CN113097718B - Dual-frequency dual-circular-polarization common-caliber antenna for satellite communication - Google Patents
Dual-frequency dual-circular-polarization common-caliber antenna for satellite communication Download PDFInfo
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- CN113097718B CN113097718B CN202110243328.6A CN202110243328A CN113097718B CN 113097718 B CN113097718 B CN 113097718B CN 202110243328 A CN202110243328 A CN 202110243328A CN 113097718 B CN113097718 B CN 113097718B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
Abstract
The invention discloses a dual-frequency dual-circular-polarization common-aperture antenna for satellite communication, which comprises a first dielectric substrate, a second dielectric substrate and a third dielectric substrate which are sequentially stacked from bottom to top; the bottom surface of the first dielectric substrate is provided with a feed network structure, and the top surface of the first dielectric substrate is provided with a metal ground; a low-frequency radiation unit is arranged on the top surface of the second dielectric substrate; a high-frequency radiation unit is arranged on the top surface of the third dielectric substrate; the feed network structure comprises a low-frequency port feed network structure and a high-frequency port feed network structure, and band-pass filtering structures are respectively arranged in the feed network structures; the high-low frequency port feed network structure is connected with the high-low frequency radiating unit through a gap coupling structure; the high port isolation is realized by introducing the band-pass filtering structure, the feed network structure is connected with the radiation unit through the gap coupling structure, and the impedance and the axial ratio bandwidth are improved by introducing the gap coupling structure; the high-frequency and low-frequency radiating units are designed in a layered mode, so that the overall size of the antenna is reduced; the whole design is simple, and the weight is light.
Description
Technical Field
The invention belongs to the technical field of wireless communication antennas, and particularly relates to a dual-frequency dual-circular-polarization common-caliber antenna for satellite communication.
Background
Antennas are the core devices in a communication system, as a means of receiving and transmitting electromagnetic wave signals, which play an increasingly important role in modern radio communication systems; however, the utilization of the electromagnetic spectrum gradually becomes saturated, and how to design an antenna with high gain and multi-band coverage in a limited size and a complex electromagnetic environment becomes an important problem to be solved; meanwhile, as the integration degree of electronic devices is increasing day by day, the miniaturization and the broadband of the antenna are also hot spots of research nowadays.
In a radio communication system, a circularly polarized antenna can receive circularly polarized waves corresponding to the handedness and linear polarized waves, has higher isolation degree of electromagnetic waves with different handedness and unique signal transmission characteristics, and can reduce the interference of an external electromagnetic environment to a certain extent; therefore, circularly polarized waves are used in satellite communication systems to transmit signals; however, the existing circularly polarized antenna has the technical problems of large size space occupation, low isolation between ports and narrow axial ratio bandwidth of circular polarization.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a dual-frequency dual-circular-polarization common-caliber antenna for satellite communication, which aims to solve the technical problems of larger size space and lower port isolation of the conventional circular-polarization antenna.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention discloses a dual-frequency dual-circular polarization common-caliber antenna for satellite communication, which comprises a first dielectric substrate, a second dielectric substrate and a third dielectric substrate which are sequentially stacked from bottom to top; the bottom surface of the first dielectric substrate is provided with a feed network structure, and the top surface of the first dielectric substrate is provided with a metal ground; a low-frequency radiation unit is arranged on the top surface of the second dielectric substrate; a high-frequency radiation unit is arranged on the top surface of the third dielectric substrate;
the feed network structure comprises a low-frequency port feed network structure and a high-frequency port feed network structure, and band-pass filtering structures are respectively arranged in the low-frequency port feed network structure and the high-frequency port feed network structure; the low-frequency port feed network structure is connected with the low-frequency radiating unit through the gap coupling structure, and the high-frequency port feed network structure is connected with the high-frequency radiating unit through the gap coupling structure.
