Snakelike slow wave plate

Abstract

The invention discloses a snakelike slow wave plate which comprises a waveguide radiation body, a snakelike slow wave groove is formed in the front end face of the waveguide radiation body, and a feed signal end is arranged at one end of the snakelike slow wave groove. A snakelike channel is formed in the snakelike slow wave slot, the snakelike channel is connected with the feed signal end, the snakelike channel comprises a plurality of linear waveguide sections and connecting waveguide sections, a gap part is reserved between every two adjacent linear waveguide sections, and every two adjacent linear waveguide sections are connected through the corresponding connecting waveguide section; waveguide radiation slots are arranged at intervals in the plurality of linear waveguide sections or the waveguide radiation slots are respectively arranged in the plurality of linear waveguide sections, and the central lines of the linear waveguide sections and the central lines of the corresponding waveguide radiation slots are arranged in a staggered manner; and the center lines of the plurality of waveguide radiation slots have different offsets. The antenna has the advantages of simple structure, low cost, good radiation effect, wide application range and the like.

Description

Technical Field

[0001] The invention relates to the technical field of antennas, and in particular to a serpentine slow-wave plate. Background Art

[0002] The serpentine slow-wave plate is an antenna with a slit on the wide or narrow wall of a waveguide, and the electromagnetic waves transmitted in the waveguide can be radiated to the outside through the slit. This type of antenna is commonly used in microwave frequency bands and can be used in fields such as communications, radars, and satellite communications. At present, some independent waveguide slot antennas are composed of a serpentine slow-wave plate, which includes a first structural member and a second structural member. The lower surface of the first structural member is arrayed with a plurality of long protrusions along its extension direction, and the long protrusions are perpendicular to the extension direction of the first structural member; the upper surface of the second structural member is arrayed with a plurality of rectangular ridge structures along its extension direction, and the rectangular ridge structures and the long protrusions are arranged at intervals in the waveguide structure; the upper surface of the first structural member is provided with a plurality of waveguide radiation slits spaced along a straight line direction, and the waveguide radiation slits correspond to the rectangular ridge structures one by one and the waveguide radiation slits are located directly above the rectangular ridge structures; the inner cavity between the rectangular ridge structures and the long protrusions in the waveguide structure constitutes a serpentine slow-wave line.

[0003] However, the above-mentioned serpentine slow-wave line structure realizes input and output through the serpentine slow-wave line on one end face and the waveguide radiation slot on the other end face adjacent to the end face. The input electromagnetic wave signal flows along the channel of the serpentine slow-wave line, and part of the signal radiates 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 inconvenience in manufacturing into a flat antenna. In addition, 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 application range.

[0005] In order to solve the above technical problems, the present invention provides a serpentine slow-wave plate, comprising a waveguide radiation body, a serpentine slow-wave groove is provided on the front end surface of the waveguide radiation body, and a feeding signal end is provided 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 feeding signal end, the serpentine channel comprises 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 segment; waveguide radiation slots are provided at intervals between the plurality of straight waveguide segments or the waveguide radiation slots are provided respectively, the center lines of the straight waveguide segments are staggered with the center lines of the corresponding waveguide radiation slots; the center lines of the plurality of waveguide radiation slots have different offsets.

[0006] As an improvement of the above solution, the center line of the waveguide radiation slot is horizontally offset to the right or to the left relative to the center line of the straight waveguide section.

[0007] As an improvement of the above scheme, the cross-section of the straight waveguide segment includes a waveguide wide side dimension a and a waveguide narrow side dimension b, and the ratio of the offset d of the center line of the waveguide radiation slot to the waveguide wide side dimension a, e=d / a, is 0<e<0.5, and the equivalent conductance value of the waveguide radiation slot increases with the increase of the ratio e.

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

[0009] As an improvement of the above solution, the waveguide wide side dimension a is 1.37mm≤a≤4mm, the waveguide narrow side dimension b is 0.5mm≤b≤3.6mm, and the offset d of the center line of the waveguide radiation slot is 0.005mm≤d≤1.8mm.

[0010] As an improvement of the above solution, the serpentine channel is extended along the length direction of the waveguide radiation body.

[0011] As an improvement of the above solution, a signal discharge port is provided at the other end of the serpentine slow-wave slot.

