Resonant ring and lens structure-based high-gain broadband antenna

Abstract

The invention provides a high-gain broadband antenna based on a resonant ring and lens structure. A main body part of the antenna comprises a bow-tie dipole broadband log-periodic antenna fed by a parallel strip-shaped microstrip line, a lens, a resonant ring, a supporting back plate and a supporting arm. And the lens structure is formed by processing a Teflon material. The top of the parallel strip-shaped microstrip line feed bow tie dipole broadband log-periodic antenna body part is composed of a microstrip line and three bow tie elements with different sizes, and the bottom of the parallel strip-shaped microstrip line feed bow tie dipole broadband log-periodic antenna body part is composed of three bow tie elements which are transited to the microstrip line and have the same size with the top but are symmetrical in direction, wherein the plane conical shape is symmetrical to a quarter circle. The SMA interface on the back is embedded in the center of the supporting backboard, the lens is located at the end-to-end of the feed source antenna, the structure of the lens is composed of a semi-sphere on the top and two cylinders with different radiuses at the bottom of the middle, and the lens is connected with the supporting backboard through the supporting arm. And the resonant ring is located at the tail end of the log-periodic antenna structure. The working frequency band of the antenna ranges from 7.18 GHz to 12.55 GHz, the gain in the frequency range ranges from 11.1 dBi to 16.0 dBi, and the gain is the highest when the frequency is 10.0 GHz. The antenna has the advantages of simple structure, low cost, wide band, high gain and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of antennas, and specifically relates to a high-gain broadband antenna based on a resonant ring and a lens structure. Background Art

[0002] An antenna is an indispensable functional device in the field of wireless communication. Its main function is to complete the mutual conversion between guided waves and free-space waves to achieve information exchange.

[0003] With the rapid development of technology, in current communication systems, the requirements for transmission rate and communication capacity are getting higher and higher, which makes it necessary for antennas to have broadband performance.

[0004] At the same time, gain is an important indicator to measure the radiation performance of an antenna. In the fields of microwave wireless energy transmission and wireless communication, it is required that the antenna has good receiving ability in a certain direction, which requires the antenna to have the characteristic of high gain. Summary of the Invention

[0005] Aiming at the specific requirements for antennas in the communication system and the field of microwave wireless energy transmission, the purpose of the present invention is to propose a high-gain broadband antenna based on a resonant ring and a lens structure. This antenna realizes the broadband characteristic of the antenna by adopting a bow-tie dipole broadband log-periodic antenna structure fed by a parallel strip microstrip line and loading a resonant ring, and realizes the high-gain characteristic of the antenna by adopting a lens structure.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A high-gain broadband antenna based on a resonant ring and a lens structure, which is composed of a bow-tie dipole broadband log-periodic antenna fed by a parallel strip microstrip line, a lens, a resonant ring, a support backplane, and a connecting arm. The top of the main body of the bow-tie dipole broadband log-periodic antenna fed by the parallel strip microstrip line is composed of a microstrip line and three bow-tie elements with different sizes, and the bottom is composed of a quarter-circle symmetric planar cone transitioning to a microstrip line and three bow-tie elements with the same size as the top bow-tie elements but symmetric in direction.

[0008] Furthermore, the lens structure is fabricated using Teflon material, and four cuboids are fabricated at four symmetric positions on the bottom layer of the lens, and a circular groove is opened in the center thereof for connecting to the support backplane through the connecting arm.

[0009] Furthermore, the SMA connector is embedded in the support backplane structure, and then the distance from the center of the lens to the center of the circular groove in the cuboid on its bottom layer is the same. Four circular grooves are opened at the same height on the support backplane, and nylon bolts are used to connect the lens to the support backplane through the connecting arm.

[0010] Further, the resonant rings are eight square double-ring reverse open resonant rings arranged regularly. These resonant rings are printed on the top and bottom of the end of the dielectric substrate respectively.

[0011] The beneficial effects of the present invention adopting the above scheme are as follows:

[0012] By means of the bow-tie dipole broadband log-periodic antenna structure and the loaded resonant rings, the working bandwidth of the antenna is effectively increased and improved. At the same time, the lens structure is adopted to effectively improve the gain of the antenna in the end-fire direction; and it has the advantages of simple structure, low cost, wide frequency band, high gain, etc. Description of the Drawings

[0013] Figure 1 It is the front view of the embodiment of the present invention.

