CN113067133B - Low-profile low-sidelobe large-angle frequency-scanning array antenna - Google Patents
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- CN113067133B CN113067133B CN202110340684.XA CN202110340684A CN113067133B CN 113067133 B CN113067133 B CN 113067133B CN 202110340684 A CN202110340684 A CN 202110340684A CN 113067133 B CN113067133 B CN 113067133B
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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
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- H—ELECTRICITY
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- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
Abstract
The invention discloses a low-profile low-side lobe large-angle frequency scanning array antenna, which comprises a slow wave line feed network, a power dividing network and an antenna radiation unit, wherein the slow wave line feed network, the power dividing network and the antenna radiation unit are formed by multi-branch directional couplers in a serpentine strip line form and are integrated on a multilayer microstrip board in an integrated manner; the invention has the advantages that: the low-profile low-sidelobe large-angle frequency-scanning array antenna is realized.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a low-profile low-sidelobe large-angle frequency-scanning array antenna.
Background
The electric scanning antenna has wide application, and relates to military and civil scenes such as the radar field, the communication field, the monitoring equipment and the like. The electric scanning antenna has the capability of beam pointing and rapid beam shape change, is easy to form a plurality of beams, and can realize signal power synthesis in space. Frequency scanning is a common form of electrical scanning, and compared with phased arrays, it can avoid the use of a large number of T/R components, greatly reducing system complexity, reducing system weight, and reducing processing and design costs. At present, the frequency scanning realized by using slow wave line feeding is the mainstream mode, and the slow wave line has two forms: (1) a waveguide form; (2) in the form of microstrip lines. The slow wave lines in the waveguide form can easily realize amplitude weighting of the array, but are large in size, heavy in weight and not beneficial to system integration, and the application range of the slow wave lines is greatly limited. The microstrip slow wave line not only has light weight and convenient processing, but also can realize integrated processing design with an antenna unit, a power division network and the like. However, in the current research situation, it is difficult to realize a low side lobe design for a microstrip type frequency scanning antenna, which greatly affects the overall performance of the radar, and becomes an important subject of continuous research in the field of antennas.
The document "Frequency scanning chemistry antenna array" (published journal: IEEE trans. antennas and Propagat; published date: 1979; author: Danielesen M, Jorgensen R) firstly proposes a Frequency scanning antenna array in which both the slow wave line and the antenna element are microstrip structures, the antenna realizes scanning of +/-30 degrees in a range of +/-300M, but the side lobe is only-12 dB, and the antenna efficiency is less than 20%.
The document, "design of a frequency-swept antenna of a stripline feed network" (journal: electronic design engineering; release time: 2016; release authors: liu billow, king construction, etc.) proposes a frequency-swept antenna capable of scanning within a range of ± 30 °, wherein a slow wave line and an antenna unit of the antenna all adopt a microstrip form, a secondary lobe can realize-20 dB, but the antenna unit and the slow wave line are connected in a welding manner, and the antenna has a large section, which is greatly limited in engineering processing and use.
At present, most reports adopt waveguide slow wave line design to realize low side lobe, but the waveguide slow wave line design is large in size and heavy in weight, and is not beneficial to system integration, and the microstrip form design frequency scanning antenna is difficult to realize low side lobe.
Disclosure of Invention
The invention aims to solve the technical problem that the low side lobe is realized by designing a frequency-sweeping antenna on a waveguide slow wave line in the prior art, but the waveguide slow wave line is large in size, heavy in weight and not beneficial to system integration, and the low side lobe is difficult to realize by designing the frequency-sweeping antenna in a micro-strip mode.
The invention solves the technical problems through the following technical means: the low-profile low-sidelobe large-angle frequency-scanning array antenna comprises a slow wave line feed network (11), a power distribution network (7) and antenna radiation units, wherein the slow wave line feed network (11), the power distribution network (7) and the antenna radiation units are formed by multi-branch directional couplers in a serpentine strip line form and are integrated on a multilayer microstrip board in an integrated mode, the antenna radiation units are located on the uppermost layer, the power distribution network (7) is located in the middle layer, the slow wave line feed network (11) is located on the upper layer, the number of input ends of the power distribution network (7) is the same as that of output ends of the slow wave line feed network (11), the input ends of the power distribution network (7) are connected through metallized blind holes in a one-to-one correspondence mode, and the number of output ends of the power distribution network (7) is the same as that of patch units in the antenna radiation units, and the output ends of the power distribution network are connected through the metallized blind holes in a one-to-one correspondence mode.