Furthermore, the low-frequency port feeder line network structure comprises a first feeder line, a first band-pass filtering structure and a second feeder line, wherein one end of the first feeder line is connected with the low-frequency port, the other end of the first feeder line is connected with one end of the first band-pass filtering structure, and the other end of the first band-pass filtering structure is connected with the second feeder line;
the first band-pass filtering structure comprises two first open rings which are symmetrically arranged, and the open ends of the two first open rings are oppositely arranged; one end of one of the first split rings is connected with the first feeder line, the other end of the first split ring is arranged at an interval with one end of the other first split ring, and the other end of the other first split ring is connected with the second feeder line;
the second feeder line comprises an annular feeder line and four L-shaped feeder lines, the annular feeder line is arranged in the center of the first dielectric substrate 1 and is of an open ring structure, the four L-shaped feeder lines are uniformly arranged in the circumferential direction of the annular feeder line, and the four L-shaped feeder lines are respectively connected with the annular feeder line.
Furthermore, four L-shaped gaps are arranged on the metal ground; the four L-shaped gaps are uniformly distributed in an annular shape, and the long edges of the L-shaped gaps are arc-shaped and are opposite to the annular feeder line; the short side of the L-shaped slit is arranged at the end part of the long side and extends towards the center of the metal ground.
Furthermore, the low-frequency radiation unit comprises four arc-shaped radiators which are uniformly distributed in an annular shape, and the L-shaped gaps on the metal ground are arranged in a right-to-right mode.
Furthermore, the high-frequency port feeder line network structure comprises a third feeder line, a second band-pass filtering structure and a coupling feeder line; one end of the third feeder line is connected with the high-frequency port, and the other end of the third feeder line is connected with the second band-pass filtering structure;
the second band-pass filtering structure comprises two second split rings which are symmetrically arranged, and the open ends of the two second split rings are oppositely arranged; one end of one second split ring is connected with the third feeder line, and the other end of the second split ring is arranged at an interval with one end of the other second split ring;
and the coupling feeder is arranged in the center of the first dielectric substrate and is connected with the other end of the other second split ring through an air bridge structure.
Further, the air bridge structure is arranged at the intersection point of the high-frequency port feeder network structure and the low-frequency port feeder network structure; the air bridge structure comprises a first metal through hole, a second metal through hole and a fourth feeder line;
the first metal through hole and the second metal through hole vertically penetrate through the first dielectric substrate and are respectively positioned on two sides of the annular feeder line; the fourth feeder line is arranged on the top surface of the first dielectric substrate and positioned between the first metal through hole and the second metal through hole; one end of the first metal through hole is connected with the second band-pass filtering structure, the other end of the first metal through hole is connected with one end of the second metal through hole through a fourth feeder line, and the other end of the second metal through hole is connected with the coupling feeder line.
Furthermore, two Y-shaped gaps are also arranged on the metal ground; two Y type gaps are symmetrically arranged at the center of the first medium substrate, one ends of the two Y type gaps are connected, and the other ends of the two Y type gaps are uniformly dispersed along the circumferential direction.
Furthermore, a circular through hole is formed in the center of the second dielectric substrate and is opposite to the center of the third dielectric substrate.
Further, the high-frequency radiating unit is a circular radiator, and the circular radiator is arranged at the center of the third dielectric substrate.
Furthermore, the centers of the first dielectric substrate, the second dielectric substrate and the third dielectric substrate are arranged in a collinear manner, and the second dielectric substrate and the third dielectric substrate are both dielectric substrates with circular structures.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a dual-frequency dual-circular-polarization common-aperture antenna for satellite communication.A low-frequency port feed network structure and a high-frequency port feed network structure are respectively provided with a band-pass filtering structure, and the two band-pass filtering structures are introduced to realize higher port isolation; the low-frequency or high-frequency port feed network structure is connected with the low-frequency or high-frequency radiating unit through the gap coupling structure, and the impedance and the axial ratio bandwidth of the antenna are improved by introducing the gap coupling structure; the high-frequency and low-frequency radiating units are designed in a layered mode, so that the overall size of the antenna is reduced; the antenna has simple integral design and light weight, and can be applied to various satellite communication devices.
