CN216488429U - Multiplexer - Google Patents

Abstract

The utility model relates to a radio frequency device field provides a multiplexer, including casing, a plurality of filtering branch roads, sharing connector and coupling piece. The working frequency bands of the filtering branches are different; the shared connector is arranged on the outer side of the shell, and one side of the shared connector is provided with a shared coupling rod penetrating through the shell; the coupling piece is connected to the end part of the shared coupling rod, and the coupling piece is in capacitive coupling with the first filtering cavities of one part of the filtering branches and is in inductive coupling with the first filtering cavities of the other part of the filtering branches. Based on the structure, each filtering branch can be compacted near the shared connector, and the occupied space of each filtering branch is compacted and reduced; on the basis of ensuring the reliability of signal transmission between the common connector and the first filtering cavity of each filtering branch, each filtering branch can be connected with the antenna by the common connector to feed in or feed out signals, so that the use amount of the connector of each filtering branch and cables between each filtering branch and the antenna can be reduced, and the cost can be reduced.

Description

Multiplexer

Technical Field

The utility model belongs to the technical field of the radio frequency device, especially, relate to a multiplexer.

Background

In a mobile communication base station system, a communication signal of a specific frequency range is generally transmitted through a transmitting antenna, and a communication signal of a specific frequency range is received through a receiving antenna. While clutter signals and interference signals outside a particular frequency range may be filtered out by a filter. Therefore, the antenna is often connected with a plurality of filters corresponding to different working frequency bands through a plurality of cables, so that the overall occupied space of each filter is inevitably large, the use amount of the cables is also large, and the cost is high.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a multiplexer to solve prior art, the antenna needs correspond the numerous wave filters of different working frequency channels through numerous cable junction, leads to the great, the more technical problem of cable use amount of the whole occupation space of each wave filter.

In order to achieve the above object, the utility model adopts the following technical scheme: a multiplexer, comprising:

a housing;

the filtering branches are all arranged on the shell and comprise a plurality of filtering cavities which are coupled in sequence, and the working frequency ranges of the filtering branches are different;

the shared connector is arranged on the outer side of the shell, and a shared coupling rod penetrating through the shell is arranged on one side of the shared connector;

and the coupling piece is connected to the end part of the shared coupling rod, is capacitively coupled with the first filter cavity of one part of the filter branches and is inductively coupled with the first filter cavity of the other part of the filter branches.

In one embodiment, there are three filtering branches, and the three filtering branches are respectively:

the first filtering branch comprises eight filtering cavities which are sequentially coupled, and the working frequency band of the first filtering branch is 1780MHz-2100 MHz;

the second filtering branch comprises seven filtering cavities which are sequentially coupled, and the working frequency range of the second filtering branch is 890-1050 MHz;

the third filtering branch comprises six filtering cavities which are sequentially coupled, and the working frequency range of the third filtering branch is 593MHz-700 MHz;

the coupling piece is capacitively coupled with the first filter cavity of the first filter branch and is inductively coupled with the first filter cavity of the second filter branch and the first filter cavity of the third filter branch.

In one embodiment, each filter cavity is provided with a resonance rod; the coupling piece with the resonance rod in the first filtering cavity of first filtering branch road sets up and the interval sets up relatively, the coupling piece difference lug connection the resonance rod in the first filtering cavity of second filtering branch road and the resonance rod in the first filtering cavity of third filtering branch road.

In one embodiment, each filter cavity is provided with a resonance rod; each resonance rod of the first filtering branch is integrally connected to the shell, and each resonance rod of the second filtering branch and each resonance rod of the third filtering branch are connected to the shell through fasteners respectively.

In one embodiment, the second filtering branch and the third filtering branch are arranged side by side on one side of the first filtering branch, and the first filtering cavity of the second filtering branch and the first filtering cavity of the third filtering branch are arranged on one side close to the first filtering branch.

In one embodiment, the filter cavities of the second filter branch are sequentially arranged in a column along a direction away from the first filter branch;

and all the filter cavities of the third filter branch circuit are sequentially arranged in a row along the direction far away from the first filter branch circuit.

