Double-sided magnetized microstrip circulator, isolator and T/R assembly
Technical Field
The utility model belongs to the technical field of circulator design and manufacturing, especially, relate to a microstrip circulator to and isolator and the T/R subassembly of using this kind of microstrip circulator.
Background
The circulator is a non-reversible device with a plurality of ends, comprises a gyromagnetic body made of gyromagnetic materials, and the gyromagnetic materials generate gyromagnetic characteristics under the combined action of an external microwave magnetic field and a constant direct-current magnetic field, so that electromagnetic waves propagating in the gyromagnetic body are polarized and rotated, and the unidirectional transmission of high-frequency signal energy is realized, and the circulator is widely applied to the field of microwave communication. With the development of communication technology, the requirements for the circulator are higher and higher, for example, the circulator is required to be small in size and simple in process, and meanwhile, the circulator can meet the requirement for high integration.
At present, with the rapid establishment of the 5G communication network, a great deal of microstrip circulators which can meet the requirements of modularization, miniaturization and economy of the 5G communication network construction are urgently needed. Therefore, there is a need for a microstrip circulator with low insertion loss in a surface mount scenario.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned deficiencies of the prior art, the object of the present invention is to: a double-sided magnetized microstrip circulator with low insertion loss in a surface mounting scene is provided.
In order to realize the purpose of the utility model, the utility model provides a following technical scheme:
a microstrip circulator with double-sided magnetization comprises a gyromagnetic layer, a central conductor, a substrate, an upper permanent magnet and a lower permanent magnet, wherein the central conductor is arranged on the upper surface of the gyromagnetic layer and is provided with a plurality of connecting parts;
the upper surface of the substrate is provided with a first grounding metal layer and a plurality of signal ends which are insulated and isolated from the first grounding metal layer, and the lower surface of the substrate is provided with a plurality of welding areas which are respectively and electrically connected with the first grounding metal layer and the signal ends correspondingly;
the lower surface of the magnetic rotating layer is provided with a second grounding metal layer and a plurality of connecting ends which correspond to the connecting parts one by one; the first grounding metal layer is insulated and isolated from the connecting end, and the corresponding connecting part is electrically connected with the connecting end;
the rotating magnetic layer is arranged on the substrate, and the lower surface of the rotating magnetic layer and the upper surface of the substrate are arranged in a face-to-face mode; and the first grounding metal layer is electrically connected with the second grounding metal layer, and the connecting ends are in one-to-one correspondence with the signal ends and are electrically connected with the signal ends.
The utility model discloses a microstrip circulator realizes two-sided magnetization through setting up a permanent magnet respectively in center conductor's top and below, improves the magnetization effect to reduce insertion loss. In addition, the base plate is additionally arranged, so that the effect of buffering external force can be achieved, and the impact of the external force on the rotary magnet is reduced.
According to a specific implementation mode, in the microstrip circulator of the present invention, the lower permanent magnet is disposed in the mounting hole formed on the upper surface of the substrate. The lower permanent magnet is arranged in the mounting hole of the substrate, so that not only can the optimized magnetic circuit be improved, but also the miniaturization of the microstrip circulator can be realized.
According to a specific embodiment, the microstrip circulator of the present invention further comprises a magnetic shield; wherein the magnetic shield is used for combining with the substrate so as to accommodate the upper permanent magnet and the lower permanent magnet in the magnetic shield. Through setting up the magnetic shield cover, can make the magnetic circuit of permanent magnet denser, reduce the interference of revealing the magnetic field to components and parts on every side simultaneously.
The utility model discloses further aim at: the probability of gyromagnetic fracture of the circulator under strong temperature impact is reduced.
In the microstrip circulator of the present invention, preferably, the substrate is a PCB board or a ceramic board. When the external PCB generates strong temperature impact on the microstrip circulator, the deformation quantity is small because the thermal expansion coefficient of the base plate material is between the external circuit board and the gyromagnetic material, so that the internal stress under the strong temperature impact can be buffered, and the probability of gyromagnetic fracture of the circulator is reduced.
According to a specific implementation mode, in the microstrip circulator of the utility model, the magnetism rotating layer is provided with a plurality of metallization via holes, connecting portion pass through metallization via hole and corresponding link electric connection.
According to a specific embodiment, in the microstrip circulator of the present invention, the side of the magnetic layer is provided with a plurality of metallized grooves or metal connecting lines; each connecting part extends to the edge of the upper surface of the gyromagnetic layer and is electrically connected with the corresponding connecting end through the metallization groove or the metal connecting wire.
