Four-layer sixteen-microstrip element Yagi direction-finding antenna

Abstract

The invention relates to a four-layer sixteen-microstrip unit Yagi direction-finding antenna; the antenna comprises a vertically arranged supporting column, on which four layers of microstrip antennas of the same shape are arranged in sequence from bottom to top; each layer of microstrip antennas comprises four identical Yagi microstrip units, the four Yagi microstrip units are evenly distributed around the supporting column, each Yagi microstrip unit comprises a horizontally arranged microstrip substrate, and each microstrip substrate is provided with a printed Yagi antenna array; three projections of the second, third and fourth layers of microstrip antennas on a horizontal plane are respectively rotated by 22.5°, 45° and 67.5° around the center line of the supporting column in the same rotation direction, and all coincide with the projection of the first layer of microstrip antennas on the horizontal plane; the Yagi microstrip units of the invention have good linear polarization broadband characteristics, narrow beam width, high gain and good directivity, and 360° all-round coverage can be achieved after the sixteen Yagi microstrip units are arrayed.

Description

(I) Technical field:

[0001] The invention relates to an antenna, in particular to a four-layer sixteen-microstrip unit Yagi direction-finding antenna. (II) Background technology:

[0002] Microstrip antennas are light, thin, and flexible to feed. They can conform to the surface of the carrier, can achieve linear polarization and circular polarization, can operate in dual-band and triple-bands, and are easily integrated with active circuits on the same dielectric substrate. They can be mass-produced using printed circuit technology to reduce production costs. However, microstrip antennas also have some disadvantages, such as: narrow operating frequency, small allowable power range, large loss, easy formation of surface waves, causing antenna efficiency to decrease, and thus low gain. The errors in dielectric substrate thickness and dielectric constant have a great impact on bandwidth, gain and other performance. Therefore, it is of great practical significance to conduct in-depth research and discussion on microstrip antennas in terms of widening the bandwidth, reducing the size, increasing the gain, and array technology. Due to the unique characteristics of microstrip antennas, microstrip antennas have made certain breakthroughs in many aspects. The current research hotspots are mainly focused on broadband, miniaturization, high gain and array technology.

[0003] The antenna used for direction finding is also called a direction finding antenna. The direction finding antenna is a device used to determine the direction of the radio waves emitted by the radio station. The location of the transmitter can be determined by measuring the direction of the waves. The existing direction finding antenna has low gain, large size, and is inconvenient to carry. (III) Summary of the invention:

[0004] The technical problem to be solved by the present invention is: to provide a four-layer sixteen-microstrip unit Yagi direction-finding antenna, the Yagi microstrip unit of the antenna has good linear polarization broadband characteristics, narrow beam width, high gain, and good directivity. The sixteen Yagi microstrip units can achieve 360° all-round coverage after being arrayed.

[0005] The technical solution of the present invention:

[0006] A four-layer sixteen-microstrip unit Yagi direction-finding antenna comprises a vertically arranged support column, on which four layers of microstrip antennas are arranged, the four layers of microstrip antennas are in the same shape, and the four layers of microstrip antennas are sequentially arranged from bottom to top as follows: a first layer of microstrip antennas, a second layer of microstrip antennas, a third layer of microstrip antennas and a fourth layer of microstrip antennas; each layer of microstrip antennas comprises four identical Yagi microstrip units, the four Yagi microstrip units are evenly distributed around the support column, each Yagi microstrip unit comprises a horizontally arranged microstrip substrate, and each microstrip substrate is provided with a printed Yagi antenna array; the center line of each layer of microstrip antennas coincides with the center line of the support column, and three projections of the second layer of microstrip antennas, the third layer of microstrip antennas and the fourth layer of microstrip antennas on a horizontal plane coincide with the projection of the first layer of microstrip antenna on the horizontal plane after being rotated 22.5°, 45° and 67.5° respectively around the center line of the support column in the same rotation direction.

[0007] The four Yagi microstrip units in each layer of microstrip antenna are connected together through a horizontally arranged intermediate substrate, a first through hole is arranged in the middle of the intermediate substrate, a supporting column passes through the first through hole, and a center line of the microstrip antenna passes through the center of the first through hole; in each layer of microstrip antenna, the intermediate substrate and the four microstrip substrates are all located on the same horizontal plane, the four microstrip substrates are evenly distributed around the intermediate substrate, and the four microstrip substrates are all connected to the intermediate substrate.

