Compact millimeter wave flat spiral antenna

Abstract

The utility model discloses a compact millimeter wave flat spiral antenna, which belongs to the technical field of radar antennas and comprises a first mounting cylinder and a second mounting cylinder, a radio frequency connector is arranged in the first mounting cylinder, and the second mounting cylinder is positioned at one end of the first mounting cylinder and is coaxial with the first mounting cylinder. Wherein a microwave cavity is formed in the second mounting cylinder, a feed balun is arranged in the microwave cavity, a feed needle is arranged on the feed balun, a microwave receiving panel is arranged on the end face, away from the first mounting cylinder, of the second mounting cylinder, the microwave receiving panel is connected with the radio frequency connector through the feed needle, and a hemispherical sealing antenna housing covers the second mounting cylinder. A flange is arranged in the sealing radome and abuts against the microwave receiving panel to fix the microwave receiving panel. The millimeter wave antenna is packaged through the hemispherical sealing radome, the antenna gain and the beam width can be enhanced, the microwave receiving panel can be installed and fixed, the structure of the millimeter wave antenna is more compact, and small-size design is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of radar antennas, and more specifically, particularly relates to a compact millimeter-wave flat spiral antenna. Background Art

[0002] Electromagnetic waves with a wavelength of 1 to 10 mm are called millimeter waves. They are located in the wavelength range where microwaves and far-infrared waves overlap, and have the characteristics of both spectra. Therefore, millimeter waves have a large number of applications in communications, radar, remote sensing, radio astronomy and other fields.

[0003] When millimeter wave antennas are used in radar signal reconnaissance and other aspects, they will face high and low altitude and high humidity environments due to the complex and changeable use environment. When used in small missile seeker signal detection, the volume requirements are very high. Therefore, in order to ensure that the millimeter wave antenna can be installed and used more easily, the millimeter wave antenna needs to be further optimized and improved. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a compact millimeter wave flat spiral antenna to solve the technical problem in the prior art that large-volume millimeter wave antennas are not convenient for use in small missile seeker signal detection.

[0005] To achieve the above objectives, the utility model is implemented through the following technical solutions: a compact millimeter-wave flat screw antenna, comprising a first mounting tube and a second mounting tube, wherein a radio frequency connector is arranged in the first mounting tube, the second mounting tube is located at one end of the first mounting tube and is coaxially arranged therewith, the second mounting tube has a microwave cavity, a feeding balun is arranged in the microwave cavity, a feeding pin is arranged on the feeding balun, a microwave receiving panel is arranged on the end face of the second mounting tube away from the first mounting tube, the microwave receiving panel is connected to the radio frequency connector through the feeding pin, a hemispherical sealed antenna cover is provided on the second mounting tube, a flange is provided inside the sealed antenna cover, and the flange abuts against the microwave receiving panel to fix it.

[0006] Optionally, the sealed antenna cover is threadedly connected to the second mounting tube, and an annular groove is provided on the outer wall of the second mounting tube, a sealing ring is embedded in the groove, and the bottom contour of the sealed antenna cover abuts against the sealing ring.

[0007] Optionally, a waterproof and breathable membrane is provided at the bottom of the microwave cavity for isolating the first installation tube and the second installation tube.

[0008] Optionally, a drying film is attached to the waterproof and breathable membrane.

[0009] Optionally, the edge of the microwave receiving panel protrudes outward to form a card block, and a card slot is formed at one end of the second mounting tube, and the card block is locked in the card slot.

[0010] Optionally, a mounting beam is provided at one end of the first mounting tube, mounting screws are provided at both ends of the mounting beam, and a mounting groove is provided at one end of the second mounting tube, the mounting groove is clamped on the mounting beam and fixed by inserting a fastening pin.

[0011] Optionally, a clamping ring coaxial with the mounting screw is fixedly provided on the mounting screw, and the clamping ring is rotatably mounted on the mounting beam.

[0012] Optionally, a vent hole communicating with the outside is provided at the bottom of the microwave cavity.

[0013] Furthermore, the microwave receiving panel is a PCB board.

[0014] Furthermore, the microwave receiving panel includes a spiral first antenna and a second antenna, the first antenna and the second antenna are embedded in each other in the same plane, the first antenna and the second antenna are non-contactly arranged with each other and are respectively connected to the feeding pin.

[0015] The utility model provides a compact millimeter wave flat spiral antenna, which has the following beneficial effects:

[0016] 1. Encapsulating the millimeter-wave antenna with a hemispherical sealed antenna cover can not only enhance the antenna gain and beam width, but also install and fix the microwave receiving panel, making the millimeter-wave antenna structure more compact and conducive to small-volume design.

