CN107910628B

CN107910628B - High-suppression duplexer

Info

Publication number: CN107910628B
Application number: CN201711039507.8A
Authority: CN
Inventors: 李承泽
Original assignee: Dfine Technology Co Ltd
Current assignee: Dfine Technology Co Ltd
Priority date: 2017-10-31
Filing date: 2017-10-31
Publication date: 2021-01-05
Anticipated expiration: 2037-10-31
Also published as: CN107910628A

Abstract

The invention relates to a high-inhibition duplexer, which solves the problems that the debugging of the existing duplexer needs to disassemble a cover plate to adjust the inner size, two duplexers are required to be connected in series, the volume is large, and the loss and standing wave are poor. The signal passes through a tap line (11) of a 1 st port, one path is connected with a 2 nd port through a 1 st resonator, a 2 nd resonator, a 4 th resonator and a 3 rd resonator which are connected in series, the other path of the tap line (11) is connected with a 3 rd port through a 6 th resonator, a 7 th resonator, a 9 th resonator and a 8 th resonator (8) which are connected in series, two 1 st grooves and 2 nd grooves which are connected in parallel are arranged in a cavity (14) and are connected with a tap line open groove (17), the peripheries of the 1 st grooves and the 2 nd grooves are formed by connecting a plurality of arcs with equal radiuses in series, the 1 st to 10 th resonators and a resonator (19) connected with the tap line are respectively positioned at the centers of the arcs with the same radiuses, and a cover plate (18) of the cavity (14) is provided with an adjusting screw.

Description

High-suppression duplexer

Technical Field

The present invention relates to a device for implementing a frequency selective function for a transceiver antenna.

Background

The duplexer integrates signals into a receiver through the antenna, and transmits the signals through the antenna, so that the receiver and the transmitter are required to complete the functions of the receiver and the transmitter respectively without mutual influence, the mutual influence between the receiver and the transmitter mainly depends on the inhibition between the receiver and the transmitter, the higher the inhibition is, the higher the anti-interference capability is, and the maximum mutual inhibition in a conventional communication system is about 110 dB. However, with the development of technology and the need of business, the suppression requirements among the duplexers are relatively high, and the existing duplexers for conventional suppression cannot meet the requirements of the existing systems. The prior duplexer mainly has the following defects:

1. the mutual influence between the receiving and the transmitting of the duplexer is large, so that the inhibition cannot be improved;

2. when the suppression is insufficient in debugging, the cover plate needs to be detached to adjust the size of the inside, and the method is completely inapplicable to the suppression control of the high-suppression duplexer;

3. the assembly process is complex, which is not beneficial to the mass production of high-inhibition duplexers;

4. for a system with a high suppression, a single duplexer can not meet the index requirement, and two duplexers are connected in series, but the volume is large, and the loss and the standing wave are poor.

Disclosure of Invention

The invention aims to provide a high-suppression duplexer which is simple in structure, easy to assemble, convenient to adjust and capable of achieving limit suppression of 150 dB.

The invention is realized by the following steps:

the high-rejection duplexer, the signal passes the tap line 11 of the 1 st port, one path passes the 1 st, 2 nd, 4 th, 5 th harmonic in

seriesThe resonators

1, 2, 4 and 5 are connected with the 2 nd port, the

resonators

2 and 4 of the 2 nd and 4 th are connected with the two ends of the resonator 3 of the 3 rd, the other path of the tap line 11 is connected with the 3 rd port through the resonators 6, 7, 9 and 10 of the 6 th, 7 th and 9 th resonators 6, 7, 9 and 10 which are connected in series, the resonators 7 and 9 of the 7 th and 8 th are connected with the two ends of the resonator 8, two parallel 1 st and 2 nd slots in the cavity 14 are connected with the open slot 17 of the tap line, the peripheries of the 1 st groove and the 2 nd groove are formed by connecting a plurality of arcs with equal radius in series, the 1 st-10 th resonators and the resonators 19 connected with the tapped lines are respectively positioned at the centers of the arcs with equal radius, the cover plate 18 of the cavity 14 is provided with an adjusting screw, the lower end of the adjusting screw is positioned in the 1 st groove and the 2 nd groove, the lower end of the adjusting screw is positioned on the central connecting line of the adjacent resonators, and the included angle of the two tap lines 11 connected with the resonators 19 is 75.^oThe cavity 14 and the cover plate 18 are hermetically connected through a fastening screw 12, the lower end of a 1 st zero point coupling adjusting screw 15 is positioned on the central connecting lines of the 2 nd and 4

th resonators

2 and 4, and the lower end of a 2 nd zero point coupling adjusting screw is positioned on the central connecting lines of the 7 th and 9 th resonators 7 and 9.

