CN210723304U - Filter and topology - Google Patents
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- CN210723304U CN210723304U CN201921441848.2U CN201921441848U CN210723304U CN 210723304 U CN210723304 U CN 210723304U CN 201921441848 U CN201921441848 U CN 201921441848U CN 210723304 U CN210723304 U CN 210723304U
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Abstract
The utility model discloses a topological structure of a filter, which comprises a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity and a sixth resonant cavity, wherein the first resonant cavity is provided with an input port which is used for being coupled with an input unit; the first resonant cavity, the second resonant cavity, the third resonant cavity and the fourth resonant cavity are sequentially coupled and connected, and the fourth resonant cavity is coupled and connected with the first resonant cavity; the fourth resonant cavity, the third resonant cavity, the fifth resonant cavity and the sixth resonant cavity are sequentially coupled; the first resonant cavity is coupled with the third resonant cavity; the sixth resonant cavity is provided with an output port, and the output port is used for being coupled with an output unit. The utility model also discloses a wave filter. By the mode, the actual arrangement mode of the elements of the filter can be more flexible under the condition of meeting the performance of the filter.
Description
Technical Field
The utility model relates to the field of communication technology, especially, relate to a wave filter and topological structure.
Background
With the development of communication technology, the requirements for out-of-band rejection become more and more strict, and two or more transmission zeros are generally required to meet the index requirements of the filter. Although the traditional topological structure can achieve the purpose, the traditional topological structure is inflexible to some special cavity structures, and the space utilization rate is not high. In filter design, the specific position of the input/output port is usually given, and we always want to use the space to the maximum possible in design, but with the addition of transmission zero point, the cavity filter will have limited resonant cavity arrangement due to the topology. In the case of some special cavity structures (e.g. when using a square cavity or a fixed input/output port, etc.), such as using a conventional topology, although the requirements can be met, the structure is not flexible enough. In the face of this situation, it is urgently needed to find a new topology.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides a wave filter and topological structure, can be under the condition that satisfies the wave filter performance for the actual mode of arranging of the component of wave filter is more nimble.
In order to solve the technical problem, the utility model discloses a technical scheme be: providing a topological structure of a filter, wherein the topological structure comprises a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity and a sixth resonant cavity, the first resonant cavity is provided with an input port, and the input port is used for being coupled with an input unit; the first resonant cavity, the second resonant cavity, the third resonant cavity and the fourth resonant cavity are sequentially coupled and connected, and the fourth resonant cavity is coupled and connected with the first resonant cavity; the fourth resonant cavity, the third resonant cavity, the fifth resonant cavity and the sixth resonant cavity are sequentially coupled; the first resonant cavity is coupled with the third resonant cavity; the sixth resonant cavity is provided with an output port, and the output port is used for being coupled with an output unit.
For solving the technical problem, the utility model discloses a another technical scheme is: the filter comprises a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity and a sixth resonant cavity, wherein the first resonant cavity is provided with an input port which is used for being coupled and connected with an input unit; the first resonant cavity, the second resonant cavity, the third resonant cavity and the fourth resonant cavity are sequentially coupled and arranged at four vertex points of a rectangle along the clockwise direction, and the fourth resonant cavity is coupled and connected with the first resonant cavity; the fourth resonant cavity, the third resonant cavity, the fifth resonant cavity and the sixth resonant cavity are sequentially arranged in a straight line along the first direction and are sequentially coupled; the first resonant cavity is coupled with the third resonant cavity; the sixth resonant cavity is provided with an output port, and the output port is used for being coupled with an output unit.
The utility model has the advantages that: different from the prior art, the topological structure of the utility model comprises a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity and a sixth resonant cavity, wherein the first resonant cavity is provided with an input port which is used for being coupled with an input unit; the first resonant cavity, the second resonant cavity, the third resonant cavity and the fourth resonant cavity are sequentially coupled and connected, and the fourth resonant cavity is coupled and connected with the first resonant cavity; the fourth resonant cavity, the third resonant cavity, the fifth resonant cavity and the sixth resonant cavity are sequentially coupled; the first resonant cavity is coupled with the third resonant cavity; the sixth resonant cavity is provided with an output port which is used for being coupled with an output unit, and by the mode, the actual arrangement mode of elements of the filter is more flexible under the condition of meeting the performance of the filter.
