A high temperature resistant wide bandwidth circularly polarized antenna and its application

Abstract

The present invention discloses a high-temperature resistant, wide-bandwidth, circularly polarized antenna and its application, which belongs to the field of aircraft data link system communication antennas, and includes a mounting cavity with a first opening and an antenna box with a second opening, wherein the antenna box is embedded in the first opening; a feed connector, wherein the feed connector is disposed in the second opening, and an antenna radiation plate is disposed at the second opening; a feed cable assembly, wherein the feed cable assembly is embedded in the mounting cavity, wherein a first through hole is provided on the mounting cavity, and a second through hole is provided on the antenna box, wherein the plug of the feed cable assembly is embedded in the first through hole, the socket of the feed connector is embedded in the second through hole, and the plug of the feed cable assembly is correspondingly inserted into the socket of the feed connector. The high-temperature resistant, wide-bandwidth, circularly polarized antenna in this application can withstand an external conductive high-temperature thermal environment of up to 450°C and has good antenna electrical performance. It has good data communication performance in actual flight tests.

Description

Technical Field

[0001] The present invention belongs to the field of communication antennas for aircraft data link systems, and in particular relates to a high-temperature resistant, wide-bandwidth beam circularly polarized antenna and its application. Background Art

[0002] With the rapid development of wireless communication systems and aircraft communications, aircraft data link systems have put forward more and more demands and high requirements on the antenna performance of data link system communications such as ground-to-ground and satellite-to-satellite communications based on actual usage requirements.

[0003] Aircraft typically fly at high speeds, with large variations in angles between communication targets. To ensure data communication capacity and reliable reception, and considering the complex communication environment, circularly polarized antennas with wide operating frequency bandwidth, high low-elevation gain, wide axial ratio beamwidth, and high axial gain are required. Furthermore, due to the limitations of the carrier installation environment, most existing sunken aircraft data link communication antennas use microstrip patch antennas. Microstrip antennas are prone to deformation at temperatures above 200°C, causing changes in the antenna structure, which can severely impact antenna performance and, consequently, data communication quality. Therefore, to adapt to the harsh carrier installation environment, the antenna needs to be heat-resistant. Summary of the Invention

[0004] In response to one or more of the above-mentioned defects or improvement needs in the prior art, the present invention provides a high-temperature resistant wide-bandwidth beam circularly polarized antenna to solve the problem that the existing circularly polarized antenna is prone to signal interference.

[0005] To achieve the above objectives, the present invention provides a high-temperature resistant, wide-bandwidth circularly polarized antenna, comprising:

[0006] a mounting cavity having a first opening;

[0007] an antenna box body, the antenna box body being embedded in the first opening and having a second opening at an end of the antenna box body facing away from the first opening;

[0008] A feeding connector is provided in the second opening, and an antenna radiating plate is provided at the second opening, and the antenna radiating plate and the antenna box body encapsulate the feeding connector accordingly;

[0009] A radome, which is provided on the first opening and correspondingly encapsulates the antenna radiation plate, the feed connector and the antenna box;

[0010] a feeder cable assembly, the feeder cable assembly being embedded in the mounting cavity and disposed at an end facing away from the first opening;

[0011] The mounting cavity and the antenna box body are respectively provided with a first through hole and a second through hole passing through the two correspondingly;

[0012] The plug of the feed cable assembly is embedded in the first through hole, and the socket of the feed connector is embedded in the second through hole. The plug of the feed cable assembly is correspondingly plugged into the socket of the feed connector to stimulate and feed the feed connector.

[0013] As a further improvement of the present invention, the antenna radiation plate is provided with a radiation patch and a feed coupling line at one end facing the antenna cover;

[0014] A first ground plate is provided at one end of the antenna radiation plate facing the feeding connector;

[0015] A third through hole is provided on the antenna radiation plate, and a probe is provided on one end of the feed connector facing the radiation patch. The probe passes through the third through hole and is connected to the radiation patch with solder.

[0016] As a further improvement of the present invention, a metallized feeding probe via hole is provided on the first ground plate corresponding to the third through hole, and a clearance ring is provided at the metallized feeding probe via hole, and the clearance ring isolates the first ground plate from the probe.