The centers of the 1 st, 2 nd, 3 rd, 4 th and 5 th resonators are respectively positioned at the vertex of a triangle, the centers of the 6 th, 7 th and 8 th resonators and the 7 th, 8 th and 9 th resonators are respectively positioned at the vertex of a triangle, the centers of the 1 st and 2 th resonators and the resonator 19 connected with a tapped line are positioned at the vertex of a triangle, and the centers of the 6 th, 7 th resonators and the other resonator 19 connected with a tapped line are positioned at the vertex of a triangle.

The invention aims to improve the suppression to 150dB, and firstly reduces the mutual interference of signals between two paths of receiving and transmitting circuits, wherein the interference may come from the connection of a public end or the interference of the two paths of the receiving and transmitting circuits. In order to reduce crosstalk at the common end, the two paths of the receiving and transmitting circuits are separated by an included angle of 75 degrees, and the cavity 14 between the two paths of the receiving and transmitting circuits is sealed by a sealing cover plate 18 and fastened by a fastening screw 12 so as to prevent mutual crosstalk between the two paths.

The conventional zero point method is not suitable for suppressing the high duplexer, and the structure is realized according to a circuit schematic diagram (as shown in fig. 3). This structure is very troublesome because it requires the cover plate adjustment coupling disk 16 to be removed when suppression is insufficient, and it is also difficult to ensure that the index can be satisfied, and only repeated debugging and then removal of the cover are performed.

In order to meet the 150dB suppression, the invention uses a new zero transmission mode (as shown in figure 4), and when the suppression is not enough, only the 1 st zero coupling adjusting screw 15 needs to be externally adjusted according to the actual suppression. The mode is convenient to adjust and easy to debug.

The method for realizing the structure of the schematic diagram comprises the steps that the resonator 2 plays a role of generating frequency in the cavity 14, then the signal is transmitted to the other resonator 4 through the zero point coupling adjusting screw 15 of the 1 st point, and then the suppression zero point is formed. When the 1 st zero-point coupling adjusting screw 15 is tuned to the deeper in the cavity 14, the coupling is stronger, and vice versa, the coupling is weaker.

According to the working principle of the high-rejection duplexer (as shown in fig. 5), a signal is divided into two paths after passing through a port 1 to form the duplexer. The resonator 1 and the resonator 2 in one path are communicated and then respectively connected with the

resonators

3 and 4. Wherein the resonator 2 is connected with the resonator 4 to form a zero point transmission (as shown in fig. 4), then connected with the resonator 5, and finally output through the port 2. The other path of resonator 6 is connected to resonator 7 and then to resonator 8 and resonator 9, respectively. The resonator 7 is connected with the resonator 9 to form a zero point transmission (as shown in fig. 4), and then is connected with the resonator 10 and finally output through the port 3.

The invention has the following beneficial effects:

the high-inhibition duplexer has the advantages of reliable process, and simple assembly and debugging. Adjustment can be inhibited without removing the cover plate 18, and the inhibition requirement is satisfied by an external adjustment method. The volume of the product is greatly reduced, more space is made on the whole machine, and the weight and the cost are greatly reduced. The other electrical performance indexes are unchanged even if the volume is reduced, and the indexes are stable and reliable in the using process.

The high-inhibition duplexer belongs to a pure passive device, mainly comprises a cavity and a resonator, and the 150dB high inhibition is realized by adopting a band-pass of a cavity structure. It is coupled to the next resonator mainly by means of adjusting screws. The mode ensures that the whole 150dB high-inhibition duplexer is convenient to assemble and debug, has stable and reliable indexes, greatly improves the whole performance, and is a breakthrough that the inhibition of the conventional duplexer can only be about 110 dB.

Drawings

Fig. 1 is a schematic diagram of the circuit of the present invention.

Fig. 2 is a plan view of the common terminal structure of the present invention.

Fig. 3 is a diagram of a conventional null scheme.

Fig. 4 is a diagram of the zero point transmission mode of the present invention.

Fig. 5 is a block diagram of the present invention.

FIG. 6 is a structural diagram of the chamber and the cover plate of the present invention.

FIG. 7 is a graph showing the actual measurement of a sample.