Drawings
Fig. 1 is a schematic diagram of the topology of the filter of the present invention;
FIG. 2 is a schematic diagram of a specific structure of a filter according to an embodiment of the present application;
fig. 3 is an equivalent circuit diagram corresponding to the topology of the present invention;
fig. 4 is a schematic diagram of the circuit response of the topology of the present invention.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic diagram of a topology structure of a filter according to the present invention. In this embodiment, the topology of the filter includes: a first resonant cavity 11, a second resonant cavity 12, a third resonant cavity 13, a fourth resonant cavity 14, a fifth resonant cavity 15 and a sixth resonant cavity 16.
Each of the first resonant cavity 11, the second resonant cavity 12, the third resonant cavity 13, the fourth resonant cavity 14, the fifth resonant cavity 15, and the sixth resonant cavity 16 is equivalent to an LC filter circuit, and the LC filter circuit includes an inductor and a capacitor connected in parallel with each other.
The first resonant cavity 11 is provided with an input port S for coupling with an input unit. For example, the input unit may be an antenna unit. In other embodiments, the input unit may also be other radio frequency signal input units.
The first resonant cavity 11, the second resonant cavity 12, the third resonant cavity 13 and the fourth resonant cavity 14 are coupled in sequence, and the fourth resonant cavity 14 is coupled with the first resonant cavity 11. Specifically, the second resonant cavity 12 is coupled to the first resonant cavity 11, the third resonant cavity 13 is coupled to the second resonant cavity 12, the fourth resonant cavity 14 is coupled to the third resonant cavity 13, and the fourth resonant cavity 14 is coupled to the first resonant cavity 11.
As shown in fig. 1, the first resonant cavity 11, the second resonant cavity 12, the third resonant cavity 13, and the fourth resonant cavity 14 are sequentially disposed at four vertices of a rectangle along the clockwise direction.
Optionally, the distance between the first resonant cavity 11 and the second resonant cavity 12, the distance between the second resonant cavity 12 and the third resonant cavity 13, the distance between the third resonant cavity 13 and the fourth resonant cavity 14, and the distance between the fourth resonant cavity 14 and the first resonant cavity 11 are equal to each other.
In other words, the first resonant cavity 11, the second resonant cavity 12, the third resonant cavity 13, and the fourth resonant cavity 14 are sequentially coupled and sequentially disposed at four vertices of a square along the clockwise direction.
The fourth resonant cavity 14, the third resonant cavity 13, the fifth resonant cavity 15, and the sixth resonant cavity 16 are sequentially linearly arranged along the first direction a and sequentially coupled to each other. The first direction a is a direction from the fourth resonant cavity 14 to the third resonant cavity 13. For example, the first direction a is a direction from left to right in fig. 1.
The first resonant cavity 11 is coupled to the third resonant cavity 13.
The sixth resonant cavity 16 is provided with an output port L, and the output port L is used for coupling with an output unit. The signals input by the input unit are filtered by the topological structure and then output to the output unit.
Alternatively, the coupling coefficient between the first resonant cavity 11 and the second resonant cavity 12 and the coupling coefficient between the first resonant cavity 11 and the third resonant cavity 13 are opposite in polarity to each other.
Specifically, the coupling coefficient between the first resonant cavity 11 and the second resonant cavity 12, and the coupling coefficient between the first resonant cavity 11 and the third resonant cavity 13 are positive and negative, respectively.
Optionally, a positive coupling connection is formed between the first resonant cavity 11 and the third resonant cavity 13.
Optionally, the first resonant cavity 11 and the third resonant cavity 13 are connected by a coupling rib 18.
Optionally, the first resonant cavity 11 and the second resonant cavity 12 are in negative coupling connection.
Optionally, the topology further includes a flying bar 17 connected between the first resonant cavity 11 and the second resonant cavity 12, and the first resonant cavity 11 and the second resonant cavity 12 are coupled through the flying bar 17.
It is understood that the coupling rib may be a metal rod or a metal strip disposed between two resonant cavities to be coupled, and both ends of the metal rod or the metal strip are respectively located in the two resonant cavities and connected to the cover plate or the bottom plate constituting the resonant cavities. The flying bar can be a metal bar or a metal strip arranged on a rib plate between two resonant cavities to be coupled, the metal bar is insulated from the rib plate, and two ends of the metal bar are respectively positioned in the two adjacent resonant cavities and correspond to the resonant bars, and a gap is reserved between the two ends of the metal bar and the resonant bars.
