CN104037478A

CN104037478A - Medium filter

Info

Publication number: CN104037478A
Application number: CN201410228166.9A
Authority: CN
Inventors: 丁海
Original assignee: Comba Telecom Systems China Ltd
Current assignee: Comba Telecom Technology Guangzhou Ltd; Comba Telecom Systems Guangzhou Co Ltd
Priority date: 2014-05-27
Filing date: 2014-05-27
Publication date: 2014-09-10
Anticipated expiration: 2034-05-27
Also published as: CN104037478B

Abstract

The invention discloses a medium filter, which comprises a cavity and a cover plate covered on the top of the cavity, wherein two resonators shielded by a metal wall are arranged in the cavity, and each resonator comprises a resonant cavity and a resonant column arranged in the resonant cavity. The medium filter also comprises a flying rod which penetrates through the metal wall and is isolated with the metal wall; the flying rod is provided with two side arms which are separately positioned in two resonant cavities of the two resonators and are used to be separately coupled with the resonant column in the corresponding resonant cavity; one side, which is back on to the resonant column, of at least one side wall of the flying rod is provided with a tuning rod which penetrates through the cover plate and goes deep into the corresponding resonant cavity; and coupling strength between the side wall of the flying rod and the resonant column in the resonant cavity where the tuning rod is positioned is changed by the axial movement of the tuning rod. In the above way, the medium filter disclosed by the invention is capable of regulating the coupling strength between the flying rod and the resonant column under the condition that the cover plate of the medium filter is not disassembled.

Description

Dielectric filter

Technical field

The present invention relates to filter field, particularly relate to a kind of dielectric filter.

Background technology

In present mobile communication technology, microwave radio device is important part.Filter is as a kind of basic radio frequency unit, and a series of indexs such as its insertion loss, Out-of-band rejection, passive intermodulation and power capacity have important impact for the performance of complete machine.Traditional metal coaxial cavity filter is due to the reason of own loss, in the situation that limiting cavity size, cannot obtain very high quality factor (Q value), cause the index such as Out-of-band rejection and insertion loss to be subject to certain restrictions, and the link such as the silver-plated processing in metal surface also can produce certain impact to passive intermodulation index.

At present, dielectric filter is applied in various types of communication base station gradually because its loss is little, selectivity is high, and its advantage has: high Q value, temperature are floated little and stable full temperature characteristics and high power etc.There is significantly difference in the coupling implementation of TE mould dielectric filter, and its cross-couplings design form and design difficulty are far longer than wire chamber form filter and medium T M mode filter compared with metal coaxial cavity filter.

But concentrate because TE mould dielectric resonator electromagnetic field distributes the weak characteristic of medium coupling producing, TE mould dielectric resonator is used on the passive device narrow at passage, selectivity is high conventionally.This resonator in use, for reaching the degree of coupling of expectation, needs constantly to adjust position and the physical dimension of coupling device.Each adjustment of coupling device all needs the cover plate of filter to take apart, after having adjusted, then by fixing cover plate reduction, then re-starts debugging.In the time there is mixer, in filter, multiple signals share a cover plate, and debugging is particularly inconvenient, affects production efficiency.

Summary of the invention

The technical problem that the present invention mainly solves is to provide a kind of dielectric filter, can, in the situation that not dismantling dielectric filter cover plate, regulate the stiffness of coupling flying between bar and resonant column.

For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of dielectric filter is provided, comprise that cavity and lid are located at the cover plate of cavity top, be provided with two resonators that shielded mutually by metallic walls in cavity, each resonator comprises resonant cavity and is placed in the resonant column in resonant cavity.Dielectric filter also comprise run through metallic walls and with metallic walls insulate mutually arrange fly bar; Fly bar and there are two side arms, lay respectively in two resonant cavitys of two resonators, for respectively with corresponding resonant cavity in resonant column be coupled; In the side place back to resonant column that flies at least one side arm of bar, be provided with the tuning plug that runs through cover plate and go deep into corresponding resonant cavity, tuning plug changes the stiffness of coupling that flies bar side arm and resonant column in its place resonant cavity by its axial motion.

