A compact LC dual-frequency dual-tracking dielectric feed network

Abstract

This invention discloses a compact LC dual-band dual-tracking dielectric feed network, belonging to the field of satellite communication microwave antenna technology. It employs a shaped metal outer wall, a shaped dielectric rod, and four coaxial probes to transmit L-band and C-band sum and difference signals, integrating four polarization synthesis networks. The compact structure allows for installation on smaller aperture antennas. The stepped shape of the shaped metal outer wall provides a larger illumination angle for the L-band radiation pattern of the feed. The reduced diameter of the dielectric rod at the feed outlet results in a larger illumination angle for the C-band radiation pattern, suitable for illumination by front-feed antennas, enabling single-pulse self-tracking of the antenna. This feed network system is small in size, lightweight, requires no debugging, saves significant labor costs, and is suitable for engineering application.

Description

Technical Field

[0001] This invention discloses a compact LC dual-band dual-tracking dielectric feed network, which relates to the field of satellite communication microwave antenna technology. It is suitable for L-band and C-band signal reception of fixed station and mobile station antennas and can realize self-tracking of the antenna in L-band and C-band. 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. L-band and C-band antennas have long been widely used in various important fields such as broadcasting, civil aviation, and emergency communications. Among these, the LC dual-band feed network is the core component of the antenna, and the antenna's performance largely depends on the performance of the feed network. However, due to the low frequencies of the L and C bands, traditional feed networks are bulky and cannot be used with 2.3m diameter antennas, limiting their application scenarios.

[0003] Self-tracking feed networks are the core components of telemetry, tracking, and communication satellite feed systems. Currently, the most commonly used multi-mode tracking system both domestically and internationally is the TE21 mode, which has high tracking accuracy and is widely used in satellite communication and telemetry. However, to achieve self-tracking of the TE21 mode in both L-band and C-band simultaneously, traditional feed networks are bulky and difficult to lay out. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a simple, easy-to-manufacture LC dual-frequency dielectric feed with dual-frequency self-tracking function. This invention includes a shaped metal outer wall, a shaped dielectric rod, an L-band and signal mushroom-shaped coaxial probe, an L-band and signal polarization synthesis network, an L-band difference signal coaxial probe, an L-band difference signal polarization synthesis network, a C-band and signal dielectric-wrapped coaxial probe, a C-band and signal polarization synthesis network, a C-band difference signal dielectric-wrapped coaxial probe, a C-band difference signal polarization synthesis network, and a connecting cable. The designed compact LC dual-frequency dual-tracking dielectric feed network has a simple structure, requires no debugging, is low in cost, and is easy to manufacture. It can meet the reception requirements of L-band signals (1.67GHz-1.71GHz) and C-band signals (3.625GHz-4.2GHz), as well as TE21 mode tracking in both bands. The feed pattern has a large illumination angle and can be used for front-feed antenna illumination. This invention also features a compact structure, small size, light weight, convenient operation, and low processing cost. It can be installed on antennas with a diameter of 2.3m or more and has a wide range of applications.

[0005] The objective of this invention is achieved as follows:

[0006] A compact LC dual-frequency dual-tracking dielectric feed network includes a shaped metal outer wall, a shaped dielectric rod, four L-band signal mushroom-shaped coaxial probes, eight L-band difference signal coaxial probes, an L-band signal polarization synthesis network, an L-band difference signal polarization synthesis network, four C-band signal dielectric-wrapped coaxial probes, eight C-band difference signal dielectric-wrapped coaxial probes, a C-band signal polarization synthesis network, and a C-band difference signal polarization synthesis network.

[0007] The shaped metal outer wall has a symmetrical stepped structure, including a flared section, a middle section, a middle second section, and a constricted section connected in sequence with gradually decreasing diameters; the shaped dielectric rod is located inside the shaped metal outer wall, and the central axes of the two coincide, with the end of the shaped dielectric rod protruding from the flared section; the L-band signal polarization synthesis network, the L-band difference signal polarization synthesis network, the C-band signal polarization synthesis network, and the C-band difference signal polarization synthesis network are all fitted onto the corresponding positions on the outer surface of the shaped metal outer wall;

[0008] Eight L-band difference signal coaxial probes are symmetrically distributed at 45° along the outer surface of the flared section of the shaped metal outer wall. One end of each probe is inserted into the outer wall of the shaped metal, and the other end is connected to the L-band difference signal polarization synthesis network via a cable.