[0008] The middle substrate and four microstrip substrates in each layer of microstrip antenna are an integrated structure.

[0009] Each printed Yagi antenna array contains N excitation arrays, M×N director arrays, N reflector arrays and a feed interface. The M×N director arrays are arranged in a matrix of M rows and N columns on the upper surface of the microstrip substrate, and the N reflector arrays are also arranged on the upper surface of the microstrip substrate; the N excitation arrays are respectively arranged in front of the N columns of director arrays, the N reflector arrays are respectively arranged in front of the N excitation arrays, and the feed interface is arranged in front of the N reflector arrays. A back metal coating is provided on the lower surface of the microstrip substrate and in the area corresponding to the N reflector arrays and the feed interface, and the ground terminal of the feed interface is connected to the back metal coating; each The excitation array comprises a left part and a right part, one part is located on the upper surface of the microstrip substrate, and the other part is located on the lower surface of the microstrip substrate and connected to the back metal coating, and the two parts of the excitation array are not connected to each other; a broken groove is opened in the middle of each reflective array, and the broken groove makes the left and right sides of the reflective array disconnected; a part of the N excitation arrays on the upper surface of the microstrip substrate is respectively connected to the signal end of the feeding interface through N microstrip feeders, and the microstrip feeders are arranged on the upper surface of the microstrip substrate, and the N microstrip feeders pass through the broken grooves in the middle of the N reflective arrays respectively, and the reflective array is connected to the back metal coating through the metallized vias on the microstrip substrate.

[0010] The director element in each printed Yagi antenna array is located on the side away from the support column; N is 2 and M is 5.

[0011] The middle substrate in each layer of the microstrip antenna is connected to the side surface of the supporting column through the first right-angle connecting piece.

[0012] The intermediate substrate is a square plate, and the microstrip substrate is a rectangular plate with cut corners; in each layer of microstrip antenna, the four sides of the intermediate substrate are respectively connected to one side of the four microstrip substrates; the first through hole in the middle of the intermediate substrate is a regular sixteen-pointed star-shaped through hole, the center of the intermediate substrate coincides with the center of the first through hole, and sixteen second through holes are evenly arranged on the intermediate substrate and located around the first through hole, and the sixteen second through holes are respectively opposite to the vertices of the sixteen corners of the first through hole; the supporting column is a square column, and the four corners of the supporting column are respectively located in the four corners of the first through hole; the vertical surface of the first right-angle connector is connected to the side surface of the supporting column by a first screw, and the horizontal surface of the first right-angle connector is connected to the upper surface or the lower surface of the intermediate substrate by a second screw, and the second screw is installed in the second through hole.

[0013] There is also a horizontal wiring board on the support column, which is located below the first layer of microstrip antenna. There are sixteen wiring terminals on the wiring board. The feeding interfaces on the sixteen Yagi microstrip units are connected to the sixteen wiring terminals through sixteen feeding wires respectively, which is convenient for later assembly.

[0014] A third through hole is provided in the middle of the wiring board, and the support column passes through the third through hole. The wiring board is connected to the side of the support column through a second right-angle connector; the wiring board is a circular disk, and sixteen wiring terminals are evenly distributed around the periphery of the wiring board; a base is provided at the lower end of the support column.

[0015] The third through hole is a square hole, the vertical surface of the second right-angle connector is connected to the side surface of the support column by a third screw, and the horizontal surface of the second right-angle connector is connected to the upper surface or lower surface of the wiring board by a fourth screw.

[0016] The spacing between the four layers of microstrip antennas is the same.

[0017] The support column is made of aluminum alloy profile; the intermediate substrate and the microstrip substrate are both made of epoxy glass cloth laminate, which has good uniformity and thermal conductivity and is little affected by frequency and temperature; the terminal block is made of bakelite, which has high mechanical strength and good insulation, and is heat-resistant and corrosion-resistant; the feed wire is a coaxial cable; the first right-angle connector and the second right-angle connector are made of plastic.

[0018] The center frequency of the four-layer sixteen-microstrip unit Yagi direction-finding antenna is 2450MHz, and the bandwidth is 10MHz. As a directional microstrip antenna, the gain is above 6dB within the working angle of ±20°.

[0019] Beneficial effects of the present invention:

[0020] 1. The present invention applies the theory of Yagi antenna to Yagi microstrip unit. The printed Yagi antenna array in the Yagi microstrip unit contains an excitation array, a guide array and a reflection array, and adopts a parallel feeding structure. The Yagi microstrip unit has good linear polarization broadband characteristics, narrow beam width, high gain and good directivity.

