X-band measurement and control antenna

Abstract

The utility model relates to the technical field of satellite antennas, in particular to an X-band measurement and control antenna, which comprises an antenna body, a bottom plate and a connector. The antenna body is of a hollow cone structure, and a connecting flange is arranged at the bottom; the top of the outer conical surface of the antenna body is provided with a pair of through holes, and the bottom is provided with a pair of connecting guide columns extending inwards. The bottom plate is fixedly connected to the bottom of the antenna body, and the center of the bottom plate is provided with a through channel; the connector is fixedly arranged below the bottom plate and is provided with an inner conductor and an outer conductor which extend towards the interior of the antenna body in a penetrating manner; a pair of copper wires are spirally wound on the outer conical surface of the antenna body, and the top end of each copper wire is electrically connected with the inner conductor through the through hole; and the bottom end of each copper wire is electrically connected with the outer conductor through the connecting guide column. The utility model not only has low overall quality and meets the use requirements of small satellites, but also can work in a measurement and control signal transmission system of an X frequency band.

Description

TECHNICAL FIELD

[0001] The utility model relates to satellite antenna technical field, concretely relates to a kind of X frequency band TT&C antenna. BACKGROUND

[0002] Although the existing helical antenna can realize beamforming, it has the advantages of small installation area, good circular polarization and wide bandwidth, and therefore plays an important role in the field of satellite communication. However, the existing helical antenna is mainly applied in L and S frequency band data transmission systems. Small satellites refer to artificial satellites with a weight of less than 1000 kg, which are subject to volume and weight constraints. Therefore, there are strict energy design limitations. Since small satellites usually work in X-band TT&C systems, it is necessary to improve the existing helical antenna to meet the X-band usage requirements of small satellites. SUMMARY

[0003] The utility model provides a kind of X frequency band TT&C antenna, not only its overall quality is low, meet the usage demand of small satellite, it can also work in X frequency band TT&C signal transmission system.

[0004] To achieve the above purpose, the utility model provides the following technical scheme: an X frequency band TT&C antenna, comprising: an antenna body, a bottom plate and a connector; the antenna body is a hollow cone structure, and a connecting flange is provided at the bottom; a pair of through holes are provided at the top of the outer cone surface of the antenna body, and a pair of inwardly extending connecting guide posts are provided at the bottom; the bottom plate is fixedly connected to the bottom of the antenna body, and a through channel is provided in the center; the connector is fixedly arranged below the bottom plate, and the through channel is provided with an inner conductor and an outer conductor extending into the interior of the antenna body; a pair of copper wires are spirally wound on the outer cone surface of the antenna body, and the top end of each copper wire is electrically connected to the inner conductor through the through hole; the bottom end of each copper wire is electrically connected to the outer conductor through the connecting guide post.

[0005] Preferably, the antenna body is made of polyimide.

[0006] Preferably, the copper wire is provided with a gold plating layer on the outside.

[0007] Preferably, a plurality of screw holes and through holes are alternately provided around the edge of the bottom plate; the connecting flange is connected to the corresponding screw hole through a through bolt; and the connecting flange is provided with a slot corresponding to each through hole.

[0008] Preferably, the connector is an SMA-K connector.

[0009] The utility model has the advantages that the overall outer diameter of the X-band measurement and control antenna can be customized as 29mm, the overall height is 28.75mm, the connector height at the bottom is 9.7mm, therefore, the miniaturization requirement is met, and the overall quality is reduced, in addition, the X-band measurement and control antenna is fixedly connected with equipment through the bolt penetrating through the through hole, so that the installation stability of the X-band measurement and control antenna is improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0011] Figure 1 , for the antenna standing wave test result;

[0012] Figure 2 , for the antenna gain test result (7240MHz);

[0013] Figure 3 , for the antenna gain test result (8100MHz);

[0014] Figure 4 , for the antenna gain test result (8200MHz);

[0015] Figure 5 , for the antenna gain test result (8300MHz);

[0016] Figure 6 , for the antenna axial ratio test result (7240MHz);

[0017] Figure 7 , for the antenna axial ratio test result (8100MHz);

[0018] Figure 8 , for the antenna axial ratio test result (8200MHz);

[0019] Figure 9 , for the antenna axial ratio test result (8300MHz);

[0020] Figure 10, it is whole structure schematic view of the utility model;

[0021] Figure 11 , it is bottom structure schematic view of the utility model.

[0022] In the drawing: 1, antenna body;2, connecting flange;3, connecting guide column;4, bottom plate;5, connector;6, copper wire;7, screw hole;8, through hole;9, slot. Specific implementation

[0023] The technical scheme of the utility model will be described clearly and completely below in combination with the drawings of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] According to Figure 10 、 Figure 11 As shown in the figure, an X-band measurement and control antenna comprises an antenna body 1, a bottom plate 4 and a connector 5;The antenna body 1 is a hollow cone structure, and the bottom is provided with a connecting flange 2;The top of the outer cone surface of the antenna body 1 is provided with a pair of through holes, and the bottom is provided with a pair of inwardly extending connecting guide columns 3;The bottom plate 4 is fixedly connected to the bottom of the antenna body 1, and the center is provided with a through channel;The connector 5 is fixedly arranged below the bottom plate 4, and is provided with an inner conductor and an outer conductor extending to the inside of the antenna body 1;The outer cone surface of the antenna body 1 is spirally wound with a pair of copper wires 6, and the top end of each copper wire 6 is electrically connected with the inner conductor through the through hole;The bottom end of each copper wire 6 is electrically connected with the outer conductor through the connecting guide column 3;In addition, the connector 5 is an SMA-K connector, the antenna body is made of polyimide, and the copper wire 6 is provided with a gold plating layer outside.

