CN219959389U - Spiral coil duplex filter - Google Patents
Spiral coil duplex filter Download PDFInfo
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- CN219959389U CN219959389U CN202321042804.9U CN202321042804U CN219959389U CN 219959389 U CN219959389 U CN 219959389U CN 202321042804 U CN202321042804 U CN 202321042804U CN 219959389 U CN219959389 U CN 219959389U
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- cover plate
- spiral coil
- duplex filter
- coil
- shell
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- 239000003990 capacitor Substances 0.000 claims abstract description 15
- 239000000919 ceramic Substances 0.000 claims abstract description 14
- 230000008878 coupling Effects 0.000 claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 14
- 238000005192 partition Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model is applicable to the technical field of filtering, and provides a spiral coil duplex filter, which comprises: a shell which is hollow and has openings at two opposite ends; the first cover plate and the second cover plate are respectively covered at the two opposite ends of the shell, and the first cover plate and the second cover plate respectively close the openings at the two opposite ends of the shell so that a sealed cavity is formed in the shell; the fixed rod, the ceramic chip capacitor and the inductance coil are arranged in the cavity and are spaced from each other; the spiral coil is sleeved on the fixing rod; the coupling coil and the connector are arranged on the first cover plate; a tuning screw passing through the second cover plate and extending into the cavity. The spiral coil duplex filter can reduce the whole volume of the spiral coil duplex filter, improve the unloaded Q value of the resonator, and improve the electrical performance technical index when the frequency is low and the bandwidth is narrow.
Description
Technical Field
The utility model belongs to the technical field of filtering, and particularly relates to a spiral coil duplex filter.
Background
The filter is a device which can effectively filter out frequency points of specific frequencies or frequencies except the frequency points in a circuit to obtain a signal of the specific frequency or eliminate a signal of the specific frequency, and is equivalent to a period for filtering various noise signals, and is widely used in the field of communication.
The filter in the prior art mainly comprises a shell with a cavity, and a capacitor, an inductor and a resistor arranged in the cavity. Of course, the filter also comprises other auxiliary structures, such as a tuning screw, and other corresponding devices can be additionally arranged according to actual requirements.
In the design process of a conventional filter, a duplexer and a multiplexer, the design mode mainly adopted is coaxial cavity design, the overall size of the filter is larger under the condition of low frequency and device appearance limitation, the unloaded Q value of the resonator is low, the electrical performance technical index is also lower under the condition of low frequency narrow bandwidth, and the requirements of miniaturization, 1% bandwidth products less than or equal to 1% bandwidth products and high unloaded Q value cannot be met.
Disclosure of Invention
The embodiment of the utility model provides a spiral coil duplex filter, which aims to solve the problems that in the prior art, the filter adopts a coaxial cavity design mode, so that the whole volume of the filter is large, the unloaded Q value of a resonator is low, the electrical performance technical index is low when the frequency is narrow in bandwidth, and miniaturization, 1% bandwidth products less than or equal to 1% bandwidth products and high unloaded Q value cannot be met.
Embodiments of the present utility model are thus implemented, providing a spiral coil duplex filter, comprising:
a shell which is hollow and has openings at two opposite ends;
the first cover plate and the second cover plate are respectively covered at the two opposite ends of the shell, and the first cover plate and the second cover plate respectively close the openings at the two opposite ends of the shell so that a sealed cavity is formed in the shell;
the fixed rod, the ceramic chip capacitor and the inductance coil are arranged in the cavity and are spaced from each other;
the spiral coil is sleeved on the fixing rod, and the spiral coil, the ceramic chip capacitor and the inductance coil are electrically connected with each other;
the coupling coil and the connector pass through the first cover plate and are electrically connected to the ceramic chip capacitor and the inductance coil respectively;
a tuning screw passing through the second cover plate and extending into the cavity.
Further, the housing divides the cavity into six through a partition; the fixing rods comprise six and are respectively arranged in the six cavities, and the spiral coil comprises six and is respectively sleeved on the six fixing rods; the ceramic chip capacitor and the inductance coil comprise three, the coupling coil comprises four, the connector comprises three, and the tuning screw comprises six cavities and extends to six cavities respectively.
Further, the section of the first cover plate is of a U-shaped structure and is provided with a U-shaped groove; the coupling coil is arranged in the U-shaped groove, and the connector is detachably arranged on one side, away from the shell, of the first cover plate.
Further, the connector is detachably arranged on one side, away from the shell, of the first cover plate through screws.
Further, the section of the second cover plate is of an L-shaped structure; the tuning screw is detachably arranged on one side, close to the shell, of the second cover plate.
Further, the first cover plate and the second cover plate are detachably covered at two opposite ends of the shell.
Further, the shell is of a rectangular structure.
Still further, the fixing rod and the tuning screw are both of a cylindrical structure.
