Dual-polarized antenna for cubesat

Abstract

The utility model provides a dual polarized antenna used for a cubesat, comprising a first substrate, the lower side of the first substrate is provided with two feed networks, each feed network comprises a plurality of first feed points and a signal receiving point, and the signal receiving point is used for receiving signals output by the cubesat; the second substrate is arranged above the first substrate; a plurality of groups of coaxial lines, wherein one end of each group of coaxial lines is electrically connected with each first feeding point; the two antenna groups are arranged on the second substrate, each antenna group is provided with a plurality of second feeding points, and each second feeding point is configured to be electrically connected with the other end of each group of coaxial lines penetrating through the second substrate and the first substrate; the two antenna groups are used for radiating signals output by the cubesat in a left-hand circular polarization mode and a right-hand circular polarization mode respectively.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas and communications, and more specifically, to a dual-polarization antenna for a cubic satellite. Background Art

[0002] With the development of aerospace technology, the research and development of micro-spacecraft has broad development prospects, and the development of cubic satellites has emerged. Due to the size of existing cubic satellites, the antenna size should not be too large, so the existing cubic satellites basically use a single antenna structure. The small size of a single antenna is easier to integrate into the surface of a cubic satellite, especially for smaller satellites, but the transmission rate and bit error rate of a single antenna are limited. Although multi-antenna structures have been widely used in ground systems, they are not common on cubic satellites. This is because the antenna for satellite-to-ground communication must not only be small enough to be easy to integrate, but also provide high gain, and the larger size of multiple antennas will occupy more space resources of the cubic satellite. Therefore, designing a multi-antenna with a small size and high gain is an important research direction. Utility Model Content

[0003] In view of this, in order to solve at least one of the technical problems in the prior art, an embodiment of the utility model provides a dual-polarization antenna for a cubic satellite, which improves the gain of the dual-polarization antenna to meet the needs of satellite-to-ground communication.

[0004] An embodiment of the utility model provides a dual-polarized antenna for a cubic satellite, comprising: a first substrate, on the lower side of which are arranged: two feeding networks, each of which includes a plurality of first feeding points and a signal receiving point, and the signal receiving point is used to receive signals output by the cubic satellite; a second substrate, arranged above the first substrate; a plurality of groups of coaxial lines, one end of each group of the coaxial lines is electrically connected to each of the first feeding points; two antenna groups, arranged on the second substrate, each of which is provided with a plurality of second feeding points, each of which is configured to be electrically connected to the other end of each group of the coaxial lines passing through the second substrate and the first substrate, and the two antenna groups are used to radiate the signals output by the cubic satellite in left-hand circular polarization and right-hand circular polarization, respectively.

[0005] Optionally, the dual-polarized antenna for a CubeSat further includes a ground layer disposed between the first substrate and the second substrate, wherein the ground layer is used to reflect the signal to prevent the signal from being radiated to below the first substrate.

[0006] Optionally, the two antenna groups are symmetrically arranged on the second substrate, and each antenna group includes: four radiation units, which are respectively arranged on four vertices of a square, and two of the radiation units located at relative positions are located on vertices opposite to the diagonal of the square, the four radiation units belonging to one antenna group radiate in the above-mentioned left-hand circular polarization manner, and the four radiation units belonging to the other antenna group radiate in the above-mentioned right-hand circular polarization manner.

[0007] Optionally, among the four radiating units belonging to one of the above-mentioned antenna groups, a line connecting the second feeding point set on each of the above-mentioned radiating units and the geometric center of the above-mentioned radiating unit is rotated in a clockwise direction to determine the position of the second feeding point on the above-mentioned radiating units arranged adjacently in the transverse direction or the longitudinal direction; among the four radiating units belonging to another of the above-mentioned antenna groups, a line connecting the second feeding point set on each of the above-mentioned radiating units and the geometric center of the above-mentioned radiating unit is rotated in a counterclockwise direction to determine the position of the second feeding point on the above-mentioned radiating units arranged adjacently in the transverse direction or the longitudinal direction.

[0008] Optionally, the phase difference between the second feeding points on two of the radiation units that belong to the same antenna group and are adjacently arranged in the transverse direction and the longitudinal direction is 90°.

[0009] Optionally, branches protrude from each of the radiation units toward both sides in a radial direction, so as to adjust the impedance and bandwidth between two of the radiation units adjacently arranged in the transverse direction and the longitudinal direction.