[0009] Four L-band and signal mushroom-shaped coaxial probes are symmetrically distributed at 90° axial angle along the outer surface of the middle section of the shaped metal outer wall. One end of each probe is inserted into the outer wall of the shaped metal, and the other end is connected to the L-band and signal polarization synthesis network through a cable.

[0010] Eight C-band difference signal medium-encapsulated coaxial probes are symmetrically distributed at 45° axial angle along the middle two sections of the outer surface of the shaped metal outer wall. One end of each probe passes through the shaped metal outer wall and is inserted into the dielectric rod, while the other end is connected to the C-band difference signal polarization synthesis network via a cable.

[0011] Four C-band and signal medium-encapsulated coaxial probes are symmetrically distributed at 90° axial angle along the outer surface of the constricted section of the shaped metal outer wall. One end of each probe passes through the shaped metal outer wall and is inserted into the shaped medium rod, while the other end is connected to the C-band and signal polarization synthesis network via a cable.

[0012] 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 C-band radiation pattern has a large illumination angle.

[0013] Furthermore, the outer side of the flange of the L-band and signal 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.

[0014] Furthermore, the outer side of the flange of the L-band difference signal coaxial probe is an N-50K connector, and the inner side of the flange contains a metal cylinder. One end is inserted into the shaped metal outer wall, and the other end is connected to the L-band difference signal polarization synthesis network through a cable.

[0015] Furthermore, both the outer flange of the C-band differential signal medium-encapsulated coaxial probe and the outer flange of the C-band and signal medium-encapsulated coaxial probe are N-50K connectors. The inner flange contains a metal cylinder and a dielectric material that encapsulates the metal cylinder. The dielectric material encapsulates the metal cylinder near the flange.

[0016] Furthermore, the flared section and the middle section are transitioned by a smooth arc surface; the middle section and the middle second section are transitioned by an inclined surface.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The present invention uses a dielectric shaping dielectric feed source to achieve LC dual-frequency signal reception and dual-band TE21 mode dual tracking functions in a small volume.

[0019] 2. This invention uses a shaped metal outer wall to transmit L-band sum and difference signals. By changing the shape of the metal outer wall, the standing wave and radiation pattern of the L-band feed network and the sum and difference signals can be adjusted, thereby controlling the performance of the antenna.

[0020] 3. The present invention uses an L-band difference signal coaxial probe as a connection device for the feed L-band difference signal polarization synthesis network, which has a simple structure and is easy to process.

[0021] 4. The present invention uses an L-band and a signal mushroom-shaped coaxial probe as the connection device between the feed L-band and the signal polarization synthesis network. The structure is simple and easy to process.

[0022] 5. The L-band difference signal polarization synthesis network adopts a microstrip form, which has a simple structure and small size. It is connected to the feed source by a cable, and the placement of the L-band difference signal polarization synthesis network can be freely controlled by adjusting the cable length.

[0023] 6. The L-band and signal polarization synthesis network adopts a microstrip form, which has a simple structure and small size. It is connected to the feed source by a cable, and the placement of the L-band and signal polarization synthesis network can be freely controlled by adjusting the cable length.

[0024] 7. This invention uses a shaped dielectric rod to transmit C-band sum and difference signals. By changing the shape of the dielectric rod, the standing wave and radiation pattern of the C-band feed network and the sum and difference signals can be adjusted, thereby controlling the performance of the antenna.

[0025] 8. The present invention uses a coaxial probe wrapped with a C-band difference signal medium as a connection device for the feed C-band difference signal polarization synthesis network. It has a simple structure and is easy to process.

[0026] 9. The present invention uses a C-band and signal medium-encased coaxial probe as a connection device between the feed C-band and the signal polarization synthesis network. The structure is simple and easy to process.

[0027] 10. A microstrip C-band differential signal polarization synthesis network is adopted. It has a simple structure and small size. It is connected to the feed source by a cable. The placement of the C-band differential signal polarization synthesis network can be freely controlled by adjusting the cable length.