In one embodiment, the first filter cavities and the second filter cavities of the first filter branch are sequentially arranged in a column along a direction close to the second filter branch;

the fourth filtering cavity, the fifth filtering cavity, the sixth filtering cavity, the seventh filtering cavity and the eighth filtering cavity A8 of the first filtering branch are sequentially arranged in a row along the direction far away from the second filtering branch;

and the second filtering cavity, the third filtering cavity and the fourth filtering cavity of the first filtering branch are arranged in a triangular mode.

In one embodiment, coupling ribs are arranged between the first filter cavity and the second filter cavity of the second filter branch, and between the sixth filter cavity and the seventh filter cavity of the second filter branch;

and coupling ribs are arranged between the adjacent filtering cavities of the third filtering branch.

In one embodiment, the multiplexer further includes a plurality of branch connectors, the set number of the branch connectors corresponds to the set number of the filtering branches, and the plurality of branch connectors are respectively connected to last filtering cavities of the plurality of filtering branches;

wherein the branch connector is capacitively coupled with a last filter cavity of the filter branch when a first filter cavity of the filter branch is capacitively coupled with the coupling tab;

when the first filter cavity of the filter branch circuit is inductively coupled with the coupling piece, the branch circuit connector is inductively coupled with the tail filter cavity of the filter branch circuit.

In one embodiment, each filter cavity is provided with a resonance rod; when the branch connector is capacitively coupled with the tail filter cavity of the filter branch, a coupling structure is arranged on one side of the resonance rod of the tail filter cavity of the filter branch, the coupling structure is provided with a through hole formed along the axial extension of the resonance rod, and a branch coupling rod penetrating the through hole is arranged on one side of the branch connector;

when the branch connector is inductively coupled with the tail filter cavity of the filter branch, a branch coupling rod penetrating to the resonance rod along the radial direction of the resonance rod is arranged on one side of the branch connector.

The utility model provides a beneficial effect lies in:

the embodiment of the utility model provides a multiplexer, accessible common connector are via coupling pole coupling connection coupling piece, the coupling piece of rethread and the first filtering chamber capacitive coupling of partly filtering branch road, with the first filtering chamber perceptual coupling of another part filtering branch road to on effectively weakening the basis of the signal interference degree between the two parts filtering branch road, realize combining the different filtering branch roads of a plurality of operating frequency channels to same common connector on. Based on the above, the filtering branches can be made compact near the common connector, so that the layout of the filtering branches is made compact and optimized, and the occupied space of the filtering branches is made compact and reduced; on the basis of ensuring the reliability of signal transmission between the common connector and the first filtering cavity of each filtering branch and the electrical performance of each filtering branch, each filtering branch can be prompted to use the same common connector to connect equipment such as an antenna and the like so as to feed in or feed out signals, so that the number of the connectors of each filtering branch can be effectively reduced, the use amount of cables between each filtering branch and the antenna can be effectively reduced, and the cost can be further reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic perspective view of a multiplexer according to an embodiment of the present invention;

fig. 2 is a top view of a multiplexer according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a partial structure of a multiplexer according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the resonant beam and branch connector of the eighth filter cavity A8 of the first filter branch provided in FIG. 3;

fig. 5 is an equivalent circuit schematic diagram of the first filtering branch, the second filtering branch and the third filtering branch provided by the embodiment of the present invention;

fig. 6 is a simulation waveform diagram of the first filtering branch, the second filtering branch and the third filtering branch provided by the embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

10-a housing; 20-a filtering branch, 21-a first filtering branch, 22-a second filtering branch, 23-a third filtering branch, 24-a resonant rod, 25-a coupling rib, 26-a coupling structure and 261-a through hole; 30-common connector, 31-common coupling rod; 40-a coupling tab; 50-branch connector, 51-branch coupling rod.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The following describes the specific implementation of the present invention in more detail with reference to specific embodiments:

referring to fig. 1, 2 and 3, an embodiment of the present invention provides a multiplexer, which includes a housing 10, a plurality of filtering branches 20, a common connector 30 and a coupling piece 40. The plurality of filtering branches 20 are all arranged on the shell 10, each filtering branch 20 comprises a plurality of filtering cavities which are coupled in sequence, and the working frequency ranges of the filtering branches 20 are different; the common connector 30 is arranged outside the shell 10, and one side of the common connector 30 is provided with a common coupling rod 31 penetrating through the shell 10; the coupling tab 40 is connected to the end of the common coupling rod 31, and the coupling tab 40 is capacitively coupled to the first filter cavity (refer to a drawing a1) of one part of the filter branches 20 and is inductively coupled to the first filter cavity (refer to drawings B1 and C1) of the other part of the filter branches 20.

