Slow-wave plate structure

Abstract

The present application discloses a slow-wave plate structure, comprising a waveguide radiation body, wherein the front end face of the waveguide radiation body is provided with a serpentine slow-wave groove, and one end of the serpentine slow-wave groove is provided with a feed signal end; a serpentine channel is formed in the serpentine slow-wave groove, the serpentine channel is connected to the feed signal end, the serpentine channel comprises a plurality of straight waveguide sections and connecting waveguide sections, a gap portion is present between two adjacent straight waveguide sections, and the two adjacent straight waveguide sections are connected by means of one connecting waveguide section; and the plurality of straight waveguide sections are provided with waveguide radiation gaps at intervals, or the waveguide radiation gaps are respectively provided in the plurality of straight waveguide sections. The present application has the advantages of simple structure, low cost, good radiation effect, wide application range, etc.

Description

A slow wave plate structure Technical Field

[0001] This utility model relates to the field of antenna technology, and in particular to a slow-wave plate structure. Background Technology

[0002] A slow-wave plate structure is an antenna with slots in the wide or narrow walls of a waveguide, allowing electromagnetic waves transmitted in the waveguide to radiate outwards through the slots. This type of antenna is commonly used in the microwave band and can be applied in fields such as communications, radar, and satellite communications. Currently, some independent waveguide slot antennas are constructed using a slow-wave plate structure. This structure includes a first structural component and a second structural component. The lower surface of the first structural component has multiple long protrusions arrayed along its extension direction, perpendicular to the extension direction of the first structural component. The upper surface of the second structural component has multiple rectangular ridge structures arrayed along its extension direction, with the rectangular ridge structures and long protrusions arranged alternately within the waveguide structure. The upper surface of the first structural component has multiple waveguide radiation slots, each corresponding to a rectangular ridge structure and located directly above the rectangular ridge structure. The cavity between the rectangular ridge structures and long protrusions within the waveguide structure forms a serpentine slow-wave line.

[0003] One end of the serpentine slow wave line is connected to the feed port, and the serpentine slow wave line is connected to the waveguide radiation slot located directly above it. Electromagnetic wave signals flow into the serpentine slow wave line through the feed port, and the electromagnetic wave signals flow along the channel of the serpentine slow wave line, with some signals radiating outward from the waveguide radiation slot directly above.

[0004] However, the aforementioned serpentine slow-wave line structure uses a serpentine slow-wave line on the long front and a long side (i.e., a radiating slot) connected to the long front for input and output, resulting in a large overall volume, high cost, difficulty in manufacturing into a flat antenna, and poor radiation performance. Moreover, since the input and output are not coplanar, the structure is relatively complex, difficult to process and manufacture, and costly. It can usually only be used as an independent antenna and is difficult to expand into an array slot antenna, thus having a narrow range of applications. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a slow-wave plate structure, which has the advantages of simple structure, low cost, good radiation effect and wide applicability.

[0006] To address the aforementioned technical problems, this utility model provides a slow-wave plate structure, comprising a waveguide radiating body, a serpentine slow-wave groove on the front end face of the waveguide radiating body, and a feed signal terminal at one end of the serpentine slow-wave groove; a serpentine channel is formed in the serpentine slow-wave groove, the serpentine channel is connected to the feed signal terminal, the serpentine channel includes a plurality of straight waveguide segments and connecting waveguide segments, a gap is left between two adjacent straight waveguide segments, and two adjacent straight waveguide segments are connected by the connecting waveguide segments; waveguide radiation slots are provided at intervals or separately in the plurality of straight waveguide segments.

[0007] As an improvement to the above scheme, the centerline of the straight waveguide segment is staggered from the centerline of its corresponding waveguide radiation slot.

[0008] As an improvement to the above scheme, the centerlines of the multiple waveguide radiation slots have different offsets.

[0009] As an improvement to the above scheme, the cross-section of the straight waveguide segment includes a wide side dimension a and a narrow side dimension b, and the ratio e = d / a of the offset d of the centerline of the waveguide radiation slot relative to the centerline of the straight waveguide segment to the wide side dimension a is 0 < e < 0.5.

[0010] As an improvement to the above scheme, the wide side dimension a of the waveguide is 1.37mm≤a≤4mm, the narrow side dimension b of the waveguide is 0.5mm≤b≤3.6mm, and the offset d of the center line of the waveguide radiation slot relative to the center line of the straight waveguide segment is 0.005mm≤d≤1.8mm.

[0011] As an improvement to the above scheme, the serpentine channel extends along the length direction of the waveguide radiating body.

