Bowknot-shaped LOP waveguide conversion port facilitating processing

Abstract

The utility model discloses a bowknot-shaped LOP waveguide conversion port facilitating processing, which comprises a waveguide conversion port bottom layer and a waveguide conversion port top layer, and the waveguide conversion port top layer is arranged on the upper side of the waveguide conversion port bottom layer. The upper side surface of the waveguide conversion port bottom layer and the lower side surface of the waveguide conversion port top layer are provided with a plurality of rectangular feeder slots which are in one-to-one correspondence up and down, and the lower side surface of the waveguide conversion port bottom layer is provided with a plurality of bowknot-shaped waveguide ports. The plurality of bowknot-shaped waveguide ports are arranged at one end of the rectangular feeder slot in a one-to-one correspondence manner; and a step impedance matching structure is arranged at the joint of the upper end of each bowknot-shaped waveguide port and one end of the rectangular feeder slot. According to the utility model, the impedance matching performance between the double-ridge waveguide port (TI second-generation LoP) and the rectangular port is improved, so that the transmission characteristic of electromagnetic signals is improved.

Description

Technical Field

[0001] This utility model relates to a waveguide conversion port, and more particularly to a bow-shaped LOP waveguide conversion port that is easy to manufacture, belonging to the field of antenna technology. Background Technology

[0002] With the rapid development of automotive millimeter-wave radar, many manufacturers have successively released chip packages that can be directly adapted to waveguide antennas. Among them, the most representative is the second-generation LoP chip released by Texas Instruments (TI). In order to minimize the size occupied by the eight waveguide ports, the second-generation LoP package adopts a double-ridge waveguide port, which brings problems such as impedance matching and mold opening, and the industry urgently needs to come up with corresponding solutions.

[0003] Chinese Patent Publication No. CN222029321U discloses a multi-port input / output waveguide antenna, comprising: a waveguide antenna body and a feed structure; the waveguide antenna body is disposed on the feed structure, and a spatial gap exists between the waveguide antenna body and the feed structure; the waveguide antenna channel includes a slotted antenna array and a waveguide transmission line, and the slotted antenna array is connected to the magnetic conductor bed and the feed structure through the waveguide transmission line. This invention provides a waveguide antenna that matches waveguide RF chips, with antenna port sizes that can match the input / output ports of different waveguide chips. The artificial magnetic conductor bed structure effectively reduces transmission loss. The structure is optimized according to injection molding technology, possessing reliable process feasibility, and features compact size and light weight.

[0004] The waveguide conversion port in this scheme is a rectangular port. Practical verification has shown that the impedance matching performance between the double-ridged waveguide port (TI's second-generation LoP) and the rectangular port is poor, resulting in a low transmission coefficient. This cannot effectively solve the matching problem between the waveguide antenna and the double-ridged waveguide port. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a bow-shaped LOP waveguide conversion port that is easy to process, improves the impedance matching performance between the double-ridged waveguide port and the rectangular port, and improves the electromagnetic signal transmission characteristics.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A bow-shaped LOP waveguide conversion port that is easy to manufacture includes a bottom waveguide conversion port and a top waveguide conversion port. The top waveguide conversion port is located above the bottom waveguide conversion port. The upper side of the bottom waveguide conversion port and the lower side of the top waveguide conversion port have several rectangular feeder slots that correspond one-to-one. The lower side of the bottom waveguide conversion port has several bow-shaped waveguide openings. The bow-shaped waveguide openings are located one-to-one at one end of the rectangular feeder slots, and a stepped impedance matching structure is provided at the connection between the upper end of the bow-shaped waveguide opening and one end of the rectangular feeder slot.

[0008] Furthermore, the number of bow-shaped waveguide ports is eight, and the eight bow-shaped waveguide ports are configured one-to-one with the eight double-ridge waveguide ports of the double-ridge waveguide LOP port.

[0009] Furthermore, the bow-shaped waveguide port has an overall rectangular structure with rounded corners, and the two long sides of the bow-shaped waveguide port form an isosceles triangle at the midpoint, concave towards the center.

