Dual-frequency common-aperture array antenna with frequency band isolation function

Abstract

The invention discloses a dual-frequency common-aperture array antenna with a frequency band isolation function, which comprises a back frame and a reflecting plate fixed on the back frame, and is characterized in that the reflecting plate is provided with a plurality of through holes; four V-section unit antennas in a rectangular array are installed on the reflecting plate at intervals, four U-section unit antennas in a linear array are installed on the reflecting plate at intervals, and the four U-section unit antennas are located in an area defined by the four V-section unit antennas; a V-section cavity one-quarter power divider electrically connected with the four V-section unit antennas respectively and a U-section cavity one-quarter power divider electrically connected with the four U-section unit antennas respectively are mounted on the back frame; a duplexer is mounted on the back frame, and the V-section cavity one-to-four power divider and the U-section cavity one-to-four power divider are electrically connected with the duplexer; the top of the back frame is provided with at least two lightning rods at intervals. The problems that when a U-section unit antenna and a V-section unit antenna are integrated on a reflecting plate with a limited area, structural conflicts are possibly formed, and frequency band isolation is difficult to meet are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, and in particular to a dual-band common-aperture array antenna with frequency band isolation function. Background Art

[0002] With the rapid development of communication technologies, components in communication systems tend to be integrated and have high performance, which is also the case in base station antenna arrays. In recent years, with the development of mobile communication, base station antennas need to cover more frequency bands. However, since previous base stations have been placed in favorable positions, new base stations cannot be arranged in the best positions. Therefore, new antennas need to be placed on the same reflector together with previous-generation antennas. One placement method is to place antennas of different frequency bands on their respective reflectors and then place them side by side and combine them to form a large reflector. Although the distance between antennas of different frequency bands is relatively far and the mutual influence is small in this way, it will lead to a relatively large overall size of the antenna, bringing problems of high erection difficulty and high cost. And placing antennas of different frequency bands with a common aperture on the same reflector is a very efficient way to utilize space. However, since the size of the antenna operating in the high-frequency band is small during actual placement and generally needs to be placed below the antenna with a lower operating frequency band, when the high-frequency antenna unit below works, induced current will be generated on the low-frequency oscillator placed above. The scattering effect caused by the superposition of the secondary radiation of the induced current and the original radiation of the high-frequency unit will cause the pattern distortion of the high-frequency unit. Or rather, the low-frequency antenna above will have an "obstruction" effect on the high-frequency unit below, and the interference received by the radiation of the high-frequency antenna below will further affect the communication quality of this frequency band.

[0003] Common integration of antennas of two different frequency bands mainly includes U-band (225 MHz - 512 MHz) unit antennas and V-band (108 MHz - 174 MHz) unit antennas. When integrating antennas of two frequency bands, it is necessary to consider solving structural conflicts and frequency band isolation problems within a limited area. Summary of the Invention

[0004] The purpose of the present invention is to provide a dual-band common-aperture array antenna with frequency band isolation function to solve the problems that structural conflicts may be formed and it is difficult to meet frequency band isolation when integrating U-band unit antennas and V-band unit antennas on a reflector with a limited area.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A dual - frequency common - aperture array antenna with frequency - band isolation function, comprising a back frame and a reflector fixed on the back frame. A number of through - holes in a rectangular array are formed on the reflector; Four V - band unit antennas in a rectangular array are spaced and installed on the reflector, and four U - band unit antennas in a linear array are spaced and installed on the reflector. The four U - band unit antennas are located in the area enclosed by the four V - band unit antennas; A V - band cavity quarter - power divider electrically connected to the four V - band unit antennas respectively, and a U - band cavity quarter - power divider electrically connected to the four U - band unit antennas respectively are installed on the back frame; A duplexer is installed on the back frame, and the V - band cavity quarter - power divider, the U - band cavity quarter - power divider and the duplexer are electrically connected; At least two lightning rods are spaced and installed on the top of the back frame.

[0006] Preferably, the V - band unit antenna includes four first support columns symmetrically installed in pairs on the reflector. A tuning oscillator is installed on the first support column. A positioning and fixing block is installed between the tuning oscillator and the reflector. A stepped - folded feed network oscillator is installed on the positioning and fixing block. The stepped - folded feed network oscillator includes a first bending part and a second bending part; A second support column is installed between the reflector and the tuning oscillator. The first bending part is sleeved on the second support column. A first connector socket is installed on the reflector. The second bending part is connected to the first connector socket, and the first connector socket is electrically connected to the V - band cavity quarter - power divider.