[0012] As an improvement to the above scheme, the other end of the serpentine slow wave slot is provided with a signal discharge port.

[0013] As an improvement to the above scheme, the waveguide radiation slot is strip-shaped.

[0014] The beneficial effects of implementing this utility model are as follows:

[0015] This invention has a simple structure. A serpentine channel is provided on the front end face of the waveguide radiating body. Electromagnetic wave radiation can be achieved through multiple waveguide radiating slots in the serpentine channel. By adopting a coplanar structure for input and output, the manufacturing difficulty and cost can be reduced. Moreover, the overall size is small, and it can be used to manufacture flat antennas and expand into array slot antennas, with a wide range of applications.

[0016] Furthermore, the constructed slow-wave line structure can improve antenna gain. Within a limited operating frequency band, the antenna scanning angle can be increased by adjusting the operating frequency to adapt to applications with high antenna scanning angle requirements, demonstrating high adaptability. Moreover, by offsetting the centerline of the straight waveguide segment from the centerline of its corresponding waveguide radiation slot, the centerline of the waveguide radiation slot can be shifted. Adjusting the shift of the waveguide radiation slot can increase the radiation power, thereby improving the antenna radiation or scanning effect. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the first embodiment of the slow wave plate structure of this utility model;

[0018] Figure 2 is a rear view schematic diagram of the slow wave plate structure of this utility model;

[0019] Figure 3 is a partial structural schematic diagram of the serpentine channel of this utility model;

[0020] Figure 4 is a partial structural schematic diagram of the straight waveguide section of this utility model;

[0021] Figure 5 is a schematic diagram of the second embodiment of the slow wave plate structure of this utility model;

[0022] Figure 6 is a graph showing the offset of the waveguide radiation slot and the equivalent conductivity value of this utility model.

[0023] Figure 7 is a normalized electromagnetic wave pattern of Embodiment 1 of the slow wave plate structure of this utility model;

[0024] Figure 8 is a normalized electromagnetic wave pattern of Embodiment 2 of the slow-wave plate structure of this utility model;

[0025] Figure 9 is a normalized electromagnetic wave pattern of Embodiment 3 of the slow wave plate structure of this utility model;

[0026] Figure 10 is the normalized electromagnetic wave pattern of Embodiment 4 of the slow wave plate structure of this utility model;

[0027] Figure 11 is the normalized electromagnetic wave pattern of Comparative Example 1 of the slow wave plate structure of this utility model.

[0028] Figure 12 is the normalized electromagnetic wave pattern of Comparative Example 2 of the slow-wave plate structure of this utility model. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.

[0030] In this document, references to "embodiment" or "implementation" mean that a particular feature, component, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] As shown in Figures 1 to 3, this utility model provides a schematic diagram of the first embodiment of a slow-wave plate structure, including a waveguide radiating body 1. A serpentine slow-wave groove 2 is provided on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 is provided at one end of the serpentine slow-wave groove 2. A serpentine channel 4 is formed in the serpentine slow-wave groove 2, extending along the length direction of the waveguide radiating body 1. The serpentine channel 4 is connected to the feed signal terminal 3 to realize the transmission of electromagnetic waves. The serpentine channel 4 includes several straight waveguide segments 41 and connecting waveguide segments 42. A gap 5 is left between two adjacent straight waveguide segments 41 to separate them and avoid signal interference. Two adjacent straight waveguide segments 41 are connected by the connecting waveguide segments 42 to construct a slow-wave line structure. Waveguide radiation slots 43 are provided in each of the multiple straight waveguide segments 41. A straight waveguide segment 41 and its adjacent connecting waveguide segment 42 constitute a waveguide unit. This invention enables electromagnetic wave radiation through multiple waveguide radiation slots in a serpentine channel. By adopting a coplanar structure for input and output, it reduces the difficulty and cost of manufacturing. Furthermore, its small overall size makes it suitable for manufacturing flat antennas and expanding into array slot antennas, thus having a wide range of applications.

[0032] Simultaneously, the centerline of the straight waveguide segment 41 is offset from the centerline of its corresponding waveguide radiation slot 43, thereby shifting the centerline of the waveguide radiation slot 43. Adjusting the shift of the waveguide radiation slot 43 increases its equivalent conductivity, thus increasing the electromagnetic wave energy radiated or coupled to the next-level unit, i.e., increasing the radiated power, and consequently improving the antenna radiation or scanning effect. Furthermore, the constructed slow-wave line structure improves antenna gain, and within a limited operating frequency band, adjusting the operating frequency increases the antenna's scanning angle, adapting to applications with high antenna scanning angle requirements, demonstrating high adaptability.

