CN202308260U - Resonant rod of cavity filter and cavity filter - Google Patents
Resonant rod of cavity filter and cavity filter Download PDFInfo
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- CN202308260U CN202308260U CN2011204478546U CN201120447854U CN202308260U CN 202308260 U CN202308260 U CN 202308260U CN 2011204478546 U CN2011204478546 U CN 2011204478546U CN 201120447854 U CN201120447854 U CN 201120447854U CN 202308260 U CN202308260 U CN 202308260U
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- resonant rod
- metal
- cavity
- metal dish
- filter
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Abstract
The utility model discloses a resonant rod of a cavity filter and a cavity filter, which relate to electronic accessories applied to the field of wireless communication. By means of improvement of the resonant rod, at least two metal discs are fixed on a hollow metal cylinder. After the improvement, resonant frequency can be effectively lowered, miniaturization is achieved, and power capacity is improved.
Description
Technical field
The utility model relates to the electronic components that are used for wireless communication field, relates in particular to a kind of cavity body filter and resonant rod structure thereof.
Background technology
At present, in wireless communication base station system, generally use the cavity body filter of high power capacity to reduce the spuious and external interference of base station as the radio-frequency front-end device.Cavity body filter generally includes the main body of a metal material; On main body, be provided with cavity; Establish resonant rod in the cavity, on main body, also be provided with the input, the output that penetrate the chamber wall, input, output comprise respectively and are used for the metal transmission line that is connected with resonant rod.In the conventional coaxial cavity filter that use the base station, its resonant rod is generally the hollow metal cylinder; Perhaps as shown in Figure 1, be a metal dish 11 and hollow metal cylinder 12 syndetons, be provided with screw hole 13 (disk type metal resonant rod) in hollow metal cylinder 12 bottom surfaces.Under the situation lower in some frequency ranges, that volume is restricted, adopt aforementioned existing conventional resonant rod to be difficult to realize the filter index, perhaps because of the not enough sparking easily of power capacity.
The utility model content
The technical problem underlying that the utility model will solve is, a kind of resonant rod and cavity body filter of cavity body filter is provided, and it can effectively reduce resonance frequency, realizes miniaturization, and improves power capacity.
For solving the problems of the technologies described above, the utility model provides a kind of resonant rod of cavity body filter, comprises the hollow metal cylinder of being with screw hole, is fixed with at least two metal dish on the said hollow metal cylinder.
Said hollow metal cylinder is coaxial with each metal dish, leaves the gap between each metal dish.
Said metal dish is fixed on opposite side relative with screw hole on the hollow metal cylinder.
Saidly be provided with two metal dish, be respectively metal dish one and metal dish two, said metal dish one is measure-alike with metal dish two shapes.
Said hollow metal cylinder and the metal dish structure that is formed in one.
Said metal dish is circular ring body.
Said hollow metal cylinder and metal dish are iron or brass material.
A kind of cavity body filter comprises a main body that is provided with cavity, is provided with the resonant rod like aforesaid cavity body filter in the said cavity.
Also be provided with the metal cap body that is used for enclosed cavity on the said main body.
Be provided with three cavitys on the said main body altogether.
Be provided with screwed hole near the cavity place on the said main body, said metal cap body is connected with main body through the screw of mate with threaded holes.
The beneficial effect of the utility model is: a kind of resonant rod of cavity body filter and cavity body filter; Improvement through to resonant rod is fixed with at least two metal dish on the hollow metal cylinder; Can effectively reduce resonance frequency after the improvement, realize miniaturization, and improve power capacity.
Description of drawings
Fig. 1 is existing disk type metal resonant rod sketch map;
Fig. 2 is the structural representation of a kind of embodiment of resonant rod of the utility model cavity body filter;
Fig. 3 is the cutaway view of Fig. 2;
Fig. 4 is the structural representation of a kind of embodiment of the utility model cavity body filter;
Fig. 5 is embodiment illustrated in fig. 3 and common three cavity filter S21 parameter curves contrast sketch map.
Embodiment
Combine accompanying drawing that the utility model is done further explain through embodiment below.
Refer again to Fig. 1; Present industry cavity body filter commonly used; When frequency was lower, height-limited, in order to improve power capacity, the resonant rod that is adopted was the disk type metal resonant rod; Metal dish 11 is fixed on filter cavity inside through screw hole 13 with this disk type metal resonant rod above hollow metal cylinder 12.The method can reduce frequency, increases power capacity, but little under harsh more situation at volume, sometimes this method also difficulty prove effective.
As scheme Fig. 2 and shown in Figure 3, and a kind of embodiment of resonant rod of cavity body filter, the metal resonant rod metal dish that it is provided with two annulars is respectively metal dish 1 and metal dish 2 22.Metal dish 2 22 is under metal dish 1, and two disk concentrics.Metal dish 1 and metal dish 2 22 the first half at hollow metal cylinder 23; Form a cavity 25 in the hollow metal cylinder 23; The bottom of hollow metal cylinder 23 has a screw hole 24, two disk type metal resonant rods to be fixed on filter cavity inside through this screw hole 24.Metal dish 1, metal dish 2 22 and hollow cylinder 23 are one-body molded, can be accomplished by lathe machining.