Wherein, metallic walls comprises SI semi-insulation dielectric wall, and dielectric wall runs through setting to realize the insulation that flies bar and metallic walls for flying bar.

Wherein, fly bar and tuning plug is metal material, and fly bar and tuning plug interval arranges.

Wherein, two side arms that fly bar are equipped with a tuning plug that runs through cover plate and go deep into corresponding resonant cavity back to a side of resonant column.

Wherein, fly bar two side arms and be arched arm.

Wherein, arched arm is vertical with the axial line of the resonant column being coupled with it, and crossing with the magnetic line of force of this resonant column.

Wherein, arched arm is single line shape, and the resonant column being coupled with it arranges with one heart.

Wherein, resonant column is TE mould dielectric resonance post.

Wherein, dielectric filter also comprises a resonator, for being coupled with two resonators respectively, to form cross coupling dielectric filter.

The invention has the beneficial effects as follows: be different from the situation of prior art, dielectric filter of the present invention comprises cavity, cover plate, two resonators that shielded mutually by metallic walls, flies bar and tuning plug.Wherein, each resonator comprises resonant cavity and is placed in the resonant column in resonant cavity; Fly bar run through metallic walls and with the metallic walls setting of insulating mutually; Two side arms that fly bar lay respectively in two resonant cavitys of two resonators, respectively with corresponding resonant cavity in resonant column be coupled.For regulating the stiffness of coupling that flies bar side arm and resonant column, in the side place back to resonant column that flies at least one side arm of bar, be provided with the tuning plug that runs through cover plate and go deep into corresponding resonant cavity, tuning plug can axial motion to change the stiffness of coupling that flies bar side arm and resonant column in its place resonant cavity.By the way, dielectric filter of the present invention can, in the situation that not dismantling dielectric filter cover plate, regulate the stiffness of coupling flying between bar and resonant column.

Brief description of the drawings

Fig. 1 is the fragmentary, perspective view of TE mould dielectric filter port of the present invention one embodiment.

Embodiment

Below in conjunction with drawings and Examples, the present invention is described in detail.

Refer to Fig. 1, Fig. 1 is the fragmentary, perspective view of TE mould dielectric filter port of the present invention one embodiment, as shown in Figure 1, comprises cover plate 11, cavity 12, the first resonator 13, the second resonator 14, the 3rd resonator 15, flies bar 16 and tuning plug 17.

Wherein, cover plate 11 lids are located at the top of cavity 12.

The first resonator 13, the second resonator 14 and the 3rd resonator 15 are placed in respectively in cavity 12, and the first resonator 13 is shielded by metallic walls mutually with the second resonator 14, the 3rd resonator 15 is coupled with the first resonator 13 and the second resonator 14 respectively, forms cross-linked state.

The first resonator 13 comprises resonant cavity 131 and is placed in the resonant column 132 in resonant cavity 131, the second resonator 14 comprises that resonant cavity 141 and resonant column 142, the three resonators 15 that are placed in resonant cavity 141 comprise resonant cavity 151 and are placed in the resonant column 152 in resonant cavity 151.In the present embodiment, resonant column 132,142,152 is TE mould dielectric resonance post.

Metallic walls between the first resonator 13 and the second resonator 14 comprises SI semi-insulation dielectric wall, flies bar 16 and runs through dielectric wall to realize the insulation setting that flies bar 16 and metallic walls.

Fly bar 16 and supported by dielectric wall, two side arm lays respectively in resonant cavity 131 resonant cavity 141, for being coupled with resonant column 132, resonant column 142 respectively.In the present embodiment, fly bar two side arms and be arched arm, two arched arms respectively vertical with the axial line of resonant column 142 with the resonant column 132 being coupled with it, the magnetic line of force is crossing.Wherein, arched arm can be single line shape, and the resonant column being coupled with it arranges with one heart.

