Ridge waveguide antenna subarray, waveguide antenna array, radar and electronic equipment

Abstract

The embodiment of the invention relates to the technical field of semiconductors, and discloses a ridge waveguide antenna subarray, a waveguide antenna array, a radar and electronic equipment, and the ridge waveguide antenna subarray comprises a ridge waveguide and a radiation part; the ridge waveguide is hollow, and the radiation part is arranged on the ridgeless wide wall of the ridge waveguide; the radiation part comprises at least two radiation slots; a ridge is arranged on the ridge wide wall in the ridge waveguide; wherein the ridges are located below the at least two radiation slots, and the sizes of the ridges below the at least two radiation slots are not completely the same. The ridge waveguide antenna provided by the scheme has the characteristics of smaller antenna size and wider bandwidth.

Description

Technical Field

[0001] This application relates to the field of semiconductor technology, and in particular to a ridge waveguide antenna subarray, a waveguide antenna array, radar, and electronic equipment. Background Technology

[0002] With the development of autonomous driving technology, 4D millimeter-wave imaging radar will be the future trend of millimeter-wave radar development. The core of 4D millimeter-wave imaging radar is high resolution, which in turn depends on high-resolution range and high-resolution angle. High-resolution range requires high bandwidth, while high-resolution angle requires increasing the antenna aperture. Increasing the antenna aperture typically involves chip cascading and using multiple transmitting and receiving antennas in an array. However, chip cascading leads to longer feedlines and higher losses. Therefore, the radar RF front-end antenna needs to have wide bandwidth characteristics and low loss, suitable for multi-transmitter, multi-receiver antenna layouts. Summary of the Invention

[0003] The purpose of this application is to provide a ridge waveguide antenna subarray, waveguide antenna array, radar, and electronic equipment with a smaller antenna size and a wider bandwidth.

[0004] To address the aforementioned technical problems, one embodiment of this application provides a ridge waveguide antenna subarray, comprising: a ridge waveguide and a radiating section;

[0005] The ridge waveguide is hollow, and the radiating part is provided on the ridgeless wide wall of the ridge waveguide;

[0006] The radiating section includes at least two radiating slots;

[0007] A ridge is provided on the ridged wide wall inside the ridge waveguide;

[0008] The ridge is located below the at least two radial slits, and the ridges below the at least two radial slits are not all the same size.

[0009] Compared with related technologies, the embodiments of this application provide a radiating part including at least two radiating slots on the ridgeless wide wall of the ridge waveguide, and a ridge is provided on the ridged wide wall inside the ridge waveguide. By constructing the antenna by setting the radiating slots on the ridge waveguide, the size of a single ridge waveguide antenna subarray is reduced, thereby reducing the spacing of the antenna array and better meeting the requirements of small-pitch arrays. At the same time, the ridges provided on the ridged wide wall inside the ridge waveguide are located below the at least two radiating slots, and the sizes of the ridges under the at least two radiating slots are not exactly the same, thereby ensuring that the wavelengths and resonant frequencies of the radio frequency signals at the radiating slots are not completely different, thus widening the bandwidth of the transmitted radio frequency signals and ensuring antenna performance.

[0010] In some embodiments, the dimensions of the ridges under the at least two radial slits are not exactly the same, including: the height and / or width of the ridges under the at least two radial slits are not exactly the same.

[0011] In some embodiments, the dimensions of the ridges under the at least two radiating slots are not identical, including: the height and / or width of the ridges under each radiating slot are not identical at different locations along the extension direction of the ridge waveguide.

[0012] In some embodiments, the at least two radiating slots are arranged sequentially along the extension direction of the ridge waveguide, and the at least two radiating slots are staggered on both sides of the central axis of the ridge waveguide's wide-walled structure.

[0013] In some embodiments, the ridges corresponding to the radial slits located on the same side of the central axis have the same size, while the ridges corresponding to the radial slits located on opposite sides of the central axis have different sizes.

[0014] In some embodiments, the ridge includes a first ridge segment and a second ridge segment alternately arranged along the extension direction of the ridge waveguide, the first ridge segment and the second ridge segment having different dimensions.

[0015] In some embodiments, the radiating slot located on one side of the central axis of the ridge waveguide without a ridge wide wall is corresponding to the first ridge segment, and the radiating slot located on the other side of the central axis is corresponding to the second ridge segment.