[0010] Furthermore, the eight bow-shaped waveguide ports are respectively the first bow-shaped waveguide port, the second bow-shaped waveguide port, the third bow-shaped waveguide port, the fourth bow-shaped waveguide port, the fifth bow-shaped waveguide port, the sixth bow-shaped waveguide port, the seventh bow-shaped waveguide port, and the eighth bow-shaped waveguide port. The first bow-shaped waveguide port, the third bow-shaped waveguide port, the fifth bow-shaped waveguide port, and the seventh bow-shaped waveguide port are arranged in the horizontal direction, while the second bow-shaped waveguide port, the fourth bow-shaped waveguide port, the sixth bow-shaped waveguide port, and the eighth bow-shaped waveguide port are arranged in the vertical direction.

[0011] Furthermore, the length l1 of the first, third, fifth, and seventh bow-shaped waveguide ports is 2.5 mm, and the length l2 of the second, fourth, sixth, and eighth bow-shaped waveguide ports is 2.3 mm.

[0012] Furthermore, the width w at the narrowest point of the center of the first, second, third, fourth, fifth, sixth, seventh, and eighth bow-shaped waveguide ports is 0.85 mm.

[0013] Furthermore, an electromagnetic bandgap structure is provided on the lower side of the bottom layer of the waveguide conversion port.

[0014] Furthermore, the electromagnetic bandgap structure includes multiple polygonal metal pillars, which are distributed on the lower side of the bottom layer of the waveguide conversion port and form several gapped ring structures. These gapped ring structures are arranged one-to-one around the outer perimeter of several bow-shaped waveguide ports.

[0015] Furthermore, the lower side of the top layer of the waveguide conversion port coincides with the step surface with the lowest height in the stepped impedance matching structure of several bow-shaped waveguide ports.

[0016] Compared with the prior art, this utility model has the following advantages and effects: This utility model provides a bow-shaped LOP waveguide conversion port that is conducive to processing, improving the impedance matching performance between the double-ridge waveguide port (TI second-generation LoP) and the rectangular port, thereby improving the electromagnetic signal transmission characteristics; This utility model adopts a bow-shaped waveguide port design, and the narrowest width of the bow-shaped waveguide port is greater than that of the traditional double-ridge waveguide port, thereby increasing the mold structure penetration area at the waveguide port during mold injection molding and extending the service life of the mold; This utility model adopts a bow-shaped waveguide port, and there is no parting surface in the waveguide port channel, which can distribute the mold thickness on both sides more evenly, avoiding the risk of mold breakage caused by an excessively large length-to-diameter ratio on one side of the mold, and increasing the structural strength of the mold. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a bow-shaped LOP waveguide conversion port that is easy to process according to this utility model.

[0018] Figure 2 This is a schematic diagram of the lower side of the bottom layer of the waveguide conversion port of this utility model.

[0019] Figure 3 This is a schematic diagram of the upper side of the bottom layer of the waveguide conversion port of this utility model.

[0020] Figure 4 This is a schematic diagram of the top layer of the waveguide conversion port of this utility model.

[0021] Figure 5 This invention relates to a bow-shaped LOP waveguide conversion port with a reflection coefficient S that is advantageous for manufacturing. 11 curve.

[0022] Figure 6 This invention relates to a bow-shaped LOP waveguide conversion port with a transmission coefficient S that is easy to manufacture. 21 curve. Detailed Implementation

[0023] To elaborate on the technical solutions adopted by this utility model to achieve the intended technical objectives, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Furthermore, the technical means or technical features in the embodiments of this utility model can be replaced without creative effort. The utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 As shown, this utility model discloses a bow-shaped LOP waveguide conversion port that is easy to manufacture. It includes a bottom waveguide conversion port 1 and a top waveguide conversion port 2. The top waveguide conversion port 2 is positioned above the bottom waveguide conversion port 1. Several vertically corresponding rectangular feeder slots 3 are formed on the upper side of the bottom waveguide conversion port 1 and the lower side of the top waveguide conversion port 2. When the top waveguide conversion port 2 is welded and fixed to the top of the bottom waveguide conversion port 1, the corresponding rectangular feeder slots 3 on the upper side of the bottom waveguide conversion port 1 and the lower side of the top waveguide conversion port 2 fit together to form a complete rectangular waveguide feeder. Figure 2 and Figure 3 As shown, several bow-shaped waveguide ports 4 are opened on the lower side of the bottom layer 1 of the waveguide conversion port. The bow-shaped waveguide ports 4 are arranged one-to-one at one end of the rectangular feeder slot 3, and a stepped impedance matching structure 5 is provided at the connection between the upper end of the bow-shaped waveguide port 4 and one end of the rectangular feeder slot 3.

