A two-dimensional substrate integrated waveguide slot antenna array of a corporate-fed network

Abstract

This invention discloses a substrate integrated waveguide slot antenna array with a power divider network, comprising: a substrate; metal layers located on both sides of the substrate; metallized vias penetrating the substrate to achieve electrical connection between the metal layers on both sides of the substrate; a radiating assembly including multiple radiating elements arranged along a first direction; each radiating element including a substrate integrated waveguide double T-junction, two short-circuited SIW cavities, a central slot, and two alternating slot arrays; the two short-circuited SIW cavities and the two alternating slot arrays are symmetrically arranged on both sides of the central slot with the center line of the central slot as the axis of symmetry; each alternating slot array includes multiple longitudinal slots arranged along a second direction, the multiple longitudinal slots being alternately staggered relative to the central slot along the first direction, the second direction being perpendicular to the first direction; and a feeding assembly located at at least one end of the radiating assembly along the first direction. This invention provides a compact antenna array structure, realizing antenna miniaturization and a two-dimensional SIW array power divider network design.

Description

Technical Field

[0001] This invention relates to the field of radio frequency components, and in particular to a substrate integrated waveguide slot antenna array with a power divider network. Background Technology

[0002] With the development of fifth- and sixth-generation mobile communication technologies, antennas, as key radiating devices in microwave and millimeter-wave communication systems, face many new demands and challenges in their design, such as miniaturization and low loss. Substrate-integrated waveguide slot antennas, combining the advantages of planar and rectangular waveguide structures, achieve low loss while maintaining a compact and easily fabricated design, making them commonly used in high-gain and beam-scanning applications.

[0003] However, the beam of traditional substrate integrated waveguide slot antennas can only scan forward or backward with frequency, resulting in a bandgap problem of gain degradation and sharp increase in reflection in the side-firing direction, which greatly limits the application of the beam. Although bandgap suppression can be achieved by loading short-circuit vias or complementary slots near the element radiating slots, these methods often require the introduction of additional vias and slot designs, increasing the overall design complexity. Meanwhile, to achieve higher-gain two-dimensional beams, substrate integrated waveguide slot antenna arrays are often based on large and complex power divider networks, such as multi-channel Y-type power dividers and parabolic reflectors, which leads to a large feed area, hindering antenna miniaturization. A small number of substrate integrated waveguide slot arrays based on multi-layer slot coupling can solve this problem, but still require the introduction of complex slot and feed designs, increasing the overall design complexity and losses of the antenna array. Summary of the Invention

[0004] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a substrate integrated waveguide slot antenna array with a power divider network. The antenna array has a compact structure, achieving antenna miniaturization and the design of a two-dimensional SIW (Substrate Integrated Waveguide) array power divider network.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] In some embodiments, a substrate-integrated waveguide slot antenna array with a power divider network is provided, the antenna array comprising:

[0007] substrate;

[0008] Metal layers are located on both sides of the substrate;

[0009] Metallized vias penetrate the substrate to achieve electrical connection between the metal layers on both sides of the substrate;

[0010] A radiation assembly, the radiation assembly comprising a plurality of radiation elements arranged along a first direction;

[0011] Each of the radiating units includes a substrate integrated waveguide double T-junction, two SIW cavities with short-circuited terminals, a central slot, and two alternating slot arrays;

[0012] The two SIW cavities with short-circuited terminals and the two alternating slot arrays are symmetrically arranged on both sides of the central slot with the center line of the central slot along the first direction as the axis of symmetry.

[0013] Each of the alternating slot arrays includes a plurality of longitudinal slots arranged along a second direction, the plurality of longitudinal slots being alternately offset relative to the central slot along a first direction, the second direction being perpendicular to the first direction;

[0014] A power supply component is located at at least one end of the radiating component along a first direction.

[0015] In some embodiments, each of the alternating slit arrays includes three longitudinal slits arranged along a second direction, and the radiating assembly includes six radiating elements arranged along a first direction.

[0016] In some embodiments, the feeding component is located at both ends of the radiating component along a first direction, including an input port and an output port, wherein the input port and / or the output port includes a substrate integrated waveguide.

