Duplexer with miniaturized structure

Abstract

The invention discloses a duplexer with a miniaturized structure, which relates to the technical field of microwave filters and comprises an outer conductor, a resonator, a front cover plate, a rear cover plate and an input / output structure. The resonators are distributed up and down, the upper part of each resonator is a loading cavity in the high-end filter, the lower part of each resonator is a loading cavity of the low-end filter, the segmentation part of each resonator is L-shaped, and the coupling ring of the duplexer is positioned on one side of the resonator and is integrally processed with the resonator. And the front cover plate and the rear cover plate are connected with the outer conductor and the resonator. The input and output structure is a coaxial structure. According to the invention, the mutual influence between the high-end filter and the low-end filter is avoided. The coupling rings and the resonators of the duplexer are integrally processed, so that the error is small, the consistency is high, and the processing is easy. And the resonator and the outer conductor are separately processed and then assembled, so that the consistency of the assembled duplexer is improved.

Description

Technical Field

[0001] The invention relates to a duplexer with a miniaturized structure, belonging to the technical field of microwave filters. Background Art

[0002] With the widespread application of 5G communication equipment, the use of U-band and L-band has increased. With the miniaturization of system equipment, there are many demands for the miniaturization of the duplexer located at the RF front end. In places where there are many size restrictions, the structural arrangement of the duplexer is particularly important. The structural arrangement of the duplexer is directly related to the size and volume of the duplexer. The miniaturization of the duplexer has become a design trend. At the same time, its structure must be easy to process and debug, and have high consistency.

[0003] In the prior art, the Chinese invention patent with patent number CN202023264980.6 discloses "a miniaturized base station antenna built-in cavity duplexer", and the common end of the duplexer adopts the form of a common cavity to improve the isolation of the duplexer and reduce the mutual interference between the two filters. The common cavity and the common end are connected by an RF cable. The RF cable needs to be a certain length to be led out to the common end. The length of the RF cable at the common end spans the length of the cavity, which poses a risk of loosening. The Chinese invention patent with patent number CN201620807847.5 discloses "a miniaturized cavity duplexer for digital repeaters", which is arranged on the upper and lower sides, and its loading cavity part is processed separately. The upper half of the resonant rod is fixed to the lower half of the resonant rod by threads, which is prone to inconsistency after assembly and the risk of loosening of the resonant rod.

[0004] Currently, it is necessary to find a new structural method to solve the miniaturization of U-band and L-band duplexers. This structure is easy to process, easy to produce, and has high consistency. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide an L-shaped partition to solve the problem of mutual influence between high-end and low-end filters. At the same time, the coupling ring in the resonator is processed as one piece to improve the consistency of the duplexer. The outer conductor and the resonator are processed separately, which is easy to process and batch.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0007] A duplexer with a miniaturized structure comprises an outer conductor (6); the outer conductor is a square ring structure with thickness; a front cover plate and a rear cover plate are respectively provided on both sides of the square ring structure to form a closed space;

[0008] A resonator is provided inside the enclosed space; the resonator includes a common cavity, a high-end filtering cavity, and a low-end filtering cavity, where there are multiple high-end filtering cavities and multiple low-end filtering cavities; the high-end filtering cavity and the low-end filtering cavity are respectively located on both sides of the common cavity and are both in communication with the common cavity; the high-end filtering cavities and the low-end filtering cavities are in one-to-one correspondence, and the corresponding high-end filtering cavity and low-end filtering cavity are on the same straight line.

[0009] An L-shaped partition is also provided on the outer wall of the cavity of the resonator and is integrally connected thereto; the L-shaped partition is perpendicular to the front and rear covers and is connected to the front and rear covers, forming two sub-cavities bounded by the L-shaped partition inside the enclosed space.

[0010] Tuning rods passing through the outer conductor are provided in both the high-end filtering cavity and the low-end filtering cavity.

[0011] Furthermore, a coupling ring is provided inside the enclosed space, and the coupling ring is connected to the outer wall of the resonator cavity; the coupling ring is in a C shape, and its two ends are respectively connected to the outer walls of the high-end filtering cavity and the low-end filtering cavity.

[0012] Furthermore, a part of the L-shaped partition is located between the coupling ring and the resonator, and the other part is parallel to the central axis of the resonator.

[0013] Furthermore, there is a spacing between the cavity walls of adjacent filtering cavities to form a tuning coupling region.