The utility model has the beneficial effects that: the parallel resonant circuit in the coupled resonant filter is realized by adopting the spiral resonator, so that the whole volume of the spiral coil duplex filter can be reduced, the unloaded Q value of the resonator is improved, and the electrical performance technical index is improved when the frequency is low and the bandwidth is narrow, so that the spiral coil duplex filter is reduced, and the requirements of miniaturization, 1% bandwidth products less than or equal to 1% bandwidth products and high unloaded Q value are met.
Drawings
Fig. 1 is a schematic perspective view of a spiral coil duplex filter according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a spiral coil duplex filter with a housing removed according to an embodiment of the present utility model.
Wherein, 100, a spiral coil duplex filter; 1. a housing; 2. a first cover plate; 21. a U-shaped groove; 3. a second cover plate; 4. a fixing rod; 5. a ceramic chip capacitor; 6. an inductance coil; 7. a spiral coil; 8. a coupling coil; 9. a connector; 10. and (3) tuning the screw.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In the prior art, the filter adopts a coaxial cavity design mode, so that the overall volume of the filter is large, the unloaded Q value of the resonator is low, the electrical performance technical index is low when the frequency is low and the bandwidth is narrow, and the requirements of miniaturization, 1% bandwidth products less than or equal to the bandwidth and high unloaded Q value cannot be met. The spiral coil duplex filter of the utility model realizes the parallel resonance loop in the coupled resonance filter by adopting the spiral resonator, thereby reducing the whole volume of the spiral coil duplex filter, improving the unloaded Q value of the resonator, and improving the electrical performance technical index when the frequency is low and the bandwidth is narrow, so that the spiral coil duplex filter is reduced to meet the requirements of miniaturization, 1% bandwidth products or less and high unloaded Q value.
Example 1
As shown in conjunction with fig. 1 to 2, the present embodiment provides a spiral coil duplex filter 100, which includes:
a shell 1 which is hollow and has openings at two opposite ends;
a first cover plate 2 and a second cover plate 3 respectively covering opposite ends of the housing 1, the first cover plate 2 and the second cover plate 3 respectively closing openings of the opposite ends of the housing 1 so that a sealed cavity (not shown) is formed inside the housing 1;
the fixed rod 4, the ceramic chip capacitor 5 and the inductance coil 6 are arranged in the cavity and are spaced from each other;
the spiral coil 7 is sleeved on the fixing rod 4, and the spiral coil 7, the ceramic chip capacitor 5 and the inductance coil 6 are electrically connected with each other;
the coupling coil 8 and the connector 9 (input-output connector 9) are arranged on the first cover plate 2, and the coupling coil 8 and the connector 9 respectively penetrate through the first cover plate 2 and are electrically connected to the ceramic chip capacitor 5 and the inductance coil 6;
a tuning screw 10 passing through the second cover plate 3 and extending into the cavity.
In this embodiment, the housing 1 has a rectangular structure; both the fixing rod 4 and the tuning screw 10 are of cylindrical structure. Of course, the housing 1, the fixing bar 4 and the tuning screw 10 may be designed in other shapes according to practical requirements.
In this embodiment, the housing 1 divides the cavity into six by a partition plate (not shown); the fixing rods 4 comprise six and are respectively arranged in the six cavities, and the spiral coil 7 comprises six and is respectively sleeved on the six fixing rods 4; the ceramic chip capacitor 5 and the inductance coil 6 comprise three, the coupling coil 8 comprises four, the connector 9 comprises three, and the tuning screw 10 comprises six and extends to six cavities respectively.
The spiral coil duplex filter 100 in this embodiment realizes the parallel resonant loop in the coupled resonant filter by adopting the spiral resonator, so that the overall volume of the spiral coil duplex filter 100 can be reduced, the unloaded Q value of the resonator is improved, and the electrical performance technical index is improved at the time of low frequency and narrow bandwidth, so that the reduced spiral coil duplex filter 100 meets the requirements of miniaturization, 1% bandwidth product less than or equal to the product and high unloaded Q value.
Example two
As shown in fig. 1 or fig. 2, this embodiment is an alternative embodiment based on the first embodiment, specifically: the section of the first cover plate 2 is of a U-shaped structure and is provided with a U-shaped groove 21; the coupling coil 8 is arranged in the U-shaped groove 21, and the connector 9 is detachably arranged on one side, away from the shell 1, of the first cover plate 2.
In this embodiment, the connector 9 is detachably provided on the side of the first cover plate 2 away from the housing 1 by screws (not shown).
By designing the cross section of the first cover plate 2 to have a U-shaped structure and having a U-shaped groove 21, it is possible to provide a space for accommodating the coupling coil 8 and a region for mounting the connector 9; by detachably connecting the connector 9 with the first cover plate 2, the connector 9 can be conveniently detached for later maintenance or replacement; the connector 9 can be detachably arranged on the first cover plate 2 through screws, so that the connector 9 can be conveniently dismounted.
Example III
As shown in fig. 2, this embodiment is an alternative embodiment based on the first embodiment, specifically: the section of the second cover plate 3 is of an L-shaped structure; the tuning screw 10 is detachably arranged on one side of the second cover plate 3 close to the shell 1.