[0017] In some embodiments, the input port and / or output port further includes a microstrip transmission line;

[0018] Alternatively, the input ports and / or output ports may also include microstrip transmission lines and microstrip transition lines.

[0019] In some embodiments, the feeding component includes an input port located at one end of the radiating component along a first direction, and the input port includes a microstrip transmission line, a microstrip transition line, and a substrate integrated waveguide;

[0020] The other end of the radiation component opposite to the input port is a short road surface.

[0021] In some embodiments, the short road surface is achieved through metallized vias.

[0022] In some embodiments, the substrate has a dielectric constant of 2.33 and a thickness of 1.35 mm;

[0023] The thickness of the metal layer on each side of the substrate is 35 μm;

[0024] The diameter of the metallized vias is 1.1 mm and the spacing is 1.9 mm.

[0025] In some embodiments, the array period length of the radiating element along the first direction is 25.8 mm;

[0026] The dimensions of the central gap and the longitudinal gap along the second direction are both 15 mm, and the dimensions along the first direction are both 3 mm.

[0027] The center offset of the longitudinal gap relative to the central gap along the first direction is 1 mm;

[0028] The width of the SIW unit structure with each longitudinal slot is 22.8 mm along the second direction, and the width of the T-junction corresponding to each central slot is 22.8 mm.

[0029] In some embodiments, the microstrip transmission line is a 50Ω feed line, the length and width of the microstrip transition line are 9mm and 16mm respectively, and the length of the substrate integrated waveguide is 8.1mm.

[0030] In some embodiments, the antenna array is a leaky wave radiator, covering a frequency of 5.2 GHz to 6.2 GHz, and has a beam scanning angle of -46° to 0°;

[0031] Alternatively, by setting a short-circuit path, maximum radiation in the side-firing direction can be achieved at a frequency of 5.8 GHz, with a maximum gain of not less than 19.6 dBi and an aperture efficiency greater than 80%.

[0032] Compared to existing technologies, the advantages of this invention are as follows: In some embodiments, a high-gain two-dimensional slot antenna array is achieved by periodically loading double T-junctions on both sides of the one-dimensional substrate integrated waveguide transverse slot antenna and connecting them to an equal amount of longitudinal slot substrate integrated waveguide cavities. Based on the overall control of the aperture field distribution of the antenna array by the longitudinal slot substrate integrated waveguide cavity, some embodiments of this invention design a 7×6 (six radiating elements, seven slots (six longitudinal slots + one central slot)) substrate integrated waveguide slot antenna array, realizing side-fire radiation and forward beam scanning. In some embodiments, the coverage frequency is 5.2GHz to 6.2GHz, the beam scanning angle is -46° to 0°, and its side-fire direction has a maximum gain of 19.2dBi. In some embodiments, by setting a short-circuit surface, maximum radiation in the side-fire direction is achieved at a frequency of 5.8GHz, with a maximum gain of not less than 19.6dBi and an aperture efficiency of 80%. In some embodiments of the present invention, the antenna array structure is compact, and a simple microstrip line feed is used to achieve antenna miniaturization and two-dimensional SIW array power divider network design. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of a substrate-integrated waveguide slot antenna array with a power divider network according to some embodiments of the present invention.

[0034] Figure 2 This is a schematic diagram of the overall structural dimensions of a substrate-integrated waveguide slot antenna array with a power divider network according to some embodiments of the present invention.

[0035] Figure 3 This is a schematic diagram of the structure of a radiating element of an antenna array according to some embodiments of the present invention.

[0036] Figure 4 This is a schematic diagram of the substrate integrated waveguide slot antenna array of the power divider network according to some embodiments of the present invention.

[0037] Figure 5 This is a schematic diagram of the overall structure of a substrate-integrated waveguide slot antenna array with a power divider network according to some embodiments of the present invention.

[0038] Figure 6 This is a schematic diagram of the feeding components and center slot of the antenna array in some embodiments of the present invention.

[0039] Figure 7 The image shows a physical diagram of a substrate-integrated waveguide slot antenna array with a power divider network according to some embodiments of the present invention.