The invention integrates the slow wave line feed network, the power dividing network and the antenna radiation unit on a multilayer microstrip board, completes the integration by one-time processing, has small volume and light weight, is beneficial to system integration, and meets the design requirement of low section, and simultaneously adopts the multi-branch directional coupler in the form of the serpentine strip line to form the slow wave line feed network which is a single-layer strip line structure, realizes large-angle frequency scanning under the conditions of limited bandwidth and space by changing the length of the slow wave line, and the multi-branch directional coupler meets the requirement of large power dividing ratio required by low side lobe amplitude distribution, thereby meeting the design requirements of low side lobes and large-angle frequency scanning.
Furthermore, the slow wave line feed network (11) comprises a plurality of multi-branch directional couplers, each multi-branch directional coupler comprises a coupling port and an isolation port, the coupling port is an output end of the multi-branch directional coupler, the isolation port is an input end of the multi-branch directional coupler, the multi-branch directional couplers are connected in series through the isolation ports to form a serpentine strip line, and the isolation ports at the head end and the tail end of the multi-branch directional couplers connected in series are connected with two ends of a patch load.
Furthermore, the power distribution network (7) is formed by arranging a plurality of identical power distributors at equal intervals, each power distributor comprises an input end and a plurality of output ends, and the input end of each power distributor is correspondingly connected with a coupling port of one multi-branch directional coupler.
Furthermore, the antenna radiation unit comprises an antenna parasitic patch layer (1), foam (2) and an antenna radiation patch layer (3), the antenna parasitic patch layer (1) and the antenna radiation patch layer (3) are separated through the foam (2), the antenna radiation patch layer (3) is located above the power distribution network (7), the antenna parasitic patch layer (1) comprises a plurality of parasitic patches (24), the antenna radiation patch layer (3) comprises a plurality of radiation patches (25), the number of the parasitic patches (24) is the same as that of the radiation patches (25), the positions of the parasitic patches (24) correspond to those of the radiation patches (25) one by one, each output end of each power distribution device is connected with one radiation patch (25), the sum of the number of the output ends of all power distribution devices is the same as that of the radiation patches (25), and the signal of each radiation patch (25) is coupled to the parasitic patch (24) corresponding to the position of the parasitic patches (24).
Still further, the parasitic patch (24) and the radiation patch (25) are rectangular patches with slots on the surfaces.
Still further, still be provided with first dielectric plate (4), first metal floor (5), second dielectric plate (6) between antenna radiation paster layer (3) and merit minute network (7), first dielectric plate (4), first metal floor (5), second dielectric plate (6) are in proper order range upon range of and arrange and first dielectric plate (4) are located the below of antenna radiation paster layer (3), and second dielectric plate (6) are located the top of merit minute network (7), the material of second dielectric plate (6) is RT6002, and the dielectric constant is 2.94, and thickness is 0.508 mm.
Furthermore, a third dielectric plate (8), a second metal floor (9) and a fourth dielectric plate (10) are further arranged between the power distribution network (7) and the slow wave line feed network (11), the third dielectric plate (8), the second metal floor (9) and the fourth dielectric plate (10) are sequentially arranged in a stacked mode, the third dielectric plate (8) is located below the power distribution network (7), and the fourth dielectric plate (10) is located above the slow wave line feed network (11).
Furthermore, the material of the third dielectric plate (8) is RT6002, the dielectric constant is 2.94 and the thickness is 0.508mm, and the material of the fourth dielectric plate (10) is RT5880, the dielectric constant is 2.2 and the thickness is 0.254 mm.
Furthermore, a fifth dielectric plate (12) and a third metal floor (13) are sequentially arranged below the slow-wave line feed network (11), the fifth dielectric plate (12) is located below the slow-wave line feed network (11), and the third metal floor (13) is located below the fifth dielectric plate (12).
