CN111786126A - RDSS, VSAT compound parabolic antenna device - Google Patents

Abstract

The present disclosure provides an RDSS and VSAT compound parabolic antenna device, including: 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 includes Feeding waveguide, coaxial multi-ring choke coil, sub-reflecting surface bracket and sub-reflecting surface, feeding waveguide, coaxial multi-ring choke coil, sub-reflecting surface bracket and sub-reflecting surface are stacked in sequence; RDSS antenna feed includes S-band helix, S-band helix coaxial connector, feeder mounting plate, L-band helix coaxial connector, and L-band helix, the S-band helix is arranged on the first side of the feeder mounting plate, and the L-band helix The helix is arranged on the second side of the feed installation plate opposite to the first side, the S-band helix is fixedly connected to the feeder installation plate through the S-band helix coaxial connector, and the L-band helix is connected to the feeder through the L-band helix. The shaft connector is fixedly connected to the feed mounting plate.

Description

RDSS, VSAT compound parabolic antenna device

technical field

The present disclosure belongs to the technical field of satellite communication, and in particular, the present disclosure relates to an RDSS and VSAT compound parabolic antenna device.

Background technique

The VSAT (Very Small Aperture Terminal) antenna and the RDSS (Radio DeterminationSatel-lite System) antenna are both important components of the shipborne communication system, and they each form a system and have their own applications.

The VSAT antenna is responsible for tracking geostationary communication satellites, connecting with the ground public network through satellites, and responsible for high-speed signal transmission for video surveillance of fishing boats, infotainment, etc.

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

In terms of antenna form, VSAT antennas are generally composed of 0.6-2.4-meter paraboloids (C, Ku or Ka frequency bands), and their frequencies are higher and the beams are narrower (1-3°). It is used to fix the beam to track the geostationary satellite.

The traditional RDSS antennas are generally microstrip and dipole antennas. The circular polarization synthesis of the microstrip antenna is generally composed of two linearly polarized power dividers and a microstrip circuit with a 90-degree phase shifter. It has the characteristics of small size, light weight, high integration and low cost. The oscillator type antenna mainly uses the unit oscillator as the radiating element of the feed source, which avoids the loss caused by the medium of the microstrip antenna, so the feed efficiency is higher.

左右)，其增益不高(-3～5dBi)，旁瓣和后瓣较大，易受到其它船载设备的干扰，导致其一般只能近海使用，应用受限。The above two antennas, due to the limited size (usually

around), its gain is not high (-3 ~ 5dBi), the side lobes and back lobes are large, and it is easy to be interfered by other shipborne equipment, so that it can only be used offshore and its application is limited.

With the development of distant-water fisheries and transportation, in addition, the application scope of Beidou RDSS antennas has gradually expanded from the offshore to the middle and far seas. As mentioned above, due to the limitation 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 needs to expand to other surrounding sea areas such as Europe and Oceania, it is necessary to further increase the antenna gain, increase the antenna area and use the antenna servo system. If it is implemented separately, it will greatly increase the complexity and cost of the RDSS antenna. On the other hand, the traditional RDSS and VSAT are separate systems, and two antennas need to be installed before they can be used, which increases the requirements for the use site and personnel. The development needs of shipborne communication technology trends.

With the development of microwave technology, especially the maturity of multi-frequency compound parabolic feed design technology, broadband multi-frequency parabolic antennas covering VSAT (C, Ku, Ka) frequency bands of RDSS (L and S frequency bands) at the same time become possible.

SUMMARY OF THE INVENTION

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

The RDSS and VSAT compound parabolic antenna devices of the present disclosure are implemented through the following technical solutions.

