Ultra wide band millimeter wave antenna and array thereof

Abstract

The invention provides an ultra-wideband millimeter wave antenna, which belongs to the field of microwave technology and antenna engineering and comprises a horn radiation cavity, a parasitic patch layer, a radiation patch layer and a feed layer which are sequentially stacked from top to bottom, the metalized via hole arrays in the parasitic patch layer, the radiation patch layer and the feed layer respectively define a first cavity, a second cavity and a third cavity; the horn radiation cavity coincides with the central axes of the first cavity, the second cavity and the third cavity. The parasitic patch is arranged on the upper surface of the parasitic patch layer and is positioned right above the center of the first cavity; the radiation patch is arranged on the upper surface of the radiation patch layer and is positioned right above the center of the second cavity; the metal grounding plate is arranged on the lower surface of the feed layer; the band-ground coplanar waveguide transmission line is arranged on the upper surface of the feed layer and is connected to one end of the strip-shaped feed line through the metalized feed via hole, and the other end of the strip-shaped feed line is connected to the radiation patch; an antenna array is also provided. And dual improvement of bandwidth and gain of the millimeter wave antenna is realized.

Description

Technical Field

[0001] This invention relates to the fields of microwave technology and antenna engineering technology, and in particular to ultra-wideband millimeter-wave antennas and their arrays. Background Technology

[0002] With the continuous development of millimeter-wave technology, high-resolution millimeter-wave radar can obtain more accurate target information in practical applications, attracting increasing attention in terms of application security. As a crucial component of millimeter-wave radar, the performance of the millimeter-wave antenna array directly determines the radar's detection range and resolution.

[0003] Generally, achieving high-resolution detection requires antenna arrays with wide bandwidth, while ensuring sufficient detection range necessitates high gain for antenna elements. However, in traditional millimeter-wave antenna design, ultra-wideband coverage and gain are inherently mutually restrictive: wideband impedance matching structures easily lead to decreased antenna radiation efficiency and gain attenuation; prioritizing gain design significantly compresses antenna bandwidth, making it difficult to simultaneously meet both requirements, especially in the millimeter-wave band. Therefore, designing an antenna and array that can balance ultra-wideband coverage and stable output while being suitable for millimeter-wave applications is essential.

[0004] In the prior art, the Chinese invention patent application CN120280688A, entitled "Base Station Antenna, Millimeter-Wave Base Station Antenna and Millimeter-Wave Isolation Structure," discloses a base station antenna where the main radiating patch on the main radiating layer and the parasitic patch on the parasitic radiating layer can respectively form resonant points and couple, thereby expanding the antenna bandwidth. Its feeding structure and coupling structure on the ground layer both achieve dual-polarization mode through two vertically arranged microstrip slots, enabling simultaneous reception and radiation of signals in two directions (horizontal and vertical), allowing the feed signal to be transmitted and coupled to the main radiating layer more effectively, achieving wide-beam antenna performance. However, this patent application does not consider the problem of the mutual constraint between ultra-wideband and gain. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to achieve a dual improvement in bandwidth and gain of millimeter-wave antennas.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution: an ultra-wideband millimeter-wave antenna, comprising a horn radiating cavity, a parasitic patch layer, a radiating patch layer, and a feed layer stacked sequentially; the metallized via arrays in the parasitic patch layer, the radiating patch layer, and the feed layer respectively form a first cavity, a second cavity, and a third cavity; the central axes of the horn radiating cavity, the first cavity, the second cavity, and the third cavity coincide; The parasitic patch is disposed on the upper surface of the parasitic patch layer and located directly above the center of the first cavity; A radiating patch is disposed on the upper surface of the radiating patch layer and located directly above the center of the second cavity; A metal ground plane is located on the lower surface of the feed layer; A ground coplanar waveguide transmission line is located on the upper surface of the feed layer and connected to one end of a strip feed line through a metallized feed via. The other end of the strip feed line is connected to a radiating patch, and the metallized feed via penetrates the radiating patch layer.

