Serpentine slow-wave plate

Abstract

Disclosed in the present invention is a serpentine slow-wave plate, comprising a waveguide radiation body, wherein a serpentine slow-wave groove is provided on a front end surface of the waveguide radiation body, 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 linear waveguide segments and connecting waveguide segments, a gap portion is reserved between two adjacent linear waveguide segments, and two adjacent linear waveguide segments are connected by means of a connecting waveguide segment; the plurality of linear waveguide segments are provided with waveguide radiation slots at intervals or are respectively provided with the waveguide radiation slots, and the center lines of the linear waveguide segments are arranged offset from the center lines of the waveguide radiation slots corresponding to the linear waveguide segments; and the center lines of the plurality of waveguide radiation slots have different offsets. The present invention has the advantages of simple structure, low cost, good radiation effect and wide application range.

Description

A snake-shaped slow wave plate Technical Field

[0001] This invention relates to the field of antenna technology, and more particularly to a serpentine slow-wave plate. Background Technology

[0002] A serpentine slow-wave plate 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 serpentine slow-wave plates. These plates include 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 direction of extension 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 spaced along a straight line, with each waveguide radiation slot 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] However, the aforementioned serpentine slow wave line structure achieves input and output through a serpentine slow wave line on one end face and a waveguide radiation slot on the other end face adjacent to that end face. The input electromagnetic wave signal flows along the channel of the serpentine slow wave line, and part of the signal is radiated outward from the waveguide radiation slot on the side. Its input and output are not coplanar, resulting in a large overall volume, high cost, and difficulty in manufacturing into a flat antenna. Moreover, its electromagnetic wave radiation effect is poor. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a serpentine slow wave plate, which has the advantages of simple structure, low cost, good radiation effect and wide applicability.

[0005] To address the aforementioned technical problems, this invention provides a serpentine slow-wave plate, 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 being connected to the feed signal terminal, the serpentine channel comprising a plurality of straight waveguide segments and connecting waveguide segments, with a gap between adjacent straight waveguide segments, and adjacent straight waveguide segments being connected by the connecting waveguide segments; waveguide radiation slots are spaced apart among the plurality of straight waveguide segments or are provided separately, the centerline of each straight waveguide segment being offset from the centerline of its corresponding waveguide radiation slot; the centerlines of the plurality of waveguide radiation slots have different offsets.

[0006] As an improvement to the above scheme, the centerline of the waveguide radiation slot is offset horizontally to the right or horizontally to the left relative to the centerline of the straight waveguide segment.

[0007] 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. 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. The equivalent conductivity of the waveguide radiation slot increases as the ratio e increases.

[0008] As an improvement to the above scheme, the ratio c = b / a of the narrow side dimension b of the waveguide to the wide side dimension a of the waveguide is 0.2 ≤ c ≤ 0.9.

[0009] 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.

[0010] As an improvement to the above scheme, the serpentine channel extends along the length direction of the waveguide radiating body.

[0011] As an improvement to the above scheme, the other end of the serpentine slow wave slot is provided with a signal discharge port.

[0012] As an improvement to the above scheme, the waveguide radiation slot is strip-shaped.

[0013] As an improvement to the above scheme, the length of the straight waveguide segment is 2~25mm, the width of the straight waveguide segment is 1.37~4mm, the depth of the straight waveguide segment is 0.5~3.6mm, the length of the connecting waveguide segment is 1.6~25mm, and the width of the gap is 0.25~1mm; the length of the waveguide radiation slot is 1.37~2.5mm, the width of the waveguide radiation slot is 0.1~0.8mm, and the offset d of the centerline of the waveguide radiation slot relative to the centerline of the straight waveguide segment is 0.005~1.8mm.

[0014] As an improvement to the above scheme, the length of the waveguide radiating body is 50~400mm, and the width of the waveguide radiating body is 5~150mm.