[0040] Figure 8 This is a schematic diagram illustrating the working principle of a substrate-integrated waveguide slot antenna array with a power divider network according to some embodiments of the present invention.

[0041] Figure 9 This is a diagram showing the aperture electric field distribution of an antenna radiating element in some embodiments of the present invention.

[0042] Figure 10 The images show the E-plane radiation patterns of antenna arrays at different frequencies according to some embodiments of the present invention.

[0043] Figure 11 The above are H-plane radiation patterns of antenna arrays at different frequencies according to some embodiments of the present invention.

[0044] Figure 12 These are the radiation parameters of the antenna arrays in some embodiments of the present invention.

[0045] Figure 13 This invention provides simulation and measurement of the reflection coefficient of antenna arrays in some embodiments of the present invention.

[0046] Figure 14 The above describes the E-plane radiation pattern of an antenna array according to some embodiments of the present invention at a frequency of 5.8 GHz.

[0047] Figure 15 The above describes the H-plane radiation pattern of an antenna array according to some embodiments of the present invention at a frequency of 5.8 GHz. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] Figure 1 This is a schematic diagram of the overall structure of a substrate-integrated waveguide slot antenna array with a power divider network according to some embodiments of the present invention. Figure 2 This is a schematic diagram of the overall structural dimensions of a substrate-integrated waveguide slot antenna array with a power divider network according to some embodiments of the present invention.

[0051] refer to Figure 1 and Figure 2 In some embodiments, the substrate integrated waveguide slot antenna array of the power divider network includes: a substrate 10, a metal layer 20, a metallized via 30, a radiating component 40, and a feeding component 50.

[0052] Metal layers 20 are located on both sides of the substrate 10. Metallized vias 30 penetrate the substrate 10, enabling electrical connection between the metal layers 20 on both sides of the substrate 10. In some embodiments, the substrate 10 has a dielectric constant of 2.33 and a thickness of 1.35 mm. The thickness of the metal layer 20 on each side of the substrate is 35 μm. In some embodiments, the substrate-integrated waveguide slot antenna array uses F4BM board (a high-performance printed circuit board (PCB) material based on polytetrafluoroethylene (PTFE)) as the dielectric substrate 10, and the diameter d of the metallized vias 30 is 1.1 mm, and the spacing s is 1.9 mm.

[0053] The radiating assembly 40 includes a plurality of radiating elements 41 arranged along a first direction. Each radiating element 41 includes a substrate integrated waveguide double T-junction 412, two short-circuited SIW (Substrate Integrated Waveguide) cavities 413, a central slot 414, and two alternating slot arrays 415. The substrate integrated waveguide double T-junction is of type HT. A T-junction means that a port is opened vertically on one side of the waveguide to connect to the SIW structure, with the branch waveguide perpendicular to the main waveguide direction. A double T-junction means that a vertical port is opened on both sides of the waveguide, each port connecting to a short-circuited SIW cavity. The HT type defines the two opening positions, with the branch plane parallel to the plane containing the magnetic field. The two short-circuited SIW cavities 413 correspond to the substrate integrated waveguide double T-junction 412, and the two alternating slot arrays 415 are correspondingly disposed within the two short-circuited SIW cavities 413. In some embodiments, the radiating assembly 40 includes six radiating elements 41 arranged along the first direction. In some embodiments, the radiating component 40 comprises six radiating elements 41 arranged along a first direction. In some embodiments, the array period length p of the radiating elements 41 along the first direction is 25.8 mm. Figure 1 In the illustrated embodiment, the radiating assembly 40 has six radiating elements 41 arranged along a first direction. Each radiating element 41 has a central slit 414. Figure 1 In the embodiment shown, the radiating assembly 40 has six central slits 414.

[0054] The power supply component 50 is located at at least one end of the radiating component 40 along a first direction. The power supply component 50 realizes electromagnetic wave mode conversion and impedance matching.

[0055] The two SIW cavities 413 with short-circuited terminals and the two alternating slot arrays 415 are symmetrically arranged on both sides of the central slot 414 with the center line of the central slot 414 along the first direction as the axis of symmetry.

