RDSS, VSAT compound parabolic antenna device

Abstract

The present invention provides an RDSS and VSAT composite parabolic antenna device, comprising: a VSAT antenna feed, an RDSS antenna feed and a parabolic antenna; the parabolic antenna, the RDSS antenna feed and the VSAT antenna feed are stacked in sequence; the VSAT antenna feed comprises a feeding waveguide, a coaxial multi-ring choke, a sub-reflector bracket and a sub-reflector, and the feeding waveguide, the coaxial multi-ring choke, the sub-reflector bracket and the sub-reflector are stacked in sequence; the RDSS antenna feed comprises an S-band spiral wire, an S-band spiral wire coaxial connector, a feed source mounting plate, an L-band spiral wire coaxial connector and an L-band spiral wire, the S-band spiral wire is arranged on a first side of the feed source mounting plate, the L-band spiral wire is arranged on a second side of the feed source mounting plate opposite to the first side, the S-band spiral wire is fixedly connected to the feed source mounting plate through the S-band spiral wire coaxial connector, and the L-band spiral wire is fixedly connected to the feed source mounting plate through the L-band spiral wire coaxial connector.

Description

Technical Field

[0001] The present disclosure belongs to the field of satellite communication technology, and in particular relates to an RDSS and VSAT composite parabolic antenna device. Background Art

[0002] VSAT (Very Small Aperture Terminal) antenna and RDSS (Radio Determination Satellite System) antenna are both important components of the shipborne communication system. Each of them is a system with its own applications.

[0003] VSAT antennas are responsible for tracking geosynchronous communication satellites, connecting to the ground public network via satellites, and transmitting high-speed signals for use in fishing vessel video monitoring, infotainment, etc.

[0004] RDSS is responsible for tracking RDSS geosynchronous satellites, communicating directly with the command center or specific users in the form of short messages, and is responsible for low-speed information transmission. It is widely used in fishing vessel position monitoring and rescue systems.

[0005] In terms of antenna form, VSAT antennas are generally composed of 0.6 to 2.4 meter parabolas (C, Ku or Ka band). Their frequency is higher and the beam is narrower (1 to 3°). Therefore, an antenna servo stabilization base is generally added to fix the beam to track the synchronous satellite.

[0006] Traditional RDSS antennas are generally microstrip and dipole antennas. The circular polarization synthesis of microstrip antennas is generally composed of two linear polarization power dividers plus a microstrip circuit of a 90-degree phase shifter, which has the characteristics of small size, light weight, high integration and low cost. The dipole antenna mainly uses the unit dipole as the radiation unit of the feed source, avoiding the loss caused by the microstrip antenna medium, so the feed efficiency is higher.

[0007] The above two antennas are limited in size (usually Its gain is not high (-3~5dBi), its side lobes and back lobes are large, and it is easily interfered by other shipborne equipment, which results in it being generally only used near the coast and its application is limited.

[0008] With the development of offshore fishing and transportation, the application scope of Beidou RDSS antennas has gradually expanded from nearshore to mid-sea. As mentioned earlier, due to the limitations of low-gain antennas, the traditional Beidou RDSS service area is limited to the Asia-Pacific region around China, 80-140 degrees east longitude and 5-55 degrees north latitude, which can no longer meet the demand. If it is necessary to expand to other surrounding waters such as Europe and Oceania, it is necessary to further improve the antenna gain, increase the antenna area and use the antenna servo system. If implemented separately, it will greatly increase the complexity and cost of the RDSS antenna. On the other hand, the traditional RDSS and VSAT are each systems, and two antennas need to be installed before they can be used, which increases the requirements for the use site and personnel. There are disadvantages such as high cost and large area, which does not meet the development trend of multi-system high-integration shipborne communication technology.

[0009] With the development of microwave technology, especially the maturity of multi-frequency composite parabolic feed design technology, broadband multi-frequency parabolic antennas that simultaneously cover RDSS (L, S bands) and VSAT (C, Ku, Ka) bands have become possible. Summary of the invention

[0010] In order to solve at least one of the above technical problems, the present disclosure provides a RDSS, VSAT compound parabolic antenna device.