Furthermore, the material of the fifth dielectric plate (12) is RT5880, the dielectric constant is 2.2, and the thickness is 0.254 mm.
The invention has the advantages that:
(1) the invention integrates the slow wave line feed network, the power dividing network and the antenna radiation unit on a multilayer microstrip board, completes the integration by one-time processing, has small volume and light weight, is beneficial to system integration, and meets the design requirement of low section, and simultaneously adopts the multi-branch directional coupler in the form of the serpentine strip line to form the slow wave line feed network which is a single-layer strip line structure, realizes large-angle frequency scanning under the conditions of limited bandwidth and space by changing the length of the slow wave line, and the multi-branch directional coupler meets the requirement of large power dividing ratio required by low side lobe amplitude distribution, thereby meeting the design requirements of low side lobes and large-angle frequency scanning.
(2) The invention uses the metallized blind holes to connect the slow wave line feed network and the power dividing network, the power dividing network and the antenna radiation unit, and the mode not only can reduce the loss, but also is easy for impedance matching and integrated processing.
(3) The antenna radiation unit adopts a double-layer metal patch form and is of a non-independent structure, the two layers of patches are separated by foam, the impedance bandwidth of the antenna can be increased by the double-layer patch form of the radiation patch and the parasitic patch, the parasitic patch is introduced to add a resonant frequency of the antenna, and through the optimized design, when the resonant frequencies of the upper layer and the lower layer are close to each other and a double-resonant impedance curve is formed in a working frequency band, the bandwidth of the antenna is greatly increased.
Drawings
Fig. 1 is a schematic structural diagram of a low-profile, low-sidelobe and large-angle frequency-scanning array antenna disclosed in the embodiment of the present invention;
FIG. 2 is a schematic diagram of a slow wave line feed network according to the present invention;
FIG. 3 is a diagram illustrating the result of amplitude weighting distribution of the slow wave line feed network according to the present invention;
FIG. 4 is a diagram illustrating a power distribution network according to the present invention;
fig. 5 is a schematic diagram of a power distribution result of the power distribution network according to the present invention;
FIG. 6 is a schematic diagram of an antenna radiation unit according to the present invention;
fig. 7 is a schematic diagram of a parasitic patch structure in an antenna radiation unit according to the present invention;
fig. 8 is a schematic view of a radiation patch structure in the antenna radiation unit according to the present invention;
FIG. 9 is a graph showing the result of standing waves in the antenna radiating element of the present invention;
fig. 10 is a schematic diagram of the antenna radiating element pattern results of the present invention;
FIG. 11 is a directional frequency scanning pattern of an array antenna according to the present invention;
fig. 12 is a fixed beam pattern for the elevation of an array antenna of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a low-profile, low-sidelobe, large-angle frequency-scanning array antenna has a working frequency band of 15.7GHz to 17.7GHz, and includes a slow-wave line feed network 11, a power division network 7, and antenna radiation units, which are formed by multi-branch directional couplers in the form of serpentine strip lines, the slow-wave line feed network 11, the power division network 7, and the antenna radiation units are integrated on a multilayer microstrip board, the antenna radiation units are located on the uppermost layer, the power division network 7 is located on the middle layer, the slow-wave line feed network 11 is located on the upper layer, the input ends of the power division network 7 are connected with the output ends of the slow-wave line feed network 11 in the same number and in one-to-one correspondence through metallized blind holes, and the output ends of the power division network 7 are connected with patch units in the antenna radiation units in the same number and in one-to-one correspondence through metallized blind holes.
As shown in fig. 2, the slow wave line feeding network 11 is a stripline structure, the width and the thickness of the slow wave line feeding network are less than 1/20 wavelengths, the slow wave line feeding network 11 includes 16 four-branch directional couplers, each coupler is designed to be different power ratio according to different amplitude weightings, each four-branch directional coupler can realize any power ratio by designing the width of a connection line 16, the four-branch directional coupler includes a coupling port 14 and an isolation port 15, the coupling port 14 is an output end of the four-branch directional coupler, the isolation port 15 is an input end of the four-branch directional coupler, a plurality of the four-branch directional couplers are connected in series through the isolation port 15 to form a serpentine stripline form, and the isolation ports 15 at the head end and the tail end of the plurality of the four-branch directional couplers connected in series are connected with two ends of a patch load. Amplitude weighting is achieved by designing the power division ratio of the four-branch directional coupler through interlayer metallization blind hole feeding, and low side lobes are achieved.