[0017] As a further improvement of the present invention, the radiation patch is arranged in a square shape, and two cut corners are formed at two diagonal portions of the radiation patch;

[0018] A first strip-shaped notch is opened on one side of the radiation patch, the feed coupling line is correspondingly arranged at the opening of the first strip-shaped notch, and a semicircular cutout is opened on the side opposite to the strip-shaped notch;

[0019] The radiation patch is provided with second strip notches on the other two sides corresponding to the semicircular cutout and the first strip notch;

[0020] The ultra-wideband impedance matching and wide-beam radiation of the high-temperature resistant wide-bandwidth circularly polarized antenna are adjusted by the sizes of the first strip notch, the semicircular cutout, and the second strip notch.

[0021] As a further improvement of the present invention, the antenna box body is provided with a second grounding plate at one end facing the antenna radiation plate, and a third grounding plate at one end facing away from the antenna radiation plate.

[0022] As a further improvement of the present invention, the antenna box body is disc-shaped, and the antenna box body is respectively provided with a first passing hole, a second passing hole and a third passing hole at different inner diameter sizes, and a fourth passing hole is correspondingly opened at the center of the antenna box body;

[0023] The first passing hole, the second passing hole and the third passing hole are respectively evenly distributed along the circumference of the antenna box body;

[0024] The wide beam radiation of the high temperature resistant wide bandwidth circularly polarized antenna is adjusted by the size, number and arrangement interval of the first via hole, the second via hole, the third via hole and the fourth via hole.

[0025] As a further improvement of the present invention, the second grounding plate and the third grounding plate are attached to the two end surfaces of the antenna box body, and the second grounding plate and the third grounding plate are respectively provided with the first metal via, the second metal via, the third metal via and the fourth metal via corresponding to the first via hole, the second via hole, the third via hole and the fourth via hole.

[0026] As a further improvement of the present invention, a plurality of first protruding columns are evenly distributed along the circumference on the side of the antenna cover facing the installation cavity, and the first protruding columns are arranged corresponding to the first passing holes. The first protruding columns pass through the antenna radiation plate and the antenna box body and abut against the inner wall of the first opening.

[0027] As a further improvement of the present invention, an air layer is provided at one end of the antenna cover facing the antenna radiation plate, and the air layer is correspondingly sealed in a closed space formed by the antenna cover and the installation cavity.

[0028] The present application also includes an application of a high temperature resistant wide bandwidth beam circularly polarized antenna in the X / Ku band.

[0029] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0030] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0031] (1) The high-temperature resistant, wide-bandwidth, circularly polarized antenna of the present invention has a relatively small overall size and can adapt to different installation carrier environments by changing the external dimensions of the installation cavity, which is beneficial for subsequent improved designs of antennas for different usage requirements and has good versatility.

[0032] (2) The high-temperature resistant, wide-bandwidth, circularly polarized antenna of the present invention has an antenna cover and an antenna box body made of plastic, and the antenna radiation plate is entirely wrapped in the antenna cover and the antenna box body, thereby minimizing direct contact between the antenna radiation plate and the metal mounting cavity, and can effectively block high-temperature heat conducted from the antenna mounting carrier due to environmental factors, and has high-temperature resistance.

[0033] (3) The high-temperature resistant wide-bandwidth circularly polarized antenna of the present invention couples the radiating patch through a feeding coupling line, opens a hemispherical notch of the same size at a symmetrical position of the radiating patch relative to the feeding point, and opens a gap of a certain size on the other two sides of the radiating patch, which can effectively improve the uniform distribution of the current on the surface of the radiating patch, realize ultra-wideband impedance matching design, and realize wide-beam radiation and make the antenna gain pattern as a whole circular.

[0034] (4) The high-temperature resistant, wide-bandwidth, circularly polarized antenna of the present invention has ground planes added to the front and back sides of the antenna box, and a series of metallized vias are used to connect the front and back ground planes. This structure can avoid the formation of a resonant cavity in the antenna box, and at the same time increase the thickness of the radiation ground plane in the antenna radiation plate, thereby further widening the beam.