According to a specific embodiment, the microstrip circulator of the present invention further comprises a dielectric sheet and a temperature compensation sheet; the medium sheet is arranged between the central conductor and the permanent magnet, and the temperature compensation sheet is arranged between the medium sheet and the permanent magnet. A medium sheet is arranged between the central conductor and the permanent magnet, so that the gap between the central conductor and the permanent magnet can be adjusted, and a magnetic circuit is optimized; and a temperature compensation sheet is arranged between the central conductor and the permanent magnet, so that the temperature characteristic of the circulator is improved.
The utility model also provides an isolator, it includes the utility model discloses a two-sided magnetized microstrip circulator, and the load of connecting is served to one or more signal of microstrip circulator.
The utility model also provides a T/R subassembly, it includes the utility model discloses a two-sided magnetized microstrip circulator, and the receiving and dispatching circuit who connects is served to one or more signals of microstrip circulator.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses a microstrip circulator not only realizes two-sided magnetization through setting up a permanent magnet respectively in center conductor's top and below, improves the magnetization effect to reduce insertion loss. In addition, the base plate is additionally arranged, so that the effect of buffering external force can be achieved, and the impact of the external force on the rotary magnet is reduced.
2. The utility model discloses an among the microstrip circulator, the coefficient of thermal expansion of base plate material is between outside circuit board and gyromagnetic material, if adopt PCB board or ceramic plate, can cushion the internal stress under the strong temperature impact to reduce the circulator and appear the cracked probability of gyromagnetic.
Drawings
Fig. 1 is an exploded view of the microstrip circulator of the present invention;
FIG. 2 is a schematic structural view of the lower surface of the gyromagnetic layer of the microstrip circulator of the present invention;
FIG. 3 is a schematic structural diagram of the microstrip circulator of the present invention with a dielectric sheet;
list of reference numerals
10-substrate, 11 a-first signal terminal, 11 b-second signal terminal, 11 c-third signal terminal, 12-first ground metal layer, mounting hole 13, 20-gyromagnetic layer, 21 a-first connecting terminal, 21 b-second connecting terminal, 21 c-third connecting terminal, 22-second ground metal layer, 30-central conductor, 30 a-first connecting part, 30 b-second connecting part, 30 c-third connecting part, 40 a-upper permanent magnet, 40 b-lower permanent magnet and 50-dielectric sheet.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
As shown in fig. 1 and fig. 2, the microstrip circulator with double-sided magnetization of the present invention includes a gyromagnetic layer 20, a central conductor 30 disposed on the upper surface of the gyromagnetic layer 20, and also includes a substrate 10, and an upper permanent magnet 40a and a lower permanent magnet 40b disposed above and below the central conductor 30, respectively.
The upper surface of the substrate 10 is provided with a first ground metal layer 12, a first signal terminal 11a, a second signal terminal 11b and a third signal terminal 11c, and the lower surface of the substrate 10 is provided with soldering regions corresponding to the first ground metal layer 12, the first signal terminal 11a, the second signal terminal 11b and the third signal terminal 11c, respectively. The first ground metal layer 12 is insulated and isolated from the first signal terminal 11a, the second signal terminal 11b and the third signal terminal 11c, and the first ground metal layer 12, the first signal terminal 11a, the second signal terminal 11b and the third signal terminal 11c are electrically connected to the corresponding soldering regions.
The central conductor 30 disposed on the upper surface of the gyromagnetic layer 20 includes a first connection portion 30a, a second connection portion 30b, and a third connection portion 30c, and the lower surface of the gyromagnetic layer 20 includes a second ground metal layer 22 and a first connection end 21a, a second connection end 21b, and a third connection end 21c corresponding to the first connection portion 30a, the second connection portion 30b, and the third connection portion 30 c. The second ground metal layer 22 is insulated and isolated from the first connection end 21a, the second connection end 21b and the third connection end 21c, the corresponding first connection end 21a is electrically connected with the first connection portion 30a, the second connection end 21b is electrically connected with the second connection portion 30b, and the third connection end 21c is electrically connected with the third connection portion 30 c.
The gyromagnetic layer 20 is disposed on the substrate 10, the lower surface of the gyromagnetic layer 20 and the upper surface of the substrate 10 are disposed in a face-to-face manner, the second ground metal layer 22 of the gyromagnetic layer 20 is electrically connected to the first ground metal layer 12 of the substrate 10, and the first connection end 21a, the second connection end 21b and the third connection end 21c are respectively in one-to-one correspondence with and electrically connected to the first signal end 11a, the second signal end 11b and the third signal end 11 c.
