CN208738402U - Cavity body filter - Google Patents

Abstract

The embodiment of the present application provides a kind of cavity body filter, it is characterized in that, including tuning screw, box body, cover board, resonator, the cover board and the resonator are integrally formed, the cover board is assemblied on the box body, resonant cavity is formed with the box body, the junction of the resonator and the cover board is equipped with the first groove, and first groove is located at the outside of the resonant cavity, the resonator is provided with duct, the resonator is run through in the duct, it is connected to first groove and the resonant cavity, the head of the tuning screw passes through the resonator by the duct and enters the resonant cavity, reduction size is reached, improve power capacity, the better purpose of intermodulation.

Description

Cavity body filter

Technical field

This application involves field of communication technology more particularly to a kind of cavity body filters.

Background technique

Filter is the key equipment of modern mobile communcations system, is widely used in wireless communication base station, to eliminate The clutter and interference signal other than signal frequency are needed, is a kind of common frequency-selecting device.There are many multiplicity, lumens for filter Fluid filter is favored because it has the characteristics that firm in structure, working frequency range is high, loss is low, it is high to bear power.

Cavity body filter is a kind of pure structural device, and the structure that performance indicator and reliability both depend on itself is special Sign., using resonant cavity structure, a cavity can be equivalent at inductance in parallel capacitor for it, so that a resonance level is formed, Realize microwave filtering function.Fig. 1 is conventional filter structural schematic diagram, as shown in Figure 1, the debugging machine of traditional cavity body filter Structure needs to assemble tuning screw 11, locking nut 15 and cover board 13, using tools such as screwdriver, spanners due to having The presence of nut 15 and tuning screw 11, some total space of 13 top of cover board can not efficiently use, and with filtering Device volume requirement is increasingly stringenter, while the unserviceable space in this part has seriously affected the overall performance of filter.Simultaneously The part stretched out due to tuning screw 11 and the part of 14 top of resonator fluting have tiny protrusion and corner angle, this can be tight The power capacity for reducing resonator 14 again, deteriorates intermodulation index.

To sum up, traditional cavity body filter is made, it need to be in the limited situation of narrow space, according to above-mentioned design The cavity body filter that mode makes will be difficult to meet space requirement, and the power capacity of filter is also smaller, therefore, needs One kind is smaller, cost is lower and power capacity is bigger, the better cavity body filter of intermodulation.

Utility model content

In view of this, the embodiment of the present application provides a kind of cavity body filter, to overcome cavity filtering in the prior art The defects of device size is larger, and power capacity is lower, deteriorates intermodulation index, has reached reduction size, improves power capacity, intermodulation is more Good purpose.

To achieve the goals above, the embodiment of the present application provides a kind of cavity body filter, including tuning screw, box body, Cover board, resonator, the cover board and the resonator are integrally formed, and the cover board is assemblied on the box body, with the box body The junction of formation resonant cavity, the resonator and the cover board is equipped with the first groove, and first groove is positioned at described humorous Shake the outside of chamber, and the resonator is provided with duct, and the resonator is run through in the duct, be connected to first groove with it is described Resonant cavity, the head of the tuning screw pass through the resonator by the duct and enter the resonant cavity.

Optionally, in any embodiment of the application, the head of the tuning screw and the box body form capacitor.

Optionally, further include the first screw thread and the second screw thread in any embodiment of the application, first screw thread with Described second is threadedly engaged, and the length of the resonant cavity is entered for adjusting the tuning screw.

Optionally, in any embodiment of the application, first screw thread is set to inside the duct or described Second screw thread is set to outside the tuning screw.

Optionally, in any embodiment of the application, first screw thread is arranged in the middle part in the duct or sets It sets close to first groove.

Optionally, in any embodiment of the application, the middle part of the tuning screw is arranged in second screw thread.

Optionally, in any embodiment of the application, the tuning screw tail portion is provided with the second groove, by described Second groove screws the tuning screw, and the length of the resonant cavity is entered for adjusting the tuning screw.

Optionally, in any embodiment of the application, the duct is located at the bottom of first groove.

Optionally, in any embodiment of the application, the duct is located at the central location of first bottom portion of groove.