[0012] As an improvement of the above solution, the waveguide radiation slot is in a strip shape.

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

[0014] As an improvement of the above solution, the length of the waveguide radiation body is 50-400 mm, and the width of the waveguide radiation body is 5-150 mm.

[0015] The beneficial effects of implementing the present invention are:

[0016] The present invention has a simple structure. A serpentine channel is arranged on the front end face of the waveguide radiation body. Electromagnetic wave radiation can be realized through multiple waveguide radiation slots in the serpentine channel. The input and output coplanar structures are adopted to reduce the difficulty and cost of processing and manufacturing. The overall volume is small, and the antenna can be suitable for manufacturing into a flat antenna and expanding into an array slot antenna, with a wide range of applications.

[0017] At the same time, the antenna gain can be improved by constructing a slow-wave line structure, and the scanning angle of the antenna can be improved by adjusting the operating frequency within a limited operating frequency band to adapt to applications with higher antenna scanning angle requirements, with high adaptability; and by staggering the center line of the straight waveguide segment and the center line of the corresponding waveguide radiation slot, the offset of the center line of the waveguide radiation slot can be achieved, and the radiation power can be increased by adjusting the offset of the waveguide radiation slot, thereby improving the antenna radiation or scanning effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0021] Figure 4 It is a schematic diagram of the local structure of the straight waveguide section of the present invention;

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

[0023] Figure 6 is a curve diagram of the offset of the waveguide radiation slot and the equivalent conductance value of the present invention;

[0024] Figure 7 is the normalized directivity diagram of the electromagnetic wave of the embodiment 1 of the serpentine slow-wave plate of the present invention;

[0025] Figure 8 is the normalized directivity diagram of the electromagnetic wave of Example 2 of the serpentine slow-wave plate of the present invention;

[0026] Fig. 9 is the normalized directivity diagram of the electromagnetic wave of Example 3 of the serpentine slow-wave plate of the present invention;

[0027] Fig.10 is the normalized directivity diagram of the electromagnetic wave of Example 4 of the serpentine slow-wave plate of the present invention;

[0028] Fig.11is the normalized directivity diagram of the electromagnetic wave of Comparative Example 1 of the serpentine slow-wave plate of the present invention;

[0029] Fig.12 It is the normalized directivity diagram of the electromagnetic wave of comparative example 2 of the serpentine slow-wave plate of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. In addition, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] Reference to "embodiment" or "implementation" herein means that a particular feature, component, or characteristic described in conjunction with the embodiment or implementation may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] like Figures 1 to 3 As shown, the present invention provides a schematic structural diagram of a first embodiment of a serpentine slow-wave plate, comprising a waveguide radiation body 1, a serpentine slow-wave slot 22 is provided on the front end surface of the waveguide radiation body 1, and a feed signal terminal 3 is provided at one end of the serpentine slow-wave slot 22; a serpentine channel 4 is formed in the serpentine slow-wave slot 22, and the serpentine channel 4 is extended along the length direction of the waveguide radiation body 1, and the serpentine channel 4 is connected to the feed signal terminal 3 to realize the transmission of electromagnetic waves. The serpentine channel 4 includes a plurality of straight waveguide segments 41 and a connecting waveguide segment 42, and a gap 5 is left between two adjacent straight waveguide segments 41 to separate the two straight waveguide segments 41 to avoid signal interference. The adjacent two straight waveguide segments 41 are connected by the connecting waveguide segment 42 to construct a slow-wave line structure, and waveguide radiation gaps 43 are respectively provided in the plurality of straight waveguide segments 41. Among them, a straight waveguide segment 41 and a connecting waveguide segment 42 adjacent to it constitute a waveguide unit. The present invention can realize electromagnetic wave radiation through multiple waveguide radiation slots in the serpentine channel, and can reduce the difficulty and cost of processing and manufacturing by adopting the coplanar structure of input and output. It has a small overall volume and can be suitable for manufacturing into a flat antenna and expanding into an array slot antenna, and has a wide range of applications.