Furthermore, a band-pass filtering structure formed by combining two split rings is adopted in the low-frequency port feed network structure, and the two split rings are split resonant rings, so that the interference of high-frequency signals on the low-frequency port is effectively reduced; the circular polarization radiation feed is realized by arranging the annular feeder with the opening ring structure, wherein the annular feeder is 3/4 opening circular ring structure and is used as a sequential feed structure; by uniformly arranging the four L-shaped feeders in the circumferential direction of the circumferential feeder, 90-degree phase difference feeding in four directions is realized, and impedance matching is realized by the L-shaped feeders, so that the four L-shaped feeders finally realize phase feeding of 0 degree, 90 degrees, 180 degrees and 270 degrees.
Furthermore, the circular polarization coupling radiation is realized by arranging four L-shaped gaps on the metal ground and just facing the annular feeder.
Furthermore, a band-pass filtering structure formed by combining two split rings is adopted in the high-frequency port feeder line structure, and a coupling feeder line structure is arranged, so that the impedance matching effect is realized, and the interference of low-frequency signals on the high-frequency port is effectively reduced; the coupling feeder line is connected with the split ring through an air bridge, so that the crossing between high-frequency and low-frequency port feeder line network structures is avoided.
Furthermore, the metal through holes are formed in the first dielectric substrate, and the coupling feeder line and the split ring are effectively connected by the metal through holes and the feeder line, so that the same-layer intersection between high-frequency and low-frequency port feeder line network structures is avoided.
Furthermore, two Y-shaped gaps are symmetrically arranged in the center of the first dielectric substrate on the metal ground, and the superposed structural characteristics of the two Y-shaped gaps enable the upper-layer radiator to generate circularly polarized signals, so that circularly polarized radiation is ensured.
Furthermore, a circular through hole is formed in the center of the second dielectric substrate and is opposite to the center of the third dielectric substrate; and a cylindrical hollow through hole is formed in the center of the third medium substrate by utilizing the circular through hole, so that the high-frequency gain and the impedance broadband are effectively improved.
Drawings
Fig. 1 is a schematic view of an overall structure of a common aperture antenna according to the present invention;
fig. 2 is a schematic diagram of a feed network structure in the common-aperture antenna according to the present invention;
fig. 3 is a schematic diagram of a metal ground structure in the common aperture antenna according to the present invention;
FIG. 4 is a schematic view of an air bridge structure in a common-aperture antenna according to the present invention;
fig. 5 is a schematic structural diagram of a second dielectric substrate in the co-aperture antenna according to the present invention;
fig. 6 is a schematic structural diagram of a second dielectric substrate in the co-aperture antenna according to the present invention;
fig. 7 is a diagram illustrating a simulation result of return loss and isolation of the high and low frequency ports of the common aperture antenna according to the embodiment;
fig. 8 is a diagram illustrating a result of a gain simulation of two frequency bands in the common aperture antenna according to the embodiment;
fig. 9 is a diagram illustrating an axial ratio simulation result of two frequency bands in the common aperture antenna according to the embodiment.
The first dielectric substrate 1, the second dielectric substrate 2 and the third dielectric substrate 3; 12 a metal ground; 111 a first feed line, 112 a first bandpass filtering structure, 113 a second feed line, 114 a third feed line, 115 a second bandpass filtering structure, 116 a coupling feed line; 117 a first metal via, 118 a second metal via; 121L type slot, 122 fourth feed line, 123Y type slot; 21 low-frequency radiating elements and 31 high-frequency radiating elements.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more apparent, the following embodiments further describe the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a dual-frequency dual-circular-polarization common-aperture antenna for satellite communication, which is characterized by comprising a first dielectric substrate 1, a second dielectric substrate 2 and a third dielectric substrate 3 which are sequentially stacked from bottom to top; the bottom surface of the first dielectric substrate 1 is provided with a feed network structure, and the top surface is provided with a metal ground 12; the top surface of the second dielectric substrate 2 is provided with a low-frequency radiation unit 21; the top surface of the third dielectric substrate 3 is provided with a high-frequency radiation unit 31.
The feed network structure comprises a low-frequency port feed network structure and a high-frequency port feed network structure, and band-pass filtering structures are respectively arranged in the low-frequency port feed network structure and the high-frequency port feed network structure; the low-frequency port feed network structure is connected with the low-frequency radiating unit 21 through a gap coupling structure, and the high-frequency port feed network structure is connected with the high-frequency radiating unit 31 through another gap coupling structure.