[0033] When signal transmission is required, the external feed terminal connects to the feed signal terminal 3 and sends an electromagnetic wave signal to the feed signal terminal 3. The electromagnetic wave signal is transmitted along the serpentine channel 4 of the serpentine slow wave slot 2. When the electromagnetic wave signal flows through each waveguide radiation slot 43, the electromagnetic wave signal is coupled to the radiating plate through the waveguide radiation slot 43, and then radiated outward through the radiation slot of the radiating plate, realizing the antenna radiation operation. Conversely, when signal reception is required, the electromagnetic wave signal is coupled from the radiating plate through the waveguide radiation slot 43, and then transmitted in reverse through the serpentine channel 4 to the feed signal terminal 3. Finally, the signal is fed back to the antenna processor through the external feed terminal, realizing the antenna signal reception operation.

[0034] Specifically, in this embodiment, the centerline of the waveguide radiation slot 43 is horizontally offset to the right relative to the centerline of the straight waveguide segment 41. Horizontally offsetting the centerline of the waveguide radiation slot 43 to the right increases the radiated power or energy, thereby improving the antenna scanning effect. In other embodiments, the centerline of the waveguide radiation slot 43 can also be horizontally offset to the left, achieving the same technical effect; further details are omitted here.

[0035] As shown in Figures 1 and 4, the centerlines of the multiple waveguide radiation slots 43 have different offsets d to achieve different required radiation power. By setting the offset of the centerlines of the multiple waveguide radiation slots 43, the waveguide radiation body 1 can exhibit a radiation effect that is strong in the middle and weak on both sides, thereby improving the antenna scanning effect. Specifically, when the electromagnetic wave signal is radiating outward, the electromagnetic wave signal is transmitted along the serpentine channel 4. Each time the electromagnetic wave signal flows through a waveguide radiation slot 43, part of its electromagnetic wave energy will be radiated outward through that waveguide radiation slot 43, and the remaining electromagnetic wave energy will continue to flow backward, gradually weakening. By adjusting the offset of the waveguide radiation slots along the direction of the serpentine channel, the antenna radiation effect can exhibit a radiation waveform that is strong in the middle and weak on both sides, thereby improving the antenna radiation intensity and radiation distance, and meeting the user's long-distance antenna scanning requirements.

[0036] Furthermore, the cross-section of the straight waveguide segment 41 includes a wide side dimension a and a narrow side dimension b. The wide side dimension a is the width dimension of the straight waveguide segment 41, and the narrow side dimension b is the depth dimension of the straight waveguide segment 41. The ratio c = b / a of the narrow side dimension b to the wide side dimension a is 0.2 ≤ c ≤ 0.9.

[0037] For example, the ratio c of the narrow side dimension b of the waveguide to the wide side dimension a of the waveguide is 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9, but is not limited to these. When the ratio c is too large, it is easy to cause the waveguide structure and the overall antenna to be large in size and occupy a lot of space, increasing the structural cost; at the same time, the larger the cross-sectional area of ​​the waveguide, the lower the cutoff frequency will be, affecting the application range of the antenna's operating frequency band.

[0038] Furthermore, the ratio e = d / a of the offset d of the centerline of the waveguide radiation slot 43 relative to the centerline of the straight waveguide segment 41 to the width dimension a of the waveguide is 0 < e < 0.5, and the equivalent conductivity of the waveguide radiation slot 43 increases as the ratio e increases.

[0039] For example, the ratio e of the offset of the centerline of the waveguide radiation slot 43 to the width dimension of the waveguide is 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45 and 0.49, but it is not limited to this. When the ratio e is too large, it is easy to affect the equivalent conductivity of the waveguide radiation slot 43, reduce the radiation energy of electromagnetic waves, and thus affect the antenna radiation or scanning effect.

[0040] Wherein, the wide side dimension a of the waveguide is 1.37mm≤a≤4mm, the narrow side dimension b of the waveguide is 0.5mm≤b≤3.6mm, and the offset d of the center line of the waveguide radiation slot 43 relative to the center line of the straight waveguide segment 41 is 0.005mm≤d≤1.8mm. Within this range, the overall volume of the serpentine slow wave slot 2 is small and can take into account both higher intensity radiation energy and longer scanning distance, resulting in the best overall performance.

[0041] For example, the waveguide wide side dimension a is 1.37mm, 1.50mm, 1.75mm, 2.00mm, 2.25mm, 2.3mm, 2.5mm, 2.75mm, 3.0mm, 3.25mm, 3.75mm or 4.0mm, but is not limited thereto.

