Common-aperture antenna for Wifi and millimeter waves

Abstract

Air holes are formed in the middle and the outer side of a plurality of millimeter wave dielectric radiators, and millimeter wave units are embedded through the strengthening effect and the high-order mode suppression effect of the air holes in the center and the air holes in the two sides on a low-frequency polarization electric field. The substrate integrated vertical waveguide, the cascaded resonant cavity and the millimeter wave dielectric radiator are cascaded up and down to solve the problem of shared profile of the large-frequency-ratio common-aperture antenna, and the high-efficiency large-frequency-ratio common-aperture antenna for Wifi and millimeter wave application frequency bands is formed. And the consistency of low-frequency and high-frequency radiation types, cross polarization, overall size, low-frequency and high-frequency radiation efficiency, working bandwidth and isolation can be considered.

Description

Technical Field

[0001] The invention relates to a microwave communication device, in particular to a co-aperture antenna. Background Art

[0002] Wifi antennas and millimeter wave antennas are widely used in indoor communication scenarios, which has led to the demand for co-aperture antennas for Wifi and millimeter waves. The operating frequencies of Wifi and millimeter waves are quite different, that is, the frequencies of millimeter wave antennas and Wifi antennas are relatively high, so the use of co-aperture antennas with a large frequency ratio is conducive to the fusion of the two antennas. At the same time, high-efficiency co-aperture antennas can still maintain a high radiation efficiency after mutual fusion, which is conducive to improving aperture utilization, reducing signal energy loss, and improving communication quality. Therefore, high-efficiency, large-frequency-ratio co-aperture antennas for Wifi and millimeter waves have important application and engineering value.

[0003] At present, there are three main methods to realize high-efficiency, high-frequency ratio co-aperture antennas. The first method uses a diagonally slotted and short-circuited low-frequency omnidirectional radiating patch antenna embedded in an edge-radiating millimeter-wave waveguide slit array to realize a high-radiation efficiency, high-frequency ratio co-aperture antenna for 2.4GHz Wifi and Ku bands, but it cannot take into account both Wifi and millimeter-wave applications, and there are problems such as inconsistent low-frequency and high-frequency radiation types, poor cross-polarization, and large overall size. The second method is to realize a high-efficiency microwave millimeter-wave high-frequency ratio co-aperture antenna by embedding a multi-window metal multi-patch millimeter-wave substrate integrated dielectric resonator array, and obtain consistent low and high-frequency radiation types, but there are problems such as relatively low radiation efficiency of low-frequency antennas and poor millimeter-wave frequency band isolation. The third method is to embed a cross-shaped microwave dielectric antenna with a shared metal wall in a 2Í2 millimeter-wave square dielectric antenna array to realize a high-radiation efficiency microwave millimeter-wave high-frequency ratio co-aperture antenna, but there are problems such as narrow microwave antenna working bandwidth and poor millimeter-wave frequency band isolation. Summary of the invention

[0004] Purpose of the invention: In view of the above-mentioned prior art, a co-aperture antenna for Wifi and millimeter waves is proposed, which can not only be oriented to the application frequency bands of Wifi and millimeter waves, but also take into account the consistency of low-frequency and high-frequency radiation types, cross-polarization, overall size, low-frequency and high-frequency radiation efficiency, working bandwidth, and isolation.

[0005] Technical solution: A co-aperture antenna for Wifi and millimeter waves, including a low-frequency dielectric unit radiator, four millimeter-wave dielectric unit radiators distributed in a 2×2 array are embedded in the center of the low-frequency dielectric unit radiator, a cascade resonant cavity is provided below each millimeter-wave dielectric unit radiator, and a substrate-integrated vertical waveguide is provided below each cascade resonant cavity; a low-frequency signal is fed from a differential microstrip feed line and coupled to the low-frequency dielectric unit radiator, wherein the millimeter-wave signal is coupled and fed into the substrate-integrated vertical waveguide, and then coupled to the millimeter-wave dielectric unit radiator through the cascade resonant cavity, thereby forming Wifi frequency band signal radiation and millimeter-wave frequency band array radiation.

