A K-band broadband dual circularly polarized antenna for satellite internet

Abstract

The invention provides a K-band broadband dual circularly polarized antenna applied to satellite internet, belonging to the field of circularly polarized antennas. The antenna comprises a radiation unit, a first dielectric layer, a metal stratum, an adhesive layer, a second dielectric layer, and a feeding network which are stacked from top to bottom. The radiation unit comprises two first radiation patches and two second radiation patches. The first radiation patch is provided with two vertically intersecting long rectangular slots, and the second radiation patch is provided with two vertically non-intersecting short rectangular slots. The first radiation patch and the second radiation patch are respectively connected to the metal stratum through metal columns, the metal stratum is provided with a first coupling slot and a second coupling slot, and the metal stratum is provided with a first rectangular slot, a second rectangular slot, a third rectangular slot, and a fourth rectangular slot. The feeder network comprises a first microstrip feeder and a second microstrip feeder. The antenna structure has a low cross-section, can achieve a wider impedance bandwidth, and the two feeding ports can operate in the same frequency range.

Description

Technical Field

[0001] The present invention relates to the technical field of circular polarization antennas, and in particular to a K-band broadband dual circular polarization antenna applied to satellite Internet. Background Art

[0002] With the rapid development of fifth-generation mobile communication technology, millimeter wave frequency bands are increasingly being used to provide high data transmission efficiency and wide spectrum resources. In order to meet the needs of communication, for fields such as satellite communication and radar reconnaissance, the communication target is no longer limited to a fixed position. Compared with traditional linearly polarized antennas, circularly polarized antennas are insensitive to target position and polarization mode, can receive incoming waves of any polarization mode, and have the following significant advantages: (1) orthogonality of rotation and ability to resist multipath interference; (2) when circularly polarized waves encounter the Faraday effect caused by the ionosphere, they can avoid polarization mismatch. Therefore, circularly polarized antennas have received widespread attention in recent years.

[0003] In the prior art, the planar dual circularly polarized antenna disclosed in the Chinese invention patent application with publication number CN116365222A, "A planar dual circularly polarized antenna based on orthogonal magnetic dipoles", comprises: a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, a metal stratum, a first metal strip, a second metal strip, a first microstrip feeder and a second microstrip feeder, the first dielectric substrate, the metal stratum, the second dielectric substrate and the third dielectric substrate are stacked from top to bottom, a first coupling slot and a second coupling slot with an intersection angle of 90 degrees are provided in the middle of the metal stratum, the first metal strip and the second metal strip are located on the upper surface of the first dielectric substrate, the first metal strip is connected to the metal stratum through two first metallized through holes, and the second metal strip is connected to the metal stratum through two second metallized through holes. The first coupling slot is coupled to the first microstrip feeder line for exciting the first metallized through hole and the first metal strip, and can generate a left-handed circularly polarized radiation wave in an upward direction. The second coupling slot is coupled to the second microstrip feeder line for exciting the second metallized through hole and the second metal strip, and can generate a right-handed circularly polarized radiation wave in an upward direction. The circularly polarized antenna only relies on the characteristics of the unit antenna itself to achieve circularly polarized radiation. However, the planar dual circularly polarized antenna still has the following problems: (1) The antenna is a three-layer PCB structure, in which the feeding structure adopts a two-layer dielectric board, which will increase the cross-sectional height of the antenna and increase the processing cost; (2) The impedance bandwidth of the antenna is relatively narrow and the two feeding ports cannot operate in the same frequency range, so that the scope of use in satellite communications is relatively single. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to solve the problems of the existing dual circular polarization antenna, that is, the profile height is relatively high, the impedance bandwidth is relatively narrow, and the two feeding ports cannot operate in the same frequency range.