[0028] 11. The C-band and signal polarization synthesis network adopts a microstrip form, which has a simple structure and small size. It is connected to the feed source by a cable, and the placement of the C-band and signal polarization synthesis network can be freely controlled by adjusting the cable length.

[0029] 12. The present invention uses a shaped metal outer wall to wrap the shaped medium rod to provide support for the shaped medium rod and the coaxial probe.

[0030] 13. 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 LC dual-frequency dual-tracking feed network system, making it suitable for mass production. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention.

[0032] Figure 2 This is a schematic diagram of the shaping medium rod described in this invention.

[0033] Figure 3 This is a schematic diagram of the shaped metal outer wall described in this invention.

[0034] Figure 4 This is a schematic diagram of the L-band difference signal coaxial probe described in this invention.

[0035] Figure 5 This is a schematic diagram of the L-band and signal mushroom-shaped coaxial probe described in this invention.

[0036] Figure 6 This is a schematic diagram of the C-band difference signal medium-encapsulated coaxial probe described in this invention.

[0037] Figure 7 This is a schematic diagram of the C-band and signal medium-enclosed coaxial probe described in this invention.

[0038] Figure 8 This is a block diagram illustrating the principle of the L / C band and signal polarization synthesis network described in this invention.

[0039] Figure 9 This is a block diagram of the L / C band difference signal polarization synthesis network principle described in this invention.

[0040] Explanation of reference numerals in the attached figures: 1. Shaped metal outer wall; 2. Shaped dielectric rod; 3. L-band difference signal coaxial probe; 4. L-band sum signal mushroom-shaped coaxial probe; 5. L-band difference signal polarization synthesis network; 6. C-band difference signal dielectric-encased coaxial probe; 7. C-band sum signal dielectric-encased coaxial probe; 8. C-band sum signal polarization synthesis network; 9. C-band difference signal polarization synthesis network; 10. Detailed Implementation

[0041] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] A compact LC dual-frequency dual-tracking dielectric feed network includes a shaped metal outer wall, a shaped dielectric rod, four L-band signal mushroom-shaped coaxial probes, eight L-band difference signal coaxial probes, an L-band signal polarization synthesis network, an L-band difference signal polarization synthesis network, four C-band signal dielectric-encapsulated coaxial probes, eight C-band difference signal dielectric-encapsulated coaxial probes, a C-band signal polarization synthesis network, and a C-band difference signal polarization synthesis network. The L-band received signal is transmitted backward along the axial direction of the shaped metal outer wall. Eight L-band difference signal coaxial probes are symmetrically distributed at 45° along the axial direction of the shaped metal outer wall. One end is inserted into the shaped metal outer wall, and the other end is connected to the L-band difference signal polarization synthesis network through a cable. The L-band difference signal polarization synthesis network outputs two L-band TE21 mode circular polarized signals. Four L-band and signal mushroom-shaped coaxial probes are symmetrically distributed at 90° along the axial direction of the shaped metal outer wall. One end is inserted into the shaped metal outer wall, and the other end is connected to the L-band and signal polarization synthesis network through a cable. The L-band and signal polarization synthesis network outputs two L-band circular polarized signals. The C-band receiving signal is transmitted backward along the axial direction of the shaped dielectric rod. Eight C-band difference signal dielectric-wrapped coaxial probes are symmetrically distributed at 45° along the axial direction of the dielectric rod, with one end inserted into the shaped dielectric rod and the other end connected to the C-band difference signal polarization synthesis network via a cable. The C-band difference signal polarization synthesis network outputs two C-band TE21 mode circularly polarized signals. Four C-band and signal dielectric-wrapped coaxial probes are symmetrically distributed at 90° along the axial direction of the dielectric rod, with one end inserted into the shaped dielectric rod and the other end connected to the C-band and signal polarization synthesis network via a cable. The C-band and signal polarization synthesis network outputs two C-band circularly polarized signals. The outer wall of the shaped metal portion wraps around the shaped dielectric rod, providing support for the shaped dielectric rod and coaxial probes.