[0006] Furthermore, the common aperture antenna includes a top metal layer, an upper dielectric substrate, a second metal layer, a second dielectric substrate, a third metal layer, a third dielectric substrate, a fourth metal layer, a fourth dielectric substrate, and a fifth metal layer, which are stacked in sequence; The top metal layer includes a rectangular ring metal; in a three-dimensional coordinate system, the long side of the rectangular ring metal is parallel to the y-axis of the three-dimensional coordinate system, and the short side is parallel to the x-axis; the second metal layer includes four first square metals distributed in a 2×2 array, and a first rectangular groove is provided in the center of the first square metal; the third metal layer includes four second square metals respectively overlapping with the first square metals in the z-axis direction, and a second rectangular groove is provided in the center of the second square metal; the fourth metal layer includes a metal ground, two long grooves and four short grooves, wherein the four short grooves are respectively opposite to the second square metals in the z-axis direction, and two long grooves parallel to the x-axis are distributed on both sides of the four short grooves, and gaps are left between adjacent short grooves; the fifth metal layer includes a pair of metal strips respectively orthogonal to the two long grooves; The common-aperture antenna also includes an outer metal wall, an upper metal wall, and a lower metal wall; the outer metal wall is used to connect the rectangular ring metal and the metal ground; the four upper metal walls are used to respectively connect the first square metal and the second square metal; the four lower metal walls are used to respectively connect the second square metal and the metal ground; The upper dielectric substrate, the second dielectric substrate, the third dielectric substrate, the metal ground, the two long slots, the outer metal wall, and the rectangular ring metal constitute the low-frequency dielectric unit radiator; the upper metal wall and the upper dielectric substrate surrounded by it, and the first square metal constitute the millimeter-wave dielectric unit radiator; the upper metal wall and the second dielectric substrate and the second square metal surrounded by it constitute the cascade resonant cavity; the metal strip, the fourth dielectric substrate and the metal ground constitute the differential microstrip feeder; the lower metal wall and the third dielectric substrate and the short slot surrounded by it constitute the substrate-integrated vertical waveguide.

[0007] Furthermore, the common-aperture antenna also includes a central air hole and air holes on both sides; the central air hole and the air holes on both sides penetrate the upper dielectric substrate, the second dielectric substrate, and the third dielectric substrate; the two rows of central air holes arranged parallel to the x-axis are located in the middle of the low-frequency dielectric unit radiator; the air holes on both sides are three rows arranged parallel to the x-axis, and their projections along the z-axis are located between the two long slots and the outer metal wall.

[0008] Furthermore, the common-aperture antenna also includes an upper air hole, and the upper air hole passes through the millimeter-wave dielectric unit radiator and the cascade resonant cavity.

[0009] Furthermore, the fourth dielectric substrate is provided with four rectangular bottom air holes, each of which is directly opposite to a short slot.

[0010] Furthermore, the first rectangular groove and the second rectangular groove overlap each other along the z-axis direction, and the lower metal wall is arranged concentrically with the second rectangular groove and surrounds the second rectangular groove therein.

[0011] Furthermore, the upper air holes include two parts, one part of which is distributed in two circles along the inner side of the upper metal wall, and the other part is located in the first rectangular groove and distributed in a row along the length direction of the rectangular groove.

[0012] Beneficial effects: Existing high-efficiency, high-frequency ratio common-aperture antennas always have one or more problems such as being unable to face Wifi and millimeter wave applications, large overall size, inconsistent low-frequency and high-frequency radiation types, low low-frequency radiation efficiency, narrow low-frequency bandwidth, large cross-polarization, and poor millimeter wave frequency band isolation. The present invention places air holes in the middle and outside of multiple millimeter wave dielectric radiators, and uses the central and two side air holes to enhance the low-frequency polarization electric field and suppress high-order modes to achieve the embedding of millimeter wave units. Combined with the substrate integrated vertical waveguide, cascade resonant cavity and millimeter wave dielectric radiator cascade up and down to solve the shared profile problem of high-frequency ratio common-aperture antennas, a high-efficiency, high-frequency ratio common-aperture antenna for Wifi and millimeter wave application frequency bands is formed, and the consistency of low-frequency and high-frequency radiation types, cross-polarization, overall size, low-frequency and high-frequency radiation efficiency, working bandwidth and isolation are taken into account.