The voltage amplitude distribution of each coupling port 14 of the four-branch directional coupler can be obtained by using simulation software HFSS, and then compared with an ideal-30 dB Taylor distribution, as shown in FIG. 3, the design value and the theoretical value are basically consistent.
As shown in fig. 4, the power dividing network 7 is formed by 16 identical 1-to-6 equal-power dividers arranged at equal intervals along the X axis (azimuth direction), and in practical application, 1-to-2 equal-power dividers, 1-to-4 equal-power dividers, 1-to-8 equal-power dividers, and the like may be adopted, where each 1-to-6 equal-power divider includes an input end and 6 output ends, and the input end of each 1-to-6 equal-power divider is correspondingly connected to the coupling port 14 of one four-branch directional coupler. As shown in fig. 4, the 1-to-6 equal power divider has an input port 17 and six output ports 18-23, and each output port is connected with an antenna radiation unit on an upper layer through a metallized blind hole.
Simulation software HFSS is adopted to perform simulation calculation on the power divider, the power of the input port 17 to the output ports 18-23 in the whole working frequency range is shown in fig. 5, and it can be seen in fig. 5 that the power of the six output ports is basically distributed according to equal amplitude to meet the design requirement.
As shown in fig. 1 in combination with fig. 6 to 8, the antenna radiation unit includes an antenna parasitic patch layer 1, foam 2 and an antenna radiation patch layer 3, the antenna parasitic patch layer 1 and the antenna radiation patch layer 3 are separated by the foam 2, the antenna radiation patch layer 3 is located above the power division network 7, the antenna parasitic patch layer 1 includes 6 by 16 parasitic patches 24, the antenna radiation patch layer 3 includes 6 by 16 radiation patches 25, the parasitic patches 24 and the radiation patches 25 have the same number and the one-to-one correspondence in position, each output end of each power divider is connected to one radiation patch 25, the sum of the numbers of the output ends of all the power dividers is the same as the number of the radiation patches 25, and the signal of each radiation patch 25 is coupled to the parasitic patch 24 corresponding to the position. The parasitic patch 24 and the radiation patch 25 are rectangular patches with slots on the surfaces. As shown in fig. 6, a schematic diagram of a pair of the parasitic patch 24 and the radiating patch 25 is shown, and the critical dimensions of the parasitic patch 24 and the radiating patch 25 are as follows: w is 5.2mm, ws is 4mm, wd is 0.5mm, wl is 0.65mm, l is 4.85 mm.
The electrical performance of the antenna radiation unit is shown in fig. 9 and 10, the active standing wave of the antenna is better than 2.8 in the working frequency band, and when the antenna unit is at the central frequency point, the E-plane 3dB beam width is 60 °, and the H-plane 3dB beam width is 80 °.
With reference to fig. 1, as a further improvement, a first dielectric plate 4, a first metal floor 5, and a second dielectric plate 6 are further disposed between the antenna radiation patch layer 3 and the power distribution network 7, the first dielectric plate 4, the first metal floor 5, and the second dielectric plate 6 are sequentially stacked, the first dielectric plate 4 is located below the antenna radiation patch layer 3, the second dielectric plate 6 is located above the power distribution network 7, the second dielectric plate 6 is made of RT6002, has a dielectric constant of 2.94, and has a thickness of 0.508 mm.
With reference to fig. 1, as a further improvement, a third dielectric plate 8, a second metal floor 9, and a fourth dielectric plate 10 are further disposed between the power distribution network 7 and the slow-wave line feed network 11, the third dielectric plate 8, the second metal floor 9, and the fourth dielectric plate 10 are sequentially stacked, the third dielectric plate 8 is located below the power distribution network 7, and the fourth dielectric plate 10 is located above the slow-wave line feed network 11. The third dielectric plate 8 is made of RT6002, the dielectric constant is 2.94, and the thickness is 0.508mm, and the fourth dielectric plate 10 is made of RT5880, the dielectric constant is 2.2, and the thickness is 0.254 mm.