[0011] The RDSS and VSAT composite parabolic antenna devices disclosed in the present invention are implemented through the following technical solutions.

[0012] The RDSS, VSAT composite parabolic antenna device disclosed in the present invention is characterized in that it comprises: a VSAT antenna feed, an RDSS antenna feed and a parabolic antenna; the parabolic antenna, the RDSS antenna feed and the VSAT antenna feed are stacked in sequence; the VSAT antenna feed comprises a feeding waveguide, a coaxial multi-ring choke, a sub-reflector bracket and a sub-reflector, and the feeding waveguide, the coaxial multi-ring choke, the sub-reflector bracket and the sub-reflector are stacked in sequence; the feeding waveguide transmits and radiates electromagnetic waves from the parabolic antenna, the sub-reflector receives and reflects the electromagnetic waves radiated by the feeding waveguide, and after the parabolic antenna reflects and focuses the electromagnetic waves reflected by the sub-reflector, the feeding waveguide radiates the electromagnetic waves reflected and focused by the parabolic antenna for a second time; the RDSS antenna feed comprises an S-band helix, An S-band spiral coaxial connector, a feed source mounting plate, an L-band spiral coaxial connector and an L-band spiral, wherein the S-band spiral is arranged on a first side of the feed source mounting plate, the L-band spiral is arranged on a second side of the feed source mounting plate opposite to the first side, the S-band spiral is fixedly connected to the feed source mounting plate via the S-band spiral coaxial connector, and the L-band spiral is fixedly connected to the feed source mounting plate via the L-band spiral coaxial connector; the RDSS antenna feed transmits and radiates electromagnetic waves from the parabolic antenna, the sub-reflector of the VSAT antenna feed receives and reflects the electromagnetic waves radiated by the RDSS antenna feed, and after the parabolic antenna reflects and focuses the electromagnetic waves reflected by the sub-reflector, the RDSS antenna feed radiates the electromagnetic waves reflected and focused by the parabolic antenna for a second time.

[0013] According to the RDSS and VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the coaxial multi-ring choke compensates for the radiation characteristics of the feeding waveguide by introducing higher-order modes.

[0014] According to the RDSS, VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the coaxial multi-ring choke can adjust the radiation pattern angle of the feeding waveguide.

[0015] According to the RDSS, VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the feed source mounting plate is sleeved on the outside of the feeding waveguide.

[0016] According to the RDSS, VSAT composite parabolic antenna device of at least one embodiment of the present disclosure, the outer conductor of the S-band helical coaxial connector of the RDSS antenna feed is fastened as a whole with the feed mounting plate, and the inner conductor of the S-band helical coaxial connector is connected to the S-band helix; the S-band helical coaxial connector, the feed mounting plate and the S-band helix constitute an S-band circularly polarized helical antenna, which transmits and radiates electromagnetic waves from the parabolic antenna, the sub-reflector of the VSAT antenna feed receives and reflects the electromagnetic waves radiated by the S-band circularly polarized helical antenna, and after the parabolic antenna reflects and focuses the electromagnetic waves reflected by the sub-reflector, the S-band circularly polarized helical antenna performs secondary radiation on the electromagnetic waves reflected and focused by the parabolic antenna.

[0017] According to the RDSS, VSAT composite parabolic antenna device of at least one embodiment of the present disclosure, the outer conductor of the L-band helical coaxial connector of the RDSS antenna feed is fastened as a whole with the feed mounting plate, and the inner conductor of the L-band helical coaxial connector is connected to the L-band helix; the L-band helical coaxial connector, the feed mounting plate and the L-band helix constitute an L-band circularly polarized helical antenna, which transmits and radiates electromagnetic waves from the parabolic antenna, the sub-reflector of the VSAT antenna feed receives and reflects the electromagnetic waves radiated by the L-band circularly polarized helical antenna, and after the parabolic antenna reflects and focuses the electromagnetic waves reflected by the sub-reflector, the L-band circularly polarized helical antenna performs secondary radiation on the electromagnetic waves reflected and focused by the parabolic antenna.

