CN115986388A - Millimeter wave antenna for low-orbit satellite communication - Google Patents
Millimeter wave antenna for low-orbit satellite communication Download PDFInfo
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- CN115986388A CN115986388A CN202211671579.5A CN202211671579A CN115986388A CN 115986388 A CN115986388 A CN 115986388A CN 202211671579 A CN202211671579 A CN 202211671579A CN 115986388 A CN115986388 A CN 115986388A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a millimeter wave antenna for low-orbit satellite communication, which comprises a dielectric substrate, a first circularly polarized radiator, seven conductor columns, a 90-degree circular arc, a second circularly polarized radiator, a ground plane and a feed point. The dielectric substrate has four layers of conductors. The first circularly polarized radiator is on the first layer and provides a first Ku band mode and a first Ka band mode. The seven conductor columns are vertically connected with the four layers of conductors and are uniformly arranged on the left side of the first circularly polarized radiator according to a semicircular arc. The center of the 90-degree arc is the projection of the first center of the circle on the second layer, and the second end is connected with the first circularly polarized radiator through the through hole, so that the polarization of the first Ku waveband mode and the first Ka waveband mode is right-handed. The second circularly polarized radiator on the third layer is rectangular with truncated corners, a second Ku waveband mode and a second Ka waveband mode are provided, and the grounding surface is on the fourth layer. The feed point crosses the ground plane and the second circularly polarized radiator by the through hole and is connected with the 90-degree circular arc. The invention provides a dual-frequency right-hand circularly polarized mode.
Description
Technical Field
The invention relates to a satellite communication antenna, in particular to a millimeter wave antenna for low-orbit satellite communication.
Background
Nowadays, mobile communication technology is gradually developed towards Millimeter Wave (Millimeter Wave) based on the requirements of data transmission rate, used bandwidth and signal response capability, for example, fifth generation mobile communication (5G) is mainly divided into two frequency ranges, one is an application often called Sub 5G below 6GHz, and the other is a Millimeter Wave frequency range, which provides huge data traffic and higher information response capability. The millimeter wave has high operating frequency, high dielectric loss and high requirement on the manufacturing accuracy of the antenna module. The other technology of millimeter wave communication is low-orbit satellite communication technology, and compared with the fifth generation mobile communication which needs a base station on the ground, the low-orbit satellite communication uses a low-orbit satellite above the ground, and is particularly favorable for being applied to remote areas, sea surfaces and other limited terrain areas. The low-orbit satellite communication technology is one of the most important communication technologies in the future, and has functions and advantages that cannot be replaced by the conventional terrestrial mobile communication technology.
With the powerful functions of the communication device, the mobile communication device of the user terminal is the most widely applied product, and under the condition that the volume of the mobile communication device is limited, the size requirement of the antenna is bound to be severer and severer based on the continuous development of the communication technology, and for a smaller antenna design of a client, the product can be designed to have larger application elasticity and space so as to improve the competitiveness of the product. However, low orbit satellite communication uses circularly polarized electromagnetic wave signals. The size of a circular polarized antenna is generally larger than that of a linearly polarized antenna, and if multiple frequency bands of low orbit satellite communication are to be used, the circular polarized antenna is based on the consideration of bandwidth requirements, and the miniaturization of the circular polarized antenna is a more stringent test for the development and manufacturers of the antenna.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a millimeter wave antenna for low-orbit satellite communication, which reduces the size of the antenna and meets the communication bandwidth requirement.
