A pop-up broadband monopole antenna

Abstract

The present invention discloses a pop-up broadband monopole antenna, which includes a metal cartridge, an antenna rod, a supporting medium, an SMA radio frequency connector, a pop-up mechanism, and a limiting device; the metal cartridge is a hollow cylinder, a groove is provided on the side of the metal cartridge, and a mounting plate A is provided at the axial center of the metal cartridge to fix the pop-up mechanism; the antenna rod is fixedly connected by the supporting medium and the SMA radio frequency connector, and the SMA radio frequency connector is fixed on the pop-up mechanism; when the antenna is not in operation, the antenna rod is rotated to be parallel to the metal cartridge through the pop-up mechanism and is fixed in the groove on the side of the metal cartridge through the limiting device; when the antenna is in operation, the torsion spring is released freely, and the antenna rod is rotated to be perpendicular to the metal cartridge through the pop-up mechanism, and at this time, the antenna rod and the metal cartridge form a monopole antenna structure. The present invention has a wide working frequency band, can achieve omnidirectional beam coverage, occupies little space in the non-operating state, and is suitable for installation and use on unmanned aerial vehicles or missile-borne platforms.

Description

Technical Field

[0001] The invention belongs to the technical field of radar electronic warfare antennas, and in particular relates to a pop-up broadband monopole antenna. Background Art

[0002] In missile-borne electronic countermeasure systems, in order to detect radar signals, an omnidirectional broadband antenna device is often required. Currently, the antenna forms commonly used in existing missile-borne antennas are mainly vibrator antennas and microstrip antennas. Among them, the impedance bandwidth of microstrip antennas is relatively narrow (relative bandwidth <5%), and omnidirectional beam coverage is difficult to achieve, which limits its application. The length of the vibrator antenna is generally half or one-quarter of the working wavelength. When used in low-frequency bands, due to its large size, it is impossible to achieve a low profile, which affects the aerodynamic performance of the aircraft, so it is difficult to use on missile-borne platforms. Summary of the invention

[0003] The object of the present invention is to provide a pop-up broadband monopole antenna having both broadband and omnidirectional coverage performances, and the antenna occupies a small space and can be installed in a confined space.

[0004] The technical solution to achieve the purpose of the present invention is: a pop-up broadband monopole antenna, including a metal cylinder, an antenna rod, a supporting medium, an SMA radio frequency connector, a pop-up mechanism, and a limit device;

[0005] The metal cartridge is a hollow cylindrical structure, a groove is provided on the side of the metal cartridge, and a mounting plate A is provided at the axial center of the metal cartridge to fix the ejection mechanism;

[0006] The antenna rod is fixedly connected to the SMA radio frequency connector via a supporting medium, and the SMA radio frequency connector is fixed to the pop-up mechanism;

[0007] When the antenna is not in operation, the antenna rod is rotated to be parallel to the metal barrel through the pop-up mechanism and is fixed in the groove on the side of the metal barrel through the limit device; when the antenna is in operation, the torsion spring is released freely, and the antenna rod is rotated to be perpendicular to the metal barrel through the pop-up mechanism. At this time, the antenna rod and the metal barrel form a monopole antenna structure.

[0008] Furthermore, the antenna rod is composed of an outer sleeve and an inner screw, both of which are hollow cylinders, and fine threads are provided on the inner walls of the outer sleeve and the inner screw, and the total length of the antenna rod can be changed by rotating the outer sleeve.

[0009] Furthermore, the pop-up mechanism consists of a torsion spring, a mounting plate B, and a mounting plate C, wherein the mounting plate B is fixed together with the SMA RF connector, the mounting plate C is fixed together with the mounting plate A in the metal cartridge, and the mounting plate B and the mounting plate C are connected together by a torsion spring.

[0010] Furthermore, the inner screw and the SMA RF connector are both provided with metal flanges, the supporting medium is provided with four threaded holes, and the inner screw, the supporting medium and the SMA RF connector are fixed together with screws; the bottom end of the inner screw is connected to the inner conductor of the SMA RF connector.