By designing the cross section of the second cover plate 3 into an L-shaped structure, the stability of the whole structure after being horizontally placed can be improved under the condition that the length of the tuning screw 10 is not exceeded, and the volume of the whole structure can not be improved; by detachably connecting the tuning screw 10 to the second cover plate 3, a later replacement of the tuning screw 10 can be facilitated.
Example IV
As shown in fig. 1 or fig. 2, this embodiment is an alternative embodiment based on the first embodiment, specifically: the first cover plate 2 and the second cover plate 3 are detachably covered at opposite ends of the housing 1.
By detachably connecting the first cover plate 2 and the second cover plate 3 with the housing 1, respectively, the first cover plate 2 and/or the second cover plate 3 can be conveniently detached, so that corresponding parts in the cavity can be conveniently maintained or replaced at a later stage.
In summary, the spiral coil duplex filter 100 of the present utility model adopts the spiral resonator to realize the parallel resonant loop in the coupled resonant filter, so that the overall volume of the spiral coil duplex filter 100 can be reduced, the unloaded Q value of the resonator is improved, and the electrical performance technical index is improved at the time of low frequency and narrow bandwidth, so that the spiral coil duplex filter 100 is reduced to meet the requirements of miniaturization, 1% bandwidth product less than or equal to the product and high unloaded Q value; by designing the cross section of the first cover plate 2 to have a U-shaped structure and having a U-shaped groove 21, it is possible to provide a space for accommodating the coupling coil 8 and a region for mounting the connector 9; by detachably connecting the connector 9 with the first cover plate 2, the connector 9 can be conveniently detached for later maintenance or replacement; the connector 9 is detachably arranged on the first cover plate 2 through the screws, so that the connector 9 can be conveniently disassembled and assembled; by designing the cross section of the second cover plate 3 into an L-shaped structure, the stability of the whole structure after being horizontally placed can be improved under the condition that the length of the tuning screw 10 is not exceeded, and the volume of the whole structure can not be improved; by detachably connecting the tuning screw 10 with the second cover plate 3, the later replacement of the tuning screw 10 can be facilitated; by detachably connecting the first cover plate 2 and the second cover plate 3 with the housing 1, respectively, the first cover plate 2 and/or the second cover plate 3 can be conveniently detached, so that corresponding parts in the cavity can be conveniently maintained or replaced at a later stage.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (8)
1. A spiral coil duplex filter, comprising:
a shell which is hollow and has openings at two opposite ends;
the first cover plate and the second cover plate are respectively covered at the two opposite ends of the shell, and the first cover plate and the second cover plate respectively close the openings at the two opposite ends of the shell so that a sealed cavity is formed in the shell;
the fixed rod, the ceramic chip capacitor and the inductance coil are arranged in the cavity and are spaced from each other;
the spiral coil is sleeved on the fixing rod, and the spiral coil, the ceramic chip capacitor and the inductance coil are electrically connected with each other;
the coupling coil and the connector pass through the first cover plate and are electrically connected to the ceramic chip capacitor and the inductance coil respectively;
a tuning screw passing through the second cover plate and extending into the cavity.
2. The spiral coil duplex filter of claim 1 wherein the housing divides the cavity into six by a partition; the fixing rods comprise six and are respectively arranged in the six cavities, and the spiral coil comprises six and is respectively sleeved on the six fixing rods; the ceramic chip capacitor and the inductance coil comprise three, the coupling coil comprises four, the connector comprises three, and the tuning screw comprises six cavities and extends to six cavities respectively.
3. The spiral coil duplex filter of claim 1 wherein the first cover plate has a U-shaped cross-section and has a U-shaped slot; the coupling coil is arranged in the U-shaped groove, and the connector is detachably arranged on one side, away from the shell, of the first cover plate.
4. The spiral coil duplex filter of claim 3 wherein the connector is removably disposed on a side of the first cover plate remote from the housing by screws.
5. The spiral coil duplex filter of claim 1 wherein the second cover plate has an L-shaped cross-section; the tuning screw is detachably arranged on one side, close to the shell, of the second cover plate.
6. The spiral coil duplex filter of claim 1 wherein the first cover plate and the second cover plate are removably disposed at opposite ends of the housing.
7. The spiral coil duplex filter of claim 1 wherein the housing is of rectangular configuration.
8. The spiral coil duplex filter of claim 1 wherein the fixed rod and the tuning screw are each of cylindrical configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321042804.9U CN219959389U (en) | 2023-04-28 | 2023-04-28 | Spiral coil duplex filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321042804.9U CN219959389U (en) | 2023-04-28 | 2023-04-28 | Spiral coil duplex filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219959389U true CN219959389U (en) | 2023-11-03 |
Family
ID=88553303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321042804.9U Active CN219959389U (en) | 2023-04-28 | 2023-04-28 | Spiral coil duplex filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219959389U (en) |
-
2023
- 2023-04-28 CN CN202321042804.9U patent/CN219959389U/en active Active
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