[0007] Preferably, a first connection pin is fixed on the second bending part. The first connection pin is threadedly connected to the inner conductor of the first connector socket, and a first insulating sleeve is sleeved on the first connection pin.

[0008] Preferably, a number of air - guiding holes are formed on the tuning oscillator, which avoid the stepped - folded feed network oscillator and are arranged in an array.

[0009] Preferably, the U-band unit antenna includes four third support columns symmetrically installed in pairs on the reflector. A fixing plate is installed on the third support columns. An electric dipole oscillator and a magnetic dipole oscillator are installed at intervals on the fixing plate and are arranged oppositely. The electric dipole oscillator and the magnetic dipole oscillator are connected to the reflector. A first dielectric module and a second dielectric module are installed on the electric dipole oscillator. A third dielectric module and two low-loss dielectric modules arranged at intervals are installed on the magnetic dipole oscillator. It further includes a conductor installed on the fixing plate. One end of the conductor is sequentially embedded in the first dielectric module and the second dielectric module. A first pressing block for pressing the end of the conductor is provided on the second dielectric module. The other end of the conductor is sequentially embedded in the third dielectric module and the two low-loss dielectric modules. Second pressing blocks for pressing the ends of the conductor are provided on the two low-loss dielectric modules. A second connector socket for connecting the magnetic dipole oscillator is installed on the reflector. The second connector socket is electrically connected to the U-band cavity quarter-wave power divider.

[0010] Preferably, the electric dipole oscillator includes a first horizontal plate, a first bending plate, and a first vertical plate formed by integrally bending. The first horizontal plate is fixed on the fixing plate, and the first vertical plate is fixed on the reflector. The first dielectric module is installed on the first bending plate, and the second dielectric module (7) is installed on the first vertical plate.

[0011] Preferably, the magnetic dipole oscillator includes a second horizontal plate, a second bending plate, and a second vertical plate formed by integrally bending. The second horizontal plate is fixed on the fixing plate, and the first vertical plate is fixed on the reflector. The third dielectric module is installed on the second bending plate, and the two low-loss dielectric modules are installed at intervals on the second vertical plate.

[0012] Preferably, a second connection pin and a second insulating sleeve sleeved on the connection pin are fixedly connected to the magnetic dipole oscillator. The connection pin is connected to the inner core of the second connector socket.

[0013] Preferably, the back frame includes a frame structure. A first vertical rod, a second vertical rod and a third vertical rod located on both sides of the first vertical rod are fixed in the middle of the frame structure. A first cross rod and a second cross rod are fixed on the frame structure. Side frames are provided on both sides of the frame structure. The heights of the two side frames gradually decrease from bottom to top. A third cross rod, a fourth cross rod and a fifth cross rod are sequentially fixed on the two side frames. A first pull rod is connected between the first end of the third cross rod and the second end of the fourth cross rod. A second pull rod is connected between the second end of the third cross rod and the first end of the fourth cross rod. Both the first pull rod and the second pull rod are fixedly connected to the fifth cross rod. Third pull rods are connected between the first end and the second end of the third cross rod and the top end of the first vertical rod. A fourth pull rod is connected between the first end of the third cross rod and the top end of the second vertical rod. A fifth pull rod is connected between the second end of the third cross rod and the top end of the third vertical rod.

[0014] Preferably, the side frame includes a first support rod fixed to the bottom of the frame structure and a second support rod fixed to the top of the frame structure. The length of the first support rod is greater than that of the second support rod. Diagonal rods are fixed on the first support rod and the second support rod. A plurality of third support rods with gradually decreasing heights are fixed between the diagonal rods and the frame structure. A plurality of reinforcing rods for forming a triangular connection are connected between the ends of the first support rod, the second support rod and the third support rods.