[0011] Furthermore, the torsion spring is opened at an angle of 180° in a free state; when the antenna is not in operation, the torsion spring is compressed by an external force, and the antenna rod is rotated to be parallel to the metal cylinder.

[0012] Furthermore, the material used for the metal cartridge is 6061 aluminum.

[0013] Furthermore, the length of the antenna rod is 0.25λ, where λ is the wavelength corresponding to the center frequency.

[0014] Furthermore, the bottom end of the inner screw is conical, which is used for matching impedance and adjusting the working frequency band.

[0015] Furthermore, the limit device is provided with an electric control switch, and the limit is cancelled by an electric control signal.

[0016] Furthermore, the groove is arranged in the lower half of the metal cartridge, and the mounting plate A is located at the top of the groove.

[0017] Compared with the prior art, the present invention has the following significant advantages: (1) a wide working frequency bandwidth is achieved, with a relative bandwidth ≥ 40%; (2) when the antenna is not in operation, it can be hidden in a groove on the side of the cartridge, does not protrude from the cartridge surface, and occupies little space; (3) when the antenna is in operation, it can form omnidirectional beam coverage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0019] Figure 2 It is a side view of the antenna of the present invention in a folded state.

[0020] Figure 3 It is a side view of the antenna of the present invention in a pop-up state.

[0021] Figure 4 It is a partial view of the antenna rod, the supporting medium and the radio frequency connector in the present invention.

[0022] Figure 5 It is a partial view of the ejection mechanism in the present invention.

[0023] Figure 6 It is a typical standing wave diagram of the embodiment of the present invention.

[0024] Figure 7It is a typical directional diagram of an embodiment of the present invention.

[0025] In the figure, 1. metal cylinder; 2. antenna rod; 3. supporting medium; 4. SMA RF connector; 5. ejection mechanism; 6. limit device; 7 groove; 8 mounting plate A; 9 outer sleeve; 10 inner screw; 11 mounting plate B; 12 mounting plate C; 13 torsion spring. DETAILED DESCRIPTION

[0026] The present invention discloses a pop-up broadband monopole antenna, which comprises a metal cylinder 1, an antenna rod 2, a supporting medium 3, an SMA radio frequency connector 4, a pop-up mechanism 5, and a limiting device 6;

[0027] The metal cartridge 1 is a hollow cylindrical structure, a groove 7 is provided on the side of the metal cartridge 1, and a mounting plate A8 is provided at the axial center of the metal cartridge 1 for fixing the ejection mechanism 5;

[0028] The antenna rod 2 is fixedly connected to the SMA radio frequency connector 4 via a supporting medium 3, and the SMA radio frequency connector 4 is fixed on the pop-up mechanism 5;

[0029] When the antenna is not in operation, the antenna rod 2 is rotated to be parallel to the metal cylinder 1 through the pop-up mechanism 5 and is fixed in the groove 7 on the side of the metal cylinder 1 through the limit device 6; when the antenna is in operation, the torsion spring 13 is released freely, and the antenna rod 2 is rotated to be perpendicular to the metal cylinder 1 through the pop-up mechanism 5. At this time, the antenna rod 2 and the metal cylinder 1 form a monopole antenna structure.

[0030] As a specific implementation, the antenna rod 2 is composed of an outer sleeve 9 and an inner screw 10. The outer sleeve 9 and the inner screw 10 are both hollow cylinders. Fine threads are provided on the inner wall of the outer sleeve 9 and the outer wall of the inner screw 10. The total length of the antenna rod 2 can be changed by rotating the outer sleeve 9.

[0031] As a specific implementation, the pop-up mechanism 5 is composed of a torsion spring 13, a mounting plate B11, and a mounting plate C12, wherein the mounting plate B11 is fixed together with the SMA RF connector 4, the mounting plate C12 is fixed together with the mounting plate A8 in the metal cartridge 1, and the mounting plate B11 and the mounting plate C12 are connected together by a torsion spring 13.

