A large frequency ratio dual frequency antenna

Abstract

The application discloses a large-frequency-ratio dual-frequency antenna, which comprises a dual-mode feeding network and a dual-frequency radiation network. The dual-mode feeding network is a hybrid feeding network based on a dielectric waveguide structure and an SICL structure. The dielectric waveguide structure of the dual-mode feeding network is used for accessing electromagnetic waves in a high-frequency TEM mode and converting the electromagnetic waves in the high-frequency TEM mode into electromagnetic waves in a high-frequency TE10 mode and transmitting the electromagnetic waves in the high-frequency TE10 mode to the dual-frequency radiation network. The SICL structure of the dual-mode feeding network is used for accessing electromagnetic waves in a low-frequency TEM mode and transmitting the electromagnetic waves in the low-frequency TEM mode to the dual-frequency radiation network. The dual-frequency radiation network is used for radiating electromagnetic waves in the TE10 mode and the TEM mode transmitted by the dual-mode feeding network to free space. The large-frequency-ratio dual-frequency antenna has the advantages of realizing a large frequency ratio and being low in profile.

Description

TECHNICAL FIELD

[0001] The present application relates to dual-band antennas, in particular to a large frequency ratio dual-band antenna. BACKGROUND

[0002] With the rapid development of communication technology, spectrum resources become more and more valuable. Although the microwave frequency band is widely used in daily life, it has been unable to meet the current communication demand. The millimeter wave frequency band has the advantages of wide bandwidth, low time delay and high data transmission rate, and also contains more abundant spectrum resources, which has been applied in the field of communication, which to some extent relieves the spectrum pressure. However, at the same time, the millimeter wave frequency band also has the shortcomings of short wavelength and poor diffraction ability, so it cannot completely replace the microwave frequency band. Moreover, the single use of the millimeter wave frequency band cannot meet the requirements of the development of current communication technology, so it is particularly important to design an antenna that works in both microwave frequency band and millimeter wave frequency band. In addition, designing microwave antenna and millimeter wave antenna together can effectively reduce the volume of the antenna, which is more conducive to the application in the communication system.

[0003] Current research finds that when the frequency ratio of the antenna is greater than 3, the antenna design will become complex. The dual-band antenna working in both microwave frequency band and millimeter wave frequency band will have a larger frequency ratio (generally greater than 4), so the design of the dual-band antenna will be more complex and difficult. The existing large frequency ratio antenna is mainly realized by using frequency selective surface (FSS), partial reflecting surface (PRS) and dielectric resonator, but this will inevitably cause the profile of the antenna to be high, which limits its application range in real life. For example, a large frequency ratio dual-band antenna is proposed in the document “Dual-Band Dual-Polarized Shared-Aperture Grid Antenna with Large Frequency Ratio”, which is realized based on PRS structure. The PRS structure has the dual functions of microwave frequency band patch antenna and millimeter wave frequency band PRS, so the large frequency ratio dual-band antenna realizes the effect of large frequency ratio, but the PRS structure has a large size, which leads to the profile height. In addition, the large frequency ratio dual-band antenna uses a pair of orthogonal probes to excite the low frequency band, and a cross-shaped waveguide to excite the high frequency band, wherein the profile height of the cross-shaped waveguide structure is 21mm, which further leads to the increase of the profile height. Finally, the profile height of the large frequency ratio dual-band antenna is 28.254mm, which is too high. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a large frequency ratio dual-band antenna with low profile while realizing large frequency ratio.

[0005] The application adopts the technical scheme for solving the above technical problems: a large frequency ratio dual-frequency antenna, comprising a dual-mode feed network and a dual-frequency radiation network, the dual-mode feed network is a hybrid feed network based on a dielectric waveguide structure and a SICL structure, the dielectric waveguide structure of the dual-mode feed network is used for accessing electromagnetic waves of a high-frequency TEM mode and converting the electromagnetic waves of the high-frequency TEM mode into electromagnetic waves of a high-frequency TE10 mode and transmitting the electromagnetic waves of the high-frequency TE10 mode to the dual-frequency radiation network, the SICL structure of the dual-mode feed network is used for accessing electromagnetic waves of a low-frequency TEM mode and transmitting the electromagnetic waves of the low-frequency TEM mode to the dual-frequency radiation network; the dual-frequency radiation network is used for radiating electromagnetic waves of the TE10 mode and electromagnetic waves of the TEM mode transmitted by the dual-mode feed network to free space.