It should be noted that the number of the filter branches 20 is two or more, and the number of the filter cavities included in each filter branch 20 and the coupling manner of the filter cavities are not completely the same, so that each filter branch 20 has different operating frequency bands. Based on this, each filtering branch 20 can respectively allow the communication signal in its working frequency band to transmit and pass through, and correspondingly filter out clutter signals and interference signals outside its working frequency band.

It should be noted that the first filter cavities of the filter branches 20 are commonly connected to the same common connector 30, and therefore, the filter branches 20 can be compacted near the common connector 30 to compact the overall layout and volume of the multiplexer; each filtering branch 20 can be connected with an antenna or other equipment by means of the same common connector 30 to feed in or feed out signals, so that the number of connectors of each filtering branch 20 can be effectively reduced, the use amount of cables between each filtering branch 20 and the antenna can be effectively reduced, and further, the cost can be reduced.

According to the working frequency band of each filtering branch 20, each filtering branch 20 can be divided into two parts, the mutual influence between the filtering branches 20 divided into the same part is not large, then, the shared connector 30 can be coupled with the coupling piece 40 through the shared coupling rod 31, and then is capacitively coupled with the first filtering cavity of one part of the filtering branches 20 through the coupling piece 40 and is inductively coupled with the first filtering cavity of the other part of the filtering branches 20, so that the mutual influence degree between the two parts of the filtering branches 20 can be effectively weakened, the signal interference degree can be weakened, and the reliability of signal transmission between the shared connector 30 and the first filtering cavity of each filtering branch 20 can be further ensured.

To sum up, the embodiment of the utility model provides a multiplexer, accessible common connector 30 are via coupling pole coupling connection coupling piece 40, and the coupling piece 40 is coupled with the first filtering chamber capacitive coupling of partly filtering branch road 20 to rethread, with the first filtering chamber inductive coupling of another part filtering branch road 20 to on the basis of the signal interference degree between effectively weakening two parts filtering branch road 20, realize combining the different filtering branch roads 20 of a plurality of operating frequency channels to same common connector 30 on. Based on this, each filtering branch 20 can be made compact near the common connector 30, so as to compact and optimize the layout of each filtering branch 20, and compact and reduce the occupied space of each filtering branch 20; on the basis of ensuring the reliability of signal transmission between the common connector 30 and the first filter cavity of each filter branch 20 and the electrical performance of each filter branch 20, each filter branch 20 can be prompted to use the same common connector 30 to connect devices such as an antenna and the like to feed in or feed out signals, so that the number of the connectors of each filter branch 20 can be effectively reduced, the use amount of cables between each filter branch 20 and the antenna can be effectively reduced, and the cost can be further reduced.

In addition, the multiplexer has the advantages of regular structure, good consistency, suitability for batch production and higher production efficiency.

Referring to fig. 1, fig. 2, and fig. 3, in the present embodiment, the multiplexer further includes a plurality of branch connectors 50, the set number of the branch connectors 50 corresponds to the set number of the filter branches 20, and the plurality of branch connectors 50 are respectively connected to last filter cavities of the plurality of filter branches 20 (i.e. the last filter cavity most distant from the first filter cavity according to the coupling relationship, refer to diagrams A8, B7, and C6); wherein, when the first filter cavity of the filter branch 20 is capacitively coupled with the coupling tab 40, the branch connector 50 is capacitively coupled with the last filter cavity (refer to the illustration A8) of the filter branch 20; when the first filter cavity of the filter branch 20 is inductively coupled to the coupling patch 40, the branch connector 50 is inductively coupled to the last filter cavity (refer to fig. B7 and C6) of the filter branch 20.