[0032] As a specific implementation manner, the inner screw 10 and the SMA RF connector 4 are both provided with metal flanges, the supporting medium 3 is provided with four threaded holes, and the inner screw 10, the supporting medium 3 and the SMA RF connector 4 are fixed together with screws; the bottom end of the inner screw 10 is connected to the inner conductor of the SMA RF connector 4.

[0033] As a specific implementation, the torsion spring 13 is opened at an angle of 180° in a free state; when the antenna is not in operation, the torsion spring 13 is compressed by an external force, and the antenna rod 2 is rotated to be parallel to the metal cylinder 1.

[0034] As a specific implementation, the material used for the metal cartridge 1 is 6061 aluminum.

[0035] As a specific implementation, the length of the antenna rod 2 is 0.25λ, where λ is the wavelength corresponding to the center frequency.

[0036] As a specific implementation, the bottom end of the inner screw 10 is conical, which is used for matching impedance and adjusting the working frequency band.

[0037] As a specific implementation, the limit device 6 is provided with an electric control switch, and the limit is cancelled by an electric control signal.

[0038] As a specific implementation, the groove 7 is arranged in the lower half of the metal cartridge 1 , and the mounting plate A8 is located at the top of the groove 7 .

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example

[0041] In this embodiment, Figure 1 As shown, a pop-up broadband monopole antenna is composed of a metal cylinder 1, an antenna rod 2, a supporting medium 3, a radio frequency connector 4, a pop-up mechanism 5, and a limit device 6. The metal cylinder is a hollow cylindrical structure. A mounting plate A8 for fixing the pop-up mechanism is provided at the axial center of the metal cylinder. A groove 7 is provided on the lower half of the side of the metal cylinder.

[0042] like Figure 2 As shown, the antenna can be hidden in the groove 7 on the side of the cartridge when not in operation, and will not protrude from the surface of the cartridge.

[0043] like Figure 3 As shown, when the antenna is in working state, the antenna rod is pushed out of the groove 7 by the ejection device and rotated to a direction perpendicular to the metal cartridge 1.

[0044] like Figure 4As shown, the antenna rod 2 is composed of an outer sleeve 9 and an inner screw 10. The outer sleeve 9 and the inner screw 10 are both hollow cylinders, and there are fine threads on the inner wall of the outer sleeve and the outer wall of the inner screw. The total length of the antenna rod 2 can be changed by rotating the outer sleeve 9. Because the resonant frequency of the monopole antenna is mainly determined by the length of the antenna, the length of the antenna rod 2 can be adjusted during the debugging process to make the antenna standing wave reach the best in the required working frequency band. There are metal flanges on the inner screw 10 and the SMA RF connector 4, and there are 4 threaded holes on the supporting medium 3. The inner screw 10, the supporting medium 3 and the SMA RF connector 4 can be fixed together with screws. The bottom end of the inner screw is connected to the inner conductor of the SMA RF connector.

[0045] like Figure 5 As shown, the ejection mechanism is composed of a torsion spring 13, a mounting plate B11, and a mounting plate C12, wherein the mounting plate B11 is fixed together with the SMA RF connector 4, the mounting plate C12 is fixed together with the metal cartridge 1, and the mounting plate B11 and the mounting plate C12 are connected together by the torsion spring 13. The torsion spring 13 is opened at an angle of 180° in a free state. When the antenna is not in operation, the torsion spring 13 is compressed by an external force, and the antenna rod 2 is rotated to be parallel to the metal cartridge 1.

[0046] In the specific implementation, the corresponding structural settings also include:

[0047] The metal cartridge 1 is made of 6061 aluminum, which has good mechanical strength and processing performance, is resistant to corrosion and oxidation after surface electroplating, and has high reliability.

[0048] Preferably, the length of the antenna rod 2 is about 0.25λ (λ is the wavelength corresponding to the center frequency).