The technical scheme of the invention is as follows: a millimeter-wave antenna for low-orbit satellite communications, comprising:
a dielectric substrate having four layers of conductors, which are a first layer, a second layer, a third layer and a fourth layer in sequence;
a first circular polarized radiator, on the first layer, the first circular polarized radiator is to cut the first disc with two parallel chords of the same length by taking a first circle center of the first disc as a center, and to provide a first Ku band mode and a first Ka band mode by removing conductor regions remaining after two blocks outside the two parallel chords;
seven conductor columns vertically penetrating through the dielectric substrate and connecting the first layer, the second layer, the third layer and the fourth layer, wherein the seven conductor columns are uniformly arranged on a semicircular arc on the left side of the first circularly polarized radiator by taking the first circle center as a circle center, and an included angle formed by a connecting line of the first conductor column and the last conductor column and the two parallel strings is 45 degrees;
a 90-degree arc on the second layer, wherein the center of the 90-degree arc is a projection of the first center of the circle on the second layer, and the 90-degree arc has a first end and a second end, the first end is located on the right side of a connecting line between a first one and a last one of the seven conductive columns, the second end is located on a connecting line between a first one and a last one of the seven conductive columns, the connecting line between the first end and the second end is parallel to the two parallel strings, the second end is connected to the first circularly polarized radiator through a through hole, and the 90-degree arc is used for enabling polarizations of the first Ku band mode and the first Ka band mode to be right-handed;
a second circularly polarized radiator on the third layer, the second circularly polarized radiator being shaped as a truncated rectangle providing a second Ku band mode and a second Ka band mode, a geometric center of the rectangle being a projection of the first circle center on the third layer, wherein a short side of the rectangle is parallel to the two parallel chords, and wherein the rectangle is truncated by a right triangle at a vertex on the right side and a vertex on the left side of the rectangle;
a ground plane on the fourth layer; and
and a feed point located on the fourth layer, the feed point crossing the ground plane and the second circularly polarized radiator by using a through hole and connecting the first end of the 90-degree arc.
Further, the radius of the 90-degree arc is smaller than the radius of the first disk.
Further, the frequency ranges of the first Ku band mode and the second Ku band mode are partially overlapped to increase the circular polarization bandwidth, and the frequency ranges of the first Ka band mode and the second Ka band mode are partially overlapped to increase the circular polarization bandwidth.
Further, the projections of the first end and the second end on the first layer are located within the first circularly polarized radiator, and the projections of the first end and the second end on the third layer are located within the second circularly polarized radiator.
Further, the two parallel chords include a right side chord and a left side chord, and a projection of the 90 degree arc on the first layer crosses the right side chord.
Further, the right triangle is an isosceles triangle with an apex angle of 90 degrees, and the length of the waist of the isosceles triangle with the apex angle of 90 degrees is smaller than the distance between the projection of the feed point on the third layer and the short side of the right side of the rectangle.
Further, the dielectric substrate has a first dielectric between the first layer and the second layer, a second dielectric between the second layer and the third layer, and a third dielectric between the third layer and the fourth layer, wherein the first dielectric is roger ro4003 and 19.7 m thick, wherein the second dielectric is roger ro4450f and 11.8 m thick, wherein the third dielectric is roger ro4003 and 19.7 m thick.
Further, the radius of the first disc is 60 meters, the length of the two parallel chords is 102 meters, the radius of the 90-degree circular arc is 45 meters, the lengths of the short side and the long side of the rectangle are 93 meters and 152 meters respectively, the right triangle is an isosceles triangle with a vertex angle of 90 degrees, and the length of the waist of the isosceles triangle with a vertex angle of 90 degrees is 16.5 meters.
Further, the two parallel chords include a right side chord and a left side chord, a projection of the feedpoint on the first level is at a distance of 11 meters from the right side chord, wherein a projection of the feedpoint on the third level is at a distance of 45 meters from a short side of the rectangle, and a projection of the feedpoint on the third level is at a distance of 15 meters from a long side of the rectangle.
Further, a radius length of the first disc determines a resonant frequency of the first Ku band mode, the first Ku band mode is a fundamental resonant mode of the first circularly polarized radiator, the first Ka band mode is a higher-order mode of the first circularly polarized radiator, a length of a long side of the rectangle determines a resonant frequency of the second Ku band mode, and a length of a short side of the rectangle determines a resonant frequency of the second Ka band mode.