[0018] According to the RDSS, VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the feeding waveguide, coaxial multi-ring choke, sub-reflector, and sub-reflector bracket are all made of non-conductive materials, and the surfaces are coated with conductive materials.

[0019] According to the RDSS and VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the feeding waveguide, the coaxial multi-ring choke, the sub-reflector, and the sub-reflector bracket are all made of conductive materials.

[0020] According to the RDSS, VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the S-band helix, the feed mounting plate, and the L-band helix are all made of non-conductive materials, and the surfaces of the S-band helix are coated with conductive materials.

[0021] According to the RDSS and VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the S-band helical wire, the feed mounting plate, and the L-band helical wire are all made of conductive materials.

[0022] According to the RDSS and VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the parabolic antenna is made of a non-conductive material, and the surface of the parabolic antenna is coated with a conductive material.

[0023] According to the RDSS and VSAT compound parabolic antenna devices of at least one embodiment of the present disclosure, the parabolic antenna is made of a conductive material. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0025] Figure 1 It is a schematic diagram of the RDSS and VSAT separation antenna structure in the prior art.

[0026] Figure 2 It is a schematic diagram of the principle of an RDSS and VSAT compound parabolic antenna device according to an embodiment of the present disclosure.

[0027] Figure 3 It is a schematic diagram of the overall structure of an RDSS and VSAT composite parabolic antenna device according to an embodiment of the present disclosure.

[0028] Figure 4 It is a schematic diagram of the exploded structure of an RDSS and VSAT composite parabolic antenna device according to one embodiment of the present disclosure.

[0029] Figure 5 It is a side view of a structural schematic diagram of an RDSS, VSAT composite parabolic antenna device according to an embodiment of the present disclosure.

[0030] Figure 6 It is a perspective view of a structural schematic diagram of an RDSS and VSAT compound parabolic antenna device according to an embodiment of the present disclosure.

[0031] Figure 7 It is a side view of a schematic structural diagram of an RDSS antenna feed source of an RDSS, VSAT composite parabolic antenna device according to an embodiment of the present disclosure.

[0032] Figure 8 It is a perspective view of a structural schematic diagram of an RDSS antenna feed source of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure.

[0033] Fig. 9It is a schematic structural diagram of an RDSS, VSAT compound parabolic antenna device (1.2 meters) according to an embodiment of the present disclosure.

[0034] Fig.10 It is a Ku-band transmission pattern of an RDSS, VSAT compound parabolic antenna device (1.2 meters) according to one embodiment of the present disclosure.

[0035] Fig.11 It is a Ku-band receiving pattern of an RDSS, VSAT compound parabolic antenna device (1.2 meters) according to one embodiment of the present disclosure.

[0036] Fig.12 It is the S-band radiation pattern of the RDSS, VSAT compound parabolic antenna device (1.2 meters) according to one embodiment of the present disclosure.

[0037] Fig.13 1 is an L-band radiation pattern of an RDSS, VSAT compound parabolic antenna device (1.2 meters) according to one embodiment of the present disclosure.

[0038] Description of Reference Numerals

[0039] 100-RDSS, VSAT compound parabolic antenna assembly

[0040] 10-Parabolic Antenna

[0041] 20-VSAT Antenna Feed

[0042] 21-Feed waveguide

[0043] 22-Coaxial Multi-Ring Choke

[0044] 23-Secondary reflector

[0045] 24-Sub-reflector bracket

[0046] 30-RDSS Antenna Feed

[0047] 31-S Band Helix

[0048] 32-S Band Helix Coaxial Connector

[0049] 33-L Band Helix

[0050] 34-L Band Helix Coaxial Connector

[0051] 35-Feed source mounting plate. DETAILED DESCRIPTION

[0052] The present disclosure is further described in detail below in conjunction with the accompanying drawings and implementations. It is understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0053] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present disclosure can be combined with each other. The technical solution of the present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as providing exemplary features of various details of some ways in which the technical concept of the present disclosure can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present disclosure.