[0007] The parasitic patch layer and the radiating patch layer constitute a double-layer patch structure. The metallized via arrays within the parasitic patch layer, radiating patch layer, and feed layer form the first cavity, second cavity, and third cavity, respectively. The three cavities are aligned at their centers, forming a unified shielding structure. This double-layer patch structure, combined with the shielding structure, achieves ultra-wideband performance. A ground-coplanar waveguide transmission line, metallized feed vias, and strip-shaped feed lines form a Z-shaped stepped vertical feed structure, enabling low-loss vertical signal transmission. By integrating a horn radiating cavity at the top of the antenna, surface wave loss is effectively suppressed and the radiation direction is constrained, significantly improving antenna gain. This results in a synergistic improvement in both bandwidth and gain at the physical level.

[0008] Preferably, the vertical distance between the central axis of the metallized feed via and the central axis of the horn radiating cavity is L, where L = , λ is the wavelength.

[0009] This invention defines the distance between the vertical feed point and the bottom surface of the rectangular horn radiating cavity as: This specific range is not an empirical value, but a key design based on electromagnetic coupling phase optimization. It ensures that the energy excited from the feed point reaches and excites the horn cavity in the optimal phase across the entire wideband generated by the dual-resonance fusion, thereby avoiding sudden drops in gain or pattern distortion caused by frequency changes and guaranteeing the uniformity and reliability of the antenna performance over the ultra-wideband range.

[0010] Preferably, one end of the strip feed line is connected to one end of the metallized feed via through a circular patch, and the other end of the metallized feed via is connected to the end of the grounded coplanar waveguide transmission line through a circular patch.

[0011] Preferably, a rectangular impedance adjustment block is provided on the ground coplanar waveguide transmission line, the rectangular impedance adjustment block being perpendicular to the ground coplanar waveguide transmission line and close to the metallized feed via.

[0012] This invention employs a Z-shaped stepped vertical feed structure, which serves not only as a signal transmission channel but also as a controllable coupled resonant unit. By introducing controllable parasitic inductance and capacitance, coupled with the main radiating patch, it excites and finely tunes a second resonant point within the antenna system. Through optimized design, this resonant point is brought close to and merged with the main resonant point of the radiating patch itself in the frequency domain, thereby extending the traditional narrowband single-resonant response into a continuous broadband impedance-matched characteristic, fundamentally achieving ultra-wideband operation.

[0013] Preferably, the horn radiating cavity, the first cavity, the second cavity, and the third cavity are all rectangular; the inner and outer surfaces of the horn radiating cavity are made of metal and the opening size is adapted to the size of the first cavity.

[0014] Preferably, the metallized via arrays in the parasitic patch layer, the radiating patch layer, and the feed layer are shared.

[0015] Preferably, metallized vias are provided on the parasitic patch layer, the radiating patch layer, and the feed layer, respectively. The metallized vias on the parasitic patch layer are located on both sides of the ground coplanar waveguide transmission line path, and the metallized vias on the radiating patch layer and the feed layer are located on both sides of the strip feed line path, respectively.

[0016] Preferably, the metallized vias are reduced or omitted at the boundary of the first cavity opposite to the strip feed line path.

[0017] This invention also provides an ultra-wideband millimeter-wave antenna array. A series of ultra-wideband millimeter-wave antennas are periodically arranged along a 45-degree angle along the long side of the horn radiating cavity, forming... Linear array, .

[0018] Based on a high-performance ultra-wideband millimeter-wave antenna, this invention proposes an array layout that extends at a 45-degree angle along the long side of a rectangular cavity. Combined with a metallized via array penetrating the periphery of the elements, this forms an effective electromagnetic isolation barrier, greatly reducing inter-element coupling and ensuring isolation during multi-port operation. The entire antenna array uses a three-layer printed circuit board vertically stacked, resulting in a compact structure and high integration of the feed network and radiating elements. This facilitates modular integration with millimeter-wave front-end chips (such as MMICs), providing a high-performance antenna solution for next-generation millimeter-wave radar and high-speed communication systems.