On this basis, when the common connector 30 is used for feeding signals, each filtering branch 20 can feed signals out through the branch connector 50 connected to its last filtering cavity; conversely, when the common connector 30 is used for feeding out signals, each filtering branch 20 can be fed with signals through the branch connector 50 connected to its last filtering cavity.

In addition, in the same filtering branch 20, the coupling polarity between the last filtering cavity of the filtering branch 20 and the branch connector 50 is the same as the coupling polarity between the first filtering cavity of the filtering branch 20 and the coupling tab 40, so that the signal interference degree between the filtering branches 20 divided into two parts can be further weakened, the reliability of signal transmission between each branch connector 50 and the corresponding filtering branch 20 can be further ensured, and the electrical performance of the filtering branch 20 can be further ensured.

Referring to fig. 2, 3 and 4, in the present embodiment, each filter cavity is provided with a resonant rod 24.

When the branch connector 50 is capacitively coupled with the last filter cavity (refer to A8 in the figure) of the filter branch 20, the last filter cavity of the filter branch 20 is provided with the coupling structure 26 at one side of the resonant rod 24 thereof, the coupling structure 26 is provided with a through hole 261 formed along the axial extension of the resonant rod 24, and the branch coupling rod 51 inserted into the through hole 261 is provided at one side of the branch connector 50. Based on this, the branch coupling rod 51 of the branch connector 50 can be capacitively coupled with the coupling structure 26 and the resonance rod 24 connected with the coupling structure 26 by being inserted into the through hole 261, so as to reliably transmit signals between the branch connector 50 and the last filter cavity of the corresponding filter branch 20.

The coupling strength between the branch coupling rod 51 and the coupling structure 26 and between the branch coupling rod 51 and the resonance rod 24 connected to the coupling structure 26 can be adjusted by adjusting the length of the branch coupling rod 51 penetrating into the through hole 261 and/or adjusting the thickness of the branch coupling rod 51.

The end of the branch coupling rod 51 penetrating through the through hole 261 is sleeved with a dielectric sleeve (not shown in the figure), the dielectric sleeve can be made of a material with a dielectric constant of 2.1, and the dielectric sleeve can be used for blocking charge movement between the branch coupling rod 51 and the coupling structure 26, so that charges can be accumulated on the branch coupling rod 51 and the coupling structure 26, and further capacitance can be increased, and a coupling effect between the branch coupling rod 51 and the coupling structure 26 can be guaranteed and strengthened.

When the branch connector 50 is inductively coupled to the last filter cavity (refer to fig. B7 and C6) of the filter branch 20, a branch coupling rod 51 penetrating to the resonance bar 24 in a radial direction of the resonance bar 24 is provided at one side of the branch connector 50. Based on this, the branch coupling rod 51 of the branch connector 50 can be directly connected to the resonance rod 24 to be inductively coupled with the resonance rod 24, thereby achieving reliable signal transmission between the branch connector 50 and the last filter cavity of the corresponding filter branch 20.

Referring to fig. 1, fig. 2, and fig. 3, in the present embodiment, three filtering branches 20 are provided, and the three filtering branches 20 are a first filtering branch 21, a second filtering branch 22, and a third filtering branch 23. The first filtering branch 21 comprises eight filtering cavities which are coupled in sequence, and the working frequency band of the first filtering branch 21 is 1780MHz-2100 MHz; the second filtering branch 22 comprises seven filtering cavities which are coupled in sequence, and the working frequency band of the second filtering branch 22 is 890-1050 MHz; the third filtering branch 23 comprises six filtering cavities coupled in sequence, and the working frequency band of the third filtering branch 23 is 593MHz-700 MHz; the coupling plate 40 is capacitively coupled to the first filter cavity a1 of the first filter branch 21 and is inductively coupled to the first filter cavity B1 of the second filter branch 22 and the first filter cavity C1 of the third filter branch 23.

