CN111786126A

CN111786126A - RDSS (radio data system) and VSAT (very small aperture terminal) composite parabolic antenna device

Info

Publication number: CN111786126A
Application number: CN202010769416.5A
Authority: CN
Inventors: 王家齐; 张国安; 司礼
Original assignee: Changshu Dashunweier Communication Technology Co ltd
Current assignee: Changshu Dashunweier Communication Technology Co ltd
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2020-10-16

Abstract

The present disclosure provides an RDSS, VSAT compound parabolic antenna apparatus, comprising: VSAT antenna feed source, RDSS antenna feed source and parabolic antenna; the parabolic antenna, the RDSS antenna feed source and the VSAT antenna feed source are sequentially superposed; the VSAT antenna feed source comprises a feed waveguide, a coaxial multi-ring choke coil, an auxiliary reflecting surface support and an auxiliary reflecting surface, wherein the feed waveguide, the coaxial multi-ring choke coil, the auxiliary reflecting surface support and the auxiliary reflecting surface are sequentially superposed; RDSS antenna feed includes the S frequency channel helix, S frequency channel helix coaxial connector, the feed mounting disc, L frequency channel helix coaxial connector and L frequency channel helix, the S frequency channel helix sets up the first side at the feed mounting disc, the second side relative with the first side at the feed mounting disc is set up to L frequency channel helix, the S frequency channel helix passes through S frequency channel helix coaxial connector and feed mounting disc fixed connection, L frequency channel helix passes through L frequency channel helix coaxial connector and feed mounting disc fixed connection.

Description

RDSS (radio data system) and VSAT (very small aperture terminal) composite parabolic antenna device

Technical Field

The utility model belongs to the technical field of satellite communication, the utility model especially relates to a RDSS, VSAT compound parabolic antenna device.

Background

Vsat (very Small Aperture terminal) antennas and RDSS (Radio termination satellite-lite System) antennas are important components of ship-borne communication systems, and both become systems and have applications.

The VSAT antenna is responsible for tracking a geosynchronous communication satellite, is connected with a ground public network through the satellite, is responsible for high-speed signal transmission, and is used for video monitoring, information entertainment and the like of a fishing boat.

The RDSS is responsible for tracking the RDSS geostationary satellite, directly communicates with a command center or a specific user in a short message mode, is responsible for low-speed information transmission, and is widely applied to fishery ship position monitoring and rescue systems.

In the antenna form, the VSAT antenna is generally composed of 0.6-2.4 m paraboloids (C, Ku or Ka band), and has a high frequency and a narrow beam (1-3 °), so that a servo stabilizing base of the antenna is generally added for fixing and tracking the beam to the geostationary satellite.

Whereas conventional RDSS antennas are typically microstrip and dipole type antennas. The circular polarization synthesis of the microstrip antenna generally consists of a microstrip circuit of two linear polarization power dividers and a 90-degree phase shifter, and has the characteristics of small volume, light weight, higher integration level and low cost. The oscillator type antenna mainly utilizes the unit oscillator as a radiation unit of the feed source, so that the loss caused by a microstrip antenna medium is avoided, and the feed source efficiency is higher.

Both antennas, due to their limited volume (generally, they are

Left and right), the gain is not high (-3-5 dBi), side lobes and rear lobes are large, and the ship-borne ship-.

With the development of ocean fishery and transportation, in addition, the application range of the Beidou RDSS antenna is gradually expanded from offshore to middle and far seas. As mentioned above, limited by the low-gain antenna, the traditional beidou RDSS service area is limited to asia-pacific areas around china, and the north latitude 5-55 degrees and the east longitude 80-140 degrees cannot meet the requirement. If the antenna needs to be expanded to other peripheral sea areas such as europe, oceania and the like, the antenna gain is further increased, the antenna area is enlarged, an antenna servo system is used, and if the antenna is implemented independently, the complexity and the cost of the RDSS antenna are greatly increased. On the other hand, the traditional RDSS and VSAT systems can be used only by installing two antennas, so that the requirements on use sites and personnel are increased, the defects of high cost, large occupied area and the like exist, and the development requirement of the ship-borne communication technology with multiple systems and high integration level is not met.