When implementing, said hollow metal cylinder 23 (metal resonant rod 42 mobile jibs) is one-body molded with metal dish.
When implementing, the metal dish of said resonant rod 42 is provided with quantity can be more than or equal to two.
When implementing, the metal dish edge of said resonant rod 42 can be circular configuration, also can be square or other shape.
When implementing, said resonant rod 42 is processed for metal, said metal finger brass or iron.
As shown in Figure 4, a kind of embodiment of cavity body filter comprises that the main body 41 of a metal material, the two ends of this main body 41 are respectively equipped with input 43 and output 44, are used for this filter is connected with other radio-frequency devices (like power amplifier, antenna etc.).Also have three cavitys 45 in this example filter main body 41, thereby be used to make up three cavity filters; Be installed in respectively like aforesaid resonant rod 42 in the cavity 45 of main body 41, input 43 and output 44 reach signal in the filter from port connector through metal transmission line 46 respectively.Also be provided with screwed hole 47 simultaneously, can metal cover board be installed in main body 41 tops through screwed hole 47, thereby with main body 41 sealings.
See also Fig. 5, be the embodiment (three cavity filters) and the existing common three cavity filter S21 parameter curves contrast sketch map of aforementioned cavities fluid filter.The band connection frequency that three common cavity filter 1dB insert loss is 940MHz-952.7MHz; And the band connection frequency of the utility model cavity body filter 1dB insertion loss is 929.3MHz-941.9MHz; The band connection frequency of comparing three common cavity filters has moved down 10MHz, thereby has realized the miniaturization function.And if in the cavity of equal height; Reach same frequency; The resonant rod 42 of the utility model cavity body filter will design shortlyer than common single-deck formula resonant rod; Therefore the distance apart from cover plate of resonant rod 42 top disc is greater than common single-deck formula filter, thereby power capacity is greater than the power capacity of single-deck formula filter.
The utility model cavity body filter also can be provided with one two, perhaps more than three cavitys 45 on the main body 41 when implementing.Cavity 45 also can adopt other sealing mode.
During enforcement, if the sealing mode adopts cover plate, cover plate is connected forms such as also can adopting welding with main body 41.
During enforcement, main body 41 can be done any distortion with reference to prior art.
During enforcement, said input/output end port connector can be connectors commonly used such as N type, SMA type or Din type.
Above content is the further explain that combines concrete execution mode that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under the utility model, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the protection range of the utility model.
Claims (10)
1. the resonant rod of a cavity body filter comprises the hollow metal cylinder (23) of being with screw hole (13), it is characterized in that: be fixed with at least two metal dish on the said hollow metal cylinder (23).
2. the resonant rod of cavity body filter as claimed in claim 1 is characterized in that, said hollow metal cylinder (23) is coaxial with each metal dish, leaves the gap between each metal dish.
3. the resonant rod of cavity body filter as claimed in claim 2 is characterized in that, said metal dish is fixed on hollow metal cylinder (23) and goes up and the relative opposite side of screw hole (13).
4. the resonant rod of cavity body filter as claimed in claim 3 is characterized in that, saidly is provided with two metal dish, is respectively metal dish one (21) and metal dish two (22), and said metal dish one (21) is identical with metal dish two (22) geomeries.
5. like the resonant rod of each described cavity body filter of claim 1 to 4, it is characterized in that said hollow metal cylinder (23) and the metal dish structure that is formed in one.
6. the resonant rod of cavity body filter as claimed in claim 5 is characterized in that, said metal dish is circular ring body.
7. the resonant rod of cavity body filter as claimed in claim 5 is characterized in that, said hollow metal cylinder (23) and metal dish are iron or brass material.
8. a cavity body filter comprises a main body (41) that is provided with cavity (45), it is characterized in that said cavity is provided with the resonant rod like each described cavity body filter of claim 1 to 7 in (45).
9. cavity body filter as claimed in claim 8 is characterized in that, said main body also is provided with the metal cap body that is used for enclosed cavity (45) on (41).
10. like claim 8 or 9 described cavity body filters, it is characterized in that, be provided with three cavitys (45) on the said main body (41) altogether.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204478546U CN202308260U (en) | 2011-11-14 | 2011-11-14 | Resonant rod of cavity filter and cavity filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204478546U CN202308260U (en) | 2011-11-14 | 2011-11-14 | Resonant rod of cavity filter and cavity filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202308260U true CN202308260U (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204478546U Expired - Lifetime CN202308260U (en) | 2011-11-14 | 2011-11-14 | Resonant rod of cavity filter and cavity filter |
Country Status (1)
| Country | Link |
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| CN (1) | CN202308260U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832428A (en) * | 2012-09-18 | 2012-12-19 | 南京广顺网络通信设备有限公司 | Intermediate/low-frequency band high-rejection duplexer for radio-frequency signal |
-
2011
- 2011-11-14 CN CN2011204478546U patent/CN202308260U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832428A (en) * | 2012-09-18 | 2012-12-19 | 南京广顺网络通信设备有限公司 | Intermediate/low-frequency band high-rejection duplexer for radio-frequency signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120704 |
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| CX01 | Expiry of patent term |