[0006] The double-mode feeding network comprises a first feeding module and a second feeding module; the first feeding module comprises a first dielectric plate, a second dielectric plate, a first feeding unit, a second feeding unit and a one-to-sixty-four power division network, the first dielectric plate and the second dielectric plate are circular plates with the same radius; the second dielectric plate is located below the first dielectric plate, and the first dielectric plate and the second dielectric plate are coaxially arranged; the first feeding unit and the second feeding unit are circular copper sheets with the same size, the diameter of the first feeding unit and the second feeding unit is smaller than the diameter of the first dielectric plate, the first feeding unit is attached to the upper surface of the first dielectric plate, and the second feeding unit is attached to the lower surface of the second dielectric plate; 64 rectangular slots are formed on the first feeding unit, the upper surface of the first dielectric plate is exposed at the 64 rectangular slots, and the 64 rectangular slots are uniformly arranged in an 8-row-8-column manner to form a slot array; the column direction of the slot array is defined as the left-right direction, the row direction is defined as the front-back direction, the thickness direction of the first dielectric plate is defined as the up-down direction, the long side of each rectangular slot is along the left-right direction, and the short side is along the front-back direction; the one-to-sixty-four power division network is arranged on the first dielectric plate and the second dielectric plate, the one-to-sixty-four power division network is realized by using an SIW structure, has one input end and 64 output ends, the 64 output ends of the one-to-sixty-four power division network correspond to the 64 rectangular slots one by one, and the second feeding module comprises a third feeding unit, a fourth feeding unit and eight fifth feeding units; the third feeding unit is attached to the lower surface of the first dielectric plate; the third feeding unit comprises a first circular copper sheet and two isosceles trapezoidal copper sheets with the same size, which are referred to as a first trapezoidal copper sheet and a second trapezoidal copper sheet; the diameter of the first circular copper sheet is smaller than the radius of the first dielectric plate, the upper base and the lower base of the first trapezoidal copper sheet are along the left-right direction, the lower base of the first trapezoidal copper sheet is located at the rear side of the upper base, the first trapezoidal copper sheet is located at the front side of the first circular copper sheet, the lower base length of the first trapezoidal copper sheet is smaller than the diameter of the first circular copper sheet, the lower base of the first trapezoidal copper sheet is provided with a first arc-shaped groove with a starting end located at the left end and an ending end located at the right end, and the front part of the first circular copper sheet is embedded in the first arc-shaped groove and completely connected with the side wall of the first arc-shaped groove.The second trapezoidal copper sheet is located at the back side of the first circular copper sheet, the upper base and the lower base of the second trapezoidal copper sheet are along the left-right direction, the lower base of the second trapezoidal copper sheet is located at the front side of the upper base, the length of the lower base of the second trapezoidal copper sheet is smaller than the diameter of the first circular copper sheet, the lower base of the second trapezoidal copper sheet is provided with a second arc-shaped groove with the starting end located at the left end and the ending end located at the right end, the back part of the first circular copper sheet is embedded into the second arc-shaped groove and is fully connected with the side wall of the second arc-shaped groove, if the first trapezoidal copper sheet rotates 180 degrees around the central axis of the first circular copper sheet, it will fully coincide with the second trapezoidal copper sheet, the fourth feeding unit is attached to the lower surface of the first dielectric plate, the fourth feeding unit is realized by using a one-to-eight stripline power division network, has one input end and eight output ends, the one-to-eight stripline power division network comprises seven one-to-two stripline power dividers, each one-to-two stripline power divider has one input end and two output ends, the input end of the first one-to-two stripline power divider is used as the input end of the one-to-eight stripline power division network, the two output ends of the first one-to-two stripline power divider are connected with the input end of the second one-to-two stripline power divider and the input end of the third one-to-two stripline power divider in one-to-one correspondence, the two output ends of the second one-to-two stripline power divider are connected with the input end of the fourth one-to-two stripline power divider and the input end of the fifth one-to-two stripline power divider in one-to-one correspondence, the two output ends of the third one-to-two stripline power divider are connected with the input end of the sixth one-to-two stripline power divider and the input end of the seventh one-to-two stripline power divider in one-to-one correspondence, the two output ends of the fourth one-to-two stripline power divider, the two output ends of the fifth one-to-two stripline power divider, the two output ends of the sixth one-to-two stripline power divider and the two output ends of the seventh one-to-two stripline power divider are used as the eight output ends of the one-to-eight stripline power division network, a pair of choke branches is arranged near the two output ends of the first one-to-two stripline power divider, a plurality of spaced metalized through holes are arranged around the fourth feeding unit, the plurality of metalized through holes penetrate the first dielectric plate and the second dielectric plate, and the plurality of metalized through holes are used for preventing energy leakage, each fifth feeding unit is realized by using a "Γ-shaped" stripline, eight fifth feeding units are attached to the lower surface of the first dielectric plate and are uniformly and spacedly arranged along a circle, any fifth feeding unit rotates 45 degrees in the clockwise or counterclockwise direction, and fully coincides with another fifth feeding unit adjacent thereto, when the eight fifth feeding units are projected onto the upper surface of the first dielectric plate, the eight fifth feeding units are distributed around the first feeding unit, and the end of each fifth feeding unit close to the first feeding unit is connected with the outer side of the first feeding unit.Eight output ports of the fourth feeding unit are connected with eight fifth feeding units one by one, the fourth feeding unit and the eight fifth feeding units jointly constitute a low-frequency feeding network, the low-frequency feeding network is in an SICL structure, the first layer dielectric plate, the second layer dielectric plate, the first feeding unit, the second feeding unit, the third feeding unit and the one-to-sixty-four power division network jointly constitute a high-frequency feeding network; the high-frequency feeding network is in a dielectric waveguide structure;