[0017] 2. By using a sealed antenna cover, a sealing ring, a waterproof breathable membrane, and a drying membrane, a dry space is formed in the microwave cavity, which is beneficial to maintaining the stability of the microwave characteristics of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of the compact millimeter-wave flat spiral antenna provided in this embodiment;

[0019] Figure 2 A schematic diagram of the exploded structure of the compact millimeter wave flat spiral antenna provided in this embodiment;

[0020] Figure 3 A schematic cross-sectional structure diagram of a compact millimeter-wave flat spiral antenna provided in this embodiment;

[0021] Figure 4 A schematic diagram of the structure of the second mounting tube provided in this embodiment;

[0022] Figure 5A schematic diagram of the structure of a microwave receiving panel provided in this embodiment;

[0023] Figure 6 A schematic diagram of the structure of the installation and connection of the microwave receiving panel provided in this embodiment.

[0024] In the figure: 1. first mounting tube; 2. second mounting tube; 201. microwave cavity; 202. groove; 203. card slot; 204. mounting slot; 205. vent hole; 3. RF connector; 4. feeding balun; 5. feeding pin; 6. microwave receiving panel; 601. first antenna; 602. second antenna; 603. card block; 7. sealed antenna cover; 701. flange; 8. sealing ring; 9. waterproof breathable membrane; 10. drying membrane; 11. mounting beam; 12. mounting screw; 13. fastening pin; 14. snap ring. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the implementation of the present utility model in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0026] The utility model provides a technical solution: a compact millimeter wave flat spiral antenna, such as Figure 1 Figure 2 Figure 3 As shown, the antenna body includes a first mounting tube 1 and a second mounting tube 2. The first mounting tube 1 is provided with a radio frequency connector 3, and the second mounting tube 2 is located at one end of the first mounting tube 1 and is coaxially arranged therewith.

[0027] The second mounting tube 2 is made of aluminum alloy and has a microwave cavity 201 inside. A feeding balun 4 is provided in the microwave cavity 201, and a feeding pin 5 is provided on the feeding balun 4. A microwave receiving panel 6 is provided on the end face of the second mounting tube 2 away from the first mounting tube 1. The cavity in the middle is used to form a resonant cavity. The microwave receiving panel 6 is connected to the RF connector 3 through the feeding pin 5, which is used for feeding and impedance matching. A hemispherical sealed antenna cover 7 is provided on the second mounting tube 2. In addition to forming a sealed cavity with the microwave cavity 201, the sealed antenna cover 7 also has the function of enhancing the antenna gain and beam width. In actual application, the sealed antenna cover 7 with different curvatures can be designed according to different usage requirements.

[0028] Among them, Figure 4 Figure 5 As shown, the edge of the microwave receiving panel 6 protrudes outward to form a block 603, and a slot 203 is formed at one end of the second mounting tube 2, and the block 603 is locked in the slot 203. This method can prevent the microwave receiving panel 6 from rotating freely and further reduce the installation space.

[0029] Figure 6As shown, the feed balun 4 and the microwave receiving panel 6 are ultra-thin PCB boards, and the two board surfaces are arranged perpendicular to each other. The two cannot be directly connected, so the feed pin 5 is required as the feeding medium between the two. The microwave receiving panel 6 has a printed metal layer on it for receiving electromagnetic waves from the external environment.

[0030] Specifically, the microwave receiving panel 6 includes a spiral first antenna 601 and a second antenna 602, which are embedded in each other in the same plane, and the shape is similar to a "disc-type mosquito coil". At the same time, the first antenna 601 and the second antenna 602 are non-contacted with each other and are respectively connected to the feeding pin 5.

[0031] like Figure 3 As shown, a flange 701 is provided inside the sealed antenna cover 7, and the flange 701 abuts against the microwave receiving panel 6 to fix it. Installing the microwave receiving panel 6 and the above-mentioned installation structure in this way can save production processes and installation materials, and at the same time make the overall structure of the flat spiral antenna more compact.

[0032] like Figure 2 Figure 3 Figure 4 As shown, the sealed antenna cover 7 is threadedly connected to the second mounting tube 2, and an annular groove 202 is provided on the outer wall of the second mounting tube 2, and a sealing ring 8 is embedded in the groove 202, wherein most of the sealing ring 8 is embedded in the groove 202, and a small part is exposed outside the groove 202, and the bottom contour of the sealed antenna cover 7 abuts against the sealing ring 8. In this way, the sealed antenna cover 7 and the microwave cavity 201 form a closed space to prevent water vapor from intruding, keep the interior dry, and improve the stability and accuracy of the antenna.

[0033] In order to further dry the sealed antenna cover 7 and the interior of the microwave cavity 201, a waterproof and breathable membrane 9 is provided at the bottom of the microwave cavity 201 to separate the first mounting tube 1 and the second mounting tube 2. The waterproof and breathable membrane 9 can pass air and isolate water vapor, thereby keeping the air pressure inside and outside the microwave cavity 201 balanced while preventing water or water vapor from entering.

[0034] In addition, a drying film 10 is attached to the waterproof breathable film 9. The drying film 10 is used to dry the air in the cavity, which can further keep the air inside the microwave cavity 201 dry and maintain the stability of the microwave characteristics of the antenna.

