A feeding network unit and an antenna array using the feeding network unit

Abstract

The present invention discloses a feed network unit in the field of radar antenna communication and an antenna array using the feed network unit. The feed network unit includes a feed unit and a waveguide coaxial converter. The feed unit includes a feed waveguide. A power coupling structure in the shape of a bent slot is provided on the rear side of the feed waveguide, and a phase shift unit is coupled through the power coupling structure. A coupling output end is provided on the rear side of the phase shift unit. The left and right sides of the phase shift unit are both connected and provided with a first phase compensation unit. The antenna array includes a phased array unit arranged in an array, a phased array unit antenna unit and two feed network units arranged in parallel, and the waveguide coaxial converters in the two feed network units are connected to the antenna unit. The present invention realizes that different polarizations use the same feed structure by improving each component in the phased array unit, which physically ensures the consistency of the radiation performance of the phased array antenna and reduces the loss of the feed line.

Description

Technical Field

[0001] The present invention relates to the field of radar antenna communication, in particular to a feeding network unit and an antenna array using the feeding network unit. Background Art

[0002] With the development of electronic information technology, multi-band and multi-polarization radar detection can be carried out by utilizing the differences in scattering characteristics of electromagnetic waves of different bands and polarizations on targets or objects, so as to obtain more complete information about targets or objects and enhance target detection and classification and identification capabilities, such as satellite high-resolution SAR systems and meteorological dual-polarization radar systems.

[0003] Compared with conventional single-polarization antennas, multi-polarization antennas need to focus on parameters such as cross-polarization and isolation, in addition to performance parameters such as bandwidth, gain, beam width, beam shape, sidelobe, efficiency, and port voltage standing wave ratio, especially the consistency of various parameters of different polarization radiation patterns.

[0004] At present, the commonly used forms of dual-polarization one-dimensional phase-scanned antennas are dual-polarization waveguide slot antennas, microstrip dual-polarization antennas, and cross-array antennas. The bandwidth of the standing wave dual-polarization waveguide slot antenna is related to the network complexity. In large-size high-gain one-dimensional phase-scanned antennas, the feeding network of the standing wave dual-polarization waveguide slot antenna is usually more complicated. At the same time, the slots used for vertical and horizontal polarization are usually different. Due to the existence of processing errors, the dual-polarization antenna beam pointing and beam width are inconsistent. The beam pointing and beam width in the non-scanning dimension are inconsistent, and the system cannot correct them.

[0005] Dual-polarized microstrip antennas and cross-array antennas usually use substrates or air plate lines as power splitter networks. In low-frequency bands such as the C-band, the radar system loss caused by the feed line is acceptable. However, in frequency bands above the X-band, the existing processing technology cannot meet the processing accuracy requirements of large-size air plate lines. Even if some improvements are used, the loss caused by the feed line is usually relatively large when the size is large.

[0006] In order to improve the above technical problems, the applicant proposes a feeding network unit and an antenna array using the feeding network unit. Summary of the invention

[0007] The object of the present invention is to provide a feeding network unit and an antenna array using the feeding network unit to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A feeding network unit comprises a feeding unit and a waveguide coaxial converter, wherein the feeding unit comprises a feeding waveguide, a bent slot-shaped power coupling structure is provided at the rear side of the feeding waveguide, and a phase shifting unit is coupled via the power coupling structure, a coupling output end is provided at the rear side of the phase shifting unit, and the phase shifting unit is coupled to the waveguide coaxial converter via the coupling output end.

[0010] As an improvement of the above technical solution, in order to further compensate for the difference in insertion phase caused by power coupling structures of different sizes in the feeding waveguide, the left and right sides of the phase shifting unit are connected to each other and are provided with a first phase compensation part, which is a step structure or a dielectric insertion structure.

[0011] As an improved solution of the above technical solution, in order to further compensate for the difference in insertion phase caused by power coupling structures of different sizes in the feeding waveguide, a second phase compensation portion is provided on the front side of the feeding waveguide, and the second phase compensation portion is connected to the interior of the feeding waveguide, and the second phase compensation portion is a step structure or a dielectric insertion structure.