[0005] The present invention solves the above technical problems through the following technical solutions: a K-band broadband dual circular polarization antenna applied to satellite Internet, the antenna comprising a radiation unit, a first dielectric layer, a metal stratum, an adhesive layer, a second dielectric layer, and a feeding network stacked from top to bottom, the radiation unit comprising two first radiation patches and two second radiation patches symmetrical about the center of the antenna, a gap between adjacent first radiation patches and second radiation patches, two long rectangular slots intersecting vertically are provided on the first radiation patch, two short rectangular slots not intersecting vertically are provided on the second radiation patch, and the long rectangular slots are arranged on the second radiation patch. The rectangular groove and the short rectangular groove are located on both sides of the gap and the openings of the rectangular grooves are arranged opposite to each other, the first radiation patch and the second radiation patch are respectively connected to the metal stratum through metal columns, the metal stratum is provided with a first coupling slot and a second coupling slot that intersect vertically, and the metal stratum is provided with a first rectangular groove, a second rectangular groove, a third rectangular groove and a fourth rectangular groove of different sizes, the third rectangular groove and the fourth rectangular groove have an overlapping area, the metal stratum is cut at the vertex where the overlapping area intersects, and the feeder network includes a first microstrip feeder coupled to the first coupling slot and a second microstrip feeder coupled to the second coupling slot.

[0006] Preferably, the first microstrip feed line is provided with a first feeding port, and when the first feeding port is fed, the first microstrip feed line is coupled with the first coupling slot, exciting the metal column and the radiation unit to generate right-handed circularly polarized radiation waves, and the second microstrip feed line is provided with a second feeding port, and when the second feeding port is fed, the second microstrip feed line is coupled with the second coupling slot, exciting the metal column and the radiation unit to generate left-handed circularly polarized radiation waves.

[0007] Preferably, the first radiation patch and the second radiation patch are both rectangular microstrip patches.

[0008] Preferably, the four outer corner vertices of the radiation unit composed of four rectangular microstrip patches are respectively cut corners, and the cut corners are isosceles right triangles.

[0009] Preferably, the gap is located directly above the first coupling gap and the second coupling gap.

[0010] Preferably, the first microstrip feed line is orthogonal to the second microstrip feed line and does not intersect, the intersection of the second microstrip feed line and the first microstrip feed line is an air bridge, the air bridge includes a short microstrip line and two through holes, the short microstrip line is located on the upper surface of the second dielectric layer and its two ends are respectively connected to the second microstrip feed line through through holes.

[0011] Preferably, the long rectangular groove and the short rectangular groove have the same width.

[0012] Preferably, the metal column is close to the first coupling gap and the second coupling gap and penetrates the first dielectric layer, and the height of the metal column is the same as the thickness of the first dielectric layer.

[0013] Preferably, the first dielectric layer and the second dielectric layer are both made of Rogers 5880 dielectric material, and the adhesive layer is made of Rogers 4450F dielectric material.

[0014] Preferably, the thickness of the first dielectric layer is 0.762 mm, the thickness of the adhesive layer is 0.1 mm, and the thickness of the second dielectric layer is 0.254 mm.

[0015] The advantages provided by the present invention are:

[0016] (1) The present invention introduces an asymmetric slot structure on the radiating element of the antenna to change the flow path of the current on the surface of the radiating patch. The two rectangular slots of different lengths are arranged so that the current on the surface of the radiating patch flows through different paths, so that the excited orthogonal modes produce a 90° phase separation, thereby realizing circularly polarized radiation waves; the antenna adopts a slot coupling method, and by switching the excitation of the first feeding port and the second feeding port, it can generate right-handed circularly polarized radiation waves and left-handed circularly polarized radiation waves respectively. By leaving gaps between the asymmetric slotted patches of the antenna and changing the electric field distribution of the antenna patch, the resonant frequency of the TM10 mode can be increased and the resonant frequency of the TM20 mode can be reduced at the same time, and a wider impedance bandwidth can be achieved; the feeding network adopts a layer of dielectric board, and the microstrip feed line is arranged on the same layer. The antenna structure has a low profile and less consumables. The two feeding ports can work in the same frequency range and the structure is more compact. By cutting rectangular grooves on the metal stratum and cutting the corners of the overlapping rectangular grooves, the flow direction of the current on the metal ground is changed, so that the 3-dB axial ratio bandwidth of the antenna is greatly widened. At the same time, the axial ratio curve remains stable below 3-dB, and the circular polarization effect is more prominent.

[0017] (2) The present invention can change the flow direction of the current on the surface of the radiation patch by chamfering the four outer corner vertices of the radiation unit composed of four rectangular microstrip patches, so that the current direction can be orthogonal at every T / 4 moment.