[0019] Preferably, in each ultra-wideband millimeter-wave antenna, the transmission lines connected by the ground-coplanar waveguide transmission lines are curved and of the same length. The power supply transmission line network consisting of several transmission lines has an axisymmetric structure. Attached Figure Description

[0020] Figure 1 A perspective view of an ultra-wideband millimeter-wave antenna provided in an embodiment of the present invention; Figure 2 An exploded view of an ultra-wideband millimeter-wave antenna provided in an embodiment of the present invention; Figure 3 A side view of an ultra-wideband millimeter-wave antenna provided in an embodiment of the present invention; Figure 4 A perspective view of an ultra-wideband millimeter-wave antenna array provided in an embodiment of the present invention; Figure 5 A top view of an ultra-wideband millimeter-wave antenna array provided in an embodiment of the present invention; Figure 6 A schematic diagram of the reflection coefficient of an ultra-wideband millimeter-wave antenna provided in an embodiment of the present invention; Figure 7 A schematic diagram of the standing wave of an ultra-wideband millimeter-wave antenna provided in an embodiment of the present invention; Figure 8 Gain diagram of the ultra-wideband millimeter-wave antenna at 77 GHz provided in this embodiment of the invention; Figure 9 The reflection coefficients of four ports in the ultra-wideband millimeter-wave antenna array provided in this embodiment of the invention; Figures 10(a), 10(b), 10(c), and 10(d) are gain diagrams of four elements in an ultra-wideband millimeter-wave antenna array provided in an embodiment of the present invention at 77 GHz. Figure 11 The isolation of the ultra-wideband millimeter-wave antenna array provided in the embodiments of the present invention; In the figure: 10 Speaker radiating cavity, 20 Parasitic patch layer, 21 First metal layer, 22 Parasitic patch, 30 Radiating patch layer, 31 Second metal layer, 32 Radiating patch, 40 Feed layer, 41 Third metal layer, 50 Metal ground plane, 61 Ground coplanar waveguide transmission line, 611 Rectangular impedance adjustment block, 62 Metallized feed via, 63 Circular patch, 64 Strip feed line, 70 Metallized via array, 71 First metallized via array, 72 Second metallized via array, 73 Third metallized via array, 80 Metallized via. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] like Figures 1 to 3As shown, this embodiment provides an ultra-wideband millimeter-wave antenna, including a horn radiating cavity 10, a parasitic patch layer 20, a parasitic patch 22, a radiating patch layer 30, a radiating patch 32, a feed layer 40, a metal ground plane 50, and a grounded coplanar waveguide transmission line 61. The horn radiating cavity 10, the parasitic patch layer 20, the radiating patch layer 30, and the feed layer 40 are stacked sequentially from top to bottom. The parasitic patch layer 20, the radiating patch layer 30, and the feed layer 40 each adopt a printed circuit board structure. The parasitic patch layer 20 can be made of Rogers 3003 material with a thickness of 0.254 mm, the radiating patch layer 30 can be made of Rogers 4350 material with a thickness of 0.254 mm, and the feed layer 40 can be made of Rogers 3003 material with a thickness of 0.127 mm. The three printed circuit board structures are stacked sequentially from top to bottom and formed into a whole by a pressing process.

[0023] A first metallized via array 71 within the parasitic patch layer 20 forms a first cavity, a second metallized via array 72 within the radiating patch layer 30 forms a second cavity, and a third metallized via array 73 within the feed layer 40 forms a third cavity. (See also...) Figure 2 Alternatively, the parasitic patch layer 20, the radiating patch layer 30, and the feed layer 40 can be stacked together, with the metallized via array 70 penetrating through them. In this embodiment, the parasitic patch layer 20, the radiating patch layer 30, and the feed layer 40 share the metallized via array 70. A first metal layer 21 covers the upper surface of the parasitic patch layer 20, and a second metal layer 31 covers the upper surface of the radiating patch layer 30. The metallized via array 70 sequentially penetrates the parasitic patch layer 20, the second metal layer 31, the radiating patch layer 30, and the feed layer 40. One end of the metallized via array 70 is connected to the first metal layer 21, and the other end is connected to the metal ground plane 50. The first metal layer 21 and the second metal layer 31 can be made of copper with a thickness of 35 μm.

[0024] The central axes of the horn radiating cavity 10, the first cavity, the second cavity, and the third cavity coincide. All three horn radiating cavities are rectangular; the inner and outer surfaces of the horn radiating cavity 10 are made of metal, and its opening size matches the size of the first cavity. In this embodiment, the horn radiating cavity 10 has a cavity height of 1mm, a quadrangular prism structure, chamfered corners on its four side walls, a flat top opening, and its bottom opening is aligned with the first cavity, vertically mounted above it.