[0007] The double-frequency radiation network comprises a low-frequency radiation network and a high-frequency radiation network, the high-frequency radiation network comprises a third layer of dielectric plate and a first copper-clad layer attached to the upper surface of the third layer of dielectric plate, the third layer of dielectric plate is a circular plate, the diameter of the third layer of dielectric plate is equal to the diameter of the first layer of dielectric plate, the third layer of dielectric plate is located above the first layer of dielectric plate and coaxial with the first layer of dielectric plate, the first copper-clad layer comprises 64 first radiation units arranged in 8 rows and 8 columns in a uniform manner, each first radiation unit is a rectangular copper sheet, the long side direction of the first radiation unit is along the left-right direction, and the width direction of the first radiation unit is along the front-back direction, the 64 first radiation units correspond to 64 rectangular slots one by one in the up-down direction, in a corresponding first radiation unit and a rectangular slot, the center of the first radiation unit and the center of the rectangular slot are on the same straight line perpendicular to the first layer of dielectric plate and the third layer of dielectric plate, the width of the long side of the rectangular slot is smaller than the width of the long side of the first radiation unit, the length of the long side of the rectangular slot is smaller than the length of the long side of the first radiation unit, the low-frequency radiation network comprises eight second radiation units, eight third radiation units, eight fourth radiation units, eight fifth radiation units, eight sixth radiation units, eight seventh radiation units and eight eighth radiation units; the eight second radiation units are uniformly distributed along a circle and surround the outside of the first feeding unit, any second radiation unit is rotated by 45 degrees in the clockwise or counterclockwise direction around the central axis of the first feeding unit, and another second radiation unit adjacent to the second radiation unit is completely overlapped; each second radiation unit is a circular arc copper sheet, the inner arc surface of the eight second radiation units is concentric with the first feeding unit, and the outer arc surface of the eight second radiation units is concentric with the first feeding unit, the eight third radiation units are uniformly distributed along a circle and surround the outside of the first feeding unit, any third radiation unit is rotated by 45 degrees in the clockwise or counterclockwise direction around the central axis of the first feeding unit, and another third radiation unit adjacent to the third radiation unit is completely overlapped; each third radiation unit is a circular arc copper sheet, the inner arc surface of the eight third radiation units is concentric with the first feeding unit, and the outer arc surface of the eight third radiation units is concentric with the first feeding unit, the eight third radiation units correspond to the eight second radiation units one by one, a corresponding third radiation unit is located on the outside of a second radiation unit, and both the third radiation unit and the second radiation unit are symmetrical relative to the same diameter extension line of the first feeding unit; the eight fourth radiation units are uniformly distributed along a circle and surround the outside of the first feeding unit, any fourth radiation unit is rotated by 45 degrees in the clockwise or counterclockwise direction around the central axis of the first feeding unit, and another fourth radiation unit adjacent to the fourth radiation unit is completely overlapped.Each of the fourth radiation units is a circular arc copper sheet, inner arc surfaces of the eight fourth radiation units are concentric with the first feeding unit, outer arc surfaces of the eight fourth radiation units are concentric with the first feeding unit, the eight fourth radiation units correspond to the eight third radiation units one by one, and in the corresponding fourth radiation unit and third radiation unit, the fourth radiation unit is located on the outer side of the third radiation unit, and both are symmetrical relative to the same diameter extension line of the first feeding unit; the eight fifth radiation units are attached to the upper surface of the first layer of medium plates, the eight fifth radiation units are uniformly distributed along a circle and surround the outside of the first feeding unit, and any fifth radiation unit rotates 45 degrees in the clockwise or counterclockwise direction, and another fifth radiation unit adjacent thereto is completely overlapped; the fifth radiation unit is composed of a first rectangular copper sheet, a first circular arc copper sheet and a second circular arc copper sheet, wherein a straight line in a symmetrical relationship of two long sides of the first rectangular copper sheet passes through the center of the first feeding unit, a third arc-shaped groove is formed on the end surface close to the first feeding unit of the first rectangular copper sheet, the first feeding unit is embedded in the third arc-shaped groove and connected with the side wall of the third arc-shaped groove, the first circular arc copper sheet is located on one side of one long side of the first rectangular copper sheet, and the starting end thereof is connected with the long side of the first rectangular copper sheet, the second circular arc copper sheet is located on one side of the ending end of the first circular arc copper sheet, the starting end of the second circular arc copper sheet is connected with the ending end of the first circular arc copper sheet, the inner arc surface of the first circular arc copper sheet is concentric with the first feeding unit, and the outer arc surface of the first circular arc copper sheet is concentric with the first feeding unit, if the second circular arc copper sheet rotates in the clockwise direction with the connection position with the first circular arc copper sheet as the shaft, the first circular arc copper sheet and the second circular arc copper sheet can be concentric, wherein the rotation angle is 0-90 degrees; the eight fifth radiation units are located on the inner side of the eight second radiation units, the eight fifth radiation units correspond to the eight second radiation units one by one, and in the corresponding fifth radiation unit and second radiation unit, the eight sixth radiation units are attached to the lower surface of the second layer of medium plates, the eight sixth radiation units are uniformly distributed along a circle and surround the outside of the first feeding unit, and any sixth radiation unit rotates 45 degrees in the clockwise or counterclockwise direction along the central axis of the first feeding unit, and another sixth radiation unit adjacent thereto is completely overlapped.If eight sixth radiating units are projected onto the upper surface of the first layer of dielectric plates, at this time the eight sixth radiating units correspond to the eight fifth radiating units one by one, and a corresponding one of the sixth radiating units and one of the fifth radiating units are symmetrical with respect to a diameter extension line of the first feeding unit, thus the eight sixth radiating units and the eight fifth radiating units have 8 symmetrical lines, and the 8 symmetrical lines are also the symmetrical lines of the eight second radiating units, the symmetrical lines of the eight third radiating units and the symmetrical lines of the eight fourth radiating units; eight seventh radiating units are attached to the upper surface of the first layer of dielectric plates, the eight seventh radiating units are uniformly distributed along a circle and surround the outside of the first feeding unit, and any one of the seventh radiating units rotates 45 degrees in the clockwise or counterclockwise direction with the central axis of the first feeding unit as the axis, and another one of the seventh radiating units adjacent to it completely coincides; each of the seventh radiating units is a circular arc copper sheet, the eight seventh radiating units and the eight second radiating units are cross-distributed, there is one second radiating unit between every two adjacent seventh radiating units, there is one seventh radiating unit between every two adjacent second radiating units, the distance between any adjacent one of the seventh radiating units and one of the second radiating units is equal, the outer arc surface of the eight seventh radiating units and the first feeding unit have the same center, the inner arc surface of the eight seventh radiating units and the first feeding unit have the same center, eight eighth radiating units are attached to the upper surface of the first layer of dielectric plates, the eight eighth radiating units are uniformly distributed along a circle and surround the outside of the first feeding unit, and any one of the eighth radiating units rotates 45 degrees in the clockwise or counterclockwise direction with the central axis of the first feeding unit as the axis, and another one of the eighth radiating units adjacent to it completely coincides; each of the eighth radiating units is a circular arc copper sheet, the eight eighth radiating units and the eight third radiating units are cross-distributed, there is one third radiating unit between every two adjacent eighth radiating units, there is one eighth radiating unit between every two adjacent third radiating units, the distance between any adjacent one of the eighth radiating units and one of the third radiating units is equal, the outer arc surface of the eight eighth radiating units and the first feeding unit have the same center, the inner arc surface of the eight eighth radiating units and the first feeding unit have the same center, the eight eighth radiating units correspond to the eight seventh radiating units one by one, and in the corresponding one of the eighth radiating units and one of the seventh radiating units, the eighth radiating unit is located on the outside of the seventh radiating unit.

[0008] Compared with the prior art, the advantages of the present application are that the large frequency ratio dual-frequency antenna is composed of a dual-mode feeding network and a dual-frequency radiation network, the dual-mode feeding network is a hybrid feeding network based on a dielectric waveguide structure and a SICL structure, the dielectric waveguide structure of the dual-mode feeding network accesses electromagnetic waves of a high-frequency TEM mode and converts the electromagnetic waves of the high-frequency TEM mode into electromagnetic waves of a high-frequency TE10 mode and transmits the electromagnetic waves of the high-frequency TE10 mode to the dual-frequency radiation network, the SICL structure of the dual-mode feeding network accesses electromagnetic waves of a low-frequency TEM mode and transmits the electromagnetic waves of the low-frequency TEM mode to the dual-frequency radiation network, and the dual-frequency radiation network is used for radiating the electromagnetic waves of the TE10 mode and the electromagnetic waves of the TEM mode transmitted by the dual-mode feeding network to free space, since the dual-mode feeding network is the hybrid feeding network based on the dielectric waveguide structure and the SICL structure, the SICL structure can be built into the dielectric waveguide structure, so that the dual-mode feeding network is small in size and low in profile, and finally the overall antenna structure is low in profile, in addition, the high-frequency signals are transmitted through the dielectric waveguide structure, and the low-frequency signals are transmitted through the SICL structure, the transmission of the high-frequency signals and the low-frequency signals is completely independent and does not interfere with each other, so that a large frequency ratio can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a perspective view of the large frequency ratio dual-frequency antenna of the present application;

[0010] Figure 2 It is an exploded view of the large frequency ratio dual-frequency antenna of the present application;

[0011] Figure 3 It is a structural schematic view of the high-frequency feeding network of the large frequency ratio dual-frequency antenna of the present application;

[0012] Figure 4 It is a structural schematic view of the low-frequency feeding network of the large frequency ratio dual-frequency antenna of the present application;

[0013] Figure 5 It is a structural schematic view of the third feeding unit of the high-frequency feeding network of the large frequency ratio dual-frequency antenna of the present application;

[0014] Figure 6 It is a structural schematic view of the first layer dielectric plate, the second layer dielectric plate and units thereon of the large frequency ratio dual-frequency antenna of the present application;

[0015] Figure 7 It is a structural schematic view of the high-frequency radiation network of the large frequency ratio dual-frequency antenna of the present application;

[0016] Figure 8 It is a structural schematic view of the low-frequency radiation network of the large frequency ratio dual-frequency antenna of the present application;

[0017] Figure 9 It is a low-frequency reflection coefficient and gain diagram of the large frequency ratio dual-frequency antenna of the present application;

[0018] Figure 10 Low frequency normalized pattern of the large frequency ratio dual-band antenna of the present application;

[0019] Figure 11 High frequency reflection coefficient and gain pattern of the large frequency ratio dual-band antenna of the present application;

[0020] Figure 12 High frequency E-plane normalized pattern of the large frequency ratio dual-band antenna of the present application;

[0021] Figure 13 High frequency H-plane normalized pattern of the large frequency ratio dual-band antenna of the present application. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below with reference to the accompanying drawings.