[0035] Considering the problem of air pressure balance after the microwave cavity 201 is sealed. Figure 4 As shown, a vent hole 205 connected to the outside is provided at the bottom of the microwave cavity 201, and air can pass through the vent hole 205 to achieve air pressure balance between the cavity and the external environment. The waterproof breathable membrane 9 blocks the vent hole 205, and the water vapor in the circulating air is also blocked by the waterproof breathable membrane 9 to keep the cavity dry.

[0036] In terms of installation, Figure 1 Figure 2 Figure 3 As shown, a mounting beam 11 is provided at one end of the first mounting tube 1, and a mounting thread is provided at the other end. Mounting screws 12 are provided at both ends of the mounting beam 11, and a mounting groove 204 is provided at one end of the second mounting tube 2. The mounting groove 204 is clamped on the mounting beam 11 and fixed by inserting a fastening pin 13. The fastening pin 13 can fix the first mounting tube 1 and the second mounting tube 2 together. This connection method can prevent the installed RF connector 3 from rotating.

[0037] In addition, Figure 3 As shown, a clamping ring 14 coaxial with the mounting screw 12 is fixedly provided, and the clamping ring 14 is rotatably mounted on the mounting beam 11. The bolt of the mounting screw 12 and the clamping ring 14 clamp the mounting beam 11, so that the mounting screw 12 can rotate on the mounting beam 11, but will not move. The mounting screw 12 is designed near the RF connector 3 because the antenna itself is small in size and the mounting screw 12 is also small and difficult to keep. This solves the problem of the mounting screw 12 falling off after the antenna is disassembled.

[0038] The above description is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and the utility model concept of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model 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 cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A compact millimeter wave flat spiral antenna, characterized in that: The invention comprises a first mounting tube (1) and a second mounting tube (2), wherein a radio frequency connector (3) is arranged in the first mounting tube (1), and the second mounting tube (2) is located at one end of the first mounting tube (1) and is coaxially arranged therewith, wherein a microwave cavity (201) is arranged in the second mounting tube (2), and a feeding balun (4) is arranged in the microwave cavity (201), and a feeding pin (5) is arranged on the feeding balun (4), and a microwave receiving panel (6) is arranged on the end surface of the second mounting tube (2) away from the first mounting tube (1), and the microwave receiving panel (6) is connected to the radio frequency connector (3) via the feeding pin (5), and a hemispherical sealing antenna cover (7) is arranged on the second mounting tube (2), and a flange (701) is arranged inside the sealing antenna cover (7), and the flange (701) abuts against the microwave receiving panel (6) to fix it.

2. The compact millimeter wave flat spiral antenna according to claim 1, characterized in that: The sealed antenna cover (7) is threadedly connected to the second mounting tube (2), and an annular groove (202) is provided on the outer wall of the second mounting tube (2), a sealing ring (8) is embedded in the groove (202), and the bottom contour of the sealed antenna cover (7) abuts against the sealing ring (8).

3. The compact millimeter wave flat spiral antenna according to claim 1, characterized in that: A waterproof and breathable membrane (9) is provided at the bottom of the microwave cavity (201) for isolating the first installation tube (1) and the second installation tube (2).

4. The compact millimeter wave flat spiral antenna according to claim 3, characterized in that: A drying film (10) is attached to the waterproof and breathable film (9).

5. The compact millimeter wave flat spiral antenna according to claim 1, characterized in that: The edge of the microwave receiving panel (6) protrudes outward to form a clamping block (603); one end of the second mounting tube (2) is provided with a clamping groove (203); and the clamping block (603) is clamped in the clamping groove (203).

6. The compact millimeter wave flat spiral antenna according to claim 1, characterized in that: A mounting beam (11) is provided at one end of the first mounting tube (1), mounting screws (12) are provided at both ends of the mounting beam (11), and a mounting groove (204) is provided at one end of the second mounting tube (2), the mounting groove (204) is clamped on the mounting beam (11) and fixed by inserting a fastening pin (13).

7. The compact millimeter wave flat spiral antenna according to claim 6, characterized in that: A clamping ring (14) coaxial with the mounting screw (12) is fixedly arranged on the mounting screw (12), and the clamping ring (14) is rotatably mounted on the mounting beam (11).

8. The compact millimeter wave flat spiral antenna according to any one of claims 1 to 7, characterized in that: The bottom of the microwave cavity (201) is provided with an air hole (205) which is connected to the outside.

9. The compact millimeter wave flat spiral antenna according to any one of claims 1 to 7, characterized in that: The microwave receiving panel (6) is a PCB board.

10. The compact millimeter wave flat spiral antenna according to claim 9, characterized in that: The microwave receiving panel (6) comprises a first spiral antenna (601) and a second spiral antenna (602), wherein the first antenna (601) and the second antenna (602) are mutually embedded in the same plane, and the first antenna (601) and the second antenna (602) are mutually non-contactingly arranged and are respectively connected to the feeding pin (5).

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