[0025] Parasitic patch 22 is disposed on the upper surface of parasitic patch layer 20 and located directly above the center of the first cavity; radiating patch 32 is disposed on the upper surface of radiating patch layer 30 and located directly above the center of the second cavity; parasitic patch 22 is located directly above radiating patch 32. Both parasitic patch 22 and radiating patch 32 are rectangular. In this embodiment, the length of parasitic patch 22 is 0.92 mm and the width is 0.72 mm; radiating patch 32 is slightly larger than the size of parasitic patch 22.

[0026] A metal ground plane 50 is disposed on the lower surface of the feed layer 40; a grounded coplanar waveguide transmission line 61 is disposed on the upper surface of the feed layer 40 and connected to one end of the strip-shaped feed line 64 through a metallized feed via 62. See [reference needed]. Figure 2 One end of the strip-shaped feed line 64 is connected to one end of the metallized feed via 62 via a circular patch 63, and the other end of the metallized feed via 62 is connected to the end of the ground-coplanar waveguide transmission line 61 via a circular patch. The other end of the strip-shaped feed line 64 is connected to the radiating patch 32, and the metallized feed via 62 penetrates the radiating patch layer 30. A third metal layer 41 is also provided on the upper surface of the feed layer 40, and the third metal layer 41 is located on both sides of the ground-coplanar waveguide transmission line 61. In this embodiment, the width of the ground-coplanar waveguide transmission line 61 is set to 0.25 mm, the width of the strip-shaped feed line 64 is set to 0.28 mm, and the end of the metallized feed via 62 connected to the circular patch 63 is located at the center of the circular patch 63.

[0027] A rectangular impedance adjustment block 611 is provided on the ground coplanar waveguide transmission line 61. The rectangular impedance adjustment block 611 is perpendicular to the ground coplanar waveguide transmission line 61 and close to the metallized feed via 62. By setting the rectangular impedance adjustment block 611, the transition performance can be optimized.

[0028] The ground-coplanar waveguide transmission line 61, the metallized feed via 62, and the strip feed line 64 form a Z-shaped stepped vertical feed structure, which not only enables low-loss vertical signal transmission but also actively introduces dual-resonance characteristics into the antenna system, representing an innovative coupling design. In the antenna of this invention, the radiating patch 32 and the underlying metal ground plane 50 constitute the antenna's main resonator, generating the first resonant point. The feed structure, jointly formed by the metallized feed via 62, the circular patch 63, and the rectangular impedance adjustment block 611, couples with the main resonator through its parasitic inductance and capacitance effects, forming the second resonant point.

[0029] By finely adjusting the dimensional parameters of the feed structure (such as via diameter, circular patch radius, and impedance adjustment block width), the frequency of the second resonant point and its coupling state with the first resonant point can be precisely controlled. See also... Figure 6When the above parameters are optimized, the two resonant points are effectively excited and merged within the operating frequency band, exhibiting a continuous and significantly concave broadband response on the reflection coefficient curve, rather than the traditional narrowband single resonant response, thus achieving ultra-wideband impedance matching.

[0030] The parasitic patch layer 20 and the radiating patch layer 30 constitute a double-layer patch structure. The metallized via arrays within the parasitic patch layer 20, the radiating patch layer 30, and the feed layer 40 respectively form the first cavity, the second cavity, and the third cavity. The three cavities are aligned at their centers, forming a unified shielding structure. The double-layer patch structure combined with the shielding structure achieves ultra-wideband performance. By integrating the horn radiating cavity 10 at the top of the antenna, surface wave loss can be effectively suppressed and the radiation direction can be constrained, significantly improving the antenna gain. Thus, at the physical level, a dual improvement in bandwidth and gain is achieved synergistically.

[0031] Metallized vias 80 are provided on the parasitic patch layer 20, the radiating patch layer 30, and the feed layer 40, respectively. The metallized vias 80 on the parasitic patch layer 20 are located on both sides of the path of the ground coplanar waveguide transmission line 61, and the metallized vias 80 on the radiating patch layer 30 and the feed layer 40 are located on both sides of the path of the strip feed line 64, respectively. The metallized vias are reduced or omitted at the boundary of the first cavity facing the path of the strip feed line 64. By reducing or omitting the metallized vias at the boundary of the first cavity facing the path of the strip feed line 64, a feed channel is reserved; by adding metallized vias on both sides of the feed channel, surface waves can be suppressed.