In flying the side place of bar 16 1 side arms back to resonant column 132, be provided with the tuning plug 17 that runs through cover plate 11 and go deep into corresponding resonant cavity 131, tuning plug 17 can change the stiffness of coupling that flies bar side arm and resonant column 132 in its place resonant cavity 131 by its axial motion.Wherein, flying bar 16 arranges with tuning plug 17 intervals.

Be metal material owing to flying bar 16 with tuning plug 17, therefore the axial motion of tuning plug 17 can change the stiffness of coupling that flies bar side arm and resonant column 132 in its place resonant cavity 131, be specially and change the size that flies the electric capacity that bar side arm and resonant column 132 form in resonant cavity 131, and then change flies the stiffness of coupling of bar side arm and resonant column 132.

In other embodiments, two side arms that fly bar 16 are equipped with a tuning plug 17 back to a side of resonant column 132,142, so that correspondence regulates the stiffness of coupling between two side arms and the resonant column 132,142 of its place resonant cavity 131,141 respectively.

In the present embodiment, between the first resonator 13 and the 3rd resonator 15, the second resonator 14 and the 3rd resonator 15, be equipped with coupling window to realize coupling.

The bar adjustable design that is coupled that flies that it is pointed out that the present embodiment can be applicable to have the TE mould dielectric filter that closes road mode.As TE01 mould dielectric filter, comprise the dielectric filter described in multiple the present embodiment.

In sum, TE mould dielectric filter of the present invention can, in the situation that not dismantling filter cover board, regulate the stiffness of coupling flying between bar and resonant column, realizes the adjustable design that flies bar, make filter there is better electric index, as: insertion loss is little, Out-of-band rejection is high and passive intermodulation is low etc.TE mould dielectric filter of the present invention adjustable flies bar design, simplicity of design, and adjustable range is large, and debugging is convenient, greatly improves the debugging efficiency of TE mould dielectric filter, and high conformity is convenient to batch production, and can be facilitated device frequency displacement and passbands specification adjustment etc.

The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims

1. a dielectric filter, comprise that cavity and lid are located at the cover plate of described cavity top, in described cavity, be provided with two resonators that shielded mutually by metallic walls, each resonator comprises resonant cavity and is placed in the resonant column in resonant cavity, it is characterized in that, also comprise run through described metallic walls and with described metallic walls insulate mutually arrange fly bar;

The described bar that flies has two side arms, lay respectively in two resonant cavitys of two resonators, for respectively with corresponding resonant cavity in resonant column be coupled;

In the described side place back to resonant column that flies at least one side arm of bar, be provided with the tuning plug that runs through cover plate and go deep into corresponding resonant cavity, described tuning plug changes the stiffness of coupling that flies bar side arm and resonant column in its place resonant cavity by its axial motion.

2. dielectric filter according to claim 1, is characterized in that, described metallic walls comprises SI semi-insulation dielectric wall, flies bar and run through setting described in described dielectric wall supplies.

3. dielectric filter according to claim 2, is characterized in that, described in fly bar and tuning plug is metal material, and described in fly bar and tuning plug interval arranges.

4. dielectric filter according to claim 1, is characterized in that, described in fly bar two side arms be equipped with a tuning plug that runs through cover plate and go deep into corresponding resonant cavity back to a side of resonant column.

5. according to the dielectric filter described in any one in claim 1 to 4, it is characterized in that, described in fly bar two side arms and be arched arm.

6. dielectric filter according to claim 5, is characterized in that, described arched arm is vertical with the axial line of the resonant column being coupled with it, and crossing with the magnetic line of force of this resonant column.

7. dielectric filter according to claim 5, is characterized in that, described arched arm is single line shape, and the resonant column being coupled with it arranges with one heart.

8. according to the dielectric filter described in any one in claim 1 to 4, it is characterized in that, described resonant column is TE mould dielectric resonance post.

9. dielectric filter according to claim 8, is characterized in that, described dielectric filter also comprises a resonator, for being coupled with described two resonators respectively, to form cross coupling dielectric filter.