[0016] In some embodiments, the radial slits located on both sides of the central axis are corresponding to the connection points of the first ridge segment and the second ridge segment, and the first ridge segment and the second ridge segment in the radial slits have different lengths in the radial slits.

[0017] In some embodiments, the length of the spineless wide wall is less than Where λ is the operating wavelength of the signal transmitted by the ridge waveguide antenna subarray.

[0018] Another embodiment of this application provides a waveguide antenna array, including: at least two ridge waveguide antenna subarrays as described in any of the above embodiments, wherein the ridge waveguide antenna subarrays are arranged side by side, and the spacing between two adjacent ridge waveguide antenna subarrays is less than or equal to Where λ is the operating wavelength of the signal transmitted by the ridge waveguide antenna subarray.

[0019] Another aspect of this application provides a radar, including: a ridge waveguide antenna subarray as described in any of the above embodiments, or a waveguide antenna array as described in any of the above embodiments.

[0020] Another embodiment of this application provides an electronic device, including: the radar described above. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0022] Figure 1 This is a schematic diagram of surface current in a traditional air waveguide;

[0023] Figure 2 These are cross-sectional views of traditional air waveguides and ridge waveguides;

[0024] Figure 3 This is a comparison chart of the width dimensions of traditional air waveguides and ridge waveguides;

[0025] Figure 4 This is a top view of a ridge waveguide antenna subarray provided according to an embodiment of this application;

[0026] Figure 5 This is a front view of a ridge waveguide antenna subarray provided according to an embodiment of this application;

[0027] Figure 6 This is a side view of a ridge waveguide antenna subarray provided according to an embodiment of this application;

[0028] Figure 7 This is a comparison diagram of the return loss of a traditional air waveguide antenna and a ridge waveguide antenna subarray.

[0029] Figure 8 This is a top view of a waveguide antenna array provided according to an embodiment of this application. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are presented in the various embodiments of this application to enable readers to better understand this application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in this application can be implemented. The division of the following embodiments is for the convenience of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0031] The transmission medium of the waveguide antenna is air, and the transmission loss is relatively low. However, when the size of the waveguide antenna is too large, due to the requirement of a 0.5λ (λ is the working wavelength of the signal transmitted in the antenna) spacing in the antenna layout, the antennas will overlap with each other, and the antenna performance cannot be achieved. At the same time, the traditional waveguide antenna also has the problem of narrow bandwidth.

[0032] The traditional waveguide slot antenna can achieve high-gain antenna performance. However, due to the large size of the antenna, it is impossible to arrange the antennas with a 0.5λ spacing. As Figure 1 shown, it is a schematic diagram of the surface current of a traditional rectangular waveguide. The length of the wide side of the rectangular waveguide is a, and the length of the narrow side is b. Generally, to achieve single-mode transmission in the rectangular waveguide, the length of the wide side a needs to satisfy: 0.5λ < a < λ, which cannot meet the requirement of arranging the antennas with a 0.5λ spacing.

[0033] To meet the requirement of arranging the antennas with a small spacing, taking the millimeter-wave radar system as an example, the ridge waveguide antenna is introduced in the embodiment of the present application. As <​​​​​​​​​​​​​​​​​​​​The front and side views of the ridge waveguide antenna subarray are shown. S1 and S2 are both wide walls. Since the ridge 3 of the ridge waveguide 1 is only set on the wide wall S2, S1 is also called the ridgeless wide wall and S2 is also called the ridged wide wall.

[0038] like Figure 5 As shown, a radiating section 2 is provided on the ridgeless wide wall S1 of the ridge waveguide 1; the radiating section 2 includes at least two radiating slots (such as radiating slot 21 and radiating slot 22); a ridge 3 is provided on the ridged wide wall S2 inside the ridge waveguide 1.

[0039] The radiating portion 2 disposed on the ridgeless wide wall S1 may include at least two radiating slots, such as, but not limited to, radiating slot 21 and radiating slot 22. The radiating slots may be flush with the outer surface of the ridgeless wide wall S1; alternatively, for ease of manufacturing, the radiating slots may protrude from the outer surface of the ridgeless wide wall S1. A ridge 3 is disposed on the ridged wide wall S2 within the ridged waveguide 1, such as... Figure 6 As shown, ridge 3 can be a continuous ridge segment or a segmented ridge segment arranged along the extension direction of ridge waveguide 1. The dimensions of ridge 3 at different positions along the extension direction can be the same or different; this embodiment does not limit this. In the 77GHz band, as... Figure 3 As shown, the waveguide width in this embodiment can be reduced to only 1.5mm, which can be well applied to small-pitch arrays.