[0032] See Figure 3 The vertical distance between the central axis of the metallized feed via 62 and the central axis of the horn radiating cavity 10 is L, where L = , For example, setting the distance L to 2.7 mm is approximately 0.69 wavelengths. The vertical distance L between the central axis of the metallized feed via 62 and the central axis of the horn radiating cavity 10 is defined as follows: Within a certain range, the electromagnetic coupling phase between the feeding system and the radiating cavity can be optimized, ensuring that energy can be radiated efficiently throughout the entire wideband covered by the dual resonant points, while maintaining the stability of the antenna gain and radiation pattern, ultimately achieving high gain and ultra-wideband characteristics of the antenna elements and array in synergy.

[0033] See Figure 4 and Figure 5 ,Will A series of ultra-wideband millimeter-wave antennas are periodically arranged along a 45-degree angle along the long side of the horn radiating cavity 10, forming... Linear arrays can be used to obtain ultra-wideband millimeter-wave antenna arrays. In this implementation, Choosing 4 means periodically arranging four ultra-wideband millimeter-wave antennas along a 45-degree angle along the long side of the horn radiating cavity 10, forming... Linear array, according to Figure 4 As shown, from left to right, they are antenna 1, antenna 2, antenna 3, and antenna 4, with a vertical distance of 3 mm between the centers of adjacent antennas. In each ultra-wideband millimeter-wave antenna, the transmission lines connected by the ground-coplanar waveguide transmission line 61 are curved and of the same length. The power supply transmission line network consisting of several transmission lines has an axisymmetric structure.

[0034] Simulations of the ultra-wideband millimeter-wave antenna and its array of the present invention show that, for independently operating antenna elements, the impedance bandwidth coverage is wide, such as... Figure 6 As shown, within a wide frequency range of 18.34 GHz from 67.6 GHz to 85.94 GHz, the return loss S11 parameter is less than -10 dB, exhibiting good impedance matching characteristics. The standing wave ratio of the antenna element is as follows: Figure 7 As shown, the standing wave ratio (SWR) is less than 2 within the range of 67.51 GHz to 86.01 GHz; at 77 GHz, the radiation pattern of the antenna element is as follows. Figure 8 As shown, its peak gain reaches 8.67 dBi, demonstrating effective radiation capability.

[0035] The four-element linear array constructed based on this high-performance unit has antennas 1, 2, 3, and 4 corresponding to ports 1, 2, 3, and 4, respectively, with consistent and excellent matching performance across all ports. Specifically, as... Figure 9 As shown, port 1 (S11) satisfies the S-parameter requirement of less than -10dB in the frequency ranges of 67.65-86.28GHz, port 2 (S22) in 67.89-86.26GHz, port 3 (S33) in 67.91-86.13GHz, and port 4 (S44) in 67.8-86.26GHz, ensuring that all ports can be effectively excited. When the four elements are excited individually in sequence, the antenna element gains are shown in Figure 10, reaching 7.57dBi, 7.16dBi, 6.64dBi, and 7dBi respectively. The radiation performance of each element is good and highly consistent, which is beneficial for beamforming and scanning. The isolation between array elements is as follows: Figure 11 Within the operating frequency band, key mutual coupling parameters such as S21, S32, and S43 are lower than -24.6dB, -23.6dB, and -24.7dB, respectively. This high isolation characteristic effectively suppresses mutual interference between units, laying a solid foundation for simultaneous operation of multiple channels.

