A novel low intermodulation circulator chain

Abstract

A novel low-intermodulation circulator chain disclosed by the present invention comprises a circulator chain cavity body and an outer cover plate detachably connected to the circulator chain cavity body; an inner cover plate is arranged between the circulator chain cavity body and the outer cover plate; a circulator module is arranged between the circulator chain cavity body and the inner cover plate; magnetic field sources are respectively arranged on the top of the inner cover plate and the outer bottom surface of the circulator chain cavity body, and the magnetic field sources are located at positions corresponding to the circulator module to provide a magnetic field for the ferrite of the circulator module. The present invention combines three circulators, and the indexes are similar to those of a single circulator, and the intermodulation will not deteriorate.

Description

Technical Field

[0001] The present invention belongs to the technical field of circulators, and particularly relates to a novel low-intermodulation circulator chain. Background Art

[0002] Compared with the electrical performance indicators of a single circulator, the electrical performance indicators of a traditional circulator chain are significantly insufficient. If only a single circulator is used for assembly, it is not conducive to the requirements of miniaturization and integration of devices, and the third-order intermodulation is likely to deteriorate during the installation process. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a novel low-intermodulation circulator chain to solve the problem of insufficient electrical performance indicators of the circulator chain in the prior art.

[0004] A low-intermodulation circulator chain includes a circulator cavity and an inner cover plate installed on the circulator cavity; three circulator modules are installed between the circulator cavity and the inner cover plate; magnetic field sources are provided on the top of the inner cover plate and the outer bottom surface of the circulator cavity; and a plurality of tuning screws are provided around the magnetic field sources.

[0005] Further, the circulator module includes a ferrite and a metal matching block; the metal matching blocks are respectively arranged on the inner bottom surface of the circulator cavity and the bottom of the inner cover plate; the ferrite is located between the two metal matching blocks; and the magnetic field source is arranged corresponding to the ferrite.

[0006] Further, an outer cover plate is also installed on the circulator cavity; the inner cover plate is installed between the circulator cavity and the outer cover plate.

[0007] Further, a first sealing ring is provided at the connection between the circulator cavity and the outer cover plate.

[0008] Further, magnetic field cavities are provided on the top of the inner cover plate and the outer bottom surface of the circulator cavity; the magnetic field source is encapsulated in the magnetic field cavity through a magnetic field cover.

[0009] Further, the magnetic field source is a permanent magnet.

[0010] Further, the material of the ferrite is garnet stone.

[0011] Further, a port is provided at the bottom of the circulator cavity; four ports are symmetrically arranged on both sides of the circulator cavity.

[0012] Further, a flange conversion is provided at the bottom of the circulator cavity.

[0013] Further, the circulator modules are connected by dielectric filters.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0015] By constructing a new boundary condition around the ferrite with tuning screws, the present invention changes the boundary condition by adjusting the length of the tuning screws, thereby changing the internal field distribution of the circulator part and achieving the performance we need, and solving the problem of insufficient electrical performance indicators of the circulator chain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the forward split structure of an embodiment of the present invention;

[0017] Figure 2 Schematic diagram of the reverse split structure of an embodiment of the present invention;

[0018] Figure 3 Front view of an embodiment of the present invention;

[0019] Figure 4 Bottom view of an embodiment of the present invention;

[0020] Figure 5 Structure block diagram of the present invention;

[0021] Figure 6 Structure block diagram of an embodiment of the present invention;

[0022] Figure 7 Circulator chain simulation diagram of an embodiment of the present invention.

[0023] Reference numerals: 1 - circulator cavity; 2 - inner cover plate; 3 - dielectric filter; 4 - outer cover plate; 5 - metal matching block; 6 - ferrite; 7 - magnetic field source; 8 - magnetic field cover; 9 - matching step; 10 - first sealing ring; 11 - tuning screw; 12 - fastening screw; 13 - flange conversion; 14 - second sealing ring; 15 - third sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and specific examples.

[0025] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown in the figure, a low intermodulation circulator chain includes a circulator cavity 1, an inner cover plate 2, a dielectric filter 3, an outer cover plate 4, a metal matching block 5, a ferrite 6, a magnetic field source 7, a magnetic field cover 8, a matching step 9, a first sealing ring 10, a tuning screw 11, a fastening screw 12, a flange conversion 13, a second sealing ring 14, and a third sealing ring 15. There are five waveguide input / output ports on the circulator cavity 1. One of the waveguide ports is located at the bottom of the unit cavity and is used to connect to the ODU device. The remaining four ports are symmetrically distributed in two groups on both sides of the circulator cavity 1. During use, a transceiver device is connected to one side, and the corresponding next-stage load is connected to the other side.

[0026] An inner cover plate 2 is provided between the circulator cavity 1 and the outer cover plate 4; three circulator modules are installed between the circulator cavity 1 and the inner cover plate 2; the circulator module includes a ferrite 6 and a metal matching block 5; the number of metal matching blocks 5 is two, which are respectively arranged on the inner bottom surface of the circulator cavity 1 and the bottom of the inner cover plate 2; the ferrite 6 is located between the two metal matching blocks 5, and the centers of the three coincide; magnetic field sources 7 are respectively provided on the top of the inner cover plate 2 and the outer bottom surface of the circulator cavity 1, and the magnetic field sources 7 are located at positions corresponding to the ferrite 6 to provide a magnetic field for the ferrite 6. The magnetic field sources 7 are encapsulated in the magnetic field cavity through the magnetic field cover 8; the circulator modules are connected by the dielectric filter 3, and the circulator cavity 1 is provided with a matching step 9 at the position of the connected waveguide port.