Alternatively, the distance between the third resonant cavity 13 and the fifth resonant cavity 15, and the distance between the fifth resonant cavity 15 and the sixth resonant cavity 16 are equal to each other.
As shown in fig. 1, in the topology structure of this embodiment, the actual arrangement of the elements (resonators) of the filter is more flexible under the condition of meeting the performance of the filter, and the filter adopting the above actual position relationship can utilize the space of the empty area AA to perform the evacuation design, thereby reducing the size of the filter.
Referring to fig. 2, fig. 2 is a schematic diagram of an embodiment of a filter according to the present application.
The filter in this embodiment is a cavity filter, and it is understood that the cavity filter generally includes a cavity, a resonator tube, a tuning screw, and a cover plate. The cavity is provided with a plurality of cavities. The resonance tube is combined with the cavity and is contained in the cavity. The cover plate is provided with a plurality of screw holes, and the positions of the screw holes are opposite to the resonance tubes. The tuning screw is matched with the screw hole, and one end of the tuning screw extends into the resonance tube after penetrating through the cover plate. A cavity on the cavity, a resonance tube and a tuning screw form a resonance cavity. The cavity filter may further comprise a cross-coupling structure. The cross-coupling structure is generally disposed on the cavity between two adjacent cavities. And cross coupling is realized through flying rods or coupling ribs.
In this embodiment, the filter includes a cavity 20, and a first resonant cavity 21, a second resonant cavity 22, a third resonant cavity 23, a fourth resonant cavity 24, a fifth resonant cavity 25, and a sixth resonant cavity 26 disposed on the cavity 20. The first resonant cavity 21, the second resonant cavity 22, the third resonant cavity 23 and the fourth resonant cavity 24 are sequentially arranged at four vertices of a square along the clockwise direction.
The fourth resonant cavity 24, the third resonant cavity 23, the fifth resonant cavity 25, and the sixth resonant cavity 26 are arranged linearly along the first direction F in sequence.
The first resonant cavity 21 and the second resonant cavity 22 are coupled through a flying bar 27.
The second resonant cavity 22 is coupled to the third resonant cavity 23 through a coupling window C1.
The third resonant cavity 23 and the fourth resonant cavity 24 are coupled through a coupling window C2.
The third resonant cavity 23 and the fifth resonant cavity 25 are coupled through a coupling window C3.
The fifth resonant cavity 25 is coupled to the sixth resonant cavity 26 through a coupling window C4.
The first resonant cavity 21 and the third resonant cavity 23 are connected by a coupling rib 28.
The fourth cavity 14 is connected to the first cavity 11 coupling window C5.
The first resonant cavity 21 is provided with an input port S for coupling with an input unit. The sixth resonant cavity 26 is provided with an output port L, and the output port L is used for coupling with an output unit.
Referring to fig. 3, fig. 3 is an equivalent circuit diagram of the topology of the present invention.
As shown in fig. 3, a resistor R1 represents an equivalent impedance between the input unit T1 and the first resonant cavity 11, a resistor R2 represents an equivalent impedance between the first resonant cavity 11 and the second resonant cavity 12, a resistor R3 represents an equivalent impedance between the second resonant cavity 12 and the third resonant cavity 13, a resistor R4 represents an equivalent impedance between the third resonant cavity 13 and the fifth resonant cavity 15, a resistor R5 represents an equivalent impedance between the fifth resonant cavity 15 and the sixth resonant cavity 16, a resistor R6 represents an equivalent impedance between the sixth resonant cavity 16 and the output unit T2, a resistor R7 represents an equivalent impedance between the first resonant cavity 11 and the third resonant cavity 13, a resistor R8 represents an equivalent impedance between the first resonant cavity 11 and the fourth resonant cavity 14, and a resistor R9 represents an equivalent impedance between the third resonant cavity 13 and the fourth resonant cavity 14.
Referring to fig. 4, fig. 4 is a circuit response diagram of the topology of the present invention. The circuit response diagram reflects that the topological structure of the embodiment of the application can reach the filtering index of the filter.