[0035] (5) The antenna radiation plate of the high-temperature resistant wide-bandwidth circularly polarized antenna of the present invention is connected to the boss of the antenna box body through symmetrically distributed metal vias, which couple to electromagnetic energy from the radiation patch and radiate it out, which can further widen the beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 2 is a schematic diagram of the back structure of a high-temperature resistant, wide-bandwidth beam circularly polarized antenna according to an embodiment of the present invention;

[0037] Figure 2 1 is a schematic diagram of the front structure of a high-temperature resistant, wide-bandwidth beam circularly polarized antenna according to an embodiment of the present invention;

[0038] Figure 3 1 is an exploded diagram of a high-temperature resistant, wide-bandwidth beam circularly polarized antenna according to an embodiment of the present invention;

[0039] Figure 4 1 is an exploded diagram of a high-temperature resistant, wide-bandwidth beam circularly polarized antenna according to an embodiment of the present invention;

[0040] Figure 5 is a structural schematic diagram of an antenna box body in an embodiment of the present invention;

[0041] Figure 6 1 is a schematic cross-sectional view of a high-temperature resistant, wide-bandwidth, circularly polarized antenna according to an embodiment of the present invention;

[0042] Figure 7 1 is a schematic diagram of the front structure of the antenna radiation plate in an embodiment of the present invention;

[0043] Figure 8 is a structural diagram of the first grounding plate in an embodiment of the present invention;

[0044] Figure 9 is a structural diagram of the second grounding plate in an embodiment of the present invention;

[0045] Figure 10 is a structural diagram of the third grounding plate in an embodiment of the present invention;

[0046] Figure 11 Schematic diagram of antenna standing waves that can be achieved by the antenna in an embodiment of the present invention;

[0047] Figure 12 Schematic diagram of gain patterns of two different cross sections at the center frequency of a circularly polarized antenna according to an embodiment of the present invention;

[0048] Figure 13 Schematic diagram of the axial ratio radiation pattern of two different cross sections at the center frequency point of the circularly polarized antenna in an embodiment of the present invention.

[0049] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0050] 1. Mounting cavity; 2. First opening; 3. Antenna box body; 4. Second opening; 5. Feed connector; 6. Antenna radiating plate; 7. Feed cable assembly; 8. Antenna cover; 9. First through hole; 10. Second through hole; 11. Plug; 12. Socket; 13. Radiating patch; 14. Feed coupling line; 15. Third through hole; 16. Probe; 17. First ground plate; 18. Second ground plate; 19. Third ground plate; 20. Metallized feed probe via; 21. Clearance ring; 22. First via hole; 23. Second via hole; 24. Third via hole; 25. Fourth via hole; 26. First raised column; 27. First metal via; 28. Second metal via; 29. ​​Third metal via; 30. Fourth metal via. DETAILED DESCRIPTION

[0051] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0054] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0055] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0056] Example:

[0057] See also Figures 1 to 13The high temperature resistant wide bandwidth circularly polarized antenna in the preferred embodiment of the present invention comprises: a mounting cavity 1 having a first opening 2; an antenna box body 3, which is embedded in the first opening 2 and provided with a second opening 4 at one end of the antenna box body 3 away from the first opening 2, wherein the first opening 2 and the second opening 4 are opened in the same direction; a feed connector 5, which is provided in the second opening 4 and an antenna radiation plate 6 is provided at the second opening 4, wherein the antenna radiation plate 6 and the antenna box body 3 seal the feed connector 5 accordingly. The antenna box body 3 is provided with a second through hole 10. The plug 11 of the feed cable assembly 7 is embedded in the first through hole 9, and the socket 12 of the feed connector 5 is embedded in the second through hole 10. The plug 11 of the feed cable assembly 7 is correspondingly inserted into the socket 12 of the feed connector 5, and the feed connector 5 is excited and fed through the feed cable assembly 7.

[0058] Specifically, the antenna radiating plate 6 in this application is provided with a radiating patch 13 and a feed coupling line 14 on the end facing the radome 8. A first ground plane 17 is provided on the end facing the feed connector 5. A third through hole 15 is correspondingly provided on the antenna radiating plate 6. A probe 16 is provided on the end facing the radiating patch 13, which passes through the third through hole 15 and is soldered to the radiating patch 13. The feed coupling line 14 is primarily used for coupling and feeding between the probe 16 and the radiating patch 13. Preferably, the radiating patch 13 is fabricated using photolithography techniques.