[0055] The use of cross-hatching and / or shading in the accompanying drawings is generally used to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the accompanying drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed in a different order than described. For example, two successively described processes can be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.

[0056] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0057] For descriptive purposes, the present disclosure may use spatially relative terms such as "under," "beneath," "under," "down," "over," "upper," "above," "higher," and "side (e.g., in a "sidewall")," to describe the relationship of one component to another (other) component as shown in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, components described as "under" or "beneath" other components or features would subsequently be positioned "over" the other components or features. Thus, the exemplary term "under" can encompass both the "above" and "below" orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0058] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or the values ​​provided that will be recognized by those of ordinary skill in the art.

[0059] Figure 1 It is a schematic diagram of the RDSS and VSAT separation antenna structure in the prior art. Figure 2 It is a schematic diagram of the principle of an RDSS and VSAT compound parabolic antenna device according to an embodiment of the present disclosure. Figure 3 It is a schematic diagram of the overall structure of an RDSS and VSAT composite parabolic antenna device according to an embodiment of the present disclosure. Figure 4 It is a schematic diagram of the exploded structure of an RDSS and VSAT composite parabolic antenna device according to one embodiment of the present disclosure. Figure 5 It is a side view of a structural schematic diagram of an RDSS, VSAT composite parabolic antenna device according to an embodiment of the present disclosure. Figure 6 It is a perspective view of a structural schematic diagram of an RDSS and VSAT compound parabolic antenna device according to an embodiment of the present disclosure. Figure 7It is a side view of a schematic structural diagram of an RDSS antenna feed source of an RDSS, VSAT composite parabolic antenna device according to an embodiment of the present disclosure. Figure 8 It is a perspective view of a structural schematic diagram of an RDSS antenna feed source of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure.

[0060] The following first combines Figures 2 to 8 The RDSS and VSAT compound parabolic antenna devices disclosed in the present invention are described in detail.

[0061] like Figures 2 to 8 As shown, the RDSS, VSAT composite parabolic antenna device 100 comprises: a VSAT antenna feed 20, an RDSS antenna feed 30 and a parabolic antenna 10; the parabolic antenna 10, the RDSS antenna feed 30 and the VSAT antenna feed 20 are stacked in sequence; the VSAT antenna feed 20 comprises a feeding waveguide 21, a coaxial multi-ring choke 22, a sub-reflector bracket 24 and a sub-reflector 23, and the feeding waveguide 21, the coaxial multi-ring choke 22, the sub-reflector bracket 24 and the sub-reflector 23 are stacked in sequence; the RDSS antenna The feed source 30 includes an S-band spiral wire 31, an S-band spiral wire coaxial connector 32, a feed source mounting plate 35, an L-band spiral wire coaxial connector 34 and an L-band spiral wire 33. The S-band spiral wire 31 is arranged on a first side of the feed source mounting plate 35, and the L-band spiral wire 33 is arranged on a second side of the feed source mounting plate 35 opposite to the first side. The S-band spiral wire 31 is fixedly connected to the feed source mounting plate 35 via the S-band spiral wire coaxial connector 32, and the L-band spiral wire 33 is fixedly connected to the feed source mounting plate 35 via the L-band spiral wire coaxial connector 34.

[0062] Among them, the feeding waveguide tube 21 transmits and radiates the electromagnetic waves from the parabolic antenna 10, the sub-reflector 23 receives the electromagnetic waves radiated by the feeding waveguide tube 21 and reflects them, and after the parabolic antenna 10 reflects and focuses the electromagnetic waves reflected by the sub-reflector 23, the feeding waveguide tube 21 radiates the electromagnetic waves reflected and focused by the parabolic antenna 10 for a second time.

[0063] The RDSS antenna feed 30 transmits and radiates the electromagnetic waves from the parabolic antenna 10. The sub-reflector 23 of the VSAT antenna feed 20 receives and reflects the electromagnetic waves radiated by the RDSS antenna feed 30. After the parabolic antenna 10 reflects and focuses the electromagnetic waves reflected by the sub-reflector 23, the RDSS antenna feed 30 re-radiates the electromagnetic waves reflected and focused by the parabolic antenna 10.