The RDSS and VSAT compound parabolic antenna device of the present disclosure is characterized by 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 source includes a feeding waveguide, a coaxial multi-ring choke coil, a sub-reflecting surface bracket and a sub-reflecting surface, and the feeding waveguide, the coaxial multi-ring choke coil, and the sub-reflecting surface bracket and the sub-reflection surfaces are stacked in sequence; the feeding waveguide transmits and radiates the electromagnetic wave from the parabolic antenna, the sub-reflecting surface receives the electromagnetic wave radiated by the feeding waveguide and reflects it, and the parabolic antenna After the electromagnetic wave reflected by the sub-reflection surface is reflected and focused, the feed waveguide conducts secondary radiation on the electromagnetic wave reflected and focused by the parabolic antenna; the RDSS antenna feed includes S-band helix and S-band helix A coaxial connector, a feeder mounting plate, an L-band helix coaxial connector, and an L-band helix, the S-band helix is arranged on the first side of the feeder mounting plate, and the L-band helix is arranged On a second side of the feeder mounting plate opposite to the first side, the S-band helix is fixedly connected to the feeder mounting plate through the S-band helix coaxial connector, and the L The frequency band helix is fixedly connected to the feed installation plate through the L-band helix coaxial connector; the RDSS antenna feed transmits and radiates the electromagnetic waves from the parabolic antenna, and the VSAT antenna feed The sub-reflector receives the electromagnetic waves radiated by the RDSS antenna feed and reflects them. After the parabolic antenna reflects and focuses the electromagnetic waves reflected by the sub-reflector, the RDSS antenna feed responds to the waves passing through the paraboloid. The antenna reflects the focused electromagnetic waves for secondary radiation.

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

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

According to the RDSS, VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the feed installation plate is sleeved on the outer side of the feed waveguide.

According to the RDSS, VSAT compound 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 into one piece with the feed installation plate, the S The inner conductor of the frequency band helix coaxial connector is connected with the S frequency band helix; the S frequency band helix coaxial connector, the feed source mounting plate and the S frequency band helix form an S frequency band circularly polarized helix The wire antenna 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 S-band circularly polarized helical antenna. The 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.

According to the RDSS, VSAT compound 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 into one piece with the feed mounting plate, the L The inner conductor of the band helix coaxial connector is connected with the L band helix; the L band helix coaxial connector, the feed source mounting plate and the L band helix form an L band circularly polarized helix The wire antenna transmits and radiates the electromagnetic waves from the parabolic antenna. The sub-reflector of the VSAT antenna feed receives the electromagnetic waves radiated by the L-band circularly polarized helical antenna and reflects them. 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.

According to the RDSS, VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the feeding waveguide, the coaxial multi-loop choke coil, the sub-reflection surface, and the sub-reflection surface bracket are all made of non-conductive materials, and the surfaces are all made of non-conductive materials. Coated with conductive material.

According to the RDSS, VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the feeding waveguide, the coaxial multi-loop choke coil, the sub-reflection surface, and the sub-reflection surface support are all made of conductive materials.

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 are all coated There are conductive materials.

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 conductive materials.

According to the RDSS, 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 is coated with a conductive material.

According to the RDSS, VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the parabolic antenna is made of a conductive material.

Description of drawings

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

FIG. 1 is a schematic structural diagram of a separate antenna for RDSS and VSAT in the prior art.

FIG. 2 is a schematic diagram of the principle of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure.

FIG. 3 is a schematic diagram of the overall structure of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure.

4 is a schematic diagram of an exploded structure of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure.

5 is a side view of a schematic structural diagram of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure.

6 is a perspective view of a schematic structural diagram of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure.

7 is a side view of a schematic structural diagram of an RDSS antenna feed of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure.

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

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

10 is a Ku-band transmit pattern of an RDSS, VSAT compound parabolic antenna device (1.2 meters) according to an embodiment of the present disclosure.

11 is a Ku-band receive pattern of an RDSS, VSAT compound parabolic antenna device (1.2 meters) according to an embodiment of the present disclosure.

12 is an S-band pattern of an RDSS, VSAT compound parabolic antenna device (1.2 meters) according to an embodiment of the present disclosure.

13 is an L-band pattern of an RDSS, VSAT compound parabolic antenna device (1.2 meters) according to an embodiment of the present disclosure.

Description of reference numerals

100-RDSS, VSAT Compound Parabolic Antenna Unit

10-Parabolic Antenna

20-VSAT Antenna Feed

21 - Feed Waveguide

22-Coaxial multi-ring choke coil

23-Sub-reflector

24-Sub-reflector bracket

30-RDSS Antenna Feed

31-S Band Helix

32-S Band Helical Coaxial Connector

33-L Band Helix

34-L Band Helical Coaxial Connector

35 - Feed mounting plate.

