Conversion structure of E-plane waveguide feeder line and deep groove waveguide feeder line

Abstract

The invention discloses a conversion structure of an E-plane waveguide feeder line and a deep-groove waveguide feeder line, which comprises the E-plane waveguide feeder line, the deep-groove waveguide feeder line and a transition structure, and is characterized in that the E-plane waveguide feeder line and the deep-groove waveguide feeder line are perpendicular to each other; wherein the deep groove waveguide feeder line is higher than the E-plane waveguide feeder line, one end of the E-plane waveguide feeder line and one end of the deep groove waveguide feeder line are partially overlapped to form a transition through hole, and the transition structure is arranged at one end, connected with the E-plane waveguide feeder line, of a spacer of the deep groove waveguide feeder line. The E-plane waveguide feed line is adopted, the characteristic that the middle current is zero is utilized, electromagnetic wave leakage cannot be caused due to separation, electromagnetic waves can be converted to the deep groove waveguide feed line, electromagnetic wave conversion can be achieved without welding, the turning structure of the feed network is placed on the E-plane feed line, and the feed line of the radiation structure is achieved through the deep groove waveguide. And a transition structure between the two feeder lines is designed, so that high-efficiency conversion of the two feeder line modes is realized.

Description

Technical Field

[0001] The present invention relates to a conversion structure, in particular to a conversion structure of an E-plane waveguide feeder and a deep groove waveguide feeder, belonging to the technical field of antennas. Background Art

[0002] The waveguide conversion structure is a transition device used for the efficient transmission of electromagnetic waves between different transmission lines (such as rectangular waveguides, E-plane waveguides, deep-groove waveguides, microstrip lines, etc.). The following core issues need to be addressed: mode matching: the difference in field distribution of the main mode in different waveguides; impedance continuity: the characteristic impedance gradually changes to avoid reflection; broadband characteristics: maintaining low loss within the target frequency band.

[0003] Chinese Patent Publication No. CN206134903U discloses an EH conversion waveguide device, comprising a concave upper and lower waveguides. The semi-open cavity of the upper and lower waveguides forms an E-plane waveguide channel. A waveguide channel connected to the surface waveguide channel is provided within the lower waveguide. E-plane rectangular steps are provided within the lower waveguide and at the intersection of the H-plane waveguide channel and the E-plane waveguide channel. H-plane rectangular step units are provided within the upper waveguide and at the intersection of the H-plane waveguide channel and the E-plane waveguide channel. The upper edge of the rectangular step unit is connected to the top surface of the surface waveguide channel, and the lower edge of the H-plane rectangular step unit is connected to the top surface of the surface waveguide channel. The device of the utility model abandons the traditional surface waveguide to surface waveguide transition structure. By protruding three rectangular steps at the intersection of the two surfaces, the electromagnetic wave steering meets the requirements of bandwidth, electromagnetic compatibility, and signal leakage. The utility model has the characteristics of simple structure, small size, and easy processing.

[0004] This solution has a simple and compact structure, but requires two layers of antenna boards to be welded during processing and manufacturing.

[0005] Chinese Patent Publication No. CN118610743A discloses an E-plane waveguide antenna structure comprising a first structural layer, a second structural layer, and an E-plane waveguide antenna assembly. The first structural layer defines an annular groove, a first waveguide channel, and multiple radiating slots, each of which communicates with the first waveguide channel. The inner wall of the annular groove is provided with multiple cylindrical portions, which are spaced apart to form an electromagnetic bandgap structure. The second structural layer is stacked on the first structural layer and defines a second waveguide channel. The first and second waveguide channels communicate with each other to form a waveguide cavity. The E-plane waveguide antenna assembly is located within the waveguide cavity and has a wide side and a narrow side. Both sides are perpendicular to the extension direction of the E-plane waveguide antenna assembly, and the wide side is greater than or equal to twice the narrow side. This E-plane waveguide antenna structure exhibits excellent signal transmission performance.

[0006] The E-plane waveguide antenna assembly of this solution has a wide side and a narrow side, and the wide side requires two layers of waveguide antenna boards to be welded.

[0007] Chinese Patent Publication No. CN117941173A discloses an open waveguide antenna and a system having the open waveguide antenna, comprising: an electromagnetic (EM) transition portion having a transition region, a signal feeding interface, and an open waveguide section, the EM transition portion being configured to couple EM energy from the signal feeding interface to a guided waveguide mode of EM energy via the transition region to reach the open waveguide section; and a leaky waveguide antenna portion being configured and arranged to radiate electromagnetic energy received from the open waveguide section; wherein the EM transition portion is electromagnetically coupled to the leaky waveguide antenna portion, and the EM transition portion is configured to support electromagnetic energy transfer from the signal feeding structure to the leaky waveguide antenna portion.

