A satellite-borne ceramic antenna

Abstract

The present invention discloses a satellite-borne ceramic antenna, comprising a first ceramic feeder, a second ceramic feeder, a feed network board and a shell, wherein the first ceramic feeder is arranged above the second ceramic feeder, the feed network board is arranged below the second ceramic feeder, and the feed network board is electrically connected to the first ceramic feeder and the second ceramic feeder respectively, the feed network board is also externally connected to a feed connector, and the first ceramic feeder, the second ceramic feeder and the feed network board are placed in the shell. The satellite-borne ceramic antenna has the characteristics of miniaturization and high gain, and has low cost, and has high conductivity and feed reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of antennas, and in particular relates to a satellite-borne ceramic antenna. Background Art

[0002] In satellite low-frequency band communications, achieving antenna miniaturization, broadband and high gain is a technical problem that technicians in this field need to solve. In addition, when the antenna is applied to a satellite, it is also necessary to consider that the antenna has a large beam coverage. Summary of the invention

[0003] The main technical problem solved by the present invention is to provide a satellite-borne ceramic antenna, which solves the problems of miniaturization, high gain and wide coverage beam of satellite-borne satellite antennas in the prior art.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is to provide a satellite-borne ceramic antenna, including a first ceramic feeder as a transmitting antenna, a second ceramic feeder as a receiving antenna, a feed network board and a shell, wherein the first ceramic feeder is arranged above the second ceramic feeder, the feed network board is arranged below the second ceramic feeder, and the feed network board is electrically connected to the first ceramic feeder and the second ceramic feeder respectively, the feed network board is also externally connected to a feed connector, and the first ceramic feeder, the second ceramic feeder and the feed network board are placed in the shell.

[0005] Preferably, the first ceramic feeder includes a first ceramic part and a first radiation patch, the first radiation patch is attached to the upper surface of the first ceramic part, and the second ceramic feeder includes a second ceramic part and a second radiation patch, the second radiation patch is attached to the upper surface of the second ceramic part.

[0006] Preferably, the first radiation patch is electrically connected to the feed network board through a first probe, and the first probe passes through the first ceramic feeder and the second ceramic feeder; the second radiation patch is electrically connected to the feed network board through a second probe, and the second probe passes through the second ceramic feeder.

[0007] Preferably, the feeding network board includes a power division board, on which a ceramic bridge is arranged, and the ceramic bridge includes a first ceramic bridge and a second ceramic bridge, the first ceramic bridge is electrically connected to the first probe and then electrically connected to the first radiation patch, the second ceramic bridge is electrically connected to the second probe and then electrically connected to the second radiation patch, and the first ceramic bridge and the second ceramic bridge are both provided with a connection end electrically connected to the feeding connector.

[0008] Preferably, the first radiation patch and the second radiation patch are respectively provided with tuning branches for adjusting the transmitting frequency and the receiving frequency of the satellite-borne ceramic antenna.

[0009] Preferably, the first radiation patch and the second radiation patch are both circular, and the tuning branches are rectangular protrusions arranged on the circular outer edges of the first radiation patch and the second radiation patch, and there are four rectangular protrusions in total, which are evenly distributed along the circular outer edges of the first radiation patch and the second radiation patch.

[0010] Preferably, each tuning branch of the second radiation patch is further radially provided with a connecting portion, and the connecting portion is vertically connected to an arc-shaped portion of a circumferentially arranged arc-shaped structure, and the connecting portion and the arc-shaped portion are both ceramic surface areas exposed after cutting the second radiation patch, and the connecting portion is arranged in the middle of the arc-shaped portion, and the arc-shaped portion extends in two directions along the circumferential direction; the circumferential width of the connecting portion is smaller than the circumferential width of the rectangular protrusion of the tuning branch, and is located in the middle position of the rectangular protrusion; the radial length of the connecting portion is greater than the radial length of the rectangular protrusion, so that a gap is formed between the outer diameter edge of the arc-shaped portion and the edge of the second radiation patch.

[0011] Preferably, when the first ceramic part and the second ceramic part are stacked up and down, the centers of the first ceramic part and the second ceramic part are vertically aligned, and the tuning branches of the first radiation patch on the first ceramic part and the tuning branches of the second radiation patch are also vertically aligned.

[0012] Preferably, surfaces of the first radiation patch and the second radiation patch are plated with mixed silver paste to form a silver-plated layer.

