CN216903293U

CN216903293U - Dual-mode coupling structure, filter and communication equipment

Info

Publication number: CN216903293U
Application number: CN202220670371.0U
Authority: CN
Inventors: 许建军; 楼仲宇
Original assignee: Wuhan Fingu Electronic Technology Co Ltd
Current assignee: Wuhan Fingu Electronic Technology Co Ltd
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2022-07-05
Anticipated expiration: 2032-03-22

Abstract

The utility model discloses a dual-mode coupling structure, a filter and communication equipment. It includes the cavity and covers and establishes apron on the cavity, be equipped with at least two adjacent first resonant cavities and the second resonant cavity of arranging in the cavity, set up the bimodulus resonator of four ends ground connection of cross type in the first resonant cavity, set up single mode resonator in the second resonant cavity, it has first window to open on the chamber wall between first resonant cavity and the second resonant cavity, be equipped with coupling portion in the first window. The cross-shaped dual-mode dielectric resonator with the four grounded ends is adjacently arranged with the single-mode resonator, and the coupling part and the first window are arranged to generate a zero point.

Description

Dual-mode coupling structure, filter and communication equipment

Technical Field

The utility model belongs to the technical field of communication, and particularly relates to a dual-mode coupling structure, a filter and communication equipment.

Background

With the rapid development of mobile communication, satellite communication and radar technologies, the performance requirements of the microwave radio frequency field on components are higher and higher, and the filter can realize the passing of signals of a pass band and inhibit noises outside the frequency band, so that the noise performance of a communication system is directly influenced, and the filter is the center of many design problems in the microwave technology. However, the electromagnetic spectrum is limited, the frequency band of the existing microwave radio frequency field is already crowded, and in order to cope with the current situation that the frequency resources are increasingly strained, the filter needs to have better performance. Conventional metal cavity filters and single mode dielectric filters have not been able to meet these requirements, and therefore, it is desired to improve the performance and reduce the size of the filter by means of a dual mode dielectric filter. Compared with a filter consisting of single-mode resonators, the dual-mode dielectric filter has the advantages that the size, the weight and the number of resonators are greatly reduced under the same performance.

However, even if the dual-mode dielectric resonator is used, the harsh near-end rejection requirement may still not be satisfied, that is, electromagnetic waves with very close frequency intervals are required to be filtered, at this time, cross coupling needs to be introduced to implement a transmission zero point, but the conventional method for introducing the transmission zero point by using the dual-mode dielectric resonator has the following difficulties:

(1) because one resonator is used in two modes, the feeding and mutual coupling relation of the filter is difficult to control, transmission zero points which are difficult to adjust are easy to cause, and the introduced transmission zero points can generate a plurality of uncontrolled transmission zero points falling in a passband, so that the product function cannot be realized and the product becomes an unqualified product;

(2) the transmission zero point introduced by the double-mode or multi-mode dielectric filter is not adjustable, or the adjustment can generate interference on the existing resonant frequency.

Therefore, the conventional dual-mode dielectric filter (duplexer) is generally not designed with a transmission zero, and the dual-mode dielectric filter opened as in patent CN1113423C does not disclose generation of a zero.

Or a dual-mode dielectric filter generating zero points exists, but the product performance of the dual-mode dielectric filter has some defects, for example, the dual-mode dielectric filter disclosed in the patent PCTCN2016097586 discloses a structure generating two zero points at the high ends of two adjacent cross-shaped dual-mode resonators, but the structure requires a window with an angle of one degree in the horizontal or vertical direction, is difficult to process, and is inconvenient for multi-combination integration; the dual-mode dielectric filter disclosed in patent US7283022B2 discloses that two adjacent cross-shaped dual-mode resonators generate a pair of zeros, but the coupling is modified by increasing the length of the wire, and this structure will cause the near-end harmonic of the filter to be drastically deteriorated (see S parameter curve chart), and the wire length is long, the manufacturing is complicated, and the performance is not stable. Moreover, the PCTCN2016097586 and the US7283022B2 both disclose only two adjacent cross dual-mode zero generation, and do not disclose how the dual-mode and the single-mode generate zero, so that the design of the filter is limited, for example, to generate 3 zero, at least 4 dual-modes need to be added, and actually, the more the dual-mode is introduced, the higher the cost is, the worse the PIM3 is, and more times, the transmission zero between the dual-mode dielectric filter and the single-mode dielectric filter can be flexibly realized due to various condition limitations such as volume, cost or electrical index.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solve the above-mentioned drawbacks of the prior art, and provides a dual-mode coupling structure, a filter and a communication device with transmission zero, which are simple in structure, easy to process and assemble, and the designed filter with zero has flexible design of capacitive zero or inductive zero, easy to adjust, and stable performance.