Compared with the prior art, the invention has the advantages that:
the invention designs a dual-frequency circularly polarized millimeter wave antenna, wherein a first circularly polarized radiator is directly connected and fed in to generate dual-frequency and circularly polarized modes, and the dual-frequency and circularly polarized modes of the first circularly polarized radiator are right handed by utilizing a 90-degree circular arc feeding mode. The second circularly polarized radiator is feed coupled and also provides a dual-band right-hand circularly polarized mode. The dual-band antenna design has the advantages of reducing the antenna area and providing larger right-hand circularly polarized bandwidth, and only uses a single feed-in, thereby having high industrial application value.
Drawings
Fig. 1 is a schematic diagram of a first layer structure of a millimeter wave antenna for low-orbit satellite communication according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a second layer structure of a millimeter-wave antenna for low-orbit satellite communication according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a third layer structure of a millimeter-wave antenna for low-orbit satellite communication according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a fourth layer structure of a millimeter-wave antenna for low-orbit satellite communication according to an embodiment of the present invention.
Fig. 5 is a graph of S11 parameters versus frequency variation of a millimeter wave antenna for low-orbit satellite communication according to an embodiment of the present invention.
Fig. 6 is a graph of axial ratio versus frequency change for a millimeter wave antenna for low-orbit satellite communication according to an embodiment of the present invention.
Fig. 7 is a graph of gain versus frequency for a millimeter wave antenna for low-orbit satellite communications according to an embodiment of the present invention.
Fig. 8 is a graph of efficiency versus frequency variation for a millimeter wave antenna for low orbit satellite communications provided by an embodiment of the present invention.
Fig. 9 is a schematic diagram of a millimeter wave antenna for low-orbit satellite communication fed by a coplanar waveguide according to an embodiment of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Referring to fig. 1 to 4, a millimeter wave antenna for low-orbit satellite communication according to an embodiment of the present invention includes a dielectric substrate 1, a first circularly polarized radiator 2, seven conductive pillars 3, a 90-degree circular arc 4, a second circularly polarized radiator 5, a ground plane 6, and a feed point 7. The dielectric substrate 1 has four layers of conductors, such as copper conductors, in sequence as a first layer 11, a second layer 12, a third layer 13 and a fourth layer 14, the conductor structure of the first layer 11 is shown in fig. 1, the conductor structure of the second layer 12 is shown in fig. 2, the conductor structure of the third layer 13 is shown in fig. 3, and the conductor structure of the fourth layer 14 is shown in fig. 4. A first medium is present between the first layer 11 and the second layer 12, a second medium is present between the second layer 12 and the third layer 13, and a third medium is present between the third layer 13 and the fourth layer 14. The first circular polarized radiator 2 is on the first layer 11, the first circular polarized radiator 2 is centered at the first center 200 of the first disc 20, the first disc 20 is cut by two parallel chords 21 of the same length, and the conductor region (indicated by the hatched region) remaining after removing two blocks 210 (the range of which is indicated by the dotted line in the figure) outside the two parallel chords 21. The two parallel chords 21 are not only parallel to each other, but also of the same length. The first circularly polarized radiator 2 provides a first Ku band mode and a first Ka band mode. The first circularly polarized radiator 2 is a resonant mode that uses two parallel chords 21 to cut the first disc 20 to produce circular polarization. The radius length of the first disc 20 determines the resonant frequency of a first Ku band mode, which is the fundamental resonant mode of the first circularly polarized radiator 2, and the first Ka band mode, which is the higher-order mode of the first circularly polarized radiator 2. The Ku band (or frequency band) is a lower frequency band of 17.3GHz to 20.2GHz, and the Ka band is a higher frequency band of 27.5GHz to 30 GHz. In addition, in fig. 1, the position of the through hole of the feed point 7 is also shown, and the conductor of the through hole is not conducted with the first circularly polarized radiator 2, which will be described later.
Seven conductor columns 3 vertically penetrate through the dielectric substrate 1 and connect the first layer 11, the second layer 12, the third layer 13 and the fourth layer 14, the seven conductor columns 3 are uniformly arranged on a semicircular arc on the left side of the first circularly polarized radiator 2 by taking the first circle center 200 as the circle center, and an included angle formed by a connecting line between the first conductor column and the last conductor column 3 and the two parallel strings 21 is 45 degrees. In fig. 1, it can be seen that the seven conductor columns 3 are on the left semi-circular arc, while the first circularly polarized radiator 2 exhibits an angle tilted 45 degrees to the left based on two parallel chords 21. The seven conductive columns 3 are used to adjust the offset of the radiation pattern so that the radiation direction is perpendicular to the dielectric substrate 1 to meet the application requirements of satellite communication.