[0015] Beneficial effects: By installing 4 V-band unit antennas in a rectangular array at intervals on the reflector and linearly arranging 4 U-band unit antennas in the area enclosed by the 4 V-band unit antennas, the two-band antennas are arranged at intervals to avoid structural conflicts, and the high-frequency band antennas are arranged inside the low-frequency band antennas, which can avoid mutual interference. After optimizing the array layout and feeding phase, it is ensured to meet the consistent radiation characteristics at different frequency bands; At the same time, by arranging a number of through holes in an array on the reflector to form a frequency selective surface, further frequency band isolation is realized, and the risk of mutual interference is reduced; There are many antennas in different frequency bands. The cavity quarter power divider is respectively connected and then connected to the duplexer to realize stable connection with external devices; And a lightning rod is integrated on the top of the back frame to realize lightning protection and protect the antenna. Description of the drawings

[0016] Figure 1 It is a three-dimensional structure schematic diagram of an embodiment of the present invention; Figure 2 It is a rear view structure schematic diagram of an embodiment of the present invention; Figure 3 It is a side view structure schematic diagram of an embodiment of the present invention; Figure 4 is Figure 1 the partial enlarged structural schematic diagram at position A in Figure 5 the structural schematic diagram of the V - section unit antenna in the embodiment of the present invention; Figure 6 the structural schematic diagram of the U - section unit antenna pair in the embodiment of the present invention; In Figures 1 to 6 the corresponding relationship between the component names or lines and the drawing numbers is: Back frame 1, frame structure 10, first vertical rod 11, second vertical rod 12, third vertical rod 13, first cross rod 14, second cross rod 15, side frame 16, first support rod 161, second support rod 162, diagonal rod 163, third support rod 164, strengthening rod 165, third cross rod 17, fourth cross rod 18, fifth cross rod 19, first pull rod 110, second pull rod 111, third pull rod 112, fourth pull rod 115, fifth pull rod 116, reflector 2, through hole 20, V - section unit antenna 3, first support column 31, tuning oscillator 32, positioning and fixing block 33, stepped folding feed network oscillator 34, first bending part 35, second bending part 36, second support column 37, first connector socket 38, first connection pin 39, first insulating sleeve 310, air guide hole 311, U - section unit antenna 4, third support column 41, fixing plate 42, electric dipole oscillator 43, first horizontal plate 431, first bending plate 432, first vertical plate 433, magnetic dipole oscillator 44, second horizontal plate 441, second bending plate 442, second vertical plate 443, first dielectric module 45, second dielectric module 46, first pressing block 47, third dielectric module 48, second pressing block 49, second connector socket 410, second connection pin 411, second insulating sleeve 412, V - section cavity quarter - power divider 5, U - section cavity quarter - power divider 6, duplexer 7, lightning rod 8. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0018] See Figures 1 - 6As shown in the figure, in an embodiment of the present invention, a dual - frequency common - aperture array antenna with frequency - band isolation function is proposed, which includes a back - frame 1 and a reflector 2 fixed on the back - frame 1. A number of through - holes 20 arranged in a rectangular array are formed on the reflector 2. The installation flatness of the reflector 2 is realized through the back - frame 1, and at the same time, a number of through - holes 20 are formed on the reflector 2 to form a frequency - selective surface, so as to effectively avoid frequency - band isolation between antennas of different frequency bands. Specifically, 4 V - band unit antennas 3 arranged in a rectangular array are installed on the reflector 2 at intervals, and 4 U - band unit antennas 4 arranged in a linear array are installed on the reflector 2 at intervals. The 4 U - band unit antennas 4 are located in the area enclosed by the 4 V - band unit antennas 3. By optimizing the array layout and feeding phase, it is ensured that the U - band unit antennas 4 and the V - band unit antennas 3 have consistent radiation characteristics in different frequency bands. And by enclosing an inner - empty area with the 4 V - band unit antennas 3 and linearly arranging the 4 U - band unit antennas 4 in the area, it can avoid structural conflicts in terms of the integrated structure, and is convenient for integrating two - frequency - band antennas within a limited area, which is beneficial to reducing the overall volume.

[0019] Since the number of integrated U - band unit antennas 4 and V - band unit antennas 3 is large, unified communication is required. Specifically, a V - band cavity quarter - power divider 5 electrically connected to the 4 V - band unit antennas 3 respectively and a U - band cavity quarter - power divider 6 electrically connected to the 4 U - band unit antennas 4 respectively are installed on the back - frame 1; a duplexer 7 is installed on the back - frame 1. The V - band cavity quarter - power divider 5, the U - band cavity quarter - power divider 6 and the duplexer 7 are electrically connected. Through a V - band cavity quarter - power divider 5, the 4 V - band unit antennas 3 are communicatively connected, and through a U - band cavity quarter - power divider 6, the 4 U - band unit antennas 4 are communicatively connected. After realizing the aggregated connection, communication with external devices is realized through a duplexer 7. Thereby, the number of used devices can be reduced and the failure probability can be lowered.