[0010] Optionally, each of the above-mentioned feeding networks includes: a first power divider, on which the above-mentioned signal receiving point is arranged, and the above-mentioned first power divider is used to equally divide the power of the signal output by the above-mentioned cube satellite; a second power divider, one end of the above-mentioned second power divider is configured to be electrically connected to one end of the above-mentioned first power divider, and the other end of the above-mentioned second power divider is provided with two above-mentioned first feeding points, so as to feed the two above-mentioned radiation units in the same above-mentioned antenna group through the two groups of the above-mentioned coaxial lines respectively; a third power divider, one end of the above-mentioned third power divider is configured to be electrically connected to the other end of the above-mentioned first power divider, and the other end of the above-mentioned third power divider is provided with two above-mentioned first feeding points, so as to feed the other two above-mentioned radiation units in the same above-mentioned antenna group through the two groups of the above-mentioned coaxial lines respectively.

[0011] Optionally, the two above-mentioned feeding networks feed the two above-mentioned antenna groups respectively, and the four above-mentioned first feeding points belonging to one of the above-mentioned feeding networks feed the four above-mentioned radiating units belonging to one of the above-mentioned antenna groups through the four groups of the above-mentioned coaxial lines respectively, based on the phase difference that changes along the clockwise direction, so as to achieve the above-mentioned right-hand circular polarization; the four above-mentioned first feeding points belonging to another above-mentioned feeding network feed the four above-mentioned radiating units belonging to another above-mentioned antenna group through the four groups of the above-mentioned coaxial lines respectively, based on the phase difference that changes along the counterclockwise direction, so as to achieve the above-mentioned left-hand circular polarization.

[0012] Optionally, a stepped groove is provided on one side of the second substrate to facilitate connection with the cubic satellite.

[0013] According to a dual-polarized antenna for a cubic satellite in an embodiment of the utility model, two feeding networks are arranged on the lower side of the first substrate, each feeding network includes multiple first feeding points and a signal receiving point, the signal receiving point is used to receive the signal output by the cubic satellite, the second substrate is arranged above the first substrate, one end of each group of coaxial lines is electrically connected to each first feeding point, two antenna groups are arranged on the second substrate, each antenna group is provided with multiple second feeding points, each second feeding point is configured to be electrically connected to the other end of each group of coaxial lines passing through the second substrate and the first substrate, the two antenna groups are used to radiate the signal output by the cubic satellite in left-hand circular polarization and right-hand circular polarization respectively, thereby improving the gain of the dual-polarized antenna to meet the needs of satellite-to-ground communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings.

[0015] Figure 1 The figure is an exploded view of a dual-polarized antenna for a cubic satellite according to an embodiment of the utility model.

[0016] Figure 2 It is a cross-sectional view of a dual-polarization antenna for a cubic satellite according to an embodiment of the utility model.

[0017] Figure 3 The figure is a top view of a dual-polarized antenna for a cubic satellite according to an embodiment of the utility model.

[0018] Figure 4 It is a cross-sectional view of a first substrate and two feeding networks according to an embodiment of the utility model.

[0019] Figure 5 It is an S-parameter curve diagram of a dual-polarized antenna at a frequency of 2.3 GHz to 2.6 GHz according to an embodiment of the utility model.

[0020] Figure 6 It is an axial ratio curve diagram of a dual-polarized antenna at a frequency of 2.45 GHz according to an embodiment of the utility model.

[0021] Figure 7 It is a diversity gain curve diagram of a dual-polarized antenna at a frequency of 2.3 GHz to 2.6 GHz according to an embodiment of the utility model.

[0022] Figure 8 It is a graph of relevant envelope coefficients of a dual-polarized antenna at a frequency of 2.3 GHz to 2.6 GHz according to an embodiment of the utility model.

[0023] Fig. 9 According to an embodiment of the present invention, the first antenna group is at a frequency of 2.45 GHz. =0° / 90° gain and directivity pattern.

[0024] Fig.10 The second antenna group according to an embodiment of the utility model is at a frequency of 2.45 GHz. =0° / 90° gain and directivity pattern.