[0021] 2. The present invention adopts a four-layer sixteen-microstrip unit method to implement the microstrip array antenna design, thereby ensuring the maximization of the antenna gain. The sixteen microstrip units ensure 360° all-round coverage of the antenna.

[0022] 3. The first through hole in the middle of the intermediate substrate of each layer of microstrip antenna of the present invention is a regular sixteen-pointed star-shaped through hole, sixteen second through holes are evenly arranged around the first through hole, the intermediate substrate is connected to the side of the support column through a first right-angle connector, the horizontal surface of the first right-angle connector is connected to the upper surface or the lower surface of the intermediate substrate through a second screw, and the second screw is installed in the second through hole; since the central angle between adjacent second through holes is 22.5°, when the intermediate substrate is installed on the support column, the relative rotation angle between each layer of microstrip antennas can be easily maintained at an integer multiple of 22.5°, and the installation is easy and convenient; and the four corners of the square support column are respectively located in the four corners of the first through hole, which can prevent the microstrip antenna from rotating, ensure that the relative rotation angle between each layer of microstrip antennas will not change, and make the performance of the antenna more reliable.

[0023] 4. The Yagi microstrip unit of the present invention is made of a substrate, has a simple structure, and is easy to manufacture and install. (IV) Description of the drawings:

[0024] Figure 1 It is a schematic diagram of the structure of a four-layer sixteen-microstrip unit Yagi direction-finding antenna;

[0025] Figure 2 for Figure 1 A schematic diagram of an enlarged top view of the structure;

[0026] Figure 3 for Figure 2 Schematic diagram of the structure of the fourth layer microstrip antenna;

[0027] Figure 4 for Figure 2 Schematic diagram of the structure of the third layer of microstrip antenna;

[0028] Figure 5 for Figure 2 Schematic diagram of the structure of the second layer of microstrip antenna;

[0029] Figure 6 for Figure 2Schematic diagram of the structure of the first layer of microstrip antenna;

[0030] Figure 7 for Figure 3 The rear view of the fourth layer microstrip antenna;

[0031] Figure 8 for Figure 1 AA section view enlarged structural diagram;

[0032] Fig. 9 for Figure 8 Schematic diagram of the structure of the central wiring board. (V) Specific embodiments:

[0033] See also Figures 1 to 9 In the figure, the four-layer sixteen-microstrip unit Yagi direction-finding antenna includes a vertically arranged support column 5, on which are arranged four layers of microstrip antennas, which have the same shape, and are arranged from bottom to top in the following order: a first-layer microstrip antenna 1, a second-layer microstrip antenna 2, a third-layer microstrip antenna 3, and a fourth-layer microstrip antenna 4; each layer of microstrip antenna contains four identical Yagi microstrip units, which are evenly distributed around the support column 5, and each Yagi microstrip unit contains a horizontally arranged microstrip substrate (1- 2, 2-2, 3-2, 4-2), each microstrip substrate (1-2, 2-2, 3-2, 4-2) is provided with a printed Yagi antenna array; the center line of each layer of microstrip antennas coincides with the center line OO' of the support column 5, and the three projections of the second layer of microstrip antenna 2, the third layer of microstrip antenna 3 and the fourth layer of microstrip antenna 4 on a horizontal plane are rotated 22.5°, 45° and 67.5° around the center line OO' of the support column 5 in a clockwise direction respectively, and then coincide with the projection of the first layer of microstrip antenna 1 on the horizontal plane.

[0034] The four Yagi microstrip units in each layer of the microstrip antenna are connected together through a horizontally arranged intermediate substrate (1-1, 2-1, 3-1, 4-1), a first through hole (1-3, 2-3, 3-3, 4-3) is provided in the middle of the intermediate substrate (1-1, 2-1, 3-1, 4-1), a support column 5 passes through the first through hole (1-3, 2-3, 3-3, 4-3), and the center line of the microstrip antenna passes through the center of the first through hole (1-3, 2-3, 3-3, 4-3). In each layer of microstrip antenna, the intermediate substrate (1-1, 2-1, 3-1, 4-1) and the four microstrip substrates (1-2, 2-2, 3-2, 4-2) are all located on the same horizontal plane, the four microstrip substrates (1-2, 2-2, 3-2, 4-2) are evenly distributed around the intermediate substrate (1-1, 2-1, 3-1, 4-1), and the four microstrip substrates (1-2, 2-2, 3-2, 4-2) are all connected to the intermediate substrate (1-1, 2-1, 3-1, 4-1).