[0056] Some embodiments of this invention achieve high-gain side-firing radiation and continuous wide-angle beam scanning by loading a certain length of longitudinal slot substrate integrated waveguide cavity on both sides of the double T-junction of the periodic slot element and using the input impedance of the cavity to control the radiation capability of the periodic slot. To overcome the shortcomings of existing SIW-LWA (Substrate Integrated Waveguide-Leaky-Wave Antenna) bandgap suppression methods that require additional complex slot or via designs, some embodiments of this invention employ a simpler and more convenient SIW cavity design with a short-circuited terminal in the double T-junction. Furthermore, some embodiments of this invention enable a simpler and more compact two-dimensional substrate integrated waveguide slot antenna array, avoiding the problems of complex and large-area power divider network designs in existing antenna arrays. This facilitates antenna miniaturization and integration, and has significant economic and application value.

[0057] Figure 3 This is a schematic diagram of the structure of a radiating element of an antenna array according to some embodiments of the present invention. (Reference) Figure 3 Each of the alternating slot arrays 415 includes a plurality of longitudinal slots arranged along a second direction. These longitudinal slots are alternately offset relative to the central slot 414 along a first direction, where the second direction is perpendicular to the first direction. The electromagnetic wave propagation path within the longitudinal slots is parallel to the length direction of the slot. The central slot 414 is a transverse slot, and the electromagnetic wave propagation path within it is perpendicular to the length direction of the slot. The first direction is perpendicular to the length direction of the central slot 414, and the second direction is parallel to the length direction of the longitudinal slots. In some embodiments, each of the alternating slot arrays 415 includes three longitudinal slots 4151, 4152, and 4153 arranged along the second direction. The three longitudinal slots 4151, 4152, and 4153 are arranged sequentially in a direction away from the central slot 414.

[0058] In some embodiments, the central gap 414 and the longitudinal gaps 4151, 4152, 4153 are sized l along the second direction. s All are 15mm, with the dimension w along the first direction. s All are 3mm. The center offset d of the longitudinal gap relative to the central gap along the first direction is alternately staggered. s The center offset is 1 mm. The center offset is the distance of the center of each longitudinal slot relative to the centerline K of the central slot in the first direction. In some embodiments, the widths w1, w2, and w3 of the SIW unit structure loaded with each longitudinal slot along the second direction are all 22.8 mm, and the width w of the T-junction corresponding to each central slot is 22.8 mm.

[0059] Figure 4This is a schematic diagram of the overall structure of a substrate-integrated waveguide slot antenna array with a power divider network according to some embodiments of the present invention. (Reference) Figure 4 In some embodiments, the feed assembly 50 is located at both ends of the radiating assembly 40 along a first direction, including an input port 51 and an output port 52, wherein the input port and / or output port includes a substrate-integrated waveguide 501. In some embodiments, the input port and / or output port further includes a microstrip transmission line. The microstrip transmission line is a 50Ω feed line.

[0060] refer to Figure 1 In some embodiments, the input port and / or output port further includes a microstrip transmission line 502 and a microstrip transition line 503. In some embodiments, the input port and / or output port includes a substrate integrated waveguide 501, a microstrip transmission line 502, and a microstrip transition line 503. In some embodiments, the microstrip transmission line 502 is a 50Ω feed line, and the length L1 and width w of the microstrip transition line 503 are... f The lengths are 9mm and 16mm respectively, and the length L2 of the substrate integrated waveguide 501 is 8.1mm. In the embodiments of this application, the impedance matching of the microstrip line and the radiating component is achieved through the structure of the feeding component 50. In some embodiments, the microstrip feed structure including the substrate integrated waveguide 501, the microstrip transmission line 502, and the microstrip transition line 503 can be composed of a closed substrate integrated waveguide and a coaxial bottom feed structure ( Figure 4 (The illustrated embodiment is not shown.) Instead, for example, the feeding component includes a substrate integrated waveguide 501 and a coaxial probe, with the coaxial probe extending directly into the SIW substrate 10. The coaxial probe can serve as impedance matching and electromagnetic field mode conversion. In the embodiments of this application, the substrate integrated waveguide 501 has a certain length to ensure a single electromagnetic wave mode; specifically, it completely converts from the microstrip TEM mode to the waveguide TE mode. 10 There are no other higher-order modules.

