A large angle of illumination LC dual-frequency dielectric feed network

Abstract

The application discloses a large-illumination-angle LC dual-frequency dielectric feed network and belongs to the technical field of satellite communication microwave antennas; the network comprises a shaped metal outer wall, a shaped dielectric rod, four dielectric-wrapped coaxial probes, four coaxial probes, an L-frequency polarization synthesis network and a C-frequency polarization synthesis network; the shaped dielectric rod is used for transmitting L-frequency and C-frequency receiving signals along an axial direction thereof, the four coaxial probes are symmetrically distributed along the axial direction of the dielectric rod at an angle of 90 degrees, one end of each coaxial probe is inserted into the shaped metal wall, and the other end of each coaxial probe is connected with the L-frequency polarization synthesis network through a cable to output two L-frequency circularly-polarized signals, and the four dielectric-wrapped coaxial probes are symmetrically distributed along the axial direction of the dielectric rod at an angle of 90 degrees, one end of each dielectric-wrapped coaxial probe is inserted into the shaped dielectric rod, and the other end of each dielectric-wrapped coaxial probe is connected with the C-frequency polarization synthesis network through a cable to output two C-frequency circularly-polarized signals; the network has small volume and light weight, does not need to be debugged, can save a large amount of labor cost and is suitable for engineering promotion.

Description

TECHNICAL FIELD

[0001] The application discloses a large-illumination-angle LC dual-frequency dielectric feed network, relates to the technical field of satellite communication microwave antennas, and is suitable for L-band and C-band signal reception of fixed station and mobile station antennas. BACKGROUND

[0002] Satellite communication has many advantages such as wide coverage, flexible networking, and no geographical limitation, and is widely applied in military and civilian fields. As an emergency communication means for disaster prevention, disaster relief and handling of emergencies, satellite communication has great potential. L-band and C-band antennas have been widely used in various important fields such as broadcast television, civil aviation and emergency communication. The LC dual-frequency feed network is a core device of the antenna, and the performance of the antenna is largely dependent on the performance of the feed network. However, due to the low frequency of the L-band and C-band, the traditional feed network is large in size and cannot be applied to 2.3m aperture antennas, and the use scene is limited. SUMMARY

[0003] The application aims to avoid the shortcomings in the background art, and provides an LC dual-frequency dielectric feed which is simple in structure and easy to process. The application comprises a shaped metal outer wall, a shaped dielectric rod, a dielectric-wrapped coaxial probe, a mushroom-shaped coaxial probe, an L-band polarization synthesis network, a C-band polarization synthesis network and a connecting cable. The compact LC dual-frequency dielectric feed network is simple in structure, free of debugging, low in cost, easy to process, can meet the signal reception in the L-band (1.67GHz-1.71GHz) and the C-band (3.625GHz-4.2GHz), and has a large-illumination-angle feed pattern and can be used for front-fed antenna illumination. The application also has the characteristics of compact structure, small size, light weight, easy operation, low processing cost and the like, and can be installed on an antenna with a diameter of 2.3m or more, and has a wide application range.

[0004] The application is achieved in the following manner:

[0005] A large-illumination-angle LC dual-frequency dielectric feed network comprises a shaped metal outer wall, a shaped dielectric rod, four dielectric-wrapped coaxial probes, four mushroom-shaped coaxial probes, an L-band polarization synthesis network and a C-band polarization synthesis network.

[0006] The shaped metal outer wall is of a stepped structure and comprises a necked portion, an intermediate portion and an expanded portion which are sequentially connected; the shaped dielectric rod is located in the shaped metal outer wall, and the central axes of the shaped dielectric rod and the shaped metal outer wall coincide.

[0007] The L-band polarization synthesis network and the C-band polarization synthesis network are respectively sleeved on the middle part outer surface and the necking part outer surface of the shaped metal outer wall; four mushroom type coaxial probes are distributed in 90 degrees axial symmetry along the middle part outer surface of the shaped metal outer wall, one end of the mushroom type coaxial probes is inserted into the shaped metal outer wall, and the other end is connected with the L-band polarization synthesis network through a cable; four dielectric wrapped coaxial probes are distributed in 90 degrees axial symmetry along the necking part outer surface of the shaped metal outer wall, one end of the dielectric wrapped coaxial probes is inserted into the shaped dielectric rod through the shaped metal outer wall, and the other end is connected with the C-band polarization synthesis network through a cable.