[0059] Preferably, the second through hole 10 in the present application is a circular hole as a whole, and the socket 12 of the feeding connector 5 is arranged in a square shape. The diagonal diameter of the socket 12 of the feeding connector 5 is smaller than the inner diameter of the second through hole 10, so that the feeding connector 5 can be inserted into the second through hole 10.

[0060] The antenna cover 8 and antenna housing 3 in this application are both made of plastic, preferably polyimide, which has good high-temperature resistance, reaching temperatures above 400°C, making it suitable for high-temperature environments. By replacing the antenna housing 3 with plastic, this application has lower heat transfer than metal, minimizing the temperature of the radiating patch 13 and feed connector 5 caused by heat conduction.

[0061] Furthermore, since the antenna box body 3 is made of plastic, in order to ensure the good grounding conduction performance of the high-temperature resistant wide-bandwidth beam circularly polarized antenna itself, a plurality of metallized vias are opened on the antenna box body 3, and the antenna box body 3 is connected to the metal mounting cavity 1 through the metallized vias to complete the grounding work.

[0062] In addition, a first grounding plate 17 is provided at one end of the antenna radiating plate 6 facing the feeding connector 5, and the first grounding plate 17 is used for grounding conduction. A second grounding plate 18 is also provided at the end of the antenna box body 3 facing the antenna radiating plate 6, and a third grounding plate 19 is provided at the end away from the antenna radiating plate 6. The functions of the second grounding plate 18 and the third grounding plate 19 are the same as those of the first radiating plate, and are mainly used to realize the grounding of the entire circularly polarized antenna.

[0063] Furthermore, as a preferred embodiment of the present invention, a metallized feed probe via 20 is provided on the first grounding plate 17 in the present application at a position corresponding to the third through hole 15, and a clearance ring 21 is provided at the metallized feed probe via 20. The clearance ring 21 is used to isolate the first grounding plate 17 from the probe 16. When the first grounding plate 17 is used to complete the grounding work, since the probe 16 on the feed connector needs to pass through the corresponding third through hole 15, a corresponding metallized feed probe via 20 needs to be provided on the first grounding plate 17 to allow the probe 16 to pass through. At the same time, in order to prevent the probe 16 on the feed connector 5 from contacting the first radiating plate and causing signal crosstalk problems, a clearance ring 21 is provided at the metallized feed probe via 20. The clearance ring 21 isolates the first grounding plate 17 from the probe 16, thereby achieving an isolation effect.

[0064] Furthermore, the wide beam radiation of the high temperature resistant wide bandwidth circularly polarized antenna in the present application is adjusted by the arrangement of the radiation patch 13 and each ground plane.

[0065] Specifically, the radiating patch 13 in the present application is generally square in shape, with two cut corners formed at two opposite corners of the radiating patch 13. A first strip-shaped notch is provided on one side of the radiating patch 13, and the feed coupling line 14 is correspondingly provided at the opening of the first strip-shaped notch. A semicircular notch is provided on the opposite side of the radiating patch 13. Furthermore, a second strip-shaped notch is provided on both sides of the radiating patch 13 corresponding to the semicircular notch and the feed coupling line 14. The antenna in the present application excites and feeds the feed coupling line 14 via the feed cable assembly 7 and the feed connector 5. The feed coupling line 14 then couples and excites the radiating patch 13 through the gap at the first strip-shaped notch, ultimately radiating the excitation signal as a circularly polarized electromagnetic wave.

[0066] Furthermore, the antenna housing 3 is disc-shaped, with a first through hole 22, a second through hole 23, and a third through hole 24 provided at different inner diameters, and a fourth through hole 25 provided at the center of the antenna housing 3. Furthermore, the first through hole 22, the second through hole 23, and the third through hole 24 are evenly distributed along the circumference of the antenna housing 3. Preferably, the second grounding plate 18 and the third grounding plate 19 are provided with a first metal via 27, a second metal via 28, a third metal via 29, and a fourth metal via 30, respectively, corresponding to the first through hole 22, the second through hole 23, the third through hole 24, and the fourth through hole 25 on the antenna housing 3.