[0012] As an improvement of the above technical solution, in order to make the phase adjustment performance and size suitable, when the first phase compensation part and the second phase compensation part are step structures, the number of step sections is 2.

[0013] An antenna array using a feed network unit comprises a phased array unit arranged in an array, wherein the phased array unit comprises an antenna unit and two feed network units arranged in parallel, wherein the waveguide coaxial converters in the two feed network units are commonly connected to the antenna unit; the antenna unit comprises a metal shell, wherein at least three dielectric layers parallel to the inner bottom surface of the metal shell are connected to the inner side wall thereof, and the dielectric layers divide the metal shell into at least three cavities, wherein a patch antenna microstrip feeder is arranged on the innermost dielectric layer, and radiation patches are arranged on at least two outer dielectric layers.

[0014] As an improvement of the above technical solution, in order to suppress the asymmetric high-order resonant electromagnetic field in the innermost cavity and further improve the antenna port isolation and cross-polarization level, metal columns are symmetrically distributed on the inner bottom surface of the metal shell.

[0015] As an improved solution of the above technical solution, in order to maximize the performance and beam equalization of the dual-polarized antenna unit, the dielectric layer is provided with three layers, namely, a first dielectric layer, a second dielectric layer and a third dielectric layer from the outside to the inside, and the first dielectric layer, the second dielectric layer and the third dielectric layer all include a dielectric substrate; a metal layer is provided in parallel on the outer side of the dielectric substrate of the third dielectric layer, and the dielectric substrate of the third dielectric layer is provided with a through hole corresponding to the metal column.

[0016] As an improved solution of the above technical solution, in order to reduce the loss caused by the feeding structure, an H-shaped feeding coupling gap is etched on the metal layer, and the patch antenna microstrip feed line is T-shaped.

[0017] As an improved solution of the above technical solution, in order to facilitate the realization of 180° phase reversal compensation within a broadband, the coaxial output port of the waveguide coaxial converter is located in the middle of the rear side of the feeding waveguide, and a step-type impedance is provided inside the waveguide coaxial converter. The step-type impedances of the two waveguide coaxial converters in the same phased array unit are in the same direction, and the step-type impedances of the waveguide coaxial converters in two adjacent phased array units are in opposite directions.

[0018] Beneficial effects: The present invention proposes a feeding network unit and an antenna array, wherein the feeding network unit improves the performance of the antenna through a first phase compensation part and a second phase compensation part, and the antenna unit in the antenna array is improved, and at least a three-cavity structure of a metal shell is adopted to reduce the quality factor of the antenna and widen the antenna bandwidth. In addition, a metal column can be arranged in the metal shell to suppress the asymmetric high-order resonant electromagnetic field in the innermost cavity, thereby improving the bandwidth, cross-polarization, and port isolation indicators of the antenna.

[0019] The present invention realizes the use of the same feeding structure for different polarizations by improving each component in the phased array unit, designs a phased array unit with high beam consistency, low cross-polarization, and high isolation, ensures the consistency of antenna gain, beam pointing, beam width, and sidelobe level for different polarizations, further improves the consistency of antenna gain, beam width, and sidelobe level, and reduces the loss caused by the feeder line. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of an implementation of a feeding unit of the present invention;

[0021] Figure 2 is a schematic diagram of another embodiment of a feed unit of the present invention;

[0022] Figure 3 is a schematic diagram of an antenna array of the present invention;

[0023] Figure 4 for Figure 3 A partial enlarged schematic diagram of

[0024] Figure 5 is a cross-sectional schematic diagram of the antenna unit of the present invention;

[0025] Figure 6 A schematic diagram of a certain angle when the antenna unit of the present invention does not include a metal shell;

[0026] Figure 7It is a schematic diagram from another angle when the antenna unit of the present invention does not include a metal shell;

[0027] Figure 8 It is a schematic diagram of the structure of the waveguide coaxial converter of the present invention;

[0028] Fig. 9 is the radiation pattern of the antenna unit of the present invention;

[0029] Fig.10 It is an S parameter curve diagram of the antenna unit of the present invention.