Detailed ways

The present disclosure will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the related content, but not to limit the present disclosure. In addition, it should be noted that, for the convenience of description, only the parts related to the present disclosure are shown in the drawings.

It should be noted that the embodiments of the present disclosure and the features of the embodiments may be combined with each other unless there is conflict. The technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

Unless otherwise stated, the illustrated exemplary embodiments/embodiments are to be understood as exemplary features providing various details of some ways in which the technical concept of the present disclosure may be implemented in practice. Therefore, unless otherwise stated, the features of various embodiments/embodiments may be additionally combined, separated, interchanged and/or rearranged without departing from the technical concept of the present disclosure.

The use of cross-hatching and/or hatching in the drawings is generally used to clarify boundaries between adjacent components. As such, unless stated, the presence or absence of cross-hatching or shading does not convey or represent any particular material, material properties, dimensions, proportions, commonalities between the illustrated components and/or any other characteristics of the components, any preferences or requirements for attributes, properties, etc. Furthermore, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. When example embodiments may be implemented differently, the specific process sequence may be performed in a different order than described. For example, two consecutively described processes may be performed substantially concurrently or in the reverse order of that described. In addition, the same reference numerals denote the same components.

When an element is referred to as being "on" or "over", "connected to" or "coupled to" another element, the element can be directly on, directly connected to, the other element Either directly coupled to the other component, or intermediate components may be present. However, when an element is referred to as being "directly on," "directly connected to," or "directly coupled to" another element, there are no intervening elements present. To this end, the term "connected" may refer to a physical connection, electrical connection, etc., with or without intervening components.

For descriptive purposes, the present disclosure may use terms such as "under", "under", "under", "under", "above", "on", "at" Spatially relative terms such as "on", "upper" and "side (eg, in "sidewall")", etc., to describe the relationship between one element and another (other) element as shown in the figures relation. In addition to the orientation depicted in the figures, spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "under" can encompass both an orientation of "above" and "below." In addition, the device may be otherwise oriented (eg, rotated 90 degrees or at other orientations) and, as such, the spatially relative descriptors used herein should be interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. Furthermore, when the terms "comprising" and/or "comprising" and their variants are used in this specification, it is indicated that the stated features, integers, steps, operations, parts, components and/or groups thereof are present, but not excluded One or more other features, integers, steps, operations, parts, components and/or groups thereof are present or additional. Note also that, as used herein, the terms "substantially," "approximately," and other similar terms are used as terms of approximation and not as terms of degree, as they are used to explain what one of ordinary skill in the art would recognize Inherent deviations from measured, calculated and/or provided values.

FIG. 1 is a schematic structural diagram of a separate antenna for RDSS and VSAT in the prior art. FIG. 2 is a schematic diagram of the principle of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure. FIG. 3 is a schematic diagram of the overall structure of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure. 4 is a schematic diagram of an exploded structure of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure. 5 is a side view of a schematic structural diagram of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure. 6 is a perspective view of a schematic structural diagram of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure. 7 is a side view of a schematic structural diagram of an RDSS antenna feed of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure. 8 is a perspective view of a schematic structural diagram of an RDSS antenna feed of an RDSS, VSAT compound parabolic antenna device according to an embodiment of the present disclosure.

The RDSS and VSAT compound parabolic antenna device of the present disclosure will be described in detail below first with reference to FIGS. 2 to 8 .