[0033] At the same time, the center line of the straight waveguide section 41 is staggered with the center line of the corresponding waveguide radiation slot 43 to achieve the offset of the center line of the waveguide radiation slot 43. By adjusting the offset of the waveguide radiation slot 43, its equivalent conductance value can be increased, thereby increasing the electromagnetic wave energy radiated or coupled to the lower unit, that is, the radiation power can be increased, and then the antenna radiation or scanning effect can be improved. In addition, the constructed slow wave line structure can improve the antenna gain, and the scanning angle of the antenna can be increased by adjusting the working frequency within a limited working frequency band to adapt to applications with high antenna scanning angle requirements, and the adaptability is high.

[0034] When a signal needs to be transmitted, the external feed end is connected to the feed signal end 3 and sends an electromagnetic wave signal to the feed signal end 3, and the electromagnetic wave signal is transmitted along the serpentine channel 4 of the serpentine slow wave slot 22; when the electromagnetic wave signal flows through each waveguide radiation gap 43, the electromagnetic wave signal is coupled to the radiation plate through the waveguide radiation gap 43, and the electromagnetic wave signal is radiated outward through the radiation gap of the radiation plate to realize the antenna radiation work. On the contrary, when a signal needs to be received, the electromagnetic wave signal is coupled and received from the radiation plate through the waveguide radiation gap 43, and then the signal is reversely transmitted to the feed signal end 3 through the serpentine channel 4, and finally the signal is fed back to the antenna processor through the external feed end to realize the antenna signal reception work.

[0035] Specifically, in this embodiment, the center line of the waveguide radiation slot 43 is horizontally offset to the right relative to the center line of the straight waveguide section 41. By horizontally offsetting the center line of the waveguide radiation slot 43 to the right, the radiation power or radiation energy can be increased, thereby improving the antenna scanning effect. In other embodiments, the center line of the waveguide radiation slot 43 can also be horizontally offset to the left, which can also achieve the same technical effect, and will not be described in detail here.

[0036] like Figure 1 and Figure 4 As shown, the center lines of the plurality of waveguide radiation slots 43 have different offsets d to achieve different required radiation powers. By setting the offset of the center lines of the plurality of waveguide radiation slots 43, the waveguide radiation body 1 presents a radiation effect that is strong in the middle and weak on both sides, thereby improving the antenna scanning effect. Among them, when the electromagnetic wave signal radiates outward, the electromagnetic wave signal is transmitted along the serpentine channel 4. Every time the electromagnetic wave signal flows through a waveguide radiation slot 43, part of its electromagnetic wave energy will be radiated outward through the waveguide radiation slot 43, and the remaining electromagnetic wave energy will continue to flow backward, and the energy will gradually weaken. By adjusting the offset of the waveguide radiation slot along the direction of the serpentine channel, the antenna radiation effect presents 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 antenna long-distance scanning needs.

[0037] Furthermore, the cross-section of the straight waveguide section 41 includes a waveguide wide side dimension a and a waveguide narrow side dimension b, the waveguide wide side dimension a is the width dimension of the straight waveguide section 41, the waveguide narrow side dimension b is the depth dimension of the straight waveguide section 41, and the ratio of the waveguide narrow side dimension b to the waveguide wide side dimension a, c=b / a, is 0.2≤c≤0.9.

[0038] Exemplarily, the ratio c of the waveguide narrow side dimension b to the waveguide wide side dimension a is 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9, but is not limited to this. 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 large space, thereby increasing the structural cost; at the same time, the larger the cross-sectional area of ​​the waveguide, the lower the cutoff frequency, which affects the application range of the antenna working frequency band.

[0039] Furthermore, the ratio of the offset d of the center line of the waveguide radiation slot to the waveguide wide side dimension a, e=d / a, is 0<e<0.5, and the equivalent conductance value of the waveguide radiation slot increases with the increase of the ratio e.

[0040] Exemplarily, the ratio e of the offset of the center line of the waveguide radiation slot 43 to the width 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 conductance value of the waveguide radiation slot 43, reduce the radiation energy of the electromagnetic wave, and thus affect the antenna radiation or scanning effect.

[0041] Among them, the waveguide wide side dimension a is 1.37mm≤a≤4mm, the waveguide narrow side dimension b is 0.5mm≤b≤3.6mm, and the offset d of the center line of the waveguide radiation slot 43 is 0.005mm≤d≤1.8mm. Within this range, the overall volume of the serpentine slow-wave slot 22 is small and can take into account higher intensity radiation energy and longer scanning distance, with the best comprehensive performance.