[0008] Further, the shape of the shaped dielectric rod is fitted by using a least square method, the diameter of the feed radiation port is reduced, and the feed radiation pattern has a large illumination angle.

[0009] Further, the part of the shaped metal outer wall wrapping the shaped dielectric rod provides support for the shaped dielectric rod, the dielectric wrapped coaxial probe and the mushroom type coaxial probe.

[0010] Further, the flange outside of the mushroom type coaxial probe is an N-50K connector, the flange inside sequentially comprises a metal rod and a metal mushroom head connected to the end of the metal rod, and the metal rod and the metal mushroom head are connected through threads.

[0011] Further, the flange outside of the dielectric wrapped coaxial probe is an N-50K connector, and the flange inside comprises a metal cylinder and a dielectric material used for wrapping the metal cylinder, and the dielectric material wraps the part of the metal cylinder close to the flange.

[0012] Compared with the background art, the present application has the following advantages:

[0013] 1. The present application uses the shaped dielectric rod to transmit C-band signals, and the standing wave and the radiation pattern of the C-band feed network can be adjusted by changing the shape of the dielectric rod, thereby controlling the performance of the antenna.

[0014] 2. The present application uses the shaped metal outer wall to transmit L-band signals, and the radiation pattern of the L-band feed network can be adjusted by changing the shape of the metal outer wall, thereby controlling the performance of the antenna.

[0015] 3. The present application uses the mushroom type coaxial probe to excite L-band signals, and the standing wave of the L-band feed network can be adjusted by changing the shape of the mushroom type probe, and the mushroom type coaxial probe simultaneously serves as a connection device of the feed and the L-band polarization synthesis network, and the structure is simple and easy to process.

[0016] 4. The present application uses the dielectric wrapped coaxial probe as a connection device of the feed and the C-band polarization synthesis network, and the structure is simple and easy to process.

[0017] 5. The L-band polarization combining network in microstrip form has simple structure and small size, is connected with the feed source through a cable, and the position of the combining network can be freely controlled by adjusting the length of the cable.

[0018] 6. The C-band polarization combining network in microstrip form has simple structure and small size, is connected with the feed source through a cable, and the position of the combining network can be freely controlled by adjusting the length of the cable.

[0019] 7. The L-band and C-band feed network radiation patterns can be adjusted by changing the shape of the shaped metal outer wall.

[0020] 8. The present application has small size and light weight, does not need to be debugged, can save a large amount of labor cost, quickly realizes the assembly of the LC dual-frequency feed network system, and is suitable for mass production. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the present application.

[0022] Figure 2 is a schematic diagram of the shaped metal outer wall.

[0023] Figure 3

[0024] Figure 4 is a schematic diagram of the medium-wrapped coaxial probe.

[0025] Figure 5 is a schematic diagram of the mushroom-shaped coaxial probe.

[0026] Figure 6 is a principle block diagram of the L / C-band polarization combining network.

[0027] The shaped metal outer wall is 1, the shaped medium rod is 2, the medium-wrapped coaxial probe is 3, the mushroom-shaped coaxial probe is 4, the L-band polarization combining network is 5, and the C-band polarization combining network is 6. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be further described in detail below with reference to the drawings.

[0029] ​A large angle of illumination LC dual-frequency dielectric feed network, comprising a shaped metal outer wall, a shaped dielectric rod, four dielectric-wrapped coaxial probes, four mushroom-shaped coaxial probes, an L-band polarization synthesis network, and a C-band polarization synthesis network. L-band receiving signals transmit energy along the axis of the shaped metal outer wall, the four mushroom-shaped coaxial probes are symmetrically distributed at 90° along the axis of the dielectric rod, one end of each of the four mushroom-shaped coaxial probes is inserted into the shaped metal outer wall, and the other end of each of the four mushroom-shaped coaxial probes is connected to the L-band polarization synthesis network through a cable to output two L-band circularly polarized signals. C-band receiving signals transmit energy along the axis of the shaped dielectric rod, the four dielectric-wrapped coaxial probes are symmetrically distributed at 90° along the axis of the dielectric rod, one end of each of the four dielectric-wrapped coaxial probes is inserted into the shaped dielectric rod, and the other end of each of the four dielectric-wrapped coaxial probes is connected to the C-band polarization synthesis network through a cable to output two C-band circularly polarized signals. The shaped metal outer wall partially wraps the shaped dielectric rod to provide support for the shaped dielectric rod, the dielectric-wrapped coaxial probes, and the mushroom-shaped coaxial probes, and can adjust the feed network pattern.