The 90-degree arc 4 is located on the second layer 12, and the center of the 90-degree arc 4 is the projection of the first center 200 on the second layer 12, and has a first end 41 and a second end 42, the first end 41 is located on the right side of the connection line between the first and the last of the seven conductive columns 3, the second end 42 is located on the connection line between the first and the last of the seven conductive columns 3, wherein the connection line between the first end 41 and the second end 42 is parallel to the two parallel strings 21, the second end 42 is connected to the first circularly polarized radiator 2 through a via, and the first end 41 is a via conductor directly connected to the feed point 7. The 90 degree arc 4 is used to make the polarization of the first Ku band mode and the first Ka band mode right-handed. The width of the 90-degree circular arc 4 is not limited, but is preferably about 5 m, for example, and slightly increasing the width or decreasing the width does not significantly affect the circular polarization characteristic. In the present embodiment, the radius of the 90-degree arc 4 is preferably smaller than the radius of the first disk 20. In the present embodiment, preferably, the two parallel chords 21 include a right side chord and a left side chord, and the projection of the 90-degree arc 4 on the first layer 11 crosses the right side chord, but is not limited thereto. In fig. 2, the 90-degree arc 4 is a quarter arc present in the upper right region.
The second circularly polarized radiator 5 is in the third layer 13 and is shaped as a truncated rectangle providing a second Ku band mode and a second Ka band mode. The truncated corner for generating circular polarization in the rectangular shape is formed by selecting two opposite corners among four corners, and cutting off a pair of small area areas of the same size at the two opposite corners. The geometric center 500 of the rectangle is the projection of the first center 200 on the third layer 13, wherein the short side 51 of the rectangle is parallel to the two parallel chords 21, wherein the vertex 501 on the right side of the rectangle and the vertex 502 on the left side of the rectangle are each truncated by a right triangle to the rectangle. The right triangle is, for example, an isosceles triangle having an apex angle of 90 degrees, and the use of an isosceles triangle having an apex angle of 90 degrees as the truncated angle of the rectangle is a parameter for simplifying the adjustment of the circular polarization characteristic. In the present embodiment, a vertex connecting the upper right side short side 51 and the lower right side long side 52 is referred to as a right vertex, a vertex connecting the lower left side short side 51 and the upper left side long side 52 is referred to as a left vertex, and these two vertexes are respectively formed by an isosceles triangle having an apex angle of 90 degrees with respect to the rectangular truncated angle. Therefore, the second circularly polarized radiator 5 generates a circularly polarized resonance mode by using two isosceles triangle truncated rectangles with an apex angle of 90 degrees. Referring to fig. 3, the feed point 7 is fed by coupling through the via without contacting the second circularly polarized radiator 5, so that both the second Ku band mode and the second Ka band mode are right-hand polarized. The length of the long side 52 of the rectangle determines the resonance frequency of the second Ku band mode, and the length of the short side 51 of the rectangle determines the resonance frequency of the second Ka band mode. In terms of structure, in the figure of the present embodiment, the length of the waist of the isosceles triangle with the vertex angle of 90 degrees is smaller than the distance between the projection of the feeding point 7 on the third layer 13 (i.e. the through hole of the feeding point 7) and the short side 51 on the right side of the rectangle.