Specifically, the coupling plate 40 is disposed opposite to and spaced apart from the resonant bar 24 of the first filter cavity a1 of the first filter branch 21 to be capacitively coupled with the resonant bar 24 of the first filter cavity a1 of the first filter branch 21, wherein the adjustment of the coupling strength therebetween can be realized by adjusting the relative area of the coupling plate 40 and the resonant bar 24 of the first filter cavity a1 of the first filter branch 21.

The coupling plate 40 is further directly connected to the resonant rod 24 of the first filter cavity B1 of the second filter branch 22 and the resonant rod 24 of the first filter cavity C1 of the third filter branch 23, respectively, so as to be inductively coupled to the resonant rod 24 of the first filter cavity B1 of the second filter branch 22 and the resonant rod 24 of the first filter cavity C1 of the third filter branch 23, respectively.

Based on this, the multiplexer can combine the first filtering branch 21 with the working frequency band of 1780MHz-2100MHz, the second filtering branch 22 with the working frequency band of 890MHz-1050MHz, and the first filtering cavity a1, B1, C1 of the third filtering branch 23 with the working frequency band of 593MHz-700MHz onto the common connector 30 on the basis of weakening the signal interference of the first filtering branch 21, the second filtering branch 22, and the third filtering branch 23, so as to correspondingly reduce the number of connectors on the basis of ensuring the filtering performance and the electrical performance of the first filtering branch 21, the second filtering branch 22, and the third filtering branch 23, and then the usage amount of cables between the multiplexer and the antenna is continuously reduced, thereby ensuring and improving the performance of the multiplexer, and reducing the cost of the multiplexer.

Correspondingly, three branch connectors 50 are provided, a first branch connector 50 is capacitively coupled to the eighth filter cavity A8, which is the last filter cavity of the first filter branch 21, a second branch connector 50 is inductively coupled to the seventh filter cavity B7, which is the last filter cavity of the second filter branch 22, and a third branch connector 50 is inductively coupled to the sixth filter cavity C6, which is the last filter cavity of the third filter branch 23. For the implementation of the branch connector 50 and the corresponding end filter cavity to implement the capacitive coupling or the inductive coupling, reference may be made to the above embodiments, and repeated description is not repeated herein.

Referring to fig. 1, 2 and 3, in the present embodiment, each resonant rod 24 of the first filtering branch 21 is integrally connected to the housing 10, so that the assembly of the first filtering branch 21 is facilitated, and the cost of the multiplexer is reduced.

The resonant rods 24 of the second filtering branch 22 and the third filtering branch 23 are respectively connected to the housing 10 through fasteners (not shown in the figure), so that the frequencies of the resonant rods 24 of the second filtering branch 22 and the third filtering branch 23 can be guaranteed, and the temperature drift of the resonant rods 24 of the second filtering branch 22 and the third filtering branch 23 can be reduced.

Referring to fig. 1, fig. 2, and fig. 3, in the present embodiment, the second filtering branch 22 and the third filtering branch 23 are disposed side by side on one side of the first filtering branch 21, and the first filtering cavity B1 of the second filtering branch 22 and the first filtering cavity C1 of the third filtering branch 23 are disposed on one side close to the first filtering branch 21.

By adopting the above scheme, on the basis of ensuring the reliability of signal transmission of the first filtering branch 21, the second filtering branch 22 and the third filtering branch 23, the layout of the first filtering branch 21, the second filtering branch 22 and the third filtering branch 23 can be relatively compacted, normalized and optimized, and the occupied space of the first filtering branch 21, the second filtering branch 22 and the third filtering branch 23 can be correspondingly compacted and reduced. Thereby ensuring and improving the service performance of the multiplexer.

Referring to fig. 1, fig. 2, and fig. 3, in the present embodiment, the filter cavities of the second filter branch 22 are sequentially arranged in a row along a direction away from the first filter branch 21; the filter cavities of the third filter branch 23 are arranged in a row in sequence along the direction away from the first filter branch 21.

By adopting the above scheme, the layout of the second filtering branch 22 and the third filtering branch 23 can be normalized and optimized, and the coupling sheet 40 can be conveniently inductively coupled with the first filtering cavity B1 of the second filtering branch 22 and the first filtering cavity C1 of the third filtering branch 23, so that the use performance of the multiplexer can be ensured and improved.