[0030] In the figure: 1-feeding unit; 101-feeding waveguide; 102-first phase compensation part; 103-second phase compensation part; 104-phase shifting unit; 105-coupling output end; 106-power coupling structure; 2-antenna unit; 201-metal shell; 202-first dielectric layer; 203-second dielectric layer; 204-third dielectric layer; 205-metal column; 206-metal layer; 207-through hole; 208-radiating patch; 209-feeding coupling gap; 210-patch antenna microstrip feed line; 3-waveguide coaxial converter; 301-step impedance; 302-coaxial output port. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1, see Figure 1 A feeding network unit includes a feeding unit 1 and a waveguide coaxial converter 3. The feeding unit 1 includes a feeding waveguide 101. A bending slot-shaped power coupling structure 106 is provided at the rear side of the feeding waveguide 101, and a phase shifting unit 104 is coupled through the power coupling structure 106. A coupling output end 105 is provided at the rear side of the phase shifting unit 104, and the coupling output end 105 is coupled to the waveguide coaxial converter 3.

[0033] The power coupling structure 106 is usually a circular hole or a rectangular gap coupling. In the present embodiment, the power coupling structure 106 is in a bent form, such as S, Z, N, H and other bent shapes. The bent gap-shaped power coupling structure is used to increase its power division ratio range and improve the frequency width of its coupling performance. The coupling degree of the power coupling structure 106 can be adjusted by controlling the total length of the bent gap.

[0034] Preferably, in this embodiment, the gap width of the power coupling structure 106 is 1 mm.

[0035] Since the power coupling structure 106 adopts a bent gap shape and is a non-resonant structure, the left and right sides of the phase shift unit 104 are both connected and provided with a first phase compensation unit 102. The first phase compensation unit 102 is a step structure or a dielectric insertion structure, which is arranged on the wide side of the phase shift unit 104. The first phase compensation unit 102 compensates for the additional insertion phase shift caused by the power coupling structure.

[0036] Optionally, in this embodiment, the feeding waveguide 101 is a guided wave of the feeding unit 1 , and may be a stripline, a ridge waveguide or other forms.

[0037] Preferably, in this embodiment, in order to increase the scanning angle of the phased array antenna, the feeding unit 1 adopts a low-profile waveguide form, and the feeding waveguide 101 is a non-standard half-height waveguide form, whose wide side meets the single-mode transmission requirements, and the narrow side adopts a non-standard waveguide structure, and the thickness of the narrow side is less than 0.5 times that of the standard waveguide.

[0038] Preferably, in this embodiment, the wide side length of the feeding waveguide 101 is 22.86 mm, and the narrow side length is 5 mm.

[0039] Optionally, the coupling output end 105 is a guide structure of other forms in the low frequency band, and a waveguide structure in the X band and above, to reduce feeder loss. In this embodiment, the coupling output end 105 is disposed in the middle of the narrow side of the phase shift unit 104 .

[0040] Alternatively, if Figure 8 As shown, the coaxial output port 302 of the waveguide coaxial converter 3 is located in the middle of the rear side of the feeding waveguide 101, and a step-type impedance 301 is provided inside the waveguide coaxial converter 3. The step-type impedance 301 is a guided wave form conversion structure, which realizes the transformation from waveguide to coaxial, and can also be other conversion forms such as waveguide to microstrip, stripline, coplanar waveguide, etc. In order to ensure that the output ports are in the same structural position, the coaxial output port 302 is designed at the center of the narrow side of the waveguide.

[0041] Embodiment 2, on the basis of embodiment 1, a second phase compensating portion 103 is provided on the front side of the feeding waveguide 101, and the second phase compensating portion 103 is connected to the inside of the feeding waveguide 101. The second phase compensating portion 103 is used to adjust the difference in insertion phase caused by the bending gaps of different sizes of the power coupling structure 106 in the feeding waveguide 101, and also plays a role in impedance matching of the feeding waveguide 101.