[0013] Preferably, the first ceramic part and the second ceramic part are made of ceramic with a dielectric constant of 45, and the ceramic loss tangent is 0.000189.

[0014] The beneficial effects of the present invention are as follows: the present invention discloses a satellite-borne ceramic antenna, comprising a first ceramic feeder, a second ceramic feeder, a feed network board and a housing, wherein the first ceramic feeder is arranged above the second ceramic feeder, the feed network board is arranged below the second ceramic feeder, and the feed network board is electrically connected to the first ceramic feeder and the second ceramic feeder respectively, the feed network board is also externally connected to a feed connector, and the first ceramic feeder, the second ceramic feeder and the feed network board are placed in the housing. The satellite-borne ceramic antenna has the characteristics of miniaturization and high gain, and has low cost, and has high conductivity and feed reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of an exploded view of an embodiment of a satellite-borne ceramic antenna of the present invention;

[0016] Figure 2 yes Figure 1 The assembly diagram of the embodiment shown;

[0017] Figure 3 is a cross-sectional view of another embodiment of the satellite-borne ceramic antenna of the present invention after assembly (only the radome is cross-sectionally viewed);

[0018] Figure 4 It is a schematic diagram of a power splitter board in another embodiment of the satellite-borne ceramic antenna of the present invention;

[0019] Figure 5 is a top view of a first ceramic feeder in another embodiment of a satellite-borne ceramic antenna of the present invention;

[0020] Figure 6 is a top view of a second ceramic width body in another embodiment of the satellite-borne ceramic antenna of the present invention;

[0021] Figure 7 It is a schematic diagram of the standing wave ratio in the transmitting frequency band of another embodiment of the satellite-borne ceramic antenna of the present invention;

[0022] Figure 8 It is a schematic diagram of the standing wave ratio of the receiving frequency band in another embodiment of the satellite-borne ceramic antenna of the present invention;

[0023] Fig. 9 It is a schematic diagram of polarization gain of receiving frequency band in another embodiment of the satellite-borne ceramic antenna of the present invention;

[0024] Fig.10 It is a schematic diagram of polarization gain in the transmitting frequency band of another embodiment of the satellite-borne ceramic antenna of the present invention;

[0025] Fig.11 It is a schematic diagram of the axial ratio of the receiving frequency band in another embodiment of the satellite-borne ceramic antenna of the present invention;

[0026] Fig.12 It is a schematic diagram of the axial ratio of the transmitting frequency band in another embodiment of the satellite-borne ceramic antenna of the present invention. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] Figure 1 is a schematic diagram of an exploded view of an embodiment of a satellite-borne ceramic antenna of the present invention, Figure 2 yes Figure 1 The assembly diagram of the embodiment shown is as follows, Figure 3 is a cross-sectional view of another embodiment of the satellite-borne ceramic antenna of the present invention after assembly (only the radome is cut away), Figure 4 This is a schematic diagram of a power splitter board in another embodiment of the satellite-borne ceramic antenna of the present invention. Figure 5 is a top view of the first ceramic feeder in another embodiment of the satellite-borne ceramic antenna of the present invention, Figure 6 is a top view of a second ceramic width body in another embodiment of the satellite-borne ceramic antenna of the present invention, combined with Figures 1 to 6 The satellite-borne ceramic antenna includes a first ceramic feed body 1, a second ceramic feed body 2, a feed network board 3 and a shell 4, wherein the first ceramic feed body 1 is arranged above the second ceramic feed body 2, the feed network board 3 is arranged below the second ceramic feed body 2, and the feed network board 3 is electrically connected to the first ceramic feed body 1 and the second ceramic feed body 2 respectively, the feed network board 3 is also externally connected to a feed connector, and the first ceramic feed body 1, the second ceramic feed body 2 and the feed network board 3 are placed in the shell 4.

[0030] It can be seen that the first ceramic feed 1 and the second ceramic feed 2 are both cylinders, the diameter of the first ceramic feed 1 is smaller than the diameter of the second ceramic feed 2, the feed network board 3 is also a circular structure, and the shell of the satellite-borne ceramic antenna is also a cylinder.

[0031] The satellite-borne ceramic antenna is in the form of a stacked antenna. The first ceramic feeder is a transmitting antenna, and the second ceramic feeder is a receiving antenna. The frequency band of the transmitting antenna of the satellite-borne ceramic antenna is 401.4MHz-402.4MHz, the frequency band of the receiving antenna is 470MHz-472MHz, and the polarization mode is left-hand circular polarization, which is used for circular polarization communication of satellites in this frequency band.