[0023] Embodiment one: a large frequency ratio dual-band antenna, comprising a dual-mode feed network and a dual-band radiation network, the dual-mode feed network is a hybrid feed network based on a dielectric waveguide structure and a SICL structure, the dielectric waveguide structure of the dual-mode feed network is used for accessing electromagnetic waves of TEM mode at high frequency, and converting the electromagnetic waves of TEM mode at high frequency into electromagnetic waves of TE10 mode at high frequency to transmit to the dual-band radiation network, the SICL structure of the dual-mode feed network is used for accessing electromagnetic waves of TEM mode at low frequency, and transmitting the electromagnetic waves of TEM mode at low frequency to the dual-band radiation network; the dual-band radiation network is used for radiating electromagnetic waves of TE10 mode and electromagnetic waves of TEM mode transmitted to it by the dual-mode feed network to free space.

[0024] Embodiment two: this embodiment is basically the same as embodiment one, the difference is that: Figures 1 to 6As shown, in the embodiment, the dual-mode feeding network comprises a first feeding module and a second feeding module; the first feeding module comprises a first layer of dielectric plate 1, a second layer of dielectric plate 2, a first feeding unit 3, a second feeding unit 4 and a one-to-sixty-four power division network 5, the first layer of dielectric plate 1 and the second layer of dielectric plate 2 are circular plates with the same radius; the second layer of dielectric plate 2 is located below the first layer of dielectric plate 1, and the first layer of dielectric plate 1 and the second layer of dielectric plate 2 are coaxially arranged; the first feeding unit 3 and the second feeding unit 4 are circular copper sheets with the same size, the diameter of the first feeding unit 3 and the second feeding unit 4 is smaller than the diameter of the first layer of dielectric plate 1, the first feeding unit 3 is attached to the upper surface of the first layer of dielectric plate 1, and the second feeding unit 4 is attached to the lower surface of the second layer of dielectric plate 2; 64 rectangular slots 6 are formed on the first feeding unit 3, the upper surface of the first layer of dielectric plate 1 is exposed at the 64 rectangular slots 6, and the 64 rectangular slots 6 are uniformly arranged in an 8-row and 8-column manner to form a slot array; the column direction of the slot array is defined as the left-right direction, the row direction is defined as the front-back direction, and the thickness direction of the first layer of dielectric plate 1 is defined as the up-down direction; the long side of each rectangular slot 6 is along the left-right direction, and the wide side is along the front-back direction; the one-to-sixty-four power division network 5 is arranged on the first layer of dielectric plate 1 and the second layer of dielectric plate 2, the one-to-sixty-four power division network 5 is realized by using the SIW structure, has one input end and 64 output ends, and the 64 output ends of the one-to-sixty-four power division network 5 correspond to the 64 rectangular slots 6 one by one; the second feeding module comprises a third feeding unit 7, a fourth feeding unit 8 and eight fifth feeding units 9; the third feeding unit 7 is attached to the lower surface of the first layer of dielectric plate 1; the third feeding unit 7 comprises a first circular copper sheet 71 and two isosceles trapezoidal copper sheets with the same size, which are referred to as a first trapezoidal copper sheet 72 and a second trapezoidal copper sheet 73 respectively; the diameter of the first circular copper sheet 71 is smaller than the radius of the first layer of dielectric plate 1, the upper base and the lower base of the first trapezoidal copper sheet 72 are along the left-right direction, the lower base of the first trapezoidal copper sheet 72 is located at the rear side of the upper base, the first trapezoidal copper sheet 72 is located at the front side of the first circular copper sheet 71, the lower base length of the first trapezoidal copper sheet 72 is smaller than the diameter of the first circular copper sheet 71, the lower base of the first trapezoidal copper sheet 72 is provided with a first arc-shaped groove with the starting end located at the left end and the ending end located at the right end, and the front part of the first circular copper sheet 71 is embedded in the first arc-shaped groove and completely connected with the side wall of the first arc-shaped groove; the second trapezoidal copper sheet 73 is located at the rear side of the first circular copper sheet 71, the upper base and the lower base of the second trapezoidal copper sheet 73 are along the left-right direction, the lower base of the second trapezoidal copper sheet 73 is located at the front side of the upper base, the lower base length of the second trapezoidal copper sheet 73 is smaller than the diameter of the first circular copper sheet 71, the lower base of the second trapezoidal copper sheet 73 is provided with a second arc-shaped groove with the starting end located at the left end and the ending end located at the right end, and the rear part of the first circular copper sheet 71 is embedded in the second arc-shaped groove and completely connected with the side wall of the second arc-shaped groove.If the first trapezoidal copper sheet 72 rotates 180 degrees around the central axis of the first circular copper sheet 71, it will be completely coincided with the second trapezoidal copper sheet 73; the fourth feeding unit 8 is attached to the lower surface of the first layer dielectric sheet 1; the fourth feeding unit 8 is realized by a one-to-eight stripline power division network, which has one input end and eight output ends, and the one-to-eight stripline power division network includes seven one-to-two stripline power dividers, each of which has one input end and two output ends, the input end of the first one-to-two stripline power divider serves as the input end of the one-to-eight stripline power division network, the two output ends of the first one-to-two stripline power divider are connected to the input end of the second one-to-two stripline power divider and the input end of the third one-to-two stripline power divider one by one, the two output ends of the second one-to-two stripline power divider are connected to the input end of the fourth one-to-two stripline power divider and the input end of the fifth one-to-two stripline power divider one by one, the two output ends of the third one-to-two stripline power divider are connected to the input end of the sixth one-to-two stripline power divider and the input end of the seventh one-to-two stripline power divider one by one, the two output ends of the fourth one-to-two stripline power divider, the two output ends of the fifth one-to-two stripline power divider, the two output ends of the sixth one-to-two stripline power divider and the two output ends of the seventh one-to-two stripline power divider, a total of eight output ends, as the eight output ends of the one-to-eight stripline power division network, a pair of choke branches 10 is arranged near the two output ends of the first one-to-two stripline power divider; a plurality of spaced metalized through holes 11 are arranged around the fourth feeding unit 8, the plurality of metalized through holes 11 all penetrate the first layer dielectric sheet 1 and the second layer dielectric sheet 2, and the plurality of metalized through holes 11 are used to prevent energy leakage; each fifth feeding unit 9 is realized by a “Γ-shaped” stripline, and eight fifth feeding units 9 are attached to the lower surface of the first layer dielectric sheet 1 and are uniformly and spaced distributed along a circle, and any one of the fifth feeding units 9 rotates 45 degrees in the clockwise or counterclockwise direction, and another fifth feeding unit 9 adjacent thereto is completely coincided, when the eight fifth feeding units 9 are projected onto the upper surface of the first layer dielectric sheet 1, the eight fifth feeding units 9 will be distributed around the first feeding unit 3, and the end of the eight fifth feeding units 9 close to the first feeding unit 3 will be connected to the outer side of the first feeding unit 3 respectively; the eight output ports of the fourth feeding unit 8 are connected to the eight fifth feeding units 9 one by one, and the fourth feeding unit 8 and the eight fifth feeding units 9 together constitute a low-frequency feeding network, the low-frequency feeding network is of SICL structure, and the first layer dielectric sheet 1, the second layer dielectric sheet 2, the first feeding unit 3, the second feeding unit 4, the third feeding unit 7 and the one-to-sixty-four power division network 5 constitute a high-frequency feeding network; the high-frequency feeding network is of dielectric waveguide structure;