[0042] In this embodiment, the second phase compensator 103 is a step structure or a dielectric insertion structure, which can be used to achieve a phase shift function, and adjust the electromagnetic wave transmission phase by changing the transmission characteristics of the electromagnetic wave in the conductive structure. By adjusting the width between the left and right sides of the feeding waveguide 101, the first phase compensator 102 and the second phase compensator 103 are indirectly adjusted, which can ensure the consistency of the antenna's related indicators with the design.

[0043] Embodiment 3, Figure 1 In this embodiment, the power coupling structure 106 adopts a Z-shaped bending gap, and optionally, the first phase compensation part 102 and the second phase compensation part 103 are both step structures.

[0044] The first phase compensation part 102 is presented by two sets of symmetrical and relatively descending steps. Figure 1 As shown, or presented by two sets of symmetrical and relatively increasing steps, the additional phase deviation in the main waveguide caused by the power coupling structure 106 used for sidelobe amplitude weighting is compensated.

[0045] Optionally, the number of step sections of the two groups of steps is at least one, and the more the number of step sections is, the better the performance of the phase compensation is and the larger the size is.

[0046] Preferably, the number of step sections of the two groups of steps of the first phase compensation portion 102 are both 2.

[0047] The second phase compensating portion 103 is in a step-like shape that decreases or increases symmetrically from the middle to the left and right sides of the feeding waveguide 101. However, the increasing form will increase the size of the second phase compensating portion 103, increasing the difficulty of processing.

[0048] Optionally, the number of step sections on both sides of the second phase compensation portion 103 is at least one, and the more step sections there are, the better the performance of the phase compensation is, and the larger the size thereof is.

[0049] Preferably, the number of step sections on both sides of the second phase compensation portion 103 is 2, which has good performance, small size, and is relatively optimal.

[0050] Embodiment 4, Figure 2 Another implementation structure of the feed unit is shown. In this embodiment, the power coupling structure 106 adopts an H-shaped bending gap, and compared with the Z-shaped bending gap, the flatness of the coupling degree at different frequencies is different. Optionally, the first phase compensation part 102 and the second phase compensation part 103 are both step structures.

[0051] The first phase compensation portion 102 is in the shape of a group of steps descending toward the feeding waveguide 101 .

[0052] Optionally, the number of step sections of the group of steps is at least one, and the more the number of step sections is, the better the performance of the phase compensation is and the larger the size is.

[0053] Preferably, the number of step sections in this group is 2, which has good performance, small size and is relatively optimal.

[0054] The second phase compensating portion 103 is in a stepped shape that increases symmetrically from the middle to the left and right sides of the feeding waveguide 101 .

[0055] When the first phase compensating portion 102 and the second phase compensating portion 103 are step structures, the number of step sections is two.

[0056] Optionally, the number of step sections on both sides of the second phase compensation portion 103 is at least one, and the more step sections there are, the better the performance of the phase compensation is, and the larger the size thereof is.

[0057] Preferably, the number of step sections on both sides of the second phase compensation portion 103 is 2, which has good performance, small size, and is relatively optimal.

[0058] See also Figure 3-4 An antenna array includes a phased array unit arranged in an array, the phased array unit includes an antenna unit 2 and two parallel feeding network units, the waveguide coaxial converters 3 in the two feeding network units are commonly connected to the antenna unit 2; the antenna unit 2 includes a metal shell 201, at least three dielectric layers parallel to the inner bottom surface of the metal shell 201 are connected to the inner wall, and the dielectric layers divide the metal shell 201 into at least three cavities, wherein a patch antenna microstrip feeder 210 is provided on the innermost dielectric layer, and a radiation patch 208 is provided on at least two outer dielectric layers.