[0067] Furthermore, a clearance hole is provided at the same diameter as the first through hole 22 corresponding to the first raised column 26 of the antenna radiating plate 6 in the present application. The clearance hole is mainly used for the corresponding fixation of the antenna radiating plate 6, the antenna cover 8 and the antenna box body 3. The corresponding arrangement of the through holes and the metal vias can form multiple straight-through grounding holes, through which electromagnetic energy can be coupled to and radiated from the radiating patch 13, thereby enhancing the main radiation energy of the radiating patch 13. In addition, since the grounding holes are symmetrically distributed, a wide-beam radiation design can be achieved by correspondingly changing the inner diameter and number of the first through holes 22.

[0068] More specifically, the overall length and width of the radiation patch 13 are L1 and L2, L1 is preferably 6.2-6.3 mm, and L2 is preferably 7.5-7.9 mm; the gap width at the first strip notch corresponding to the feed coupling line 14 is L3, and L3 is preferably 0.08-0.12 mm; the length and width of the cut portion at the two cut corners are L4 and L5, and the preferred range of L4 and L5 is 2.1-2.2 mm; the depth of the second strip notch corresponding to the two sides of the radiation patch 13 relative to the semicircular notch and the feed coupling line 14 is L6, and the gap is L7. The gap width is L7, L6 is preferably 1.4-1.6mm, and L7 is preferably 0.18-0.22mm. The radius of the semicircular cutout opposite the first strip notch is R2, which is preferably 0.5-0.7mm. The radius of the notch where the radiating patch 13 is placed, where the feed coupling line 14 is placed, is R3. The feed coupling line 14 itself is arranged in a circular shape, with a central feed aperture of R4, which is preferably 0.18-0.22mm. The depth of the feed coupling line 14 extending into the first strip notch is L8, which is preferably 2.3-2.7mm. The optimal setting of these parameters allows for optimized design of the operating frequency band, bandwidth, beam, etc.

[0069] Further preferably, in this application, the antenna radiating plate 6 is preferably made of a material with a dielectric constant of 2.2, the radome 8 is preferably made of a material with a dielectric constant of 3.5, and the antenna housing 3 is preferably made of a material with a dielectric constant of 3.5. The antenna radiating plate 6 preferably has a thickness H1 of 1.8 to 2.2 mm and is disc-shaped, with an outer radius R5 of 11 to 13 mm. The radome 8 is surrounded by first raised studs 26. These first studs 26 can be spirally attached directly to the radome 8 to secure it to the antenna housing 3 and the antenna radiating plate 6. Alternatively, the first studs 26 themselves can be screws, directly securing the radome 8, the antenna housing 3, and the antenna radiating plate 6. The number of first studs 26 is preferably four, and the outer diameter of these studs is preferably 0.9 to 1.1 mm. Preferably, the overall thickness of the antenna box body 3 is H2, which is preferably 3.8-4.2 mm. The depth of the second opening 4 in the antenna box body 3 is H3, which is preferably 1.8-2.2 mm. The antenna box body 3 is disc-shaped as a whole, and its outer radius R11 is preferably 17-18 mm.

[0070] Preferably, the second grounding plate 18 is also a disc-shaped structure, and its outer radius R10 is preferably 11 to 13 mm. The second grounding plate 18 is provided with a clearance hole corresponding to the first raised column 26; the radius R6 of the first passing hole is preferably 0.9 to 1.1 mm; the radius of the second passing hole 23 is R7, which is preferably 1.4 to 1.6 mm, and the angle α between the two adjacent second passing holes 23 and the center of the circle is preferably 15°, and the number of second passing holes 23 is preferably 24; the radius of the third passing hole 24 is R8, which is preferably 0.9 to 1.1 mm, and the angle β between the two adjacent third passing holes 24 is preferably 15°, and the number of third passing holes 24 is preferably 24; a center passing hole is set in the center of the second grounding plate 18, and the radius R9 of the center passing hole is preferably 1.4 to 1.6 mm, and the distance L10 between the center of the third passing hole 24 and the center of the center passing hole is preferably 8.4 to 8.6 mm.

[0071] Further preferably, the feed coupling line 14 , the radiation patch 13 , the first ground plate 17 , the second ground plate 18 and the third ground plate 19 in the present application are all made of copper-plated material, and the thickness thereof is generally the marked value 0.018 mm.