[0018] (3) The present invention introduces an air bridge structure so that the overlapping portion of the feed lines passes through a through hole and a short microstrip line from the upper layer of the second dielectric layer, thereby avoiding the first microstrip feed line and the second microstrip feed line from crossing and overlapping.

[0019] (4) The present invention adopts PCB technology, has a simple structure, high reliability, and has the advantages of wide axial ratio bandwidth and strong anti-interference ability. Left-hand circular polarization and right-hand circular polarization can be switched between each other and work in the same frequency range. It can be applied to the receiving frequency band of satellite Internet and can help solve the loss and narrow bandwidth problems caused by polarization mismatch of the antenna in satellite communications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A schematic diagram of a K-band broadband dual circularly polarized antenna for satellite Internet provided by an embodiment of the present invention;

[0021] Figure 2 A side view of a K-band broadband dual circularly polarized antenna for satellite Internet provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of a radiation unit and a first dielectric layer in a K-band broadband dual circularly polarized antenna for satellite internet provided by an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of a metal formation in a K-band broadband dual circularly polarized antenna for satellite internet provided by an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of a second dielectric layer and a feeding network in a K-band broadband dual circularly polarized antenna for satellite internet provided by an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of S parameters of a K-band broadband dual circularly polarized antenna applied to satellite Internet provided by an embodiment of the present invention;

[0026] Figure 7 An antenna axial ratio parameter diagram of a K-band broadband dual circularly polarized antenna applied to satellite Internet provided by an embodiment of the present invention when fed at a first feeding port;

[0027] Figure 8 The radiation pattern of the K-band broadband dual circularly polarized antenna for satellite internet provided in an embodiment of the present invention at the xoz plane at a frequency of 19.5 GHz when the antenna is fed at the first feeding port;

[0028] Fig. 9 The radiation pattern of the K-band broadband dual circularly polarized antenna for satellite internet provided in an embodiment of the present invention at a yoz plane at a frequency of 19.5 GHz when the antenna is fed at the first feeding port;

[0029] Fig.10 An antenna axial ratio parameter diagram of a K-band broadband dual circularly polarized antenna applied to satellite Internet provided by an embodiment of the present invention when fed at a second feeding port;

[0030] Fig.11 The radiation pattern of the K-band broadband dual circularly polarized antenna for satellite internet provided in an embodiment of the present invention at the xoz plane at a frequency of 19.5 GHz when the antenna is fed at the second feeding port;

[0031] Fig.12The radiation pattern of the K-band broadband dual circularly polarized antenna applied to satellite Internet provided by an embodiment of the present invention in the yoz plane at a frequency of 19.5 GHz when the antenna is fed at the second feeding port;

[0032] In the figure: 1 first dielectric layer, 2 adhesive layer, 3 second dielectric layer, 4 radiation unit, 41 first radiation patch, 42 second radiation patch, 5 metal layer, 51 first rectangular slot, 52 second rectangular slot, 53 third rectangular slot, 54 fourth rectangular slot, 6 second microstrip feed line, 7 first microstrip feed line, 8 metal column, 9 long rectangular slot, 10 short rectangular slot, 11 first coupling slot, 12 second coupling slot, 13 first feeding port, 14 second feeding port, 15 gap, 16 air bridge. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1 As shown, a spatial rectangular coordinate system o-xyz is established, including an origin o, an x-axis, a y-axis, and a z-axis. The x-axis, the y-axis, and the z-axis represent the front-to-back direction, the left-to-right direction, and the up-down direction, respectively.

[0035] See also Figure 2 The present embodiment provides a K-band broadband dual circular polarization antenna for satellite Internet, including a radiation unit 4, a first dielectric layer 1, a metal layer 5, an adhesive layer 2, a second dielectric layer 3, and a feeding network stacked from top to bottom. The first dielectric layer 1 is made of Rogers 5880 dielectric material with a thickness of 0.762 mm, the adhesive layer 2 is made of Rogers 4450F dielectric material with a thickness of 0.1 mm, and the second dielectric layer 3 is made of Rogers 5880 dielectric material with a thickness of 0.254 mm.