[0013] Specifically, the central air holes and the air holes on both sides penetrate the first to third dielectric layers. The central air holes are arranged in two rows in the middle of the low-frequency dielectric radiator, and the air holes on both sides are arranged in three rows on the outside of the common-aperture radiator. The central air holes can strengthen the electric field component in the main polarization direction during low-frequency operation and reduce the low-frequency quality factor. The air holes on both sides can suppress the high-order modes within the low-frequency operating frequency band to maintain high radiation efficiency. Under the joint action of the central air holes and the air holes on both sides, the millimeter-wave dielectric unit radiator can be smoothly embedded without affecting the operation of the low-frequency unit, forming a large frequency ratio dielectric nested common-aperture radiator.

[0014] The millimeter-wave dielectric radiator, cascade resonant cavity and substrate-integrated vertical waveguide are stacked up and down to solve the shared profile problem of large frequency ratio common-aperture antennas; and the upper air hole runs through the millimeter-wave dielectric radiator and the cascade resonant cavity, thereby enhancing the coupling between the two, adjusting the millimeter-wave input impedance, and maintaining high millimeter-wave radiation efficiency; and the substrate-integrated vertical waveguide has high closure and high-pass characteristics for millimeter-wave signals, thereby improving the isolation between the millimeter-wave port and the low-frequency port.

[0015] The differential microstrip feed line is orthogonal to the long slot and is centrally symmetrically distributed. The combination of the two can excite the TE of the large frequency ratio common aperture dielectric radiator when working at low frequency. 11δ mode, with a good cross-polarization level. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a vertical cross-sectional view of the common aperture antenna of the present invention; Figure 2 It is a horizontal cross-sectional view of the co-aperture antenna of the present invention along the top metal layer; Figure 3 It is a horizontal cross-sectional view of the common aperture antenna of the present invention along the upper dielectric substrate; Figure 4 It is a horizontal cross-sectional view of the co-aperture antenna of the present invention along the second metal layer; Figure 5 It is a horizontal cross-sectional view of the common aperture antenna of the present invention along the second dielectric substrate; Figure 6 It is a horizontal cross-sectional view of the co-aperture antenna of the present invention along the third metal layer; Figure 7 It is a horizontal cross-sectional view of the common aperture antenna of the present invention along the third dielectric substrate; Figure 8 It is a horizontal cross-sectional view of the common aperture antenna of the present invention along the fourth metal layer; Fig. 9 It is a horizontal cross-sectional view of the common aperture antenna of the present invention along the fourth dielectric substrate; Fig.10 It is a horizontal cross-sectional view of the co-aperture antenna of the present invention along the fifth metal layer; Fig.11 The common aperture antenna of the present invention S Parameter and gain simulation results, where (a) is the low frequency band and (b) is the millimeter wave band; Fig.12 The common aperture antenna of the present invention is at a low frequency band (5.96 GHz) E Face to face H Surface radiation pattern, where (a) is E Surface, (b) is H noodle; Fig.13 The common aperture antenna of the present invention is at the millimeter wave frequency band (27.52GHz) E Face to face H Surface radiation pattern, where (a) is E Surface, (b) is H noodle. DETAILED DESCRIPTION

[0017] The present invention will be further explained below in conjunction with the accompanying drawings.

