CN110994103A

CN110994103A - Three-in three-out coupling bridge

Info

Publication number: CN110994103A
Application number: CN201911255061.1A
Authority: CN
Inventors: 余雷; 马汀; 夏凡; 谢志伟
Original assignee: Spinner Telecommunication Devices Shanghai Co ltd
Current assignee: Spinner Telecommunication Devices Shanghai Co ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-04-10

Abstract

The invention discloses a three-in three-out coupling bridge which is characterized by comprising a first bridge, a second bridge and a coupler, wherein the first bridge, the second bridge and the coupler are arranged in parallel, the coupler is of a symmetrical structure, and the first bridge and the second bridge are both of an asymmetrical structure; the coupler is arranged between the first bridge and the second bridge, the coupler is respectively connected with the first bridge and the second bridge through coaxial lines, and the first bridge and the second bridge are connected through a phase matching line. The invention uses the design of a symmetrical 4.8DB coupler and an asymmetrical 3DB bridge, can greatly reduce the size of the 3DB bridge to nearly half of the symmetrical type, and simultaneously, the phase matching cannot be changed. In addition, the present invention reduces the cost of the design.

Description

Three-in three-out coupling bridge

Technical Field

The invention relates to a three-in three-out coupling bridge, belonging to the field of mobile wireless communication.

Background

The three-in three-out coupling bridge is evolved from a 3dB coupling bridge, the 3dB bridge is used for coupling adjacent frequency or non-adjacent frequency radio frequency signals initially, and a 4-in 4-out coupling matrix (consisting of 43 DB bridges) is developed due to the requirement of the communication industry on multi-path signal synthesis. The three-in three-out coupling matrix was proposed since large cellular base stations required simultaneous use of 3 sectors for better signal coverage and optimal power utilization.

In the field of communication at present, a three-input three-output coupling matrix generally covers the frequency from 700MHz to 2.7GHz, and with the demand of fifth-generation mobile communication for such products, it is urgently needed to extend the original coverage frequency to 3.8 GHz. Further consider the Tetra compatibility; GSM-R; PMR, etc. is the frequency of professional wireless mobile and public safety functions, and the downward frequency coverage needs to reach 380 MHz.

Currently, couplers (bridges) such as 3DB, 4.8DB, 6DB can be classified into symmetrical ladder coupling (as shown in fig. 6), asymmetrical ladder coupling (as shown in fig. 7), continuous coupling (as shown in fig. 8), and the like according to the coupling structure.

The traditional three-input three-output coupling bridge such as CN205752480U is composed of two 3DB bridges with symmetrical structures and a 4.8DB coupler with symmetrical structures, and the requirement of phase matching is achieved through a section of phase matching transmission line, so that the energy from an input port to each output port is basically the same. Because the traditional three-in three-out internal use is a symmetrical structure, under the condition of a certain frequency bandwidth, the structural length is certain, namely, the 3DB bridge and the 4.8DB coupler are both the same length, in order to realize the structural compactness, 50 ohm transmission lines are additionally led out from one input port and one output port of the 4.8DB coupler to the outer side of the cavity respectively, and the overall size is further increased.

As shown in fig. 3, the conventional three-in three-out coupling bridge has a structure that ① and ② ports are input ports of a 3DB bridge, ③ ports are input ports of a 4.8DB bridge, ④ and ⑤ ports are output ports of the 3DB bridge, and ⑥ ports are output ports of the 4.8DB bridge.

The traditional three-input three-output coupling bridge is characterized in that a 3DB bridge or a 4.8DB coupler is formed by a symmetrical structure, and a phase matching line is added, so that the volume and the length are relatively overlarge in the product design of general bandwidth, the size is increased by multiple times due to the requirement of expanding the frequency to low frequency and greatly increasing the bandwidth, and the commercial use cannot be realized due to the fact that the cost is greatly increased by continuously adopting the technology.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the size of the three-in three-out coupling bridge is reduced under the condition of not changing the performance, and the cost is reduced.