With the development of microwave technology, especially the maturity of multi-frequency compound parabolic feed source design technology, it is possible to make broadband multi-frequency parabolic antenna covering VSAT (C, Ku, Ka) frequency band of RDSS (L, S frequency band) at the same time.

Disclosure of Invention

To address at least one of the above technical problems, the present disclosure provides an RDSS, VSAT compound parabolic antenna apparatus.

The RDSS and VSAT compound parabolic antenna device is realized by the following technical scheme.

The disclosed RDSS and VSAT composite parabolic antenna device is characterized by comprising: VSAT antenna feed source, RDSS antenna feed source and parabolic antenna; the parabolic antenna, the RDSS antenna feed source and the VSAT antenna feed source are sequentially superposed; the VSAT antenna feed source comprises a feed waveguide, a coaxial multi-ring choke coil, an auxiliary reflecting surface support and an auxiliary reflecting surface, wherein the feed waveguide, the coaxial multi-ring choke coil, the auxiliary reflecting surface support and the auxiliary reflecting surface are sequentially superposed; the feed waveguide tube transmits and radiates electromagnetic waves from the parabolic antenna, the sub-reflecting surface receives and reflects the electromagnetic waves radiated by the feed waveguide tube, and after the parabolic antenna reflects and focuses the electromagnetic waves reflected by the sub-reflecting surface, the feed waveguide tube secondarily radiates the electromagnetic waves reflected and focused by the parabolic antenna; the RDSS antenna feed source comprises an S-band spiral line, an S-band spiral line coaxial connector, a feed source mounting disc, an L-band spiral line coaxial connector and an L-band spiral line, wherein the S-band spiral line is arranged on a first side of the feed source mounting disc, the L-band spiral line is arranged on a second side, opposite to the first side, of the feed source mounting disc, the S-band spiral line is fixedly connected with the feed source mounting disc through the S-band spiral line coaxial connector, and the L-band spiral line is fixedly connected with the feed source mounting disc through the L-band spiral line coaxial connector; the RDSS antenna feed source transmits and radiates electromagnetic waves from the parabolic antenna, the sub-reflecting surface of the VSAT antenna feed source receives and reflects the electromagnetic waves radiated by the RDSS antenna feed source, and after the parabolic antenna reflects and focuses the electromagnetic waves reflected by the sub-reflecting surface, the RDSS antenna feed source secondarily radiates the electromagnetic waves reflected and focused by the parabolic antenna.

According to the RDSS, VSAT compound parabolic antenna apparatus according to at least one embodiment of the present disclosure, the coaxial multi-loop choke compensates for the radiation characteristic of the feed waveguide by introducing higher order modes.

According to the RDSS, VSAT compound parabolic antenna apparatus of at least one embodiment of the present disclosure, the coaxial multi-loop choke is capable of adjusting a radiation pattern angle of the feed waveguide.

According to the RDSS and VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the feed source installation plate is sleeved outside the feed waveguide tube.

According to the RDSS and VSAT compound parabolic antenna device of at least one embodiment of the disclosure, an outer conductor of an S-band spiral line coaxial connector of an RDSS antenna feed source is fixedly integrated with a feed source mounting disc, and an inner conductor of the S-band spiral line coaxial connector is connected with an S-band spiral line; s frequency channel helix coaxial connector, feed mounting disc and S frequency channel helix constitutes S frequency channel circular polarization helix antenna, will come from parabolic antenna 'S electromagnetic wave transmits and radiates, VSAT antenna feed the subreflector is received S frequency channel circular polarization helix antenna radiation' S electromagnetic wave reflects it, parabolic antenna is right after the electromagnetic wave that the subreflector reflects carries out the reflection focus, S frequency channel circular polarization helix antenna is to the warp parabolic antenna reflection focused electromagnetic wave carries out the secondary radiation.

