A compact large-angle-of-illumination C-band dielectric feed network structure

Abstract

The application discloses a compact C-band medium feed network with a large illumination angle, and belongs to the field of satellite communication microwave antennas. The compact C-band medium feed network with a large illumination angle comprises a shaped metal outer wall, a shaped medium rod, four medium-wrapped coaxial probes and a polarization synthesis network. The C-band receiving signal is transmitted along the axial direction of the shaped medium rod, the four medium-wrapped coaxial probes are symmetrically distributed at an angle of 90 degrees along the axial direction of the shaped medium rod, one end of each medium-wrapped coaxial probe is inserted into the shaped medium rod, and the other end of each medium-wrapped coaxial probe is connected to the polarization synthesis network through a cable. The polarization synthesis network outputs two C-band circularly-polarized signals. The shaped metal outer wall partially wraps the shaped medium rod, thereby providing support for the shaped medium rod and the medium-wrapped coaxial probes. The compact C-band medium feed network with a large illumination angle integrates the polarization synthesis network, has a compact structure and can be installed on a small-diameter antenna. The feed network system is small in size, light in 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] This invention discloses a compact, large illumination angle C-band dielectric feed network, which relates to the field of satellite communication microwave antenna technology and is suitable for C-band signal reception of fixed station and mobile station antennas. Background Technology

[0002] Satellite communication boasts numerous advantages, including wide coverage, flexible networking, and lack of geographical limitations, leading to its widespread application in both military and civilian fields. As an emergency communication method for disaster prevention, relief, and handling emergencies, satellite communication holds significant promise. C-band antennas have long been widely used in various important fields such as broadcasting, civil aviation, and emergency communications. The C-band feed network is the core component of the antenna, and its performance largely depends on the performance of the antenna itself. However, due to the low frequency of the C-band, traditional feed networks are bulky and cannot be used with 2.3m aperture antennas, limiting their application scenarios. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a C-band dielectric feed that is simple in structure and easy to manufacture. This invention is simple in structure, requires no debugging, is low in cost, and easy to manufacture. It can meet the requirements for C-band signal reception (3.625GHz-4.2GHz), and the feed pattern has a large illumination angle, making it suitable for front-feed antenna illumination. This invention also features a compact structure, small size, light weight, convenient operation, and low manufacturing cost. It can be installed on antennas with a diameter of 2.3m or larger, and has a wide range of applications.

[0004] The objective of this invention is achieved as follows:

[0005] A compact, large illumination angle C-band dielectric feed network includes a shaped metal outer wall, a shaped dielectric rod, four dielectric-wrapped coaxial probes, and a polarization synthesis network.

[0006] The polarization synthesis network is sleeved on the outer surface of the shaped metal outer wall. One end of the shaped metal rod is fixed to the constricted end of the shaped metal outer wall, and the other end extends along the central axis of the shaped metal outer wall and protrudes at the flared end.

[0007] The four medium-encapsulated coaxial probes are symmetrically distributed at 90° along the axial direction of the shaping metal rod. One end of each probe passes through the outer wall of the shaping metal and is inserted into the shaping medium rod, while the other end is connected to the polarization synthesis network via a cable.

[0008] Furthermore, the constricted end of the shaped metal outer wall wraps around the shaped medium rod, providing support for the shaped medium rod and the medium-wrapped coaxial probe.

[0009] Furthermore, the shape of the shaping dielectric rod is fitted using the least squares method, and the diameter of the feed radiation aperture is reduced, so that the feed radiation pattern has a large illumination angle.

[0010] Furthermore, the shape of the shaped metal outer wall is fitted using the least squares method.

[0011] Furthermore, the outer side of the flange of the medium-encapsulated coaxial probe is an N-50K connector, and the inner side of the flange contains a metal cylinder and a dielectric material encapsulating the metal cylinder. One end is inserted into a shaping dielectric rod, and the other end is connected to a polarization synthesis network via a cable.