[0008] This solution is a deep-groove waveguide antenna. The feed line does not need to be welded, but the turning structure will cause leakage of the antenna. The structure of this solution can reduce the leakage of electromagnetic waves, but it cannot be processed and manufactured.

[0009] In summary, conventional cavity waveguide feeder EH surface impedance transformation structures require two-component soldering (SMT or conductive adhesive), resulting in complex manufacturing processes and low yields. Deep-slot waveguide feeders require only one layer, but the conventional turn structure can lead to electromagnetic wave leakage, affecting transmission efficiency. Conventional cavity power divider structures also occupy a large space. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a conversion structure between an E-plane waveguide feeder and a deep-groove waveguide feeder, thereby solving at least one technical problem of the prior art.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is: A conversion structure between an E-plane waveguide feeder and a deep-groove waveguide feeder comprises an E-plane waveguide feeder, a deep-groove waveguide feeder and a transition structure. The E-plane waveguide feeder and the deep-groove waveguide feeder are arranged perpendicular to each other, wherein the height of the deep-groove waveguide feeder is higher than that of the E-plane waveguide feeder, and one end of the E-plane waveguide feeder partially overlaps with one end of the deep-groove waveguide feeder to form a transition through-hole. The transition structure is arranged at one end of the deep-groove waveguide feeder where a spacer is connected to the E-plane waveguide feeder.

[0012] A conversion structure between an E-plane waveguide feeder and a deep-slot waveguide feeder comprises an E-plane waveguide feeder, a first deep-slot waveguide feeder, and a second deep-slot waveguide feeder. The first deep-slot waveguide feeder and the second deep-slot waveguide feeder are respectively arranged perpendicular to the E-plane waveguide feeder and symmetrically arranged on both sides of the E-plane waveguide feeder. The heights of the first deep-slot waveguide feeder and the second deep-slot waveguide feeder are higher than that of the E-plane waveguide feeder. Both sides of one end of the E-plane waveguide feeder partially overlap with one end of the first deep-slot waveguide feeder and the second deep-slot waveguide feeder to form a transition through hole. A transition structure is arranged at one end where the spacers of the first deep-slot waveguide feeder and the second deep-slot waveguide feeder are connected to the E-plane waveguide feeder.

[0013] A conversion structure for an E-plane waveguide feeder and a deep-groove waveguide feeder comprises an input-end E-plane waveguide feeder, an E-plane power splitter structure, a first E-plane waveguide feeder, a second E-plane waveguide feeder, a third deep-groove waveguide feeder, and a fourth deep-groove waveguide feeder. One end of the input-end E-plane waveguide feeder is connected to the input end of the E-plane power splitter structure. Two output ends of the E-plane power splitter structure are respectively connected to one end of the first E-plane waveguide feeder and one end of the second E-plane waveguide feeder. The first E-plane waveguide feeder and the third deep-groove waveguide feeder are arranged perpendicular to each other, wherein the height of the third deep-groove waveguide feeder is higher than that of the first E-plane waveguide feeder. and one end of the first E-plane waveguide feeder partially overlaps with one end of the third deep slot waveguide feeder to form a transition through hole, a transition structure is provided at an end portion where the spacer of the third deep slot waveguide feeder is connected to the first E-plane waveguide feeder, the second E-plane waveguide feeder and the fourth deep slot waveguide feeder are provided perpendicular to each other, wherein the height of the fourth deep slot waveguide feeder is higher than the height of the second E-plane waveguide feeder, and one end of the second E-plane waveguide feeder partially overlaps with one end of the fourth deep slot waveguide feeder to form a transition through hole, and the transition structure is provided at an end portion where the spacer of the fourth deep slot waveguide feeder is connected to the second E-plane waveguide feeder.

[0014] Furthermore, the E-plane waveguide feeder is equally divided into an upper half of the E-plane waveguide feeder and a lower half of the E-plane waveguide feeder, wherein the lower half of the E-plane waveguide feeder is arranged on the upper side of the first layer board, the upper half of the E-plane waveguide feeder is arranged on the lower side of the second side board, the deep groove waveguide feeder is arranged on the upper side of the second layer board and one end of the deep groove waveguide feeder is connected to one end of the E-plane waveguide feeder through a transition structure and a transition through hole.