[0042] Exemplarily, the waveguide wide side dimension a is 1.37 mm, 1.50 mm, 1.75 mm, 2.00 mm, 2.25 mm, 2.3 mm, 2.5 mm, 2.75 mm, 3.0 mm, 3.25 mm, 3.75 mm or 4.0 mm, but is not limited thereto.

[0043] Exemplarily, the narrow side dimension b of the waveguide is 0.5 mm, 1.00 mm, 1.50 mm, 2.00 mm, 2.5 mm, 23.0 mm, 3.5 mm or 3.6 mm, but is not limited thereto.

[0044] Exemplarily, the offset d of the center line of the waveguide radiation slot 43 is 0.005mm, 0.008mm, 0.0010mm, 0.015mm, 0.020mm, 0.025mm, 0.030mm, 0.035mm, 0.040mm, 0.045mm, 0.050, 0.055, 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, 0.30 0mm, 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 is not limited to these.

[0045] It should be noted that the wavelength range of the corresponding electromagnetic wave can be obtained according to the working frequency band range of the antenna application. For example, the working frequency range of the W band is: 75~110GHz, and the corresponding wavelength range of the electromagnetic wave is about 2.73~4mm, and the half-wavelength range is: 1.36~2mm, that is, under a certain working frequency, the wavelength of the corresponding electromagnetic wave can be obtained. Among them, the value selected for the waveguide width dimension a is greater than half of the wavelength (i.e. half the wavelength): a>λ / 2, and the waveguide wavelength λ of the waveguide unit can be determined by the waveguide width dimension a and the wavelength λ of the electromagnetic wave. g .like Figure 6 As shown, when the waveguide wide side dimension a, the waveguide narrow side dimension b, the wavelength λ of the electromagnetic wave 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 of the waveguide, that is, the larger the offset d of the center line of the waveguide radiation slot, the larger the equivalent conductance value of the waveguide radiation slot 43, the larger the radiation energy and radiation power, and the longer the radiation or scanning distance.

[0046] Preferably, each connecting waveguide section 42 in the serpentine channel 4 is preferably a 180-degree arc connecting waveguide section, which can correspondingly reduce the voltage standing wave ratio of the serpentine waveguide, and correspondingly increase the antenna gain and reduce the dissipation, thereby improving the stability of the antenna circuit. The shape of the connecting waveguide section 42 is not limited thereto, and can also be a rectangular connecting waveguide section or a semicircular semi-rectangular connecting waveguide section, etc.

[0047] In order to deal with the redundant or excessive electromagnetic wave energy, such as Figures 1 to 2 As shown, the other end of the serpentine slow-wave slot 22 is provided with a signal discharge port 6, which is respectively connected to the serpentine channel 4 and the external discharge end. When electromagnetic waves need to be emitted, the electromagnetic wave signal will flow into the serpentine channel through the feed signal end 3. On the one hand, the electromagnetic wave signal will be coupled to the radiation plate through the waveguide radiation gap 43 of the serpentine channel to radiate the electromagnetic wave signal outward; on the other hand, the redundant or excessive electromagnetic wave energy in the serpentine channel 4 will be discharged outward through the external discharge end through the signal discharge port 6, and received by the corresponding external receiving device to realize electromagnetic wave energy absorption processing.

[0048] Preferably, the waveguide radiation slot 43 is in a strip shape, and both ends of the waveguide radiation slot 43 are semicircular.

[0049] In some embodiments, the length of the straight waveguide segment 41 of the serpentine slow-wave plate is 2 to 25 mm, the width of the straight waveguide segment 41 is 1.37 to 4 mm, the depth of the straight waveguide segment 41 is 0.5 to 3.6 mm, the length of the connecting waveguide segment 42 is 1.6 to 25 mm, and the width of the gap 5 is 0.25 to 1 mm; the length of the waveguide radiation gap 43 is 1.37 to 2.5 mm, the width of the waveguide radiation gap 43 is 0.1 to 0.8 mm, the offset d of the center line of the waveguide radiation gap 43 is 0.005 to 1.8 mm, the length of the waveguide radiation body 1 is 50 to 400 mm, and the width of the waveguide radiation body 1 is 5 to 150 mm. The serpentine slow-wave plate within this range can be better used in the W-band (75-110GHz) working 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] like Figure 5 As shown, Figure 5 The schematic diagram of the structure of the second embodiment of the serpentine slow wave plate of the present invention is shown. Figure 1The difference from the first embodiment shown is that a plurality of the linear waveguide segments 41 may be provided with waveguide radiation slots 43 at intervals. Among the plurality of the linear waveguide segments 41, one waveguide radiation slot 43 is provided in the corresponding linear waveguide segment 41 for each linear waveguide segment 41; the waveguide radiation slots 43 provided in the above-mentioned interval manner can increase the phase difference between two adjacent waveguide radiation slots 43, thereby improving the antenna scanning angle, etc. Accordingly, according to the actual antenna requirements of the user, the number of intervals of the linear waveguide segments 41 can be set, such as providing one waveguide radiation slot 43 for every 2 or 3 linear waveguide segments 41, so as to meet the actual antenna requirements of the user.