[0042] For example, the narrow side dimension b of the waveguide is 0.5mm, 1.00mm, 1.50mm, 2.00mm, 2.5mm, 23.0mm, 3.5mm or 3.6mm, but is not limited thereto.

[0043] For example, the offset d of the centerline of the waveguide radiation slot 43 relative to the centerline of the straight waveguide segment 41 is 0.005mm, 0.008mm, 0.0010mm, 0.015mm, 0.020mm, 0.025mm, 0.030mm, 0.035mm, 0.040mm, 0.045mm, 0.050mm, 0.055mm, 0.060mm, 0.065mm, 0.070mm, 0.075mm, 0.080mm, 0.085mm, 0.090mm, 0.095mm, 0.010mm, 0.050mm, 0.100mm, 0.150mm, 0.200mm, 0. 250mm, 0.300mm, 0.350mm, 0.400mm, 0.450mm, 0.500mm, 0.550mm, 0.600mm, 0.650mm, 0.700mm, 0.850mm, 0.900mm, 0.950mm, 1.000mm, 1.050mm, 1.100mm, 1.150mm, 1.200mm, 1.250mm, 1.300mm, 1.350mm, 1.400mm, 1.450mm, 1.500mm, 1.550mm, 1.600mm, 1.650mm, 1.700mm, 1.750mm, or 1.800mm, but not limited to these.

[0044] It should be noted that the wavelength range of the electromagnetic wave can be obtained based on the operating frequency range of the antenna application. For example, the operating frequency range of the W-band is 75~110GHz, corresponding to a wavelength range of approximately 2.73~4mm, and a half-wavelength range of 1.36~2mm. That is, given a specific operating frequency, the wavelength of the corresponding electromagnetic wave can be obtained. The waveguide width dimension 'a' is chosen to be greater than half the wavelength (i.e., half-wavelength): a>λ / 2. The waveguide wavelength λ of this waveguide element can be determined using the waveguide width dimension 'a' and the electromagnetic wave wavelength λ. g As shown in Figure 6, when the waveguide wide side dimension a, the waveguide narrow side dimension b, the electromagnetic wave wavelength λ, and the waveguide wavelength λ... g When the value of is determined, the larger the ratio of the offset of the center line of the waveguide radiation slot 43 to the width dimension of the waveguide, that is, the larger the offset d of the center line of the waveguide radiation slot 43 relative to the center line of the straight waveguide segment 41, the larger the equivalent conductivity of the waveguide radiation slot 43, the greater the radiation energy and radiation power, and the farther the radiation or scanning distance.

[0045] Preferably, each connecting waveguide segment 42 in the serpentine channel 4 is a 180-degree circular arc connecting waveguide segment, which can correspondingly reduce the voltage standing wave ratio (VSWR) of the serpentine waveguide, and correspondingly increase the antenna gain and reduce dissipation, thereby improving the stability of the antenna circuit. The shape of the connecting waveguide segment 42 is not limited to this; it can also be a rectangular connecting waveguide segment or a semi-circular / semi-rectangular connecting waveguide segment, etc.

[0046] To process excess or redundant electromagnetic wave energy, as shown in Figures 1 and 2, the other end of the serpentine slow wave slot 2 is equipped with a signal discharge port 6, which is connected to both the serpentine channel 4 and an external discharge terminal. When electromagnetic waves need to be emitted, the electromagnetic wave signal flows into the serpentine channel 4 through the feed signal terminal 3. On the one hand, the electromagnetic wave signal is coupled to the radiating plate through the waveguide radiation gap 43 of the serpentine channel 4 to radiate the electromagnetic wave signal outward; on the other hand, excess or redundant electromagnetic wave energy in the serpentine channel 4 is discharged outward through the external discharge terminal via the signal discharge port 6 and received by a corresponding external receiving device, thus realizing the absorption and processing of electromagnetic wave energy.

[0047] Preferably, the waveguide radiation slot 43 is strip-shaped, and the two ends of the waveguide radiation slot 43 are semi-circular.

[0048] In some embodiments, the length of the straight waveguide segment 41 of the slow wave plate structure is 2~25mm, the width of the straight waveguide segment 41 is 1.37~4mm, the depth of the straight waveguide segment 41 is 0.5~3.6mm, the length of the connecting waveguide segment 42 is 1.6~25mm, and the width of the gap 5 is 0.25~1mm; the length of the waveguide radiation slot 43 is 1.37~2.5mm, the width of the waveguide radiation slot 43 is 0.1~0.8mm, the offset d of the centerline of the waveguide radiation slot 43 relative to the centerline of the straight waveguide segment 41 is 0.005~1.8mm, the length of the waveguide radiation body 1 is 50~400mm, and the width of the waveguide radiation body 1 is 5~150mm. Slow-wave plate structures within this range are better suited for use in the W-band (75~110GHz) operating range. They can radiate electromagnetic waves that are strong in the middle and weak on both sides, and have the characteristics of small overall size, wide radiation range, strong radiation energy and long radiation distance.