[0035] The intermediate substrate (1-1, 2-1, 3-1, 4-1) and four microstrip substrates (1-2, 2-2, 3-2, 4-2) in each layer of microstrip antenna are an integrated structure.

[0036] Each printed Yagi antenna array contains 2 excitation arrays, 5×2 director arrays (1-6, 2-6, 3-6, 4-6), 2 reflection arrays (1-9, 2-9, 3-9, 4-9) and a feeding interface (1-5, 2-5, 3-5, 4-5). The 5×2 director arrays (1-6, 2-6, 3-6, 4-6) are arranged in a matrix of 3 rows and 2 columns on the upper surface of the microstrip substrate (1-2, 2-2, 3-2, 4-2). The 2 reflection arrays (1-9, 2-9, 3-9, 4-9) are also arranged on the upper surface of the microstrip substrate (1-2, 2-2, 3-2, 4-2); the 2 excitation arrays are respectively arranged on the 2 columns of director arrays (1-6, 2-6, 3-6, 4-6 ), two reflective arrays (1-9, 2-9, 3-9, 4-9) are respectively arranged in front of the two excitation arrays, a feeding interface (1-5, 2-5, 3-5, 4-5) is arranged in front of the two reflective arrays (1-9, 2-9, 3-9, 4-9), a back metal coating (4-12) is provided on the lower surface of the microstrip substrate (1-2, 2-2, 3-2, 4-2) and in the area corresponding to the two reflective arrays (1-9, 2-9, 3-9, 4-9) and the feeding interface (1-5, 2-5, 3-5, 4-5), and the grounding end of the feeding interface (1-5, 2-5, 3-5, 4-5) is connected to the back metal coating (4-12); each excitation array comprises a left part and a right part, a Parts (1-7, 2-7, 3-7, 4-7) are located on the upper surface of the microstrip substrate (1-2, 2-2, 3-2, 4-2), and the other part (4-11) is located on the lower surface of the microstrip substrate (1-2, 2-2, 3-2, 4-2) and connected to the back metal coating (4-12), and the two parts of the excitation array are not connected to each other; a broken groove is opened in the middle of each reflection array (1-9, 2-9, 3-9, 4-9), and the broken groove makes the left and right sides of the reflection array (1-9, 2-9, 3-9, 4-9) disconnected; parts (1-7, 2-7, 3-7, 4-7) of the two excitation arrays on the upper surface of the microstrip substrate (1-2, 2-2, 3-2, 4-2) are connected through two micro The microstrip feeder (1-8, 2-8, 3-8, 4-8) is connected to the signal end of the feeding interface (1-5, 2-5, 3-5, 4-5); the microstrip feeder (1-8, 2-8, 3-8, 4-8) is arranged on the upper surface of the microstrip substrate (1-2, 2-2, 3-2, 4-2); two microstrip feeders (1-8, 2-8, 3-8, 4-8) pass through the broken grooves in the middle of two reflective arrays (1-9, 2-9, 3-9, 4-9) respectively; the reflective arrays (1-9, 2-9, 3-9, 4-9) are connected to the back metal plating layer (4-12) through the metallized through holes (1-10, 2-10, 3-10, 4-10) on the microstrip substrate (1-2, 2-2, 3-2, 4-2).

[0037] The director elements ( 1 - 6 , 2 - 6 , 3 - 6 , 4 - 6 ) in each printed Yagi antenna array are located on a side away from the supporting column 5 .

[0038] The intermediate substrate (1-1, 2-1, 3-1, 4-1) in each layer of the microstrip antenna is connected to the side surface of the support column 5 through the first right-angle connector 6.