The low-frequency port feeder line network structure comprises a first feeder line 111, a first band-pass filtering structure 112 and a second feeder line 113, wherein one end of the first feeder line 111 is connected with the low-frequency port, the other end of the first feeder line is connected with one end of the first band-pass filtering structure 112, and the other end of the first band-pass filtering structure 112 is connected with the second feeder line 113.
The first bandpass filtering structure 112 includes two first open rings symmetrically arranged, and open ends of the two first open rings are arranged oppositely; one end of one of the first split rings is connected with the first feeder line 111, the other end of the one of the first split rings is arranged at an interval with one end of the other first split ring, and the other end of the other first split ring is connected with the third feeder line 114; wherein, two split rings are split ring resonators.
The third feeder 114 includes an annular feeder disposed in the center of the first dielectric substrate 1 and four L-shaped feeders, the annular feeder is in an open ring structure, the four L-shaped feeders are uniformly disposed in the circumferential direction of the annular feeder, and the four L-shaped feeders are respectively connected to the annular feeder.
Four L-shaped gaps 121 are arranged on the metal ground 12, and the four L-shaped gaps 121 are uniformly distributed in an annular shape; the long edge of the L-shaped gap 121 is arc-shaped and is arranged opposite to the annular feeder line; the short side of the L-shaped slit 121 is arranged at the end of the long side and extends towards the center of the metal ground 12.
The high-frequency port feeder network structure comprises a third feeder 114, a second band-pass filter structure 115 and a coupling feeder 116; one end of the third feeder line 114 is connected to the high frequency port, and the other end is connected to the second band-pass filter structure 115; the second band-pass filtering structure 115 comprises two second split rings which are symmetrically arranged, and the open ends of the two second split rings are oppositely arranged; one end of one of the second split rings is connected to the third feed line 114, and the other end is spaced from one end of the other second split ring; the coupling feed line 116 is arranged at the center of the first dielectric substrate 1, and the coupling feed line 116 is connected with the other end of the other second split ring through an air bridge structure.
The air bridge structure is arranged at the intersection point of the high-frequency port feeder network structure and the low-frequency port feeder network structure and is positioned on the first dielectric substrate 1; the air bridge structure includes a first metal via 117, a second metal via 118, and a fourth feed line 122; the first metal through hole 117 and the second metal through hole 118 vertically penetrate through the first dielectric substrate 1 and are respectively located at two sides of the annular feeder line; the fourth feed line 122 is disposed on the top surface of the first dielectric substrate 1 and located between the first metal via 117 and the second metal via 118; one end of the first metal via 117 is connected to the second band-pass filter structure 115, the other end is connected to one end of the second metal via 118 through the fourth feed line 122, and the other end of the second metal via 118 is connected to the coupling feed line 116; two Y-shaped gaps 123 are also arranged on the metal ground 12; the two Y-shaped gaps 123 are symmetrically arranged in the center of the first dielectric substrate 1, one ends of the two Y-shaped gaps 123 are connected, and the other ends of the two Y-shaped gaps 123 are uniformly dispersed along the circumferential direction.
The center of the second dielectric substrate 2 is provided with a circular through hole, and the circular through hole is opposite to the center of the third dielectric substrate 3; a circular air column through hole is formed below the center of the third dielectric substrate 3 by arranging the circular through hole; the low-frequency radiating unit 21 is arranged on the top surface of the second dielectric substrate 2, the low-frequency radiating unit 21 comprises four arc-shaped radiators which are symmetrically and uniformly distributed in a ring shape, and the L-shaped gaps 121 on the metal ground 12 are arranged in a right-to-right mode.
The high-frequency radiating unit 31 is a circular radiator, and the circular radiator is arranged in the center of the top surface of the third dielectric substrate 3; the centers of the first dielectric substrate 1, the second dielectric substrate 2 and the third dielectric substrate 3 are arranged in a collinear manner, and the second dielectric substrate 2 and the third dielectric substrate 3 are all dielectric substrates with circular structures.