[0015] Furthermore, the depth of the groove of the deep groove waveguide feeder is 3.7 mm, the width of the groove of the deep groove waveguide feeder is 2 mm, the height of the spacer of the deep groove waveguide feeder is 1.4 mm, the width of the spacer of the deep groove waveguide feeder is 0.6 mm, the width of the E-plane waveguide feeder is 1.27 mm, and the height of the E-plane waveguide feeder is 2.54 mm.

[0016] Furthermore, the transition structure includes a first-order impedance transformation structure, a second-order impedance transformation structure and a third-order impedance transformation structure. The length of the first-order impedance transformation structure is 1.14 mm, the height of the first-order impedance transformation structure is 0.4 mm, the length of the second-order impedance transformation structure is 0.7 mm, the height of the second-order impedance transformation structure is 0.85 mm, the length of the third-order impedance transformation structure is 0.72 mm, the height of the third-order impedance transformation structure is 1.04 mm, and the width of the first-order impedance transformation structure, the second-order impedance transformation structure and the third-order impedance transformation structure is 0.6 mm.

[0017] Furthermore, the width of the transition through hole is 0.67 mm, and the length of the transition through hole is 2 mm.

[0018] Furthermore, the transition structure includes a first-order impedance transformation structure and a second-order impedance transformation structure, the length of the first-order impedance transformation structure is 1.5 mm, the height of the first-order impedance transformation structure is 0.66 mm, the length of the second-order impedance transformation structure is 1.1 mm, and the height of the second-order impedance transformation structure is 1.1 mm.

[0019] Furthermore, the width of the transition through hole is 0.87 mm, and the length of the transition through hole is 2 mm.

[0020] Furthermore, the transition structure includes a first-order impedance transformation structure, a second-order impedance transformation structure and a third-order impedance transformation structure. The length of the first-order impedance transformation structure is 0.69 mm, the height of the first-order impedance transformation structure is 0.33 mm, the length of the second-order impedance transformation structure is 0.56 mm, the height of the second-order impedance transformation structure is 0.6 mm, the length of the third-order impedance transformation structure is 1.25 mm, the height of the third-order impedance transformation structure is 0.92 mm, and the width of the first-order impedance transformation structure, the second-order impedance transformation structure and the third-order impedance transformation structure is 0.6 mm.

[0021] Furthermore, the width of the transition through hole is 0.67 mm, and the length of the transition through hole is 2 mm.

[0022] Compared with the prior art, the present invention has the following advantages and effects: 1. The present invention adopts E-plane waveguide feeder, taking advantage of the characteristic of zero intermediate current, so that separation will not cause electromagnetic wave leakage. By switching to deep-groove waveguide feeder, electromagnetic wave conversion can be achieved without welding; 2. The present invention places the turning structure of the feed network on the E-plane feeder, and the feeder of the radiating structure is realized by a deep-slot waveguide. Then, a transition structure is designed between the two feeder lines to achieve efficient conversion between the two feeder modes. 3. The present invention integrates the power divider structure with two feeder mode conversion structures, thereby realizing the miniaturization of the power divider structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of embodiment 1 of a conversion structure of an E-plane waveguide feeder and a deep-trench waveguide feeder of the present invention.

[0024] Figure 2 It is a side view of embodiment 1 of a conversion structure of an E-plane waveguide feeder and a deep-slot waveguide feeder of the present invention.

[0025] Figure 3 This is a schematic diagram of S parameters under different gaps in Example 1 of a conversion structure of an E-plane waveguide feeder and a deep-trench waveguide feeder of the present invention.

[0026] Figure 4 It is a schematic diagram of embodiment 2 of a conversion structure of an E-plane waveguide feeder and a deep-trench waveguide feeder of the present invention.

[0027] Figure 5 It is a side view of embodiment 2 of a conversion structure of an E-plane waveguide feeder and a deep-slot waveguide feeder of the present invention.

[0028] Figure 6 This is a schematic diagram of S parameters under different gaps of Example 2 of a conversion structure of an E-plane waveguide feeder and a deep-trench waveguide feeder of the present invention.

[0029] Figure 7 This is a transmission phase diagram of Example 2 of a conversion structure of an E-plane waveguide feeder and a deep-trench waveguide feeder according to the present invention.

[0030] Figure 8 It is a schematic diagram of embodiment 3 of a conversion structure of an E-plane waveguide feeder and a deep-slot waveguide feeder of the present invention.