In order to solve the technical problem, the technical scheme of the invention is to provide a three-input three-output coupling bridge, which is characterized by comprising a first bridge, a second bridge and a coupler, wherein the first bridge, the second bridge and the coupler are arranged in parallel, the coupler is in a symmetrical structure, and the first bridge and the second bridge are both in an asymmetrical structure; the coupler is arranged between the first bridge and the second bridge, the coupler is respectively connected with the first bridge and the second bridge through coaxial lines, and the first bridge and the second bridge are connected through a phase matching line.

Preferably, the first bridge and the second bridge are arranged in an opposite configuration with respect to the coupler.

Preferably, the first bridge and the second bridge are both 3DB bridges; the coupler is a 4.8DB coupler.

Preferably, the coupler is of a 9-level symmetrical structure; the first bridge and the second bridge are both 5-stage asymmetric structures.

Preferably, the frequency coverage of the three-in three-out coupling bridge is 380-3800 MHz.

Preferably, the electrical length of the phase matching line is equal to the electrical length of the coupler.

Preferably, the phase matching line is arranged on the back surface of the coupling bridge and crosses the coupler.

Preferably, three input ports and three output ports are arranged around the coupling bridge, the three input ports are respectively a first port, a second port and a third port, and the three output ports are respectively a fourth port, a fifth port and a sixth port; the first bridge is provided with an eleventh bridge port, a twelfth bridge port, a thirteenth bridge port and a fourteenth bridge port; a twenty-first bridge port, a twenty-second bridge port, a twenty-third bridge port and a twenty-fourth bridge port are arranged on the second bridge; the coupler is provided with a first coupling port, a second coupling port, a third coupling port and a fourth coupling port;

the first port is connected with the third coupling port, and the second port and the third port are respectively connected with the fourteenth electric bridge port and the twelfth electric bridge port; the sixth port is connected with the fourth coupling port, and the fourth port and the fifth port are respectively connected with the twenty-fourth bridge port and the twenty-second bridge port; the first coupling port and the second coupling port are respectively connected with the eleventh bridge port and the twenty-third bridge port through coaxial lines, and the thirteenth bridge port is connected with the twenty-first bridge port through a phase matching line.

The invention uses the design of a symmetrical 4.8DB coupler and an asymmetrical 3DB bridge, can greatly reduce the size of the 3DB bridge to nearly half of the symmetrical type, and simultaneously, the phase matching cannot be changed. In addition, the present invention reduces the cost of the design.

Drawings

Fig. 1 is a schematic structural diagram (three-dimensional structure) of a three-in three-out coupling bridge according to the present invention;

FIG. 2 is a schematic diagram (sheet structure) of a three-input three-output coupling bridge according to the present invention;

FIG. 3 is a schematic diagram of a conventional three-input three-output coupling bridge;

FIG. 4 is a schematic diagram of a three-in three-out coupling bridge assuming a side-by-side design of a 4.8DB coupler using a symmetrical design and two 3DB bridges using a symmetrical design;

FIG. 5 is a schematic diagram of a three-in three-out coupling bridge according to the present invention;

FIG. 6 is a schematic diagram of a symmetrical step coupling;

FIG. 7 is a schematic diagram of asymmetric step coupling;

FIG. 8 is a schematic illustration of a sequential coupling;

FIG. 9 is a schematic side cross-sectional view (perspective) of a three-in three-out coupling bridge with a cover plate;

fig. 10 is a schematic side cross-sectional view (sheet configuration) of a three-in three-out coupling bridge with a cover plate.

Detailed Description

In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

Example 1

The present invention is a three-in three-out coupling bridge, as shown in fig. 1, which uses a symmetrical 4.8DB coupler plus an asymmetrical 3DB bridge design, and can greatly reduce the size of the 3DB bridge to nearly half of the symmetrical one, and at the same time, the phase matching will not change. The first bridge 1 and the second bridge 2 are asymmetric 3DB bridges, and are shorter than symmetric bridges in size to achieve the same frequency bandwidth. Coupler 3 is a symmetric 4.8DB coupler.

The frequency of the three-input three-output coupling bridge covers 380-.

The invention adopts the design of a three-in three-out coupling bridge formed by connecting 23 DB bridges with asymmetric structures and 4.8DB couplers with symmetric structures. 2 asymmetric structure 3DB bridges and a 4.8DB coupler are arranged in parallel. The two 3DB bridges are structurally reversed with respect to the 4.8DB coupler.