According to the RDSS and VSAT compound parabolic antenna device of at least one embodiment of the disclosure, an outer conductor of an L-band spiral line coaxial connector of a RDSS antenna feed source is fixedly integrated with a feed source mounting disc, and an inner conductor of the L-band spiral line coaxial connector is connected with an L-band spiral line; l frequency channel helix coaxial connector the feed mounting disc and L frequency channel helix constitutes L frequency channel circular polarization helix antenna, will come from parabolic antenna's electromagnetic wave transmits and radiates, VSAT antenna feed the subreflector is received the electromagnetic wave of L frequency channel circular polarization helix antenna radiation reflects it, parabolic antenna is right after the electromagnetic wave of subreflector reflection carries out the reflection focus, L frequency channel circular polarization helix antenna is right the warp the electromagnetic wave of parabolic antenna reflection focus carries out the secondary radiation.

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

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

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

According to the RDSS and VSAT compound parabolic antenna device of at least one embodiment of the present disclosure, the S-band spiral line, the feed source mounting plate and the L-band spiral line are all made of conductive materials.

In accordance with at least one embodiment of the present disclosure, an RDSS, VSAT compound parabolic antenna assembly is provided, the parabolic antenna being made of a non-conductive material and having a surface coated with a conductive material.

In accordance with at least one embodiment of the present disclosure, an RDSS, VSAT compound parabolic antenna assembly, the parabolic antenna is made of an electrically conductive material.

Drawings

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

Fig. 1 is a schematic diagram of a RDSS and VSAT separated antenna structure in the prior art.

Figure 2 is a schematic diagram of an RDSS, VSAT compound parabolic antenna assembly according to one embodiment of the present disclosure.

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

Figure 4 is an exploded structural schematic diagram of an RDSS, VSAT compound parabolic antenna assembly according to one embodiment of the present disclosure.

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

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

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

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

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

Figure 10 is a Ku band emission pattern of an RDSS, VSAT compound parabolic antenna assembly (1.2 meters) according to one embodiment of the present disclosure.

Figure 11 is a Ku band reception pattern of an RDSS, VSAT compound parabolic antenna assembly (1.2 meters) according to one embodiment of the present disclosure.

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

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

Description of the reference numerals

100-RDSS and VSAT composite parabolic antenna device

10-parabolic antenna

20-VSAT antenna feed

21-feed waveguide

22-coaxial multi-ring choke

23-sub-reflecting surface

24-subreflector support

30-RDSS antenna feed

31-S frequency band spiral line

32-S frequency band spiral line coaxial connector

33-L frequency band spiral line

34-L frequency band spiral line coaxial connector

35-feed source mounting plate.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Accordingly, unless otherwise indicated, features of the various 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 shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.

When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements 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. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.

For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," below … …, "" below … …, "" below, "" above … …, "" above, "" … …, "" higher, "and" side (e.g., "in the sidewall") to describe one component's relationship to another (other) component as illustrated in the figures. 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 figures. 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 "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein 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", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising" and variations thereof are used in this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such, are used to interpret inherent deviations in measured values, calculated values, and/or provided values that would be recognized by one of ordinary skill in the art.

Fig. 1 is a schematic diagram of a RDSS and VSAT separated antenna structure in the prior art. Figure 2 is a schematic diagram of an RDSS, VSAT compound parabolic antenna assembly according to one embodiment of the present disclosure. Fig. 3 is a schematic diagram of the overall structure of an RDSS, VSAT compound parabolic antenna assembly according to one embodiment of the present disclosure. Figure 4 is an exploded structural schematic diagram of an RDSS, VSAT compound parabolic antenna assembly according to one embodiment of the present disclosure. Figure 5 is a side view of a schematic structural diagram of an RDSS, VSAT compound parabolic antenna assembly according to one embodiment of the present disclosure. Figure 6 is a perspective view of a structural schematic of an RDSS, VSAT compound parabolic antenna assembly according to one embodiment of the present disclosure. Figure 7 is a side view diagram of a structural schematic of an RDSS antenna feed of an RDSS, VSAT compound parabolic antenna assembly according to one embodiment of the present disclosure. Figure 8 is a perspective view of a schematic structural view of an RDSS antenna feed of an RDSS, VSAT compound parabolic antenna assembly according to one embodiment of the present disclosure.