[0059] like Figure 4 As shown, in the phased array unit, a group of antenna units corresponds to two feeding network units and one antenna unit. In the same phased array unit, the step impedance 301 of the waveguide coaxial converter 3 of the two feeding network units is in the same direction, and in two adjacent phased array units, the step impedance 301 of the waveguide coaxial converter 3 is in the opposite direction. The step impedance 301 of the waveguide coaxial converter 3 is alternately in the same direction with the odd and even array sequence of the antenna units in the phased array unit. The ports of the odd-numbered phased array unit and the ports of the even-numbered phased array unit are rotated 180 degrees to achieve the phase inconsistency brought by the feeding waveguide 101. The half-wavelength wide-band 180° phase compensation in the series-fed structure compensates for the additional unnecessary phase error brought by the feeding network unit. At the same time, the overall structure of the antenna is simplified, and the cross-polarization level of the antenna is further reduced.

[0060] The feeding network units of different polarizations are symmetrically designed, and the feeding network units adopt the same guided wave structure. The feeding waveguide 101 array in the feeding unit 1 of the phased array unit constitutes a feeding guided wave system.

[0061] The feeding network units of the antenna units 2 with different polarizations use the same structural process to minimize the processing error. If there is an error, the processing error of the dual-polarization antenna feeding structure can be ensured to be the same, and the impact on the dual-polarization electrical performance is consistent.

[0062] In addition, there are usually two cavities inside the antenna unit, and it is difficult to ensure the consistency of the antenna unit beam. In this embodiment, there are at least three cavities, and the innermost cavity is formed by the innermost dielectric layer and the inner side wall and inner bottom surface of the metal shell 201, which is called a reflection cavity, and the remaining cavities are called radiation cavities. When there are three or more cavities, the quality factor of the antenna can be reduced and the antenna bandwidth can be widened.

[0063] Example 5, see Figure 5 Metal pillars 205 are symmetrically distributed on the inner bottom surface of the metal shell 201. The metal pillars 205 are located in the reflection cavity and can suppress the asymmetric high-order resonant electromagnetic field in the reflection cavity, further improving the antenna port isolation and cross-polarization level.

[0064] Preferably, see Figure 6-7 In this embodiment, the dielectric layer is provided with three layers, which are the first dielectric layer 202, the second dielectric layer 203 and the third dielectric layer 204 from the outside to the inside. The first dielectric layer 202, the second dielectric layer 203 and the third dielectric layer 204 all include a dielectric substrate; a metal layer 206 is provided in parallel on the outer side of the dielectric substrate of the third dielectric layer 204, and a through hole 207 is provided on the dielectric substrate of the third dielectric layer 204 corresponding to the metal column 205.

[0065] When the dielectric layer is set to three layers, the third dielectric layer 204 and the inner wall and inner bottom surface of the metal shell 201 form a reflection cavity, the third dielectric layer 204 and the second dielectric layer 203 and the inner wall of the metal shell 201 form the first radiation cavity, and the second dielectric layer 203 and the first dielectric layer 202 and the inner wall of the metal shell 201 form the second radiation cavity. When there are three cavities, the antenna unit can reduce the quality factor of the antenna to the greatest extent, broaden the antenna bandwidth, and improve performance.

[0066] In this embodiment, the through hole 207 is used to achieve the connection between the metal pillar 205 and the metal layer 206 .

[0067] Optionally, the radiation patch 208 uses the dielectric substrate as a carrier and is selectively disposed on the first side surface or the second side surface of the dielectric substrate of the first dielectric layer 202 or the second dielectric layer 203 .

[0068] Preferably, an H-shaped feeding coupling slot 209 is etched on the metal layer 206 to reduce the feeding structure, and the patch antenna microstrip feed line 210 is T-shaped.

[0069] Figure 9-10 They are respectively the radiation pattern and S parameter curve of the antenna unit of the present invention. It can be seen from the figure that the present invention can ensure the consistency of antenna gain, beam pointing and beam width, and sidelobe level of different polarization antennas, further improve the consistency of antenna gain, beam width, and sidelobe level, and reduce the loss caused by the feeder line.