[0025] In the drawings, the meanings of the reference numerals are as follows:

[0026] 1. a first substrate;

[0027] 2. Feeding network;

[0028] 21. First feeding point;

[0029] 22. Signal receiving point;

[0030] 23. The first power divider;

[0031] 24. The second power divider;

[0032] 25. The third power divider;

[0033] 3. A second substrate;

[0034] 4. Coaxial cable;

[0035] 5. The first antenna group;

[0036] 51. Radiation unit;

[0037] 52. Second feeding point;

[0038] 53. Branches;

[0039] 54. Step trough;

[0040] 6. Second antenna group;

[0041] 7. Ground layer. DETAILED DESCRIPTION

[0042] 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 present invention. In the following detailed description, for ease of explanation, many specific details are described to provide a comprehensive understanding of the embodiments of the present invention. However, it is obvious that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0043] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "include", "comprises", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0044] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0045] In the case of using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.). In the case of using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, or C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0046] In order to improve the gain, according to the concept of one aspect of the utility model, two feeding networks are arranged on the lower side of the first substrate, each feeding network includes multiple first feeding points and a signal receiving point, the signal receiving point is used to receive the signal output by the cube satellite, the second substrate is arranged above the first substrate, one end of each group of coaxial lines is electrically connected to each first feeding point, two antenna groups are arranged on the second substrate, each antenna group is provided with multiple second feeding points, each second feeding point is configured to be electrically connected to the other end of each group of coaxial lines passing through the second substrate and the first substrate, and the two antenna groups are used to radiate the signal output by the cube satellite in left-hand circular polarization and right-hand circular polarization respectively, thereby improving the gain of the dual-polarization antenna to meet the needs of satellite-to-ground communication.

[0047] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0048] Figure 1 is an exploded view of a dual-polarized antenna for a cubic satellite according to an embodiment of the utility model. Figure 2 It is a cross-sectional view of a dual-polarization antenna for a cubic satellite according to an embodiment of the utility model.

[0049] According to the embodiments of the present utility model, Figure 1 and Figure 2 As shown, a dual-polarized antenna for a cubic satellite is provided, including a first substrate 1, a second substrate 3, a plurality of coaxial lines 4 and two antenna groups. Two feeding networks 2 are arranged on the lower side of the first substrate 1, each feeding network 2 includes a plurality of first feeding points 21 and a signal receiving point 22, and the signal receiving point 22 is used to receive the signal output by the cubic satellite. The second substrate 3 is arranged above the first substrate 1. One end of each group of coaxial lines 4 is electrically connected to each first feeding point 21. Two antenna groups are arranged on the second substrate 3, each antenna group is provided with a plurality of second feeding points 52, each second feeding point 52 is configured to be electrically connected to the other end of each group of coaxial lines 4 passing through the second substrate 3 and the first substrate 1, and the two antenna groups are used to radiate the signal output by the cubic satellite in left-hand circular polarization and right-hand circular polarization, respectively.

[0050] According to the embodiment of the utility model, the overall length of the dual-polarized antenna is 200 mm, the width is 100 mm, and the thickness does not exceed 3 mm. It is suitable for the S-band and is applied to 3U or above cubic satellites.

[0051] According to the embodiment of the present invention, the material of the feed network 2 can be selected from metal, for example, copper, with a thickness of 35 m.

[0052] According to an embodiment of the present invention, the material of the first substrate 1 can be Rogers 4350, with a thickness of 0.762 mm and a dielectric constant between 3.4 and 3.6. The first substrate 1 can fix and support two feeding networks 2 .

[0053] According to the embodiment of the utility model, the material of the second substrate 3 can be Rogers 6006, with a thickness of 1.524 mm and a dielectric constant between 6.1 and 6.2. The second substrate 3 is laminated with the first substrate 1, and the second substrate 3 can fix and support the two antenna groups. At the same time, the larger dielectric constant can reduce the size of the second substrate 3.

[0054] According to an embodiment of the present invention, the material of each group of coaxial lines 4 may be metal, for example, copper.

[0055] According to the embodiment of the utility model, two feed networks 2 are arranged on the lower side of the first substrate 1, each feed network 2 includes a plurality of first feed points 21 and a signal receiving point 22, the signal receiving point 22 is used to receive the signal output by the cubic satellite, the second substrate 3 is arranged above the first substrate 1, one end of each group of coaxial lines 4 is electrically connected to each first feed point 21, two antenna groups are arranged on the second substrate 3, each antenna group is provided with a plurality of second feed points 52, each second feed point 52 is configured to be electrically connected to the other end of each group of coaxial lines 4 passing through the second substrate 3 and the first substrate 1, and the two antenna groups are used to radiate the signal output by the cubic satellite in the form of left-hand circular polarization and right-hand circular polarization, respectively, thereby improving the gain of the dual-polarized antenna to meet the needs of satellite-to-ground communication. The two layers of substrates are stacked, the structure is simple and compact, the space occupied is small, the weight is light, and the processing is easy, and it is suitable for integration on the surface of the cubic satellite or the solar panels of the cubic satellite.