[0051] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0052] Example 1

[0053] The present invention provides a serpentine slow-wave plate, comprising a waveguide radiation body 1, a serpentine slow-wave slot 22 is provided on the front end surface of the waveguide radiation body 1, and a feed signal end is provided at one end of the serpentine slow-wave slot 22; a serpentine channel 4 is formed in the serpentine slow-wave slot 22, and the serpentine channel 4 is extended along the length direction of the waveguide radiation body 1, and the serpentine channel 4 is connected to the feed signal end to realize the transmission of electromagnetic waves. The serpentine channel 4 includes a plurality of straight waveguide segments 41 and a connecting waveguide segment 42, and a gap 5 is left between two adjacent straight waveguide segments 41. Two adjacent straight waveguide segments 41 are connected by the connecting waveguide segment 42 to construct a slow-wave line structure, and waveguide radiation slots 43 are respectively provided in the plurality of straight waveguide segments 41. Among them, a straight waveguide segment 41 and a connecting waveguide segment 42 adjacent thereto form a waveguide unit. The center line of the straight waveguide segment 41 is staggered with the center line of the corresponding waveguide radiation slot 43.

[0054] In this embodiment, the length of the straight waveguide section 41 is preferably 9.4 mm, the width of the straight waveguide section 41 (i.e., the waveguide wide side dimension a) is 2.3 mm, the depth of the straight waveguide section 41 (i.e., the waveguide narrow side dimension b) is 1.61 mm, the length of the connecting waveguide section 42 is 4.4 mm, and the width of the gap portion 5 is 0.5 mm; the length of the waveguide radiation gap 43 is 1.9 mm, the width of the waveguide radiation gap 43 is 0.4 mm, the offset d of the center line of the waveguide radiation gap 43 is 0.02-0.10 mm, and the offset d of the center line of multiple waveguide radiation gaps 43 is different. Along the transmission direction of the serpentine channel 4, the offset first increases and then decreases. The length of the waveguide radiation body 1 is 184.8 mm, and the width of the waveguide radiation body 1 is 15 mm.

[0055] In this embodiment, a ratio c of the waveguide narrow side dimension b to the waveguide wide side dimension a is 0.7, and a ratio e of an offset d of a center line of the waveguide radiation slot to the waveguide wide side dimension a is 0.008≤e≤0.043.

[0056] In this embodiment, the operating frequency is 79-80 GHz.

[0057] Example 2

[0058] The present invention provides a serpentine slow-wave plate, comprising a waveguide radiation body 1, a serpentine slow-wave slot 22 is provided on the front end surface of the waveguide radiation body 1, and a feed signal end is provided at one end of the serpentine slow-wave slot 22; a serpentine channel 4 is formed in the serpentine slow-wave slot 22, and the serpentine channel 4 is extended along the length direction of the waveguide radiation body 1, and the serpentine channel 4 is connected to the feed signal end to realize the transmission of electromagnetic waves. The serpentine channel 4 includes a plurality of straight waveguide segments 41 and a connecting waveguide segment 42, and a gap 5 is left between two adjacent straight waveguide segments 41. Two adjacent straight waveguide segments 41 are connected by the connecting waveguide segment 42 to construct a slow-wave line structure, and waveguide radiation slots 43 are respectively provided in the plurality of straight waveguide segments 41. Among them, a straight waveguide segment 41 and a connecting waveguide segment 42 adjacent thereto form a waveguide unit. The center line of the straight waveguide segment 41 is staggered with the center line of the corresponding waveguide radiation slot 43.