[0015] The beneficial effects of implementing this invention are as follows:

[0016] 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 of 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 extended into array slot antennas, with a wide range of applications.

[0017] Meanwhile, the constructed slow-wave line structure can improve antenna gain, and the scanning angle of the antenna can be increased by adjusting the operating frequency within a limited operating frequency band to adapt to applications with high antenna scanning angle requirements, thus exhibiting high adaptability. Furthermore, by offsetting the center line of the straight waveguide segment from the center line of its corresponding waveguide radiation slot, the center line 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

[0018] Figure 1 is a structural schematic diagram of the first embodiment of the serpentine slow wave plate of the present invention;

[0019] Figure 2 is a rear view schematic diagram of the serpentine slow wave plate of the present invention;

[0020] Figure 3 is a partial structural schematic diagram of the serpentine channel of the present invention;

[0021] Figure 4 is a partial structural schematic diagram of the straight waveguide section of the present invention;

[0022] Figure 5 is a structural schematic diagram of a second embodiment of the serpentine slow wave plate of the present invention;

[0023] Figure 6 is a graph showing the offset of the waveguide radiation slot of the present invention versus the equivalent conductivity.

[0024] Figure 7 is a normalized electromagnetic wave pattern of Embodiment 1 of the serpentine slow wave plate of the present invention;

[0025] Figure 8 is a normalized electromagnetic wave pattern of Embodiment 2 of the serpentine slow wave plate of the present invention;

[0026] Figure 9 is a normalized electromagnetic wave pattern of Embodiment 3 of the serpentine slow wave plate of the present invention;

[0027] Figure 10 is a normalized electromagnetic wave pattern of Embodiment 4 of the serpentine slow wave plate of the present invention.

[0028] Figure 11 is a normalized electromagnetic wave pattern of Comparative Example 1 of the serpentine slow wave plate of the present invention.

[0029] Figure 12 is the normalized radiation pattern of the electromagnetic wave of Comparative Example 2 of the serpentine slow wave plate of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. 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 the invention, and should not be construed as limiting the invention. Furthermore, it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0031] 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.

[0032] As shown in Figures 1 to 3, the present invention provides a schematic diagram of the structure of a first embodiment of a serpentine slow-wave plate, including a waveguide radiating body 1. A serpentine slow-wave groove 2 is provided on the front end surface 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 43 in the serpentine channel 4. By adopting a coplanar structure for input and output, it reduces the difficulty and cost of processing and manufacturing. Moreover, the overall size is small, making it suitable for manufacturing into flat antennas and expanding into array slot antennas, thus having a wide range of applications.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] For example, the ratio e of the offset of the centerline of the waveguide radiation slot 43 relative to the centerline of the straight waveguide segment 41 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 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] Preferably, the waveguide radiation slot 43 is strip-shaped, and the two ends of the waveguide radiation slot 43 are semi-circular.

[0049] In some embodiments, the straight waveguide segment 41 of the serpentine slow wave plate has a length of 2-25 mm, a width of 1.37-4 mm, a depth of 0.5-3.6 mm, a length of 1.6-25 mm for the connecting waveguide segment 42, and a width of 0.25-1 mm for the gap portion 5; the waveguide radiation slot 43 has a length of 1.37-2.5 mm, a width of 0.1-0.8 mm, an offset d of the centerline of the waveguide radiation slot 43 relative to the centerline of the straight waveguide segment 41 of 0.005-1.8 mm, a length of 50-400 mm for the waveguide radiation body 1, and a width of 5-150 mm for the waveguide radiation body 1. Within this range, the serpentine slow-wave plate can be better applied in the W-band (75~110GHz) operating range. It can radiate electromagnetic waves that are strong in the middle and weak on both sides. It has the characteristics of small overall size, wide radiation range, strong radiation energy and long radiation distance.

[0050] As shown in Figure 5, this embodiment of the serpentine slow-wave plate of the present invention is a schematic diagram. 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 interval 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.