[0036] like Figure 3 As shown, the radiation unit 4 includes two first radiation patches 41 symmetrical about the center of the antenna, and two second radiation patches 42 symmetrical about the center of the antenna. There is a gap 15 between adjacent first radiation patches 41 and second radiation patches 42. The width of the gap 15 is Ws, and the gap 15 is located directly above the first coupling slot 11 and the second coupling slot 12.

[0037] The resonant frequency of the TM20 mode of a traditional microstrip antenna (without gap) is twice that of the TM10 mode. It is difficult to achieve a wide impedance bandwidth through these two resonant modes. Different from the traditional microstrip antenna, the dual circular polarization antenna of the present invention has gaps between the asymmetric slotted patches. By changing the electric field distribution of the antenna patch, the resonant frequency of the TM10 mode can be increased and the resonant frequency of the TM20 mode can be reduced at the same time, which is reflected in the S parameter curve, such as Figure 6 As shown, it can be seen that the resonant frequencies of these two modes are very close, which can achieve a wide impedance bandwidth.

[0038] The first radiation patch 41 is provided with two long rectangular grooves 9 intersecting vertically, and the second radiation patch 42 is provided with two short rectangular grooves 10 not intersecting vertically. The long rectangular groove 9 and the short rectangular groove 10 are located on both sides of the gap 15 and the openings of the rectangular grooves are arranged opposite to each other. The length of the long rectangular groove 9 is L1, the length of the short rectangular groove 10 is L2, and the widths of the long rectangular groove 9 and the short rectangular groove 10 are the same, both W1. The first radiation patch 41 and the second radiation patch 42 are connected to the metal layer 5 through metal pillars 8 respectively. The metal pillars 8 are close to the first coupling gap 11 and the second coupling gap 12 and penetrate the first dielectric layer 1. The diameter of the metal pillars 8 is ds, the distance between two adjacent metal pillars 8 along the x-axis direction is xs, the distance between two adjacent metal pillars 8 along the y-axis direction is ys, and the height of the metal pillars 8 is the same as the thickness of the first dielectric layer 1.

[0039] Continue reading Figure 3 , the first radiation patch 41 and the second radiation patch 42 are both rectangular microstrip patches, the radiation unit 4 composed of four rectangular microstrip patches has a length of Lc and a width of Wc, and the four external corner vertices of the radiation unit 4 are respectively chamfered, and the chamfered corners are isosceles right triangles, and the lengths of the two right-angled sides of the triangle are xj. By chamfering the radiation patch, the flow direction of the current on the surface of the radiation patch can be changed, so that the current direction can be rotated to orthogonal at every T / 4 moment.

[0040] like Figure 4As shown, the metal stratum 5 is provided with a first coupling slot 11 and a second coupling slot 12 which intersect vertically. The length and width of the first coupling slot 11 and the second coupling slot 12 are the same, both of which are Ls and Ws. The metal stratum 5 is provided with a first rectangular groove 51, a second rectangular groove 52, a third rectangular groove 53 and a fourth rectangular groove 54 of different sizes. The length of the first rectangular groove 51 is k1 and the width is v1. The length of the second rectangular groove 52 is k2 and the width is v2. The length of the third rectangular groove 53 is k3 and the width is v3. The length of the fourth rectangular groove 54 is k4 and the width is v4. The third rectangular groove 53 and the fourth rectangular groove 54 have an overlapping area. The metal stratum 5 is cut at the vertex where the overlapping area intersects. The cut angle is an isosceles right triangle, and the lengths of the two right-angled sides of the triangle are xj. By cutting rectangular grooves on the metal layer 5 and cutting the corners of the overlapping rectangular grooves, the flow direction of the current on the metal ground is changed, so that the 3-dB axial ratio bandwidth of the antenna is greatly widened. At the same time, the axial ratio curve remains stable below 3-dB, and the circular polarization effect is more prominent.

[0041] like Figure 5 As shown, the feed line network includes a first microstrip feed line 7 coupled to a first coupling slot 11, and a second microstrip feed line 6 coupled to a second coupling slot 12. The first microstrip feed line 7 is provided with a first feeding port 13. When the first feeding port 13 is fed, the first microstrip feed line 7 is coupled with the first coupling slot 11, and the metal column 8 and the radiation unit 4 are stimulated to generate right-handed circularly polarized radiation waves. The second microstrip feed line 6 is provided with a second feeding port 14. When the second feeding port 14 is fed, the second microstrip feed line 6 is coupled with the second coupling slot 12, and the metal column 8 and the radiation unit 4 are stimulated to generate left-handed circularly polarized radiation waves.