[0059] The length of the straight waveguide section 41 is preferably 3 mm, the width of the straight waveguide section 41 (i.e., the waveguide wide side dimension a) is 2.3 mm, the depth of the straight waveguide section 41 (i.e., the waveguide narrow side dimension b) is 1.61 mm, the length of the connecting waveguide section 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 is 0.02-0.10 mm, and the offset d of the center line of the plurality of waveguide radiation slots 43 is different. Along the transmission direction of the serpentine channel 4, the offset increases first and then decreases. 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 section 41 or the connecting waveguide section 42 changes, it will affect the antenna beam scanning pointing angle to a certain extent, and reduce the antenna scanning angle.

[0060] In this embodiment, a ratio c of the waveguide narrow side dimension b to the waveguide wide side dimension a is 0.7, and a ratio e of an offset d of a center line of the waveguide radiation slot to the waveguide wide side dimension a is 0.008≤e≤0.043.

[0061] In this embodiment, the operating frequency is 79-80 GHz.

[0062] Example 3

[0063] The present invention provides a serpentine slow-wave plate, comprising a waveguide radiation body 1, a serpentine slow-wave slot 22 is provided on the front end surface of the waveguide radiation body 1, and a feed signal end is provided at one end of the serpentine slow-wave slot 22; a serpentine channel 4 is formed in the serpentine slow-wave slot 22, and the serpentine channel 4 is extended along the length direction of the waveguide radiation body 1, and the serpentine channel 4 is connected to the feed signal end to realize the transmission of electromagnetic waves. The serpentine channel 4 includes a plurality of straight waveguide segments 41 and a connecting waveguide segment 42, and a gap 5 is left between two adjacent straight waveguide segments 41. Two adjacent straight waveguide segments 41 are connected by the connecting waveguide segment 42 to construct a slow-wave line structure, and waveguide radiation slots 43 are respectively provided in the plurality of straight waveguide segments 41. Among them, a straight waveguide segment 41 and a connecting waveguide segment 42 adjacent thereto form a waveguide unit. The center line of the straight waveguide segment 41 is staggered with the center line of the corresponding waveguide radiation slot 43.

[0064] The length of the straight waveguide section 41 is preferably 9.4 mm, the width of the straight waveguide section 41 (i.e., the waveguide wide side dimension a) is 2.3 mm, the depth of the straight waveguide section 41 (i.e., the waveguide narrow side dimension b) is 1.61 mm, the length of the connecting waveguide section is 4.4 mm, and the width of the gap 5 is 0.5 mm; the length of the waveguide radiation gap 43 is 1.9 mm, the width of the waveguide radiation gap 43 is 0.4 mm, the offset d of the center line of the waveguide radiation gap 43 is 0.07-0.13 mm, and the offset d of the center line of multiple waveguide radiation gaps 43 is different. Along the transmission direction of the serpentine channel 4, the offset first increases and then decreases. 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 radiation body 1 is reduced, in order to retain better antenna gain, sidelobe level and other performance effects, the offset of the center line of the waveguide radiation slot 43 can be adjusted accordingly to adapt to the shorter serpentine slow-wave plate.

[0065] In this embodiment, a ratio c of the waveguide narrow side dimension b to the waveguide wide side dimension a is 0.7, and a ratio e of an offset d of a center line of the waveguide radiation slot to the waveguide wide side dimension a is 0.030≤e≤0.056.

[0066] In this embodiment, the operating frequency is 79-80 GHz.

[0067] Example 4

[0068] The present invention provides a serpentine slow-wave plate, comprising a waveguide radiation body 1, a serpentine slow-wave slot 22 is provided on the front end surface of the waveguide radiation body 1, and a feed signal end is provided at one end of the serpentine slow-wave slot 22; a serpentine channel 4 is formed in the serpentine slow-wave slot 22, and the serpentine channel 4 is extended along the length direction of the waveguide radiation body 1, and the serpentine channel 4 is connected to the feed signal end to realize the transmission of electromagnetic waves. The serpentine channel 4 includes a plurality of straight waveguide segments 41 and a connecting waveguide segment 42, and a gap 5 is left between two adjacent straight waveguide segments 41. Two adjacent straight waveguide segments 41 are connected by the connecting waveguide segment 42 to construct a slow-wave line structure, and waveguide radiation slots 43 are respectively provided in the plurality of straight waveguide segments 41. Among them, a straight waveguide segment 41 and a connecting waveguide segment 42 adjacent thereto form a waveguide unit. The center line of the straight waveguide segment 41 is staggered with the center line of the corresponding waveguide radiation slot 43.