[0064] The RDSS and VSAT composite parabolic antenna device disclosed in the present invention significantly reduces the back lobe and side lobe of the RDSS antenna by reusing the parabola without affecting the VSAT performance, and can better realize the reception and transmission of RDSS signals, thereby improving the performance and integration of the overall system.

[0065] The design of the sub-reflector 23 of the VSAT antenna and the multiplexing parabola antenna 10 must meet the gain and sidelobe requirements of the VSAT antenna.

[0066] In order to reduce the near-axis side lobes, preferably, the diameter of the sub-reflector is selected to be 3-6λ (λ is the working wavelength of the VSAT antenna).

[0067] The design of the multiplexing parabola antenna 10 focuses on antenna gain, side lobes and cross polarization. The antenna aperture is preferably 0.6m to 2.4m, and the focal diameter ratio is preferably between 0.3 and 0.35. The curve design of the sub-reflector 23 and the multiplexing parabola antenna 10 is a standard ring-focus antenna form.

[0068] Preferably, the sub-reflector 23 is an axisymmetric hyperboloid, the multiplexing parabola 10 is an axisymmetric offset focus parabola, and the ring focus of the sub-reflector 23 coincides with the ring focus of the multiplexing parabola 10. Preferably, the phase center of the feeding waveguide 21 is placed at another focusing focus position of the sub-reflector 23.

[0069] The main function of the sub-reflector support 24 is to ensure that the sub-reflector 23 is firmly supported and to minimize the shielding of the parabolic reflector 10. The thickness is generally 0.08 to 0.15λ.

[0070] Preferably, the feeding circular waveguide 21 and the coaxial multi-ring choke 22 are used to meet the illumination requirements for the sub-reflection surface 23 of the VSAT antenna.

[0071] The coaxial multi-ring choke 22 has at least two rings, which can achieve a good choking effect. According to the operating frequency, preferably, the inner diameter of the two rings can be selected to be 1.1-1.6λ, 1.5-2.0λ, and the height of the two rings can be selected to be 0.4-0.6λ. The thickness of the two rings is preferably 0.05-0.1λ.

[0072] The inner diameter of the feeding circular waveguide 21 is determined by the operating frequency and cross-polarization requirements of the VSAT antenna, and is preferably 0.8 to 1.2λ. The half angle of the sub-reflection surface 23 to the feeding circular waveguide 21 is preferably between 55° and 65°.

[0073] The VSAT antenna feed 20 is preferably within a half-angle of 60 degrees to meet the illumination requirements of the multiplexed parabolic antenna 10 and the sub-reflector 23 within a focus diameter ratio range of 0.3 to 0.35.

[0074] According to a preferred embodiment of the present disclosure, the coaxial multi-ring choke 22 of the RDSS and VSAT compound parabolic antenna devices compensates for the radiation characteristics of the feeding waveguide 21 by introducing higher-order modes.

[0075] According to a preferred embodiment of the present disclosure, the coaxial multi-ring choke 22 of the RDSS and VSAT compound parabolic antenna devices can adjust the radiation pattern angle of the feeding waveguide 21 .

[0076] In the above embodiment, the coaxial multi-ring choke 22 compensates for the radiation characteristics of the feeding waveguide 21 by introducing a high-order mode, so that the overall feed source is axisymmetric in a wideband range. In addition, by adjusting the radiation pattern angle of the feeding waveguide 21, it is adapted to paraboloids with different focal ratios.

[0077] It can be seen that the VSAT ring-focus antenna feed 20 disclosed in the present invention not only has a good radiation pattern in a wideband range to facilitate matching with a parabolic antenna, but also has a good axial symmetry in the feed pattern, thereby improving the polarization discrimination rate of the antenna.