As shown in FIGS. 2 to 8 , the RDSS and VSAT compound parabolic antenna device 100 includes: 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 sequentially Stacked; VSAT antenna feed 20 includes feed waveguide 21, coaxial multi-ring choke coil 22, sub-reflector support 24 and sub-reflection surface 23, feeding waveguide 21, coaxial multi-loop choke 22, sub-reflector The surface bracket 24 and the sub-reflection surface 23 are stacked in sequence; the RDSS antenna feed 30 includes an S-band helix 31, an S-band helix coaxial connector 32, a feed source mounting plate 35, an L-band helix coaxial connector 34 and The L-band helix 33, the S-band helix 31 is arranged on the first side of the feeder mounting plate 35, the L-band helix 33 is arranged on the second side of the feeder mounting plate 35 opposite to the first side, the S-band helix 31 is fixedly connected to the feeder mounting plate 35 through the S-band helical coaxial connector 32 , and the L-band helix 33 is fixedly connected to the feeder mounting plate 35 through the L-band helical coaxial connector 34 .

The feeding waveguide 21 transmits and radiates the electromagnetic waves from the parabolic antenna 10 , the sub-reflecting surface 23 receives and reflects the electromagnetic waves radiated by the feeding waveguide 21 , and the parabolic antenna 10 reflects and focuses the electromagnetic waves reflected by the sub-reflecting surface 23 Then, the feeding waveguide 21 radiates the electromagnetic wave reflected and focused by the parabolic antenna 10 for the second time.

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 the electromagnetic waves radiated by the RDSS antenna feed 30 and reflects it, and the parabolic antenna 10 responds to the sub-reflection surface 23 After the reflected electromagnetic waves are reflected and focused, the RDSS antenna feed 30 performs secondary radiation on the electromagnetic waves reflected and focused by the parabolic antenna 10 .

The RDSS and VSAT compound parabolic antenna device of the present disclosure greatly reduces the back lobe and side lobe of the RDSS antenna by multiplexing the paraboloid on the basis of not affecting the performance of the VSAT, so that the reception and transmission of the RDSS signal can be better realized, and the overall system can be improved. performance and integration.

The design of the sub-reflector 23 of the VSAT antenna and the multiplexed parabolic antenna 10 needs to meet the gain and side lobe requirements of the VSAT antenna.

In order to reduce the paraxial side lobes, preferably, the diameter of the sub-reflection surface is selected to be 3˜6λ (λ is the working wavelength of the VSAT antenna).

The design of the multiplexed parabolic antenna 10 mainly considers antenna gain, side lobes and cross polarization, the antenna aperture is preferably 0.6m-2.4m, and the focal-diameter ratio is preferably between 0.3-0.35. The curves of the sub-reflector 23 and the multiplexed parabolic antenna 10 are designed in the form of a standard ring focus antenna.

Preferably, the sub-reflection surface 23 is an axis-symmetric hyperboloid, the multiplexing paraboloid 10 is an axis-symmetric defocusing paraboloid, and the circumfocal focus of the sub-reflection surface 23 coincides with that of the multiplexed paraboloid 10 . Preferably, the phase center of the feeding waveguide 21 is placed at another focus position of the sub-reflection surface 23 .

The main function of the sub-reflection surface bracket 24 is to ensure that the sub-reflection surface 23 is firmly supported, and the parabolic reflecting surface 10 is minimally shielded. The general thickness is 0.08 ~ 0.15λ.

Preferably, the feeding circular waveguide 21 and the coaxial multi-ring choke coil 22 are used to satisfy the illumination of the sub-reflection surface 23 of the VSAT antenna.

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

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 0.8-1.2λ. The half-opening angle of the sub-reflection surface 23 to the feeding circular waveguide 21 is preferably between 55° and 65°.

The above-mentioned VSAT antenna feed 20 is preferably within a half-opening angle of 60 degrees, so as to meet the illumination requirements of multiplexing the parabolic antenna 10 and the sub-reflecting surface 23 within the range of the focus diameter ratio of 0.3-0.35.

According to the preferred embodiment of the present disclosure, the coaxial multi-loop choke coil 22 of the RDSS, VSAT compound parabolic antenna device compensates the radiation characteristics of the feeding waveguide 21 by introducing higher-order modes.

According to the preferred embodiment of the present disclosure, the coaxial multi-loop choke coil 22 of the RDSS, VSAT compound parabolic antenna device can adjust the radiation pattern angle of the feeding waveguide 21 .