[0031] Figure 9 It is a side view of embodiment 3 of a conversion structure of an E-plane waveguide feeder and a deep-groove waveguide feeder of the present invention.

[0032] Figure 10 This is a schematic diagram of S parameters under different gaps of Example 3 of a conversion structure of an E-plane waveguide feeder and a deep-trench waveguide feeder of the present invention.

[0033] Figure 11 This is a transmission phase diagram of Example 3 of a conversion structure of an E-plane waveguide feeder and a deep-slot waveguide feeder of the present invention. DETAILED DESCRIPTION

[0034] In order to elaborate on the technical solutions adopted by the present invention to achieve the predetermined technical purpose, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments, and the technical means or technical features in the embodiments of the present invention can be replaced without creative work. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0035] Example 1.

[0036] like Figure 1 and Figure 2 As shown, a conversion structure between an E-plane waveguide feeder and a deep-slot waveguide feeder of the present invention adopts a side-fed structure and includes an E-plane waveguide feeder 3, a deep-slot waveguide feeder 4, and a transition structure. The E-plane waveguide feeder 3 and the deep-slot waveguide feeder 4 are arranged perpendicular to each other, wherein the height of the deep-slot waveguide feeder 4 is higher than that of the E-plane waveguide feeder 3, and one end of the E-plane waveguide feeder 3 partially overlaps with one end of the deep-slot waveguide feeder 4 to form a transition through-hole 5. The transition structure is provided at the end where the spacer 6 of the deep-slot waveguide feeder 4 connects to the E-plane waveguide feeder 3. Here, the height of the deep-slot waveguide feeder 4 and the E-plane waveguide feeder 3 refers to the spatial height of the bottom surfaces of both.

[0037] The E-plane waveguide feeder 3 is equally divided into an upper portion and a lower portion of the E-plane waveguide feeder, wherein the lower portion of the E-plane waveguide feeder is arranged on the upper side of the first layer board 1, and the upper portion of the E-plane waveguide feeder is arranged on the lower side of the second side board 2. The deep groove waveguide feeder 4 is arranged on the upper side of the second layer board 2 and one end of the deep groove waveguide feeder 4 is connected to one end of the E-plane waveguide feeder 3 through a transition structure and a transition through hole 5.

[0038] The slot depth of the deep-slot waveguide feeder 4 is 3.7 mm, the slot width is 2 mm, the spacer height is 1.4 mm, and the spacer width is 0.6 mm. The spacer height of the deep-slot waveguide feeder 4 refers to the distance from the top of the spacer to the bottom of the slot of the deep-slot waveguide feeder 4. The width of the E-plane waveguide feeder 3 is 1.27 mm, and the height of the E-plane waveguide feeder 3 is 2.54 mm.

[0039] The transition structure includes a first-order impedance transformation structure 7, a second-order impedance transformation structure 8, and a third-order impedance transformation structure 9. The length of the first-order impedance transformation structure 7 is 1.14 mm, the height of the first-order impedance transformation structure 7 is 0.4 mm, the length of the second-order impedance transformation structure 8 is 0.7 mm, the height of the second-order impedance transformation structure 8 is 0.85 mm, the length of the third-order impedance transformation structure 9 is 0.72 mm, the height of the third-order impedance transformation structure 9 is 1.04 mm, and the width of the first-order impedance transformation structure 7, the second-order impedance transformation structure 8, and the third-order impedance transformation structure 9 is 0.6 mm. The height of the first-order impedance transformation structure 7, the second-order impedance transformation structure 8, and the third-order impedance transformation structure 9 refers to the height from the top of the impedance transformation structure to the bottom of the deep-slot waveguide feeder 4.

[0040] The width of the transition through hole 5 is 0.67 mm, and the length of the transition through hole 5 is 2 mm.

[0041] The antenna signal is excited and fed into the E-plane waveguide feeder 3 from the other end of the E-plane waveguide feeder 3, and then the antenna signal passes through the transition through hole 5 and the transition structure at the other end of the E-plane waveguide feeder 3 and enters the deep slot waveguide feeder 4. Finally, the antenna signal is excited and output from the other end of the deep slot waveguide feeder 4.

[0042] During processing, the conversion structure of an E-plane waveguide feeder and a deep-groove waveguide feeder of the present invention can be realized by a two-layer structure in the 77 GHz frequency band, and the deep-groove structure only requires a single layer. When the two-layer E-plane feeder is cut in the middle, the current is not cut, so there is very little leakage of electromagnetic waves, and it can be installed by processes such as hot melting and screwing.