[0030] The shaped metal outer wall is step-shaped, partially wraps the shaped dielectric rod, serves as support for the shaped dielectric rod, can adjust the L-band feed network pattern, and has eight circular openings. Four of the circular openings are symmetrically distributed at 90° along the axis and are used for inserting the mushroom-shaped coaxial probes, and have connecting flanges for the mushroom-shaped coaxial probes. Four of the circular openings are symmetrically distributed at 90° along the axis and are used for inserting the dielectric-wrapped coaxial probes, and have connecting flanges for the dielectric-wrapped coaxial probes.

[0031] The shaped dielectric rod is fitted using the least squares method, has four cylindrical recesses at one end, and is symmetrically distributed at 90° around the axis of the dielectric rod, and is connected to the dielectric-wrapped coaxial probes. The shaped dielectric rod is reduced in diameter at the feed port to make the feed network radiation pattern have a large angle of illumination. The dielectric-wrapped coaxial probe flange has an N-50K connector above the flange, and below the flange includes a metal cylinder and a dielectric material wrapped around the metal cylinder, one end of the dielectric-wrapped coaxial probe is inserted into the shaped dielectric rod, and the other end of the dielectric-wrapped coaxial probe is connected to the C-band polarization synthesis network through a cable.

[0032] Further, the mushroom-shaped coaxial probe has an N-50K connector above the flange, and below the flange includes a metal rod and a metal mushroom head, the metal rod and the metal mushroom head are connected by threads, one end of the mushroom-shaped coaxial probe is inserted into the shaped metal outer wall, and the other end of the mushroom-shaped coaxial probe is connected to the L-band polarization synthesis network through a cable.

[0033] The L-band polarization synthesis network is connected to the mushroom-shaped coaxial probes by four cables, has two output ports, uses a microstrip circuit design method inside, and realizes the output of left-handed and right-handed signals through 180-degree bridges, 90-degree bridges, and loads. The L-band polarization synthesis network is designed to have a special shape to closely connect with the shaped metal outer wall, thereby reducing the size of the feed network system.

[0034] The C-band polarization synthesis network is connected with the dielectrically-coated coaxial probe by four cables, and outputs two ports. The internal microstrip circuit design method is adopted to realize the output of left-handed and right-handed signals through 180-degree bridge, 90-degree bridge and load. The C-band polarization synthesis network is designed in a special shape, which can be closely connected with the shaped metal outer wall to reduce the volume of the feed network system.

[0035] The cable is used for the connection between the dielectrically-coated coaxial probe and the C-band polarization synthesis network, and the connection between the mushroom-shaped coaxial probe and the L-band polarization synthesis network.

[0036] The large-illumination-angle LC dual-frequency dielectric feed network transmits C-band signals by using a shaped dielectric rod and a dielectrically-coated coaxial probe, and integrates a C-band polarization synthesis network. The L-band signals are transmitted by using a shaped metal outer wall and a mushroom-shaped coaxial probe, and the L-band polarization synthesis network is integrated. The structure is compact, and the feed network system can be installed in a small-diameter antenna. The shaped metal outer wall is designed in a stepped shape, so that the L-band feed radiation pattern has a large illumination angle and can be used for illumination of a front-fed antenna. The diameter of the shaped dielectric rod is reduced at the outlet of the feed, so that the C-band feed radiation pattern has a large illumination angle and can be used for illumination of a front-fed antenna. The feed network system has a small volume and light weight, does not need to be adjusted, can save a large amount of labor cost, and is suitable for engineering promotion.

[0037] Specifically, as shown in the Figure 1 large-illumination-angle LC dual-frequency dielectric feed network, the large-illumination-angle LC dual-frequency dielectric feed network includes a shaped metal outer wall, a shaped dielectric rod, four dielectrically-coated coaxial probes, four mushroom-shaped coaxial probes, an L-band polarization synthesis network, and a C-band polarization synthesis network. As shown in the Figure 2 shaped dielectric rod, the curved shape is obtained by least square fitting. One end has four cylindrical recesses, which are distributed in 90° around the axis of the dielectric rod, are connected with the dielectrically-coated coaxial probes, and the diameter of the shaped dielectric rod is reduced at the outlet of the feed, so that the feed radiation pattern has a large illumination angle. The shaped dielectric rod is a key device for ensuring the C-band feed standing wave and the radiation pattern.