[0042] The first microstrip feed line 7 is orthogonal to the second microstrip feed line 6 and does not intersect. The intersection of the second microstrip feed line 6 and the first microstrip feed line 7 is an air bridge 16. The air bridge 16 includes a short microstrip line and two through holes. The short microstrip line is located on the upper surface of the second dielectric layer 3 and its two ends are respectively connected to the second microstrip feed line 6 through through holes. The through holes can be metal columns. The metal columns penetrate the second dielectric layer 3 and are located on both sides of the first microstrip feed line 7. The feeding network of the antenna of the present invention adopts a dielectric board, and the microstrip feed lines are arranged on the same layer. The antenna structure has a low profile and less consumables. In order to avoid the first microstrip feed line 7 and the second microstrip feed line 6 from crossing and overlapping, an air bridge structure is introduced to make the overlapping part of the feed line pass through the upper layer of the dielectric board through the metal column and a short microstrip line. The feed lines are arranged on the same layer so that the two feeding ports of the antenna can work in the same frequency range and the structure is more compact.

[0043] The present invention introduces an asymmetric slot structure on the radiation unit 4 of the antenna to change the flow path of the current on the surface of the radiation patch. The rectangular slot is opened near the strongest current of the TM12 mode, so that the undesirable TM12 mode can be suppressed, and at the same time, the TM10 and TM20 modes are not affected, so that the radiation pattern of the antenna is greatly improved, and the effect of high gain is achieved. The setting of two rectangular slots of different lengths makes the path of the current on the surface of the radiation patch different, so that the excited orthogonal mode produces a 90° phase separation, thereby realizing circularly polarized radiation waves. Circular polarization can be achieved by only changing the radiation unit of the antenna, and there is no need to use rotary feeding to achieve circular polarization. The antenna adopts a slot coupling method, and switches the excitation of the first feeding port 13 and the second feeding port 14 to generate right-handed circularly polarized radiation waves and left-handed circularly polarized radiation waves respectively. The present invention adopts PCB technology, has a simple structure and high reliability, and has the advantages of wide axial ratio bandwidth and strong anti-interference ability. Left-hand circular polarization and right-hand circular polarization can be switched with each other and work in the same frequency range. It can be applied to the receiving frequency band of satellite Internet, and can help solve the loss and narrow bandwidth problems caused by polarization mismatch of antenna in satellite communication.

[0044] Figure 6 This is a schematic diagram of the S parameters of the dual circularly polarized antenna of the present invention, that is, the input reflection coefficients of the first feeding port 13 and the second feeding port 14. It can be seen that the circularly polarized antenna operates in the K band, the first feeding port 13 is in the frequency band of 16.65 GHz to 21.68 GHz, S11<-10dB, and the relative bandwidth reaches 25.7%, and the second feeding port 14 is in the frequency band of 16.79 GHz to 22.09 GHz, S22<-10dB, and the relative bandwidth reaches 27.1%.

[0045] Figure 7 This is a diagram of antenna axial ratio parameters of the dual circularly polarized antenna of the present invention when it is fed at the first feeding port 13. At this time, the 3-dB axial ratio bandwidth covers the frequency band from 16.7 GHz to 22.67 GHz, and the relative bandwidth reaches 30.6%.

[0046] like Figure 8 and Fig. 9 As shown, when the dual circularly polarized antenna of the present invention is fed at the first feeding port 13, at the frequency of 19.5 GHz, whether in the xoz plane or the yoz plane, the right-hand circular polarization gain of the antenna is greater than the left-hand circular polarization gain, and the antenna mainly radiates right-hand circularly polarized waves. It can be seen that stimulating the first feeding port 13 can generate right-hand circularly polarized radiation waves.

[0047] Fig.10 This is a diagram of antenna axial ratio parameters of the dual circularly polarized antenna of the present invention when it is fed at the second feeding port 14. At this time, the 3-dB axial ratio bandwidth covers the frequency band from 17.16 GHz to 22.1 GHz, and the relative bandwidth reaches 25.3%.