[0043] like Figure 3 The figure shows the S parameters of the conversion structure of an E-plane waveguide feeder and a deep-slot waveguide feeder of the present invention at different gaps. The S11 of the waveguide conversion in the three cases is below -15dB in the frequency band of 75-81GHz. The transmission coefficient S21 of a gap of 0.1mm deteriorates by only 0.1dB compared with that of a gap of 0, and the transmission coefficient S21 of a gap of 0.2mm deteriorates by 0.15dB compared with that of a gap of 0. Therefore, the waveguide conversion has high transmission efficiency.

[0044] Example 2.

[0045] like Figure 4 and Figure 5As shown, a conversion structure between an E-plane waveguide feeder and a deep slot waveguide feeder adopts a mid-feed structure and includes an E-plane waveguide feeder 3, a first deep slot waveguide feeder 10, and a second deep slot waveguide feeder 11. The first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11 are respectively arranged perpendicular to the E-plane waveguide feeder 3 and symmetrically arranged on both sides of the E-plane waveguide feeder 3. The heights of the first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11 are higher than the height of the E-plane waveguide feeder 3, and both sides of one end of the E-plane waveguide feeder 3 partially overlap with one end of the first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11 to form a transition through hole 5. The transition structure is arranged at the end where the spacers of the first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11 are connected to the E-plane waveguide feeder 3.

[0046] The E-plane waveguide feeder 3 is equally divided into an upper portion and a lower portion of the E-plane waveguide feeder, wherein the lower portion of the E-plane waveguide feeder is arranged on the upper side of the first layer board 1, and the upper portion of the E-plane waveguide feeder is arranged on the lower side of the second side board 2. The first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11 are arranged on the upper side of the second layer board 2, and one end of the first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11 are connected to one end of the E-plane waveguide feeder 3 through a transition structure and a transition through hole 5.

[0047] The depth of the groove of the first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11 is 3.7 mm, the width of the groove of the first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11 is 2 mm, the height of the spacer of the first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11 is 1.4 mm, and the width of the spacer of the first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11 is 0.6 mm. Here, the height of the spacer of the first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11 refers to the height from the top of the spacer to the bottom of the groove of the first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11. The width of the E-plane waveguide feeder 3 is 1.27 mm, and the height of the E-plane waveguide feeder 3 is 2.54 mm.

[0048] The transition structure includes a first-order impedance transformation structure 7 and a second-order impedance transformation structure 8. The length of the first-order impedance transformation structure 7 is 1.5 mm, the height of the first-order impedance transformation structure 7 is 0.66 mm, the length of the second-order impedance transformation structure 8 is 1.1 mm, and the height of the second-order impedance transformation structure 8 is 1.1 mm.

[0049] The width of the transition through hole 5 is 0.87 mm, and the length of the transition through hole 5 is 2 mm.

[0050] The antenna signal is excited and fed into the E-plane waveguide feeder 3 from the other end of the E-plane waveguide feeder 3, and then the antenna signal passes through the transition through hole 5 and the transition structure at the other end of the E-plane waveguide feeder 3 and enters the first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11. Finally, the antenna signal is excited and output from the other ends of the first deep slot waveguide feeder 10 and the second deep slot waveguide feeder 11 respectively.

[0051] During processing, the conversion structure of an E-plane waveguide feeder and a deep-groove waveguide feeder of the present invention can be realized by a two-layer structure in the 77 GHz frequency band, and the deep-groove structure only requires a single layer. When the two-layer E-plane feeder is cut in the middle, the current is not cut, so there is very little leakage of electromagnetic waves, and it can be installed by processes such as hot melting and screwing.

[0052] like Figure 6 Shown are the S parameters of the conversion structure of an E-plane waveguide feeder and a deep slot waveguide feeder of the present invention at different gaps. The S11 of the waveguide conversion in the three cases is below -15dB in the frequency band of 75-81GHz. The transmission coefficient S21 of a gap of 0.1mm is only deteriorated by 0.1dB compared with the transmission coefficient S21 of a gap of 0.2, and the transmission coefficient S21 of a gap of 0 is deteriorated by 0.15dB. Therefore, the waveguide conversion has efficient transmission. The S11 of the waveguide conversion in the three cases is below -15dB in the frequency band of 75-81GHz, and the transmission coefficient is around -3dB, indicating a good transmission coefficient. The transmission coefficient S21 of a gap of 0.1mm is only deteriorated by 0.1dB compared with the transmission coefficient S21 of a gap of 0.2, and the transmission coefficient S21 of a gap of 0.2 is deteriorated by 0.2dB. Therefore, the waveguide conversion has efficient transmission. Figure 7 As shown, the power divider formed by the conversion structure of an E-plane waveguide feeder and a deep slot waveguide feeder of the present invention has a transmission phase difference of 180°.