[0049] As shown in Figure 5, this figure illustrates the structure of a second embodiment of the slow-wave plate structure of this utility model. This embodiment differs from the first embodiment shown in Figure 1 in that waveguide radiation slots 43 are spaced apart within the plurality of straight waveguide segments 41. A waveguide radiation slot 43 is provided in each of the multiple straight waveguide segments 41 at intervals. The waveguide radiation slots 43 arranged in this spaced manner increase the phase difference between two adjacent waveguide radiation slots 43, thereby improving the antenna scanning angle, etc. Accordingly, the number of intervals between the straight waveguide segments 41 can be set according to the user's actual antenna requirements, such as providing a waveguide radiation slot 43 every two or three straight waveguide segments 41 to meet the user's actual antenna needs.

[0050] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example

[0051] This invention provides a slow-wave plate structure, including a waveguide radiating body 1. A serpentine slow-wave groove 2 is provided on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 is provided at one end of the serpentine slow-wave groove 2. A serpentine channel 4 is formed in the serpentine slow-wave groove 2, extending along the length direction of the waveguide radiating body 1. The serpentine channel 4 is connected to the feed signal terminal 3 to realize electromagnetic wave transmission. The serpentine channel 4 includes several straight waveguide segments 41 and connecting waveguide segments 42, with a gap 5 between adjacent straight waveguide segments 41. Adjacent straight waveguide segments 41 are connected by the connecting waveguide segments 42 to construct a slow-wave line structure. Waveguide radiation slots 43 are provided in each of the multiple straight waveguide segments 41. A straight waveguide segment 41 and its adjacent connecting waveguide segment 42 constitute a waveguide unit. The centerline of the straight waveguide segment 41 is staggered from the centerline of its corresponding waveguide radiation slot 43.

[0052] In this embodiment, the length of the straight waveguide segment 41 is preferably 9.4 mm, the width of the straight waveguide segment 41 (i.e., the waveguide wide side dimension a) is 2.3 mm, the depth of the straight waveguide segment 41 (i.e., the waveguide narrow side dimension b) is 1.61 mm, the length of the connecting waveguide segment 42 is 4.4 mm, and the width of the gap 5 is 0.5 mm; the length of the waveguide radiation slot 43 is 1.9 mm, the width of the waveguide radiation slot 43 is 0.4 mm, the offset d of the centerline of the waveguide radiation slot 43 relative to the centerline of the straight waveguide segment 41 is 0.02-0.10 mm, the offset d of the centerlines of the multiple waveguide radiation slots 43 relative to the centerline of the straight waveguide segment 41 is different, and the offset first increases and then decreases along the transmission direction of the serpentine channel 4; the length of the waveguide radiation body 1 is 184.8 mm, and the width of the waveguide radiation body 1 is 15 mm.

[0053] In this embodiment, the ratio c of the narrow side dimension b of the waveguide to the wide side dimension a of the waveguide is 0.7, and the ratio e of the offset d of the center line of the waveguide radiation slot 43 relative to the center line of the straight waveguide segment 41 to the wide side dimension a of the waveguide is 0.008≤e≤0.043.

[0054] In this embodiment, the operating frequency is 79-80GHz. Example

[0055] This invention provides a slow-wave plate structure, including a waveguide radiating body 1. A serpentine slow-wave groove 2 is provided on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 is provided at one end of the serpentine slow-wave groove 2. A serpentine channel 4 is formed in the serpentine slow-wave groove 2, extending along the length direction of the waveguide radiating body 1. The serpentine channel 4 is connected to the feed signal terminal 3 to realize electromagnetic wave transmission. The serpentine channel 4 includes several straight waveguide segments 41 and connecting waveguide segments 42, with a gap 5 between adjacent straight waveguide segments 41. Adjacent straight waveguide segments 41 are connected by the connecting waveguide segments 42 to construct a slow-wave line structure. Waveguide radiation slots 43 are provided in each of the multiple straight waveguide segments 41. A straight waveguide segment 41 and its adjacent connecting waveguide segment 42 constitute a waveguide unit. The centerline of the straight waveguide segment 41 is staggered from the centerline of its corresponding waveguide radiation slot 43.