[0078] According to a preferred embodiment of the present disclosure, the feed source mounting plate 35 of the RDSS and VSAT compound parabolic antenna devices is sleeved on the outside of the feeding waveguide 21 .

[0079] The outer conductor of the S-band helical coaxial connector 32 of the RDSS antenna feed 30 is fastened to the feed mounting plate 35 as a whole, and the inner conductor of the S-band helical coaxial connector 32 is connected to the S-band helical wire 31; the S-band helical coaxial connector 32, the feed mounting plate 35 and the S-band helical wire 31 constitute an S-band circularly polarized helical antenna, which transmits and radiates the electromagnetic waves from the parabolic antenna 10, and the sub-reflector 23 of the VSAT antenna feed 20 receives the electromagnetic waves radiated by the S-band circularly polarized helical antenna and reflects them. After the parabolic antenna 10 reflects and focuses the electromagnetic waves reflected by the sub-reflector 23, the S-band circularly polarized helical antenna radiates the electromagnetic waves reflected and focused by the parabolic antenna 10 for a second time.

[0080] According to a preferred embodiment of the present disclosure, the outer conductor of the L-band helical coaxial connector 34 of the RDSS antenna feed 30 of the RDSS and VSAT composite parabolic antenna device is fastened together with the feed mounting plate 35, and the inner conductor of the L-band helical coaxial connector 34 is connected to the L-band helical wire 33; the L-band helical coaxial connector 34, the feed mounting plate 35 and the L-band helical wire 33 constitute an L-band circularly polarized helical antenna, which transmits and radiates electromagnetic waves from the parabolic antenna 10, and the sub-reflector 23 of the VSAT antenna feed 20 receives and reflects the electromagnetic waves radiated by the L-band circularly polarized helical antenna. After the parabolic antenna 10 reflects and focuses the electromagnetic waves reflected by the sub-reflector 23, the L-band circularly polarized helical antenna radiates the electromagnetic waves reflected and focused by the parabolic antenna 10 for a second time.

[0081] Exemplarily, the RDSS dual circular polarization antenna feed 30 includes a top S-band circular polarization antenna 31 and a bottom L-band forward feed circular polarization antenna 33. The S-band circular polarization antenna 31 is a helical antenna, and the helical bottom of the S-band circular polarization antenna 31 is connected to the inner conductor of the connector 32 on the feed mounting plate 35 in the middle of the feed rod 21.

[0082] Preferably, the top of the S-band circularly polarized antenna 31 is located close to the focus of the parabola 10 .

[0083] The L-band circularly polarized antenna 33 is a helical antenna, and the top of the L-band helix 33 is connected to the inner conductor of the connector 34 on the feed mounting plate 35 in the middle of the feed rod 21. In order to reduce the impact on the performance of the VSAT antenna, the feed of the RDSS antenna should be as close to the focus of the multiplexing parabolic antenna 10 as possible without blocking the VSAT feed source from the multiplexing parabolic antenna 10.

[0084] The number of spiral turns and the radius of each turn of the L-band spiral 33 and the S-band spiral 31 need to meet the requirements of axial ratio and beam width. In order to reduce the impact on the VSAT antenna and shorten the spiral length, preferably, the number of spiral turns is 1 to 3 turns, and the spiral line width is not greater than λ / 12.

[0085] For example, the axial ratio is less than 1.5dB, and the standing wave ratio is less than 1.5. The diameter and pitch of the helical antenna should be selected so that the axial ratio and standing wave ratio of the feed source in the operating frequency range are optimal. The diameter is preferably 1.2λ~1.5λ, and the pitch is preferably 0.9~1.1λ. By designing within this range, the helical antenna can achieve an axial ratio of less than 2.0dB and a standing wave ratio of less than 1.5.

[0086] Preferably, the feeding waveguide, the coaxial multi-ring choke, the sub-reflector and the sub-reflector bracket are respectively manufactured by integral processing.

[0087] Preferably, the feeding waveguide 21, the coaxial multi-ring choke 22, the sub-reflector 23 and the sub-reflector bracket 24 of the RDSS and VSAT compound parabolic antenna device disclosed in the present invention are all made of non-conductive materials, and the surfaces are coated with conductive materials.