[0053] Example 3.

[0054] like Figure 8 and Figure 9As shown, a feed structure having a conversion structure of an E-plane waveguide and a deep slot waveguide includes an input E-plane waveguide feed line 12, an E-plane power divider structure 13, a first E-plane waveguide feed line 14, a second E-plane waveguide feed line 15, a third deep slot waveguide feed line 16, and a fourth deep slot waveguide feed line 17. One end of the input E-plane waveguide feed line 12 is connected to the input end of the E-plane power divider structure 13. The two output ends of the E-plane power divider structure 13 are respectively connected to one end of the first E-plane waveguide feed line 14 and one end of the second E-plane waveguide feed line 15. The first E-plane waveguide feed line 14 and the third deep slot waveguide feed line 16 are arranged perpendicular to each other, wherein the height of the third deep slot waveguide feed line 16 is higher than that of the first E-plane waveguide feed line 14. The height of the feeder line 14 is higher than that of the second E-plane waveguide feeder 15, and one end of the first E-plane waveguide feeder 14 partially overlaps with one end of the third deep slot waveguide feeder 16 to form a transition hole 5. The transition structure is provided at one end where the spacer of the third deep slot waveguide feeder 16 is connected to the first E-plane waveguide feeder 14. The second E-plane waveguide feeder 15 and the fourth deep slot waveguide feeder 17 are provided perpendicular to each other, wherein the height of the fourth deep slot waveguide feeder 17 is higher than that of the second E-plane waveguide feeder 15, and one end of the second E-plane waveguide feeder 15 partially overlaps with one end of the fourth deep slot waveguide feeder 17 to form a transition hole 5. The transition structure is provided at one end where the spacer of the fourth deep slot waveguide feeder 17 is connected to the second E-plane waveguide feeder 15.

[0055] The first E-plane waveguide feeder 14 and the second E-plane waveguide feeder 15 are equally divided into an upper portion and a lower portion of the E-plane waveguide feeder, wherein the lower portion of the E-plane waveguide feeder is arranged on the upper side of the first layer board 1, and the upper portion of the E-plane waveguide feeder is arranged on the lower side of the second side board 2. The third deep slot waveguide feeder 16 and the fourth deep slot waveguide feeder 17 are arranged on the upper side of the second layer board 2, and one end of the third deep slot waveguide feeder 16 and the fourth deep slot waveguide feeder 17 are connected to one end of the first E-plane waveguide feeder 14 and the second E-plane waveguide feeder 15 through a transition structure and a transition through hole 5.

[0056] The depth of the third and fourth deep slot waveguide feeders 16 and 17 is 3.7 mm, the width of the third and fourth deep slot waveguide feeders 16 and 17 is 2 mm, the height of the spacers of the third and fourth deep slot waveguide feeders 16 and 17 is 1.4 mm, and the width of the spacers of the third and fourth deep slot waveguide feeders 16 and 17 is 0.6 mm. The height of the spacers of the third and fourth deep slot waveguide feeders 16 and 17 refers to the height from the top of the spacers to the bottom of the third and fourth deep slot waveguide feeders 16 and 17. The width of the first and second E-plane waveguide feeders 14 and 15 is 1.27 mm, and the height of the first and second E-plane waveguide feeders 14 and 15 is 2.54 mm.

[0057] The transition structure includes a first-order impedance transformation structure 7, a second-order impedance transformation structure 8 and a third-order impedance transformation structure 9. The length of the first-order impedance transformation structure 7 is 0.69 mm, the height of the first-order impedance transformation structure 7 is 0.33 mm, the length of the second-order impedance transformation structure 8 is 0.56 mm, the height of the second-order impedance transformation structure 8 is 0.6 mm, the length of the third-order impedance transformation structure 9 is 1.25 mm, the height of the third-order impedance transformation structure 9 is 0.92 mm, and the width of the first-order impedance transformation structure 7, the second-order impedance transformation structure 8 and the third-order impedance transformation structure 9 is 0.6 mm.

[0058] The width of the transition through hole 5 is 0.67 mm, and the length of the transition through hole 5 is 2 mm.