[0018] like Figures 1 to 10 As shown, a high-efficiency, high-frequency ratio, common-aperture antenna for Wifi and millimeter waves includes a top metal layer 1, an upper dielectric substrate 2, a second metal layer 3, a second dielectric substrate 4, a third metal layer 5, a third dielectric substrate 6, a fourth metal layer 7, a fourth dielectric substrate 8, and a fifth metal layer 9, which are stacked in sequence, and also includes an outer metal wall 10, an upper metal wall 11, a lower metal wall 12, an upper air hole 13, a central air hole 14, two side air holes 15, and a bottom air hole 16. Among them, the upper dielectric substrate 2, the second dielectric substrate 4, and the third dielectric substrate 6 have the same dielectric constant, which is greater than the dielectric constant of the fourth dielectric substrate 8.

[0019] like Figure 2 As shown, the top metal layer 1 includes a rectangular ring metal 101. In a three-dimensional coordinate system, the long side of the rectangular ring metal 101 is parallel to the y-axis, and the short side is parallel to the x-axis. The inner long side length of the rectangular ring metal 101 is 0.75λ. 01 -0.79λ 01 , the inner short side length is 0.47λ 01 -0.51λ 01 ,λ 01 is the free space wavelength corresponding to the center frequency of the microwave band.

[0020] like Figure 4 As shown, the second metal layer 3 includes four square metals 301 with rectangular grooves 302 in the center, and the length direction of the rectangular grooves 302 is parallel to the x-axis. The four square metals 301 form a 2×2 array, and the distance between two adjacent square metals 301 above and below and left and right is the same.

[0021] like Figure 6 As shown, the third metal layer 5 includes four square metals 501 with rectangular grooves 502 in the center. The square metals 501 overlap with the square metals 301 in the vertical direction.

[0022] like Figure 8As shown, the fourth metal layer 7 includes a metal ground 701, two long grooves 702 and four short grooves 703. The four short grooves 703 are respectively opposite to the square metal 501 in the vertical direction, and two long grooves 702 parallel to the x-axis are distributed on both sides of the four short grooves 703, and gaps are left between adjacent short grooves 703.

[0023] like Fig.10 As shown, the fifth metal layer 9 includes a pair of metal strips 901. The metal strips 901 are orthogonal to the long grooves 702 and face the middle positions of the two long grooves 702 respectively.

[0024] like Figures 1 to 10 As shown, the outer metal wall 10 vertically penetrates the rectangular ring metal 101 , the upper dielectric substrate 2 , the second dielectric substrate 4 , and the third dielectric substrate 6 , connecting the rectangular ring metal 101 with the metal ground 701 .

[0025] The four upper metal walls 11 vertically penetrate the upper dielectric substrate 2 and the second dielectric substrate 4 respectively, and each upper metal wall 11 surrounds a square metal 301 and a square metal 501 respectively, and is used to connect the square metal 301 and the square metal 501 respectively. The inner side length of the square upper metal wall 11 is 0.08λ 01 -0.11λ 01 , the center distance between adjacent upper metal walls 11 is 0.8λ 02 -0.84λ 02 ,λ 02 is the free space wavelength corresponding to the center frequency of the millimeter wave band.

[0026] The four lower metal walls 12 are respectively located directly below the four square metals 501. The lower metal wall 12 vertically penetrates the fourth dielectric substrate 8, the third dielectric substrate 6 and the third metal 5, and is used to connect the metal ground 701 and each square metal 501. The rectangular lower metal wall 12 is concentrically arranged with the rectangular groove 502 and surrounds the rectangular groove 502 therein; the inner long side length of the lower metal wall 12 is 0.059λ. 01 -0.061λ 01 , the inner short side length is 0.036λ 01 -0.039λ 01 .

[0027] Two rows of central air holes 14 arranged parallel to the x-axis are located in the middle of the four square metals 301 of the 2×2 array, and vertically penetrate the upper dielectric substrate 2, the second dielectric substrate 4, and the third dielectric substrate 6 from the center of the structure.

[0028] The air holes 15 on both sides are arranged in three rows parallel to the x-axis and vertically penetrate the upper dielectric substrate 2 , the second dielectric substrate 4 , and the third dielectric substrate 6 . Their projection along the z-axis is located between the two long grooves 702 and the outer metal wall 10 .