[0025] As Figures 6 to 7As shown, in the embodiment, the dual-frequency radiating network comprises a low-frequency radiating network and a high-frequency radiating network, the high-frequency radiating network comprises a third layer dielectric plate 12 and a first copper-clad layer 13 attached to the upper surface of the third layer dielectric plate 12, the third layer dielectric plate 12 is a circular plate, the diameter of the third layer dielectric plate 12 is equal to the diameter of the first layer dielectric plate 1, the third layer dielectric plate 12 is located above the first layer dielectric plate 1 and coaxial with the first layer dielectric plate 1, the first copper-clad layer 13 comprises 64 first radiating units 14 arranged in a manner of 8 rows and 8 columns and uniformly spaced, each first radiating unit 14 is a rectangular copper sheet, the long side direction of the first radiating unit 14 is along the left-right direction, and the wide side direction is along the front-back direction, the 64 first radiating units 14 correspond to the 64 rectangular slots 6 one by one in the up-down direction, in a corresponding one of the first radiating unit 14 and the rectangular slot 6, the center of the first radiating unit 14 and the center of the rectangular slot 6 are on the same straight line perpendicular to the first layer dielectric plate 1 and the third layer dielectric plate 12, the wide side width of the rectangular slot 6 is less than the wide side width of the first radiating unit 14, and the long side length of the rectangular slot 6 is less than the long side length of the first radiating unit 14, the low-frequency radiating network comprises eight second radiating units 15, eight third radiating units 16, eight fourth radiating units 17, eight fifth radiating units 18, eight sixth radiating units 19, eight seventh radiating units 20 and eight eighth radiating units 21; the eight second radiating units 15 are uniformly distributed along a circle and surround the outside of the first feeding unit 3, any one of the second radiating units 15 rotates 45 degrees along the clockwise or counterclockwise direction with the central axis of the first feeding unit 3 as the axis, and another one of the second radiating units 15 adjacent to it is completely overlapped; each second radiating unit 15 is a circular arc copper sheet, the inner arc surface of the eight second radiating units 15 is concentric with the first feeding unit 3, and the outer arc surface of the eight second radiating units 15 is concentric with the first feeding unit 3; the eight third radiating units 16 are uniformly distributed along a circle and surround the outside of the first feeding unit 3, any one of the third radiating units 16 rotates 45 degrees along the clockwise or counterclockwise direction with the central axis of the first feeding unit 3 as the axis, and another one of the third radiating units 16 adjacent to it is completely overlapped; each third radiating unit 16 is a circular arc copper sheet, the inner arc surface of the eight third radiating units 16 is concentric with the first feeding unit 3, and the outer arc surface of the eight third radiating units 16 is concentric with the first feeding unit 3; the eight third radiating units 16 correspond to the eight second radiating units 15 one by one, in a corresponding one of the third radiating unit 16 and the second radiating unit 15, the third radiating unit 16 is located on the outside of the second radiating unit 15, and both are symmetrical relative to the same diameter extension line of the first feeding unit 3; the eight fourth radiating units 17 are uniformly distributed along a circle and surround the outside of the first feeding unit 3, any one of the fourth radiating units 17 rotates 45 degrees along the clockwise or counterclockwise direction with the central axis of the first feeding unit 3 as the axis, and another one of the fourth radiating units 17 adjacent to it is completely overlapped;Each fourth radiating element 17 is a circular arc copper sheet. The inner arc surface of the eight fourth radiating elements 17 is concentric with the first feeding element 3, and the outer arc surface of the eight fourth radiating elements 17 is concentric with the first feeding element 3. The eight fourth radiating elements 17 correspond to the eight third radiating elements 16 one by one. In the corresponding fourth radiating element 17 and third radiating element 16, the fourth radiating element 17 is located on the outside of the third radiating element 16, and both are symmetrical relative to the same diameter extension line of the first feeding element 3. The eight fifth radiating elements 18 are attached to the upper surface of the first layer of dielectric plates 1. The eight fifth radiating elements 18 are uniformly distributed along a circle and surround the outside of the first feeding element 3. Any fifth radiating element 18 rotates 45 degrees in the clockwise or counterclockwise direction, and another fifth radiating element 18 adjacent thereto is completely overlapped. The fifth radiating element 18 is composed of a first rectangular copper sheet 181, a first circular arc copper sheet 182 and a second circular arc copper sheet 183. The straight line in which the two long sides of the first rectangular copper sheet 181 are in a symmetrical relationship passes through the center of the first feeding element 3. The first rectangular copper sheet 181 is provided with a third arc-shaped recess on the end surface close to the first feeding element 3. The first feeding element 3 is embedded in the third arc-shaped recess and connected with the side wall of the third arc-shaped recess. The first circular arc copper sheet 182 is located on one side of one long side of the first rectangular copper sheet 181, and the starting end thereof is connected with the long side of the first rectangular copper sheet 181. The second circular arc copper sheet is located on one side of the ending end of the first circular arc copper sheet. The starting end of the second circular arc copper sheet and the ending end of the first circular arc copper sheet are connected. The inner arc surface of the first circular arc copper sheet 182 is concentric with the first feeding element 3, and the outer arc surface of the first circular arc copper sheet 182 is concentric with the first feeding element 3. If the second circular arc copper sheet 183 rotates in the clockwise direction with the connection position between the first circular arc copper sheet 182 and the second circular arc copper sheet 183 as the axis, the second circular arc copper sheet 183 can be concentric with the first circular arc copper sheet 182, wherein the rotation angle is 0 degrees to 90 degrees. The eight fifth radiating elements 18 are located on the inside of the eight second radiating elements 15. The eight fifth radiating elements 18 correspond to the eight second radiating elements 15 one by one. In the corresponding fifth radiating element 18 and second radiating element 15, the eight sixth radiating elements 19 are attached to the lower surface of the second layer of dielectric plates 2. The eight sixth radiating elements 19 are uniformly distributed along a circle and surround the outside of the first feeding element 3. Any sixth radiating element 19 rotates 45 degrees in the clockwise or counterclockwise direction along the central axis of the first feeding element 3, and another sixth radiating element 19 adjacent thereto is completely overlapped.If eight sixth radiating units 19 project onto the upper surface of the first layer of dielectric plates 1, at this time, the eight sixth radiating units 19 correspond to the eight fifth radiating units 18 one by one, and a corresponding one of the sixth radiating units 19 and one of the fifth radiating units 18 are symmetrical relative to a diameter extension line of the first feeding unit 3, thus, the eight sixth radiating units 19 and the eight fifth radiating units 18 have 8 lines of symmetry, and the 8 lines of symmetry are also lines of symmetry of the eight second radiating units 15, lines of symmetry of the eight third radiating units 16, and lines of symmetry of the eight fourth radiating units 17; eight seventh radiating units 20 are attached to the upper surface of the first layer of dielectric plates 1, the eight seventh radiating units 20 are uniformly distributed along a circle and surround the outside of the first feeding unit 3, and any one of the seventh radiating units 20 rotates 45 degrees in the clockwise or counterclockwise direction with the central axis of the first feeding unit 3 as the axis, and another one of the seventh radiating units 20 adjacent thereto completely coincides; each of the seventh radiating units 20 is a circular arc copper sheet, the eight seventh radiating units 20 and the eight second radiating units 15 are cross-distributed, there is one second radiating unit 15 between every two adjacent seventh radiating units 20, there is one seventh radiating unit 20 between every two adjacent second radiating units 15, the distance between any adjacent one of the seventh radiating units 20 and one of the second radiating units 15 is equal, the outer arc surface of the eight seventh radiating units 20 has the same center as the first feeding unit 3, the inner arc surface of the eight seventh radiating units 20 has the same center as the first feeding unit 3, eight eighth radiating units 21 are attached to the upper surface of the first layer of dielectric plates 1, the eight eighth radiating units 21 are uniformly distributed along a circle and surround the outside of the first feeding unit 3, and any one of the eighth radiating units 21 rotates 45 degrees in the clockwise or counterclockwise direction with the central axis of the first feeding unit 3 as the axis, and another one of the eighth radiating units 21 adjacent thereto completely coincides; each of the eighth radiating units 21 is a circular arc copper sheet, the eight eighth radiating units 21 and the eight third radiating units 16 are cross-distributed, there is one third radiating unit 16 between every two adjacent eighth radiating units 21, there is one eighth radiating unit 21 between every two adjacent third radiating units 16, the distance between any adjacent one of the eighth radiating units 21 and one of the third radiating units 16 is equal, the outer arc surface of the eight eighth radiating units 21 has the same center as the first feeding unit 3, the inner arc surface of the eight eighth radiating units 21 has the same center as the first feeding unit 3, the eight eighth radiating units 21 correspond to the eight seventh radiating units 20 one by one, and among a corresponding one of the eighth radiating units 21 and one of the seventh radiating units 20, the eighth radiating unit 21 is located on the outside of the seventh radiating unit 20.