[0061] In the embodiments of this application, the antenna array is a leaky wave radiator, covering a frequency range of 5.2 GHz to 6.2 GHz, with a beam scanning angle of -46° to 0°, and a maximum gain of 19.2 dBi in the side-firing direction.

[0062] Figure 5 This is a schematic diagram of the overall structure of a substrate-integrated waveguide slot antenna array with a power divider network according to some embodiments of the present invention. Figure 6 This is a schematic diagram of the feeding components and center slot of the antenna array in some embodiments of the present invention. Figure 7 The image shows a physical diagram of a substrate-integrated waveguide slotted antenna array with a power divider network according to some embodiments of the present invention. (Reference) Figures 5-7In some embodiments, the feeding component 50 includes an input port 51 located at one end of the radiating component along a first direction. In some embodiments, the input port 51 is a substrate-integrated waveguide 501. In some embodiments, the input port 51 includes the substrate-integrated waveguide 501 and a microstrip transmission line, wherein the microstrip transmission line is a 50Ω feed line. In some embodiments, the input port 51 includes a microstrip transmission line 502, a microstrip transition line 503, and the substrate-integrated waveguide 501. In some embodiments, the microstrip transmission line is a 50Ω feed line, and the length L1 and width w of the microstrip transition line are... f The lengths are 9mm and 16mm respectively, and the length L2 of the substrate integrated waveguide 501 is 8.1mm.

[0063] In some embodiments, the other end of the radiating component opposite to the input port 51 is a short surface 53.

[0064] In some embodiments, the short surface 53 is implemented via a metallized via. The distance d from the short surface 53 to the nearest central gap 414 is... t It is 11mm. Specifically, the distance d t The distance between the short road surface 53 and the center of the nearest central gap 414.

[0065] In some embodiments, the feeding component 50 is located at both ends of the radiating component 40 along a first direction, including an input port 51 and an output port 52, wherein the input port and / or output port includes a substrate integrated waveguide 501. In some embodiments, the input port and / or output port further includes a microstrip transmission line. In some embodiments, the input port and / or output port includes a microstrip transmission line 502 and a microstrip transition line 503. In some embodiments, the input port and / or output port includes a substrate integrated waveguide 501, a microstrip transmission line 502, and a microstrip transition line 503.

[0066] In some embodiments, a short path 53 (not shown) is directly added to the output port 52, or the output port 52 is replaced with the short path 53 (e.g., Figure 5 (As shown).

[0067] In some embodiments of this application, by setting a short surface 53, maximum radiation in the side-firing direction is achieved at a frequency of 5.8 GHz, with a maximum gain of not less than 19.6 dBi and an aperture efficiency of 80%.

[0068] Figure 8 This is a schematic diagram illustrating the working principle of a substrate-integrated waveguide slot antenna array with a power divider network according to some embodiments of the present invention. Figure 1 The illustrated embodiment operates on the same principle. (See reference.) Figure 8The antenna array uses leaky wave radiation, covering a frequency range of 5.2 GHz to 6.2 GHz, with a beam scanning angle of -46° to 0°. When fed by the input port, electromagnetic wave mode conversion and impedance matching are achieved by microstrip lines and substrate integrated waveguides. A traveling wave then propagates along the substrate integrated waveguide while radiation occurs through the slot. The propagation and radiation paths mainly consist of two paths, one along the first direction (…). Figure 8 The series propagation of periodic radiating units in the left-right direction, with a central slit as the radiating structure, and the radiation path direction perpendicular to the length direction of the central slit; one is along the second direction ( Figure 8 The antenna array propagates through two substrate-integrated waveguide cavities (vertical and horizontal) and has an alternating slot array as its radiation structure. The radiation path is parallel to the length of the longitudinal slots. Through propagation and radiation in both directions, the antenna array can achieve two-dimensional beam radiation and scanning. At the same time, the feed energy is greatly attenuated and finally transmitted to the output port for reception via the substrate-integrated waveguides and microstrip lines.