Principle of operation
The working principle of the dual-frequency dual-circular polarization common-caliber antenna is as follows:
when electromagnetic signals are input from a low-frequency end, energy passes through a first band-pass filtering structure, the first band-pass filtering structure is a band-pass filtering structure formed by two opposite split rings, signals at 4 branches are enabled to be equal in amplitude and have 90-degree phase difference in sequence in a sequential feeding mode, and the signals are coupled to an upper-layer metal radiator, namely a low-frequency radiation unit through an L-shaped gap of a middle floor layer to radiate circularly polarized signals; when signals are input from a high-frequency end, energy passes through a second band-pass filtering structure, the principle of the second band-pass filtering structure is similar to the working principle of the first band-pass filtering structure, then the energy is coupled with a Y-shaped gap of a middle floor layer through a section of coupling line, and finally the energy is radiated through an upper layer circular patch, namely a high-frequency radiation unit; the superposed structural characteristics of the two Y-shaped gaps enable the upper-layer radiator to generate circularly polarized signals; in the invention, the two groups of band-pass filtering structures can effectively improve the isolation between the low-frequency port and the high-frequency port, and the impedance bandwidth and the axial ratio bandwidth of the antenna are improved by the coupling of the middle gap layer.
According to the dual-frequency dual-circular polarization common-aperture antenna, the band-pass filtering structures are respectively arranged in the low-frequency port feed network structure and the high-frequency port feed network structure, and the two band-pass filtering structures are introduced to achieve high port isolation; the low-frequency or high-frequency port feed network structure is connected with the low-frequency or high-frequency radiating unit through the gap coupling structure, and the impedance and the axial ratio bandwidth of the antenna are improved by introducing the gap coupling structure; the high-frequency and low-frequency radiating units are designed in a layered mode, so that the overall size of the antenna is reduced; the antenna has simple integral design and light weight, and can be applied to various satellite communication devices.
Examples
As shown in fig. 1-6, the present embodiment provides a dual-band dual-circular-polarization common-aperture antenna for satellite communication, which includes a first dielectric substrate 1, a second dielectric substrate 2, and a third dielectric substrate 3; the first dielectric substrate 1, the second dielectric substrate 2 and the third dielectric substrate 3 are sequentially stacked from bottom to top; a feed network structure is printed below the first dielectric substrate 1, and a metal ground 12 is printed above the first dielectric substrate; the low-frequency radiation unit 21 is printed on the second dielectric substrate 2, and the high-frequency radiation unit 31 is printed on the third dielectric substrate.
In this embodiment, the feed network structure printed under the first dielectric substrate includes a low frequency port feed network structure and a high frequency port feed network structure; the low-frequency port feed network structure comprises a first feed line 111, a first band-pass filtering structure 112 and a second feed line 113; one end of the first feeder line 111 is connected with the low-frequency port, the other end of the first feeder line is connected with one end of the first band-pass filtering structure 112, and the other end of the first band-pass filtering structure 112 is connected with the second feeder line 113; the first bandpass filtering structure 112 includes two first open rings symmetrically arranged, and open ends of the two first open rings are arranged oppositely; one end of one of the first split rings is connected with the first feeder line 111, the other end of the one of the first split rings is arranged at an interval with one end of the other first split ring, and the other end of the other first split ring is connected with the third feeder line 114; wherein, two split rings are split ring resonators.
The third feeder 114 is used for sequential feeding, and the third feeder 114 includes a ring feeder and four L-shaped feeders; the annular feeder is arranged in the center of the first dielectric substrate 1, the annular feeder is of an open ring structure, the four L-shaped feeders are uniformly arranged in the circumferential direction of the annular feeder, and the four L-shaped feeders are respectively connected with the annular feeder.
The high-frequency port feeder network structure comprises a third feeder 114, a second band-pass filter structure 115 and a coupling feeder 116; one end of the third feeder line 114 is connected to the high frequency port, and the other end is connected to the second band-pass filter structure 115; the second band-pass filtering structure 115 comprises two second split rings which are symmetrically arranged, and the open ends of the two second split rings are oppositely arranged; one end of one of the second split rings is connected to the third feed line 114, and the other end is spaced from one end of the other second split ring; the coupling feed line 116 is arranged at the center of the first dielectric substrate 1, and the coupling feed line 116 is connected with the other end of the other second split ring through an air bridge structure.