[0056] The length of the straight waveguide segment 41 is preferably 3 mm, the width of the straight waveguide segment 41 (i.e., the wide side dimension a) is 2.3 mm, the depth of the straight waveguide segment 41 (i.e., the narrow side dimension b) is 1.61 mm, the length of the connecting waveguide segment 42 is 4.4 mm, and the width of the gap 5 is 0.5 mm; the length of the waveguide radiation slot 43 is 1.9 mm, the width of the waveguide radiation slot 43 is 0.4 mm, the offset d of the center line of the waveguide radiation slot 43 relative to the center line of the straight waveguide segment 41 is 0.02-0.10 mm, the offset d of the center lines of the multiple waveguide radiation slots 43 relative to the center line of the straight waveguide segment 41 is different, and the offset first increases and then decreases along the transmission direction of the serpentine channel 4; the length of the waveguide radiation body 1 is 184.8 mm, and the width of the waveguide radiation body 1 is 15 mm. It should be noted that when the length of the straight waveguide segment 41 or the connecting waveguide segment 42 changes, it will affect the antenna beam scanning pointing angle to a certain extent and reduce the antenna scanning angle.

[0057] In this embodiment, the ratio c of the narrow side dimension b of the waveguide to the wide side dimension a of the waveguide is 0.7, and the ratio e of the offset d of the center line of the waveguide radiation slot 43 relative to the center line of the straight waveguide segment 41 to the wide side dimension a of the waveguide is 0.008≤e≤0.043.

[0058] In this embodiment, the operating frequency is 79-80GHz. Example

[0059] This invention provides a slow-wave plate structure, including a waveguide radiating body 1. A serpentine slow-wave groove 2 is provided on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 is provided at one end of the serpentine slow-wave groove 2. A serpentine channel 4 is formed in the serpentine slow-wave groove 2, extending along the length direction of the waveguide radiating body 1. The serpentine channel 4 is connected to the feed signal terminal 3 to realize electromagnetic wave transmission. The serpentine channel 4 includes several straight waveguide segments 41 and connecting waveguide segments 42, with a gap 5 between adjacent straight waveguide segments 41. Adjacent straight waveguide segments 41 are connected by the connecting waveguide segments 42 to construct a slow-wave line structure. Waveguide radiation slots 43 are provided in each of the multiple straight waveguide segments 41. A straight waveguide segment 41 and its adjacent connecting waveguide segment 42 constitute a waveguide unit. The centerline of the straight waveguide segment 41 is staggered from the centerline of its corresponding waveguide radiation slot 43.

[0060] The length of the straight waveguide segment 41 is preferably 9.4 mm, the width (i.e., the wide side dimension a) of the straight waveguide segment 41 is 2.3 mm, the depth (i.e., the narrow side dimension b) of the straight waveguide segment 41 is 1.61 mm, the length of the connecting waveguide segment is 4.4 mm, and the width of the gap 5 is 0.5 mm; the length of the waveguide radiation slot 43 is 1.9 mm, the width of the waveguide radiation slot 43 is 0.4 mm, the offset d of the centerline of the waveguide radiation slot 43 relative to the centerline of the straight waveguide segment 41 is 0.07-0.13 mm, the offset d of the centerlines of the multiple waveguide radiation slots 43 relative to the centerline of the straight waveguide segment 41 is different, and the offset first increases and then decreases along the transmission direction of the serpentine channel 4; the length of the waveguide radiation body 1 is 89.6 mm, and the width of the waveguide radiation body 1 is 15 mm. It should be noted that when the length of the waveguide radiating body 1 is reduced, in order to retain better performance effects such as antenna gain and sidelobe level, the offset of the center line of the waveguide radiating slot 43 relative to the center line of the straight waveguide segment 41 can be adjusted accordingly to adapt to the shorter serpentine slow wave plate.

[0061] In this embodiment, the ratio c of the narrow side dimension b of the waveguide to the wide side dimension a of the waveguide is 0.7, and the ratio e of the offset d of the center line of the waveguide radiation slot 43 relative to the center line of the straight waveguide segment 41 to the wide side dimension a of the waveguide is 0.030≤e≤0.056.