[0040] It should be emphasized that, regardless of the structure and position of the ridge 3 in this embodiment, the following requirements must be met: the ridge 3 is located below at least two radial slits, and the dimensions of the ridge 3 under the at least two radial slits are not exactly the same.

[0041] by Figure 4 Taking radiation slots 21 and 22 as examples, ridge 3 must include the portion of ridge 3 located below radiation slots 21 and 22, and the size of ridge 3 located below radiation slot 21 is different from the size of ridge 3 located below radiation slot 22. Because the sizes of ridge 3 at these two locations are different, the equivalent waveguide wavelength of radio frequency signals in the same frequency band passing through these two locations is different (e.g., the waveguide wavelengths corresponding to these two locations being equivalent to rectangular waveguides are different). Since the waveguide wavelengths are different, the resonant frequencies of the radiation slots will be different, thereby achieving the effect of widening the overall bandwidth of the radiated signal.

[0042] Compared to the narrow bandwidth of traditional waveguide antennas, the ridge waveguide antenna subarray provided in this embodiment optimizes the bandwidth on the ridge waveguide. A single ridge waveguide antenna subarray is as follows: Figures 4-6As shown, the radiating slots 21 and 22 have the same size. Adjusting the size of the ridge 3 below the slot is equivalent to adjusting the corresponding width of the ridge waveguide, so that the two radiating slots correspond to different resonant frequencies. By introducing a new resonant frequency, the antenna bandwidth is widened.

[0043] The following embodiments will further illustrate the structural optimization of the ridge 3 and the radiating part 2.

[0044] In some embodiments, the dimensions of the ridges 3 under the at least two radial slits are not exactly the same, which may include: the height and / or width of the ridges 3 under the at least two radial slits are not exactly the same.

[0045] Changing the size of ridge 3 by altering its height and / or width is relatively simple and easy to implement. Adjusting the width and / or height of ridge 3 below the radiating slot is equivalent to adjusting the corresponding width of ridge waveguide 1, thereby allowing the two slots to correspond to different resonant frequencies, introducing new resonant frequencies, and widening the antenna bandwidth.

[0046] In some embodiments, the dimensions of the ridges 3 under the at least two radiating slots are not exactly the same, and may include: the height and / or width of the ridges 3 under each radiating slot are not exactly the same at different locations along the extension direction of the ridge waveguide 1.

[0047] In this embodiment, even if the dimensions of the ridges 3 under at least two radiation slots are not exactly the same, the height and / or width of the ridges 3 under the same radiation slot can be different at different positions under the radiation slot. For example, along the extension direction of the ridge waveguide 1 under the same radiation slot, the height and / or width of the ridges 3 at different positions are not exactly the same.

[0048] by Figure 4 Taking radiation slots 21 and 22 as examples, along the extension direction of the ridge waveguide 1, the upper part of the ridge 3 has a larger width, while the lower part has a smaller width; Figure 6 Taking the radiation slots 21 and 22 as examples, along the extension direction of the ridge waveguide 1 below the radiation slot, the height of the ridge 3 on the left is larger and the height of the ridge 3 on the right is smaller.

[0049] In some embodiments, the at least two radiating slots are arranged sequentially along the extension direction of the ridge waveguide 1, and the at least two radiating slots are staggered on both sides of the central axis of the ridgeless wide wall S1 of the ridge waveguide 1.

[0050] like Figure 4As shown, radiating slots 21 and 22 are arranged sequentially along the extension direction of the ridge waveguide 1, with radiating slot 21 slightly to the left of the central axis of the ridge waveguide 1's unridged wide wall S1, and radiating slot 22 slightly to the right of the central axis of the ridge waveguide 1's unridged wide wall S1. The right edge of radiating slot 21 can coincide with or be located to the right of the central axis, but radiating slot 21 remains positioned slightly to the left relative to the central axis. Similarly, the left edge of radiating slot 22 can coincide with or be located to the left of the central axis, but radiating slot 22 remains positioned slightly to the right relative to the central axis. The specific offset can be adjusted according to the desired radiation pattern. By staggering multiple radiating slots along both sides of the central axis of the unridged wide wall S1, the distance between adjacent radiating slots can be increased without increasing the length of the ridge waveguide 1, effectively isolating the radiating slots. The slots can be moved according to the desired radiation pattern.