[0039] The intermediate substrates (1-1, 2-1, 3-1, 4-1) are square plates, and the microstrip substrates (1-2, 2-2, 3-2, 4-2) are rectangular plates with cut corners. In each layer of the microstrip antenna, the four sides of the intermediate substrates (1-1, 2-1, 3-1, 4-1) are respectively connected to one side of the four microstrip substrates (1-2, 2-2, 3-2, 4-2). The first through hole (1-3, 2-3, 3-3, 4-3) in the middle of the intermediate substrates (1-1, 2-1, 3-1, 4-1) is a regular sixteen-pointed star-shaped through hole, the center of the intermediate substrates (1-1, 2-1, 3-1, 4-1) coincides with the center of the first through hole (1-3, 2-3, 3-3, 4-3), and the first through hole (1-1, 2-1, 3-1, 4-1) is located on the intermediate substrates (1-1, 2-1, 3-1, 4-1). Sixteen second through holes (1-4, 2-4, 3-4, 4-4) are evenly arranged around the intermediate substrate (1-1, 2-1, 3-1, 4-1), and the sixteen second through holes (1-4, 2-4, 3-4, 4-4) are respectively opposite to the vertices of the sixteen corners of the first through holes (1-3, 2-3, 3-3, 4-3); the support column 5 is a square column, and the four corners of the support column 5 are respectively located in the four corners of the first through holes (1-3, 2-3, 3-3, 4-3); the vertical surface of the first right-angle connecting member 6 is connected to the side surface of the support column 5 by a first screw 8, and the horizontal surface of the first right-angle connecting member 6 is connected to the lower surface of the intermediate substrate (1-1, 2-1, 3-1, 4-1) by a second screw 7, and the second screw 7 is installed in the second through holes (1-4, 2-4, 3-4, 4-4).

[0040] A horizontal wiring board 9 is also provided on the support column 5. The wiring board 9 is located below the first layer of microstrip antenna 1. Sixteen wiring terminals 10 are provided on the wiring board 9. The feeding interfaces (1-5, 2-5, 3-5, 4-5) on the sixteen Yagi microstrip units are respectively connected to the sixteen wiring terminals 10 through sixteen feeding wires, which is convenient for later assembly.

[0041] A third through hole 15 is provided in the middle of the wiring board 9, and the support column 5 passes through the third through hole 15. The wiring board 9 is connected to the side of the support column 5 through a second right-angle connector 11; the wiring board 9 is a circular disk, and sixteen wiring terminals 10 are evenly distributed around the periphery of the wiring board 9; a base 12 is provided at the lower end of the support column 5.

[0042] The third through hole 15 is a square hole. The vertical surface of the second right-angle connector 11 is connected to the side surface of the support column 5 by a third screw 14 . The horizontal surface of the second right-angle connector 11 is connected to the upper surface of the wiring board 9 by a fourth screw 13 .

[0043] The spacing between the four layers of microstrip antennas is the same.

[0044] The support column 5 is made of aluminum alloy profile; the intermediate substrate (1-1, 2-1, 3-1, 4-1) and the microstrip substrate (1-2, 2-2, 3-2, 4-2) are all made of epoxy glass cloth laminate, which has good uniformity and thermal conductivity and is little affected by frequency and temperature; the wiring board 9 is made of bakelite, which has high mechanical strength and good insulation, and is heat-resistant and corrosion-resistant; the feed wire is a coaxial cable; the first right-angle connector 6 and the second right-angle connector 11 are made of plastic.

[0045] The center frequency of the four-layer sixteen-microstrip unit Yagi direction-finding antenna is 2450MHz, and the bandwidth is 10MHz. As a directional microstrip antenna, the gain is above 6dB within the working angle of ±20°.

Claims

1. A four-layer sixteen-microstrip unit Yagi direction-finding antenna, characterized in that: The invention comprises a vertically arranged support column, on which four layers of microstrip antennas are arranged, and the four layers of microstrip antennas have the same shape, and are arranged from bottom to top in the following order: a first layer of microstrip antennas, a second layer of microstrip antennas, a third layer of microstrip antennas and a fourth layer of microstrip antennas; each layer of microstrip antennas comprises four identical Yagi microstrip units, and the four Yagi microstrip units are evenly distributed around the support column, and each Yagi microstrip unit comprises a horizontally arranged microstrip substrate, and each microstrip substrate is provided with a printed Yagi antenna array; the center line of each layer of microstrip antennas coincides with the center line of the support column, and three projections of the second layer of microstrip antennas, the third layer of microstrip antennas and the fourth layer of microstrip antennas on a horizontal plane coincide with the projection of the first layer of microstrip antenna on the horizontal plane after being rotated by 22.5°, 45° and 67.5° respectively in the same rotation direction around the center line of the support column.