[0026] The working principle of the high-ratio dual-band antenna in this embodiment is as follows: The input terminal of the fourth feed unit 8 is connected to the first coaxial feed line, and the third feed unit 7 is connected to the second coaxial feed line. The first coaxial feed line couples low-frequency TEM mode electromagnetic waves to the fourth feed unit 8. The fourth feed unit 8 splits the coupled TEM mode electromagnetic waves into eight paths, which are transmitted one-to-one to eight fifth feed units 9. The eight fifth feed units 9 couple the transmitted TEM mode electromagnetic waves to eight fifth radiating units 18 and eight sixth radiating units 19. The eight fifth radiating units 18 and eight sixth radiating units 19 then couple the coupled TEM mode electromagnetic waves to eight fifth radiating units 18 and eight sixth radiating units 19. Electromagnetic waves radiate into free space. The second coaxial feeder cable couples the high-frequency TEM mode electromagnetic waves to the third feeder unit 7. The third feeder unit 7 converts the high-frequency TEM mode electromagnetic waves into high-frequency TE10 mode electromagnetic waves, which are then transmitted to the input of the 1-to-64 power divider network 5. The 1-to-64 power divider network 5 splits the high-frequency TE10 mode electromagnetic waves into 64 paths, which are then transmitted one-to-one through its 64 outputs to 64 rectangular slots 6. The 64 rectangular slots 6 couple the high-frequency TE10 mode electromagnetic waves transmitted thereto to 64 first radiation units 14. The 64 first radiation units 14 radiate the high-frequency TE10 mode electromagnetic waves into free space. Among them, eight second radiation units 15, eight third radiation units 16, and eight fourth radiation units 17 serve as directional patches, achieving an omnidirectional effect in the horizontal plane and preventing beam tilting up and down, thus achieving better horizontal beam pointing. The eight seventh radiation units 20 and the eight eighth radiation units 21 achieve better omnidirectional radiation effect. The choke branch 10 can reduce the influence of electromagnetic waves in TEM mode on high frequencies and improve the isolation between high and low frequencies.

[0027] To verify the performance of the high-ratio dual-band antenna of the present invention, simulations were performed. The low-frequency reflection coefficient and gain diagram of the high-ratio dual-band antenna of the present invention are shown below. Figure 9 As shown, the low-frequency normalized radiation pattern of the high-ratio dual-band antenna of the present invention is as follows. Figure 10 As shown, the high-frequency reflection coefficient and gain diagram of the high-frequency ratio dual-band antenna of the present invention are as follows. Figure 11 As shown, the high-frequency E-plane normalized radiation pattern of the high-ratio dual-frequency antenna of the present invention is as follows. Figure 12 As shown, the high-frequency H-plane normalized radiation pattern of the high-ratio dual-frequency antenna of the present invention is as follows. Figure 13 As shown. Analysis Figure 9 It can be seen that the high frequency ratio dual-band antenna of the present invention has a reflection coefficient of less than -10dB in the low frequency band of 3-3.6GHz and a small gain fluctuation; analysis Figure 10It can be seen that the high-ratio dual-band antenna of this invention exhibits a relatively regular circle in the normalized radiation pattern at 3.5 GHz, demonstrating good omnidirectional characteristics, with cross-polarization less than -30 dB. Analysis Figure 11 It can be seen that the high-frequency-ratio dual-band antenna of the present invention has a reflection coefficient of less than -10dB in the high-frequency band of 26-29.5GHz, and the gain fluctuation is small; analysis Figure 12 It can be seen that the high frequency ratio dual-band antenna of the present invention exhibits good directional characteristics of the main polarization in the normalized radiation pattern of the E-plane at 28 GHz, and the cross-polarization is less than -30 dB; Analysis Figure 13 It can be seen that the high-ratio dual-band antenna of the present invention exhibits good directional characteristics in the normalized radiation pattern of the H-plane at 28 GHz, with cross-polarization less than -30 dB. Therefore, it can be concluded that the high-ratio dual-band antenna of the present invention achieves a high frequency ratio while reducing the profile through a dual-mode feed network, and achieves omnidirectional radiation at low frequencies and directional radiation at high frequencies.