[0056] According to an embodiment of the utility model, the dual-polarized antenna for a cubic satellite further includes a ground layer 7 , which is disposed between the first substrate 1 and the second substrate 3 . The ground layer 7 is used to reflect signals to prevent the signals from being radiated to the bottom of the first substrate 1 .

[0057] According to the embodiment of the present invention, the material of the grounding layer 7 can be metal, for example, copper, with a thickness of 35 m.

[0058] According to the embodiment of the utility model, by providing a ground layer 7 between the first substrate 1 and the second substrate 3 , the ground layer 7 can reflect signals to prevent the signals from being radiated to the bottom of the first substrate 1 , thereby improving the performance of the dual-polarized antenna.

[0059] Figure 3 The figure is a top view of a dual-polarized antenna for a cubic satellite according to an embodiment of the utility model.

[0060] According to the embodiments of the present utility model, Figure 3 As shown, two antenna groups are symmetrically arranged on the second substrate 3, and each antenna group includes four radiating units 51. The four radiating units 51 are respectively arranged on four vertices of a square, and two radiating units 51 located at opposite positions are located at vertices opposite to the diagonal of the square. The four radiating units 51 belonging to one antenna group radiate in a left-handed circular polarization manner, and the four radiating units 51 belonging to the other antenna group radiate in a right-handed circular polarization manner.

[0061] According to an embodiment of the present invention, the radiation unit 51 can be in the form of a patch, the radius of each radiation unit 51 is 13.64 mm, and the material of each radiation unit 51 can be metal, such as copper, with a thickness of 35 mm. m.

[0062] According to an embodiment of the utility model, the two antenna groups include a first antenna group 5 and a second antenna group 6. The first antenna group 5 and the second antenna group 6 are symmetrically arranged on the second substrate 3. The four radiation units 51 of the first antenna group 5 radiate in a left-handed circular polarization manner, and the four radiation units 51 of the second antenna group 6 radiate in a right-handed circular polarization manner.

[0063] According to an embodiment of the utility model, among the four radiating elements 51 belonging to one antenna group, the line connecting the second feeding point 52 provided on each radiating element 51 and the geometric center of the radiating element 51 is rotated in a clockwise direction to determine the position of the second feeding point 52 on the radiating element 51 adjacently arranged in the transverse direction or the longitudinal direction. Among the four radiating elements 51 belonging to another antenna group, the line connecting the second feeding point 52 provided on each radiating element 51 and the geometric center of the radiating element 51 is rotated in a counterclockwise direction to determine the position of the second feeding point 52 on the radiating element 51 adjacently arranged in the transverse direction or the longitudinal direction.

[0064] According to an embodiment of the present invention, the phase difference between the second feeding points 52 on two radiating units 51 that belong to the same antenna group and are adjacently arranged in the transverse direction and the longitudinal direction is 90°.

[0065] In an illustrative embodiment, the phase of the second feeding point 52 on the radiating element 51 at the lower right corner of the first antenna group 5 is 0°, the phase of the second feeding point 52 on the radiating element 51 at the upper right corner of the first antenna group 5 is 90°, the phase of the second feeding point 52 on the radiating element 51 at the upper left corner of the first antenna group 5 is 180°, and the phase of the second feeding point 52 on the radiating element 51 at the lower left corner of the first antenna group 5 is 270°. The phase of the second feeding point 52 on the radiating element 51 at the lower left corner of the second antenna group 6 is 0°, the phase of the second feeding point 52 on the radiating element 51 at the upper left corner of the second antenna group 6 is 90°, the phase of the second feeding point 52 on the radiating element 51 at the upper right corner of the second antenna group 6 is 180°, and the phase of the second feeding point 52 on the radiating element 51 at the lower right corner of the second antenna group 6 is 270°.

[0066] According to an embodiment of the utility model, the phase of the second feeding point 52 on the four radiating units 51 of the first antenna group 5 rotates in a counterclockwise direction, and the phase of the second feeding point 52 on the four radiating units 51 of the second antenna group 6 rotates in a clockwise direction. The radiation effects of the four radiating units 51 located in the same antenna group are superimposed, thereby improving the gain of the dual-polarized antenna, and the signals are isolated between the radiating units 51 located in different antenna groups, which is beneficial to cubic satellite-to-ground communication.