[0020] Since the entire antenna is used in an outdoor scenario, lightning protection needs to be considered. At least two lightning rods 8 are installed on the top of the back - frame 1 at intervals to ensure the safety of the entire antenna during use.

[0021] Specifically, the V - band unit antenna 3 includes 4 first support columns 31 symmetrically installed in pairs on the reflector 2. A tuning oscillator 32 is installed on the first support columns 31. By satisfying the interval distance, effective impedance matching is ensured. The reflector 2 is located below the tuning oscillator 32, which can weaken the backward radiation energy of the tuning oscillator 32, so that the entire antenna has a directional radiation characteristic. A frame structure 10 is formed by the tuning oscillator 32, the first support columns 31 and the reflector 2, which can have good wind - resistance performance.

[0022] Meanwhile, a positioning and fixing block 33 is installed between the tuning oscillator 32 and the reflector 2. A stepped folded feed network oscillator 34 is installed on the positioning and fixing block 33. The stepped folded feed network oscillator 34 includes a first bending portion 35 and a second bending portion 36. An insulatingly connected second support column 37 is further provided on the tuning oscillator 32. The second support column 37 is installed on the reflector 2. The first bending portion 35 is sleeved on the second support column 37. The first bending portion 35 is spaced apart from the tuning oscillator 32, and air medium is in the middle. A first connector socket 38 is installed on the reflector 2. The second bending portion 36 is connected to the first connector socket 38. The connector socket is used for plugging in an external wire. After the current passes through the stepped folded feed network oscillator 34 and is coupled to the tuning oscillator 32 through the air medium, it radiates outward, increasing the radiation efficiency, improving the gain, and reducing the voltage standing wave ratio.

[0023] The mechanical performance of the entire antenna structure is increased, enabling it to be adapted to outdoor scenarios. And based on good structural strength, it can carry a high power of 400W.

[0024] Among them, the first connector socket 38 is electrically connected to the V-band cavity quarter-power divider 5, so that multiple V-band unit antennas 3 are all connected to a V-band cavity quarter-power divider 5.

[0025] Meanwhile, the second bending portion 36 and the first connector socket 38 need to have good conductivity and be insulated from the reflector 2 at the same time. A first connection pin 39 is fixed on the second bending portion 36. The first connection pin 39 is threadedly connected to the inner conductor of the first connector socket 38. A first insulating sleeve 310 is sleeved on the first connection pin 39. The first insulating sleeve 310 realizes the insulating connection between the first connection pin 39 and the reflector 2 and ensures a stable connection with the inner conductor of the first connector socket 38, thus having good conductive performance.

[0026] Meanwhile, a plurality of air guide holes 311 which avoid the stepped folded feed network oscillator 34 and are arranged in an array are formed on the tuning oscillator 32. When used outdoors, the wind resistance on the tuning oscillator 32 is reduced.

[0027] Specifically, the U-band unit antenna 4 includes four third support columns 41 symmetrically installed in pairs on the reflector 2. A fixing plate 42 is installed on the third support columns 41. The fixing plate 42 is spaced from the reflector 2 through the third support columns 41, and the middle is an air medium. At the same time, an electric dipole oscillator 43 and a magnetic dipole oscillator 44 are installed at intervals on the fixing plate 42 and are arranged opposite to each other. The electric dipole oscillator 43 and the magnetic dipole oscillator 44 are connected to the reflector 2. Among them, a first dielectric module 45 and a second dielectric module 46 are installed on the electric dipole oscillator 43. A third dielectric module 48 and two low-loss dielectric modules arranged at intervals are installed on the magnetic dipole oscillator 44. A conductor installed on the fixing plate 42 is also included. One end of the conductor is sequentially embedded in the first dielectric module 45 and the second dielectric module 46, and a first pressing block 47 for pressing the end of the conductor is provided on the second dielectric module 46. The other end of the conductor is sequentially embedded in the third dielectric module 48 and the two low-loss dielectric modules, and a second pressing block 49 for pressing the end of the conductor is provided on the two low-loss dielectric modules. Thus, reliable installation and fixation of the magnetic dipole oscillator 44 and the electric dipole oscillator 43 are achieved, the internal signal conduction conductor is arranged, and relative isolation between the magnetic dipole oscillator 44 and the electric dipole oscillator 43 is satisfied. A second connector socket 410 connecting the magnetic dipole oscillator 44 is installed on the reflector 2. The second connector socket 410 is electrically connected to the U-band cavity quarter-power divider 6. The second connection sockets in the 4 U-band unit antennas 4 are connected through one U-band cavity quarter-power divider 6.