[0088] Preferably, the feeding waveguide 21, the coaxial multi-ring choke 22, the sub-reflector 23 and the sub-reflector bracket 24 of the RDSS and VSAT compound parabolic antenna device disclosed in the present invention are all made of conductive materials.

[0089] Preferably, the S-band helical wire, the feed source mounting plate and the L-band helical wire of the RDSS and VSAT compound parabolic antenna devices disclosed in the present invention are all made of non-conductive materials, and the surfaces thereof are coated with conductive materials.

[0090] Preferably, the S-band helical wire, the feed source mounting plate and the L-band helical wire of the RDSS and VSAT compound parabolic antenna devices disclosed in the present invention are all made of conductive materials.

[0091] Combined with the following Figures 9 to 13 , using a specific preferred embodiment, the specific parameters and technical effects of the dual-frequency dual circular polarization navigation and tracking antenna feed provided by the present disclosure are described in detail. It should be noted that the selected embodiment is only used to illustrate the present disclosure, and does not limit the scope of the present disclosure.

[0092] Take the 1.2m RDSS and VSAT composite parabolic antenna device as an example to explain the overall antenna structure. Fig. 9 shown.

[0093] The VSAT feed source operates in the Ku band, with a receiving frequency of 11.7 GHz and a transmitting frequency of 14.2 GHz. The specific feed source structural parameters are as follows: the inner diameter of the feed waveguide 21 is 23.7 mm, the inner diameters of the double-ring chokes are 32.7 mm and 41.7 mm, respectively, and the heights of the double-ring chokes are 11.6 mm and 11.5 mm, respectively. The diameter of the secondary reflector 23 is 100 mm.

[0094] The RDSS feed sources operate at 1.61568 GHz (L band) and 2.49175 GHz (S band), respectively. The diameter of the S band helix 31 is 38 mm, the pitch is 30 mm, and the number of spiral turns is 1.5. The diameter of the L band helix 33 is 58 mm, the pitch is 32 mm, and the number of spiral turns is 1.5.

[0095] For miniaturization, both the S-band spiral coaxial connector 32 and the L-band spiral coaxial connector 34 are SMA-F coaxial connectors. To reduce shielding, the outer diameter of the feed source mounting plate 35 is 66 mm and the thickness is 2 mm.

[0096] The parabolic antenna 10 matched with the above feed source is a metal ring focal parabola with a diameter of 1.2m and a focal diameter ratio of 0.3. When matched with the feed source, the antenna simulation pattern is as follows Figures 10 to 13 As shown ( Fig.10 , 11 In 1, 2, and 3, the solid line part is the horizontal direction pattern, the dotted line is the elevation direction pattern, the horizontal axis is the angle, the unit is °, the vertical axis is the gain, the unit is dB). The Ku transmit band gain is greater than 42.9dBi, the receive band gain is greater than 41.0dBi, the S band gain is greater than 19.9dBi, the L band gain is greater than 21.4dBi, the antenna efficiency is greater than 60% in the VSAT band, and the S and L band efficiencies are both greater than 50%. The remaining antenna parameters are full-band standing wave <1.5, axial ratio in the S band <1.0dB, and L band less than 1.5dB. The Ku band polarization discrimination rate is >35dB.

[0097] In addition to having good radiation efficiency, directional pattern and polarization discrimination rate within the VSAT frequency range, the 1.2-meter RDSS and VSAT composite parabolic antenna device focuses and amplifies the RDSS feed signal by multiplexing the parabolic antenna in the RDSS frequency band, thereby increasing the antenna gain, ensuring the matching bandwidth and radiation efficiency of the antenna, and forming a low-loss, highly integrated RDSS and VSAT composite parabolic antenna.