[0029] The upper air holes 13 vertically penetrating the upper dielectric substrate 2, the second metal layer 3, and the second dielectric substrate 4 are divided into two parts, one of which is distributed in two circles along the inner side of the upper metal wall 11, and the other is located in the rectangular groove 302 and distributed in a row along the length direction of the rectangular groove.

[0030] like Fig. 9 As shown, the fourth dielectric substrate 8 is provided with four rectangular bottom air holes 16, each facing a short slot 703. The length of the bottom air hole 16 is 0.059λ 01 -0.061λ 01 , the width is 0.036λ 01 -0.039λ 01 , which is consistent with the size of the short slot 703.

[0031] In the above structure, the upper dielectric substrate 2, the second dielectric substrate 4, the third dielectric substrate 6, the metal ground 701, the two long grooves 702, the outer metal wall 10, the rectangular ring metal 101, the central air hole 14 and the air holes 15 on both sides constitute a low-frequency dielectric unit radiator. The upper metal wall 11 and the upper dielectric substrate 2, the square metal 301, the rectangular groove 302 and the upper air hole 13 surrounded by it constitute a millimeter-wave dielectric unit radiator. The upper metal wall 11 and the second dielectric substrate 4, the square metal 501, the rectangular groove 502 and the upper air hole 13 surrounded by it constitute a cascade resonant cavity of the millimeter-wave dielectric antenna radiator.

[0032] Four millimeter-wave dielectric unit radiators form a 2×2 millimeter-wave array, which is embedded in the center of the low-frequency dielectric unit radiator, and the whole constitutes a high-frequency ratio dielectric nested common-aperture radiator. The metal strip 901, the fourth dielectric substrate 8 and the metal ground 701 constitute the differential microstrip feed line of the low-frequency dielectric unit radiator. The lower metal wall 12 and the third dielectric substrate 6 and the short slot 703 surrounded by it constitute the substrate-integrated vertical waveguide as the feeding structure of the millimeter-wave dielectric unit radiator.

[0033] For the proposed high-efficiency, large-frequency-ratio, co-aperture antenna for Wifi and millimeter waves, the low-frequency signal is fed from the differential microstrip feed line of the low-frequency dielectric unit radiator, coupled to the low-frequency dielectric unit radiator through a pair of long slots on the metal ground, and the millimeter-wave signal is coupled and fed from the substrate integrated vertical waveguide, coupled to the millimeter-wave dielectric unit radiator through the cascade resonant cavity, and under the overall action of the large-frequency-ratio dielectric nested co-aperture radiator, Wifi frequency band signal radiation and millimeter-wave frequency band array radiation are formed.

[0034] In this process, the central air hole can strengthen the electric field component in the main polarization direction during low-frequency operation, thereby avoiding the non-polarized electric field component caused by the traction of the metal wall of the embedded millimeter-wave unit, and at the same time reducing the quality factor of the low-frequency radiator, which is beneficial to improve the cross-polarization level, radiation efficiency and bandwidth of the low-frequency band when the common aperture is used. The air holes on both sides can suppress the high-order modes within the low-frequency working band, thereby maintaining stable radiation efficiency within the low-frequency band when the common aperture is used. Therefore, under the joint action of the central air hole and the air holes on both sides, the millimeter-wave dielectric unit radiator can be smoothly embedded without affecting the operation of the low-frequency unit, forming a large-frequency ratio dielectric nested common-aperture radiator, which can be realized as a whole in the form of substrate integration. In addition, when the large-frequency ratio dielectric nested common-aperture radiator is working, the low-frequency band works in quasi-TE 11δ mode, and is excited by a pair of long slot coupling through a differential microstrip feed line, which can enable the low-frequency radiator to obtain a stable electric field distribution in the main polarization direction when working, suppress the electric field distribution in the cross-polarization direction inside the low-frequency radiator, and further ensure a good cross-polarization level when working in the low-frequency band.