[0069] The length of the straight waveguide section 41 is preferably 8 mm, the width of the straight waveguide section 41 (i.e., the waveguide wide side dimension a) is 1.96 mm, the depth of the straight waveguide section 41 (i.e., the waveguide narrow side dimension b) is 1.37 mm, the length of the connecting waveguide section 42 is 3.74 mm, and the width of the gap portion 5 is 0.425 mm; the length of the waveguide radiation gap 43 is 1.62 mm, the width of the waveguide radiation gap 43 is 0.34 mm, the offset d of the center line of the waveguide radiation gap 43 is 0.017-0.085 mm, and the offset d of the center line of multiple waveguide radiation gaps 43 is different. Along the transmission direction of the serpentine channel 4, the offset first increases and then decreases. 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.

[0070] In this embodiment, a ratio c of the waveguide narrow side dimension b to the waveguide wide side dimension a is 0.7, and a ratio e of an offset d of a center line of the waveguide radiation slot to the waveguide wide side dimension a is 0.008≤e≤0.043.

[0071] In this embodiment, the operating frequency is 92-93 GHz.

[0072] By adjusting the above parameters of the waveguide radiation body in equal proportion, it is possible to adapt to scanning work in different working frequency bands and obtain a better antenna radiation effect.

[0073] Comparative Example 1

[0074] The present invention provides a serpentine slow-wave plate, comprising a waveguide radiation body 1, a serpentine slow-wave slot 22 is provided on the front end surface of the waveguide radiation body 1, and a feed signal end is provided at one end of the serpentine slow-wave slot 22; a serpentine channel 4 is formed in the serpentine slow-wave slot 22, and the serpentine channel 4 is extended along the length direction of the waveguide radiation body 1, and the serpentine channel 4 is connected to the feed signal end to realize the transmission of electromagnetic waves. The serpentine channel 4 includes a plurality of straight waveguide segments 41 and a connecting waveguide segment 42, and a gap 5 is left between two adjacent straight waveguide segments 41. Two adjacent straight waveguide segments 41 are connected by the connecting waveguide segment 42 to construct a slow-wave line structure, and waveguide radiation slots 43 are respectively provided in the plurality of straight waveguide segments 41. Among them, a straight waveguide segment 41 and a connecting waveguide segment 42 adjacent thereto form a waveguide unit. The center line of the straight waveguide segment 41 is staggered with the center line of the corresponding waveguide radiation slot 43.

[0075] In this embodiment, the length of the straight waveguide section 41 is preferably 9.4 mm, the width of the straight waveguide section 41 (i.e., the waveguide wide side dimension a) is 2.3 mm, the depth of the straight waveguide section 41 (the waveguide narrow side dimension b) is 1.61 mm, the length of the connecting waveguide section 42 is 4.4 mm, and the width of the gap 5 is 0.5 mm; the length of the waveguide radiation gap 43 is 1.9 mm, the width of the waveguide radiation gap 43 is 0.4 mm, the offset d of the center line of the waveguide radiation gap 43 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.

[0076] In this embodiment, a ratio c of the waveguide narrow side dimension b to the waveguide wide side dimension a is 0.7, and a ratio e of an offset d of a center line of the waveguide radiation slot to the waveguide wide side dimension a is 0.021.

[0077] In this embodiment, the operating frequency is 79-80 GHz.