The air bridge structure is arranged at the intersection point of the high-frequency port feeder network structure and the low-frequency port feeder network structure and is positioned on the first dielectric substrate 1; by introducing the air bridge structure, the crossing between the annular feeder line and the coupling feeder line is effectively avoided; in this embodiment, the metal through holes are disposed at the corresponding positions of the metal ground above the first dielectric substrate, the fourth feeding line is disposed between the two metal through holes, and the fourth feeding line is used to connect the coupling feeding line and the split ring, thereby avoiding the crossing of the high-frequency port and the low-frequency port feeding network structures.
In this embodiment, the air bridge structure includes a first metal via 117, a second metal via 118, and a fourth feed line 122; the first metal through hole 117 and the second metal through hole 118 vertically penetrate through the first dielectric substrate 1 and are respectively located at two sides of the annular feeder line; the fourth feed line 122 is disposed on the top surface of the first dielectric substrate 1 and between the first metal via 117 and the second metal via 118; one end of the first metal via 117 is connected to the second band-pass filter structure 115, the other end is connected to one end of the second metal via 118 through the fourth feeding line 122, and the other end of the second metal via 118 is connected to the coupling feeding line 116.
In this embodiment, four L-shaped gaps 121 are disposed on the metal ground 12, and the four L-shaped gaps 121 are uniformly distributed in a ring shape; the long edge of the L-shaped slot 121 is arc-shaped and is arranged opposite to the annular feeder line; the short sides of the L-shaped slits 121 are arranged at the ends of the long sides and extend toward the center of the metal ground 12; two Y-shaped gaps 123 are also arranged on the metal ground 12; the two Y-shaped gaps 123 are symmetrically arranged at the center of the first dielectric substrate 1, one ends of the two Y-shaped gaps 123 are connected, and the other ends of the two Y-shaped gaps 123 are uniformly dispersed along the circumferential direction; four L-shaped gaps are arranged to serve as coupling gaps corresponding to the low-frequency port feed network; the two Y-shaped gaps are overlapped to form a coupling gap with the high-frequency port feed network structure.
In the present embodiment, the low frequency radiation unit 21 is printed above the second dielectric substrate 2; the middle of the second medium substrate 2 is hollowed, namely an air cavity is arranged below the third medium substrate 3; the high-frequency radiation unit 31 is printed above the third dielectric substrate 3.
The dual-frequency dual-circular-polarization common-aperture antenna is manufactured on a Rogers RT5880 dielectric substrate with the dielectric constant of 2.2 by adopting a printed circuit board process, the thickness of the first dielectric substrate and the thickness of the third dielectric substrate are 0.2mm, the thickness of the second dielectric substrate is 0.6mm, the width of a microstrip feeder line is 0.5mm, the width of a high-frequency gap is 0.1mm, the width of a low-frequency gap is 0.2mm, the radius of a circular patch is 2mm, the inner diameter of a low-frequency circular ring is 4.8mm, and the outer diameter of the low-frequency circular ring is 5.5 mm.
As shown in fig. 7, a simulation result of return loss and isolation of a high-frequency port and a low-frequency port of a dual-frequency dual circularly polarized antenna is shown in fig. 7; as can be seen from fig. 6, the frequency range of 10dB return loss of the antenna at the low frequency band is 18.81GHz to 21.33 GHz, the relative bandwidth is 12.6%, the frequency range of 10dB return loss at the high frequency band is 28.65GHz to 31.26GHz, and the relative bandwidth is 8.7%; s12 represents isolation between different frequency bands, all less than-30 dB across the frequency band.