Detailed Description

The signal passes through the tap line of the 1 st port, one path is connected with the 2 nd port through the 1 st, 2 nd, 4 th and 5

th resonators

1, 2, 4 and 5 connected in series, the 2 nd and 4

th resonators

2 and 4 are connected with the two ends of the 3 rd resonator 3, the other path of the tap line is connected with the 3 rd port through the 6 th, 7 th, 9 th and 10 th resonators 6, 7, 9 and 10 connected in series, the 7 th and 9 th resonators 7 and 9 are connected with the two ends of the 8 th resonator 8, two 1 st and 2 nd parallel grooves in the cavity 14 are connected with an open groove 17 of the tap line, the peripheries of the 1 st groove and the 2 nd groove are formed by connecting a plurality of arcs with equal radius in series, the 1 st to 10 th resonators and the resonators 19 connected with the tap lines are respectively positioned at the centers of the arcs with equal radius, the cover plate 18 of the cavity 14 is provided with adjusting

screws

20 and 21, the lower ends of the adjusting screws are positioned in the 1 st groove and the 2 nd groove, the angle between the two tap lines 11 connected to the resonator 19 at the center of the arcs of the two parallel slots is 75.^oThe cavity 14 and the cover plate 18 are hermetically connected through a fastening screw 12, the lower end of the adjusting screw is positioned between the resonators, the lower end of a 1 st zero point coupling adjusting screw 15 is positioned between the 2 nd and 4

th resonators

2 and 4, and the lower end of a 2 nd zero point coupling adjusting screw is positioned between the 7 th and 9 th resonators 7 and 9.

The 150dB high-inhibition duplexer is realized by adopting a band-pass of a cavity structure, and the structure has the characteristics of large power capacity, high Q value of a single cavity and good shielding performance. This is also achieved according to the principle of the filter, as shown in fig. 1, and the order can be increased or decreased according to the actual requirement.

The inductance L, the capacitance C and the internal impedance R in the resonant cavity are connected in parallel in the circuit to generate frequency, wherein the range of the frequency depends on the inductance L and the capacitance C, and the frequency is lower when the value is larger, and is higher when the value is opposite. The in-band insertion loss depends on the internal resistance R, and the higher Q value of the single-cavity internal resistance R indicates that the insertion loss in a passband is small, and the opposite is larger. The part of the parallel inductor Lcapacitor C and the internal resistor R to the ground is a resonance point, then two adjacent frequency points are transmitted in a normalized coupling mode to increase the working bandwidth, and E on the schematic diagram is a capacitance normalized value.

Claims

1. A high-suppression duplexer comprises a cavity (14) and a cover plate (18), and is characterized in that a signal passes through a 1 st tap line (11) of a 1 st port and then is connected with a 2 nd port through 11 th, 1 st, 2 nd, 4 th and 5 th resonators (19, 1, 2 nd, 4 th and 5 th resonators (19, 5) which are sequentially connected in series, a 2 nd resonator (2) is connected with one end of a 3 rd resonator (3), a 4 th resonator (4) is connected with the other end of the 3 rd resonator (3), the signal passes through a 2 nd tap line (11) of the 1 st port and then is connected with a 3 rd port through 12 th, 6 th, 7 th, 9 th and 10 th resonators (19, 6, 7 th, 9 and 10 th resonators (19, 7 th and 10 th resonators) (19, 7 th, 9 th and 10 th resonators) (7 th), a 9 th resonator (9) is connected with the other end of an 8 th open slot (8)), two 1 st and 2 nd slots which are connected in parallel with a 1 st and 2 nd tap, the peripheries of the 1 st and 2 nd grooves are formed by connecting a plurality of arcs with equal radius in series, the 1 st to 10 th resonators and the 11 th and 12 th resonators (19) respectively connected with the 1 st and 2 nd tapped lines are respectively positioned at the centers of the arcs with equal radius, the cover plate (18) of the cavity (14) is provided with an adjusting screw, the lower end of the adjusting screw is positioned in the 1 st and 2 nd grooves, the lower end of the adjusting screw is positioned on the central connecting line of the adjacent resonators and is respectively connected with the 1 st and 2 nd tapped lines (11) of the 11 th and 12 th resonators (19)Included angle of 75^oThe cavity (14) is hermetically connected with the cover plate (18) through a fastening screw (12), the lower end of a 1 st zero point coupling adjusting screw (15) is positioned on the central connecting lines of the 2 nd and 4 th resonators (2) and (4), the lower end of a 2 nd zero point coupling adjusting screw is positioned on the central connecting lines of the 7 th and 9 th resonators (7) and (9), the centers of the 1 st, 2 nd and 3 th resonators are respectively positioned on the vertexes of a triangle, the 3 rd and 4 th, the centers of the 5 th resonators are respectively positioned on the other vertex of the triangle, the centers of the 6 th, 7 th and 8 th resonators are respectively positioned on the vertex of the triangle, the centers of the 7 th, 8 th and 9 th resonators are respectively positioned on the other vertex of the triangle, the 1 st and 2 th resonators and the 11 th resonator (19) connected with the 1 st tap line are positioned on the vertex of the triangle, and the 6 th and 7 th resonators and the 12 th resonator (19) connected with the 2 nd tap line are positioned on the vertex of the triangle.