The technical scheme adopted by the utility model is as follows: a dual-mode coupling structure comprises a cavity body and a cover plate covered on the cavity body, wherein at least two first resonant cavities and two second resonant cavities which are arranged adjacently are arranged in the cavity body, a cross-shaped dual-mode resonator with four grounded ends is arranged in the first resonant cavity, two ends of a horizontal arm of the dual-mode resonator are respectively connected with two side walls of the first resonant cavity, one end of a vertical arm of the dual-mode resonator is connected with the bottom surface of the first resonant cavity, the other end of the vertical arm of the dual-mode resonator is connected with the cover plate, a single-mode resonator is arranged in the second resonant cavity, and one end of the single-mode resonator is connected with the bottom surface of the second resonant cavity; a first window is formed in the cavity wall between the first resonant cavity and the second resonant cavity from the side edge to the middle, a coupling portion is arranged in the first window, one end of the coupling portion is connected with the side face of the first resonant cavity, the side face is a side wall which is connected with one end of the horizontal arm and is close to the first window, and the other end of the coupling portion is connected with the bottom face of the second resonant cavity.

Furthermore, the first resonant cavity is connected with a horizontal arm of the dual-mode resonator, a horizontal step extends out of the side wall close to the first window, and one end of the coupling part is fixed on the horizontal step through a bolt.

Furthermore, one end of the coupling part is fixed on the side surface of the first resonant cavity through welding, and the other end of the coupling part is fixed on the bottom surface of the second resonant cavity through welding.

Furthermore, a supporting step is arranged on the bottom surface of the second resonant cavity, and the other end of the coupling part is fixed on the supporting step through a bolt.

Further, the coupling part is a metal sheet or a metal wire or a surface-metalized non-metal sheet or a surface-metalized non-metal wire.

Further, the depth of the first window extends to the bottom surface of the cavity.

Furthermore, a second window is formed in the cavity wall from the other side edge to the middle.

Furthermore, at least one of the four ends of the dual-mode resonator is grounded through the transition section.

A filter comprising a dual-mode coupling structure as claimed in any one of the preceding claims.

A communication device comprising a filter as described above.

The cross-shaped dual-mode dielectric resonator with four grounded ends is adjacently configured with a single-mode resonator (a cavity or a TM (transverse magnetic) mode), meanwhile, a first window is formed in the public cavity wall, and a coupling part for connecting two resonant cavities is arranged in the first window, so that signal transposition (namely signal coupling between two mutually orthogonal modes in the horizontal directions of the single mode and the dual mode) is realized, meanwhile, the coupling is enhanced, a transmission zero point is generated, the structure is simple, out-of-band suppression can be improved, and the performance of a filter is improved; the depth and the width of the first window, the height of the coupling part to the ground and the like are adjusted, so that the coupling amount is adjusted. By controlling the coupling polarity of the structure for destroying the cross dual-mode orthogonal characteristic, the capacitive zero point or the inductive zero point can be flexibly realized, the structure is easy to process, the multi-path synthesis is convenient, the production consistency is good, and the PIM3 intermodulation is stable; the coupling part is fixed in a step form, and the coupling part is convenient to machine and assemble and high in reliability.

Drawings

Fig. 1 is a schematic perspective view of a dual-mode coupling structure according to the present invention (a cover plate is not shown).

Fig. 2 is a schematic plan view of the dual-mode coupling structure according to the present invention (the cover plate is not shown).

Fig. 3 is a simplified schematic diagram of the filtering of the present invention (some of the prior art structures are not shown).

In the figure, 1-chamber; 2-a first resonant cavity; 3-a second resonant cavity; a 4-dual mode resonator; 4.1-horizontal arm; 4.2-vertical arm; 5-a single mode resonator; 6-chamber wall; 7-a second window; 8-a first window; 9-a coupling part; 10-a horizontal step; 11-supporting a step; 12-an input connector; 13-output connector.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Other components (such as the input connector 12, the output connector 13, other resonant cavities and corresponding coupling structures, tuning screws, coupling screws, etc.) constituting the filter are not shown, but are not emphasized in the present patent, which is an existing structure.

The terms "first" and "second" as used herein are relative, not actual.

The terms "top" and "bottom" as used herein are also relative terms.