[0035] The upper air hole can enhance the coupling between the millimeter-wave dielectric unit radiator and the cascade resonant cavity, so that the cascade resonant cavity can adjust the input impedance of the substrate integrated vertical waveguide to the millimeter-wave dielectric unit radiator, ensure the input impedance matching of the millimeter-wave dielectric unit, and maintain a high millimeter-wave frequency band radiation efficiency. The millimeter-wave dielectric unit radiator, cascade resonant cavity and substrate integrated vertical waveguide form a stacked structure, which can significantly raise the profile position of the millimeter-wave dielectric unit radiator, thereby ensuring that the low and high frequency radiators can share the profile height when the frequency ratio is large. In addition, the millimeter-wave dielectric unit radiator works at TE 11δ mode, ensuring that the millimeter wave band and the low frequency band have similar radiation patterns. The substrate-integrated vertical waveguide has high closure and high-pass characteristics for millimeter wave signals, thereby improving the isolation between the millimeter wave port and the low frequency port.

[0036] The high-efficiency, high-frequency ratio common-aperture antenna proposed in the present invention has multiple advantages, namely, while facing the Wifi and millimeter-wave application frequency bands, it can also take into account the consistency of low-frequency and high-frequency radiation types, cross-polarization, overall size, low-frequency and high-frequency radiation efficiency, working bandwidth, and isolation. The relative dielectric constants of the two substrates used in this embodiment are 10.2 and 3.55, which is more than 2 times the difference between the two. The electrical size of the common-aperture radiator of the antenna is 0.75λ 01 ×0.47λ 01 ×0.09λ 01 The overall antenna can be realized by multi-layer board technology, and the integration level is high. S The simulation curves of parameters and gains are as follows: Fig.11 As shown, port 1 +and 1 - is the differential feeding port of the low frequency unit, and ports 2, 3, 4, and 5 are the feeding ports of the four millimeter wave units. Fig.11 It can be seen that the low-frequency working band of this case covers 5.77~6.15 GHz, the relative bandwidth is 6.4%, the maximum gain in the working band is 6.87dBi, the radiation efficiency in the working band is 92.3~94.2%, and the isolation of each millimeter wave port to low-frequency signals is greater than 80dB. The millimeter wave array working band covers 26.6 ~ 28.16GHz, the relative bandwidth is 5.7%, the maximum gain in the working band is 13.18 dBi, the radiation efficiency in the working band is 82.6~91%, and the isolation of the low-frequency port to the millimeter wave high-frequency signal is greater than 22.1 dB.

[0037] Fig.12 The antenna is given at the low frequency band of 5.96 GHz. E Face to face H Radiation pattern of the antenna E Face to face H The 3-dB beamwidths of the two planes are 103° and 80.6° respectively. E Face to face H The cross-polarization levels of the two planes are -67 dB and -62 dB respectively. Fig.13 The millimeter wave array at 27.52 GHz is given. E Face to face H Surface radiation pattern, E Face to face H The 3-dB beamwidths of the two planes are 39.6° and 32.3° respectively. E Face to face H The cross-polarization levels of the two planes are -55 dB and -77 dB, and the sidelobe levels are -8.1 dB and -10.1 dB, respectively.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A co-aperture antenna for Wifi and millimeter waves, characterized in that: The invention comprises a low-frequency dielectric unit radiator, four millimeter-wave dielectric unit radiators distributed in a 2×2 array are embedded in the center of the low-frequency dielectric unit radiator, a cascade resonant cavity is arranged below each millimeter-wave dielectric unit radiator, and a substrate-integrated vertical waveguide is arranged below each cascade resonant cavity; a low-frequency signal is fed into and coupled to the low-frequency dielectric unit radiator from a differential microstrip feed line, wherein the millimeter-wave signal is coupled and fed into the substrate-integrated vertical waveguide, and then coupled to the millimeter-wave dielectric unit radiator through the cascade resonant cavity, so as to form Wifi frequency band signal radiation and millimeter-wave frequency band array radiation.