[0012] Compared with the prior art, the present invention has the following advantages:

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

[0014] 2. The present invention uses a dielectric-encapsulated coaxial probe as a connection device between the feed source and the polarization synthesis network, which has a simple structure and is easy to process.

[0015] 3. A microstrip polarization synthesis network is adopted, which has a simple structure and small size. It is connected to the feed source by a cable, and the placement of the synthesis network can be freely controlled by adjusting the cable length.

[0016] 4. The shaped metal outer wall of this invention can be used to support the shaped dielectric rod, and the radiation pattern of the feed network can be adjusted by changing its shape.

[0017] 5. This invention is small in size and light in weight, requires no debugging, can save a lot of manpower costs, and can quickly realize the assembly of C-band feed network system, making it suitable for mass production. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the shaping medium rod described in this invention.

[0020] Figure 3 This is a schematic diagram of the medium-encapsulated coaxial probe described in this invention.

[0021] Figure 4 This is a schematic diagram of the external shape of the polarization synthesis network of the present invention.

[0022] Figure 5 This is a schematic diagram of the principle of the polarization synthesis network of this invention.

[0023] Figure labeling: 1. Shaped metal outer wall; 2. Shaped dielectric rod; 3. Dielectric-encapsulated coaxial probe; 4. Polarized synthesis network. Detailed Implementation

[0024] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] A compact, large-angle C-band dielectric feed network includes a shaped metal outer wall, a shaped dielectric rod, four dielectric-wrapped coaxial probes, and a polarization combining network. The C-band received signal transmits energy backward along the axial direction of the shaped dielectric rod. The four dielectric-wrapped coaxial probes are symmetrically distributed at 90° along the axial direction of the dielectric rod, with one end inserted into the dielectric rod and the other end connected to the polarization combining network via a cable. The polarization combining network outputs two C-band circularly polarized signals. The shaped metal outer wall partially wraps around the dielectric rod, providing support for the dielectric rod and the dielectric-wrapped coaxial probes, and allowing adjustment of the feed pattern.

[0026] The outer wall curve of the shaped metal is a least squares fitting curve, which partially wraps the shaped medium rod as a support for the shaped medium rod and can adjust the feed direction pattern. There are four circular openings at the bottom, symmetrically distributed at 90° along the axial direction, for inserting the medium-wrapped coaxial probe, and there is a connecting flange for the coaxial probe.

[0027] The shape of the shaping medium rod is fitted using the least squares method. It has four cylindrical pits at one end, which are symmetrically distributed at 90° around the axis of the medium rod and connected to the coaxial probe wrapped by the medium. The diameter of the shaping medium rod is reduced at the feed port, so that the feed radiation pattern has a large illumination angle.

[0028] The above the coaxial probe flange of the medium-encapsulated probe is an N-50K connector, and the area below the flange contains a metal cylinder and a medium material encapsulating the metal cylinder. One end is inserted into a shaping medium rod, and the other end is connected to a polarization synthesis network via a cable.

[0029] The polarization combining network consists of four cables connected to a dielectric-coated coaxial probe, outputting two ports. Internally, it employs a microstrip circuit design, using a 180-degree bridge, a 90-degree bridge, and a load to achieve left-hand and right-hand rotary signal output. The polarization combining network has an irregular shape, allowing for tight integration with the shaped metal outer wall, thus reducing the size of the feed network system.

[0030] The cable is used for the connection between the dielectric-wrapped coaxial probe and the polarization synthesis network.

[0031] This compact, large-angle-of-illumination C-band dielectric feed network uses shaped dielectric rods and dielectric-wrapped coaxial probes to transmit C-band signals. It integrates a polarization synthesis network, resulting in a compact structure suitable for installation on smaller aperture antennas. The diameter of the shaped dielectric rod decreases at the feed outlet, giving the feed radiation pattern a large illumination angle, making it suitable for front-feed antenna illumination. This feed network system is small in size, lightweight, requires no debugging, saves significant labor costs, and is suitable for widespread engineering application.