The first bridge 1, the second bridge 2 and the coupler 3 are arranged in parallel to achieve the optimal size. Because the 4.8DB coupler is also of a symmetrical structure, and the 3DB bridge is shortened by nearly one time, the port arrangement can still achieve uniform distribution, so that the product size is optimal. The coupler 3 is arranged between the first bridge 1 and the second bridge 2, the coupler 3 is respectively connected with the first bridge 1 and the second bridge 2 through coaxial lines, and the first bridge 1 is connected with the second bridge 2 through a phase matching line 5. That is, the phase matching line 5 needs to connect the ports of the two 3DB bridges, and the electrical length must be the same as that of the 4.8DB coupler, so it is designed to be compact in design across the 4.8DB coupler by being designed to the back of the coupling bridge.

In this embodiment, the first bridge 1 is an asymmetric 3DB bridge at the input end, the second bridge 2 is an asymmetric 3DB bridge at the output end, the phase matching line 5 is a phase matching 50 ohm transmission line, and the electrical length of the phase matching line 5 must be equal to the electrical length of the coupler 3. The coaxial line is a 50 ohm coaxial line.

As shown in fig. 1, the coupling bridge of the present invention has three input ports and three output ports around it, which define: the three input ports are respectively a first port 41, a second port 42 and a third port 43; the three output ports are a fourth port 44, a fifth port 45, and a sixth port 46, respectively. (conversely, the three input ports are the fourth port 44, the fifth port 45 and the sixth port 46, respectively, and the three output ports are the first port 41, the second port 42 and the third port 43, respectively).

The first bridge 1 is provided with an eleventh bridge port 11, a twelfth bridge port 12, a thirteenth bridge port 13 and a fourteenth bridge port 14; the second bridge 2 is provided with a twenty-first bridge port 21, a twenty-second bridge port 22, a twenty-third bridge port 23 and a twenty-fourth bridge port 24; the coupler 3 is provided with a first coupling port 31, a second coupling port 32, a third coupling port 33, and a fourth coupling port 34.

The first port 41 is connected to the third coupling port 33 of the 4.8DB coupler, and the second port 42 and the third port 43 are connected to the fourteenth bridge port 14 and the twelfth bridge port 12 of the input 3DB bridge (i.e., the first bridge 1), respectively.

The sixth port 46 is connected to the fourth coupling port 34 of the 4.8DB coupler and the fourth port 44 and the fifth port 45 are connected to the twenty-fourth bridge port 24 and the twenty-second bridge port 22, respectively, of the output 3DB bridge, i.e. the second bridge 2.

The 4.8DB coupler is arranged in the middle of the structure, the first coupling port 31 and the second coupling port 32 of the 4.8DB coupler are respectively connected with the eleventh bridge port 11 and the twenty-third bridge port 23 of the 3DB bridge through 50 ohm coaxial lines, the thirteenth bridge port 13 of the input end 3DB bridge passes through the lower layer through a 50 ohm phase matching line (since the upper part needs to be provided with a cover plate, the 50 ohm phase matching line connecting the two 3DB bridges needs to pass through the lower part of the 4.8DB coupler to be connected in the cavity of the three-in three-out coupling bridge of the invention, as shown in fig. 9) and is connected with the twenty-first bridge port 21 of the output end 3DB bridge. The electrical length of this phase match line is equal to the 4.8DB coupler electrical length.

As shown in fig. 4 and 5, ③ ports are the first port 41 in fig. 1, ① and ② ports are the second port 42 and the third port 43 in fig. 1, ⑥ ports are the sixth port 46 in fig. 1, ④ and ⑤ ports are the fourth port 44 and the fifth port 45 in fig. 1.

Assuming a symmetrical design of 4.8DB coupler and two symmetrical design of 3DB bridges side by side, as shown in fig. 4, the ports still require 50 ohm irregular extensions to allow for the design distance between ②③ and ⑤⑥ ports to be standardized, although the product size can be reduced.

Therefore, the three-in three-out coupling bridge adopts the asymmetric design of the 3DB bridge and the symmetric design of the 4.8DB coupler, as shown in FIG. 5, the arrangement of each port realizes the uniform equal division design, the 50 ohm extension line of the port is the coaxial direct connection design, and the three-in three-out isolation and the standing wave index are optimally ensured.