As shown in fig. 1-2, the present invention provides a dual-mode coupling structure, which includes a cavity 1 and a cover plate covering the cavity 1, wherein the cover plate is fixed above the cavity by a plurality of assembly screws to seal the cavity, and for convenience of showing the internal structure of the cavity, the cover plate is not shown in the drawings. At least two adjacent first resonant cavities 2 and second resonant cavities 3 are arranged in the cavity 1, and the first resonant cavities 1 and the second resonant cavities 2 are separated by cavity walls 6. A cross-shaped dual-mode resonator 4 with four grounded ends, which is composed of a horizontal arm 4.1 and a vertical arm 4.2, is arranged in the first resonant cavity 1, and a coupling structure for destroying the dual-mode orthogonal characteristic is arranged in the first resonant cavity; and/or a coupling structure which destroys the dual-mode orthogonal characteristic is arranged on the dual-mode resonator. In this embodiment, the coupling structure for destroying the orthogonal characteristic is implemented by slotting in the center of the dual-mode resonator 4, or slotting at the junction of the horizontal wall or the vertical wall of the dual-mode resonator, or by arranging a step or an oblique angle at the junction of the side surface and the bottom surface of the first resonant cavity, and the polarity of the coupling structure for destroying the orthogonal characteristic of the dual modes determines the polarity of the generated zero point, that is, determines whether a capacitive zero point or an inductive zero point is generated. Preferably, the four ends of the dual-mode resonator 4 can be directly grounded, or at least one of the four ends is grounded through a transition section, the transition section can be a surface-metalized or metal elastic sheet or spring or grounding ring, or can be a support seat made of PEI or PTFE material, so that the product can meet the use requirements of severe environments such as high temperature, low temperature and the like, and the reliability of the product is improved. Two ends of a horizontal arm 4.1 of the dual-mode resonator 4 are respectively connected with two side walls 2.1 of the first resonant cavity 2, the two side walls 2.1 are both side walls vertical to the cavity wall 6, one end of a vertical arm 4.2 of the dual-mode resonator 4 is connected with the bottom surface 2.1 of the first resonant cavity 2, and the other end of the vertical arm is connected with the cover plate. A single-mode resonator 5 is arranged in the second resonant cavity 3, the single-mode resonator 5 may be a cavity single-mode resonator, such as a TM single-ended ground single-mode resonator or a TM double-ended ground single-mode resonator or a metal resonator (the single-mode resonator 5 may also include a metal step with a certain height at the bottom), one end of the single-mode resonator 5 is connected to the bottom surface 3.1 of the second resonant cavity 3, and the other end of the single-mode resonator 5 may be connected to a cover plate or spaced from the cover plate by a certain distance according to the type of the resonator.

In the above scheme, a first window 8 is formed on the cavity wall 6 between the first resonant cavity 2 and the second resonant cavity 3 from the side edge to the middle, a coupling portion 9 is arranged in the first window 8, and preferably, the depth of the first window 8 extends to the bottom surface of the cavity 1. One end of the coupling part 9 is connected with the side surface of the first resonant cavity 3, and the side surface is a side wall which is connected with one end of the horizontal arm 4.1 and is close to the first window 8, namely, one end of the coupling part 9 is close to the horizontal arm 4.1 and is far away from the vertical arm 4.2; the other end of the coupling section 9 is connected to the bottom surface of the second resonator 3 close to the single-mode resonator 5, and the coupling section 9 may be in contact with the single-mode resonator 5. The coupling section 9 can realize signal transposition (i.e., signal coupling between two mutually orthogonal modes of a single mode and a dual-mode horizontal direction) while enhancing the coupling thereof.

The cross-shaped dual-mode dielectric resonator with the four grounded ends is arranged adjacent to a single-mode resonator, meanwhile, a first window is formed in the public cavity wall, and the coupling part for connecting the two resonant cavities is arranged in the first window, so that signal transposition (namely signal coupling between the two orthogonal modes in the horizontal direction of the single mode and the dual mode) is realized, a zero point is generated, the structure is simpler, the production cost of the filter is reduced, the service performance of the filter is effectively improved, and the practicability of the filter is improved.

In the above scheme, a second window 7 is formed on the cavity wall 6 from the other side edge to the middle, the depth of the second window 7 is smaller than that of the first window 8, the depth refers to the length extending from the top end of the cavity wall to the bottom surface of the cavity along the direction perpendicular to the cover plate, that is, the first window and the second window are both notches formed on the cavity wall by sinking from the top surface thereof. The adjustment of the coupling amount between the two resonators is realized by reasonably setting the depth of the first window 8 and the second window 7, for example, the depth of the second window 7 can be 1/3-2/3 times of the height of the cavity wall, and the depth of the first window 8 can be 1/2-1 times of the height of the cavity wall.