[0014] Figure 2 It is the structure diagram of the support backplane in the embodiment of the present invention.

[0015] Figure 3 It is the structure diagram of the connecting arm in the embodiment of the present invention.

[0016] Figure 4 is the structure diagram of the lens in the embodiment of the present invention.

[0017] Figure 5 is the structure diagram of the microstrip antenna and the resonant rings in the embodiment of the present invention.

[0018] Figure 6 It is the antenna reflection coefficient in the embodiment of the present invention.

[0019] Figure 7 is the radiation pattern of the antenna in the embodiment of the present invention at frequencies of 8.0 GHz, 9.0 GHz, 10.0 GHz, and 11.0 GHz respectively.

[0020] In the figure: 1. Lens, 2. Resonant ring, 3. Connecting arm, 4. Bow-tie dipole broadband log-periodic antenna, 5. Support backplane, 6. SMA interface. Detailed Embodiments

[0021] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0022] In order to clearly illustrate the technical solutions in the embodiments of the present invention, the following will be described through specific specific examples. For the implementation manners of the present invention, those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0023] A high-gain broadband antenna based on a resonant ring and a lens structure, comprising a lens, a bow-tie dipole broadband log-periodic antenna, and a resonant ring. The bow-tie dipole broadband log-periodic antenna is installed in the middle of a support backplane and the lens, and 8 resonant rings with a double-ring reverse open structure are installed at the end of the log-periodic antenna structure.

[0024] For the accuracy and convenience of the scheme implementation, taking the center of the feed port of the log-periodic antenna as the origin of the rectangular coordinate system, the positive direction of the X-axis is along the offset direction of the feed point of the log-periodic antenna, the positive direction of the Y-axis is selected along the direction perpendicular to the parallel microstrip line at the edge of the substrate of the log-periodic antenna, and the central axis of the support backplane structure is the Z-axis with the upward direction as the positive direction.

[0025] Furthermore, the support backplane structure is processed from Teflon material, and its structure is a square plate with a length and width of 40 mm and a thickness of 5 mm. A square groove with a length and width of 14 mm and a height of 1.7 mm is opened in the center, and round grooves with a radius of 3 mm are opened in the four directions of up, down, left, and right at a distance of 34 mm from the center. The parameters of the finally determined support backplane structure are shown in Table 1. Table 1 Parameters of the support backplane structure

[0026] Furthermore, the substrate used for the bow-tie dipole broadband log-periodic antenna fed by a parallel strip microstrip line has a dielectric constant of 2.2, a thickness of 1.6 mm, a length of 50 mm, and a width of 25 mm. The radiation patches are printed on the top and bottom of the substrate. The bow-tie dipole unit is used to replace the traditional dipole rod. The top is fed by a parallel microstrip line and connected to the bow-tie dipole. The width of the microstrip line is 2.3 mm and the length is 40.1 mm. The first bow-tie dipole is located 11.5 mm away from the feed port, which is a right trapezoid with an upper base of 5 mm and a lower base of 10 mm; the second bow-tie dipole is located 26.5 mm away from the feed port, which is a right trapezoid with an upper base of 3.24 mm and a lower base of 6.5 mm; the third bow-tie dipole is located 36.5 mm away from the feed port, which is a right trapezoid with an upper base of 2 mm and a lower base of 4 mm. The bottom is symmetrically tapered from a quarter circle with a radius of 6.3 mm to the microstrip line, and the length is the same as that of the bow-tie dipole structure and the top, but the positions of the bow-tie dipoles are symmetric with respect to the center as the symmetry point. The structure parameters of the finally determined bow-tie dipole broadband log-periodic antenna are shown in Table 2. Table 2 Structure parameters of the bow-tie dipole broadband log-periodic antenna

[0027] Furthermore, the lens structure is a dielectric lens, which is composed of a cylinder with a radius of 30 mm and a height of 15 mm as the bottom, a cylinder with a radius of 28 mm and a height of 15 mm as the middle part, and a semi-sphere with a radius of 18 mm as the top. Four symmetric positions at the bottom are respectively made into cuboids with a length of 15.6 mm, a width of 12 mm, and a height of 5 mm, and a circular groove with a radius of 3 mm is opened at the center of the cuboid, which is placed 2.5 mm away from the end of the lens antenna. The finally determined structural parameters of the lens are shown in Table 3. Table 3 Lens Structural Parameters