The ground plane 6 is in the fourth layer 14. The feed point 7 is located in the fourth layer 14, and the feed point 7 passes through the ground plane 6 of the fourth layer 14 and the second circularly polarized radiator 5 of the third layer 13, and connects to the first end 41 of the 90-degree arc 4 of the second layer 12. The detailed feed connection of the feed point 7 by means of a through hole is explained in the following, in that the feed point 7 passes through and connects the ground plane 6 with the second circularly polarized radiator 5 by means of a through hole, passes through and connects the first end 41 of the 90-degree circular arc 4 to connect the first circularly polarized radiator 2 by means of the second end 41 of the 90-degree circular arc 4, so that the first circularly polarized radiator 2 is fed in directly. For the second circularly polarized radiator 5, the conductor of the feed point 7 via the third layer 13 creates an annular gap, which is fed in with capacitive coupling. In addition, the through-hole of the feed point 7 may create a via in the first circularly polarized radiator 2 of the first layer 11 (as shown in fig. 1), which is not effective in the via of the first layer 11; if the first layer 11 is not through-hole and the conductor is flat at the projection position of the feeding point 7, the buried via process is needed (no through-hole is formed between the first layer 11 and the second layer 12), neither of which affects the antenna characteristics.
Further, based on the case that the connection line between the first end 41 and the second end 42 of the 90-degree arc 4 is parallel to the two parallel chords 21, the projection of the first end 41 and the second end 42 of the 90-degree arc 4 on the first layer 11 is located inside the first circularly polarized radiator 2, and the projection of the first end 41 and the second end 42 of the 90-degree arc 4 on the third layer 13 is also located inside the second circularly polarized radiator 5. Importantly, the second end 42 serves as a connection feed point for the first circularly polarized radiator 2, so that the first Ka-band mode, which is a high-order mode, is a right-hand polarization mode. For the first Ku band mode of the fundamental mode, if there is no 90-degree arc 4 path and the via feed is directly made at the position of the second end 42, the first Ku band mode of lower frequency is a left-hand polarization mode. In fact, if the first Ka band mode of the high-order mode is not considered, and only the first Ku band mode of the lower frequency is right-handed polarized, the through hole feeding is directly performed at the position of the first end 41, and the 90-degree circular arc 4 is not used (here, the first Ka band mode of the high-order mode is left-handed polarized if the first end 41 is directly fed). By using the feeding mode of the 90-degree circular arc 4, the first Ku waveband mode with lower frequency can achieve the result of a right-handed polarization mode, and the first Ka waveband mode with a high-order mode can also be the right-handed polarization mode. In other words, the 90 degree arc 4 is used to make the polarization of the first Ku band mode and the first Ka band mode right-handed.
As can be seen from the above antenna structure, the projections of the centers of the seven conductive columns 3, the center of the 90-degree arc 4, and the geometric center 500 of the second circularly polarized radiator 5 on the first layer 11 are all coincident with the first center 200 of the first circularly polarized radiator 2, so as to form a vertical stack structure. The shapes in the drawings are not necessarily to scale and are merely for illustrative purposes. Regarding the detailed size of the antenna structure, the thickness of each layer of conductor is 0.7 mil (mils), and the medium layer has three layers, wherein the first medium is made of roger ro4003 and has a thickness of 19.7 mils; the material of the second medium is roger ro4450f with a thickness of 11.8 m and the material of the third medium is roger ro4003 with a thickness of 19.7 m. The radius of the first disc 20 is 60 metres, the length of the two parallel chords 21 is 102 metres, and the projection of the feed point 7 on the first layer 11 is 11 metres from the nearest parallel chord 21 (the right-hand chord). The radius of the 90 degree arc 4 is 45 meters. The lengths of the short side 51 and the long side 52 of the rectangle are 93 m and 152 m, respectively, and the lengths of the short side 51 and the long side 52 are lengths before the truncation, wherein the length of the waist of an isosceles triangle with an apex angle of 90 degrees is 16.5 m. The distance between the projection of the feedpoint 7 on the third layer 13 and the short side 51 of the rectangle is 45 m, and the distance between the projection of the feedpoint 7 on the third layer 13 and the long side 52 of the rectangle is 15 m. The position of the feed point 7 is chosen to have an impedance value close to 50 ohms and to excite the right-hand polarization mode.
