Substrate integrated waveguide slot antenna array without power division network

Abstract

The invention discloses a substrate integrated waveguide slot antenna array without a power division network. The substrate integrated waveguide slot antenna array comprises a substrate; the metal layers are positioned on two surfaces of the substrate; the metalized via holes penetrate through the substrate to realize electric connection of the metal layers on the two surfaces of the substrate; the radiation assembly comprises a plurality of radiation units arranged along a first direction; each radiation unit comprises a substrate integrated waveguide double-T junction, two SIW cavities with short-circuited terminals, a central slot and two alternating slot arrays; the two SIW cavities are short-circuited at terminals; the two alternating slot arrays are symmetrically arranged on two sides of the central slot by taking the center line of the central slot as a symmetric axis; each alternating slot array comprises a plurality of longitudinal slots arranged along a second direction, the plurality of longitudinal slots are alternately staggered along the first direction relative to the central slot, and the second direction is perpendicular to the first direction; the feed assembly is located at at least one end of the radiation assembly along the first direction. The antenna array provided by the invention is compact in structure, and the miniaturization of the antenna and the two-dimensional SIW array power division network design are realized.

Description

Technical Field

[0001] The invention relates to the field of radio frequency components, and in particular to a substrate integrated waveguide slot antenna array without a power division network. Background Art

[0002] With the development of the fifth and sixth generation mobile communication technologies, antennas, as key radiation devices in microwave and millimeter wave communication systems, face many new demands and challenges in their design, such as miniaturization and low loss. Since substrate-integrated waveguide slot antennas have the advantages of both planar waveguide structures and rectangular waveguide structures, they can achieve low loss while being compact and easy to process, so they are often used in high gain and beam scanning applications.

[0003] However, the beam of a traditional substrate-integrated waveguide slot antenna can only scan forward or backward with frequency, which will cause a bandgap problem with gain deterioration and sharp increase in reflection in the side-firing direction, greatly limiting the application of the beam. Although bandgap suppression can be achieved by loading short-circuit vias or complementary slots near the unit radiation slot, such methods often require the introduction of additional vias and slot designs, making the overall design more difficult. At the same time, in order to achieve a higher-gain two-dimensional beam, substrate-integrated waveguide slot antenna arrays are mostly based on large and complex power division networks, such as multi-channel Y-type power dividers, parabolic reflectors, etc., which will lead to a large feeding area and is not conducive to the miniaturization of the antenna. A small number of substrate-integrated waveguide slot arrays based on multi-layer aperture coupling can solve this problem, but it is still necessary to introduce complex aperture and feeding designs, which increases the difficulty and loss of the overall design of the antenna array. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a substrate integrated waveguide slot antenna array with a power-sharing network. The antenna array has a compact structure, realizes the miniaturization of the antenna and the design of a two-dimensional SIW (Substrate Integrated Waveguide) array power-sharing network.

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

[0006] In some embodiments, a substrate integrated waveguide slot antenna array without a power splitting network is provided, the antenna array comprising:

[0007] substrate;

[0008] Metal layers, 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 component, wherein the radiation component comprises a plurality of radiation units arranged along a first direction;

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

[0012] 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 along the first direction as the symmetry axis;

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

[0014] The feeding component is located at at least one end of the radiation component along the first direction.

[0015] In some embodiments, each of the alternating slot arrays includes three longitudinal slots arranged along the second direction, and the radiation component includes six radiation units arranged along the first direction.

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

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

[0018] Alternatively, the input port and / or the output port further comprises a microstrip transmission line and a microstrip transition line.

[0019] In some embodiments, the feeding component includes an input port located at one end of the radiating component along the 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-circuit surface.

[0021] In some embodiments, the short-circuit is implemented by 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 radiation unit along the first direction is 25.8 mm;

[0026] The size of the central gap and the longitudinal gap along the second direction is 15 mm, and the size along the first direction is 3 mm;

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

[0028] The width of the SIW unit structure loading each longitudinal gap along the second direction is 22.8 mm, and the width of the T-junction corresponding to each central gap 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 9 mm and 16 mm respectively, and the length of the substrate integrated waveguide is 8.1 mm.