The utility model has the advantages that the topological structure comprises a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity and a sixth resonant cavity, the first resonant cavity is provided with an input port, and the input port is used for being coupled with an input unit; the first resonant cavity, the second resonant cavity, the third resonant cavity and the fourth resonant cavity are sequentially coupled and connected, and the fourth resonant cavity is coupled and connected with the first resonant cavity; the fourth resonant cavity, the third resonant cavity, the fifth resonant cavity and the sixth resonant cavity are sequentially coupled; the first resonant cavity is coupled with the third resonant cavity; the sixth resonant cavity is provided with an output port which is used for being coupled with an output unit, and by the mode, the actual arrangement mode of elements of the filter is more flexible under the condition of meeting the performance of the filter.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. The topological structure of the filter is characterized by comprising a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity and a sixth resonant cavity, wherein the first resonant cavity is provided with an input port which is used for being coupled and connected with an input unit; the first resonant cavity, the second resonant cavity, the third resonant cavity and the fourth resonant cavity are sequentially coupled and connected, and the fourth resonant cavity is coupled and connected with the first resonant cavity; the fourth resonant cavity, the third resonant cavity, the fifth resonant cavity and the sixth resonant cavity are sequentially coupled; the first resonant cavity is coupled with the third resonant cavity; the sixth resonant cavity is provided with an output port, and the output port is used for being coupled with an output unit.
2. The topology of claim 1, wherein a coupling coefficient between the first resonant cavity and the second resonant cavity, and a coupling coefficient between the first resonant cavity and the third resonant cavity are opposite in polarity to each other.
3. The topology of claim 1, wherein the first resonant cavity and the third resonant cavity are in a positive coupling connection.
4. The topology of claim 3, wherein the first resonant cavity and the second resonant cavity are in a negative coupling connection.
5. A filter is characterized by comprising a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity and a sixth resonant cavity, wherein the first resonant cavity is provided with an input port, and the input port is used for being coupled with an input unit; the first resonant cavity, the second resonant cavity, the third resonant cavity and the fourth resonant cavity are sequentially coupled and arranged at four vertex points of a rectangle along the clockwise direction, and the fourth resonant cavity is coupled and connected with the first resonant cavity; the fourth resonant cavity, the third resonant cavity, the fifth resonant cavity and the sixth resonant cavity are sequentially linearly arranged along a first direction and are sequentially coupled; the first resonant cavity is coupled with the third resonant cavity; the sixth resonant cavity is provided with an output port, and the output port is used for being coupled with an output unit.
6. The filter of claim 5, wherein the coupling coefficients between the first resonant cavity and the second resonant cavity and the coupling coefficients between the first resonant cavity and the third resonant cavity are opposite in polarity to each other.
7. The filter of claim 5, further comprising a flying bar connected between the first resonant cavity and the second resonant cavity, wherein the first resonant cavity and the second resonant cavity are coupled through the flying bar.
8. The filter of claim 5, further comprising a coupling rib connected between the first resonant cavity and the third resonant cavity.
9. The filter of claim 5, wherein the distance between the first resonant cavity and the second resonant cavity, the distance between the second resonant cavity and the third resonant cavity, the distance between the third resonant cavity and the fourth resonant cavity, and the distance between the fourth resonant cavity and the first resonant cavity are equal in pairs.
10. A filter according to claim 5 or 9, characterised in that the distance between the third and fifth resonant cavities and the distance between the fifth and sixth resonant cavities are equal to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921441848.2U CN210723304U (en) | 2019-08-30 | 2019-08-30 | Filter and topology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921441848.2U CN210723304U (en) | 2019-08-30 | 2019-08-30 | Filter and topology |
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| CN210723304U true CN210723304U (en) | 2020-06-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112599944A (en) * | 2020-11-30 | 2021-04-02 | 湖南迈克森伟电子科技有限公司 | Miniaturized high-suppression adjustable cavity filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112599944A (en) * | 2020-11-30 | 2021-04-02 | 湖南迈克森伟电子科技有限公司 | Miniaturized high-suppression adjustable cavity filter |
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Address after: 233000 building 4, national financial incubation Industrial Park, 17 Yannan Road, high tech Zone, Bengbu City, Anhui Province Patentee after: Dafu Technology (Anhui) Co., Ltd Address before: 518104 First, Second and Third Floors of A1, A2, A3 101, A4 of Shajing Street, Shajing Street, Baoan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN TATFOOK TECHNOLOGY Co.,Ltd. |