[0032] Preferably, a first radiating patch 11 is provided on the first ceramic feed body 1, and a second radiating patch 21 is provided on the second ceramic feed body 2, and the first radiating patch 11 and the second radiating patch 21 are both electrically connected to the feed network board 3. Specifically, the first ceramic feed body 1 includes a first ceramic portion 12 and a first radiating patch 11, and the first radiating patch 11 is attached to the upper surface of the first ceramic portion 12, and the second ceramic feed body 2 includes a second ceramic portion 22 and a second radiating patch 21, and the second radiating patch 21 is attached to the upper surface of the second ceramic portion 22, and the first radiating patch 11 and the second radiating patch 21 are both electrically connected to the feed network board 3.

[0033] Preferably, the first ceramic portion 12 and the second ceramic portion 22 serve as a resonant cavity, and the first radiation patch and the second radiation patch serve as a radiation unit.

[0034] Preferably, the surfaces of the first radiation patch 11 and the second radiation patch 21 are plated with mixed silver paste to form a silver-plated layer. The surface of a traditional microstrip antenna is usually copper-plated, but the patches in this embodiment are all plated with mixed silver paste. The conductivity of silver is better than that of copper, but considering that the price of silver itself is higher than that of copper, a mixed silver paste is used. On the one hand, the mixed silver paste reduces the processing cost, and on the other hand, it is easily oxidized and blackened compared to traditional silver plating, and the use of a mixed silver paste can avoid this situation.

[0035] Preferably, a vertical metallized hole A1 for improving the isolation of the first probe 5 and the second probe 6 is provided in the center of the first ceramic feed body 1 and the second ceramic feed body 2. The first ceramic feed body 1 and the second ceramic feed body 2 also have a probe hole A2 for inserting the first probe 5 and the second probe 6. The probe hole A2 includes a first probe hole A21 and a second probe hole A22.

[0036] Further preferably, the first radiation patch 11 is electrically connected to the feed network board 3 through the first probe 5. Specifically, one end of the first probe 5 is electrically connected to the silver-plated layer of the first radiation patch 11, and the other end is electrically connected to the feed network board 3. The first probe 5 passes through the first probe hole A21 correspondingly set on the first ceramic feed body 1 and the second ceramic feed body 2, and is insulated from the silver-plated layer of the second radiation patch 21. This design can enhance the stability of the first probe 5 and prevent it from shaking. The second radiation patch 21 is electrically connected to the feed network board 3 through the second probe 6. Specifically, one end of the second probe 6 is electrically connected to the silver-plated layer, and the other end is electrically connected to the feed network board 3. The second probe 6 passes through the second probe hole A22 additionally set on the second ceramic feed body 2. As mentioned above, this design enhances the stability of the second probe 6 and prevents it from shaking. Figure 6It can be seen that the aperture of the first probe hole A21 provided on the second ceramic feed body 2 is larger than the aperture of the second probe hole A22, so that the first probe 5 can be insulated from the second radiation patch 21 when passing through the second ceramic feed body 2.

[0037] Preferably, the feed network board 3 includes a power splitter board 31, a ceramic bridge is arranged on the power splitter board 31, and the ceramic bridge includes a first ceramic bridge 32 and a second ceramic bridge 33, the first ceramic bridge 32 is electrically connected to the first probe 5, the second ceramic bridge 33 is electrically connected to the second probe 6, and the first ceramic bridge 32 and the second ceramic bridge 33 are both provided with a connection end D3 electrically connected to the feed connector. The ceramic bridge has a wide operating frequency band and more stable performance. If other bridges, such as a microstrip bridge, are used, the antenna size becomes larger and it is difficult to achieve miniaturization.

[0038] Further preferably, the power dividing board 31 is provided with a first feeding hole D1 for electrically connecting to the first probe 5, and the first feeding hole D1 is connected to the first ceramic bridge 32. The power dividing board 31 is provided with a second feeding hole D2 for electrically connecting to the second probe 6, and the second feeding hole D2 is connected to the second ceramic bridge 33.

[0039] Further preferably, both the front and back surfaces of the power splitter board 31 are treated with tin, which can increase the conductivity of the power splitter board and the second ceramic feeder on the one hand, and facilitate welding on the other hand.