Specifically, in the microstrip circulator of the present invention, the lower permanent magnet 40b is disposed in the mounting hole 13 formed on the upper surface of the substrate 10. Wherein, the thickness of lower permanent magnet 40b is adapted with the degree of depth of mounting hole 13, and this mounting hole 13 is the blind hole. The installation hole 13 is arranged at a position right opposite to the central conductor 30, and the centers of the upper permanent magnet 40a and the lower permanent magnet 40b are ensured to have better contact ratio during assembly, so that the optimized magnetic circuit is improved, meanwhile, the thickness of the circulator is prevented from being increased, and the miniaturization of the microstrip circulator is realized.
When implementing, the utility model discloses a connecting portion that the link of gyromagnetic layer 20 lower surface is electric connection with the central conductor 30's that its upper surface set up mode can adopt: the gyromagnetic layer 20 is provided with a corresponding number of metalized through holes, and the connecting parts are electrically connected with the corresponding connecting ends on the lower surface of the gyromagnetic layer 20 through the metalized through holes. Or, a plurality of metallized grooves or metal connecting lines are arranged on the side of the gyromagnetic layer 20; moreover, each connection portion extends to the edge of the upper surface of the gyromagnetic layer 20 and is electrically connected with the corresponding connection end of the lower surface of the gyromagnetic layer 20 through a metalized groove or a metal connection line.
Furthermore, the first ground metal layer 12, the first signal terminal 11a, the second signal terminal 11b, the third signal terminal 11c and the corresponding soldering regions on the substrate 10 can be electrically connected through the metalized via holes on the substrate, or can be electrically connected through the metalized grooves or metal connecting wires on the side of the substrate 10.
The utility model discloses a microstrip circulator adopts printing technology earlier with the port in the ground metal layer on gyromagnetic layer and the base plate when the preparation, prints into corresponding pattern with silver thick liquid, carries out the silver thick liquid sintering again. The combination mode of the gyromagnetic layer and the substrate is that a layer of soldering paste is brushed on the surface of the gyromagnetic layer, then the gyromagnetic layer and the substrate are aligned, and then the gyromagnetic layer and the substrate are placed into a high-temperature sintering furnace or a reflow soldering machine for sintering.
Meanwhile, as will be known to those skilled in the art, the number of ports of the circulator depends on the shape design of the central conductor, i.e., the central conductor has a plurality of connecting portions, generally speaking, the number of ports of the circulator is three or more, and the specific number of ports depends on the actual product requirements.
In order to reduce the chance of gyromagnetic cracking of the circulator under strong temperature shock. In the microstrip circulator of the present invention, the substrate 10 is a PCB or ceramic board. Because the thermal expansion coefficient of the base plate material is between the external circuit board and the gyromagnetic material, the internal stress under strong temperature impact can be buffered, and the probability of gyromagnetic body fracture of the circulator is reduced.
As shown in fig. 3, the microstrip circulator of the present invention may further include a dielectric sheet 50 disposed between the central conductor 30 and the upper permanent magnet 40a, so as to adjust the gap between the central conductor and the upper permanent magnet and optimize the magnetic circuit. Further, in order to improve the temperature characteristic of the circulator, the microstrip circulator of the present invention may further include a temperature compensation plate disposed between the dielectric plate 50 and the upper permanent magnet 40a, so as to improve the temperature characteristic of the circulator. The utility model discloses in, medium piece and temperature compensation piece adopt the mode of bonding to realize fixedly.
Through simulation experiment to test with frequency range, insertion loss, reverse isolation and voltage standing wave ratio the utility model discloses a performance.
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Increase even magnetic sheet
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Non-increasing uniform magnetic sheet
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Frequency of
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3.3~3.9GHz
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3.35~3.7GHz
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Insertion loss
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0.27dB
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0.36dB
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Reverse isolation
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24.1dB
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22.5dB
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Voltage standing wave ratio
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1.15
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1.18 |
In addition, in order to further improve the magnetization characteristic of the circulator, the microstrip circulator of the utility model also comprises a magnetic shield; wherein the magnetic shield is used in combination with the base plate to accommodate the upper and lower permanent magnets 40a and 40b therein. Through setting up the magnetic shield cover, can make the magnetic circuit of permanent magnet denser, reduce the interference of revealing the magnetic field to components and parts on every side simultaneously.
Furthermore, the utility model also provides an isolator, it includes the utility model discloses a two-sided magnetized microstrip circulator to and electric connection's load is served to one or more signal of microstrip circulator. And simultaneously, the utility model also provides a T/R subassembly, it includes the utility model discloses a two-sided magnetized microstrip circulator to and with one or more signal of microstrip circulator on electric connection's transceiver circuit.
Those skilled in the art can use the microstrip circulator of the present invention in combination with corresponding components and circuit modules to form products for specific applications, such as isolators and T/R assemblies, which are not described herein again.