As shown in fig. 8 and 9, fig. 8 shows a simulation structure diagram of the antenna gain varying with frequency, and fig. 9 shows a simulation result diagram of the antenna axial ratio varying with frequency; as can be seen from fig. 8, in the gain curve, the gains of the antenna in the low frequency band are all above 5dB, and the gains in the high frequency band are all above 7.5 dB; as can be seen from fig. 9, in the axial ratio curve, the 3dB normal axial ratio frequency range of the antenna at the low frequency band is 19.25GHz to 21.83GHz, and the relative bandwidth is 12.9%; the 3dB normal axial ratio frequency range of the antenna in a high frequency band is 28.74GHz to 32.96GHz, and the relative bandwidth is 14%; the antenna obtains stable gain and wider axial ratio bandwidth in two frequency bands.
The invention relates to a dual-frequency dual-circular-polarization common-caliber antenna, which comprises a feed network structure printed below a first dielectric substrate, a metal ground printed above the first dielectric substrate, a second dielectric substrate, a low-frequency radiation unit printed above the second dielectric substrate, a third dielectric substrate and a high-frequency radiation unit printed above the third dielectric substrate; the isolation of a higher port is realized through the two groups of open resonator ring structures, and the wider impedance and the axial ratio bandwidth are realized through introducing a gap structure; meanwhile, the method has the characteristics of low profile and realization of circularly polarized radiation.
The feed network below the first dielectric substrate comprises a high-frequency feed network and a low-frequency feed network, the high-frequency feed network comprises a band-pass filtering structure consisting of split resonant rings, and a sequential feed structure consisting of 3/4 rings realizes circular polarization radiation feed; the low-frequency part comprises a band-pass filtering structure consisting of an open resonant ring, a coupling line for realizing impedance matching and other feeder lines.
Two Y-shaped superposed gaps are formed in the center of a metal floor printed above a first dielectric substrate and used for feeding coupling of high-frequency circularly polarized radiation, and four groups of L-shaped gaps are formed in positions corresponding to a low-frequency feeding network and used for coupling of a low-frequency part.
Because the two groups of high-frequency and low-frequency feed networks have a crossing condition, a back metal at the crossing position is slotted, an air bridge is built, and the crossing of the two groups of feed lines on the same layer is avoided; a cylindrical air cavity is dug in the center of the second medium substrate and used for improving the gain and bandwidth of high frequency; the position of the low-frequency radiation unit printed above the second dielectric substrate corresponds to the position of a low-frequency gap on the metal floor, so that gap coupling microstrip radiation is realized.
The above-described embodiment is only one of the embodiments that can implement the technical solution of the present invention, and the scope of the present invention to be claimed is not limited to the embodiment, but includes any changes, substitutions and other embodiments that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed.
Claims (7)
1. A dual-frequency dual-circular-polarization common-aperture antenna for satellite communication is characterized by comprising a first dielectric substrate (1), a second dielectric substrate (2) and a third dielectric substrate (3) which are sequentially stacked from bottom to top; a feed network structure is arranged on the bottom surface of the first dielectric substrate (1), and a metal ground (12) is arranged on the top surface; a low-frequency radiation unit (21) is arranged on the top surface of the second dielectric substrate (2); a high-frequency radiation unit (31) is arranged on the top surface of the third dielectric substrate (3);
the feed network structure comprises a low-frequency port feed network structure and a high-frequency port feed network structure, and band-pass filtering structures are respectively arranged in the low-frequency port feed network structure and the high-frequency port feed network structure; the low-frequency port feed network structure is connected with the low-frequency radiating unit (21) through a gap coupling structure, and the high-frequency port feed network structure is connected with the high-frequency radiating unit (31) through the gap coupling structure;
the low-frequency port feed network structure comprises a first feed line (111), a first band-pass filtering structure (112) and a second feed line (113), one end of the first feed line (111) is connected with the low-frequency port, the other end of the first feed line is connected with one end of the first band-pass filtering structure (112), and the other end of the first band-pass filtering structure (112) is connected with the second feed line (113);
the first band-pass filtering structure (112) comprises two first open rings which are symmetrically arranged, and the open ends of the two first open rings are arranged oppositely; one end of one of the first split rings is connected with the first feeder line (111), the other end of the first split ring is arranged at an interval with one end of the other first split ring, and the other end of the other first split ring is connected with the second feeder line (113);