[0030] In some embodiments, the antenna array is leaky wave radiation, covers 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 surface, the maximum radiation in the side-firing direction is achieved at a frequency of 5.8 GHz, the maximum gain is not less than 19.6 dBi, and the aperture efficiency is greater than 80%.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows: in some embodiments, a high-gain two-dimensional slot antenna array is realized by periodically loading double T-junctions on both sides of a one-dimensional substrate integrated waveguide transverse slot antenna and connecting it to an equal number of longitudinal slot substrate integrated waveguide cavities. Based on the overall regulation of the aperture field distribution of the antenna array by the longitudinal slot substrate integrated waveguide cavity, a 7×6 (six radiation units, 7 slots (6 longitudinal slots + 1 central slot)) substrate integrated waveguide slot antenna array is designed in some embodiments of the present invention, which realizes side-beam 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 the side-beam direction has a maximum gain of 19.2dBi. In some embodiments, by setting a short-circuit road surface, the maximum radiation in the side-beam direction is achieved at a frequency of 5.8GHz, the maximum gain is not less than 19.6dBi, and the aperture efficiency reaches 80%. In some embodiments of the present invention, the antenna array has a compact structure and adopts a simple microstrip line feeding, thereby realizing the miniaturization of the antenna and the design of a two-dimensional SIW array power distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the overall structure of a substrate integrated waveguide slot antenna array without a power splitting network according to some embodiments of the present invention.

[0034] Figure 2 A schematic diagram of the overall structural dimensions of a substrate integrated waveguide slot antenna array for power splitting networks according to some embodiments of the present invention.

[0035] Figure 3 A schematic diagram of the structure of a radiation unit of an antenna array according to some embodiments of the present invention.

[0036] Figure 4 A schematic diagram of the structure of a substrate integrated waveguide slot antenna array for power splitting networks according to some embodiments of the present invention.

[0037] Figure 5 Schematic diagram of the overall structure of a substrate integrated waveguide slot antenna array without a power splitting network according to some embodiments of the present invention.

[0038] Figure 6 Schematic diagram of the structure of the feeding assembly and the central slot of the antenna array according to some embodiments of the present invention.

[0039] Figure 7 A physical picture of a substrate integrated waveguide slot antenna array for a power splitting network according to some embodiments of the present invention.

[0040] Figure 8 Schematic diagram of the working principle of a substrate integrated waveguide slot antenna array for power splitting networks according to some embodiments of the present invention.

[0041] Fig. 9 This is a diagram of the aperture electric field distribution of the antenna radiation unit of some embodiments of the present invention.

[0042] Fig.10 Schematic diagram of the E-plane radiation pattern of the antenna array at different frequencies according to some embodiments of the present invention.

[0043] Fig.11 Schematic diagram of H-plane radiation of antenna arrays at different frequencies according to some embodiments of the present invention.

[0044] Fig.12 These are radiation parameters of the antenna array according to some embodiments of the present invention.

[0045] Fig.13 The antenna array of some embodiments of the present invention simulates and measures the reflection coefficient.

[0046] Fig.14 1 is an E-plane radiation pattern of the antenna array of some embodiments of the present invention at a frequency of 5.8 GHz.

[0047] Fig.15 1 is the H-plane radiation pattern of the antenna array of some embodiments of the present invention at a frequency of 5.8 GHz. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0050] Figure 1 Schematic diagram of the overall structure of a substrate integrated waveguide slot antenna array without a power splitting network according to some embodiments of the present invention. Figure 2 A schematic diagram of the overall structural dimensions of a substrate integrated waveguide slot antenna array for power splitting networks according to some embodiments of the present invention.

[0051] refer to Figure 1 and Figure 2 In some embodiments, a substrate integrated waveguide slot antenna array without a power division network includes: a substrate 10, a metal layer 20, a metalized via 30, a radiation component 40, and a feeding component 50.

[0052] The metal layer 20 is located on both sides of the substrate 10. The metallized vias 30 penetrate the substrate 10 to achieve electrical connection of the metal layers 20 on both sides of the substrate 10. In some embodiments, the dielectric constant of the substrate 10 is 2.33 and the thickness is 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 as a whole uses F4BM sheet (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 radiation component 40 includes a plurality of radiation units 41 arranged along a first direction. Each of the radiation units 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 HT type. T-type means that a port is opened in the vertical direction of one side of the waveguide to connect to the SIW structure, and the branch waveguide is perpendicular to the main waveguide direction. The double T-junction means that a vertical port is opened on both sides of the waveguide, and each port is connected to a short-circuited SIW cavity. The HT type is used to define two opening positions, and the branch plane is parallel to the plane where the magnetic field is located. 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 arranged in the two short-circuited SIW cavities 413. In some embodiments, the radiation component 40 includes 6 radiation units 41 arranged along the first direction. In some embodiments, the radiation component 40 is 6 radiation units 41 arranged along the first direction. In some embodiments, the array period length p of the radiation unit 41 along the first direction is 25.8 mm. Figure 1 In the embodiment shown, the radiation component 40 has six radiation units 41 arranged along the first direction. Each radiation unit 41 has a central gap 414. Figure 1 In the illustrated embodiment, the radiating element 40 has six central slots 414 .