[0025] In the above setting, the overall outer diameter of the X-band measurement and control antenna can be customized to 29mm, the overall height is 28.75mm, and the height of the bottom connector 5 is 9.7mm, so as to meet the miniaturization requirement and reduce the overall quality.

[0026] In addition, the frequency band range of the X-band measurement and control antenna is: 7238MHz~7245MHz;8093MHz~8100MHz;Gain: better than 1dBi, θ≥60º;Beam width: better than ±70°;Polarization mode: left-handed circular polarization;Axial ratio: <6dB;Voltage standing wave ratio: ≤2;Connector: SMA-K, 50Ω, and is in the form of external screw and internal hole. In order to verify the above indexes, the following test operation steps are carried out in the test system:

[0027] 1. Install the standard gain TT&C antenna of corresponding frequency on the test turntable, and adjust the TT&C aperture to the horizontal state by using the level.

[0028] 2. Measure the standard gain TT&C antenna: rotate the test turntable, automatically collect the measurement data Theta: -180~+180°, phi: 0-180° by the data acquisition system every 0.5°, save the measurement data and form a file for later processing.

[0029] 3. Disassemble the measured standard gain TT&C antenna, install the antenna to be measured on the test turntable, and adjust the antenna aperture to the horizontal state.

[0030] 4. After measurement, disassemble the antenna, process the data, import the test data of the standard TT&C antenna and the test data of the antenna to be measured into the test software, and export the test data of the entire beam of the antenna to be measured.

[0031] 5. Process the test data, obtain the required data, and write a test report.

[0032] The standing wave test results of the X TT&C antenna obtained by the microwave anechoic chamber test are shown in Figure 1 From the figure, it can be seen that the standing wave ratio of the X TT&C antenna is less than 1.6, meeting the index requirements.

[0033] The pattern of the X TT&C antenna obtained by the microwave anechoic chamber test is shown in Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 From the figure, it can be seen that the peak gain of the X TT&C antenna is greater than 6dB, and the antenna gain in the ±60 degree range is greater than 1dB, meeting the index requirements.

[0034] The axial ratio of the X TT&C antenna obtained by the microwave anechoic chamber test is shown in Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 From the figure, it can be seen that the axial ratio of the X TT&C antenna in the ±60 degree range is less than 6dB.

[0035] In summary, the anechoic chamber test of the X-band TT&C antenna is summarized in the following table:

[0036] Name Antenna index Test result Conclusion X-band TT&C antenna a Frequency band range: 7238-7245 MHz; 8093-8100 MHz; b Gain: better than 1 dBi, θ≥60°; beam width: better than ±70°; c Polarization: left-hand circular polarization; d Axial ratio: <6 dB; e Voltage standing wave ratio: ≤2; f Connector: SMA-K, 50 Ω male screw female hole; a Frequency band range: 7238-7245 MHz; 8093-8100 MHz; b Gain: better than 1 dBi, θ≥60°; beam width: better than ±70°; c Polarization: left-hand circular polarization; d Axial ratio: <5 dB; e Voltage standing wave ratio: ≤1.6; f Connector: SMA-K, 50 Ω external screw internal hole; Comply

[0037] In some embodiments, the X-band TT&C antenna is provided with a plurality of screw holes 7 and through holes 8 alternately arranged around the edge of the bottom plate 4; the connecting flange 2 is connected with the corresponding screw holes 7 through penetrating bolts; and the connecting flange 2 is respectively provided with a slot 9 corresponding to each through hole 8. Through the structure, the X-band TT&C antenna is fixedly connected with the equipment through the bolts penetrating the through holes 8, thereby improving the installation stability of the X-band TT&C antenna.

[0038] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An X-band TT&C antenna, characterized in that, The utility model relates to an antenna structure, including: Antenna body (1), bottom plate (4) and connector (5); The antenna body (1) is hollow cone structure, and is equipped with connecting flange (2) at bottom; The top of the outer cone surface of the antenna body (1) is provided with a pair of through holes, and the bottom is provided with a pair of inwardly extending connecting guide posts (3); The bottom plate (4) is fixedly connected to the bottom of the antenna body (1), and a through channel is provided in the center; The connector (5) is fixedly arranged below the bottom plate (4), and is provided with an inner conductor and an outer conductor extending to the inside of the antenna body (1); The outer cone surface of the antenna body (1) is spirally wound with a pair of copper wires (6), the top end of each copper wire (6) is electrically connected with the inner conductor through the through hole, and the bottom end of each copper wire (6) is electrically connected with the outer conductor through the connecting guide post (3).

2. The X-band TT&C antenna according to claim 1, characterized in that: The antenna body is made of polyimide.

3. The X-band TT&C antenna according to claim 1, characterized in that: The copper wire (6) is provided with a gold plating layer outside.

4. The X-band TT&C antenna according to claim 1, characterized in that: A plurality of screw holes (7) and through holes (8) are alternately arranged around the edge of the bottom plate (4); the connecting flange (2) is connected with the corresponding screw hole (7) through a penetrating bolt; and the connecting flange (2) is respectively provided with a slot (9) corresponding to each through hole (8).

5. The X-band TT&C antenna according to claim 1, characterized in that: The connector (5) is an SMA-K connector.

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