[0040] Preferably, the arrangement of the first ceramic bridge and the second ceramic bridge can generate two signals with equal amplitude and a phase difference of 90 degrees, which is convenient for realizing circular polarization.

[0041] Preferably, in order to increase reliability, a spring sheet is installed on the back of the power splitter board. When the probe is passed down from the front of the power splitter board, the first probe 5 and the second probe 6 are respectively welded to the spring sheet on the back of the power splitter board, thereby increasing the reliability of the welding point. The provision of the feeding spring sheet can make the electrical connection between the probe and the power splitter board 31 more stable, and it is not easy to disconnect the probe from the power splitter board, thereby ensuring the reliability of the probe feeding.

[0042] Preferably, the housing 4 includes a base 41 disposed below the feed network board 3 and a radome 42 covering the satellite-borne ceramic antenna, the base 41 is provided with an opening 411, and the base 41 is further provided with a detachable cover plate 43 for covering the opening 411. The provision of the cover plate 43 facilitates welding when the probe is plugged into the power splitter board.

[0043] Further preferably, the base is made of aluminum plate, and the antenna cover is made of wave-casting material to protect the satellite-borne ceramic antenna from damage by the external environment.

[0044] Further preferably, a screw groove L1 and a screw hole corresponding to the position of the screw groove L1 are opened on the edge of the base 41, a screw vertical groove L2 is opened on the edge of the second ceramic feeder 2 and corresponding to the position of the screw groove L1, and an internal threaded hole is opened at the opening edge of the antenna cover 42. The screw enters from the screw groove L1, passes through the screw hole, extends into the screw vertical groove L2, and is screwed into the internal threaded hole of the antenna cover 42, so that the antenna cover 42 is fixedly connected to the base 41.

[0045] Preferably, the material of the first ceramic part 12 and the second ceramic part 22 is ceramic with a dielectric constant of 45, and the ceramic loss tangent is 0.000189. Materials with high dielectric constants usually have low gain and large losses in the medium itself, but the gain of this type of ceramic can reach 5dBi, while the gain of other materials with the same dielectric constant is only 1-2dBi, and materials with high dielectric constants facilitate miniaturization of the antenna. The satellite-borne ceramic antenna has an outer dimension of 0.07 wavelengths, which is relatively small. At the same time, the processing cost of the ceramic itself is low, which has a cost advantage compared to the high price required for materials with high dielectric constants.

[0046] Preferably, the first ceramic part 12 and the first radiation patch 11 form a tuning branch 13 for adjusting the frequency of the satellite-borne ceramic antenna, or the second ceramic part 22 and the second radiation patch 21 form a tuning branch 23 for adjusting the frequency of the satellite-borne ceramic antenna, or the first ceramic part 12 and the first radiation patch 11 and the second ceramic part 22 and the second radiation patch 21 both form tuning branches for adjusting the frequency of the satellite-borne ceramic antenna.

[0047] like Figure 1 and Figure 5 As shown, it can be seen that the first radiation patch 11 and the second radiation patch 21 are both circular, and the tuning branch 13 is a rectangular protrusion arranged at the outer edge of the first radiation patch 11 and the second radiation patch 21, and there are 4 rectangular protrusions, which are evenly distributed along the outer edge of the first radiation patch 11 and the second radiation patch 21. Therefore, two adjacent rectangular protrusions are distributed 90 degrees apart along the circumferential direction.

[0048] Preferably, the circular diameter of the first radiation patch 11 is 56 mm, the circular diameter of the first ceramic part 12 is 66 mm, and the rectangular protrusion of the tuning branch 13 is 5 mm wide along the circumference and 4.11 mm long along the radial direction. The structural dimensions are related to the operating frequency range and radiation characteristics of the transmitting antenna.

[0049] Further preferably, the tuning branch 13 includes a connecting portion 131. The frequency of the satellite-borne ceramic antenna can be adjusted by changing the area of ​​the connecting portion 131. The smaller the area of ​​the connecting portion 131, the larger the frequency of the satellite-borne ceramic antenna. For example, while keeping the width of the first ceramic portion 12 located at the outer edge unchanged, the length of the connecting portion 131 is increased (in the direction pointing to the center of the circle), that is, the area of ​​the connecting portion 131 is increased, then the frequency of the satellite-borne ceramic antenna becomes smaller, and when the length of the connecting portion 131 is reduced, the frequency of the satellite-borne ceramic antenna becomes larger.