Example 2

In this embodiment, as shown in fig. 2, the inner conductor used in the three-in three-out coupling bridge of the present invention is a sheet structure, and the frequency of the inner conductor is 380 and 3800 MHz.

Changing the first bridge 1 to a third bridge 10; the second bridge 2 is changed to a fourth bridge 20; the coupler 3 is changed to a first coupler 30; the phase match line 5 is changed to a first phase match line 50.

The first port 41, the second port 42, and the third port 43 are connected to the input ports of the 4.8DB coupler and the input 3DB bridge, respectively.

The sixth port 46, the fourth port 44, and the fifth port 45 are connected to the output ports of the 4.8DB coupler and the input 3DB bridge, respectively.

The interiors of the two 3DB bridges are connected through a 50-ohm phase matching line through a lower layer (since a cover plate needs to be arranged at the upper part, the 50-ohm phase matching line connected with the two 3DB bridges needs to penetrate through the lower part of the 4.8DB coupler and is connected in the cavity of the three-input three-output coupling bridge, as shown in figure 10), and the other two ports are respectively connected with the two ports of the 4.8DB coupler.

The rest is the same as in example 1.

Claims

1. A three-input three-output coupling bridge is characterized by comprising a first bridge (1), a second bridge (2) and a coupler (3), wherein the first bridge (1), the second bridge (2) and the coupler (3) are arranged in parallel, the coupler (3) is of a symmetrical structure, and the first bridge (1) and the second bridge (2) are both of an asymmetrical structure; the coupler (3) is arranged between the first electric bridge (1) and the second electric bridge (2), the coupler (3) is respectively connected with the first electric bridge (1) and the second electric bridge (2) through coaxial lines, and the first electric bridge (1) is connected with the second electric bridge (2) through a phase matching line (5).

2. A three-in three-out coupling bridge according to claim 1, characterized in that the first bridge (1) and the second bridge (2) are structurally arranged in an opposite configuration with respect to the coupler (3).

3. A three-in three-out coupling bridge according to claim 1, wherein the first bridge (1) and the second bridge (2) are both 3DB bridges; the coupler (3) is a 4.8DB coupler.

4. A three-input three-output coupling bridge according to claim 1 or 3, characterized in that the coupler (3) has a 9-stage symmetrical structure; the first electric bridge (1) and the second electric bridge (2) are both in 5-stage asymmetric structures.

5. The three-in three-out coupling bridge as claimed in claim 4, wherein the frequency of the three-in three-out coupling bridge covers 380-3800 MHz.

6. A three-in three-out coupling bridge as claimed in claim 1, wherein the electrical length of the phase matching line (5) is equal to the electrical length of the coupler (3).

7. A three-in three-out coupling bridge as claimed in claim 6, wherein the phase match line (5) is provided on the back side of the coupling bridge and across the coupler (3).

8. A three-input three-output coupling bridge as claimed in claim 1, wherein three input ports and three output ports are arranged around the coupling bridge, the three input ports are a first port (41), a second port (42) and a third port (43), and the three output ports are a fourth port (44), a fifth port (45) and a sixth port (46); the first bridge (1) is provided with an eleventh bridge port (11), a twelfth bridge port (12), a thirteenth bridge port (13) and a fourteenth bridge port (14); a twenty-first bridge port (21), a twenty-second bridge port (22), a twenty-third bridge port (23) and a twenty-fourth bridge port (24) are arranged on the second bridge (2); the coupler (3) is provided with a first coupling port (31), a second coupling port (32), a third coupling port (33) and a fourth coupling port (34);

the first port (41) is connected with the third coupling port (33), and the second port (42) and the third port (43) are respectively connected with the fourteenth electric bridge port (14) and the twelfth electric bridge port (12); the sixth port (46) is connected with the fourth coupling port (34), and the fourth port (44) and the fifth port (45) are respectively connected with the twenty-fourth bridge port (24) and the twenty-second bridge port (22); the first coupling port (31) and the second coupling port (32) are respectively connected with the eleventh bridge port (11) and the twenty-third bridge port (23) through coaxial lines, and the thirteenth bridge port (13) is connected with the twenty-first bridge port (21) through a phase matching line (5).