[0038] Further, as shown in the Figure 3 shaped metal outer wall, the shaped metal outer wall is designed in a stepped shape, partially wraps the shaped dielectric rod, serves as a support for the shaped dielectric rod, can adjust the L-band feed pattern, and has eight circular openings. Four circular openings are distributed in 90° along the axial direction, are used for inserting the mushroom-shaped coaxial probes, and have connecting flanges with the mushroom-shaped coaxial probes. Four circular openings are distributed in 90° along the axial direction, are used for inserting the dielectrically-coated coaxial probes, and have connecting flanges with the dielectrically-coated coaxial probes.

[0039] Further, as shown in the Figure 4The shown is a medium wrapped coaxial probe, the probe flange above is N-50K joint, the flange below contains metal cylinder and medium material wrapped metal cylinder, one end is inserted into the shaped medium rod, and the other end is connected with C-band polarization synthesis network through cable. Further, as shown in Figure 5 The shown is a mushroom type coaxial probe, the probe flange above is N-50K joint, the flange below contains metal rod and metal mushroom head, the metal rod and the metal mushroom head are connected through thread, one end is inserted into the shaped metal outer wall, and the other end is connected with L-band polarization synthesis network through cable.

[0040] Further, as shown in Figure 6 The shown is a principle block diagram of L / C-band polarization synthesis network. Four input ports and two output ports are adopted, microstrip circuit design method is used inside, left-handed and right-handed signal output is realized through 180-degree bridge, 90-degree bridge and load. The polarization synthesis network shape is designed as special shape, which can be closely connected with the shaped metal outer wall, and the volume of the feed network system is reduced.

[0041] In summary, the large illumination angle LC dual-band medium feed network includes a shaped metal outer wall, a shaped medium rod, four medium wrapped coaxial probes, four mushroom type coaxial probes, an L-band polarization synthesis network and a C-band polarization synthesis network. The feed network system realizes the reception of LC dual-band dual-circular polarization signal. The present application has the advantages of compact structure, easy processing, excellent electrical performance and the like, and can meet the needs of L-band and C-band fixed station and mobile station antennas.

[0042] It should be noted that the above description and cases are helpful for those skilled in the art to understand the present application, but do not limit the protection scope of the present application. Any modification, scaling, modification and / or deletion of various modifications, simplification and / or implementation without departing from the essential content of the present application shall fall within the protection scope of the present application.

Claims

1. A large illumination angle LC dual-frequency dielectric feed network, characterized in that, It includes a shaped metal outer wall, a shaped dielectric rod, four dielectric-encapsulated coaxial probes, four mushroom-shaped coaxial probes, an L-band polarization synthesis network, and a C-band polarization synthesis network; The outer wall of the shaping metal has a symmetrical stepped structure, including a constricted section, a middle section, and a flared section connected in sequence; the shaping medium rod is located in the outer wall of the shaping metal, and the central axes of the two coincide. The L-band polarization synthesis network and the C-band polarization synthesis network are respectively fitted onto the outer surface of the middle part and the outer surface of the constricted part of the shaped metal outer wall; four mushroom-shaped coaxial probes are symmetrically distributed at 90° along the axial direction of the outer surface of the middle part of the shaped metal outer wall, with one end inserted into the shaped metal outer wall and the other end connected to the L-band polarization synthesis network through a cable; four dielectric-encapsulated coaxial probes are symmetrically distributed at 90° along the axial direction of the outer surface of the constricted part of the shaped metal outer wall, with one end inserted through the shaped metal outer wall into the shaped dielectric rod and the other end connected to the C-band polarization synthesis network through a cable; The shape of the shaping dielectric rod is fitted using the least squares method, which reduces the diameter of the feed radiation port, thereby giving the feed radiation pattern a large illumination angle. The partially encapsulated shaping medium rod on the outer wall of the shaping metal provides support for the shaping medium rod, the medium-encapsulated coaxial probe, and the mushroom-shaped coaxial probe.

2. The large illumination angle LC dual-frequency dielectric feed network according to claim 1, characterized in that, The outer side of the flange of the mushroom-shaped coaxial probe is an N-50K connector, and the inner side of the flange contains a metal rod and a metal mushroom head connected to the end of the metal rod. The metal rod and the metal mushroom head are connected by threads.

3. The large illumination angle LC dual-frequency dielectric feed network according to claim 1, characterized in that, The outer side of the flange of the coaxial probe containing the medium is an N-50K connector, and the inner side of the flange contains a metal cylinder and a medium material for wrapping the metal cylinder. The medium material wraps the part of the metal cylinder near the flange.

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