[0051] In some embodiments, the ridges 3 corresponding to radial slits on the same side of the central axis have the same size, while the ridges 3 corresponding to radial slits on opposite sides of the central axis have different sizes.

[0052] For example Figure 4 In the diagram, on both sides of the central axis of the ridgeless wide wall S1 of the ridge waveguide 1, in addition to the radiation slots 21 and 22 shown in the figure, more other radiation slots can be provided. The radiation slots on the same side as the radiation slot 21 have the same size as the radiation slot 21, and the ridges 3 corresponding to all radiation slots on that side have the same size. The radiation slots on the same side as the radiation slot 22 have the same size as the radiation slot 22, and the ridges 3 corresponding to all radiation slots on that side have the same size. At the same time, the size of the radiation slots on both sides can be the same, but the size of the ridges 3 corresponding to the radiation slots on both sides is not the same. For example, the height and / or width of the ridges 3 corresponding to the radiation slots on both sides are not the same, or there are ridge 3 parts with the same height and / or width, but the position and length ratio of the same ridge 3 parts are different.

[0053] In some embodiments, the ridge 3 includes a first ridge segment 31 and a second ridge segment 32 that are alternately arranged along the extension direction of the ridge waveguide 1, and the first ridge segment 31 and the second ridge segment 32 have different dimensions.

[0054] like Figure 4 , Figure 6As shown, multiple first ridge segments 31 and second ridge segments 32 can be staggered along the extension direction of the ridge waveguide 1, and the height and / or width of the first ridge segments 31 and the second ridge segments 32 are different. For example, the height and width of the first ridge segment 31 can be greater than the height and width of the second ridge segment 32, as shown in the figure, but not limited to the case shown. In other embodiments, the height of the first ridge segment 31 can be greater than the height of the second ridge segment 32, but the width of the first ridge segment 31 can be less than or equal to the width of the second ridge segment 32; or the width of the first ridge segment 31 can be greater than the width of the second ridge segment 32, but the height of the first ridge segment 31 can be less than or equal to the height of the second ridge segment 32. Furthermore, the size of the ridge 3 provided on the ridged wide wall S2 corresponding to the ridged wide wall S2 without radiation slots is not limited, for example, it can be as follows: Figure 4 , Figure 6 The ridge 3 section shown is of the same size. This ridge structure can be the same size as the directly connected first ridge segment 31 or second ridge segment 32 to facilitate processing.

[0055] This method of staggering ridge segments of different sizes to form ridge 3 makes it easier to lay out the radial gaps, so that the ridge 3 under at least two radial gaps has different sizes.

[0056] In some embodiments, such as Figure 4 , Figure 6 As shown, the radiating slot on one side of the central axis of the ridgeless wide wall S1 of the ridge waveguide 1 corresponds to the first ridge segment 31, and the radiating slot on the other side of the central axis corresponds to the second ridge segment 32.

[0057] Specifically, when setting the relative positions of the radial slits and the ridges 3, since the first ridge segment 31 and the second ridge segment 32 have different dimensions, each radial slit can be associated with a ridge segment. For example, setting the radial slits on one side of the central axis of the aforementioned ridgeless wide wall S1 to correspond to the first ridge segment 31, and setting the radial slits on the other side of the central axis to correspond to the second ridge segment 32, is a relatively simple way to achieve different dimensions of the ridges 3 under at least two radial slits.

[0058] In other embodiments, such as Figure 4 , Figure 6 As shown, the radial gaps on both sides of the central axis are correspondingly set at the connection points of the first ridge segment 31 and the second ridge segment 32, and the first ridge segment 31 and the second ridge segment 32 in the radial gap have different lengths in the radial gap.

[0059] Specifically, when setting the relative positions of the radial slots and ridges 3, since the dimensions of the first ridge segment 31 and the second ridge segment 32 are different, each radial slot can be set to correspond to the connection point of the two ridge segments. The length ratio of the two ridge segments in the radial slots can be adjusted. For example, the radial slots 21 and 22 on both sides of the central axis of the aforementioned ridgeless wide wall S1 can be set to correspond to the connection points of the first ridge segment 31 and the second ridge segment 32. At the connection point corresponding to the radial slot 21, the lengths of the first ridge segment 31 and the second ridge segment 32 in the radial slot 21 are different, with a length ratio of K1; at the connection point corresponding to the radial slot 22, the lengths of the first ridge segment 31 and the second ridge segment 32 in the radial slot 22 are also different, with a length ratio of K2; and K1 and K2 are different.