[0069] Figure 9 In some embodiments of the present invention (e.g.) Figure 1 and Figure 4 The aperture electric field distribution of the radiating element in the illustrated embodiment is shown. It can be observed that near 5.8 GHz, the electric field distribution is similar to that of the longitudinal slots 1-3. Figure 9 The longitudinal gaps 1, 2, and 3 correspond to respectively Figure 3 In the embodiment, the electric field amplitudes of the longitudinal slots 4151, 4152, and 4153 are basically consistent, and the phase difference between their electric fields and those of the longitudinal slots 1-3 is less than 10° in the range of 5.8–6 GHz. This indicates that the radiating element has a very uniform aperture field distribution, which can be used to form an antenna array with higher gain and higher aperture efficiency.

[0070] Figure 10 Some embodiments of the present invention (e.g.) Figure 1 and Figure 4 The antenna array of the illustrated embodiment shows E-plane radiation patterns at different frequencies. The patterns demonstrate stable beam scanning capability, with the antenna achieving forward scanning from -46° to 0° in the 5.2–5.8 GHz frequency range and secondary forward scanning from -25° to 0° in the 6–6.2 GHz frequency range.

[0071] Figure 11 Some embodiments of the present invention (e.g.) Figure 1 and Figure 4 The H-plane radiation pattern of the antenna array in the illustrated embodiment at different frequencies is shown. It can be observed that the antenna radiation points to 0° across the entire frequency band, but its beam gradually narrows, reaching a minimum beamwidth of 18.6° at 5.8 GHz.

[0072] Figure 12 Some embodiments of the present invention (e.g.) Figure 1 and Figure 4 The radiation parameters of the antenna array in the illustrated embodiment include directivity, beam scanning angle, and H-plane beamwidth. It can be observed that the antenna achieves side-firing radiation at a frequency of 5.8 GHz and possesses a maximum gain of 19.2 dB.

[0073] Table 1 below shows some embodiments of the present invention (e.g.) Figure 5 and Figure 7 The antenna array of the illustrated embodiment is compared with other antennas.

[0074] Table 1

[0075]

[0076] Figure 13 Some embodiments of the present invention ( Figure 5 and Figure 7 The antenna array simulation and measurement of the reflected parameters (shown in the embodiment) show that, due to the influence of the short-circuit surface at the terminal and the relatively small number of periodic elements, the antenna reflection coefficient exhibits a significant standing wave distribution in the 5–6 GHz frequency range, with a reflection coefficient less than -10 dB in the 5.76–5.82 GHz range and less than -15 dB in the 5.8 GHz range.

[0077] Figure 14 Some embodiments of the present invention ( Figure 5 and Figure 7 The antenna array shown in the embodiment has an E-plane radiation pattern at a frequency of 5.8 GHz. The antenna exhibits high-gain side-firing radiation, and the measured pattern matches the simulated pattern perfectly. The measured 3-dB beamwidth is 16 dB, and the cross-polarization component within the main lobe is much lower than the main polarization component.

[0078] Figure 15 Some embodiments of the present invention ( Figure 5 and Figure 7 The H-plane radiation pattern of the antenna array (shown in the embodiment) at a frequency of 5.8 GHz is shown. The antenna exhibits high-gain side-firing radiation, and the measured pattern matches the simulated pattern perfectly. The measured 3-dB beamwidth is 18 dB, and the cross-polarization component within the main lobe is much lower than the main polarization component.

[0079] This invention provides a two-dimensional substrate integrated waveguide antenna array with high-gain side-fire radiation and continuous beam scanning in a power divider network. It features a compact structure, small size, and simple design, making it suitable for communication scenarios requiring miniaturization. In some embodiments of this invention, the antenna array achieves stable and high-gain forward beam scanning and side-fire radiation within the 5.2–6.2 GHz frequency range, with a scanning angle of -46° to 0°. The maximum gain in the side-fire direction is 19.2 dBi, demonstrating excellent beam radiation and scanning characteristics. Furthermore, by incorporating a short-circuit path, maximum radiation in the side-fire direction is achieved at 5.8 GHz, with a maximum gain of not less than 19.6 dBi and an aperture efficiency of 80%.