In the above-mentioned embodiment, the coaxial multi-loop choke coil 22 compensates the radiation characteristics of the feed waveguide 21 by introducing high-order modes, so that the overall feed source is axisymmetric in the broadband range. In addition, by adjusting the radiation pattern angle of the feeding waveguide 21, it can be adapted to paraboloids with different focal diameter ratios.

It can be seen that the VSAT loop focus antenna feed 20 of the present disclosure not only has a good radiation pattern in a broadband range to facilitate matching with a parabolic antenna, but also has a good axis symmetry in the feed pattern, which improves the polarization discrimination of the antenna. Rate.

According to the preferred embodiment of the present disclosure, the feed installation plate 35 of the RDSS, VSAT compound parabolic antenna device is sleeved on the outer side of the feed waveguide 21 .

The outer conductor of the S-band helical coaxial connector 32 of the RDSS antenna feed 30 is fastened together with the feeder mounting plate 35, and the inner conductor of the S-band helical coaxial connector 32 is connected to the S-band helical 31; S The frequency band helical coaxial connector 32 , the feed installation plate 35 and the S frequency band helix 31 form the S frequency band circularly polarized helical antenna, which transmits and radiates the electromagnetic waves from the parabolic antenna 10 , and the secondary reflection of the VSAT antenna feed 20 The surface 23 receives the electromagnetic wave radiated by the S-band circularly polarized helical antenna and reflects it. After the parabolic antenna 10 reflects and focuses the electromagnetic wave reflected by the sub-reflecting surface 23, the S-band circularly polarized helical antenna reflects on the parabolic antenna 10. The focused electromagnetic waves undergo secondary radiation.

According to the preferred embodiment of the present disclosure, the outer conductor of the L-band helix coaxial connector 34 of the RDSS antenna feed 30 of the RDSS, VSAT compound parabolic antenna device is fastened together with the feeder mounting plate 35, and the L-band helix is the same The inner conductor of the shaft connector 34 is connected with the L-band helix 33; the L-band helix coaxial connector 34, the feeder mounting plate 35 and the L-band helix 33 form an L-band circularly polarized helix antenna, and the parabolic antenna The electromagnetic wave of 10 is transmitted and radiated, the sub-reflection surface 23 of the VSAT antenna feed 20 receives the electromagnetic wave radiated by the L-band circularly polarized helical antenna and reflects it, and the parabolic antenna 10 reflects and focuses the electromagnetic wave reflected by the sub-reflection surface 23 Afterwards, the L-band circularly polarized helical antenna performs secondary radiation on the electromagnetic waves reflected and focused by the parabolic antenna 10 .

Exemplarily, the RDSS dual circularly polarized antenna feed 30 includes a top S-band circularly polarized antenna 31 and a bottom L-band feedforward circularly polarized antenna 33 . The S-band circularly polarized antenna 31 is a helical antenna, and the helical bottom of the S-band circularly polarized antenna 31 is connected to the inner conductor of the connector 32 on the feed installation plate 35 in the middle of the feed rod 21 .

Preferably, the top of the S-band circularly polarized antenna 31 is located close to the focal point of the paraboloid 10 .

The L-band circularly polarized antenna 33 is a helical antenna, and the helical 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 as possible to the focus of the multiplexed parabolic antenna 10 on the basis of not blocking the VSAT feed to the multiplexed parabolic antenna 10 .

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

For example, if the axial ratio is less than 1.5dB and the VSWR is less than 1.5, the diameter and pitch of the helical antenna should be selected so that the axial ratio and VSWR of the feed in the operating frequency range can be integrated to achieve the optimum. The helical diameter is preferably 1.2λ˜1.5λ, and the helical pitch is preferably 0.9˜1.1λ. According to the design within this range, the helical antenna can achieve a level where the axial ratio is less than 2.0 dB and the standing wave ratio is less than 1.5.

Preferably, the feeding waveguide, the coaxial multi-ring choke coil, the sub-reflecting surface, and the sub-reflecting surface bracket are respectively manufactured by integral processing.

Preferably, the feed waveguide 21 , the coaxial multi-loop choke coil 22 , the sub-reflection surface 23 and the sub-reflection surface bracket 24 of the RDSS and VSAT compound parabolic antenna devices of the present disclosure are all made of non-conductive materials, and the surfaces are all coated with Covered with conductive material.