[0028] Furthermore, the resonant ring is printed on the upper part of a dielectric substrate with a thickness of 1.6 mm, a length of 50 mm, and a width of 25 mm, and the dielectric constant of the substrate is 2.2. The resonant ring is a double-ring reverse-opening structure. The inner ring has a length and width of 2 mm, a ring width of 0.2 mm, and an opening length of 0.4 mm; the outer ring has a radius of 3.5 mm, a ring width of 0.25 mm, and an opening length of 0.8 mm. The center coordinates of the 8 resonant rings (A1, B1, C1, D1, A2, B2, C2, D2) on the dielectric board are respectively A1(-22 mm, -9 mm, 0 mm), B1(-22 mm, -3 mm, 0 mm), C1(-22 mm, 3 mm, 0 mm), D1(-22 mm, 9 mm, 0 mm), A2(-22 mm, -9 mm, -1.6 mm), B2(-22 mm, -3 mm, -1.6 mm), C2(-22 mm, 3 mm, -1.6 mm), D2(-22 mm, 9 mm, -1.6 mm). The finally determined structural parameters of the resonant ring are shown in Table 4. Table 4 Resonant Ring Structural Parameters

[0029] Furthermore, the connecting arm structure connects the lens and the support backplane. Its structure is a rectangular plate with a length of 52.5 mm, a width of 15.6 mm, and a thickness of 3 mm, and small rectangular plates with a length of 12 mm, a width of 15.6 mm, and a thickness of 3 mm are connected at both ends. A circular groove with a radius of 3 mm is opened 2 mm away from the top on the small rectangle near the lens direction, and a circular groove with a radius of 3 mm is opened 3 mm away from the top on the small rectangle near the support board. The circular grooves on both sides of the connecting arm are respectively connected to the circular grooves of the lens and the support backplane through nylon bolts. The finally determined structural parameters of the connecting arm are shown in Table 5. Table 5 Connecting Arm Structural Parameters

[0030] The support backplane, the bow-tie dipole broadband log-periodic antenna, and the lens are concentric.

[0031] Furthermore, Figure 4 shows the reflection coefficient of this antenna. It can be seen from the figure that the operating frequency of the antenna is 7.18 GHz to 12.55 GHz, and the relative bandwidth is 54.4%.

[0032] Furthermore, Figure 5 shows the radiation patterns of this antenna at frequencies of 8.0 GHz, 9.0 GHz, 10.0 GHz, and 11.0 GHz. It can be seen from the figure that the gain of the antenna within the operating frequency range is 11.1 dBi to 16.0 dBi, and the gain is the highest at a frequency of 10.0 GHz.

[0033] Brief working principle of the present invention:

[0034] In order to achieve the high-gain and wide-bandwidth performance of the antenna, a bow-tie dipole log-periodic antenna is adopted, which effectively improves the operating bandwidth of the antenna. Then, by installing a lens at the end of the antenna, the gain of the antenna is improved; after loading a double-ring reverse-open resonant loop, the operating bandwidth and gain of the antenna are further improved.

Claims

1. A high-gain broadband antenna based on a resonant ring and a lens structure, characterized in that: The main body of the antenna includes a parallel strip microstrip line fed bowtie dipole broadband logarithmic periodic antenna (4), a lens (1), a resonant ring (2), a support back plate (5), and a connecting arm (3). The lens (1) is located at the end of the end-to-end radiation of the logarithmic periodic antenna. The microstrip line fed bowtie dipole broadband logarithmic periodic antenna (4) is located in the middle of the support back plate and the lens, and its top is coaxial with the support back plate and the center of the lens, and the SMA interface connected to its end is embedded in the central part of the support back plate. The resonant ring (2) is located at the top and bottom of the axial end of the logarithmic periodic antenna (4) substrate. The connecting arm (3) connects the lens and the support back plate into a whole in four directions: up, down, left, and right.