[0048] like Fig.11 and Fig.12 As shown, when the dual circularly polarized antenna of the present invention is fed at the second feeding port 14, at the frequency of 19.5 GHz, whether in the xoz plane or the yoz plane, the left-hand circular polarization gain of the antenna is greater than the right-hand circular polarization gain, and the antenna mainly radiates left-hand circularly polarized waves. It can be seen that stimulating the second feeding port 14 can generate left-hand circularly polarized radiation waves.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A K-band broadband dual circular polarization antenna for satellite Internet, characterized in that: The antenna includes a radiation unit, a first dielectric layer, a metal stratum, an adhesive layer, a second dielectric layer, and a feeding network which are stacked from top to bottom. The radiation unit includes two first radiation patches and two second radiation patches which are symmetrical about the center of the antenna, respectively. There is a gap between adjacent first radiation patches and second radiation patches. The first radiation patch is provided with two vertically intersecting long rectangular grooves, and the second radiation patch is provided with two vertically non-intersecting short rectangular grooves. The long rectangular grooves and the short rectangular grooves are located on both sides of the gap and the openings of the rectangular grooves are arranged opposite to each other. The first radiation patch and the second radiation patch are respectively connected to the metal stratum through metal columns. The metal stratum is provided with a first coupling slot and a second coupling slot which are vertically intersecting, and the metal stratum is provided with a first rectangular slot, a second rectangular slot, a third rectangular slot and a fourth rectangular slot of different sizes. The third rectangular slot has an overlapping area with the fourth rectangular slot, and the metal stratum is cut at the vertex where the overlapping area intersects. The feeder network includes a first microstrip feeder coupled to the first coupling slot and a second microstrip feeder coupled to the second coupling slot.

2. The K-band broadband dual circular polarization antenna for satellite Internet according to claim 1, characterized in that: The first microstrip feed line is provided with a first feeding port. When the first feeding port is fed, the first microstrip feed line is coupled with the first coupling slot, and the metal column and the radiation unit are stimulated to generate right-handed circularly polarized radiation waves. The second microstrip feed line is provided with a second feeding port. When the second feeding port is fed, the second microstrip feed line is coupled with the second coupling slot, and the metal column and the radiation unit are stimulated to generate left-handed circularly polarized radiation waves.

3. The K-band broadband dual circular polarization antenna for satellite Internet according to claim 1, characterized in that: The first radiation patch and the second radiation patch are both rectangular microstrip patches.

4. The K-band broadband dual circular polarization antenna for satellite Internet according to claim 3, characterized in that: The four outer corner vertices of the radiation unit composed of four rectangular microstrip patches are respectively cut corners, and the cut corners are isosceles right triangles.

5. The K-band broadband dual circular polarization antenna for satellite Internet according to claim 1, characterized in that: The gap is located directly above the first coupling gap and the second coupling gap.

6. The K-band broadband dual circular polarization antenna for satellite Internet according to claim 1, characterized in that: The first microstrip feed line is orthogonal to the second microstrip feed line and does not intersect. The intersection of the second microstrip feed line and the first microstrip feed line is an air bridge, which includes a short microstrip line and two through holes. The short microstrip line is located on the upper surface of the second dielectric layer and its two ends are connected to the second microstrip feed line through through holes.

7. The K-band broadband dual circular polarization antenna for satellite Internet according to claim 1, characterized in that: The widths of the long rectangular groove and the short rectangular groove are the same.

8. The K-band broadband dual circular polarization antenna for satellite Internet according to claim 1, characterized in that: The metal column is close to the first coupling gap and the second coupling gap and penetrates the first dielectric layer. The height of the metal column is the same as the thickness of the first dielectric layer.

9. The K-band broadband dual circular polarization antenna for satellite Internet according to claim 1, characterized in that: The first dielectric layer and the second dielectric layer are both made of Rogers 5880 dielectric material, and the adhesive layer is made of Rogers 4450F dielectric material.

10. The K-band broadband dual circular polarization antenna for satellite Internet according to claim 1, characterized in that: The thickness of the first dielectric layer is 0.762 mm, the thickness of the adhesive layer is 0.1 mm, and the thickness of the second dielectric layer is 0.254 mm.

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