2. The four-layer sixteen-microstrip unit Yagi direction-finding antenna according to claim 1 is characterized in that: The four Yagi microstrip units in each layer of the microstrip antenna are connected together through a horizontally arranged intermediate substrate, a first through hole is provided in the middle of the intermediate substrate, a support column passes through the first through hole, and a center line of the microstrip antenna passes through the center of the first through hole; in each layer of the microstrip antenna, the intermediate substrate and the four microstrip substrates are all located on the same horizontal plane, the four microstrip substrates are evenly distributed around the intermediate substrate, and the four microstrip substrates are all connected to the intermediate substrate.

3. The four-layer sixteen-microstrip unit Yagi direction-finding antenna according to claim 2 is characterized in that: The middle substrate and the four microstrip substrates in each layer of the microstrip antenna are an integrated structure.

4. The four-layer sixteen-microstrip unit Yagi direction-finding antenna according to claim 1, 2 or 3, characterized in that: Each printed Yagi antenna array comprises N excitation arrays, M×N director arrays, N reflector arrays and a feed interface. The M×N director arrays are arranged in a matrix of M rows and N columns on the upper surface of the microstrip substrate, and the N reflector arrays are also arranged on the upper surface of the microstrip substrate; the N excitation arrays are respectively arranged in front of the N columns of director arrays, the N reflector arrays are respectively arranged in front of the N excitation arrays, and the feed interface is arranged in front of the N reflector arrays. A back metal coating is arranged on the lower surface of the microstrip substrate and in an area corresponding to the N reflector arrays and the feed interface, and a ground terminal of the feed interface is connected to the back metal coating; each An excitation array comprises a left part and a right part, one part is located on the upper surface of the microstrip substrate, and the other part is located on the lower surface of the microstrip substrate and connected to the back metal coating, and the two parts of the excitation array are not connected to each other; a broken groove is opened in the middle of each reflection array, and the broken groove makes the left and right sides of the reflection array disconnected; a part of the N excitation arrays on the upper surface of the microstrip substrate is respectively connected to the signal end of the feeding interface through N microstrip feeders, and the microstrip feeders are arranged on the upper surface of the microstrip substrate, and the N microstrip feeders pass through the broken grooves in the middle of the N reflection arrays respectively, and the reflection array is connected to the back metal coating through the metallized vias on the microstrip substrate.

5. The four-layer sixteen-microstrip unit Yagi direction-finding antenna according to claim 4 is characterized in that: The director element in each printed Yagi antenna array is located on a side away from the supporting column; N is 2, and M is 5.

6. The four-layer sixteen-microstrip unit Yagi direction-finding antenna according to claim 2 or 3, characterized in that: The intermediate substrate in each layer of the microstrip antenna is connected to the side surface of the supporting column through a first right-angle connector.

7. The four-layer sixteen-microstrip unit Yagi direction-finding antenna according to claim 6 is characterized in that: The intermediate substrate is a square plate, and the microstrip substrate is a rectangular plate with cut corners; in each layer of microstrip antenna, the four sides of the intermediate substrate are respectively connected to one side of the four microstrip substrates; the first through hole in the middle of the intermediate substrate is a regular sixteen-pointed star-shaped through hole, the center of the intermediate substrate coincides with the center of the first through hole, and sixteen second through holes are evenly arranged on the intermediate substrate and located around the first through hole, and the sixteen second through holes are respectively opposite to the vertices of the sixteen corners of the first through hole; the supporting column is a square column, and the four corners of the supporting column are respectively located in the four corners of the first through hole; the vertical surface of the first right-angle connector is connected to the side surface of the supporting column by a first screw, and the horizontal surface of the first right-angle connector is connected to the upper surface or the lower surface of the intermediate substrate by a second screw, and the second screw is installed in the second through hole.

8. The four-layer sixteen-microstrip unit Yagi direction-finding antenna according to claim 4 is characterized in that: The support column is also provided with a horizontal wiring board, which is located below the first layer of microstrip antennas. The wiring board is provided with sixteen wiring terminals, and the feeding interfaces on the sixteen Yagi microstrip units are respectively connected to the sixteen wiring terminals through sixteen feeding wires.

9. The four-layer sixteen-microstrip unit Yagi direction-finding antenna according to claim 8, characterized in that: A third through hole is provided in the middle of the wiring board, and the support column passes through the third through hole. The wiring board is connected to the side of the support column through a second right-angle connector; the wiring board is a circular disk, and sixteen wiring terminals are evenly distributed around the periphery of the wiring board; a base is provided at the lower end of the support column.

10. The four-layer sixteen-microstrip unit Yagi direction-finding antenna according to claim 1, characterized in that: The four layers of microstrip antennas have the same spacing between them.

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