With reference to fig. 1, as a further improvement, a fifth dielectric plate 12 and a third metal floor 13 are sequentially disposed below the slow-wave line feed network 11, where the fifth dielectric plate 12 is located below the slow-wave line feed network 11, and the third metal floor 13 is located below the fifth dielectric plate 12. The material of the fifth dielectric plate 12 is RT5880, the dielectric constant is 2.2, and the thickness is 0.254 mm.
The simulation result of the whole array is shown in fig. 5, wherein fig. 11 is the curve of the array in xoz plane (azimuth direction) and the beam scans along with the frequency, and it can be seen that in the working frequency band, the beam scanning range can be from-53 to 38 degrees, and in the whole scanning process, the voltage side lobe level is better than-25 dB, and the low side lobe and large angle frequency scanning of the azimuth direction is realized. Fig. 12 is a fixed beam in the yoz plane (elevation direction) at each frequency, and it can be seen that the pattern is substantially uniformly distributed with side lobes around-13.
Summary the antenna array electrical performance is as follows:
table 1 antenna array electrical performance
The working principle of the invention is as follows:
according to theoretical analysis, the beam scanning angle of the array and the phase difference between two adjacent units in the array satisfy the following relation:
in a phased array, the above phase difference is realized by phase shifters in T/R assemblies, and in a frequency-swept antenna, it is realized by feeding lines with the same phase constant but different lengths by L, so that the phase difference generated between two adjacent units is:
in the formula (2), λgThe medium wavelength of the slow wave line.
It can be seen that when L is constant, λ is changedgNamely the working frequency of the radar, the phase difference between two adjacent units is changed, the beam direction of the antenna array is changed, and beam scanning is carried out. This is the basic principle of slow-wave line frequency scanning. When a transmission line with a length of L operates at two frequencies, the phase difference is:
as can be seen from equation (3), to implement large-angle scanning, the working bandwidth can be increased by (1); (2) the length L of the transmission line is increased to realize the purpose, and the scanning angle is often increased by increasing the length L of the slow wave line in engineering because the increased bandwidth brings great design difficulty to a feed system. In order to realize large-angle frequency scanning under the conditions of limited bandwidth and space, the invention adopts the four-branch directional coupler in the form of a serpentine strip line, and meets the requirement of a scanning range by designing the length L of a slow wave line. In order to realize the low side lobe design, the four-branch directional coupler is adopted to form the slow wave line, and the coupler can meet the requirement of large power division ratio required by low side lobe amplitude distribution. The invention uses the metallized blind holes to connect the slow wave line and the power dividing network, and the power dividing network and the antenna unit, and the mode not only can reduce the loss, but also is easy for impedance matching and integrated processing. The antenna unit of the invention adopts a double-layer metal patch form, the two layers of patches are separated by foam, the impedance bandwidth of the antenna can be increased by the double-layer patch form of the radiation patch and the parasitic patch, and the introduction of the parasitic patch adds a resonant frequency of the antenna. And finally, combining the slow wave line feed network 11, the power division network 7 and the antenna radiation unit, and realizing low side lobe and large-angle frequency scanning through reasonable layout and optimization. And (3) carrying out simulation experiments on the array by using HFSS simulation software, and continuously optimizing sensitive parameters to finally obtain good side lobes and scanning effects.