Referring to fig. 5, a curve CPW corresponds to the characteristics of the antenna structure, and a curve CPWG is fed by the coplanar waveguide with the structure shown in fig. 9. The frequency ranges of the first Ku band mode and the second Ku band mode are partially coincident to increase the circular polarization bandwidth, and the Ku band modes in fig. 5 are very close together and almost completely coincident, so the curves of the modes only appear to be single modes. The frequency ranges of the first and second Ka-band modes are partially coincident to increase the circular polarization bandwidth. Taking the curve CPWG as an example, two modes are clearly visible in the Ka band in fig. 5, wherein the lower frequency mode is generated by the first circularly polarized radiator 2, wherein the higher frequency mode is generated by the second circularly polarized radiator 5, and similarly, with respect to the curve CPW, the coincident modes are also visible. In the designed desired frequency range, please refer to the curves CPW in fig. 5 to 8, the S11 parameter of the applied frequency can reach-10 dB. Referring to fig. 6, the axial ratio in the desired frequency range reaches 3 (dB) or less. Also, referring to fig. 7 and 8, the antenna has good gain and antenna efficiency. Referring to fig. 9, all the structures are represented by the first layer L1, the second layer L2, the third layer L3 and the ground layer GND, in terms of actual manufacturing, the performance of the antenna product is affected by using a joint mode of a feed point, if the ground plane of the fourth layer 14 is directly fed by using a connector, the performance (such as directivity or radiation field type direction) of the original design parameters of the antenna is not affected basically as long as the ground plane is large enough, and the feeding mode represented by fig. 9 is easily applied to the situation that the antenna substrate and the circuit board are shared or assembled together, and the curve CPWG in the characteristics of fig. 5 to 8 is the antenna characteristic result of the feeding mode. It can be seen that the curve CPW and the curve CPWG show that the antenna performance of the two antennas is not greatly different, and the two antennas can approximately reflect the antenna performance required by the design parameters, so that the antenna design has a good application effect on the actual product surface, and has high practicability in the aspect of commercialization.
In summary, the millimeter wave antenna for low orbit satellite communication according to the embodiments of the present invention is a dual-band circularly polarized millimeter wave antenna, the first circularly polarized radiator is directly connected to feed in, and generates dual-band and circularly polarized modes, and the dual-band and circularly polarized modes of the first circularly polarized radiator are right-handed by using a 90-degree circular arc feeding manner. The second circularly polarized radiator is feed coupled and also provides a dual-band right-hand circularly polarized mode. The dual-band antenna design has the advantages of reducing the antenna area and providing larger right-hand circularly polarized bandwidth, and only uses a single feed-in, thereby having high industrial application value.
Claims (10)
1. A millimeter-wave antenna for low-orbit satellite communications, comprising:
the dielectric substrate is provided with four layers of conductors, namely a first layer, a second layer, a third layer and a fourth layer in sequence;
a first circular polarized radiator, on the first layer, the first circular polarized radiator is to cut the first disc with two parallel chords of the same length by taking a first circle center of the first disc as a center, and to provide a first Ku band mode and a first Ka band mode by removing conductor regions remaining after two blocks outside the two parallel chords;
seven conductor columns vertically penetrating through the dielectric substrate and connecting the first layer, the second layer, the third layer and the fourth layer, wherein the seven conductor columns are uniformly arranged on a semicircular arc on the left side of the first circularly polarized radiator by taking the first circle center as a circle center, and an included angle formed by a connecting line of the first conductor column and the last conductor column and the two parallel strings is 45 degrees;
a 90-degree arc on the second layer, wherein the center of the 90-degree arc is a projection of the first center of the circle on the second layer, and the 90-degree arc has a first end and a second end, the first end is located on the right side of a connecting line between a first one and a last one of the seven conductive columns, the second end is located on a connecting line between a first one and a last one of the seven conductive columns, the connecting line between the first end and the second end is parallel to the two parallel strings, the second end is connected to the first circularly polarized radiator through a through hole, and the 90-degree arc is used for enabling polarizations of the first Ku band mode and the first Ka band mode to be right-handed;
a second circularly polarized radiator on the third layer, the second circularly polarized radiator being shaped as a truncated rectangle providing a second Ku band mode and a second Ka band mode, a geometric center of the rectangle being a projection of the first circle center on the third layer, wherein a short side of the rectangle is parallel to the two parallel chords, and wherein the rectangle is truncated by a right triangle at a vertex on the right side and a vertex on the left side of the rectangle;
a ground plane in the fourth layer; and
and a feed point located on the fourth layer, the feed point crossing the ground plane and the second circularly polarized radiator by using a through hole and connecting the first end of the 90-degree arc.