Claims

1. A large frequency ratio dual frequency antenna, characterized by The application relates to a dual-mode feeding network and a dual-frequency radiation network, wherein the dual-mode feeding network is a hybrid feeding network based on a dielectric waveguide structure and an SICL structure; the dielectric waveguide structure of the dual-mode feeding network is used for accessing high-frequency TEM mode electromagnetic waves and converting the high-frequency TEM mode electromagnetic waves into high-frequency TE10 mode electromagnetic waves which are transmitted to the dual-frequency radiation network; the SICL structure of the dual-mode feeding network is used for accessing low-frequency TEM mode electromagnetic waves and transmitting the low-frequency TEM mode electromagnetic waves to the dual-frequency radiation network; and the dual-frequency radiation network is used for radiating the TE10 mode electromagnetic waves and the TEM mode electromagnetic waves transmitted by the dual-mode feeding network to free space. The double-mode feeding network comprises a first feeding module and a second feeding module; the first feeding module comprises a first dielectric plate, a second dielectric plate, a first feeding unit, a second feeding unit and a one-to-sixty-four power division network, the first dielectric plate and the second dielectric plate are circular plates with the same radius; the second dielectric plate is located below the first dielectric plate, and the first dielectric plate and the second dielectric plate are coaxially arranged; the first feeding unit and the second feeding unit are circular copper sheets with the same size, the diameter of the first feeding unit and the second feeding unit is smaller than the diameter of the first dielectric plate, the first feeding unit is attached to the upper surface of the first dielectric plate, and the second feeding unit is attached to the lower surface of the second dielectric plate; 64 rectangular slots are formed in the first feeding unit, the upper surface of the first dielectric plate is exposed at the 64 rectangular slots, and the 64 rectangular slots are uniformly arranged in an 8-row-8-column manner to form a slot array; the column direction of the slot array is defined as the left-right direction, the row direction is defined as the front-back direction, the thickness direction of the first dielectric plate is defined as the up-down direction, the long side of each rectangular slot is along the left-right direction, and the short side is along the front-back direction; the one-to-sixty-four power division network is arranged on the first dielectric plate and the second dielectric plate, the one-to-sixty-four power division network is realized by using an SIW structure, has one input end and 64 output ends, the 64 output ends of the one-to-sixty-four power division network correspond to the 64 rectangular slots one by one, the second feeding module comprises a third feeding unit, a fourth feeding unit and eight fifth feeding units; the third feeding unit is attached to the lower surface of the first dielectric plate; the third feeding unit comprises a first circular copper sheet and two isosceles trapezoidal copper sheets with the same size, which are referred to as a first trapezoidal copper sheet and a second trapezoidal copper sheet; the diameter of the first circular copper sheet is smaller than the radius of the first dielectric plate, the upper base and the lower base of the first trapezoidal copper sheet are along the left-right direction, the lower base of the first trapezoidal copper sheet is located at the rear side of the upper base, the first trapezoidal copper sheet is located at the front side of the first circular copper sheet, the lower base length of the first trapezoidal copper sheet is smaller than the diameter of the first circular copper sheet, the lower base of the first trapezoidal copper sheet is provided with a first arc-shaped groove with a starting end located at the left end and an ending end located at the right end, and the front part of the first circular copper sheet is embedded in the first arc-shaped groove and completely connected with the side wall of the first arc-shaped groove;The second trapezoidal copper sheet is located behind the first circular copper sheet. Both the upper and lower bases of the second trapezoidal copper sheet are along the left-right direction, with the lower base located in front of the upper base. The length of the lower base of the second trapezoidal copper sheet is less than the diameter of the first circular copper sheet. The lower base of the second trapezoidal copper sheet has a second arc-shaped groove with its starting end at its left end and its ending end at its right end. The rear part of the first circular copper sheet is embedded in the second arc-shaped groove and completely adheres to the sidewall of the second arc-shaped groove. If the first trapezoidal copper sheet wraps around the first circular copper sheet... The central axis of the copper sheet is rotated 180 degrees to completely coincide with the second trapezoidal copper sheet; the fourth power supply unit is attached to the lower surface of the first dielectric substrate; the fourth power supply unit is implemented using a 1-to-8 stripline power divider network, having one input terminal and eight output terminals. The 1-to-8 stripline power divider network includes seven 1-to-2 stripline power dividers, each of which has one input terminal and two output terminals. The input terminal of the first 1-to-2 stripline power divider serves as the input terminal of the 1-to-8 stripline power divider network. The two outputs of the splitter are connected one-to-one with the inputs of the second and third 1-to-2 stripline power splitters. The two outputs of the second 1-to-2 stripline power splitter are connected one-to-one with the inputs of the fourth and fifth 1-to-2 stripline power splitters. The two outputs of the third 1-to-2 stripline power splitter are connected one-to-one with the inputs of the sixth and seventh 1-to-2 stripline power splitters. The two outputs of the fourth 1-to-2 stripline power splitter and the fifth 1-to-2 stripline power splitter... The eight output terminals—two from the first 1-to-2 stripline power divider, two from the sixth 1-to-2 stripline power divider, and two from the seventh 1-to-2 stripline power divider—serve as the eight output terminals of the 1-to-8 stripline power divider network. A pair of choke stubs are respectively located near the two output terminals of the first 1-to-2 stripline power divider. Multiple spaced metallized vias are arranged around the fourth feed unit, penetrating both the first and second dielectric substrates to prevent energy leakage. Each fifth feed unit uses a single… The eight fifth feeding units are respectively attached to the lower surface of the first layer of dielectric plates and are uniformly distributed along a circle, and any one of the fifth feeding units rotates 45 degrees in the clockwise or counterclockwise direction, so that another fifth feeding unit adjacent to the fifth feeding unit is completely overlapped; when the eight fifth feeding units are projected onto the upper surface of the first layer of dielectric plates, the eight fifth feeding units are distributed around the first feeding units, and the end of the fifth feeding unit close to the first feeding unit is connected with the outer side of the first feeding unit; the eight output ports of the fourth feeding unit are connected with the eight fifth feeding units one by one, and the fourth feeding unit and the eight fifth feeding units jointly constitute a low-frequency feeding network, the low-frequency feeding network is an SICL structure, and the first layer of dielectric plates, the second layer of dielectric plates, the first feeding unit, the second feeding unit, the third feeding unit and the one-to-sixty-four power dividing network constitute a high-frequency feeding network; the high-frequency feeding network is a dielectric waveguide structure.