Preferably, the feeding waveguide 21 , the coaxial multi-loop choke coil 22 , the sub-reflection surface 23 , and the sub-reflection surface bracket 24 of the RDSS, VSAT compound parabolic antenna device of the present disclosure are all made of conductive materials.

Preferably, the S-band helix, the feed mounting plate, and the L-band helix of the RDSS and VSAT compound parabolic antenna devices of the present disclosure are all made of non-conductive materials, and the surfaces are all coated with conductive materials.

Preferably, the S-band helix, the feed mounting plate and the L-band helix of the RDSS and VSAT compound parabolic antenna devices of the present disclosure are all made of conductive materials.

The specific parameters and technical effects of the dual-frequency dual-circular polarization navigation measurement and control antenna feed provided by the present disclosure are described in detail below with reference to FIGS. 9 to 13 , with a specific preferred embodiment. It should be noted that the selected embodiments are only used to illustrate the present disclosure, but not to limit the scope of the present disclosure.

Taking a 1.2-meter RDSS and VSAT compound parabolic antenna device as an example, the overall antenna structure is shown in Figure 9.

The VSAT feed source works in the Ku frequency band, the receiving frequency is 11.7 GHz, and the transmitting frequency is 14.2 GHz. The specific structural parameters of the feed source are that the inner diameter of the feeding waveguide 21 is 23.7 mm, the inner diameter of the double-ring choke coil is 32.7 mm and 41.7 mm, respectively. mm, the heights of the double-ring chokes are 11.6mm and 11.5mm, respectively. The diameter of the sub-reflection surface 23 is 100 mm.

The RDSS feeds work at 1.61568GHz (L-band) and 2.49175GHz (S-band), respectively. The diameter of the S-band helix 31 is 38mm, the pitch is 30mm, and the number of helix turns is 1.5. The helix diameter of the L-band helix 33 is 58mm, the pitch is 32mm, and the number of turns is 1.5.

In consideration of miniaturization, the S-band helical coaxial connector 32 and the L-band helical coaxial connector 34 are both SMA-F coaxial connectors. In order to reduce shielding, the outer diameter of the feed installation plate 35 is 66 mm, and the thickness is 2 mm.

The parabolic antenna 10 matched with the above feed is a metal ring focal paraboloid with a diameter of 1.2 m and a focal diameter ratio of 0.3. In the case of cooperation with this feed, the antenna simulation pattern is shown in Figures 10 to 13 (the solid line in Figures 10, 11, 12, and 13 is the horizontal pattern, the dotted line is the pitch pattern, and the abscissa is the angle, The unit is °, and the ordinate is the gain, and the unit is dB). The gain of Ku transmit band is greater than 42.9dBi, the gain of receive band is greater than 41.0dBi, the gain of S band is greater than 19.9dBi, the gain of L band is greater than 21.4dBi, the efficiency of the antenna in VSAT band is greater than 60%, and the efficiency of S and L band is greater than 50%. The rest of the antenna parameters are the standing wave in the whole frequency band <1.5, the axial ratio in the S frequency band is <1.0dB, and the L frequency band is less than 1.5dB. The Ku-band polarization discrimination rate is >35dB.

The 1.2-meter RDSS, VSAT compound parabolic antenna device has good radiation efficiency, pattern and polarization discrimination rate in the VSAT frequency range. In the RDSS frequency band, the RDSS feed signal is focused and amplified by the multiplexed parabolic antenna, which increases the antenna gain, ensures the matching bandwidth and radiation efficiency of the antenna, and forms a low-loss, highly integrated RDSS and VSAT compound parabolic antenna.

The present disclosure combines the RDSS antenna with the VSAT paraboloid. By utilizing the parabolic 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 parabolic antenna, thereby improving the gain of the RDSS antenna. To more than 15dB of the existing antenna, the use of RDSS is extended from the offshore to the COSCO sea, and the overall integration of the shipborne communication system is improved.