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

[0055] The two short-circuited SIW cavities 413 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 symmetry axis.

[0056] Some embodiments of the present invention load a substrate integrated waveguide cavity with a longitudinal slot of a certain length on both sides of the double T-junction of the periodic slot unit, and use the input impedance of the cavity to regulate the radiation capacity of the periodic slot, thereby achieving high-gain side-radiation and continuous wide-angle scanning of the beam. In order to overcome the shortcomings of the existing SIW-LWA (Substrate Integrated Waveguide-Leaky-Wave Antenna) bandgap suppression method that requires loading additional complex slots or through-hole designs, the double T-junction loaded terminal short-circuit SIW cavity design used in some embodiments of the present invention is simpler and more convenient to process. At the same time, some embodiments of the present invention can realize a simpler and more compact two-dimensional substrate integrated waveguide slot antenna array, avoiding the problems of complex design and large area of ​​the existing antenna array power division network, which is conducive to the miniaturization and integration of the antenna and has important economic and application value.

[0057] Figure 3 FIG. 1 is a schematic diagram of the structure of a radiation unit of an antenna array according to some embodiments of the present invention. Figure 3 , each of the alternating slot arrays 415 includes a plurality of longitudinal slots arranged along the second direction, and the plurality of longitudinal slots are alternately staggered relative to the central slot 414 along the first direction, and the second direction is perpendicular to the first direction. The direction of the electromagnetic wave propagation path in the longitudinal slot is parallel to the length direction of the slot. The central slot 414 is a transverse slot, and the direction of the electromagnetic wave propagation path in the transverse slot 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 slot. 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 in sequence in a direction away from the central slot 414.

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

[0059] Figure 4The overall structure diagram of the substrate integrated waveguide slot antenna array without power splitting network in some embodiments of the present invention. Figure 4 In some embodiments, the feed component 50 is located at both ends of the radiation component 40 along the first direction, and includes an input port 51 and an output port 52, and the input port and / or the output port include a substrate integrated waveguide 501. In some embodiments, the input port and / or the output port also include 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 comprises a microstrip transmission line 502 and a microstrip transition line 503. In some embodiments, the input port and / or output port comprises 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 of the microstrip transition line 503 is equal to the width w f The lengths L2 of the substrate integrated waveguide 501 are 9 mm and 16 mm respectively, and the length L2 of the substrate integrated waveguide 501 is 8.1 mm. In the embodiment of the present application, the impedance matching of the microstrip line and the radiation component is achieved through the structure of the feeding component 50. In some embodiments, the microstrip feed line 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 embodiment shown is not shown in the figure), for example, the feeding assembly includes a substrate integrated waveguide 501 and a coaxial probe, and the coaxial probe is directly inserted into the SIW substrate 10. The coaxial probe can play a role in impedance matching and electromagnetic field mode conversion. In the embodiment of the present application, the substrate integrated waveguide 501 has a certain length to ensure that the electromagnetic wave mode is single, specifically, completely converted from the microstrip TEM mode to the waveguide TE 10 module, there are no other higher-order modules.

[0061] In an embodiment of the present application, the antenna array is leaky wave radiation, covers a frequency of 5.2 GHz to 6.2 GHz, has a beam scanning angle of -46° to 0°, and has a maximum gain of 19.2 dBi in the broadside direction.

[0062] Figure 5 Schematic diagram of the overall structure of a substrate integrated waveguide slot antenna array without a power splitting network according to some embodiments of the present invention. Figure 6 Schematic diagram of the structure of the feeding assembly and the central slot of the antenna array according to some embodiments of the present invention. Figure 7 A physical picture of a substrate integrated waveguide slot antenna array for power splitting networks according to some embodiments of the present invention. Figure 5-Figure 7In some embodiments, the feed component 50 includes an input port 51, which is located at one end of the radiation component along the first direction. In some embodiments, the input port 51 is a substrate integrated waveguide 501. In some embodiments, the input port 51 includes a substrate integrated waveguide 501 and a microstrip transmission line, and 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 a substrate integrated waveguide 501. In some embodiments, the microstrip transmission line is a 50Ω feed line, and the length L1 of the microstrip transition line is equal to the width w f They are 9 mm and 16 mm respectively, and the length L2 of the substrate integrated waveguide 501 is 8.1 mm.

[0063] In some embodiments, the other end of the radiation component opposite to the input port 51 is a short-circuit board 53 .