To sum up, cavity body filter provided by the embodiments of the present application, including tuning screw, box body, cover board, resonator are described Cover board and the resonator are integrally formed, and the cover board is assemblied on the box body, form resonant cavity with the box body, described humorous The junction of vibration device and the cover board is equipped with the first groove, and first groove is located at the outside of the resonant cavity, described humorous Vibration device is provided with duct, and the resonator is run through in the duct, is connected to first groove and the resonant cavity, the tuning spiral shell The head of nail passes through the resonator by the duct and enters the resonant cavity, has reached reduction size, has improved power capacity, The better purpose of intermodulation.

Detailed description of the invention

In order to illustrate more clearly of the technical solution of the utility model embodiment, embodiment or the prior art will be retouched below Attached drawing needed in stating is briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model Some embodiments for those of ordinary skill in the art without creative efforts, can also basis These attached drawings obtain other attached drawings.

Fig. 1 is conventional filter structural schematic diagram.

Fig. 2 is the embodiment of the present application cavity body filter structural schematic diagram.

Specific embodiment

Any technical solution for implementing the embodiment of the present application must be not necessarily required to reach simultaneously above all advantages.

Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause This, is not intended to limit claimed invention to the detailed description of the embodiment of the present invention provided in the accompanying drawings below Range, but it is merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not doing Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.

In order to make those skilled in the art more fully understand the technical solution in the embodiment of the present application, below in conjunction with the application Attached drawing in embodiment, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described reality Applying example only is the embodiment of the present application a part of the embodiment, instead of all the embodiments.Based on the implementation in the embodiment of the present application The range of the embodiment of the present application protection all should belong in example, those of ordinary skill in the art's every other embodiment obtained.

Further illustrate that the embodiment of the present application implements below with reference to the embodiment of the present application attached drawing.Fig. 2 is the application reality Apply a cavity body filter structural schematic diagram.As shown in Fig. 2, one embodiment of the application provides a kind of cavity body filter, packet Include tuning screw 21, box body 22, cover board 23, resonator 24, the cover board 23 and the resonator 24 integrated molding, the cover board 23 are assemblied on the box body 22, form resonant cavity 25, the connection of the resonator 24 and the cover board 23 with the box body 22 Place is equipped with the first groove, and first groove is located at the outside of the resonant cavity 25, and the resonator 24 is provided with duct, institute Duct is stated through the resonator 24, is connected to first groove and the resonant cavity 25, the head of the tuning screw 21 is logical It crosses the duct and enters the resonant cavity 25 across the resonator 24.

In the present embodiment, the tuning screw 21 is embedded to inside the resonator 24, does not have the tuning screw 21 There is protrusion in 23 outside of cover board, thus greatly reduces the size and cost of the cavity body filter.

Optionally, in one embodiment of the application, the head of the tuning screw 21 and the box body 22 form capacitor.Specifically Ground, the head of the tuning screw 21 passes through the resonator 24 by the duct and enters the resonant cavity 25, so that described 21 head of tuning screw and the box body 22 constitute capacitor；In use, it is only necessary to adjust the tuning screw 21 and enter The length of the resonant cavity 25, that is, be adjusted the resonance frequency of the cavity body filter.As shown in Figure 1, being adjusted in conventional filter Humorous screw 11 forms capacitor with resonator 14, since tuning screw 11 part stretched out and the part that 14 top of resonator is slotted have There are tiny protrusion and corner angle, so seriously reducing the power capacity of resonator, deteriorates intermodulation index.It is described in the present embodiment Tuning screw 21 and the box body 22 constitute capacitor, the protrusion and burr at edge are significantly reduced, so that the cavity body filter Power capacity it is bigger, intermodulation is more preferable.

It further, further include the first screw thread (not shown) and the second screw thread (figure in the embodiment of the application In be not shown), first screw thread is threadedly engaged with described second, enters the resonant cavity for adjusting the tuning screw 21 25 length.By the cooperation of first screw thread and the second screw thread, the tuning screw 21 is locked, locking nut is eliminated, Reduce the size of the cavity body filter.

Further, first screw thread is set to inside the duct or second screw thread is set to the tuning Outside screw 21.Specifically the position etc. in the middle part of duct or being positioned close to box body, institute can be set in first screw thread Stating the second screw thread can be set the middle position in the tuning screw 21 or the position close to head.

Specifically, first screw thread is arranged in the middle part in the duct or is positioned close to first groove. Compared with first screw thread is positioned close at box body, first screw thread is located proximate to the cover board 23, the tuning The position that screw 21 is locked is adjacent to the cover board 23, and the tuning screw 21 enters the length of the resonant cavity 25 relatively It is few, convenient for adjusting the parameter of the cavity body filter.