[0062] In this embodiment, the operating frequency is 79-80GHz. Example

[0063] This invention provides a slow-wave plate structure, including a waveguide radiating body 1. A serpentine slow-wave groove 2 is provided on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 is provided at one end of the serpentine slow-wave groove 2. A serpentine channel 4 is formed in the serpentine slow-wave groove 2, extending along the length direction of the waveguide radiating body 1. The serpentine channel 4 is connected to the feed signal terminal 3 to realize electromagnetic wave transmission. The serpentine channel 4 includes several straight waveguide segments 41 and connecting waveguide segments 42, with a gap 5 between adjacent straight waveguide segments 41. Adjacent straight waveguide segments 41 are connected by the connecting waveguide segments 42 to construct a slow-wave line structure. Waveguide radiation slots 43 are provided in each of the multiple straight waveguide segments 41. A straight waveguide segment 41 and its adjacent connecting waveguide segment 42 constitute a waveguide unit. The centerline of the straight waveguide segment 41 is staggered from the centerline of its corresponding waveguide radiation slot 43.

[0064] The length of the straight waveguide segment 41 is preferably 8 mm, the width (i.e., the wide side dimension a) of the straight waveguide segment 41 is 1.96 mm, the depth (i.e., the narrow side dimension b) of the straight waveguide segment 41 is 1.37 mm, the length of the connecting waveguide segment 42 is 3.74 mm, and the width of the gap 5 is 0.425 mm; the length of the waveguide radiation slot 43 is 1.62 mm, the width of the waveguide radiation slot 43 is 0.34 mm, the offset d of the centerline of the waveguide radiation slot 43 relative to the centerline of the straight waveguide segment 41 is 0.017-0.085 mm, the offset d of the centerlines of the multiple waveguide radiation slots 43 relative to the centerline of the straight waveguide segment 41 is different, and the offset first increases and then decreases along the transmission direction of the serpentine channel 4; the length of the waveguide radiation body 1 is 157.7 mm, and the width of the waveguide radiation body 1 is 12.75 mm.

[0065] In this embodiment, the ratio c of the narrow side dimension b of the waveguide to the wide side dimension a of the waveguide is 0.7, and the ratio e of the offset d of the center line of the waveguide radiation slot 43 relative to the center line of the straight waveguide segment 41 to the wide side dimension a of the waveguide is 0.008≤e≤0.043.

[0066] In this embodiment, the operating frequency is 92-93 GHz.

[0067] By proportionally adjusting the aforementioned parameters of the waveguide radiating body, it is possible to adapt to scanning operations in different operating frequency bands and obtain better antenna radiation performance.

[0068] Comparative Example 1

[0069] This invention provides a slow-wave plate structure, including a waveguide radiating body 1. A serpentine slow-wave groove 2 is provided on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 is provided at one end of the serpentine slow-wave groove 2. A serpentine channel 4 is formed in the serpentine slow-wave groove 2, extending along the length direction of the waveguide radiating body 1. The serpentine channel 4 is connected to the feed signal terminal 3 to realize electromagnetic wave transmission. The serpentine channel 4 includes several straight waveguide segments 41 and connecting waveguide segments 42, with a gap 5 between adjacent straight waveguide segments 41. Adjacent straight waveguide segments 41 are connected by the connecting waveguide segments 42 to construct a slow-wave line structure. Waveguide radiation slots 43 are provided in each of the multiple straight waveguide segments 41. A straight waveguide segment 41 and its adjacent connecting waveguide segment 42 constitute a waveguide unit. The centerline of the straight waveguide segment 41 is staggered from the centerline of its corresponding waveguide radiation slot 43.

[0070] In this embodiment, the length of the straight waveguide segment 41 is preferably 9.4 mm, the width of the straight waveguide segment 41 (i.e., the wide side dimension a) is 2.3 mm, the depth of the straight waveguide segment 41 (the narrow side dimension b) is 1.61 mm, the length of the connecting waveguide segment 42 is 4.4 mm, and the width of the gap 5 is 0.5 mm; the length of the waveguide radiation slot 43 is 1.9 mm, the width of the waveguide radiation slot 43 is 0.4 mm, the offset d of the centerline of the waveguide radiation slot 43 relative to the centerline of the straight waveguide segment 41 is 0.05 mm, the length of the waveguide radiation body 1 is 184.8 mm, and the width of the waveguide radiation body 1 is 15 mm.

[0071] In this embodiment, the ratio c of the narrow side dimension b of the waveguide to the wide side dimension a of the waveguide is 0.7, and the ratio e of the offset d of the center line of the waveguide radiation slot 43 relative to the center line of the straight waveguide segment 41 to the wide side dimension a of the waveguide is 0.021.

[0072] In this embodiment, the operating frequency is 79-80GHz.