[0014] Furthermore, it further includes a common port, a high-end filtering output terminal, and a low-end filtering output terminal; the common port, the high-end filtering output terminal, and the low-end filtering output terminal are all installed on the outer wall of the outer conductor. Among them, the inner probe of the common port is connected to the coupling ring, the inner probe of the high-end filtering output terminal extends into the high-end filtering cavity, and the inner probe of the low-end filtering output terminal extends into the low-end filtering cavity.

[0015] Furthermore, the high-end filtering output terminal and the low-end filtering output terminal are located on the same side of the resonator and are respectively connected to the high-end filtering cavity and the low-end filtering cavity that are on the same straight line on this side.

[0016] Furthermore, it further includes a plurality of tuning coupling screws; the tuning coupling screws are installed on one of the covers, and the inner ends of the tuning coupling screws penetrate through the cover and are located in the corresponding tuning coupling region and the region between the outer wall of the filtering cavity corresponding to the output terminal and the outer conductor.

[0017] The region between the outer wall of the filtering cavity corresponding to the output terminal and the outer conductor and each tuning coupling region correspond to one tuning coupling screw.

[0018] Furthermore, the resonator, the coupling ring, and the L-shaped partition are integrally designed.

[0019] Due to the adoption of the above technical solutions, the technical progress achieved by the present invention is as follows:

[0020] The present invention improves the mutual isolation between the two filters by adopting an L-shaped partition structure to separate the upper and lower high and low frequency band filters. At the same time, the coupling ring and the resonator are processed as one piece, and the resonator and the outer conductor are processed separately. After assembly, the consistency of the duplexer is improved, making the duplexer easy to process, debug and produce.

[0021] 1. The present invention realizes the superposition of the upper and lower filters through the L-shaped partition on the resonator, and the L-shaped division reduces the mutual influence of the two filters.

[0022] 2. The coupling ring on one side of the resonator of the present invention is processed in one piece, which reduces the error caused by manual welding later and improves the consistency.

[0023] 3. The outer conductor and the resonator of the present invention are processed separately, so that the duplexer as a whole is easy to process, debug and mass produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of a front view of a resonator of the present invention;

[0025] Figure 2 It is a schematic diagram of a right side view of a resonator of the present invention;

[0026] Figure 3 is a schematic diagram of a front view of an outer conductor of the present invention;

[0027] Figure 4 It is a schematic diagram of the assembly diagram of the duplexer of the present invention;

[0028] Figure 5 It is a schematic diagram of the appearance of the duplexer of the present invention;

[0029] Among them, 1 is the resonator, 2 is the resonator L-shaped partition, 3 is the coupling ring, 4 is the loading cavity inside the high-end filter, 5 is the loading cavity inside the low-end filter, 6 is the outer conductor, 7 is the output end of the high-end filter, 8 is the output end of the low-end filter, 9 is the common end, 10 is the tuning rod of the high-end filter, 11 is the tuning rod of the low-end filter, 12 is the high-end filter, 13 is the low-end filter, 14 is the rear cover, and 15 is the front cover. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0031] A duplexer with a miniaturized structure, the duplexer structure comprises an outer conductor, a resonator, a front cover, a rear cover and an input-output structure. The resonator is processed in one piece, and the resonator is composed of an upper and lower part. The partition of the resonator is L-shaped, the upper part is the loading cavity inside the high-end filter, and the lower part is the loading cavity inside the low-end filter. One side of the resonator contains a coupling ring, and the coupling ring is processed in one piece with the resonator. Screws are left at the connection between the resonator and the outer conductor, the front cover and the rear cover. The input and output ends of the duplexer are coaxial ports.

[0032] Figure 1 It is a schematic diagram of the front view of the resonator. The resonator 1 is divided into two parts, the upper part and the lower part, with the 2L-shaped partition as the decomposition point. The upper part is the loading cavity 4 inside the high-end filter, and the lower part is the loading cavity 5 inside the low-end filter. The left side of the resonator 1 is the coupling ring 3. The resonator 1, the resonator L-shaped partition 2, and the coupling ring 3 are processed as one piece. The spacing between the L-shaped partition 2 and the coupling ring 3 is adjusted according to the simulation waveform. Threaded holes are left around the L-shaped partition 2 for fixing to the outer conductor and the front and rear cover plates.

[0033] Figure 2 It is a schematic side view of the resonator, and a threaded hole is left on the side of the L-shaped partition 2 for fixed connection with the outer conductor.

[0034] Figure 3 It is a schematic diagram of a front view of the outer conductor. A through hole is left on the right side of the outer conductor 6 and the threaded holes on the side of the L-shaped partition 2 are fixed by screws.