[0050] For the second radiation patch, a connection portion 231 is further radially arranged at the tuning branch 23, and the connection portion 231 is vertically connected to an arc portion 232 of an arc structure arranged circumferentially, and the connection portion 231 is arranged in the middle of the arc portion 232, and the arc portion 232 extends circumferentially in two directions. The connection portion 231 and the arc portion 232 are arranged in such a way that the metal patch is removed at the corresponding position of the second radiation patch to expose the ceramic part, that is, the connection portion 231 and the arc portion 232 are actually the exposed ceramic surface area. It can be seen that the circumferential width of the connecting portion 231 is smaller than the circumferential width of the rectangular protrusion of the tuning branch 23, and is located in the middle of the rectangular protrusion. The radial extension length of the connecting portion 231 toward the center of the circle is greater than the radial extension length of the rectangular protrusion toward the center of the circle, thereby also leaving a gap K1 between the outer diameter edge of the arc structure of the arc portion and the edge of the second radiation patch. When the radial length of the connecting portion 231 is increased, the width of the gap K1 can be increased accordingly, and the frequency of the satellite-borne ceramic antenna becomes smaller. When the width of the gap K1 is reduced, that is, the length of the connecting portion 231 is reduced, the frequency of the satellite-borne ceramic antenna becomes larger. The frequency of the satellite-borne ceramic antenna can be adjusted by setting the tuning branch, which is convenient for processing, has a relatively stable structure, reduces the influence of processing errors on the antenna performance, and does not require slotting of the antenna's radiation patch. If errors occur in the slotting process of the radiation patch, it will directly affect the performance of the antenna.

[0051] Preferably, the circular diameter of the second radiation patch 21 is 76 mm, the circular diameter of the second ceramic part 22 is 90 mm, the rectangular protrusion of the tuning branch 23 has a circumferential width of 8 mm and a radial length of 5.21 mm, the circumferential width of the connecting part 231 is 3.2 mm and the radial length is 7.5 mm, the arc of the arc part 232 is 30 degrees, and the radial length of the arc part 232 is 2.8 mm. The structural dimensions are related to the operating frequency range and radiation characteristics of the receiving antenna.

[0052] Combination Figure 1 and Figure 3When the first ceramic part 12 and the second ceramic part 22 are stacked up and down, the centers of the first ceramic part 12 and the second ceramic part 22 are vertically aligned, and the tuning branch 13 of the first radiation patch 11 on the first ceramic part 12 is also aligned with the tuning branch 23 of the second radiation patch 21. Further, the projection of the outer edge of the first ceramic part 12 on the upper surface of the second ceramic part 22 is within the inner diameter edge of the arc structure of the arc part 232, or the projection coincides with the inner diameter edge of the arc structure of the arc part 232, so that the first ceramic part 12 will not block the tuning branch 23 of the second ceramic part 22, thereby enhancing the radio wave receiving capability of the second radiation patch 21 of the second ceramic part 22.

[0053] Preferably, Figure 7 is a schematic diagram of the standing wave ratio in the transmitting frequency band of another embodiment of the satellite-borne ceramic antenna of the present invention, Figure 8 FIG. 1 is a schematic diagram of the standing wave ratio of the receiving frequency band in another embodiment of the satellite-borne ceramic antenna of the present invention. Figure 7 and Figure 8 It can be seen that the standing wave ratio of the satellite-borne ceramic antenna in the working frequency band is less than 2.

[0054] Preferably, Fig. 9 FIG. 1 is a schematic diagram of polarization gain of a receiving frequency band in another embodiment of a satellite-borne ceramic antenna of the present invention. The two arrows indicate curve S1 and curve S2 respectively. Fig.10 FIG. 1 is a schematic diagram of polarization gain in the transmitting frequency band of another embodiment of the satellite-borne ceramic antenna of the present invention. The two arrows indicate curves S3 and S4, respectively. Fig. 9 and Fig.10 It can be seen that the polarization gain of the satellite-borne ceramic antenna is high and the beam width can reach 100 degrees.

[0055] Preferably, Fig.11 FIG. 1 is a schematic diagram of the axial ratio of the receiving frequency band in another embodiment of the satellite-borne ceramic antenna of the present invention. The two arrows indicate curves S5 and S6 respectively. Fig.12 FIG. 1 is a schematic diagram of the axial ratio of the transmitting frequency band in another embodiment of the satellite-borne ceramic antenna of the present invention. The two arrows indicate curves S7 and S8 respectively. Fig.11 and Fig.12 It can be seen that the axial ratio of the satellite-borne ceramic antenna is less than 6 in both operating frequency bands.