The invention uses a radiation patch and integrated patch double-layer structure as an antenna radiation unit, forms a pitching wave beam through the power dividing network 7, and adopts a slow wave line feed network 11 formed by a multi-branch directional coupler to carry out series feed on each power dividing network 7, thereby realizing low side lobe and large angle scanning. The specific experimental results show that: the array can cover minus 53 degrees to 38 degrees in the azimuth direction, the side lobes are all better than minus 25dB, and the thickness of the whole array surface is only 4 mm.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The low-profile low-sidelobe large-angle frequency-scanning array antenna is characterized by comprising a slow wave line feed network (11), a power distribution network (7) and antenna radiation units, wherein the slow wave line feed network (11), the power distribution network (7) and the antenna radiation units are formed by multi-branch directional couplers in a serpentine strip line form and are integrated on a multilayer microstrip board in an integrated mode, the antenna radiation units are located on the uppermost layer, the power distribution network (7) is located in the middle layer, the slow wave line feed network (11) is located on the upper layer, the input ends of the power distribution network (7) are connected with the output ends of the slow wave line feed network (11) in a one-to-one correspondence mode through metallized blind holes, and the output ends of the power distribution network (7) are connected with patch units in the antenna radiation units in a one-to-one correspondence mode through the metallized blind holes;
the antenna radiation unit comprises an antenna parasitic patch layer (1), foam (2) and an antenna radiation patch layer (3), the antenna parasitic patch layer (1) and the antenna radiation patch layer (3) are separated through the foam (2), the antenna radiation patch layer (3) is located above the power distribution network (7), the antenna parasitic patch layer (1) comprises a plurality of parasitic patches (24), the antenna radiation patch layer (3) comprises a plurality of radiation patches (25), the number of the parasitic patches (24) is the same as that of the radiation patches (25), the positions of the parasitic patches (24) are in one-to-one correspondence, each output end of each power divider is connected with one radiation patch (25), the sum of the number of the output ends of all the power dividers is the same as that of the radiation patches (25), and signals of each radiation patch (25) are coupled to the parasitic patches (24) corresponding to the positions of the parasitic patches (24); the parasitic patch (24) and the radiation patch (25) are rectangular patches with slots on the surfaces; a first dielectric plate (4), a first metal floor (5) and a second dielectric plate (6) are further arranged between the antenna radiation patch layer (3) and the power distribution network (7), the first dielectric plate (4), the first metal floor (5) and the second dielectric plate (6) are sequentially arranged in a stacked mode, the first dielectric plate (4) is located below the antenna radiation patch layer (3), and the second dielectric plate (6) is located above the power distribution network (7); a third dielectric plate (8), a second metal floor (9) and a fourth dielectric plate (10) are further arranged between the power distribution network (7) and the slow-wave line feed network (11), the third dielectric plate (8), the second metal floor (9) and the fourth dielectric plate (10) are sequentially arranged in a stacked mode, the third dielectric plate (8) is located below the power distribution network (7), and the fourth dielectric plate (10) is located above the slow-wave line feed network (11); a fifth dielectric plate (12) and a third metal floor (13) are sequentially arranged below the slow-wave line feed network (11), the fifth dielectric plate (12) is located below the slow-wave line feed network (11), and the third metal floor (13) is located below the fifth dielectric plate (12).
2. The low-profile low-sidelobe large-angle frequency-swept array antenna according to claim 1, wherein the slow wave line feed network (11) comprises a plurality of multi-branch directional couplers, each multi-branch directional coupler comprises a coupling port and an isolation port, the coupling port is an output end of the multi-branch directional coupler, the isolation port is an input end of the multi-branch directional coupler, the plurality of multi-branch directional couplers are connected in series through the isolation ports to form a serpentine strip line, and the isolation ports at the head end and the tail end of the plurality of multi-branch directional couplers connected in series are connected with two ends of a patch load.
3. The low-profile low-sidelobe large-angle frequency-scanning array antenna as claimed in claim 2, wherein the power divider network (7) is composed of a plurality of identical power dividers arranged at equal intervals, each power divider comprises an input end and a plurality of output ends, and the input end of each power divider is correspondingly connected with a coupling port of a multi-branch directional coupler.
4. The array antenna as claimed in claim 1, wherein the second dielectric plate (6) is made of RT6002, has a dielectric constant of 2.94 and a thickness of 0.508 mm.
5. The array antenna as claimed in claim 1, wherein the third dielectric plate (8) is made of RT6002, the dielectric constant is 2.94 and the thickness is 0.508mm, and the fourth dielectric plate (10) is made of RT5880, the dielectric constant is 2.2 and the thickness is 0.254 mm.
6. The array antenna of claim 1, wherein the fifth dielectric plate (12) is made of RT5880, 2.2 in dielectric constant and 0.254mm in thickness.
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