The RDSS and VSAT compound parabolic antenna assembly of the present disclosure will be described in detail with reference to fig. 2 to 8.

As shown in fig. 2 to 8, the RDSS, VSAT compound parabolic antenna apparatus 100 includes: VSAT antenna feeds 20, RDSS antenna feeds 30, and parabolic antennas 10; the parabolic antenna 10, the RDSS antenna feed 30 and the VSAT antenna feed 20 are sequentially stacked; the VSAT antenna feed source 20 comprises a feed waveguide 21, a coaxial multi-ring choke 22, an auxiliary reflecting surface support 24 and an auxiliary reflecting surface 23, wherein the feed waveguide 21, the coaxial multi-ring choke 22, the auxiliary reflecting surface support 24 and the auxiliary reflecting surface 23 are sequentially superposed; RDSS antenna feed 30 includes S frequency channel helix 31, S frequency channel helix coaxial connector 32, feed mounting disc 35, L frequency channel helix coaxial connector 34 and L frequency channel helix 33, S frequency channel helix 31 sets up the first side at feed mounting disc 35, L frequency channel helix 33 sets up the second side relative with the first side at feed mounting disc 35, S frequency channel helix 31 passes through S frequency channel helix coaxial connector 32 and feed mounting disc 35 fixed connection, L frequency channel helix 33 passes through L frequency channel helix coaxial connector 34 and feed mounting disc 35 fixed connection.

The feed waveguide 21 transmits and radiates electromagnetic waves from the parabolic antenna 10, the sub-reflecting surface 23 receives and reflects the electromagnetic waves radiated by the feed waveguide 21, the parabolic antenna 10 reflects and focuses the electromagnetic waves reflected by the sub-reflecting surface 23, and the feed waveguide 21 secondarily radiates the electromagnetic waves reflected and focused by the parabolic antenna 10.

The RDSS antenna feed 30 transmits and radiates electromagnetic waves from the parabolic antenna 10, the sub-reflecting surface 23 of the VSAT antenna feed 20 receives and reflects the electromagnetic waves radiated by the RDSS antenna feed 30, and after the parabolic antenna 10 reflects and focuses the electromagnetic waves reflected by the sub-reflecting surface 23, the RDSS antenna feed 30 secondarily radiates the electromagnetic waves reflected and focused by the parabolic antenna 10.

The RDSS and VSAT compound parabolic antenna device greatly reduces the rear lobe and the side lobe of the RDSS antenna through the multiplexing paraboloid on the basis of not influencing the VSAT performance, can better realize the receiving and the transmitting of RDSS signals, and improves the performance and the integration level of the whole system.

The design of the subreflector 23 of the VSAT antenna and the multiplexed parabolic antenna 10 is required to meet the gain and side lobe requirements for the VSAT antenna.

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

The design of the multiplexing parabolic antenna 10 mainly considers antenna gain, side lobes and cross polarization, the aperture of the antenna is preferably 0.6-2.4 m, and the focal ratio is preferably 0.3-0.35. The curve of the subreflector 23 and the multiplexed parabolic antenna 10 is designed as a standard ring-focus antenna.

Preferably, the sub-reflecting surface 23 is an axisymmetric hyperboloid, the multiplexing paraboloid 10 is an axisymmetric off-focal paraboloid, and a ring focal point of the sub-reflecting surface 23 coincides with a ring focal point of the multiplexing paraboloid 10. Preferably, the phase center of the feeding waveguide 21 is placed at the other focal point position of the sub-reflecting surface 23.

The primary function of the sub-reflector support 24 is to ensure that the sub-reflector 23 is firmly supported and minimally sheltered from the parabolic reflector 10. The thickness is generally 0.08 to 0.15 lambda.