[0072] Furthermore, as a preferred embodiment of the present invention, an air layer is provided at one end of the antenna cover 8 facing the antenna radiation plate 6 in the present application, and the air layer is correspondingly sealed in the enclosed space formed by the antenna cover 8 and the installation cavity 1. Specifically, the end of the antenna cover 8 facing the antenna radiation plate 6 is correspondingly concave to form a cavity space. Since the end of the antenna radiation plate 6 facing the antenna cover 8 is provided with a radiation patch 13 and a feed coupling line 14, and the probe 16 of the feed connector 5 is connected to the radiation patch 13 by soldering, a solder joint will be formed on the surface of the radiation patch 13 during the soldering connection, and will protrude from the surface of the radiation patch 13. In order to ensure the installation matching of the various structural components of the circularly polarized antenna, an air layer is correspondingly formed on the antenna cover 8 to facilitate the installation of the radiation patch 13. At the same time, since the antenna cover 8 is the last layer of structure that contacts the radiation patch 13 with the outside world, the high thickness of the antenna cover 8 itself will hinder the transmission of the beam generated by the radiation patch 13. Therefore, by setting the antenna cover 8 to a concave form, the obstruction between the radiation patch 13 and the external environment is reduced, thereby improving the ability to transmit the beam outward.

[0073] Furthermore, the high temperature resistant wide bandwidth circularly polarized antenna in the present application preferably operates in the X / Ku band. Specifically, the above parameters are optimized and tested below.

[0074] Example: L1 of the radiating patch 13 is 6.25mm, L2 is 7.7mm, and the gap width at the first strip notch is 0.1mm. The length and width L4 and L5 at the two cut corners are both 2.15mm. The depth L6 of the second strip notch is 1.5mm, and the width L7 is 0.2mm. The radius R2 of the semicircular notch opposite the first strip notch is 0.6mm. The central feed aperture R4 of the feed coupling line 14 is 0.2mm, and the depth L8 where the feed coupling line 14 extends into the first strip notch is 2.5mm. The thickness H1 of the antenna radiating plate 6 is 2mm, the outer radius R5 is 12mm, and the outer diameter of the first protrusion 26 is 1mm. The overall thickness H2 of the antenna box body 3 is 4 mm, the depth H3 at the second opening 4 is 2 mm, and the outer radius R11 of the antenna box body 3 is 17.5 mm; the outer radius R10 of the second ground plate 18 is 12 mm, the R6 of the first through hole 22 is 1 mm, the R7 of the second through hole 23 is 1.5 mm, the R8 of the third through hole 24 is 1 mm, the center through hole R9 is 1.5 mm, and the distance L10 between the center of the third through hole 24 and the center of the center through hole is 8.5 mm.

[0075] By testing the standing wave of the high temperature resistant wide bandwidth beam circularly polarized antenna in this embodiment, the standing wave bandwidth thereof reaches more than 24% when the standing wave is less than 2, thus realizing the bandwidth design. Figure 11As shown. In addition, the gain pattern of the two interfaces at the center frequency point Phi = 0° (E plane) and Phi = 90° (H plane) shows that the gain of Theta is greater than +2.3dBi in the range of ±60°, the gain of Theta is greater than -1dBi in the range of ±75°, the maximum gain is greater than 6dBi, and the overall pattern is relatively symmetrical, realizing the design of a wide beam, as shown Figure 12 As shown, Figure 12 The solid line is the H-plane gain pattern at the center frequency, and the dotted line is the E-plane gain pattern at the center frequency. Furthermore, the standing wave value of the circularly polarized antenna in the 10.931-13.959 GHz band is less than 2, making it suitable for the X / Ku band. At the same time, the axial ratio pattern of the device at the center frequency Phi = 0° (E-plane) and Phi = 90° (H-plane) shows that the axial ratio of Theta is less than 3dB within the range of ±65°, achieving a good circular polarization design. Figure 13 As shown, Figure 13 The solid line is the H-plane axial ratio pattern at the center frequency, and the dashed line is the E-plane axial ratio pattern at the center frequency. Furthermore, the electrical performance of the high-temperature-resistant, wide-bandwidth, circularly polarized antenna designed in this application was simulated in a missile-borne simulation environment. It can withstand an external conductive high-temperature environment of up to 450°C while maintaining good antenna electrical performance. It also exhibited good data communication performance in actual flight tests.