[0028] The magnetoelectric dipole can achieve strong coupling of the electric field and the magnetic field through structural design, thereby generating efficient electromagnetic radiation at a specific frequency. The magnetoelectric dipole combines the characteristics of the electric dipole and the magnetic dipole and can generate radiation of both the electric field and the magnetic field at the same time. In addition, a feeder is integrated on the magnetic dipole oscillator 44 to achieve excitation. The magnetic dipole oscillator 44 and the electric dipole oscillator 43 are integrated simultaneously in a way of simplifying the structure, meeting the low-profile requirement and being able to have the effect of wind resistance outdoors.

[0029] Specifically, the electric dipole oscillator 43 includes a first horizontal plate 431, a first bending plate 432, and a first vertical plate 433 integrally bent and formed. The first horizontal plate 431 is fixed on the fixing plate 42, and the first vertical plate 433 is fixed on the reflector 2. The first dielectric module 45 is installed on the first bending plate 432, and the second dielectric module 46 is installed on the first vertical plate 433. The entire electric dipole oscillator 43 is an integrally formed structure. The contact surface between the oscillator and the air medium is realized through bending, and the extension length of the electric dipole oscillator 43 is increased when the spacing distance between the fixing plate 42 and the reflector 2 is fixed.

[0030] Specifically, the magnetic dipole oscillator 44 includes a second horizontal plate 441, a second bending plate 442, and a second vertical plate 443 that are integrally bent. The second horizontal plate 441 is fixed on the fixed plate 42, and the first vertical plate 433 is fixed on the reflector 2. The third dielectric module 48 is installed on the second bending plate 442, and the two low-loss dielectric modules are installed on the second vertical plate 443 at intervals. The two low-loss dielectric modules are installed on the second vertical plate 443 at intervals, which also increases the contact surface between the magnetic dipole oscillator 44 and the air dielectric. Additionally, the spacing distance between the first bending plate 432 and the second bending plate 442 can determine the spacing distance between the entire electric dipole oscillator 43 and the magnetic dipole oscillator 44.

[0031] Specifically, a second connection pin 411 is fixedly connected to the magnetic dipole oscillator 44, and a second insulating sleeve 412 is sleeved on the second connection pin 411. The second connection pin 411 is connected to the inner core of the second connector socket 410, and the second connection pin 411 is connected to the feeder line of the magnetic dipole oscillator 44.

[0032] To ensure the stability of the entire antenna when installed on the ground outdoors, it is achieved by enhancing the stable support of the back frame 1. Specifically, the back frame 1 includes a frame structure 10. A first vertical rod 11 is fixed in the middle of the frame structure 10, and second vertical rods 12 and third vertical rods 13 are located on both sides of the first vertical rod 11. A first cross rod 14 and a second cross rod 15 are fixed on the frame structure 10. The stability of the frame structure 10 is enhanced through the first vertical rod 11, the second vertical rod 12, the third vertical rod 13, the first cross rod 14, and the second cross rod 15, while ensuring the flatness of the fixed installation of the reflector 2. At the same time, side frames 16 are provided on both sides of the frame structure 10. The heights of the two side frames 16 gradually decrease from bottom to top. A third cross rod 17, a fourth cross rod 18, and a fifth cross rod 19 are sequentially fixed on the two side frames 16. Among them, a first pull rod 110 is connected between the first end of the third cross rod 17 and the second end of the fourth cross rod 18, and a second pull rod 111 is connected between the second end of the third cross rod 17 and the first end of the fourth cross rod 18. Both the first pull rod 110 and the second pull rod 111 are fixedly connected to the fifth cross rod 19; and third pull rods 112 are connected between the first end and the second end of the third cross rod 17 and the top end of the first vertical rod 11. A fourth pull rod 115 is connected between the first end of the third cross rod 17 and the top end of the second vertical rod 12, and a fifth pull rod 116 is connected between the second end of the third cross rod 17 and the top end of the third vertical rod 13; thus, the structural stability between the side frames 16 on both sides and the frame structure 10 is achieved through the first pull rod 110, the second pull rod 111, the third pull rod 112, the fourth pull rod 115, and the fifth pull rod 116, forming multiple triangular connection structures, and enabling the side frames 16 and the frame structure 10 to form a triangular support structure, ensuring that the entire antenna is more stable after being installed on the ground and can avoid the influence of outdoor environmental factors, mainly considering the influence of wind force.