Specifically, the middle part of the tuning screw 21 is arranged in second screw thread.With setting in the tuning screw 21 Head compared with tail portion so that the tuning screw 21 enter the resonant cavity 25 moderate length, adjust it is relatively convenient, section About regulating time.

Optionally, in one embodiment of the application, 21 tail portion of tuning screw is provided with the second groove, passes through described second Groove screws the tuning screw 21, and the length of the resonant cavity 25 is entered for adjusting the tuning screw 21.Specifically, exist In adjustment process, screws second groove and the tuning screw 21 is rotated, by so the first screw thread and described second The cooperation of screw thread, so that the tuning screw 21 moves up and down.

Optionally, in one embodiment of the application, the duct is located at the bottom of first groove.It is set compared to the duct It sets in side, it is more convenient to adjust the tuning screw.

Specifically, the duct is located at the central location of first bottom portion of groove.The duct may be located on described The position to the left or to the right of first bottom portion of groove, but compared to other positions, central position filters the cavity The performance of wave device is more stable.

Optionally, in one embodiment of the application, the length of the tuning screw 21 is less than the cover board 23 and arrives the box body The distance of 22 bottoms.Guarantee that the tuning screw 21 in first groove, does not protrude into outside the cover board 23.

Statement " first ", " second " used in the various embodiments of the application, " first " or " described Two " can modify various parts and unrelated with sequence and/or importance, but these statements do not limit corresponding component.The above statement It is only used for the purpose for distinguishing element and other elements.For example, the first user equipment and second user equipment indicate different User equipment, although being both user equipment.For example, first element can claim under the premise of without departing substantially from the scope of the present disclosure Make second element, similarly, second element can be referred to as first element.

This specification " embodiment " refers to special characteristic, structure, in configuration or feature quilt described in the embodiment It is included at least one embodiment of the present invention.Therefore, the phrase " in the embodiment of the application " of appearance is in this specification The middle different places present invention not necessarily refers to identical embodiment.In addition, specific feature, structure, configuration or characteristic can be to appoint What suitable mode combines in one or more embodiments.

Although the preferred of the utility model has been described, once a person skilled in the art knows substantially creative Concept can then make other change and modification to these.So it includes preferably and falling that the following claims are intended to be interpreted as Enter all change and modification of the scope of the utility model.Obviously, those skilled in the art can carry out the utility model each Spirit and scope of the kind modification and variation without departing from the utility model.If in this way, these modifications and change of the utility model Type belongs to the scope of the claims of the present invention and its equivalent technology, then the utility model is also intended to encompass these changes Including modification.

Claims (10)

1. a kind of cavity body filter, which is characterized in that including tuning screw, box body, cover board, resonator, the cover board with it is described Resonator is integrally formed, and the cover board is assemblied on the box body, forms resonant cavity with the box body；The resonator with it is described The junction of cover board is equipped with the first groove, and first groove is located at the outside of the resonant cavity, and the resonator is provided with The resonator is run through in duct, the duct, is connected to first groove and the resonant cavity, and the head of the tuning screw is logical It crosses the duct and enters the resonant cavity across the resonator.

2. cavity body filter according to claim 1, which is characterized in that the head of the tuning screw and the box body shape At capacitor.

3. cavity body filter according to claim 1, which is characterized in that it further include the first screw thread and the second screw thread, it is described First screw thread is threadedly engaged with described second, and the length of the resonant cavity is entered for adjusting the tuning screw.

4. cavity body filter according to claim 3, which is characterized in that first screw thread is set to inside the duct Or second screw thread is set to outside the tuning screw.

5. cavity body filter according to claim 4, which is characterized in that first screw thread is arranged in the duct Portion is positioned close to first groove.

6. cavity body filter according to claim 4, which is characterized in that second screw thread is arranged in the tuning screw Middle part.

7. cavity body filter according to claim 1, which is characterized in that it is recessed that the tuning screw tail portion is provided with second Slot screws the tuning screw by second groove, and the length of the resonant cavity is entered for adjusting the tuning screw.

8. cavity body filter according to claim 1, which is characterized in that the duct is located at the bottom of first groove Portion.

9. cavity body filter according to claim 8, which is characterized in that the duct is located at first bottom portion of groove Central location.

10. cavity body filter according to claim 1, which is characterized in that the length of the tuning screw is less than the lid Distance of the plate to the box body bottom.