[0098] The present invention combines the RDSS antenna with the VSAT parabola, and utilizes the parabola focusing characteristics of the VSAT antenna. On the basis of not affecting the performance of the VSAT antenna, the RDSS feed signal is focused and amplified by multiplexing the parabola antenna, thereby increasing the gain of the RDSS antenna to more than 15dB of the existing antenna, thereby expanding the use range of RDSS from nearshore to mid- and far-sea, and improving the overall integration of the shipborne communication system.

[0099] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0100] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0101] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A RDSS, VSAT composite parabolic antenna device, characterized in that: include: VSAT antenna feed, RDSS antenna feed and parabolic antenna; The parabolic antenna, the RDSS antenna feed, and the VSAT antenna feed are stacked in sequence; The VSAT antenna feed source comprises a feeding waveguide, a coaxial multi-ring choke, a sub-reflector bracket and a sub-reflector, wherein the feeding waveguide, the coaxial multi-ring choke, the sub-reflector bracket and the sub-reflector are stacked in sequence; The feeding waveguide transmits and radiates the electromagnetic waves from the parabolic antenna, the sub-reflector receives and reflects the electromagnetic waves radiated by the feeding waveguide, and after the parabolic antenna reflects and focuses the electromagnetic waves reflected by the sub-reflector, the feeding waveguide radiates the electromagnetic waves reflected and focused by the parabolic antenna for a second time; The RDSS antenna feed includes an S-band spiral wire, an S-band spiral wire coaxial connector, a feed source mounting plate, an L-band spiral wire coaxial connector and an L-band spiral wire, wherein the S-band spiral wire is arranged on a first side of the feed source mounting plate, the L-band spiral wire is arranged on a second side of the feed source mounting plate opposite to the first side, the S-band spiral wire is fixedly connected to the feed source mounting plate via the S-band spiral wire coaxial connector, and the L-band spiral wire is fixedly connected to the feed source mounting plate via the L-band spiral wire coaxial connector; The RDSS antenna feed transmits and radiates the electromagnetic waves from the parabolic antenna, the sub-reflector of the VSAT antenna feed receives and reflects the electromagnetic waves radiated by the RDSS antenna feed, and after the parabolic antenna reflects and focuses the electromagnetic waves reflected by the sub-reflector, the RDSS antenna feed re-radiates the electromagnetic waves reflected and focused by the parabolic antenna.

2. The RDSS, VSAT compound parabolic antenna device according to claim 1, characterized in that: The coaxial multi-ring choke compensates for the radiation characteristics of the feeding waveguide by introducing high-order modes.

3. The RDSS, VSAT compound parabolic antenna device according to claim 1, characterized in that: The coaxial multi-ring choke can adjust the radiation pattern angle of the feeding waveguide.

4. The RDSS, VSAT compound parabolic antenna device according to any one of claims 1 to 3, characterized in that: The feed source mounting plate is sleeved on the outer side of the feeding waveguide tube.

5. The RDSS, VSAT compound parabolic antenna device according to any one of claims 1 to 3, characterized in that: The feeding waveguide, the coaxial multi-ring choke, the sub-reflector and the sub-reflector bracket are all made of non-conductive materials, and the surfaces thereof are coated with conductive materials.

6. The RDSS, VSAT compound parabolic antenna device according to any one of claims 1 to 3, characterized in that: The feeding waveguide, the coaxial multi-ring choke, the sub-reflector and the sub-reflector bracket are all made of conductive materials.

7. The RDSS, VSAT compound parabolic antenna device according to any one of claims 1 to 3, characterized in that: The S-band spiral wire, the feed source mounting plate and the L-band spiral wire are all made of non-conductive materials, and the surfaces of the two are coated with conductive materials.

8. The RDSS, VSAT compound parabolic antenna device according to any one of claims 1 to 3, characterized in that: The S-band spiral line, the feed source mounting plate and the L-band spiral line are all made of conductive materials.

9. The RDSS, VSAT compound parabolic antenna device according to any one of claims 1 to 3, characterized in that: The parabolic antenna is made of non-conductive material, and the surface is coated with conductive material.

10. The RDSS, VSAT compound parabolic antenna device according to any one of claims 1 to 3, characterized in that: The parabolic antenna is made of conductive material.

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