[0056] Based on the above embodiments, the present invention discloses a satellite-borne ceramic antenna, comprising a first ceramic feeder, a second ceramic feeder, a feed network board and a housing, wherein the first ceramic feeder is arranged above the second ceramic feeder, the feed network board is arranged below the second ceramic feeder, and the feed network board is electrically connected to the first ceramic feeder and the second ceramic feeder respectively, the feed network board is also externally connected to a feed connector, and the first ceramic feeder, the second ceramic feeder and the feed network board are placed in the housing. The satellite-borne ceramic antenna has the characteristics of miniaturization and high gain, and has low cost, and has high conductivity and feeding reliability.

[0057] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A satellite-borne ceramic antenna, characterized in that: The invention comprises a first ceramic feeder as a transmitting antenna, a second ceramic feeder as a receiving antenna, a feed network board and a housing, wherein the first ceramic feeder is arranged above the second ceramic feeder, the feed network board is arranged below the second ceramic feeder, and the feed network board is electrically connected to the first ceramic feeder and the second ceramic feeder respectively, the feed network board is also externally connected to a feed connector, and the first ceramic feeder, the second ceramic feeder and the feed network board are placed in the housing; The first ceramic feed includes a first ceramic portion and a first radiation patch, the first radiation patch is attached to the upper surface of the first ceramic portion, and the second ceramic feed includes a second ceramic portion and a second radiation patch, the second radiation patch is attached to the upper surface of the second ceramic portion; The first radiation patch and the second radiation patch are both circular, and the first radiation patch and the second radiation patch are respectively provided with tuning branches for adjusting the transmitting frequency and the receiving frequency of the satellite-borne ceramic antenna; the tuning branches are rectangular protrusions arranged on the circular outer edges of the first radiation patch and the second radiation patch, and there are four rectangular protrusions in total, which are evenly distributed along the circular outer edges of the first radiation patch and the second radiation patch; Each of the tuning branches of the second radiation patch is further radially provided with a connecting portion, and the connecting portion is vertically connected to an arc-shaped portion of a circumferentially arranged arc-shaped structure. The connecting portion and the arc-shaped portion are both ceramic surface areas exposed after cutting the second radiation patch, and the connecting portion is arranged in the middle of the arc-shaped portion, and the arc-shaped portion extends in two directions along the circumferential direction; the circumferential width of the connecting portion is smaller than the circumferential width of the rectangular protrusion of the tuning branch, and is located in the middle position of the rectangular protrusion; the radial length of the connecting portion is greater than the radial length of the rectangular protrusion, so that a gap is formed between the outer diameter edge of the arc-shaped portion and the edge of the second radiation patch.

2. The satellite-borne ceramic antenna according to claim 1, characterized in that: The first radiation patch is electrically connected to the feed network board through a first probe, and the first probe passes through the first ceramic feeder and the second ceramic feeder; the second radiation patch is electrically connected to the feed network board through a second probe, and the second probe passes through the second ceramic feeder.

3. The satellite-borne ceramic antenna according to claim 2, characterized in that: The feeding network board includes a power division board, on which a ceramic bridge is arranged, and the ceramic bridge includes a first ceramic bridge and a second ceramic bridge, the first ceramic bridge is electrically connected to the first probe and then electrically connected to the first radiation patch, the second ceramic bridge is electrically connected to the second probe and then electrically connected to the second radiation patch, and the first ceramic bridge and the second ceramic bridge are both provided with a connection end electrically connected to the feeding connector.

4. The satellite-borne ceramic antenna according to claim 1, characterized in that: When the first ceramic part and the second ceramic part are stacked up and down, the centers of the first ceramic part and the second ceramic part are vertically aligned, and the tuning branches of the first radiation patch on the first ceramic part and the tuning branches of the second radiation patch on the first ceramic part are also vertically aligned.

5. The satellite-borne ceramic antenna according to claim 4, characterized in that: The surfaces of the first radiation patch and the second radiation patch are plated with mixed silver paste to form a silver-plated layer.

6. The satellite-borne ceramic antenna according to claim 5, characterized in that: The material of the first ceramic part and the second ceramic part is ceramic with a dielectric constant of 45, and the ceramic loss tangent is 0.000189.

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