[0073] Comparative Example 2

[0074] This invention provides a slow-wave plate structure, including a waveguide radiating body 1. A serpentine slow-wave groove 2 is provided on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 is provided at one end of the serpentine slow-wave groove 2. A serpentine channel 4 is formed in the serpentine slow-wave groove 2, extending along the length direction of the waveguide radiating body 1. The serpentine channel 4 is connected to the feed signal terminal 3 to realize electromagnetic wave transmission. The serpentine channel 4 includes several straight waveguide segments 41 and connecting waveguide segments 42, with a gap 5 between adjacent straight waveguide segments 41. Adjacent straight waveguide segments 41 are connected by the connecting waveguide segments 42 to construct a slow-wave line structure. Waveguide radiation slots 43 are provided in each of the multiple straight waveguide segments 41. A straight waveguide segment 41 and its adjacent connecting waveguide segment 42 constitute a waveguide unit. The centerline of the straight waveguide segment 41 coincides with the centerline of its corresponding waveguide radiation slot 43.

[0075] In this embodiment, the length of the straight waveguide segment 41 is preferably 9.4 mm, the width of the straight waveguide segment 41 (i.e., the waveguide wide side dimension a) is 2.3 mm, the depth of the straight waveguide segment 41 (i.e., the waveguide narrow side dimension b) is 1.61 mm, the length of the connecting waveguide segment 42 is 4.4 mm, and the width of the gap 5 is 0.5 mm; the length of the waveguide radiation slot 43 is 1.9 mm, the width of the waveguide radiation slot 43 is 0.4 mm, the offset d of the centerline of the waveguide radiation slot 43 relative to the centerline of the straight waveguide segment 41 is 0 mm, the length of the waveguide radiation body 1 is 184.8 mm, and the width of the waveguide radiation body 1 is 15 mm.

[0076] In this embodiment, the ratio c of the narrow side dimension b to the wide side dimension a of the waveguide is 0.7, and the ratio e of the offset d of the centerline of the waveguide radiation slot 43 relative to the centerline of the straight waveguide segment 41 to the wide side dimension a of the waveguide is 0. In this embodiment, the operating frequency is 79-80 GHz.

[0077] The performance of the slow-wave plate structures prepared in Examples 1 to 4 and Comparative Examples 1 to 2 was tested, and the normalized electromagnetic wave radiation patterns shown in Figures 7 to 12 were obtained. The test results are shown in Table 1 below:

[0078] Table 1 Test Results

[0079]

[0080] As can be seen from the above test results and the normalized radiation pattern of electromagnetic waves, compared with comparative examples 1 to 2, these embodiments 1 to 4 have lower sidelobe levels and higher antenna gain, and their radiation range and distance are relatively longer, resulting in better electromagnetic wave radiation or scanning effects.

[0081] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A slow-wave plate structure, characterized in that, It includes a waveguide radiating body, and a serpentine slow wave groove is provided on the front end surface of the waveguide radiating body, and a feed signal terminal is provided at one end of the serpentine slow wave groove; A serpentine channel is formed in the serpentine slow wave slot. The serpentine channel is connected to the feed signal terminal. The serpentine channel includes several straight waveguide segments and connecting waveguide segments. A gap is left between two adjacent straight waveguide segments. Two adjacent straight waveguide segments are connected by the connecting waveguide segments. Waveguide radiation slots are provided at intervals or individually in the plurality of straight waveguide segments.

2. The slow-wave plate structure as described in claim 1, characterized in that, The centerline of the straight waveguide segment is offset from the centerline of its corresponding waveguide radiation slot.

3. The slow-wave plate structure as described in claim 2, characterized in that, The centerlines of the multiple waveguide radiation slots have different offsets.

4. The slow-wave plate structure as described in claim 1, characterized in that, The cross-section of the straight waveguide segment includes a wide side dimension a and a narrow side dimension b. The ratio of the offset d of the centerline of the waveguide radiation slot relative to the centerline of the straight waveguide segment to the wide side dimension a, e = d / a, is 0 < e < 0.

5.

5. The slow-wave plate structure as described in claim 4, characterized in that, The wide side dimension a of the waveguide is 1.37mm≤a≤4mm, the narrow side dimension b of the waveguide is 0.5mm≤b≤3.6mm, and the offset d of the centerline of the waveguide radiation slot relative to the centerline of the straight waveguide segment is 0.005mm≤d≤1.8mm.

6. The slow-wave plate structure as described in claim 1, characterized in that, The serpentine channel extends along the length of the waveguide radiating body.

7. The slow-wave plate structure as described in claim 1, characterized in that, The other end of the serpentine slow wave slot is provided with a signal discharge port.

8. The slow-wave plate structure as described in claim 1, characterized in that, The waveguide radiation slot is strip-shaped.

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