[0043] The shaped metal outer wall is stepped, partially encasing the shaped dielectric rod and serving as its support. It also allows adjustment of the feed pattern and has a total of twenty-four openings. Eight circular openings, symmetrically distributed at 45° along the axial direction, are used to insert L-band difference signal coaxial probes and have flanges connecting to them. Four circular openings, symmetrically distributed at 90° along the axial direction, are used to insert L-band and signal mushroom-shaped coaxial probes and have flanges connecting to them. Eight circular openings, symmetrically distributed at 45° along the axial direction, are used to insert C-band difference signal dielectric-encased coaxial probes and have flanges connecting to them. Four circular openings, symmetrically distributed at 90° along the axial direction, are used to insert C-band and signal dielectric-encased coaxial probes and have flanges connecting to them.

[0044] The shape of the shaping dielectric rod is fitted using the least squares method. It has four cylindrical recesses that are symmetrically distributed at 90° around the axis of the dielectric rod and are connected to the coaxial probe wrapped with the C-band signal medium. It also has eight cylindrical recesses that are symmetrically distributed at 45° around the axis of the dielectric rod and are connected to the coaxial probe wrapped with the C-band differential signal medium. The diameter of the shaping dielectric rod is reduced at the feed port, so that the radiation pattern of the C-band feed has a large illumination angle.

[0045] The L-band difference signal coaxial probe has an N-50K connector above the flange and a metal cylinder below the flange. One end of the cylinder is inserted into the shaped metal outer wall, and the other end is connected to the L-band difference signal polarization synthesis network via a cable.

[0046] The L-band and signal mushroom-shaped coaxial probe flange has an N-50K connector above it, and a metal rod and a metal mushroom head below it. The metal rod and the metal mushroom head are connected by threads, with one end inserted into the shaped metal outer wall and the other end connected to the L-band and signal polarization synthesis network via a cable.

[0047] The C-band difference signal medium encapsulates the coaxial probe flange, with an N-50K connector above it. Below the flange, there 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 the C-band difference signal polarization synthesis network via a cable.

[0048] The C-band and signal medium encapsulates the coaxial probe flange, which is connected to an N-50K connector. Below the flange, there 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 the C-band and signal polarization synthesis network via a cable.

[0049] The L-band difference signal polarization synthesis network consists of eight cables connected to the L-band difference signal 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 output left-hand and right-hand rotary signals of the TE21 mode. The L-band difference signal polarization synthesis network has an irregular shape, allowing for close integration with the shaped metal outer wall, thus reducing the size of the feed network system.

[0050] The L-band signal polarization synthesis network is connected to the L-band signal mushroom-shaped coaxial probe by four cables, outputting two ports. Internally, it employs a microstrip circuit design, using a 180-degree bridge, a 90-degree bridge, and a load to output left-hand and right-hand rotary signals. The L-band signal polarization synthesis network has an irregular shape, allowing for close integration with the shaped metal outer wall, thus reducing the size of the feed network system.

[0051] The C-band difference signal polarization synthesis network consists of eight cables connected to a coaxial probe wrapped with a C-band difference signal medium, outputting two ports. Internally, it employs a microstrip circuit design, using a 180-degree bridge, a 90-degree bridge, and a load to output left-hand and right-hand rotary signals of the TE21 mode. The C-band difference signal polarization synthesis network has an irregular shape, allowing for close connection with the shaped metal outer wall, thus reducing the size of the feed network system.

[0052] The C-band signal polarization synthesis network consists of four cables connected to a coaxial probe wrapped with a C-band signal medium, outputting two ports. Internally, it employs a microstrip circuit design, using a 180-degree bridge, a 90-degree bridge, and a load to output left-hand and right-hand rotary signals. The C-band signal polarization synthesis network has an irregular shape, allowing for close integration with the shaped metal outer wall, thus reducing the overall size of the feed network system.

[0053] The cable is used for the connection between the L-band difference signal coaxial probe and the L-band difference signal polarization synthesis network, the connection between the L-band and signal mushroom-shaped coaxial probe and the L-band and signal polarization synthesis network, the connection between the C-band difference signal medium-encapsulated coaxial probe and the C-band difference signal polarization synthesis network, and the connection between the C-band and signal medium-encapsulated coaxial probe and the C-band and signal polarization synthesis network.