Preferably, the feeding circular waveguide 21 and the coaxial multiple loop choke 22 are used to satisfy the irradiation of the sub-reflecting surface 23 of the VSAT antenna.

The coaxial multi-ring choke coil 22 has at least two rings, i.e. a good choke effect, and preferably, the inner diameter of the two rings is selected to be 1.1-1.6 λ and 1.5-2.0 λ, and the height of the two rings is selected to be 0.4-0.6 λ, according to the working frequency. The thickness of the double ring is preferably 0.05-0.1 lambda.

The inner diameter of the circular feed waveguide 21 is determined by the operating frequency and cross polarization requirements of the VSAT antenna, and is preferably 0.8-1.2 λ. The half-aperture angle of the sub-reflecting surface 23 to the circular feed waveguide 21 is preferably 55 ° to 65 °.

The VSAT antenna feed source 20 is preferably within a 60-degree half aperture angle so as to meet the irradiation requirement of the multiplexing parabolic antenna 10 and the secondary reflecting surface 23 within a focusing ratio of 0.3-0.35.

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

According to the preferred embodiment of the present disclosure, the coaxial multi-loop choke 22 of the RDSS, VSAT compound parabolic antenna device enables adjustment of the radiation pattern angle of the feed waveguide 21.

In the above embodiment, the coaxial multi-loop choke 22 compensates the radiation characteristic of the feed waveguide 21 by introducing a higher-order mode, so that the entire feed source is axisymmetric in a broadband range. In addition, the angles of the radiation patterns of the feed waveguides 21 are adjusted to adapt to paraboloids with different focal ratio.

It can be seen that, in addition to the VSAT ring focus antenna feed 20 of the present disclosure having a good radiation pattern in a broadband range for matching with a parabolic antenna, the feed pattern also has good axial symmetry, which improves the polarization discrimination of the antenna.

According to the preferred embodiment of the present disclosure, the feed mounting plate 35 of the RDSS, VSAT compound parabolic antenna assembly is sleeved outside the feed waveguide 21.

The outer conductor of an S-band spiral line coaxial connector 32 of the RDSS antenna feed source 30 is fixedly integrated with a feed source mounting disc 35, and the inner conductor of the S-band spiral line coaxial connector 32 is connected with an S-band spiral line 31; the S-band helical coaxial connector 32, the feed source mounting disc 35, and the S-band helical line 31 constitute an S-band circularly polarized helical antenna, which transmits and radiates electromagnetic waves from the parabolic antenna 10, the sub-reflecting surface 23 of the VSAT antenna feed source 20 receives and reflects the electromagnetic waves radiated by the S-band circularly polarized helical antenna, and after the parabolic antenna 10 reflects and focuses the electromagnetic waves reflected by the sub-reflecting surface 23, the S-band circularly polarized helical antenna performs secondary radiation on the electromagnetic waves reflected and focused by the parabolic antenna 10.

According to the 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 compound parabolic antenna device is fastened to the feed mounting plate 35 into a whole, and the inner conductor of the L-band helical coaxial connector 34 is connected to the L-band helical line 33; l frequency channel helix coaxial connector 34, feed mounting disc 35 and L frequency channel helix 33 constitute L frequency channel circular polarization helix antenna, the electromagnetic wave from parabolic antenna 10 is transmitted and radiated, the electromagnetic wave of L frequency channel circular polarization helix antenna radiation is received and is reflected to sub-reflecting surface 23 of VSAT antenna feed 20, parabolic antenna 10 carries out the reflection focus to the electromagnetic wave that sub-reflecting surface 23 reflects the back, L frequency channel circular polarization helix antenna carries out the secondary radiation to the electromagnetic wave through parabolic antenna 10 reflection focus.

Illustratively, the RDSS dual circularly polarized antenna feed 30 includes a top S-band circularly polarized antenna 31 and a bottom L-band feed-forward 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 mounting 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 focus of the parabolic surface 10.