[0060] By setting the ratio between the length of the first ridge segment 31 and the length of the second ridge segment 32 below each radial slit, a flexible layout of the radial slits can be achieved, ensuring that at least two radial slits have ridges 3 of different sizes below them.

[0061] In some embodiments, the length of the aforementioned spineless wide-walled S1 is less than Where λ is the operating wavelength of the signal transmitted by the ridge waveguide antenna subarray.

[0062] like Figure 3 As shown. In this embodiment, the 1.5mm width of the ridge waveguide 1 is only an example. In actual applications, the size of the ridge waveguide 1 can be changed by adjusting the size of the ridge 3.

[0063] like Figure 7 The figure shown is a comparison of the return loss of a traditional air waveguide antenna and a ridge waveguide antenna in this embodiment. The ridge waveguide antenna in this embodiment has two resonant frequencies, which greatly improves the bandwidth compared to the single-resonance characteristic of a traditional waveguide antenna.

[0064] In summary, this embodiment introduces a ridge waveguide antenna and optimizes its bandwidth. Compared to traditional waveguide antennas, it has a smaller structural size and wider bandwidth, making it better suited for applications requiring small-pitch arrays.

[0065] Another embodiment of this application provides a waveguide antenna array, including: at least two ridge waveguide antenna subarrays as described in any of the above embodiments, the ridge waveguide antenna subarrays being arranged side by side, wherein the spacing between two adjacent ridge waveguide antenna subarrays is less than or equal to Where λ is the operating wavelength of the signal transmitted by the ridge waveguide antenna subarray.

[0066] For example Figure 8As shown, the waveguide antenna array in this embodiment may include, but is not limited to, three ridge waveguide antenna subarrays as described in any of the above embodiments. These ridge waveguide antenna subarrays have the same structure and are arranged side by side (along the extension direction of the ridge waveguide). The spacing between any two adjacent ridge waveguide antenna subarrays is less than or equal to... It meets the requirement of small-pitch arrays in millimeter-wave radar systems in the 77GHz band.

[0067] Another embodiment of this application provides a radar, including: a ridge waveguide antenna subarray as described in any of the above embodiments, or a waveguide antenna array as described in any of the above embodiments.

[0068] The radar is used to transmit electromagnetic wave signals via a transmitting antenna based on a reference frequency, and to receive echoes reflected by target objects using a receiving antenna. It then performs down-conversion processing on the transmitted radio frequency signals to generate and output intermediate frequency (IF) signals. The radar also converts the IF signals into digital signals for further signal processing.

[0069] Optionally, in some embodiments, the frequency-modulated continuous wave signal is a millimeter-wave signal, so that the electronic device equipped with the radar can be applied to fields such as autonomous driving, industrial automation, smart home appliances, and security inspection. The radar can be an AiP millimeter-wave radar chip with an integrated antenna.

[0070] For example, the radar generates a chirp signal according to a preset continuous frequency modulation method; it obtains a radio frequency transmission signal through frequency doubling processing and feeds it to the transmitting antenna to transmit a corresponding detection signal wave. When the detection signal wave is reflected by an object, an echo signal wave is formed. The echo signal wave is converted into a radio frequency received signal through a receiving antenna. The radar uses the radio frequency transmitted signal to perform down-conversion, filtering, and other processing on the radio frequency received signal, and then performs analog-to-digital conversion processing to output a baseband digital signal representing the difference frequency between the detection signal wave and the echo signal wave. Then, through signal processing, measurement information is extracted from the baseband digital signal, and measurement data is output. The signal processing includes digital signal processing calculations based on phase, frequency, and time domain of at least one signal to be processed provided by at least one receiving antenna. The measurement data includes at least one of the following: distance data representing the relative distance to at least one detected obstacle; velocity data representing the relative velocity of at least one detected obstacle; angle data representing the relative angle of at least one detected obstacle, etc.

[0071] In some embodiments, this disclosure also provides an electronic device including the aforementioned radar.