2. A large frequency ratio dual frequency antenna according to claim 1, characterized in that The double-frequency radiation network comprises a low-frequency radiation network and a high-frequency radiation network, the high-frequency radiation network comprises a third layer of dielectric plate and a first copper-clad layer attached to the upper surface of the third layer of dielectric plate, the third layer of dielectric plate is a circular plate, the diameter of the third layer of dielectric plate is equal to the diameter of the first layer of dielectric plate, the third layer of dielectric plate is located above the first layer of dielectric plate and coaxial with the first layer of dielectric plate, the first copper-clad layer comprises 64 first radiation units arranged in 8 rows and 8 columns in a uniform manner, each first radiation unit is a rectangular copper sheet, the long side direction of the first radiation unit is along the left-right direction, and the width direction of the first radiation unit is along the front-back direction, the 64 first radiation units correspond to 64 rectangular slots one by one in the up-down direction, in a corresponding first radiation unit and a rectangular slot, the center of the first radiation unit and the center of the rectangular slot are on the same straight line perpendicular to the first layer of dielectric plate and the third layer of dielectric plate, the width of the long side of the rectangular slot is smaller than the width of the long side of the first radiation unit, the length of the long side of the rectangular slot is smaller than the length of the long side of the first radiation unit, the low-frequency radiation network comprises eight second radiation units, eight third radiation units, eight fourth radiation units, eight fifth radiation units, eight sixth radiation units, eight seventh radiation units and eight eighth radiation units; the eight second radiation units are uniformly distributed along a circle and surround the outside of the first feeding unit, any second radiation unit is rotated by 45 degrees in the clockwise or counterclockwise direction around the central axis of the first feeding unit, and another second radiation unit adjacent to the second radiation unit is completely overlapped; each second radiation unit is a circular arc copper sheet, the inner arc surface of the eight second radiation units is concentric with the first feeding unit, and the outer arc surface of the eight second radiation units is concentric with the first feeding unit, the eight third radiation units are uniformly distributed along a circle and surround the outside of the first feeding unit, any third radiation unit is rotated by 45 degrees in the clockwise or counterclockwise direction around the central axis of the first feeding unit, and another third radiation unit adjacent to the third radiation unit is completely overlapped; each third radiation unit is a circular arc copper sheet, the inner arc surface of the eight third radiation units is concentric with the first feeding unit, and the outer arc surface of the eight third radiation units is concentric with the first feeding unit, the eight third radiation units correspond to the eight second radiation units one by one, a corresponding third radiation unit is located on the outside of a second radiation unit, and both the third radiation unit and the second radiation unit are symmetrical relative to the same diameter extension line of the first feeding unit; the eight fourth radiation units are uniformly distributed along a circle and surround the outside of the first feeding unit, any fourth radiation unit is rotated by 45 degrees in the clockwise or counterclockwise direction around the central axis of the first feeding unit, and another fourth radiation unit adjacent to the fourth radiation unit is completely overlapped.Each of the fourth radiation units is a circular arc copper sheet, inner arc surfaces of the eight fourth radiation units are concentric with the first feeding unit, outer arc surfaces of the eight fourth radiation units are concentric with the first feeding unit, the eight fourth radiation units correspond to the eight third radiation units one by one, and the corresponding fourth radiation unit and the corresponding third radiation unit are located on the outer side of each other and are symmetrical relative to the same diameter extension line of the first feeding unit; the eight fifth radiation units are attached to the upper surface of the first layer of dielectric plates, the eight fifth radiation units are uniformly distributed along a circle and surround the outside of the first feeding unit, and any fifth radiation unit rotates 45 degrees in the clockwise or counterclockwise direction to completely coincide with another fifth radiation unit adjacent thereto; the fifth radiation unit is composed of a first rectangular copper sheet, a first circular arc copper sheet and a second circular arc copper sheet, wherein a straight line in a symmetrical relationship between the two long edges of the first rectangular copper sheet passes through the center of the first feeding unit, a third arc-shaped groove is formed on the end surface close to the first feeding unit of the first rectangular copper sheet, the first feeding unit is embedded in the third arc-shaped groove and is connected with the side wall of the third arc-shaped groove, the first circular arc copper sheet is located on one side of one long edge of the first rectangular copper sheet, and the starting end of the first circular arc copper sheet is connected with the long edge of the first rectangular copper sheet, the second circular arc copper sheet is located on one side of the ending end of the first circular arc copper sheet, the starting end of the second circular arc copper sheet is connected with the ending end of the first circular arc copper sheet, the inner arc surface of the first circular arc copper sheet is concentric with the first feeding unit, and the outer arc surface of the first circular arc copper sheet is concentric with the first feeding unit, and if the second circular arc copper sheet rotates in the clockwise direction with the connection position between the first circular arc copper sheet and the second circular arc copper sheet as the axis, the first circular arc copper sheet and the second circular arc copper sheet are concentric, wherein the rotation angle is 0 degrees to 90 degrees; the eight fifth radiation units are located on the inner side of the eight second radiation units, the eight fifth radiation units correspond to the eight second radiation units one by one, the eight sixth radiation units are attached to the lower surface of the second layer of dielectric plates, the eight sixth radiation units are uniformly distributed along a circle and surround the outside of the first feeding unit, and any sixth radiation unit rotates 45 degrees in the clockwise or counterclockwise direction along the central axis of the first feeding unit to completely coincide with another sixth radiation unit adjacent thereto; if the eight sixth radiation units are projected onto the upper surface of the first layer of dielectric plates, the eight sixth radiation units correspond to the eight fifth radiation units one by one, the corresponding sixth radiation unit and the corresponding fifth radiation unit are symmetrical relative to a diameter extension line of the first feeding unit, and thus the eight sixth radiation units and the eight fifth radiation units have eight symmetrical lines, and the eight symmetrical lines are also the symmetrical lines of the eight second radiation units, the symmetrical lines of the eight third radiation units and the symmetrical lines of the eight fourth radiation units.Eight seventh radiation units are attached to the upper surface of the first layer of dielectric board, eight seventh radiation units are evenly spaced along a circle and surround the outside of the first feeding unit, any one seventh radiation unit rotates 45 degrees in the clockwise or counterclockwise direction with the central axis of the first feeding unit as the axis, and another seventh radiation unit adjacent to it is completely overlapped; each seventh radiation unit is a circular arc copper sheet, eight seventh radiation units and eight second radiation units are cross-distributed, there is one second radiation unit between every two adjacent seventh radiation units, there is one seventh radiation unit between every two adjacent second radiation units, the distance between any adjacent one seventh radiation unit and one second radiation unit is equal, the outer arc surface of eight seventh radiation units and the first feeding unit have the same center, the inner arc surface of eight seventh radiation units and the first feeding unit have the same center, eight eighth radiation units are attached to the upper surface of the first layer of dielectric board, eight eighth radiation units are evenly spaced along a circle and surround the outside of the first feeding unit, any one eighth radiation unit rotates 45 degrees in the clockwise or counterclockwise direction with the central axis of the first feeding unit as the axis, and another eighth radiation unit adjacent to it is completely overlapped; each eighth radiation unit is a circular arc copper sheet, eight eighth radiation units and eight third radiation units are cross-distributed, there is one third radiation unit between every two adjacent eighth radiation units, there is one eighth radiation unit between every two adjacent third radiation units, the distance between any adjacent one eighth radiation unit and one third radiation unit is equal, the outer arc surface of eight eighth radiation units and the first feeding unit have the same center, the inner arc surface of eight eighth radiation units and the first feeding unit have the same center, eight eighth radiation units and eight seventh radiation units correspond one-to-one, among the corresponding one eighth radiation unit and one seventh radiation unit, the eighth radiation unit is located outside the seventh radiation unit.

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