[0064] In some embodiments, the short-circuit 53 is implemented by a metallized via. The distance d between the short-circuit 53 and the nearest center gap 414 is t Specifically, the distance d t is the distance between the short-circuit surface 53 and the center of the nearest center gap 414 .

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

[0066] In some embodiments, a short-circuit 53 (not shown) is directly added to the output port 52, or the output port 52 is replaced by the short-circuit 53 (such as Figure 5 shown).

[0067] In some embodiments of the present application, by providing the short-circuit surface 53, the maximum radiation in the side-ray direction is achieved at a frequency of 5.8 GHz, the maximum gain is not less than 19.6 dBi, and the aperture efficiency reaches 80%.

[0068] Figure 8 Schematic diagram of the working principle of the substrate integrated waveguide slot antenna array without power splitting network in some embodiments of the present invention ( Figure 1 The working principle of the embodiment shown is the same as this). Figure 8The antenna array is leaky wave radiation, covering a frequency of 5.2GHz to 6.2GHz, and a beam scanning angle of -46° to 0°. When the input port is fed, the microstrip line and the substrate integrated waveguide realize electromagnetic wave mode conversion and impedance matching, and then propagate the traveling wave along the substrate integrated waveguide while radiating through the gap. There are two main propagation and radiation paths, one is along the first direction ( Figure 8 The radiation structure is a central slot, and the radiation path direction is perpendicular to the length direction of the central slot; one is along the second direction ( Figure 8 The antenna array is a two-dimensional beam transmission system. The antenna array transmits the light through two substrate integrated waveguide cavities (in the middle and upper directions). The radiation structure is an alternating slot array, and the radiation path direction is parallel to the length direction of the longitudinal slot. Through propagation and radiation in two directions, the antenna array can realize the radiation and scanning of two-dimensional beams. At the same time, the input energy is greatly attenuated, and finally transmitted to the output port for reception by the substrate integrated waveguide and microstrip line.

[0069] Fig. 9 In some embodiments of the present invention (such as Figure 1 and Figure 4 The electric field distribution diagram of the radiating unit in the embodiment shown in FIG. 1 is shown in FIG. 1 . It can be found that near 5.8 GHz, the vertical slots 1-3 ( Fig. 9 The longitudinal gaps 1, 2, and 3 correspond to Figure 3 The electric field amplitudes of the longitudinal slots 4151, 4152, and 4153 in the embodiment are basically the same, and the electric field phase difference with the longitudinal slots 1-3 is less than 10° in the range of 5.8 to 6 GHz. This shows that the radiation unit has a very uniform aperture field distribution and can be arrayed to achieve an antenna array with higher gain and higher aperture efficiency.

[0070] Fig.10 For some embodiments of the present invention (such as Figure 1 and Figure 4 The E-plane radiation pattern of the antenna array of the embodiment shown in the figure at different frequencies. The pattern shows a stable beam scanning capability. In the frequency range of 5.2 to 5.8 GHz, the antenna achieves a forward scanning of -46° to 0°, and in the frequency range of 6 to 6.2 GHz, the antenna achieves a secondary forward scanning of -25° to 0°.

[0071] Fig.11 For some embodiments of the present invention (such as Figure 1 and Figure 4 The H-plane radiation pattern of the antenna array of the embodiment shown in FIG. 1 at different frequencies. It can be found that within the entire frequency band, the antenna radiation is directed to 0°, but its beam gradually narrows, with the narrowest beam width of 18.6° at 5.8 GHz.

[0072] Fig.12 For some embodiments of the present invention (such as Figure 1 and Figure 4 The radiation parameters of the antenna array of the embodiment shown in FIG. 1 include directivity, beam scanning angle and H-plane beam width. It can be found that at a frequency of 5.8 GHz, the antenna can achieve side-radiation and has a maximum gain of 19.2 dB.

[0073] Table 1 below shows some embodiments of the present invention (eg Figure 5 and Figure 7 Comparative data of the antenna array of the embodiment shown in the figure) and other antennas.

[0074] Table 1

[0075]

[0076] Fig.13 For some embodiments of the present invention ( Figure 5 and Figure 7 The antenna array of the embodiment shown in the figure is simulated and the reflection parameters are measured. It can be found that due to the influence of the terminal short-circuit surface and the small number of periodic units, the reflection coefficient of the antenna presents a significant standing wave distribution in the frequency range of 5 to 6 GHz, the reflection coefficient is less than -10 dB in the range of 5.76 to 5.82 GHz, and the reflection coefficient is less than -15 dB at 5.8 GHz.