The L-band circularly polarized antenna 33 is a helical antenna, and the helical top of the L-band helical line 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 influence on the performance of the VSAT antenna, the feed of the RDSS antenna should be as close as possible to the focus of the multiplexing parabolic antenna 10 on the basis of not shielding the VSAT feed from the multiplexing parabolic antenna 10.

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

For example, the axial ratio is less than 1.5dB, the standing-wave ratio is less than 1.5, and the spiral diameter and the thread pitch of the spiral antenna are selected to ensure that the axial ratio and the standing-wave ratio of the feed source in the working frequency range are comprehensively optimal. The preferred screw diameter is 1.2 lambda-1.5 lambda, and the preferred screw pitch is 0.9-1.1 lambda, designs according to this scope, and helical antenna can reach the level that axial ratio is less than 2.0dB, and standing wave ratio is less than 1.5.

Preferably, the feeding waveguide, the coaxial multi-ring choke, 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 22, the sub-reflector 23 and the sub-reflector holder 24 of the RDSS and VSAT compound parabolic antenna device of the present disclosure are made of non-conductive material, and the surfaces thereof are coated with conductive material.

Preferably, the feed waveguide 21, the coaxial multi-loop choke 22, the sub-reflector 23 and the sub-reflector holder 24 of the RDSS and VSAT compound parabolic antenna device of the present disclosure are made of conductive materials.

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

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

Specific parameters and technical effects of the dual-band dual-circular polarization navigation measurement and control antenna feed provided by the present disclosure are described in detail in a specific preferred embodiment with reference to fig. 9 to 13. It should be noted that the selected examples are only for illustrating the present disclosure, and do not limit the scope of the present disclosure.

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

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

The RDSS feed source works at 1.61568GHz (L frequency band) and 2.49175GHz (S frequency band) respectively, the spiral diameter of the spiral line 31 of the S frequency band is 38mm, the thread pitch is 30mm, the number of spiral turns is 1.5, the spiral diameter of the spiral line 33 of the L frequency band is 58mm, the thread pitch is 32mm, and the number of spiral turns is 1.5.

For 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 the shielding, the outer diameter of the feed source mounting disc 35 is 66mm, and the thickness is 2 mm.

The parabolic antenna 10 matched with the feed source is a metal ring focal paraboloid with the caliber of 1.2m and the focal ratio of 0.3. Under the condition of matching with the feed source, the simulated directional diagram of the antenna is shown in fig. 10 to 13 (in fig. 10, 11, 12 and 13, the solid line part is a horizontal directional diagram, the dotted line is a pitch directional diagram, the abscissa is an angle, the unit is degrees, the ordinate is gain, and the unit is dB). The gain of the Ku transmitting frequency band is larger than 42.9dBi, the gain of the receiving frequency band is larger than 41.0dBi, the gain of the S frequency band is larger than 19.9dBi, the gain of the L frequency band is larger than 21.4dBi, the efficiency of the antenna in the VSAT frequency band is larger than 60%, and the efficiency of the S frequency band and the efficiency of the L frequency band are both larger than 50%. The other antenna parameters are that the full-band standing wave is less than 1.5, the axial ratio is less than 1.0dB at the S frequency band, and the L frequency band is less than 1.5 dB. And the polarization discrimination rate of the Ku frequency band is more than 35 dB.

The 1.2 meter RDSS, VSAT compound parabolic antenna assembly has good radiation efficiency, pattern and polarization discrimination in the VSAT frequency range. The RDSS feed source signals are focused and amplified through the multiplexing parabolic antenna in the RDSS frequency band, antenna gain is increased, matching bandwidth and radiation efficiency of the antenna are guaranteed, and the low-loss and high-integration RDSS and VSAT composite parabolic antenna is formed.