Referring to fig. 1, fig. 2 and fig. 3, in the present embodiment, the first filter cavity a1 and the second filter cavity a2 of the first filter branch 21 are sequentially arranged in a row along a direction close to the second filter branch 22; the fourth filter cavity a4, the fifth filter cavity a5, the sixth filter cavity a6, the seventh filter cavity a7 and the eighth filter cavity A8 of the first filter branch 21 are sequentially arranged in a row along a direction away from the second filter branch 22; the second filter cavity a2, the third filter cavity A3 and the fourth filter cavity a4 of the first filter branch 21 are arranged in a triangle.

By adopting the above scheme, the layout of the first filtering branch 21 can be compacted, normalized and optimized, the occupied space of the first filtering branch 21 can be compacted and reduced, and the coupling sheet 40 is convenient for capacitively coupling the first filtering cavity a1 of the first filtering branch 21, so that the use performance of the multiplexer can be ensured and improved.

Referring to fig. 2 and 3, in the present embodiment, coupling ribs 25 are disposed between the first filtering cavity B1 and the second filtering cavity B2 of the second filtering branch 22, and between the sixth filtering cavity B6 and the seventh filtering cavity B7; coupling ribs 25 are arranged between adjacent filter cavities (i.e. C1, C2, C3, C4, C5 and C6) of the third filter branch 23.

It should be noted here that the coupling between the coupled filter cavities of any of the filter branches 20 is realized by an opened coupling window. On the basis, the embodiment further arranges coupling ribs 25 between the first filter cavity B1 and the second filter cavity B2 of the second filter branch 22 and between the sixth filter cavity B6 and the seventh filter cavity B7, and between the sequentially coupled filter cavities of the third filter branch 23, so as to directly connect and couple the resonant rods 24 of the two filter cavities through the coupling ribs 25, thereby strengthening the coupling strength therebetween.

In addition, as shown in fig. 5, the present embodiment further provides an equivalent circuit schematic diagram of the first filtering branch 21, the second filtering branch 22 and the third filtering branch 23. Wherein different coupling relationships can be converted into different equivalent resistances. Specifically, the sequential coupling relationship between the filter cavities of the first filter branch 21 is converted into an equivalent resistor R11, the capacitive coupling relationship between the first filter cavity a1 of the first filter branch 21 and the common connector 30 is converted into an equivalent resistor R12, and the capacitive coupling relationship between the eighth filter cavity a8 of the first filter branch 21 and the branch connector 50 is converted into an equivalent resistor R13; the sequential coupling relationship between the filter cavities of the second filter branch 22 is converted into an equivalent resistor R21, the inductive coupling relationship between the first filter cavity B1 of the second filter branch 22 and the common connector 30 is converted into an equivalent resistor R22, and the inductive coupling relationship between the seventh filter cavity of the second filter branch 22 and the branch connector 50 is converted into an equivalent resistor R23; the sequential coupling relationship between the filter cavities of the third filter branch 23 is converted into an equivalent resistor R31, the inductive coupling relationship between the first filter cavity C1 of the third filter branch 23 and the common connector 30 is converted into an equivalent resistor R32, and the inductive coupling relationship between the sixth filter cavity of the third filter branch 23 and the branch connector 50 is converted into an equivalent resistor R33; the impedance at the common connector 30 and each branch connector 50 is about 50 ohms, and the common connector 30 and each branch connector 50 are provided with an impedance adjuster, respectively, in order to achieve impedance matching.

In addition, as shown in fig. 6, the present embodiment further provides a simulated waveform diagram of the first filtering branch 21, the second filtering branch 22 and the third filtering branch 23. As can be seen from the simulated waveform diagram, the multiplexer provided in the embodiment has better filtering performance and electrical performance.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention, which is intended to cover any modifications, equivalent substitutions or improvements made within the spirit and scope of the present invention.