In the above solution, two ends of the coupling portion 9 may be fixedly connected to the side surface of the first resonant cavity and the bottom surface of the second resonant cavity by welding. For convenience of processing and assembly, convenience of multipath synthesis and good production consistency, PIM3 is stable in intermodulation, the coupling part 9 is fixed in a bottom step mode, for example, a horizontal step 10 transversely extends towards the middle of the cavity from the side wall connected with the horizontal arm 4.1 of the dual-mode resonator 4, one end of the coupling part 9 is fixed on the horizontal step 10 through a bolt, and the horizontal step 10 can be in contact with the bottom surface of the first resonant cavity 2 or be spaced at a certain distance. The bottom surface of the second resonant cavity 3 is provided with a supporting step 11, the other end of the coupling part 9 is fixed on the supporting step 11 through a bolt, and the supporting step 11 can be in contact with the single-mode resonator 5 or be spaced at a certain distance.

In the above-described embodiment, the coupling portion 9 is a metal sheet or a metal wire or a surface-metalized non-metal sheet or a surface-metalized non-metal wire, and the metal material may be a conductive material such as copper or aluminum, but not limited thereto, and may be a conductive material formed by plating silver or copper on the surface of a medium. The coupling portion 9 may be a straight line when disposed, or may be bent according to the width of the first window 8 and the arrangement positions of the horizontal step 10 and the support step 11.

The present invention also provides a filter comprising a dual-mode coupling structure as described above, as shown in fig. 3. Besides the first resonant cavity and the second resonant cavity, the cavity 1 may further include other resonant cavities of any form and corresponding coupling structures (both existing structures and not shown), and the filter may be any type of filter, and may also be a duplexer or a multiplexer.

The utility model also provides a communication device, such as a base station, transceiver, transmitter or receiver, comprising a filter as described above.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.

Claims

1. A bimodulus coupling structure, includes cavity (1) and covers the apron of establishing on the cavity, be equipped with at least two adjacent first resonant cavity (2) and the second resonant cavity (3) of arranging in cavity (1), its characterized in that: a cross-shaped dual-mode resonator (4) with four grounded ends is arranged in the first resonant cavity (2), two ends of a horizontal arm of the dual-mode resonator (4) are respectively connected with two side walls of the first resonant cavity (2), one end of a vertical arm of the dual-mode resonator (4) is connected with the bottom surface of the first resonant cavity (2), the other end of the vertical arm of the dual-mode resonator is connected with a cover plate, a single-mode resonator (5) is arranged in the second resonant cavity (3), and one end of the single-mode resonator (5) is connected with the bottom surface of the second resonant cavity (3); a first window (8) is formed in the cavity wall (6) between the first resonant cavity (2) and the second resonant cavity (3) from the side edge to the middle, a coupling portion (9) is arranged in the first window (8), one end of the coupling portion (9) is connected with the side face of the first resonant cavity (2), the side face is a side wall which is connected with one end of the horizontal arm (4.1) and is close to the first window (8), and the other end of the coupling portion (9) is connected with the bottom face of the second resonant cavity (3).

2. The dual-mode coupling structure of claim 1, wherein: the first resonant cavity (2) is connected with a horizontal arm of the dual-mode resonator, a horizontal step (10) extends out of the side wall close to the first window (8), and one end of the coupling part (9) is fixed on the horizontal step (10) through a bolt.

3. The dual-mode coupling structure of claim 1, wherein: one end of the coupling part (9) is fixed on the side surface of the first resonant cavity (2) through welding, and the other end of the coupling part is fixed on the bottom surface of the second resonant cavity (3) through welding.

4. The dual-mode coupling structure of claim 1, wherein: the bottom surface of the second resonant cavity (3) is provided with a supporting step (11), and the other end of the coupling part (9) is fixed on the supporting step (11) through a bolt.

5. The dual-mode coupling structure of claim 1, wherein: the coupling part (9) is a metal sheet or a metal wire or a non-metal sheet with a metalized surface or a non-metal wire with a metalized surface.

6. The dual-mode coupling structure of claim 1, wherein: the depth of the first window (8) extends to the bottom surface of the cavity.

7. The dual-mode coupling structure of claim 1, wherein: a second window (7) is arranged on the cavity wall (6) from the other side edge to the middle.

8. The dual-mode coupling structure of claim 1, wherein: at least one of the four ends of the dual-mode resonator is grounded through a transition section.

9. A filter, characterized by: comprising a dual-mode coupling structure according to any of claims 1 to 8.

10. A communication device, characterized by: comprising a filter according to claim 9.