The RDSS antenna and the VSAT paraboloid are combined, through the utilization of the paraboloid focusing characteristic of the VSAT antenna, on the basis of not influencing the performance of the VSAT antenna, the RDSS feed source signal is subjected to focusing amplification through the multiplexing paraboloid antenna, the gain of the RDSS antenna is improved to be more than 15dB of the existing antenna, the application range of the RDSS is expanded from offshore to middle and far seas, and meanwhile, the overall integration level of the shipborne communication system is improved.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to be 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/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

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

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims

1. An RDSS, VSAT compound parabolic antenna assembly, comprising:

VSAT antenna feed source, RDSS antenna feed source and parabolic antenna;

the parabolic antenna, the RDSS antenna feed source and the VSAT antenna feed source are sequentially superposed;

the VSAT antenna feed source comprises a feed waveguide, a coaxial multi-ring choke coil, an auxiliary reflecting surface support and an auxiliary reflecting surface, wherein the feed waveguide, the coaxial multi-ring choke coil, the auxiliary reflecting surface support and the auxiliary reflecting surface are sequentially superposed;

the feed waveguide tube transmits and radiates electromagnetic waves from the parabolic antenna, the sub-reflecting surface receives and reflects the electromagnetic waves radiated by the feed waveguide tube, and after the parabolic antenna reflects and focuses the electromagnetic waves reflected by the sub-reflecting surface, the feed waveguide tube secondarily radiates the electromagnetic waves reflected and focused by the parabolic antenna;

the RDSS antenna feed source comprises an S-band spiral line, an S-band spiral line coaxial connector, a feed source mounting disc, an L-band spiral line coaxial connector and an L-band spiral line, wherein the S-band spiral line is arranged on a first side of the feed source mounting disc, the L-band spiral line is arranged on a second side, opposite to the first side, of the feed source mounting disc, the S-band spiral line is fixedly connected with the feed source mounting disc through the S-band spiral line coaxial connector, and the L-band spiral line is fixedly connected with the feed source mounting disc through the L-band spiral line coaxial connector;

the RDSS antenna feed source transmits and radiates electromagnetic waves from the parabolic antenna, the sub-reflecting surface of the VSAT antenna feed source receives and reflects the electromagnetic waves radiated by the RDSS antenna feed source, and after the parabolic antenna reflects and focuses the electromagnetic waves reflected by the sub-reflecting surface, the RDSS antenna feed source secondarily radiates the electromagnetic waves reflected and focused by the parabolic antenna.

2. The RDSS, VSAT compound parabolic antenna assembly of claim 1, wherein the coaxial multi-loop choke compensates for radiation characteristics of the feed waveguide by introducing higher order modes.

3. The RDSS, VSAT compound parabolic antenna assembly of claim 1, wherein the coaxial multi-loop choke is capable of adjusting a radiation pattern angle of the feed waveguide.

4. The RDSS, VSAT compound parabolic antenna assembly of any one of claims 1 to 3, wherein the feed mounting disk is sleeved outside the feed waveguide.

5. The RDSS, VSAT compound parabolic antenna assembly according to any one of claims 1 to 3, wherein the feed waveguide, the coaxial multi-loop choke, the sub-reflector, and the sub-reflector holder are all made of non-conductive material and have surfaces coated with conductive material.

6. The RDSS, VSAT compound parabolic antenna assembly of any one of claims 1 to 3, wherein the feed waveguide, the coaxial multi-loop choke, the sub-reflector, and the sub-reflector holder are made of electrically conductive material.

7. The RDSS, VSAT compound parabolic antenna assembly of 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 a non-conductive material and have surfaces coated with a conductive material.

8. The RDSS, VSAT compound parabolic antenna assembly of any one of claims 1 to 3, wherein the S-band helix, the feed mounting plate, and the L-band helix are made of electrically conductive material.

9. The RDSS, VSAT compound parabolic antenna assembly of any one of claims 1 to 3, wherein the parabolic antenna is made of a non-conductive material and has a surface coated with a conductive material.

10. The RDSS, VSAT compound parabolic antenna assembly of any one of claims 1 to 3, wherein the parabolic antenna is made of an electrically conductive material.