[0027] Several tuning screws 11 are provided around the magnetic field source 7. It plays a role in conveniently correcting the mutual influence generated by the connection between the circulator and the dielectric filter 3, thereby optimizing the performance.

[0028] The ferrite 6 is made of garnet material and is a dedicated low intermodulation ferrite, which solves the influence of the key index of intermodulation on the device.

[0029] A first sealing ring 10 is provided at the connection between the circulator cavity 1 and the outer cover plate 4, and a second sealing ring 14 is provided at the two ports on one side of the circulator cavity 1, which plays a role in improving the airtightness, reliability and stability of the circulator.

[0030] A third sealing ring 15 is provided at the connection between the bottom of the circulator cavity 1 and the flange conversion 13.

[0031] The circulator cavity 1 and the inner cover plate 2 are connected by fastening screws 12, and the flatness requirement of the connection surface is relatively high to reduce the influence on intermodulation.

[0032] The working principle of the present invention is as follows: The three circulators are isolated from each other through the cavity wall and do not interfere with each other. The circulators are connected pairwise through dielectric filters and used in combination. The signal is input through the waveguide circulator in the middle and output to the digital microwave transceiver (ODU) at the bottom of the cavity. The two signals for reception and transmission are respectively subjected to frequency selection transmission through the dielectric filters and circulators arranged on both sides. The entire transmission system realizes interference-free transmission between the received and transmitted signals through the reverse isolation effect of the circulator and the out-of-band high suppression function of the dielectric filter. The dielectric resonator cavity filter has a very high quality factor, low loss, and small volume at the same time; due to the very small temperature drift of the dielectric resonator, the performance indicators of the entire system are also very excellent in high and low temperature environments. The dedicated low-intermodulation ferrite ensures excellent overall intermodulation performance. The specific simulation results of the circulator chain are as Figure 7 shown. In the frequency range of 7.1 GHz to 8.5 GHz, the return loss of the circulator is -25 dBm, meeting the requirements for the return loss of the circulator in the vast majority of environments.

[0033] The present invention is an integrated device. All the devices used adopt the waveguide port input and output structure, which is small in size, light in weight, simple in operation, convenient in installation, and good in reliability, greatly improving the production efficiency, ensuring higher precision in processing, and having better performance indicators than products of the same kind with non-this structure.

[0034] The present invention combines three circulators, and the indicators are similar to those of a single circulator, and the intermodulation will not deteriorate. The cavity, the inner cover plate, and the outer cover plate are connected by fastening screws. The circulator components are processed on the cavity and the inner cover plate.

[0035] The three circulators of the present invention work independently. After being connected to the filter and integrated debugging, they are used. All the connections between the devices adopt waveguide ports, with a very simple and reliable structure, convenient debugging, and the intermodulation index of the entire unit is more stable and excellent than that of the traditional connection using cables and adapters. The electrical performance is good, and the influence of the installation process on the intermodulation is reduced.

[0036] The above has introduced the present application in detail. Specific examples are used in the present invention to explain the principle and implementation manner of the present application. The descriptions of the above embodiments are only used to help understand the method and core idea of the present application. There will be changes in the specific implementation manner and application scope. In summary, this description should not be construed as a limitation to the present application.

Claims

1. A low intermodulation circulator chain, characterized in that, It includes a circulator cavity and an inner cover plate installed on the circulator cavity; three circulator modules are installed between the circulator cavity and the inner cover plate; magnetic field sources are provided on the top of the inner cover plate and the outer bottom surface of the circulator cavity; several tuning screws are provided around the magnetic field sources; Among them, the circulator module includes a ferrite and a metal matching block; the metal matching blocks are respectively arranged on the inner bottom surface of the circulator cavity and the bottom of the inner cover plate; the ferrite is located between the two metal matching blocks; the magnetic field source is arranged corresponding to the ferrite; the three circulator modules are connected to each other in pairs through dielectric filters; the three circulators are isolated by the cavity wall; the circulator cavity is provided with a matching step at the position of the connected waveguide port; the material of the ferrite is garnet stone; A port is provided at the bottom of the circulator cavity for connecting to an ODU device; four ports are symmetrically arranged on both sides of the circulator cavity, with two ports in a group. One side of the circulator cavity is for receiving and transmitting equipment, and the other side is for connecting to the corresponding next-stage load.

2. The low intermodulation circulator chain according to claim 1, wherein An outer cover plate is also installed on the circulator cavity; the inner cover plate is installed between the circulator cavity and the outer cover plate.

3. The low intermodulation circulator chain according to claim 2, characterized in that, A first sealing ring is provided at the connection between the circulator cavity and the outer cover plate.

4. A low intermodulation circulator chain according to claim 1, characterized in that Magnetic field cavities are provided on the top of the inner cover plate and the outer bottom surface of the circulator cavity; the magnetic field source is encapsulated in the magnetic field cavity through a magnetic field cover.

5. A low intermodulation circulator chain according to claim 1, characterized in that The magnetic field source is a permanent magnet.

6. The low intermodulation circulator chain according to claim 1, wherein A flange conversion is provided at the bottom of the circulator cavity.

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