[0078] Comparative Example 2

[0079] The present invention provides a serpentine slow-wave plate, comprising a waveguide radiation body 1, a serpentine slow-wave slot 22 is provided on the front end surface of the waveguide radiation body 1, and a feed signal end is provided at one end of the serpentine slow-wave slot 22; a serpentine channel 4 is formed in the serpentine slow-wave slot 22, and the serpentine channel 4 is extended along the length direction of the waveguide radiation body 1, and the serpentine channel 4 is connected to the feed signal end to realize the transmission of electromagnetic waves. The serpentine channel 4 includes a plurality of straight waveguide segments 41 and a connecting waveguide segment 42, and a gap 5 is left between two adjacent straight waveguide segments 41. Two adjacent straight waveguide segments 41 are connected by the connecting waveguide segment 42 to construct a slow-wave line structure, and waveguide radiation slots 43 are respectively provided in the plurality of straight waveguide segments 41. Among them, a straight waveguide segment 41 and a connecting waveguide segment 42 adjacent thereto form a waveguide unit. The center line of the straight waveguide segment 41 coincides with the center line of the corresponding waveguide radiation slot 43.

[0080] In this embodiment, the length of the straight waveguide section 41 is preferably 9.4 mm, the width of the straight waveguide section 41 (i.e., the waveguide wide side dimension a) is 2.3 mm, the depth of the straight waveguide section 41 (i.e., the waveguide narrow side dimension b) is 1.61 mm, the length of the connecting waveguide section 42 is 4.4 mm, and the width of the gap portion 5 is 0.5 mm; the length of the waveguide radiation gap 43 is 1.9 mm, the width of the waveguide radiation gap 43 is 0.4 mm, the offset d of the center line of the waveguide radiation gap 43 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.

[0081] In this embodiment, a ratio c of the waveguide narrow side dimension b to the waveguide wide side dimension a is 0.7, and a ratio e of an offset d of a center line of the waveguide radiation slot to the waveguide wide side dimension a is 0.

[0082] In this embodiment, the operating frequency is 79-80 GHz.

[0083] The performance of the serpentine slow-wave plates prepared in Examples 1 to 4 and Comparative Examples 1 to 2 was tested, and the following results were obtained: Figures 7 to 12 The normalized directivity diagram of the electromagnetic wave shown in the figure has the following test results:

[0084]

[0085] It can be seen from the above test results and the normalized radiation pattern of the electromagnetic wave that, compared with comparative examples 1 to 2, embodiments 1 to 4 have lower sidelobe levels and higher antenna gains, their radiation range and distance are relatively longer, and the electromagnetic wave radiation or scanning effect is better.

[0086] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the field can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A serpentine slow-wave plate, characterized in that: It comprises a waveguide radiation body, a front end surface of which is provided with a serpentine slow-wave groove, and one end of which is provided with a feeding signal end; A serpentine channel is formed in the serpentine slow-wave slot, the serpentine channel is connected to the feeding signal end, the serpentine channel includes a plurality of straight waveguide segments and a connecting waveguide segment, a gap is left between two adjacent straight waveguide segments, and two adjacent straight waveguide segments are connected by the connecting waveguide segment; Waveguide radiation slots are provided at intervals between the plurality of linear waveguide segments or the waveguide radiation slots are provided respectively, and the center line of the linear waveguide segment is staggered with the center line of the corresponding waveguide radiation slot.

2. The serpentine slow-wave plate according to claim 1, characterized in that: The center line of the waveguide radiation slot is horizontally offset to the right or to the left relative to the center line of the straight waveguide section.

3. The serpentine slow-wave plate according to claim 1, characterized in that: The cross-section of the straight waveguide section includes a waveguide wide side dimension a and a waveguide narrow side dimension b. The ratio of the offset d of the center line of the waveguide radiation slot to the waveguide wide side dimension a, e=d / a, is 0<e<0.

5. The equivalent conductance value of the waveguide radiation slot increases with the increase of the ratio e.

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

9.

5. The serpentine slow-wave plate according to claim 4, characterized in that: The wide side dimension a of the waveguide is 1.37 mm ≤ a ≤ 4 mm, the narrow side dimension b of the waveguide is 0.5 mm ≤ b ≤ 3.6 mm, and the offset d of the center line of the waveguide radiation slot is 0.005 mm ≤ d ≤ 1.8 mm.

6. The serpentine slow-wave plate according to claim 1, characterized in that: The serpentine channel is extended along the length direction of the waveguide radiation body.

7. The serpentine slow-wave plate according to 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 according to claim 1, characterized in that: The waveguide radiation slot is in a strip shape.

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

10. The serpentine slow-wave plate according to claim 9, characterized in that: The length of the waveguide radiation body is 50-400 mm, and the width of the waveguide radiation body is 5-150 mm.

Images