[0033] Specifically, the structure of the side frame 16 also needs to have good strength and be able to bear the load. Specifically, the side frame 16 includes a first support rod 161 fixed to the bottom of the frame structure 10 and a second support rod 162 fixed to the top of the frame structure 10. The length of the first support rod 161 is greater than that of the second support rod 162. Diagonal rods 163 are fixed on the first support rod 161 and the second support rod 162. Multiple third support rods 164 with gradually decreasing heights are fixed between the diagonal rods 163 and the frame structure 10. Multiple reinforcing rods 165 for forming triangular connections are connected between the ends of the first support rod 161, the second support rod 162, and the third support rod 164; by connecting to the frame structure 10 through the first support rod 161, the second support rod 162, and the third support rod 164 along the length direction of the diagonal rod 163 and forming a triangular connection structure through the reinforcing rods 165, the structural strength of the side frame 16 structure is enhanced.

[0034] In the present invention, unless otherwise clearly specified or limited, the terms "installed", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0036] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A dual-frequency common aperture array antenna with frequency band isolation, characterized in that: It comprises a back frame (1) and a reflective plate (2) fixed on the back frame (1), wherein the reflective plate (2) is provided with a plurality of through holes (20) in a rectangular array; Four V-segment unit antennas (3) in a rectangular array are installed at intervals on the reflector (2), and four U-segment unit antennas (4) in a linear array are installed at intervals on the reflector (2), and the four U-segment unit antennas (4) are located in an area enclosed by the four V-segment unit antennas (3); The back frame (1) is provided with a V-segment cavity quarter-power divider (5) electrically connected to the four V-segment unit antennas (3) respectively, and a U-segment cavity quarter-power divider (6) electrically connected to the four U-segment unit antennas (4) respectively; a duplexer (7) is provided on the back frame (1), and the V-segment cavity quarter-power divider (5) and the U-segment cavity quarter-power divider (6) are electrically connected to the duplexer (7); At least two lightning rods (8) are installed at intervals on the top of the back frame (1).

2. The dual-frequency common aperture array antenna with frequency band isolation according to claim 1, characterized in that: The V-segment unit antenna (3) comprises four first support columns (31) symmetrically mounted on the reflector (2) in pairs, a tuning vibrator (32) being mounted on the first support column (31), a positioning and fixing block (33) being mounted between the tuning vibrator (32) and the reflector (2), a step-folded feed network vibrator (34) being mounted on the positioning and fixing block (33), and the step-folded feed network vibrator (34) comprising a first bending portion (35) and a second bending portion (36); A second support column (37) is installed between the reflection plate (2) and the adjustment vibrator (32); the first bent portion (35) is sleeved on the second support column (37); a first connector socket (38) is installed on the reflection plate (2); the second bent portion (36) is connected to the first connector socket (38); and the first connector socket (38) is electrically connected to the V-section cavity quarter power divider (5).

3. The dual-frequency common aperture array antenna with frequency band isolation function according to claim 2, characterized in that: The second bent portion (36) is fixed with a first connecting needle (39), the first connecting needle (39) is threadedly connected to the inner conductor of the first connector socket (38), and the first connecting needle (39) is sleeved with a first insulating sleeve (310).

4. The dual-frequency common aperture array antenna with frequency band isolation function according to claim 3, characterized in that: The adjustment vibrator (32) is provided with a plurality of air guide holes (311) which are arranged in an array and avoid the step-folded feeding network vibrator (34).