[0076] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high temperature resistant wide bandwidth circularly polarized antenna, characterized in that: include: a mounting cavity having a first opening; an antenna box body, the antenna box body being embedded in the first opening and having a second opening at an end of the antenna box body away from the first opening, the antenna box body being made of plastic; A feeding connector is provided in the second opening, and an antenna radiating plate is provided at the second opening, and the antenna radiating plate and the antenna box body encapsulate the feeding connector accordingly; An antenna cover is provided on the first opening and encapsulates the antenna radiation plate, the feed connector and the antenna box body, and the antenna cover is made of plastic; The antenna radiation plate is provided with a first grounding plate at one end facing the feed connector, and the first grounding plate is used for grounding conduction; the antenna box body is provided with a second grounding plate at one end facing the antenna radiation plate, and a third grounding plate at one end away from the antenna radiation plate; The antenna box body is disc-shaped, and is respectively provided with a first passing hole, a second passing hole, and a third passing hole at different inner diameter sizes, and a fourth passing hole is correspondingly provided at the center of the antenna box body; the first passing hole, the second passing hole, and the third passing hole are respectively evenly distributed along the circumference of the antenna box body; The second ground plate and the third ground plate are respectively provided with a first metal via, a second metal via, a third metal via and a fourth metal via corresponding to the first via hole, the second via hole, the third via hole and the fourth via hole; a feeder cable assembly, the feeder cable assembly being embedded in the mounting cavity and disposed at an end facing away from the first opening; The mounting cavity and the antenna box body are respectively provided with a first through hole and a second through hole passing through the two correspondingly; The plug of the feed cable assembly is embedded in the first through hole, and the socket of the feed connector is embedded in the second through hole. The plug of the feed cable assembly is correspondingly plugged into the socket of the feed connector to stimulate and feed the feed connector.

2. The high temperature resistant wide bandwidth circularly polarized antenna according to claim 1, characterized in that: The antenna radiation plate is provided with a radiation patch and a feed coupling line at one end facing the antenna cover; A third through hole is provided on the antenna radiation plate, and a probe is provided on one end of the feed connector facing the radiation patch. The probe passes through the third through hole and is connected to the radiation patch with solder.

3. The high temperature resistant wide bandwidth circularly polarized antenna according to claim 2, characterized in that: A metallized feeding probe via hole is provided on the first ground plate at a position corresponding to the third through hole, and a clearance ring is provided at the metallized feeding probe via hole, and the clearance ring isolates the first ground plate from the probe.

4. The high temperature resistant wide bandwidth circularly polarized antenna according to claim 2, characterized in that: The radiation patch is arranged in a square shape, and two cut corners are formed at two diagonal corners of the radiation patch; A first strip-shaped notch is opened on one side of the radiation patch, the feed coupling line is correspondingly arranged at the opening of the first strip-shaped notch, and a semicircular cutout is opened on the side opposite to the strip-shaped notch; The radiation patch is provided with second strip notches on the other two sides corresponding to the semicircular cutout and the first strip notch; The ultra-wideband impedance matching and wide-beam radiation of the high-temperature resistant wide-bandwidth circularly polarized antenna are adjusted by the sizes of the first strip notch, the semicircular cutout, and the second strip notch.

5. The high temperature resistant wide bandwidth circularly polarized antenna according to claim 1, characterized in that: The wide beam radiation of the high temperature resistant wide bandwidth circularly polarized antenna is adjusted by the size, number and arrangement interval of the first via hole, the second via hole, the third via hole and the fourth via hole.

6. The high temperature resistant wide bandwidth circularly polarized antenna according to claim 5, characterized in that: A plurality of first protruding columns are evenly distributed along the circumference on one side of the antenna cover facing the installation cavity, and the first protruding columns are arranged corresponding to the first passing holes. The first protruding columns pass through the antenna radiation plate and the antenna box body and abut against the inner wall of the first opening.

7. The high temperature resistant wide bandwidth circularly polarized antenna according to claim 1, characterized in that: An air layer is provided at one end of the antenna cover facing the antenna radiation plate, and the air layer is correspondingly sealed in a closed space formed by the antenna cover and the installation cavity.

8. The high temperature resistant wide bandwidth circularly polarized antenna according to any one of claims 1 to 7, characterized in that: Its application in X / Ku band.

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