[0072] In some embodiments, the electronic device includes: a device body; and electronic components such as radar as described in the above embodiments disposed on the device body. The device body is a structure that carries and is signal-connected to a radio device. The radio device transmits and / or receives radio signals processed by a phase shifter to achieve functions such as target detection and / or communication within the beam scanning range, thereby providing the device body with target detection information and / or communication information, and thus assisting or even controlling the operation of the device body.

[0073] In some embodiments, the electronic device comprising the device body and at least one of the aforementioned wireless devices can be a component or product applied in fields such as smart homes, transportation, smart homes, consumer electronics, surveillance, industrial automation, in-cabin detection, and healthcare. For example, the device body can be intelligent transportation equipment (such as automobiles, bicycles, motorcycles, ships, subways, trains, etc.), security equipment (such as cameras), liquid level / flow rate detection equipment, smart wearable devices (such as wristbands, glasses, etc.), smart home equipment (such as robot vacuum cleaners, door locks, televisions, air conditioners, smart lights, etc.), various communication devices (such as mobile phones, tablets, etc.), as well as devices such as barriers, intelligent traffic lights, intelligent signs, traffic cameras, and various industrial robotic arms (or robots). It can also be various instruments for detecting vital signs parameters and various devices equipped with such instruments, such as in-cabin detection in automobiles, indoor personnel monitoring, intelligent medical devices, and consumer electronic devices.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] Those skilled in the art will understand that the above embodiments are specific implementations of this application, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of this application.

Claims

1. A ridge waveguide antenna subarray, characterized in that, include: Ridge waveguide and radiating section; The ridge waveguide is hollow, and the radiating part is provided on the ridgeless wide wall of the ridge waveguide; The radiating section includes at least two radiating slots; A ridge is provided on the ridged wide wall inside the ridge waveguide; The ridge is located below the at least two radial slits, and the ridges below the at least two radial slits are not all the same size.

2. The ridge waveguide antenna subarray according to claim 1, characterized in that, The dimensions of the ridges under the at least two radial slits are not exactly the same, including: the height and / or width of the ridges under the at least two radial slits are not exactly the same.

3. The ridge waveguide antenna subarray according to claim 1 or 2, characterized in that, The dimensions of the ridges under the at least two radiation slots are not exactly the same, including: the height and / or width of the ridges under each radiation slot are not exactly the same at different locations along the extension direction of the ridge waveguide.

4. The ridge waveguide antenna subarray according to claim 1 or 2, characterized in that, The at least two radiating slots are arranged sequentially along the extension direction of the ridge waveguide, and the at least two radiating slots are staggered on both sides of the central axis of the ridge waveguide's wide-walled structure.

5. The ridge waveguide antenna subarray according to claim 4, characterized in that, The ridges corresponding to the radial slots located on the same side of the central axis have the same size, while the ridges corresponding to the radial slots located on opposite sides of the central axis have different sizes.

6. The ridge waveguide antenna subarray according to claim 1 or 2, characterized in that, The ridge includes a first ridge segment and a second ridge segment that are alternately arranged along the extension direction of the ridge waveguide, and the first ridge segment and the second ridge segment have different dimensions.

7. The ridge waveguide antenna subarray according to claim 6, characterized in that, The radiating slot located on one side of the central axis of the ridge waveguide without a ridge wide wall is corresponding to the first ridge segment, and the radiating slot located on the other side of the central axis is corresponding to the second ridge segment.

8. The ridge waveguide antenna subarray according to claim 7, characterized in that, The radial gaps located on both sides of the central axis are corresponding to the connection points of the first ridge segment and the second ridge segment, and the lengths of the first ridge segment and the second ridge segment in the radial gap are different.

9. The ridge waveguide antenna subarray according to claim 7, characterized in that, The length of the spineless wide-walled structure is less than λ, where λ is the operating wavelength of the signal transmitted by the ridge waveguide antenna subarray.

10. A waveguide antenna array, characterized in that, include: At least two ridge waveguide antenna subarrays as described in any one of claims 1-9, the ridge waveguide antenna subarrays being arranged side by side, wherein the spacing between two adjacent ridge waveguide antenna subarrays is less than or equal to λ, where λ is the operating wavelength of the signal transmitted by the ridge waveguide antenna subarray.

11. A radar, characterized in that, include: The ridge waveguide antenna subarray as described in any one of claims 1 to 9, or the waveguide antenna array as described in claim 10.

12. An electronic device, characterized in that, include: The radar as described in claim 11.

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