[0036] This invention achieves ultra-wideband characteristics by using a double-layer patch structure and a rectangular cavity enclosed by metallized vias to form a strong coupling design and generate composite resonance. The metal rectangular horn radiating cavity effectively suppresses surface wave loss and edge diffraction, significantly improving antenna gain. A linear array layout extending along the long side of the rectangular cavity at a 45° angle, combined with a metallized via array design around the radiating elements, significantly reduces mutual coupling between elements and ensures high isolation between ports. The array body adopts a three-layer dielectric substrate vertically stacked structure, coupled with a ground-coplanar waveguide transmission line and a vertically metallized feed via forming a feed system. A vertical transition structure enables efficient and low-loss signal transmission between different layers. A "Z"-shaped stepped feed structure, combined with a rectangular impedance adjustment block to optimize impedance matching, controls the distance between the "Z"-shaped stepped structure and the rectangular horn radiating cavity to approximately [missing information]. ( (Wavelength), further extending the antenna bandwidth. This antenna array has a compact structure and is easy to integrate with millimeter-wave monolithic microwave integrated circuits (MMICs), making it ideal for applications with demanding antenna performance requirements, such as next-generation high-speed communications, automotive radar, and imaging systems.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultra-wideband millimeter-wave antenna, characterized in that: The device includes a speaker radiating cavity (10), a parasitic patch layer (20), a radiating patch layer (30), and a feed layer (40) stacked sequentially from top to bottom; the metallized via arrays in the parasitic patch layer (20), the radiating patch layer (30), and the feed layer (40) respectively form a first cavity, a second cavity, and a third cavity; the central axes of the speaker radiating cavity (10), the first cavity, the second cavity, and the third cavity coincide; Parasitic patch (22) is disposed on the upper surface of parasitic patch layer (20) and located directly above the center of the first cavity; A radiating patch (32) is disposed on the upper surface of the radiating patch layer (30) and located directly above the center of the second cavity; A metal ground plane (50) is disposed on the lower surface of the power supply layer (40); A ground coplanar waveguide transmission line (61) is provided on the upper surface of the feed layer (40) and connected to one end of a strip feed line (64) through a metallized feed via (62). The other end of the strip feed line (64) is connected to a radiating patch (32). The metallized feed via (62) penetrates the radiating patch layer (30).

2. The ultra-wideband millimeter-wave antenna according to claim 1, characterized in that: The vertical distance between the central axis of the metallized feed via (62) and the central axis of the horn radiating cavity (10) is L, where L = , λ is the wavelength.

3. The ultra-wideband millimeter-wave antenna according to claim 1, characterized in that: One end of the strip feed line (64) is connected to one end of the metallized feed via (62) via a circular patch (63), and the other end of the metallized feed via (62) is connected to the end of the grounded coplanar waveguide transmission line (61) via a circular patch.

4. The ultra-wideband millimeter-wave antenna according to claim 1, characterized in that: A rectangular impedance adjustment block (611) is provided on the ground coplanar waveguide transmission line (61). The rectangular impedance adjustment block (611) is perpendicular to the ground coplanar waveguide transmission line (61) and close to the metallized feed via (62).

5. The ultra-wideband millimeter-wave antenna according to claim 1, characterized in that: The horn radiating cavity (10), the first cavity, the second cavity, and the third cavity are all rectangular; the inner and outer surfaces of the horn radiating cavity (10) are made of metal and the opening size is adapted to the size of the first cavity.

6. The ultra-wideband millimeter-wave antenna according to claim 1, characterized in that: The metallized via arrays in the parasitic patch layer (20), the radiating patch layer (30), and the feed layer (40) are shared.

7. The ultra-wideband millimeter-wave antenna according to claim 1, characterized in that: Metallized vias are provided on the parasitic patch layer (20), the radiating patch layer (30), and the feed layer (40). The metallized vias on the parasitic patch layer (20) are located on both sides of the path of the ground coplanar waveguide transmission line (61), and the metallized vias on the radiating patch layer (30) and the feed layer (40) are located on both sides of the path of the strip feed line (64).

8. The ultra-wideband millimeter-wave antenna according to claim 1, characterized in that: The metallized vias are reduced or omitted at the boundary of the first cavity facing the path of the strip feed line (64).

9. An ultra-wideband millimeter-wave antenna array, characterized in that: The ultra-wideband millimeter-wave antennas according to any one of claims 1-8 are periodically arranged along a 45-degree angle direction along the long side of the horn radiating cavity (10), forming Linear array, .

10. The ultra-wideband millimeter-wave antenna array according to claim 9, characterized in that: In each ultra-wideband millimeter-wave antenna, the ground-coplanar waveguide transmission line (61) is connected by a curved transmission line of the same length. The power supply transmission line network consisting of several transmission lines has an axisymmetric structure.

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