Claims (10)

1. A multiplexer, comprising:

a housing;

the filtering branches are all arranged on the shell and comprise a plurality of filtering cavities which are coupled in sequence, and the working frequency ranges of the filtering branches are different;

the shared connector is arranged on the outer side of the shell, and a shared coupling rod penetrating through the shell is arranged on one side of the shared connector;

and the coupling piece is connected to the end part of the common coupling rod, is capacitively coupled with the first filter cavity of one part of the filter branches and is inductively coupled with the first filter cavity of the other part of the filter branches.

2. The multiplexer of claim 1, wherein there are three of said filtering branches, and each of said three filtering branches is:

the first filtering branch comprises eight filtering cavities which are sequentially coupled, and the working frequency band of the first filtering branch is 1780MHz-2100 MHz;

the second filtering branch comprises seven filtering cavities which are sequentially coupled, and the working frequency band of the second filtering branch is 890-1050 MHz;

the third filtering branch comprises six filtering cavities which are sequentially coupled, and the working frequency range of the third filtering branch is 593MHz-700 MHz;

the coupling piece is capacitively coupled with the first filter cavity of the first filter branch and is inductively coupled with the first filter cavity of the second filter branch and the first filter cavity of the third filter branch.

3. The multiplexer of claim 2, wherein each of said filter cavities is provided with a resonant rod; the coupling piece with the resonance rod in the first filtering cavity of first filtering branch road sets up and the interval sets up relatively, the coupling piece difference lug connection the resonance rod in the first filtering cavity of second filtering branch road and the resonance rod in the first filtering cavity of third filtering branch road.

4. The multiplexer of claim 2, wherein each of said filter cavities is provided with a resonant rod; each resonance rod of the first filtering branch is integrally connected to the shell, and each resonance rod of the second filtering branch and each resonance rod of the third filtering branch are connected to the shell through fasteners respectively.

5. The multiplexer of claim 2, wherein the second filtering branch and the third filtering branch are disposed side by side on a side of the first filtering branch, and the first filtering cavity of the second filtering branch and the first filtering cavity of the third filtering branch are disposed on a side adjacent to the first filtering branch.

6. The multiplexer of claim 5, wherein said filter cavities of said second filter branch are arranged in a row in sequence in a direction away from said first filter branch;

the filter cavities of the third filter branch are sequentially arranged in a row along the direction far away from the first filter branch.

7. The multiplexer of claim 5, wherein the first filter cavities and the second filter cavities of the first filter branch are arranged in a row in sequence along a direction adjacent to the second filter branch;

the fourth filtering cavity, the fifth filtering cavity, the sixth filtering cavity, the seventh filtering cavity and the eighth filtering cavity A8 of the first filtering branch are sequentially arranged in a row along the direction far away from the second filtering branch;

and the second filtering cavity, the third filtering cavity and the fourth filtering cavity of the first filtering branch are arranged in a triangular mode.

8. The multiplexer of claim 2, wherein coupling ribs are disposed between the first filter cavity and the second filter cavity of the second filter branch, and between the sixth filter cavity and the seventh filter cavity;

and coupling ribs are arranged between the adjacent filtering cavities of the third filtering branch.

9. The multiplexer of any one of claims 1-8, wherein the multiplexer further comprises a plurality of branch connectors, the set number of branch connectors corresponding to the set number of filtering branches, the plurality of branch connectors respectively connecting to last filtering cavities of the plurality of filtering branches;

wherein the branch connector is capacitively coupled with a last filter cavity of the filter branch when a first filter cavity of the filter branch is capacitively coupled with the coupling tab;

when the first filter cavity of the filter branch circuit is inductively coupled with the coupling piece, the branch circuit connector is inductively coupled with the tail filter cavity of the filter branch circuit.

10. The multiplexer of claim 9, wherein each of said filter cavities is provided with a resonant rod; when the branch connector is capacitively coupled with the tail filter cavity of the filter branch, a coupling structure is arranged on one side of the resonance rod of the tail filter cavity of the filter branch, the coupling structure is provided with a through hole formed along the axial extension of the resonance rod, and a branch coupling rod penetrating the through hole is arranged on one side of the branch connector;

when the branch connector is inductively coupled with the last filter cavity of the filter branch, a branch coupling rod which penetrates through the resonance rod along the radial direction of the resonance rod is arranged on one side of the branch connector.

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