[0025] There are 8 bow-shaped waveguide ports 4, and each of the 8 bow-shaped waveguide ports 4 corresponds to one of the 8 double-ridge waveguide ports LOP ports.

[0026] The bow-shaped waveguide port 4 has a rectangular structure with rounded corners. The two long sides of the bow-shaped waveguide port 4 form an isosceles triangle at the midpoint and are recessed towards the center.

[0027] like Figure 3 As shown, the eight bow-shaped waveguide ports 4 are respectively the first bow-shaped waveguide port 6, the second bow-shaped waveguide port 7, the third bow-shaped waveguide port 8, the fourth bow-shaped waveguide port 9, the fifth bow-shaped waveguide port 10, the sixth bow-shaped waveguide port 11, the seventh bow-shaped waveguide port 12, and the eighth bow-shaped waveguide port 13. Among them, the first bow-shaped waveguide port 6, the third bow-shaped waveguide port 8, the fifth bow-shaped waveguide port 10, and the seventh bow-shaped waveguide port 12 are arranged in the horizontal direction, while the second bow-shaped waveguide port 7, the fourth bow-shaped waveguide port 9, the sixth bow-shaped waveguide port 11, and the eighth bow-shaped waveguide port 13 are arranged in the vertical direction.

[0028] The length l1 of the first bow-shaped waveguide port 6, the third bow-shaped waveguide port 8, the fifth bow-shaped waveguide port 10, and the seventh bow-shaped waveguide port 12 is 2.5 mm, and the length l2 of the second bow-shaped waveguide port 7, the fourth bow-shaped waveguide port 9, the sixth bow-shaped waveguide port 11, and the eighth bow-shaped waveguide port 13 is 2.3 mm.

[0029] The width w at the narrowest point of the center of the first bow-shaped waveguide port 6, the second bow-shaped waveguide port 7, the third bow-shaped waveguide port 8, the fourth bow-shaped waveguide port 9, the fifth bow-shaped waveguide port 10, the sixth bow-shaped waveguide port 11, the seventh bow-shaped waveguide port 12, and the eighth bow-shaped waveguide port 13 is 0.85mm. The narrowest point width at the center of the bow-shaped waveguide port in this invention is 0.85mm, while the narrowest point width at the center of the double-ridge waveguide port in a traditional double-ridge waveguide conversion structure is 0.5-0.6mm. When processing products using injection molding, excessively narrow channels can lead to decreased mold strength, thereby shortening the mold's lifespan. The bow-shaped port can increase the penetration area of ​​the mold, thus extending the mold's lifespan.

[0030] like Figure 2 As shown, an electromagnetic bandgap structure is provided on the lower side of the bottom layer 1 of the waveguide conversion port. The electromagnetic bandgap structure comprises multiple polygonal metal pillars 14, distributed on the lower side of the bottom layer 1 of the waveguide conversion port, forming several gapped ring structures. These gapped ring structures are arranged one-to-one around the outer perimeter of several bow-shaped waveguide ports 4. Due to installation precision issues, after the waveguide conversion port of the antenna is installed on the PCB, the bottom surface of the port cannot be in complete contact with the PCB board; a tiny gap of less than 0.1 mm will exist. The electromagnetic bandgap structure ensures good electromagnetic transmission characteristics.

[0031] The lower side of the top layer 2 of the waveguide conversion port coincides with the lowest step surface among the stepped impedance matching structures of several bow-shaped waveguide ports 4. Stepped impedance matching structures are provided between each of the eight bow-shaped waveguide ports 4 and the rectangular feeder slot 3, and the impedance matching parameters are adjusted by adjusting the height of the step surface. The parting surface of the bottom layer 1 and the top layer 2 of the waveguide conversion port is designed to coincide with the lowest step surface. Thus, in this embodiment, the step surfaces of the fourth bow-shaped waveguide port 9 and the eighth bow-shaped waveguide port 13 coincide with the parting surface, reducing the need to machine two step surface structures during mold design and lowering design costs.

[0032] like Figure 5 and Figure 6As shown, the bow-shaped LOP waveguide conversion port of this invention, which is advantageous for processing, has S11 below -15dB and S21 above -0.4dB in the 74-81GHz frequency band, exhibiting excellent electromagnetic signal transmission characteristics.