[0035] Figure 4 It is the internal structure diagram of the assembled duplexer. After the resonator 1 and the outer conductor 6 are fixed, they are fixed to the rear cover plate 14, and the screws at the joint are tightened. Then the output end 7 of the high-end filter, the output end 8 of the low-end filter, and the common end 9 are fixed through the corresponding threaded holes. Corresponding blind holes are left at the joints between the inner conductors of the output end 7 of the high-end filter and the output end 8 of the low-end filter and the resonator 1. The screws are tightened after ensuring good contact. The position where the inner conductor of the common end 9 connects with the resonator 1 is a through hole. The screws are tightened after docking. After all the screws are tightened, the output end 7 of the high-end filter, the output end 8 of the low-end filter, and the joints of the common end 9 are soldered with solder to ensure good contact. The tuning rod 10 of the high-end filter and the tuning rod 11 of the low-end filter are put into the threaded holes corresponding to the outer conductor 6 in turn, and the nuts are lightly put on without tightening. Tighten them after debugging later.

[0036] Figure 5 It is an overall schematic diagram of the duplexer. The screws at all joints of the resonator 1, the outer conductor 6, the rear cover 14 and the front cover 15 are ensured to be tightened before debugging. The front cover 15 is provided with tuning pins for inter-cavity coupling.

Claims

1. A duplexer with a miniaturized structure, characterized in that: It includes an outer conductor (6); the outer conductor is a square annular structure with a thickness; a front cover plate and a rear cover plate are respectively provided on both sides of the square annular structure to form a sealed space; A resonator is provided in the sealed space; the resonator includes a common cavity, a high-end filtering cavity, and a low-end filtering cavity, wherein there are multiple high-end filtering cavities and multiple low-end filtering cavities; the high-end filtering cavity and the low-end filtering cavity are respectively located on both sides of the common cavity and are both communicated with the common cavity; the high-end filtering cavities and the low-end filtering cavities are in one-to-one correspondence, and the corresponding high-end filtering cavity and low-end filtering cavity are on the same straight line; An L-shaped partition is also integrally connected to the outer wall of the resonator cavity; the L-shaped partition is perpendicular to the front and rear cover plates and is connected to the front and rear cover plates, forming two sub-cavities bounded by the L-shaped partition in the sealed space; Tuning rods penetrating the outer conductor are provided in both the high-end filtering cavity and the low-end filtering cavity.

2. The miniaturized duplexer according to claim 1, characterized in that: A coupling ring is also provided in the sealed space, and the coupling ring is connected to the outer wall of the resonator cavity; the coupling ring is in a C shape, and its two ends are respectively connected to the outer walls of the high-end filtering cavity and the low-end filtering cavity.

3. The miniaturized duplexer according to claim 2, characterized in that: One part of the L-shaped partition is located between the coupling ring and the resonator, and the other part is parallel to the central axis of the resonator.

4. The miniaturized duplexer according to claim 2, characterized in that: There is a spacing between the cavity walls of adjacent filtering cavities to form a tuning coupling region.

5. The miniaturized duplexer according to claim 4, characterized in that: It also includes a common port, a high-end filtering output terminal, and a low-end filtering output terminal; the common port, the high-end filtering output terminal, and the low-end filtering output terminal are all installed on the outer wall of the outer conductor. Among them, the inner probe of the common port is connected to the coupling ring, the inner probe of the high-end filtering output terminal extends into the high-end filtering cavity, and the inner probe of the low-end filtering output terminal extends into the low-end filtering cavity.

6. The miniaturized duplexer according to claim 5, characterized in that: The high-end filtering output terminal and the low-end filtering output terminal are located on the same side of the resonator and are respectively connected to the high-end filtering cavity and the low-end filtering cavity on the same side and on the same straight line.

7. The miniaturized duplexer according to claim 5, characterized in that: It also includes multiple tuning coupling screws; the tuning coupling screws are installed on one of the cover plates, and the inner ends of the tuning coupling screws penetrate the cover plate and are located in the corresponding tuning coupling region and the region between the outer wall of the filtering cavity corresponding to the output terminal and the outer conductor; The region between the outer wall of the filtering cavity corresponding to the output terminal and the outer conductor and each tuning coupling region correspond to one tuning coupling screw.

8. The miniaturized duplexer according to claim 2, characterized in that: The resonator, the coupling ring, and the L-shaped partition are integrally designed.

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