[0059] The antenna signal is excited and fed into the input E-plane waveguide feeder 12 from the other end of the input E-plane waveguide feeder 12. Then, the antenna signal is divided into two equal streams through the E-plane power divider structure 13 at the other end of the E-plane waveguide feeder 3 and fed into the first E-plane waveguide feeder 14 and the second E-plane waveguide feeder 15 respectively. The signals in the first E-plane waveguide feeder 14 and the second E-plane waveguide feeder 15 pass through the transition through hole 5 and the transition structure and enter the third deep slot waveguide feeder 16 and the fourth deep slot waveguide feeder 17 respectively. Finally, the antenna signal is excited and output from the other ends of the third deep slot waveguide feeder 16 and the fourth deep slot waveguide feeder 17 respectively.

[0060] During processing, the conversion structure of an E-plane waveguide feeder and a deep-groove waveguide feeder of the present invention can be realized by a two-layer structure in the 77 GHz frequency band, and the deep-groove structure only requires a single layer. When the two-layer E-plane feeder is cut in the middle, the current is not cut, so there is very little leakage of electromagnetic waves, and it can be installed by processes such as hot melting and screwing.

[0061] like Figure 10 The figure shows the S parameters of the conversion structure of an E-plane waveguide feeder and a deep slot waveguide feeder of the present invention at different gaps. The S11 of the waveguide conversion in the three cases is below -15dB in the frequency band of 75-81GHz, and the transmission coefficient is around -3dB, indicating a good transmission coefficient. The transmission coefficient S21 of a gap of 0.1mm is only deteriorated by 0.15dB compared to that of a gap of 0, and the transmission coefficient S21 of a gap of 0.2mm is deteriorated by 0.3dB compared to that of a gap of 0.1mm. Therefore, the waveguide conversion has high transmission efficiency. Figure 11 As shown, the power divider formed by the conversion structure of an E-plane waveguide feeder and a deep slot waveguide feeder of the present invention has a transmission phase difference of 180°.

[0062] The present invention adopts an E-plane waveguide feeder, taking advantage of the characteristic of zero intermediate current. Separation does not cause electromagnetic wave leakage, and conversion to a deep-slot waveguide feeder can achieve electromagnetic wave conversion without welding. The present invention places the turning structure of the feeding network on the E-plane feeder, realizes the feeder of the radiation structure through the deep-slot waveguide, and then designs a transition structure between the two feeders to achieve efficient conversion between the two feeder modes. The present invention integrates the power divider structure with the two feeder mode conversion structures to achieve miniaturization of the power divider structure.

[0063] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A conversion structure between an E-plane waveguide feeder and a deep-slot waveguide feeder, characterized by: The invention comprises an E-plane waveguide feeder, a deep slot waveguide feeder and a transition structure. The E-plane waveguide feeder and the deep slot waveguide feeder are arranged perpendicular to each other, wherein the height of the deep slot waveguide feeder is higher than that of the E-plane waveguide feeder, and one end of the E-plane waveguide feeder partially overlaps with one end of the deep slot waveguide feeder to form a transition through hole. The transition structure is arranged at the end where the spacer of the deep slot waveguide feeder is connected to the E-plane waveguide feeder.

2. A conversion structure between an E-plane waveguide feeder and a deep-slot waveguide feeder, characterized by: The invention comprises an E-plane waveguide feeder, a first deep slot waveguide feeder and a second deep slot waveguide feeder, wherein the first deep slot waveguide feeder and the second deep slot waveguide feeder are respectively arranged perpendicular to the E-plane waveguide feeder and symmetrically arranged on both sides of the E-plane waveguide feeder, the heights of the first deep slot waveguide feeder and the second deep slot waveguide feeder are higher than the height of the E-plane waveguide feeder, and both sides of one end of the E-plane waveguide feeder partially overlap with one end of the first deep slot waveguide feeder and the second deep slot waveguide feeder to form a transition through hole, and the transition structure is arranged at one end where the spacers of the first deep slot waveguide feeder and the second deep slot waveguide feeder are connected to the E-plane waveguide feeder.