[0032] Specifically, such as Figure 1 As shown, this compact, large-angle C-band dielectric feed network includes a shaped metal outer wall, a shaped dielectric rod, four dielectric-wrapped coaxial probes, and a polarization synthesis network. Figure 2 The image shows a shaped dielectric rod. Its curved shape was obtained by least-squares fitting. One end has four cylindrical recesses symmetrically distributed at 90° around the rod's axis, connecting to a coaxial probe encased in dielectric material. The diameter of the shaped dielectric rod decreases at the feed port, resulting in a large illumination angle for the feed radiation pattern. The shaped dielectric rod is a key component in ensuring the feed standing wave and radiation pattern.

[0033] Furthermore, such as Figure 3 The image shows a medium-encapsulated coaxial probe. Above the probe flange is an N-50K connector, and below the flange is a metal cylinder and a dielectric material encapsulating the metal cylinder. One end is inserted into a shaping dielectric rod, and the other end is connected to a polarization synthesis network via a cable.

[0034] Furthermore, such as Figure 4 and Figure 5 The diagram shows the principle block diagram of the polarization combining network. It consists of four cables connected to a dielectric-coated coaxial probe, with two output ports. Internally, it employs a microstrip circuit design, using a 180-degree bridge, a 90-degree bridge, and a load to achieve left-hand and right-hand rotary signal output. The polarization combining network has an irregular shape design, allowing for tight connection with the shaped metal outer wall, thus reducing the size of the feed network system.

[0035] In summary, the compact, large-angle C-band dielectric feed network comprises a shaped metal outer wall, a shaped dielectric rod, four dielectric-wrapped coaxial probes, and a polarization combining network. This feed network system enables the reception of C-band dual-circular polarized signals. This invention offers advantages such as compact structure, ease of fabrication, and excellent electrical performance, and can meet the needs of C-band fixed and mobile station antennas.

[0036] It should be noted that the above descriptions and examples are intended to help those skilled in the art understand the present invention, but are not intended to limit the scope of protection of the present invention. Any modifications, scaling, alterations, improvements, and / or simplifications that do not depart from the essential content of the present invention should fall within the scope of protection of the present invention.

Claims

1. A compact large illumination angle C-band dielectric feed network structure, characterized in that, It comprises a shaped metal outer wall, a shaped dielectric rod, four dielectric-coated coaxial probes and a polarization synthesis network. The polarization synthesis network is connected with the dielectric-coated coaxial probes by four cables, outputs two ports, internally adopts a microstrip circuit design method, and realizes the output of left-handed and right-handed signals through a 180-degree bridge, a 90-degree bridge and a load. The polarization synthesis network is sleeved on the outer surface of the shaped metal outer wall, one end of the shaped dielectric rod is fixed to the necked end of the shaped metal outer wall, and the other end extends along the central axis of the shaped metal outer wall and is exposed at the flared end. The four dielectric-coated coaxial probes are symmetrically distributed at 90° along the axial direction of the shaped dielectric rod, one end of each probe penetrates the shaped metal outer wall and is inserted into the shaped dielectric rod, and the other end of each probe is connected with the polarization synthesis network through a cable. The shape of the shaped dielectric rod is fitted using the least square method, the diameter of the feed radiation port is reduced, and the feed radiation pattern has a large illumination angle.

2. The compact large scan angle C-band dielectric feed network structure according to claim 1, wherein, The necked end of the shaped metal outer wall wraps the shaped dielectric rod, providing support for the shaped dielectric rod and the dielectric-coated coaxial probes.

3. The compact large scan angle C-band dielectric feed network structure according to claim 1, wherein, The shape of the shaped metal outer wall is fitted using the least square method.

4. The compact large scan angle C-band dielectric feed network structure according to claim 1, wherein, The outer side of the flange plate of the dielectric-coated coaxial probe is an N-50K connector, the inner side of the flange plate comprises a metal cylinder and a dielectric material wrapped around the metal cylinder, one end of the probe is inserted into the shaped dielectric rod, and the other end of the probe is connected with the polarization synthesis network through a cable.

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