[0067] According to an embodiment of the present invention, branches 53 protrude from each radiation unit 51 toward both sides along the radial direction, so as to adjust the impedance and bandwidth between two radiation units 51 adjacently arranged in the transverse direction and the longitudinal direction.

[0068] According to an embodiment of the utility model, each radiation unit 51 has branches 53 of the same size protruding on both sides along the radial direction. The shape of the branches 53 can be rectangular. By extending the current path to expand the bandwidth, the impedance between two radiation units 51 arranged adjacent to each other in the lateral and longitudinal directions is improved.

[0069] Figure 4 It is a cross-sectional view of a first substrate and two feeding networks according to an embodiment of the utility model.

[0070] According to the embodiments of the present utility model, Figure 4As shown, each feeding network 2 includes a first power divider, a second power divider and a third power divider. A signal receiving point 22 is provided on the first power divider, and the first power divider is used to equally divide the power of the signal output by the cube satellite. One end of the second power divider is configured to be electrically connected to one end of the first power divider, and the other end of the second power divider is provided with two first feeding points 21, so as to feed two radiating units 51 in the same antenna group through two groups of coaxial lines 4 respectively. One end of the third power divider is configured to be electrically connected to the other end of the first power divider, and the other end of the third power divider is provided with two first feeding points 21, so as to feed the other two radiating units 51 in the same antenna group through two groups of coaxial lines 4 respectively.

[0071] According to an embodiment of the utility model, the first power divider, the second power divider and the third power divider can select Wilkinson power dividers, and the input impedance is 50.5Ω. One end of the second power divider is configured to be electrically connected to one end of the first power divider, and the second power divider is used to divide the signal output by the cube satellite that has been divided by the first power divider into equal parts again. One end of the third power divider is configured to be electrically connected to the other end of the first power divider, and the third power divider is used to divide the signal output by the cube satellite that has been divided by the first power divider into equal parts again.

[0072] According to an embodiment of the present invention, the sizes of the various sites in the first power divider, the second power divider and the third power divider are shown in Table 1 below. The sites 22a, 22b, 22c, 22d, 22e, 22f, 22g, 25a, 25b, 25c, 25d, 25e, 25f, 25g, 25h, 25i, 24a, 24b, 24c, 26a, 26b, 26c, 28a, 28b, 28c, 28d, 27a, 27b, 27c, 27d and 27e in Table 1 correspond to Figure 4 The figure marks 22a, 22b, 22c, 22d, 22e, 22f, 22g, 25a, 25b, 25c, 25d, 25e, 25f, 25g, 25h, 25i, 24a, 24b, 24c, 26a, 26b, 26c, 28a, 28b, 28c, 28d, 27a, 27b, 27c, 27d and 27e.

[0073] Table 1 Dimensions of each point in the first power divider, the second power divider and the third power divider

[0074]

[0075] According to the embodiment of the utility model, each 90° corner in the first power divider, the second power divider and the third power divider is chamfered by 45°, which reduces the reflection coefficient, and the three power dividers generate different phase differences through different lengths.

[0076] According to an embodiment of the utility model, two feeding networks 2 feed two antenna groups respectively, and four first feeding points 21 belonging to one feeding network feed four radiating elements 51 belonging to one antenna group respectively through four groups of coaxial lines 4, based on the phase difference that rotates in the clockwise direction, to achieve right-hand circular polarization. Four first feeding points 21 belonging to another feeding network feed four radiating elements 51 belonging to another antenna group respectively through four groups of coaxial lines 4, based on the phase difference that rotates in the counterclockwise direction, to achieve left-hand circular polarization.