[0070] In addition, the amplitude-phase weighting of phased array units can be optimized through optimization algorithms such as particle swarm and genetic algorithm to maximize the consistency of various parameters of the radiation patterns of different polarization antennas of the phased array antenna. By externally calibrating the dual-polarization antenna system and correcting the system parameters through antenna near-field test data, the consistency of gain, beam width, beam pointing and sidelobe level of different polarization antennas of the dual-polarization radar can be further improved.

[0071] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0072] In the description of the present invention, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0073] In the description of the present invention, it is also necessary to explain that the orientations or positional relationships indicated by the terms "upper", "lower", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0074] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. An antenna array using a feed network unit, the feed network unit comprising a feed unit (1) and a waveguide coaxial converter (3), the feed unit (1) comprising a feed waveguide (101), a bent slot-shaped power coupling structure (106) being provided at the rear side of the feed waveguide (101), and a phase shift unit (104) being coupled via the power coupling structure (106), a coupling output end (105) being provided at the rear side of the phase shift unit (104), and being coupled to the waveguide coaxial converter (3) via the coupling output end (105); the antenna array comprising a phased array unit arranged in an array, It is characterized in that Feed network units of different polarizations are symmetrically designed, and the feed network units adopt the same guided wave structure; the phased array unit comprises an antenna unit (2) and two feed network units arranged in parallel, and the waveguide coaxial converters (3) in the two feed network units are commonly connected to the antenna unit (2); the antenna unit (2) comprises a metal shell (201), at least three dielectric layers parallel to the inner bottom surface of the metal shell (201) are connected to the inner side wall, and the dielectric layers divide the metal shell (201) into at least three cavities, wherein a patch antenna microstrip feed line (210) is provided on the innermost dielectric layer, and radiation patches (208) are provided on at least two outer dielectric layers; the step impedances (301) of the two waveguide coaxial converters (3) in the same phased array unit are in the same direction, and the step impedances (301) of the waveguide coaxial converters (3) in two adjacent phased array units are in opposite directions.

2. An antenna array using a feed network unit according to claim 1, It is characterized in that The coaxial output port (302) of the waveguide-to-coaxial converter (3) is located in the middle of the rear side of the feeding waveguide (101), and a step-type impedance (301) is provided inside the waveguide-to-coaxial converter (3).

3. The antenna array using the feed network unit according to claim 2, It is characterized in that The left and right sides of the phase shift unit (104) are both connected to a first phase compensation part (102), and the first phase compensation part (102) is a step structure or a medium insertion structure.

4. The antenna array using the feed network unit according to claim 3, It is characterized in that A second phase compensation portion (103) is provided on the front side of the feeding waveguide (101); the second phase compensation portion (103) is connected to the inside of the feeding waveguide (101); and the second phase compensation portion (103) is a step structure or a dielectric insertion structure.

5. The antenna array using the feed network unit according to claim 4, It is characterized in that When the first phase compensation portion (102) and the second phase compensation portion (103) are step structures, the number of step sections is 2.

6. The antenna array using the feed network unit according to claim 1, It is characterized in that Metal pillars (205) are symmetrically distributed on the inner bottom surface of the metal shell (201).

7. The antenna array using the feed network unit according to claim 6, It is characterized in that The dielectric layer is provided with three layers, which are, from the outside to the inside, a first dielectric layer (202), a second dielectric layer (203) and a third dielectric layer (204); the first dielectric layer (202), the second dielectric layer (203) and the third dielectric layer (204) all comprise a dielectric substrate; a metal layer (206) is provided in parallel on the outer side of the dielectric substrate of the third dielectric layer (204); and a through hole (207) is provided on the dielectric substrate of the third dielectric layer (204) corresponding to the metal column (205).

8. The antenna array using the feed network unit according to claim 7, It is characterized in that An H-shaped feeding coupling slot (209) is etched on the metal layer (206), and the patch antenna microstrip feed line (210) is T-shaped.

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