[0077] Fig.14 For some embodiments of the present invention ( Figure 5 and Figure 7 The E-plane radiation pattern of the antenna array of the embodiment shown in the figure at a frequency of 5.8 GHz. The antenna exhibits high-gain broadside radiation, the measured pattern is completely consistent with the simulated pattern, 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] Fig.15 For some embodiments of the present invention ( Figure 5 and Figure 7 The H-plane radiation pattern of the antenna array of the embodiment shown in the figure at a frequency of 5.8 GHz. The antenna exhibits high-gain side-ray radiation, the measured pattern is completely consistent with the simulated pattern, the measured 3-dB beamwidth is 18 dB, and the cross-polarization component within the main lobe range is much lower than the main polarization component.

[0079] The present invention provides a two-dimensional substrate integrated waveguide antenna array with high-gain side-fire radiation and continuous beam scanning without a power-splitting network. The antenna array has a compact structure, small size, and simple design, and is suitable for communication scenarios with miniaturization requirements. The antenna array in some embodiments of the present invention can achieve stable and high-gain forward beam scanning and side-fire radiation in the frequency range of 5.2 to 6.2 GHz, with a scanning angle of -46° to 0°, with a maximum gain of 19.2 dBi in the side-fire direction, showing excellent beam radiation and scanning characteristics. And by setting a short-circuit road surface, the maximum radiation in the side-fire direction is achieved at a frequency of 5.8 GHz, the maximum gain is not less than 19.6 dBi, and the aperture efficiency reaches 80%.

[0080] It will be easily understood by those skilled in the art that the above description is only 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 in the protection scope of the present invention.

Claims

1. A substrate integrated waveguide slot antenna array without power splitting network, characterized in that: The antenna array comprises: substrate; Metal layers, 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 component, wherein the radiation component comprises a plurality of radiation units arranged along a first direction; Each of the radiation units includes a substrate integrated waveguide double T-junction, two short-circuited terminal 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 along the first direction as the symmetry axis; Each of the alternating slot arrays comprises a plurality of longitudinal slots arranged along a second direction, the plurality of longitudinal slots being alternately staggered relative to the central slot along a first direction, the second direction being perpendicular to the first direction; The feeding component is located at at least one end of the radiation component along the first direction.

2. The substrate integrated waveguide slot antenna array for power splitting network according to claim 1, characterized in that: Each of the alternating slot arrays includes three longitudinal slots arranged along the second direction, and the radiation component includes six radiation units arranged along the first direction.

3. The substrate integrated waveguide slot antenna array for power splitting network according to claim 2, characterized in that: The feeding component is located at two ends of the radiation component along the first direction, and includes an input port and an output port. The input port and / or the output port includes a substrate integrated waveguide.

4. The substrate integrated waveguide slot antenna array for power splitting network according to claim 3, characterized in that: The input port and / or the output port further comprises a microstrip transmission line; Alternatively, the input port and / or the output port further comprises a microstrip transmission line and a microstrip transition line.

5. The substrate integrated waveguide slot antenna array for power splitting network according to claim 2, characterized in that: The feeding component comprises an input port, which is located at one end of the radiation component along the first direction, and the input port comprises 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-circuit surface.

6. The substrate integrated waveguide slot antenna array for power splitting network according to claim 5, characterized in that: The short-circuit path is realized by a metallized via.

7. The substrate integrated waveguide slot antenna array for power splitting network according to any one of claims 1 to 6, characterized in that: The dielectric constant of the substrate is 2.33 and the thickness is 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 substrate integrated waveguide slot antenna array for power splitting network according to claim 7, characterized in that: The array period length of the radiation unit along the first direction is 25.8 mm; The size of the central gap and the longitudinal gap along the second direction is 15 mm, and the size along the first direction is 3 mm; The center offset of the longitudinal gaps alternately staggered relative to the central gap along the first direction is 1 mm; The width of the SIW unit structure loading each longitudinal gap along the second direction is 22.8 mm, and the width of the T-junction corresponding to each central gap is 22.8 mm.

9. The substrate integrated waveguide slot antenna array for power splitting 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 9 mm and 16 mm respectively, and the length of the substrate integrated waveguide is 8.1 mm.

10. The substrate integrated waveguide slot antenna array for power splitting network according to claim 1, characterized in that: The antenna array is leaky wave radiation, covering a frequency of 5.2 GHz to 6.2 GHz, and a beam scanning angle of -46° to 0°; Alternatively, the antenna array achieves maximum radiation in the broadside direction at a frequency of 5.8 GHz by setting a short-circuit surface, with a maximum gain of not less than 19.6 dBi and an aperture efficiency of greater than 80%.

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