[0077] According to an embodiment of the utility model, the two feeding networks include a first feeding network and a second feeding network, the first feeding network feeds the first antenna group 5, and the second feeding network feeds the second antenna group 6. The first power divider 23 of the first feeding network equally divides the power of the signal output by the cube satellite, the two first feeding points 21 on the second power divider 24 of the first feeding network respectively feed the two radiating elements 51 in the first antenna group 5 through the two groups of coaxial lines 4, and the two first feeding points 21 on the third power divider 25 of the first feeding network respectively feed the other two radiating elements 51 in the first antenna group 5 through the two groups of coaxial lines 4, and the different phase differences when reaching each radiating element 51 through the first feeding network are achieved to realize left-hand circular polarization. The first power divider 23 of the second feeding network equally divides the power of the signal output by the cube satellite, and the two first feeding points 21 on the second power divider 24 of the second feeding network respectively feed the two radiating elements 51 in the second antenna group 6 through two groups of coaxial lines 4, and the two first feeding points 21 on the third power divider 25 of the second feeding network respectively feed the other two radiating elements 51 in the second antenna group 6 through two groups of coaxial lines 4, and the different phase differences when reaching each radiating element 51 through the second feeding network are realized to realize right-hand circular polarization. The dual-polarized antenna is a multiple input multiple output (MIMO) antenna as a whole.

[0078] According to an embodiment of the present utility model, a stepped groove 54 is provided on one side of the second substrate 3 to facilitate connection with a cubic satellite.

[0079] According to the embodiment of the present invention, the stepped groove 54 has a length of 10 mm and a width of 5 mm, so as to facilitate connection with a connector such as SMA, and further, to facilitate connection with a cubic satellite.

[0080] Figure 5 It is an S-parameter curve diagram of a dual-polarized antenna at a frequency of 2.3 GHz to 2.6 GHz according to an embodiment of the utility model.

[0081] According to the embodiments of the present utility model, Figure 5As shown, the S11 parameter represents the voltage reflection coefficient of the first antenna group 5, the S22 parameter represents the voltage reflection coefficient of the second antenna group 6, the S12 parameter represents the voltage transmission coefficient from the second antenna group 6 to the first antenna group 5, and the S21 parameter represents the voltage transmission coefficient from the first antenna group 5 to the second antenna group 6. The S12 parameter and the S21 parameter are shown in FIG. Figure 5 overlap in the graph, so the curve of the S21 parameter is Figure 5 The S11 and S22 parameters are both less than -10 dB in the 2.42 GHz ~ 2.58 GHz band, and the dual-polarized antenna has a wide bandwidth to meet the needs of satellite-to-ground communications.

[0082] Figure 6 It is an axial ratio curve diagram of a dual-polarized antenna at a frequency of 2.45 GHz according to an embodiment of the utility model.

[0083] According to the embodiments of the present utility model, Figure 6 As shown, the axial ratio is less than 3dB in a large range. It can be seen that the circular polarization performance of the dual-polarized antenna is good.

[0084] Figure 7 This is a diversity gain curve diagram of a dual-polarized antenna at a frequency of 2.3 GHz to 2.6 GHz according to an embodiment of the utility model. Figure 8 It is a graph of relevant envelope coefficients of a dual-polarized antenna at a frequency of 2.3 GHz to 2.6 GHz according to an embodiment of the utility model.

[0085] According to the embodiments of the present utility model, Figure 7 and Figure 8 As shown, the diversity gain between the first antenna group 5 and the second antenna group 6 is close to 10 dB (maximum 10 dB), and the relevant envelope coefficient is small (less than 10 in the frequency band). -4 ), which reflects that the isolation between the first antenna group 5 and the second antenna group 6 is good.

[0086] Fig. 9 According to an embodiment of the present invention, the first antenna group is at a frequency of 2.45 GHz. =0° / 90° gain and directivity pattern, Fig.10 The second antenna group according to an embodiment of the utility model is at a frequency of 2.45 GHz. =0° / 90° gain and directivity pattern.

[0087] According to the embodiments of the present utility model, Fig. 9 and Fig.10 As shown, it can be seen that the maximum gain of the first antenna group 5 and the second antenna group 6 are both approximately 8.8 dBi, the 3dB beam width is 53°, the energy is relatively concentrated, the gain is relatively high, and the requirements of satellite-to-ground communication can be met.

[0088] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present invention. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted when they may cause confusion in the understanding of the present invention, and the shapes and sizes of the components in the drawings do not reflect the actual size and proportion, but only illustrate the contents of the embodiments of the present invention.

[0089] Unless otherwise indicated, the numerical parameters in this specification and the attached examples are approximate values ​​and can be changed according to the desired characteristics obtained by the content of the utility model. Specifically, all the numbers used in the specification and the examples to express the content of the composition, reaction conditions, etc., should be understood to be modified by the term "about" in all cases. In general, the meaning of the expression refers to the change of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments by a specific number.