[0033] This invention provides a bow-shaped LOP waveguide conversion port that is advantageous for processing, improving the impedance matching performance between the double-ridged waveguide port (TI's second-generation LoP) and the rectangular port, thereby enhancing electromagnetic signal transmission characteristics. The bow-shaped waveguide port design increases the minimum width of the waveguide port compared to the traditional double-ridged waveguide port, thus increasing the mold structure penetration area at the waveguide port during injection molding and extending the mold's service life. Furthermore, the bow-shaped waveguide port eliminates the parting line within the waveguide channel, allowing for a more even distribution of mold thickness on both sides, avoiding the risk of mold breakage due to an excessively large length-to-diameter ratio on one side, and increasing the mold's structural strength.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model's technical solution. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present utility model's technical solution, based on the technical essence of the present utility model and within the spirit and principles of the present utility model, shall still fall within the protection scope of the present utility model's technical solution.

Claims

1. A bow-shaped LOP waveguide conversion port that is easy to manufacture, characterized in that: It includes a bottom waveguide conversion port and a top waveguide conversion port. The top waveguide conversion port is located above the bottom waveguide conversion port. The top surface of the bottom waveguide conversion port and the bottom surface of the top waveguide conversion port have several rectangular feeder slots that correspond one-to-one. The bottom surface of the bottom waveguide conversion port has several bow-tie shaped waveguide openings. The bow-tie shaped waveguide openings are located one-to-one at one end of the rectangular feeder slots, and a stepped impedance matching structure is provided at the connection between the top of the bow-tie shaped waveguide opening and one end of the rectangular feeder slot.

2. The bow-shaped LOP waveguide conversion port that is easy to manufacture according to claim 1, characterized in that: The number of bow-shaped waveguide ports is 8, and the 8 bow-shaped waveguide ports are set one-to-one with the 8 double-ridge waveguide ports of the double-ridge waveguide LOP port.

3. The bow-shaped LOP waveguide conversion port that is easy to manufacture according to claim 2, characterized in that: The bow-shaped waveguide has a rectangular structure with rounded corners. The two long sides of the bow-shaped waveguide form an isosceles triangle at the midpoint, concave towards the center.

4. The bow-shaped LOP waveguide conversion port that is easy to manufacture according to claim 3, characterized in that: The eight bow-shaped waveguide ports are designated as the first bow-shaped waveguide port, the second bow-shaped waveguide port, the third bow-shaped waveguide port, the fourth bow-shaped waveguide port, the fifth bow-shaped waveguide port, the sixth bow-shaped waveguide port, the seventh bow-shaped waveguide port, and the eighth bow-shaped waveguide port. The first, third, fifth, and seventh bow-shaped waveguide ports are arranged laterally, while the second, fourth, sixth, and eighth bow-shaped waveguide ports are arranged longitudinally.

5. The bow-shaped LOP waveguide conversion port that is easy to manufacture according to claim 4, characterized in that: The length l1 of the first, third, fifth, and seventh bow-shaped waveguide ports is 2.5 mm, and the length l2 of the second, fourth, sixth, and eighth bow-shaped waveguide ports is 2.3 mm.

6. The bow-shaped LOP waveguide conversion port that is easy to manufacture according to claim 5, characterized in that: The width w at the narrowest point of the center of the first, second, third, fourth, fifth, sixth, seventh, and eighth bow-shaped waveguide ports is 0.85 mm.

7. The bow-shaped LOP waveguide conversion port that is easy to manufacture according to claim 1, characterized in that: An electromagnetic bandgap structure is provided on the lower side of the bottom layer of the waveguide conversion port.

8. The bow-shaped LOP waveguide conversion port that is easy to manufacture according to claim 7, characterized in that: The electromagnetic bandgap structure comprises multiple polygonal metal pillars distributed on the lower side of the bottom layer of the waveguide conversion port, and the multiple polygonal metal pillars form several gapped ring structures, which are arranged one-to-one around the outer perimeter of several bow-shaped waveguide ports.

9. A bow-shaped LOP waveguide conversion port that is advantageous for manufacturing, as described in claim 1, characterized in that: The lower side of the top layer of the waveguide conversion port coincides with the lowest step surface in the stepped impedance matching structure of several bow-shaped waveguide ports.

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