[0054] This compact LC dual-band dual-tracking dielectric feed network employs a shaped metal outer wall, a shaped dielectric rod, and four coaxial probes to transmit L-band and C-band sum and difference signals. It integrates four polarization synthesis networks, resulting in a compact structure suitable for installation on smaller aperture antennas. The stepped shape of the shaped metal outer wall provides a larger illumination angle for the feed's L-band radiation pattern. The reduced diameter of the dielectric rod at the feed exit provides a larger illumination angle for the feed's C-band radiation pattern, suitable for use with front-feed antennas, enabling single-pulse self-tracking. This feed network system is small, lightweight, requires no debugging, saves significant labor costs, and is suitable for engineering deployment.

[0055] Specifically, such as Figure 1 As shown, this compact LC dual-frequency dual-tracking dielectric feed network includes a shaped metal outer wall, a shaped dielectric rod, four L-band signal mushroom-shaped coaxial probes, eight L-band difference signal coaxial probes, one L-band signal polarization combining network, one L-band difference signal polarization combining network, four C-band signal dielectric-encapsulated coaxial probes, eight C-band difference signal dielectric-encapsulated coaxial probes, one C-band signal polarization combining network, and one C-band difference signal polarization combining network. Figure 2 The image shows a shaped dielectric rod. Its curve shape was obtained by least-squares fitting. It has four cylindrical recesses symmetrically distributed at 90° around the rod's axis, connecting to the C-band and signal dielectric-encased coaxial probes. It also has eight cylindrical recesses symmetrically distributed at 45° around the rod's axis, connecting to the C-band differential signal dielectric-encased coaxial probes. The diameter of the shaped dielectric rod decreases at the feed port, giving the feed's C-band radiation pattern a large illumination angle. The shaped dielectric rod is a key component in ensuring the feed's C-band standing wave ratio and radiation pattern.

[0056] Furthermore, such as Figure 3 The diagram shows the shaped metal outer wall, which is stepped and partially encloses the shaped dielectric rod, serving as support for it and allowing adjustment of the L-band feed pattern. It has twenty-four circular openings. Eight of these openings are symmetrically distributed at 45° along the axial direction for inserting L-band difference signal coaxial probes, and each has a flange for connection to the L-band difference signal coaxial probe. Four of these openings are symmetrically distributed at 90° along the axial direction for inserting L-band and signal mushroom-shaped coaxial probes, and each has a flange for connection to both. Similarly, eight circular openings are symmetrically distributed at 45° along the axial direction for inserting C-band difference signal dielectric-encased coaxial probes, and each has a flange for connection to the C-band difference signal coaxial probe. Finally, four circular openings are symmetrically distributed at 90° along the axial direction for inserting C-band and signal dielectric-encased coaxial probes, and each has a flange for connection to both.

[0057] Furthermore, such as Figure 4The image shows a coaxial probe for L-band difference signals. Above the probe flange is an N-50K connector, and below the flange is a metal cylinder. One end is inserted into the shaped metal outer wall, and the other end is connected to the L-band difference signal polarization synthesis network via a cable.

[0058] Furthermore, such as Figure 5 The image shows an L-band and signal mushroom-shaped coaxial probe. Above the probe flange is an N-50K connector, and below the flange are a metal rod and a metal mushroom head. The metal rod and the metal mushroom head are connected by threads. One end is inserted into the shaped metal outer wall, and the other end is connected to the L-band and signal polarization synthesis network via a cable.

[0059] Furthermore, such as Figure 6 The image shows a C-band difference signal 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 C-band difference signal polarization synthesis network via a cable.

[0060] Furthermore, such as Figure 7 The image shows a C-band and signal 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 the C-band and signal polarization synthesis network via a cable.

[0061] Furthermore, such as Figure 8 The diagram shows the principle block diagram of the L / C band signal polarization synthesis network. It has four input ports and two output ports, and internally employs a microstrip circuit design. Left-hand and right-hand rotation signals are achieved through 180-degree and 90-degree bridges, loads, etc. The signal polarization synthesis network has an irregular shape design, allowing for tight connection with the shaped metal outer wall, reducing the size of the feed network system.

[0062] Furthermore, the block diagram of the L / C band difference signal polarization synthesis network shows that it has eight input ports and 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 differential signal outputs. The differential signal polarization synthesis network has an irregular shape design, allowing for close connection with the shaped metal outer wall, thus reducing the size of the feed network system.