[0080] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A two-dimensional substrate integrated waveguide slot antenna array with power divider network removal, characterized in that, The antenna array includes: substrate; Metal layers are located on both sides of the substrate; Metallized vias penetrate the substrate to achieve electrical connection between the metal layers on both sides of the substrate; A radiation assembly, the radiation assembly comprising a plurality of radiation elements arranged along a first direction; Each of the radiating units includes a substrate integrated waveguide double T-junction, two SIW cavities with short-circuited terminals, a central slot, and two alternating slot arrays; The double T-junction finger waveguide has a vertical port on each side, and each port is connected to a SIW cavity with a short-circuited termination. The two SIW cavities with short-circuited terminations and the two alternating slot arrays are symmetrically arranged on both sides of the central slot with the center line of the central slot along the first direction as the axis of symmetry. The two short-circuited SIW cavities correspond to the substrate integrated waveguide double T-junction, and two alternating slot arrays are respectively arranged in the two short-circuited SIW cavities. Each of the alternating slot arrays includes a plurality of longitudinal slots arranged along a second direction, the plurality of longitudinal slots being alternately offset relative to the central slot along a first direction, the second direction being perpendicular to the first direction; A power supply component is located at at least one end of the radiating component along a first direction.

2. The two-dimensional substrate integrated waveguide slot antenna array with power divider network according to claim 1, characterized in that, Each of the alternating slot arrays includes three longitudinal slots arranged along a second direction, and the radiating assembly includes six radiating elements arranged along a first direction.

3. The two-dimensional substrate integrated waveguide slot antenna array with power divider network according to claim 2, characterized in that, The feeding component is located at both ends of the radiating component along the first direction, and includes an input port and an output port, wherein the input port and / or the output port includes a substrate integrated waveguide.

4. The two-dimensional substrate integrated waveguide slot antenna array with power divider network according to claim 3, characterized in that, The input port and / or output port also includes a microstrip transmission line; Alternatively, the input ports and / or output ports may also include microstrip transmission lines and microstrip transition lines.

5. The two-dimensional substrate integrated waveguide slot antenna array with power divider network according to claim 2, characterized in that, The feeding component includes an input port located at one end of the radiating component along a first direction. The input port includes a microstrip transmission line, a microstrip transition line, and a substrate integrated waveguide. The other end of the radiation component opposite to the input port is a short road surface.

6. The two-dimensional substrate integrated waveguide slot antenna array with power divider network according to claim 5, characterized in that, The short road surface is achieved through metallized vias.

7. The two-dimensional substrate integrated waveguide slot antenna array with power divider network according to any one of claims 1-6, characterized in that, The substrate has a dielectric constant of 2.33 and a thickness of 1.35 mm. The thickness of the metal layer on each side of the substrate is 35 μm; The diameter of the metallized vias is 1.1 mm and the spacing is 1.9 mm.

8. The two-dimensional substrate integrated waveguide slot antenna array with power divider network according to claim 7, characterized in that, The array period length of the radiating element along the first direction is 25.8 mm; The dimensions of the central gap and the longitudinal gap along the second direction are both 15 mm, and the dimensions along the first direction are both 3 mm. The center offset of the longitudinal gap relative to the central gap along the first direction is 1 mm; The width of the SIW unit structure with each longitudinal slot is 22.8 mm along the second direction, and the width of the T-junction corresponding to each central slot is 22.8 mm.

9. The two-dimensional substrate integrated waveguide slot antenna array with power divider network according to claim 4 or 5, characterized in that, The microstrip transmission line is a 50Ω feed line, the length and width of the microstrip transition line are 9mm and 16mm respectively, and the length of the substrate integrated waveguide is 8.1mm.

10. The two-dimensional substrate integrated waveguide slot antenna array with power divider network according to claim 1, characterized in that, The antenna array is a leaky wave radiator, covering a frequency range of 5.2 GHz to 6.2 GHz, with a beam scanning angle of -46° to 0°. Alternatively, the antenna array can achieve maximum radiation in the side-firing direction at a frequency of 5.8 GHz by setting a short-circuit path, with a maximum gain of not less than 19.6 dBi and an aperture efficiency of greater than 80%.

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