2. The co-aperture antenna for Wifi and millimeter waves according to claim 1, characterized in that: The common aperture antenna comprises a top metal layer (1), an upper dielectric substrate (2), a second metal layer (3), a second dielectric substrate (4), a third metal layer (5), a third dielectric substrate (6), a fourth metal layer (7), a fourth dielectric substrate (8), and a fifth metal layer (9) which are stacked in sequence; The top metal layer (1) includes a rectangular ring metal (101); in a three-dimensional coordinate system, the long side of the rectangular ring metal (101) is parallel to the y-axis of the three-dimensional coordinate system, and the short side is parallel to the x-axis; the second metal layer (3) includes four first square metals (301) distributed in a 2×2 array, and a first rectangular groove (302) is provided in the center of the first square metal (301); the third metal layer (5) includes four second square metals (501) respectively overlapping with the first square metals (301) in the z-axis direction, and the second square metals (501) ) is provided with a second rectangular groove (502) in the center; the fourth metal layer (7) includes a metal ground (701), two long grooves (702) and four short grooves (703), wherein the four short grooves (703) are respectively opposite to the second square metal (501) in the z-axis direction, and two long grooves (702) parallel to the x-axis are distributed on both sides of the four short grooves (703), and gaps are left between adjacent short grooves (703); the fifth metal layer (9) includes a pair of metal strips (901) respectively orthogonal to the two long grooves (702); The common-aperture antenna further comprises an outer metal wall (10), an upper metal wall (11), and a lower metal wall (12); the outer metal wall (10) is used to connect the rectangular ring metal (101) and the metal ground (701); the four upper metal walls (11) are used to respectively connect the first square metal (301) and the second square metal (501); the four lower metal walls (12) are used to respectively connect the second square metal (501) and the metal ground (701); The upper dielectric substrate (2), the second dielectric substrate (4), the third dielectric substrate (6), the metal ground (701), the two long slots (702), the outer metal wall (10), and the rectangular ring metal (101) constitute the low-frequency dielectric unit radiator; the upper metal wall (11) and the upper dielectric substrate (2) and the first square metal (301) surrounded by it constitute the millimeter wave dielectric unit radiator; the upper metal wall (11) and the second dielectric substrate (4) and the second square metal (501) surrounded by it constitute the cascade resonant cavity; the metal strip (901), the fourth dielectric substrate (8) and the metal ground (701) constitute the differential microstrip feeder; and the lower metal wall (12) and the third dielectric substrate (6) and the short slot (703) surrounded by it constitute the substrate integrated vertical waveguide.

3. The co-aperture antenna for Wifi and millimeter waves according to claim 2, characterized in that: The common aperture antenna further comprises a central air hole (14) and two side air holes (15); the central air hole and the two side air holes both penetrate the upper dielectric substrate (2), the second dielectric substrate (4), and the third dielectric substrate (6); two rows of central air holes (14) arranged parallel to the x-axis are located in the middle of the low-frequency dielectric unit radiator; the two side air holes (15) are respectively arranged in three rows parallel to the x-axis, and their projections along the z-axis are located between the two long slots (702) and the outer metal wall (10).

4. The co-aperture antenna for Wifi and millimeter waves according to claim 2 or 3, characterized in that: The common aperture antenna further comprises an upper air hole (13), wherein the upper air hole (13) penetrates the millimeter wave dielectric unit radiator and the cascade resonant cavity.

5. The co-aperture antenna for Wifi and millimeter waves according to claim 2 or 3, characterized in that: The fourth dielectric substrate (8) is provided with four rectangular bottom air holes (16), each facing a short slot (703).

6. The co-aperture antenna for Wifi and millimeter waves according to claim 4, characterized in that: The first rectangular groove (302) and the second rectangular groove (502) overlap each other along the z-axis direction, and the lower metal wall (12) is arranged concentrically with the second rectangular groove (502) and surrounds the second rectangular groove (502) therein.

7. The co-aperture antenna for Wifi and millimeter waves according to claim 6, characterized in that: The upper air holes (13) include two parts, one part of which is distributed in two circles along the inner side of the upper metal wall (11), and the other part is located in the first rectangular groove (302) and distributed in a row along the length direction of the rectangular groove.

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