[0049] Preferably, the bottom of the inner screw 10 is conical, and this configuration can achieve better impedance matching and a wider operating frequency band.

[0050] In particular, the limit device is equipped with an electric control switch, and the limit can be cancelled by an electric control signal.

[0051] like Figure 6-7 As shown, through testing, in the frequency band range of f0 to 1.5f0, the standing wave is less than 1.6, which meets the engineering requirements for antenna standing waves, and the typical antenna radiation pattern is approximately circular, which meets the engineering requirements for omnidirectional antenna radiation patterns.

[0052] Although embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A pop-up broadband monopole antenna, characterized in that: It comprises a metal cartridge (1), an antenna rod (2), a supporting medium (3), an SMA radio frequency connector (4), an ejection mechanism (5), and a limiting device (6); The metal cartridge (1) is a hollow cylindrical structure, a groove (7) is provided on the side of the metal cartridge (1), and a mounting plate A (8) is provided at the axial center of the metal cartridge (1) for fixing the ejection mechanism (5); The antenna rod (2) is fixedly connected to an SMA radio frequency connector (4) via a supporting medium (3), and the SMA radio frequency connector (4) is fixed to a pop-up mechanism (5); When the antenna is not in operation, the antenna rod (2) is rotated to be parallel to the metal cartridge (1) through the ejection mechanism (5) and is fixed in a groove (7) on the side of the metal cartridge (1) through the limit device (6); when the antenna is in operation, the torsion spring (13) is released freely and the antenna rod (2) is rotated to be perpendicular to the metal cartridge (1) through the ejection mechanism (5), and at this time, the antenna rod (2) and the metal cartridge (1) form a monopole antenna structure; The antenna rod (2) is composed of an outer sleeve (9) and an inner screw (10); the outer sleeve (9) and the inner screw (10) are both hollow cylindrical in shape; the inner wall of the outer sleeve (9) and the outer wall of the inner screw (10) are provided with fine threads; and the total length of the antenna rod (2) can be changed by rotating the outer sleeve (9); The ejection mechanism (5) is composed of a torsion spring (13), a mounting plate B (11), and a mounting plate C (12), wherein the mounting plate B (11) is fixed together with the SMA radio frequency connector (4), the mounting plate C (12) is fixed together with the mounting plate A (8) in the metal cartridge (1), and the mounting plate B (11) and the mounting plate C (12) are connected together via the torsion spring (13).

2. The pop-up broadband monopole antenna according to claim 1, characterized in that: The inner screw rod (10) and the SMA radio frequency connector (4) are both provided with metal flanges, the supporting medium (3) is provided with four threaded holes, and the inner screw rod (10), the supporting medium (3) and the SMA radio frequency connector (4) are fixed together by screws; the bottom end of the inner screw rod (10) is connected to the inner conductor of the SMA radio frequency connector (4).

3. The pop-up broadband monopole antenna according to claim 1, characterized in that: The torsion spring (13) is opened at an angle of 180° in a free state; when the antenna is not in operation, the torsion spring (13) is compressed by an external force, and the antenna rod (2) is rotated to be parallel to the metal cartridge (1).

4. The pop-up broadband monopole antenna according to claim 1, characterized in that: The material used for the metal cartridge (1) is 6061 aluminum.

5. The pop-up broadband monopole antenna according to claim 1, characterized in that: The length of the antenna rod (2) is 0.25 λ , λ is the wavelength corresponding to the center frequency.

6. The pop-up broadband monopole antenna according to claim 1, characterized in that: The bottom end of the inner screw (10) is conical and is used for matching impedance and adjusting the working frequency band.

7. The pop-up broadband monopole antenna according to claim 1, characterized in that: The limit device (6) is provided with an electric control switch, and the limit is cancelled through an electric control signal.

8. The pop-up broadband monopole antenna according to claim 1, characterized in that: The groove (7) is arranged at the lower half of the metal cartridge (1), and the mounting plate A (8) is located at the top of the groove (7).

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