[0090] The ordinal numbers used in the specification and the embodiments, such as "first", "second", "third", etc., to modify the corresponding elements, do not themselves mean that the elements have any ordinal numbers, nor do they represent the order of one element and another element, or the order in the manufacturing method. The use of these ordinal numbers is only used to clearly distinguish a component with a certain name from another component with the same name.

[0091] In addition, unless the steps are specifically described or must occur in sequence, the order of the above steps is not limited to the above list, and can be changed or rearranged according to the required design. And the above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

[0092] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is 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 in the protection scope of the present invention.

Claims

1. A dual-polarized antenna for a CubeSat, characterized in that: include: A first substrate, wherein the lower side of the first substrate is provided with: Two feeding networks, each of which includes a plurality of first feeding points and a signal receiving point, and the signal receiving point is used to receive a signal output by a cubic satellite; A second substrate, disposed above the first substrate; A plurality of groups of coaxial lines, one end of each group of the coaxial lines being electrically connected to each of the first feeding points; Two antenna groups are arranged on the second substrate, each of the antenna groups is provided with a plurality of second feeding points, each of the second feeding points is configured to be electrically connected to the other end of each group of the coaxial lines passing through the second substrate and the first substrate, and the two antenna groups are used to radiate the signals output by the cubesat in left-hand circular polarization and right-hand circular polarization, respectively.

2. The dual-polarized antenna according to claim 1, characterized in that: Also includes: A grounding layer is disposed between the first substrate and the second substrate, and is used for reflecting the signal to prevent the signal from being radiated to the bottom of the first substrate.

3. The dual-polarized antenna according to claim 1, characterized in that: The two antenna groups are symmetrically arranged on the second substrate, and each antenna group includes: Four radiating units are respectively arranged on four vertices of a square, and two of the radiating units located at opposite positions are located at vertices opposite to the diagonal of the square. The four radiating units belonging to one antenna group radiate in the left-hand circular polarization manner, and the four radiating units belonging to another antenna group radiate in the right-hand circular polarization manner.

4. The dual-polarized antenna according to claim 3, characterized in that: Among the four radiating elements belonging to one antenna group, a line connecting the second feeding point set on each radiating element and the geometric center of the radiating element is rotated in a clockwise direction to determine the position of the second feeding point on the radiating element adjacently arranged in the transverse direction or the longitudinal direction; Among the four radiating units belonging to another antenna group, the line connecting the second feeding point set on each radiating unit and the geometric center of the radiating unit is rotated counterclockwise to determine the position of the second feeding point on the radiating unit arranged adjacently in the transverse direction or the longitudinal direction.

5. The dual-polarized antenna according to claim 4, characterized in that: The phase difference between the second feeding points on two radiating units belonging to the same antenna group and arranged adjacently in the transverse direction and the longitudinal direction is 90°.

6. The dual-polarized antenna according to claim 5, characterized in that: Each of the radiation units has branches protruding toward both sides along the radial direction, so as to adjust the impedance and bandwidth between two radiation units arranged adjacent to each other in the transverse direction and the longitudinal direction.

7. The dual-polarized antenna according to claim 5, characterized in that: Each of the feed networks comprises: a first power divider, the signal receiving point being arranged on the first power divider, and the first power divider being used to equally divide the power of the signal output by the cubesat; A second power divider, wherein one end of the second power divider is configured to be electrically connected to one end of the first power divider, and the other end of the second power divider is provided with two first feeding points, so as to feed the two radiation units in the same antenna group through two groups of coaxial lines respectively; A third power divider, one end of the third power divider is configured to be electrically connected to the other end of the first power divider, and the other end of the third power divider is provided with two first feeding points to feed the other two radiating units in the same antenna group through two groups of coaxial lines respectively.

8. The dual-polarized antenna according to claim 7, characterized in that: The two feeding networks feed the two antenna groups respectively, and the four first feeding points belonging to one feeding network feed the four radiating elements in one antenna group respectively through four groups of coaxial lines based on the phase difference that changes in a clockwise rotation, so as to realize the right-hand circular polarization; The four first feeding points belonging to another feeding network respectively feed the four radiating elements in another antenna group through four groups of coaxial lines based on the phase difference that changes in a counterclockwise direction to achieve left-hand circular polarization.

9. The dual-polarized antenna according to claim 1, characterized in that: A stepped groove is provided on one side of the second substrate to facilitate connection with the cubic satellite.

Images