In the description of this specification, reference to the terms "one embodiment/mode", "some embodiments/modes", "example", "specific example" or "some examples", etc. are meant to be combined with the embodiment/mode or A particular feature, structure, material, or characteristic of the example description is included in at least one embodiment/mode or example of the present disclosure. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment/mode or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments/means or examples. Furthermore, those skilled in the art may combine and combine the different embodiments/modes or examples described in this specification and the features of the different embodiments/modes or examples without conflicting each other.

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

Those skilled in the art should understand that the above-mentioned embodiments are only for clearly illustrating the present disclosure, rather than limiting the scope of the present disclosure. For those skilled in the art, other changes or modifications may also be made on the basis of the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims (10)

1. a RDSS, VSAT compound parabolic antenna device, is characterized in that, comprises: 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 includes a feeding waveguide, a coaxial multi-ring choke coil, a sub-reflecting surface bracket and a sub-reflecting surface, the feeding waveguide, the coaxial multi-ring choke coil, the sub-reflecting surface bracket and the sub-reflecting surface. The reflective surfaces are stacked in sequence; The feeding waveguide transmits and radiates the electromagnetic waves from the parabolic antenna, the sub-reflecting surface receives and reflects the electromagnetic waves radiated by the feeding waveguide, and the parabolic antenna reflects the electromagnetic waves reflected by the sub-reflecting surface. After the electromagnetic wave is reflected and focused, the feeding waveguide conducts secondary radiation on the electromagnetic wave reflected and focused by the parabolic antenna; The RDSS antenna feed includes an S-band helix, an S-band helix coaxial connector, a feeder mounting plate, an L-band helix coaxial connector, and an L-band helix, and the S-band helix is arranged on the On the first side of the feed installation plate, the L-band helix is arranged on the second side of the feed installation plate opposite to the first side, and the S-band helix passes through the S-band helix. The shaft connector is fixedly connected to the feed source installation plate, and the L-band helix is fixedly connected to the feed source installation plate through the L-band helix coaxial connector; The RDSS antenna feed transmits and radiates electromagnetic waves from the parabolic antenna, and the sub-reflector of the VSAT antenna feed receives and reflects the electromagnetic waves radiated by the RDSS antenna feed, and the parabolic surface After the antenna reflects and focuses the electromagnetic wave reflected by the sub-reflection surface, the RDSS antenna feed source performs secondary radiation on the electromagnetic wave reflected and focused by the parabolic antenna. 2 . The RDSS and VSAT compound parabolic antenna device according to claim 1 , wherein the coaxial multi-loop choke coil compensates the radiation characteristics of the feeding waveguide by introducing higher-order modes. 3 . 3 . The RDSS and VSAT compound parabolic antenna device according to claim 1 , wherein the coaxial multi-loop choke coil can adjust the radiation pattern angle of the feeding waveguide. 4 . 4. The RDSS and VSAT compound parabolic antenna device according to any one of claims 1 to 3, wherein the feed source installation plate is sleeved on the outer side of the feed waveguide. 5. The RDSS, VSAT compound parabolic antenna device according to any one of claims 1 to 3, wherein the feeding waveguide, the coaxial multi-ring choke coil, the sub-reflector, and the sub-reflector support are all Made of non-conductive material, and the surface is coated with conductive material. 6. The RDSS, VSAT compound parabolic antenna device according to any one of claims 1 to 3, wherein the feeding waveguide, the coaxial multi-ring choke coil, the sub-reflection surface, and the sub-reflection surface support are all Made of conductive material. 7. The RDSS, VSAT compound parabolic antenna device according to any one of claims 1 to 3, wherein the S-band helix, the feed mounting plate and the L-band helix are all made of non- It is made of conductive material, and the surface is coated with conductive material. 8. The RDSS, VSAT compound parabolic antenna device according to any one of claims 1 to 3, wherein the S-band helix, the feed mounting plate and the L-band helix are all made of conductive material. 9 . The RDSS and VSAT compound parabolic antenna device according to claim 1 , wherein the parabolic antenna is made of non-conductive material, and the surface is coated with conductive material. 10 . 10 . The RDSS and VSAT compound parabolic antenna device according to claim 1 , wherein the parabolic antenna is made of conductive material. 11 .

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