[0063] In summary, the compact LC dual-band dual-tracking dielectric feed network includes a shaped metal outer wall, a shaped dielectric rod, four L-band sum signal mushroom-shaped coaxial probes, eight L-band difference signal coaxial probes, one L-band sum signal polarization combining network, one L-band difference signal polarization combining network, four C-band sum signal dielectric-wrapped coaxial probes, eight C-band difference signal dielectric-wrapped coaxial probes, one C-band sum signal polarization combining network, and one C-band difference signal polarization combining network. This feed network system enables the reception of LC band dual circular polarization sum and difference signals. This invention has advantages such as compact structure, ease of fabrication, and excellent electrical performance, and can meet the needs of LC band fixed and mobile station antennas.

Claims

1. A compact LC dual-frequency dual-tracking dielectric feed network, characterized in that, It includes a shaped metal outer wall, a shaped dielectric rod, four L-band signal mushroom-shaped coaxial probes, eight L-band difference signal coaxial probes, an L-band signal polarization synthesis network, an L-band difference signal polarization synthesis network, four C-band signal dielectric-encapsulated coaxial probes, eight C-band difference signal dielectric-encapsulated coaxial probes, a C-band signal polarization synthesis network, and a C-band difference signal polarization synthesis network; The shaped metal outer wall has a symmetrical stepped structure, including a flared section, a middle section, a middle second section, and a constricted section connected in sequence with gradually decreasing diameters; the shaped dielectric rod is located inside the shaped metal outer wall, and the central axes of the two coincide, with the end of the shaped dielectric rod protruding from the flared section; the L-band signal polarization synthesis network, the L-band difference signal polarization synthesis network, the C-band signal polarization synthesis network, and the C-band difference signal polarization synthesis network are all fitted onto the corresponding positions on the outer surface of the shaped metal outer wall; Eight L-band difference signal coaxial probes are symmetrically distributed at 45° along the outer surface of the flared section of the shaped metal outer wall. One end of each probe is inserted into the outer wall of the shaped metal, and the other end is connected to the L-band difference signal polarization synthesis network via a cable. Four L-band and signal mushroom-shaped coaxial probes are symmetrically distributed at 90° axial angle along the outer surface of the middle section of the shaped metal outer wall. One end of each probe is inserted into the outer wall of the shaped metal, and the other end is connected to the L-band and signal polarization synthesis network through a cable. Eight C-band difference signal medium-encapsulated coaxial probes are symmetrically distributed at 45° axial angle along the middle two sections of the outer surface of the shaped metal outer wall. One end of each probe passes through the shaped metal outer wall and is inserted into the dielectric rod, while the other end is connected to the C-band difference signal polarization synthesis network via a cable. Four C-band and signal medium-encapsulated coaxial probes are symmetrically distributed at 90° axial angle along the outer surface of the constricted section of the shaped metal outer wall. One end of each probe passes through the shaped metal outer wall and is inserted into the shaped medium rod, while the other end is connected to the C-band and signal polarization synthesis network via a cable.

2. The compact LC dual-frequency dual-tracking dielectric feed network according to claim 1, characterized in that, The shape of the shaping dielectric rod is fitted using the least squares method, and the diameter of the feed radiation aperture is reduced to give the feed C-band radiation pattern a large illumination angle.

3. The compact LC dual-frequency dual-tracking dielectric feed network according to claim 1, characterized in that, The outer side of the flange of the L-band and signal 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.

4. The compact LC dual-frequency dual-tracking dielectric feed network according to claim 1, characterized in that, The outer side of the L-band difference signal coaxial probe has an N-50K connector, and the inner side of the flange contains a metal cylinder. One end is inserted into the shaped metal outer wall, and the other end is connected to the L-band difference signal polarization synthesis network via a cable.

5. A compact LC dual-frequency dual-tracking dielectric feed network according to claim 1, characterized in that, Both the C-band differential signal medium-encapsulated coaxial probe and the C-band signal medium-encapsulated coaxial probe have N-50K connectors on the outside of their flanges. The inside of the flanges contains a metal cylinder and a dielectric material that encapsulates the metal cylinder. The dielectric material encapsulates the metal cylinder near the flange.

6. A compact LC dual-frequency dual-tracking dielectric feed network according to claim 1, characterized in that, The flared section and the middle section are transitioned by a smooth arc surface; the middle section and the middle second section are transitioned by an inclined surface.

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