3. A conversion structure between an E-plane waveguide feeder and a deep-slot waveguide feeder, characterized by: The invention comprises an input E-plane waveguide feeder, an E-plane power divider structure, a first E-plane waveguide feeder, a second E-plane waveguide feeder, a third deep slot waveguide feeder and a fourth deep slot waveguide feeder, wherein one end of the input E-plane waveguide feeder is connected to the input end of the E-plane power divider structure, and the two output ends of the E-plane power divider structure are respectively connected to one end of the first E-plane waveguide feeder and one end of the second E-plane waveguide feeder, and the first E-plane waveguide feeder and the third deep slot waveguide feeder are arranged perpendicular to each other, wherein the height of the third deep slot waveguide feeder is higher than the height of the first E-plane waveguide feeder and the first E-plane waveguide feeder is One end of the feeder partially overlaps with one end of the third deep slot waveguide feeder to form a transition through hole, and the transition structure is provided at an end portion where the spacer of the third deep slot waveguide feeder is connected to the first E-plane waveguide feeder, and the second E-plane waveguide feeder and the fourth deep slot waveguide feeder are arranged perpendicular to each other, wherein the height of the fourth deep slot waveguide feeder is higher than the height of the second E-plane waveguide feeder and one end of the second E-plane waveguide feeder partially overlaps with one end of the fourth deep slot waveguide feeder to form a transition through hole, and the transition structure is provided at an end portion where the spacer of the fourth deep slot waveguide feeder is connected to the second E-plane waveguide feeder.

4. The E-plane waveguide and deep-trench waveguide conversion structure according to claim 1, 2 or 3, characterized in that: The E-plane waveguide feeder is divided into an upper portion and a lower portion of the E-plane waveguide feeder, wherein the lower portion of the E-plane waveguide feeder is arranged on the upper side of the first layer board, the upper portion of the E-plane waveguide feeder is arranged on the lower side of the second side board, and the deep groove waveguide feeder is arranged on the upper side of the second layer board, and one end of the deep groove waveguide feeder is connected to one end of the E-plane waveguide feeder through a transition structure and a transition through hole.

5. The E-plane waveguide and deep-trench waveguide conversion structure according to claim 1, 2 or 3, characterized in that: The depth of the groove of the deep groove waveguide feeder is 3.7 mm, the width of the groove of the deep groove waveguide feeder is 2 mm, the height of the spacer of the deep groove waveguide feeder is 1.4 mm, the width of the spacer of the deep groove waveguide feeder is 0.6 mm, the width of the E-plane waveguide feeder is 1.27 mm, and the height of the E-plane waveguide feeder is 2.54 mm.

6. The E-plane waveguide and deep-trench waveguide conversion structure according to claim 1, wherein: The transition structure includes a first-order impedance transformation structure, a second-order impedance transformation structure, and a third-order impedance transformation structure. The length of the first-order impedance transformation structure is 1.14 mm, the height of the first-order impedance transformation structure is 0.4 mm, the length of the second-order impedance transformation structure is 0.7 mm, the height of the second-order impedance transformation structure is 0.85 mm, the length of the third-order impedance transformation structure is 0.72 mm, the height of the third-order impedance transformation structure is 1.04 mm, and the width of the first-order impedance transformation structure, the second-order impedance transformation structure, and the third-order impedance transformation structure is 0.6 mm.

7. The E-plane waveguide and deep-trench waveguide conversion structure according to claim 1, wherein: The width of the transition through hole is 0.67 mm, and the length of the transition through hole is 2 mm.

8. The E-plane waveguide and deep-trench waveguide conversion structure according to claim 2, wherein: The transition structure includes a first-order impedance transformation structure and a second-order impedance transformation structure. The length of the first-order impedance transformation structure is 1.5 mm, the height of the first-order impedance transformation structure is 0.66 mm, the length of the second-order impedance transformation structure is 1.1 mm, and the height of the second-order impedance transformation structure is 1.1 mm.

9. The E-plane waveguide and deep-trench waveguide conversion structure according to claim 2, wherein: The width of the transition through hole is 0.87 mm, and the length of the transition through hole is 2 mm.

10. The E-plane waveguide and deep-trench waveguide conversion structure according to claim 3, characterized in that: The transition structure includes a first-order impedance transformation structure, a second-order impedance transformation structure and a third-order impedance transformation structure. The length of the first-order impedance transformation structure is 0.69 mm, the height of the first-order impedance transformation structure is 0.33 mm, the length of the second-order impedance transformation structure is 0.56 mm, the height of the second-order impedance transformation structure is 0.6 mm, the length of the third-order impedance transformation structure is 1.25 mm, the height of the third-order impedance transformation structure is 0.92 mm, and the width of the first-order impedance transformation structure, the second-order impedance transformation structure and the third-order impedance transformation structure is 0.6 mm.

11. The E-plane waveguide and deep-trench waveguide conversion structure according to claim 3, wherein: The width of the transition through hole is 0.67 mm, and the length of the transition through hole is 2 mm.

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