2. A high-gain broadband antenna based on a resonant ring and lens structure according to claim 1, characterized in that: The lens (1) is made of Teflon material, and its structure is composed of a cylinder with a radius of 30 mm and a height of 15 mm as the bottom, a cylinder with a radius of 28 mm and a height of 15 mm as the middle part, and a semi-sphere with a radius of 18 mm as the top. Rectangular blocks with a length of 15.6 mm, a width of 5 mm, and a height of 12 mm are respectively made at four symmetrical positions at the bottom of the entire lens (1), and a circular groove with a radius of 3 mm is opened in the center of the rectangular block.

3. The high-gain broadband antenna based on a resonant ring and lens structure according to claim 1, characterized in that: The supporting back plate (5) is made of Teflon material and is a square plate with a length and width of 40 mm and a thickness of 3 mm. A square groove with a length and width of 14 mm and a height of 1.7 mm is opened in the center, and circular grooves with a radius of 3 mm are opened in the four directions of up, down, left and right at a distance of 34 mm from the center.

4. The high-gain broadband antenna based on a resonant ring and lens structure according to claim 1, characterized in that: The connecting arm (5) is made of Teflon material and has a structure of a rectangular plate with a length of 52.5 mm, a width of 15.6 mm and a thickness of 3 mm, and a small rectangular plate with a length of 12 mm, a width of 15.6 mm and a thickness of 3 mm connected at both ends. A circular groove with a radius of 3 mm is opened on the small rectangle near the lens direction at a distance of 2 mm from the top, and a circular groove with a radius of 3 mm is opened on the small rectangle near the support plate at a distance of 3 mm from the top.

5. The high-gain broadband antenna based on a resonant ring and a lens structure according to claim 1, characterized in that: The main body of the parallel strip microstrip line fed bowtie dipole broadband logarithmic periodic antenna (4) is composed of a microstrip line and three bowtie elements of different sizes at the top, and a quarter-circle symmetrical plane cone transitioning to the microstrip line and three bowtie elements of the same size as the top but symmetrical in direction at the bottom.

6. The high-gain broadband antenna based on a resonant ring and lens structure according to claim 1, characterized in that: The dielectric substrate of the parallel strip microstrip line-fed bowtie dipole broadband logarithmic periodic antenna (4) is made of Rogers5880, and the dielectric substrate has a dielectric constant of 2.2, a length of 50 mm, a width of 25 mm, and a thickness of 1.6 mm. There is a microstrip line with a length of 16.3 mm and a width of 2.3 mm at the top and bottom centers of the substrate, and a right-angled trapezoid with an upper base of 5 mm and a lower base of 10 mm is formed on the microstrip line at a distance of 11.5 mm from the end; a right-angled trapezoid with an upper base of 3.24 mm and a lower base of 6.5 mm is formed at a distance of 26.5 mm from the end; and a right-angled trapezoid with an upper base of 2 mm and a lower base of 4 mm is formed at a distance of 36.5 mm from the end.

7. The high-gain broadband antenna based on a resonant ring and lens structure according to claim 1, characterized in that: The resonant ring (2) is printed on a dielectric substrate with a dielectric constant of 2.2, a length of 50 mm, a width of 25 mm, and a thickness of 1.6 mm. The resonant ring (2) is a double-ring reverse opening structure, the length and width of the inner ring are 2 mm, the ring width is 0.2 mm, and the opening length is 0.4 mm; the radius of the outer ring is 3.5 mm, the ring width is 0.25 mm, and the opening length is 0.8 mm.

8. The high-gain broadband antenna based on a resonant ring and lens structure according to claim 1, characterized in that: There are a total of eight double-ring reverse opening structure resonant rings (2), which are distributed at a position 3.5 mm from the end of the dielectric substrate, four at the top and four at the bottom, and the resonant ring (2) at the edge is 1.5 mm away from the edge of the dielectric substrate. The distances between the four resonant rings (2) are all 2 mm.

9. The high-gain broadband antenna based on a resonant ring and lens structure according to claim 1, characterized in that: The lens (1), the bowtie dipole broadband logarithmic periodic antenna (4), and the supporting back plate (5) are concentric.

10. The high-gain broadband antenna based on a resonant ring and a lens structure according to claim 1, characterized in that: The antenna operates in the frequency band of 7.18 GHz to 12.55 GHz.

11. The high-gain broadband antenna based on a resonant ring and lens structure according to claim 1, characterized in that: The gain of the antenna in the working frequency band is 11.1dBi to 16.0dBi, and the gain is maximum at a frequency of 10.0GHz.

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