2. The millimeter-wave antenna for low-orbit satellite communication according to claim 1, wherein the radius of the 90-degree circular arc is smaller than the radius of the first disc.
3. A millimeter wave antenna for low orbit satellite communications according to claim 1, wherein the frequency ranges of the first Ku band mode and the second Ku band mode are partially overlapping to increase circular polarization bandwidth, and the frequency ranges of the first Ka band mode and the second Ka band mode are partially overlapping to increase circular polarization bandwidth.
4. The millimeter wave antenna for low orbit satellite communication of claim 1, wherein the projection of the first end and the second end on the first layer is within the first circularly polarized radiator and the projection of the first end and the second end on the third layer is within the second circularly polarized radiator.
5. The millimeter-wave antenna for low-orbit satellite communication according to claim 1, wherein the two parallel chords include a right chord and a left chord, and a projection of the 90-degree arc on the first layer crosses the right chord.
6. The millimeter wave antenna for low orbit satellite communication according to claim 1, wherein the right triangle is an isosceles triangle with a vertex angle of 90 degrees, and the length of the waist of the isosceles triangle with a vertex angle of 90 degrees is smaller than the distance between the projection of the feed point on the third layer and the short side on the right side of the rectangle.
7. A millimeter wave antenna for low orbiting satellite communications according to claim 1, wherein the dielectric substrate has a first dielectric between the first layer and the second layer, a second dielectric between the second layer and the third layer, a third dielectric between the third layer and the fourth layer, wherein the material of the first dielectric is roger ro4003 and the thickness is 19.7 m, wherein the material of the second dielectric is roger ro4450f and the thickness is 11.8 m, wherein the material of the third dielectric is roger ro4003 and the thickness is 19.7 m.
8. The millimeter-wave antenna for low-orbit satellite communication according to claim 1, wherein the radius of the first disk is 60 m, the lengths of the two parallel chords are 102 m, wherein the radius of the 90-degree circular arc is 45 m, wherein the lengths of the short side and the long side of the rectangle are 93 m and 152 m, respectively, wherein the right triangle is an isosceles triangle with a vertex angle of 90 degrees, and the length of the waist of the isosceles triangle with a vertex angle of 90 degrees is 16.5 m.
9. The millimeter-wave antenna for low-orbit satellite communication according to claim 1, wherein the two parallel strings comprise a right-side string and a left-side string, and a projection of the feed point on the first layer is at a distance of 11 m from the right-side string, wherein a projection of the feed point on the third layer is at a distance of 45 m from a short side of the rectangle, and a projection of the feed point on the third layer is at a distance of 15 m from a long side of the rectangle.
10. The millimeter wave antenna for low orbit satellite communication of claim 1, wherein the radius length of the first disc determines the resonant frequency of the first Ku band mode, the first Ku band mode being a fundamental resonant mode of the first circularly polarized radiator, the first Ka band mode being a higher order mode of the first circularly polarized radiator, wherein the length of the long side of the rectangle determines the resonant frequency of the second Ku band mode, and the length of the short side of the rectangle determines the resonant frequency of the second Ka band mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211671579.5A CN115986388A (en) | 2022-12-26 | 2022-12-26 | Millimeter wave antenna for low-orbit satellite communication |
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| CN202211671579.5A CN115986388A (en) | 2022-12-26 | 2022-12-26 | Millimeter wave antenna for low-orbit satellite communication |
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| CN202211671579.5A Pending CN115986388A (en) | 2022-12-26 | 2022-12-26 | Millimeter wave antenna for low-orbit satellite communication |
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