[0051] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example

[0052] This invention provides a serpentine slow-wave plate, comprising a waveguide radiating body 1, a serpentine slow-wave groove 2 on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 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, and 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, and waveguide radiation slots 43 are respectively provided in 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.

[0053] 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.

[0054] 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.

[0055] In this embodiment, the operating frequency is 79-80GHz. Example

[0056] This invention provides a serpentine slow-wave plate, comprising a waveguide radiating body 1, a serpentine slow-wave groove 2 on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 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, and 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, and waveguide radiation slots 43 are respectively provided in 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.

[0057] 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.

[0058] 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.

[0059] In this embodiment, the operating frequency is 79-80GHz. Example

[0060] This invention provides a serpentine slow-wave plate, comprising a waveguide radiating body 1, a serpentine slow-wave groove 2 on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 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, and 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, and waveguide radiation slots 43 are respectively provided in 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.

[0061] 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.

[0062] 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.

[0063] In this embodiment, the operating frequency is 79-80GHz. Example

[0064] This invention provides a serpentine slow-wave plate, comprising a waveguide radiating body 1, a serpentine slow-wave groove 2 on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 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, and 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, and waveguide radiation slots 43 are respectively provided in 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.

[0065] 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.

[0066] 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.

[0067] In this embodiment, the operating frequency is 92-93 GHz.

[0068] 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.

[0069] Comparative Example 1

[0070] This invention provides a serpentine slow-wave plate, comprising a waveguide radiating body 1, a serpentine slow-wave groove 2 on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 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, and 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, and waveguide radiation slots 43 are respectively provided in 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.

[0071] 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.

[0072] 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.

[0073] In this embodiment, the operating frequency is 79-80GHz.

[0074] Comparative Example 2

[0075] This invention provides a serpentine slow-wave plate, comprising a waveguide radiating body 1, a serpentine slow-wave groove 2 on the front end face of the waveguide radiating body 1, and a feed signal terminal 3 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, and 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, and waveguide radiation slots 43 are respectively provided in 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.

[0076] 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.

[0077] 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 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.

[0078] In this embodiment, the operating frequency is 79-80GHz.

[0079] The performance of the serpentine slow-wave plates 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:

[0080] Table 1 Test Results

[0081]

[0082] 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.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. 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 invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A serpentine slow-wave plate, 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. The multiple straight waveguide segments are provided with waveguide radiation slots at intervals or are provided separately, and the centerline of the straight waveguide segment is staggered from the centerline of the corresponding waveguide radiation slot.

2. The serpentine slow-wave plate as described in claim 1, characterized in that, The centerline of the waveguide radiation slot is offset horizontally to the right or horizontally to the left relative to the centerline of the straight waveguide segment.

3. The serpentine slow-wave plate 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 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. The equivalent conductivity of the waveguide radiation slot increases as the ratio e increases.

4. The serpentine slow-wave plate as described in claim 3, characterized in that, The ratio c = b / a of the narrow side dimension b of the waveguide to the wide side dimension a of the waveguide is 0.2 ≤ c ≤ 0.

9.

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

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

9. The serpentine slow-wave plate as described in any one of claims 1 to 8, characterized in that, The length of the straight waveguide segment is 2~25mm, the width of the straight waveguide segment is 1.37~4mm, the depth of the straight waveguide segment is 0.5~3.6mm, the length of the connecting waveguide segment is 1.6~25mm, and the width of the gap is 0.25~1mm; the length of the waveguide radiation slot is 1.37~2.5mm, the width of the waveguide radiation slot is 0.1~0.8mm, and the offset d of the centerline of the waveguide radiation slot relative to the centerline of the straight waveguide segment is 0.005~1.8mm.

10. The serpentine slow-wave plate as described in claim 9, characterized in that, The length of the waveguide radiating body is 50~400mm, and the width of the waveguide radiating body is 5~150mm.

Images