the second feeder (113) comprises an annular feeder and four L-shaped feeders, the annular feeder is arranged in the center of the first dielectric substrate (1), the annular feeder is of an open ring structure, the four L-shaped feeders are uniformly arranged in the circumferential direction of the annular feeder, and the four L-shaped feeders are respectively connected with the annular feeder;
the high-frequency port feed network structure comprises a third feed line (114), a second band-pass filtering structure (115) and a coupling feed line (116);
one end of a third feeder line (114) is connected with the high-frequency port, and the other end of the third feeder line is connected with a second band-pass filtering structure (115);
the second band-pass filtering structure (115) comprises two second split rings which are symmetrically arranged, and the open ends of the two second split rings are oppositely arranged; one end of one second split ring is connected with the third feeder line (114), and the other end of the second split ring is arranged at an interval with one end of the other second split ring;
the coupling feeder line (116) is arranged in the center of the first dielectric substrate (1), and the coupling feeder line (116) is connected with the other end of the other second split ring through an air bridge structure;
the high-frequency radiation unit (31) is a circular radiator;
the low-frequency radiation unit (21) comprises four arc-shaped radiators which are uniformly distributed in a ring shape;
two Y-shaped gaps (123) are also arranged on the metal ground (12); two Y type gaps (123) are symmetrically arranged at the center of the first medium substrate (1), one ends of the two Y type gaps (123) are connected, and the other ends of the two Y type gaps are uniformly dispersed along the circumferential direction.
2. The dual-band dual-circular-polarization common-aperture antenna for satellite communication according to claim 1, wherein four L-shaped slots (121) are arranged on the metal ground (12); the four L-shaped gaps (121) are uniformly distributed in an annular shape, and the long edges of the L-shaped gaps (121) are arc-shaped and are arranged opposite to the annular feeder line; the short side of the L-shaped slit (121) is arranged at the end of the long side and extends towards the center of the metal ground (12).
3. The dual-band dual-circular-polarization common aperture antenna for satellite communication according to claim 2, wherein the four arc-shaped low-frequency radiators are disposed opposite to the L-shaped slot (121) on the metal ground (12).
4. The dual-band dual-circular-polarization common-aperture antenna for satellite communication according to claim 1, wherein the air bridge structure is arranged at the intersection of the high-frequency port feed network structure and the low-frequency port feed network structure; the air bridge structure comprises a first metal through hole (117), a second metal through hole (118) and a fourth feed line (122);
the first metal through hole (117) and the second metal through hole (118) vertically penetrate through the first dielectric substrate (1) and are respectively positioned on two sides of the annular feeder line; the fourth feeder line (122) is arranged on the top surface of the first dielectric substrate (1) and is positioned between the first metal through hole (117) and the second metal through hole (118); one end of the first metal through hole (117) is connected with the second band-pass filtering structure (115), the other end of the first metal through hole is connected with one end of the second metal through hole (118) through a fourth feed line (122), and the other end of the second metal through hole (118) is connected with the coupling feed line (116).
5. The dual-band dual-circular-polarization common-aperture antenna for satellite communication according to claim 1, wherein the center of the second dielectric substrate (2) is provided with a circular through hole, and the circular through hole is opposite to the center of the third dielectric substrate (3).
6. A dual-band dual-circular-polarization common aperture antenna for satellite communication according to claim 1, wherein the circular radiator is disposed at the center of the third dielectric substrate (3).
7. The dual-band dual-circular-polarization common-aperture antenna for satellite communication according to claim 1, wherein centers of the first dielectric substrate (1), the second dielectric substrate (2) and the third dielectric substrate (3) are arranged in a collinear manner, and the second dielectric substrate (2) and the third dielectric substrate (3) are dielectric substrates with circular structures.
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| CN114824777B (en) * | 2022-05-24 | 2023-06-23 | 西安交通大学 | Arc-shaped circuit of mirror surface single cone antenna |
| CN115425386B (en) * | 2022-11-03 | 2023-03-24 | 微网优联科技(成都)有限公司 | Common-caliber antenna array of SRR loaded dual-polarized antenna |
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