5. The dual-frequency common aperture array antenna with frequency band isolation function according to claim 1, characterized in that: The U-segment unit antenna (4) comprises four third support columns (41) symmetrically mounted on the reflector (2) in pairs, a fixing plate (42) being mounted on the third support columns (41), electric dipole oscillators (43) and magnetic dipole oscillators (44) being mounted on the fixing plate (42) at intervals and arranged opposite to each other, and the electric dipole oscillators (43) and magnetic dipole oscillators (44) are connected to the reflector (2); The electric dipole vibrator (43) is mounted with a first dielectric module (45) and a second dielectric module (46); the magnetic dipole vibrator (44) is mounted with a third dielectric module (48) and two low-loss dielectric modules arranged at intervals; the magnetic dipole vibrator (44) further comprises a conductor mounted on the fixing plate (42); one end of the conductor is sequentially embedded in the first dielectric module (45) and the second dielectric module (46); the second dielectric module (46) is provided with a first pressing block (47) for pressing the end of the conductor; the other end of the conductor is sequentially embedded in the third dielectric module (48) and the two low-loss dielectric modules; the two low-loss dielectric modules are provided with a second pressing block (49) for pressing the end of the conductor; A second connector socket (410) connected to the magnetic dipole oscillator (44) is mounted on the reflection plate (2), and the second connector socket (410) is electrically connected to the U-section cavity quarter power divider (6).

6. The dual-frequency common aperture array antenna with frequency band isolation function according to claim 5, characterized in that: The electric dipole oscillator (43) comprises a first horizontal plate (431), a first bent plate (432) and a first vertical plate (433) which are integrally bent, the first horizontal plate (431) being fixed on the fixing plate (42), and the first vertical plate (433) being fixed on the reflecting plate (2); The first medium module (45) is mounted on the first bending plate (432), and the second medium module (46) is mounted on the first vertical plate (433).

7. The dual-frequency common aperture array antenna with frequency band isolation function according to claim 5, characterized in that: The magnetic dipole vibrator (44) comprises a second transverse plate (441) that is bent integrally, a second bent plate (442), and a second vertical plate (443); the second transverse plate (441) is fixed on the fixed plate (42), and the first vertical plate (433) is fixed on the reflecting plate (2); The third dielectric module (48) is mounted on the second bending plate (442), and the two low-loss dielectric modules are mounted on the second vertical plate (443) at intervals.

8. The dual-frequency common aperture array antenna with frequency band isolation function according to claim 7, characterized in that: A second connecting pin (411) and a second insulating sleeve (412) sleeved on the connecting pin are fixedly connected to the magnetic dipole oscillator (44); the connecting pin is connected to the inner core of the second connector socket (410).

9. A dual-frequency co-aperture array antenna with frequency band isolation according to any one of claims 2 to 8, characterized in that: The back frame (1) comprises a frame structure (10), a first vertical rod (11) and a second vertical rod (12) and a third vertical rod (13) located on both sides of the first vertical rod (11) are fixed in the middle of the frame structure (10), and a first cross rod (14) and a second cross rod (15) are fixed on the frame structure (10); Side frames (16) are provided on both sides of the frame structure (10), the heights of the two side frames (16) gradually decrease from bottom to top, and a third crossbar (17), a fourth crossbar (18), and a fifth crossbar (19) are fixed to the two side frames (16) in sequence; A first pull rod (110) is connected to the first end of the third cross bar (17) and the second end of the fourth cross bar (18); a second pull rod (111) is connected to the second end of the third cross bar (17) and the first end of the fourth cross bar (18); and the first pull rod (110) and the second pull rod (111) are both fixedly connected to a fifth cross bar (19); The first end and the second end of the third cross bar (17) are both connected to the top of the first vertical bar (11) via a third pull rod (112); the first end of the third cross bar (17) and the top of the second vertical bar (12) are connected to a fourth pull rod (115); the second end of the third cross bar (17) and the top of the third vertical bar (13) are connected to a fifth pull rod (116).

10. The dual-frequency common aperture array antenna with frequency band isolation function according to claim 9, characterized in that: The side frame (16) comprises a first support rod (161) fixed to the bottom of the frame structure (10), and a second support rod (162) fixed to the top of the frame structure (10); the length of the first support rod (161) is greater than that of the second support rod (162); oblique rods (163) are fixed to the first support rod (161) and the second support rod (162); a plurality of third support rods (164) of successively decreasing heights are fixed between the oblique rod (163) and the frame structure (10); and a plurality of reinforcing rods (165) for forming a triangular connection are connected between the ends of the first support rod (161), the second support rod (162) and the third support rod (164).

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