed on one side surface 11 of the substrate 1, and each receiving chip 32 may be disposed between any two adjacent antenna arrays 2 to electrically couple the first receiving feed points 2121 and the second receiving feed points 2221 of the two antenna arrays 2.

[0087] That is, in the two embodiments, each of the two antenna arrays 2 uses two beamforming chips 31, or one receiving chip 32 and one transmitting chip 33. Thus, the dual circularly polarized antenna structure 100 can effectively reduce chip usage, but the present invention is not limited thereto.

[0088] For example, in other embodiments not shown, the dual circularly polarized antenna structure 100 may include two substrates 1, wherein one substrate 1 is provided with N receiving chips 32 and M antenna arrays 2, and each receiving chip 32 is connected to each of the first receiving feed points 2121 and each of the second receiving feed points 2221 of two adjacent antenna arrays 2. The other substrate 1 is provided with N transmitting chips 33 and M antenna arrays 2, and each transmitting chip 33 is connected to each of the first transmitting feed points 2122 and each of the second transmitting feed points 2222 of two adjacent antenna arrays 2.

[0089] [Technical Effects of the Embodiments of the Invention]

[0090] In summary, the dual circularly polarized antenna structure disclosed in the embodiment of the present invention can reduce costs and reduce losses through the designs of "one of the first sub-antennas can overlap the other first sub-antenna when moving along the first extension direction, and one of the second sub-antennas can overlap the other second sub-antenna when moving along the second extension direction", and "one of the first sub-antennas of each of the two first antennas and one of the second sub-antennas of each of the two second antennas are adjacent to the center point and are rotationally symmetrical at 90 degrees about the center point".

[0091] The contents disclosed above are only preferred feasible embodiments of the present invention and do not limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the description and drawings of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A dual circularly polarized antenna structure, comprising: A substrate comprising a first extension direction and a second extension direction perpendicular to the first extension direction; M antenna arrays are arranged on the substrate, where M is a positive integer not less than 1. The M antenna arrays include: Two first antennas, each comprising: two first sub-antennas, arranged along the first extension direction and each comprising a first body, and a first receiving contact and a first transmitting contact disposed on the first body, wherein one of the first sub-antennas is capable of overlapping the other first sub-antenna when moving along the first extension direction; and two first microstrip lines, one of which is electrically coupled to the first receiving points of the two first sub-antennas and has a first receiving feed point, and the other of which is electrically coupled to the first transmitting points of the two first sub-antennas and has a first transmitting feed point; and Two second antennas, each containing: two second sub-antennas, arranged along the second extension direction and each comprising a second body, and a second receiving contact and a second transmitting contact disposed on the second body, wherein one of the second sub-antennas is capable of overlapping the other second sub-antenna when moving along the second extension direction; and two second microstrip lines, one of which is electrically coupled to the second receiving points of the two second sub-antennas and has a second receiving feed point, and the other is electrically coupled to the second transmitting points of the two second sub-antennas and has a second transmitting feed point; There is a center point between the two first antennas and the two second antennas, and one of the first sub-antennas of each of the two first antennas and one of the second sub-antennas of each of the two second antennas are adjacent to the center point and are rotationally symmetrical at 90 degrees about the center point; as well as A feeding module is electrically coupled to each of the M antenna arrays to generate a first circular polarization and a second circular polarization with opposite rotation directions.

2. The dual circular polarization antenna structure according to claim 1, characterized in that: There is a 180-degree phase difference between the first receiving feed points of the two first antennas and between the second receiving feed points of the two second antennas, and there is a 90-degree phase difference between each of the first receiving feed points and any one of the second receiving feed points; there is a 180-degree phase difference between the first transmitting feed points of the two first antennas and between the second transmitting feed points of the two second antennas, and there is a 90-degree phase difference between each of the first transmitting feed points and any one of the second transmitting feed points.

3. The dual circularly polarized antenna structure according to claim 2, characterized in that: The two first receiving feed points and the two second receiving feed points can jointly generate the first circular polarization through the feeding module, and the two first transmitting feed points and the two second transmitting feed points can jointly generate the second circular polarization through the feeding module.

4. The dual circularly polarized antenna structure according to claim 1, wherein: The feed module further includes N receiving chips and N transmitting chips, where M is 2N and N is a positive integer not less than 1; each receiving chip is arranged between any two adjacent antenna arrays to electrically couple each first receiving feed point and each second receiving feed point of the two antenna arrays; each transmitting chip is arranged between any two adjacent antenna arrays to electrically couple each first transmitting feed point and each second transmitting feed point of the two antenna arrays.

5. The dual circular polarization antenna structure according to claim 1, wherein: The feeding module includes M beamforming chips; the M beamforming chips are respectively arranged at the center points of the M antenna arrays, and the M beamforming chips are respectively electrically coupled to the two first receiving feed points, two second receiving feed points, two first transmitting feed points, and two second transmitting feed points of the M antenna arrays.

6. The dual circular polarization antenna structure according to claim 1, characterized in that: The dual circularly polarized antenna structure is suitable for a transmission frequency band; the first bodies of the two first antennas and the second bodies of the two second antennas are respectively hexagonal, having six sides; among the six sides, any two of the sides located opposite to each other are parallel to each other and have a first shortest distance, and the first shortest distance is between 0.45 and 0.55 times the wavelength corresponding to a center frequency of the transmission frequency band.

7. The dual circularly polarized antenna structure according to claim 6, characterized in that: A position where the first transmission feed point is projected onto the first body is adjacent to one of the side edges and has a second shortest distance. A position where the first reception feed point is projected onto the first body is adjacent to one of the side edges and has a third shortest distance. The second shortest distance is smaller than the third shortest distance.

8. The dual circular polarization antenna structure according to claim 6, characterized in that: The position where the second transmission feed point is projected onto the second body is adjacent to one of the side edges and has a second shortest distance. The position where the second reception feed point is projected onto the second body is adjacent to one of the side edges and has a third shortest distance. The second shortest distance is smaller than the third shortest distance.

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