CN203180029U - Cavity filter and radio frequency communication device - Google Patents
Cavity filter and radio frequency communication device Download PDFInfo
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- CN203180029U CN203180029U CN 201320130321 CN201320130321U CN203180029U CN 203180029 U CN203180029 U CN 203180029U CN 201320130321 CN201320130321 CN 201320130321 CN 201320130321 U CN201320130321 U CN 201320130321U CN 203180029 U CN203180029 U CN 203180029U
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Abstract
The utility model discloses a cavity filter and a radio frequency communication device. The cavity filter comprises a cavity body, a cover plate disposed on the cavity body in a sealed manner, and a resonator disposed in the cavity body. One end of the resonator body is connected with a bottom part of the cavity body, and the other end is provided with at least a flange body having an annular-shaped upper flange structure. A position of the cover plate opposite to the resonator is provided with at least an annular-shaped groove, in which is extended the upper flange structure of the flange body in a non-contact manner. The cavity filter has advantages of high Q value, far secondary harmonic, good temperature stability, and applicability in design and application of mini-sized products.
Description
Technical field
The utility model relates to a kind of cavity body filter and radio communication device.
Background technology
Filter is widely used in the communications field as a kind of frequency selection device, in the communication base station system, is mainly used in selecting signal of communication, clutter or interference signal that the filtering communication signal frequency is outer.Filter can be divided into microstrip filter, interdigital filter, coaxial cavity filter, waveguide filter, pectinate line cavity filter, helical cavity filter, small-sized lumped parameter filter, Ceramic Dielectric Filter, SIR (step electric impedance resonator) filter, high temperature superconducting materia etc. by the transmission line classification.
Because coaxial cavity filter is fit to large-scale production very much, and cost is also very cheap, therefore, adopt coaxial cavity filter in the base station system mostly.Coaxial cavity filter comprises cavity, cover plate, resonator and tuning screw rod, and resonator is fixed in the cavity, cover plate capping cavity; One end of tuning screw rod penetrates the hollow space that cover plate inserts the resonator body of rod, regulates tuning screw rod again to meeting radio-frequency (RF) index, at last tuning screw rod is fixed on the described cover plate.
The resonant cavity of coaxial cavity filter can equivalence be the LRC resonant circuit generally, and according to coupled resonance microwave filter principle, the band connection frequency of coaxial cavity filter is determined by the resonant cavity frequency, resonant cavity frequency such as following formula:
By above formula as can be known, when resonant cavity size more hour, its capacitor C just reduces, then band connection frequency is more high, otherwise then more low.In the filter design, when required band connection frequency requirement is very low, just need to increase the size of resonant cavity or the quantity that increases resonant cavity, and this has caused all the change of cavity body filter size big; When the size of described cavity has been carried out clear and definite restriction, just can not satisfy the requirement of the size of low frequency and restriction simultaneously, just can satisfy low band connection frequency, can guarantee not increase the size of cavity again.
The utility model content
Cavity body filter can not satisfy defectives such as low frequency and small size to the utility model simultaneously in the prior art in order to solve, and a kind of cavity body filter and radio communication device are provided.
For realizing above-mentioned utility model purpose, the utility model is by the following technical solutions: a kind of cavity body filter, comprise the cover plate of cavity, the described cavity of capping and be located at the interior resonator of described cavity, described resonator body one end is connected with described cavity bottom, and the other end is provided with the flange body that comprises at least one ring-type upper overturning structure; Described cover plate is provided with at least one annular groove over against the position of described resonator, and the upper overturning structure of described flange body extends in the described groove, and described upper overturning structure does not contact with described groove.
According to cavity body filter of the present utility model, described ring-type upper overturning structure is the torus coaxial with the resonator body, and described groove is the toroidal cavity that cooperates with described torus.
According to cavity body filter of the present utility model, described toric internal diameter is greater than the internal diameter of described resonator body.
According to cavity body filter of the present utility model, described ring-type upper overturning structure is the incomplete torus coaxial with the resonator body, and described groove is the incomplete annular groove that cooperates with incomplete torus.
According to cavity body filter of the present utility model, described incomplete toric internal diameter is all greater than the internal diameter of described resonator body.
According to cavity body filter of the present utility model, described groove hollows out the indent moulding by described cover plate, and perhaps described groove is formed by extended muscle on the described cover plate.
According to cavity body filter of the present utility model, described cavity body filter also comprises tuning screw rod, and described tuning screw rod penetrates described cover plate and extends in the hollow hole on the described resonator body.
According to cavity body filter of the present utility model, described resonator body is provided with the flange body that comprises two each and every one ring-type upper overturning structures; Cover plate is provided with two annular grooves over against the position correspondence of described resonator.
The utility model also provides a kind of radio communication device, comprises each described cavity body filter of claim 1 to 8, and described radio communication device mainly contains mixer, duplexer and tower amplifier.
A kind of cavity body filter of the utility model, with respect to prior art, by be provided with the flange body that comprises at least one ring-type upper overturning structure at the resonator body, and be provided with at least one annular groove at cover plate over against the position of resonator, the upper overturning structure of flange body extends in the groove, and the upper overturning structure does not contact with described groove.Thereby make the upper overturning structure of resonant rod and the groove corresponding matching of cover plate, resonator flange and cover plate form very big interdigital capacitor, can reduce resonance frequency to a great extent.Because open end has very big loading capacitance, and what fill is air dielectric, loss is very little, compare helix filter and medium loads filter, cavity body filter of the present utility model has higher Q value, second harmonic far away, temperature stability is good, and the design of particularly suitable miniaturization product is used.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the utility model embodiment, the accompanying drawing of required use is done to introduce simply in will describing embodiment below.
Fig. 1 is the cutaway view of a kind of embodiment of the utility model cavity body filter;
Fig. 2 is the resonator three-dimensional structure diagram of cavity body filter among Fig. 1;
Fig. 3 is the three-dimensional structure diagram of the cover plate of cavity body filter among Fig. 1.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment one
As shown in Figure 1, present embodiment provides a kind of cavity body filter 100, comprises the cover plate 20 of cavity 10, capping cavity 10 and is located at resonator 30 in the cavity 10.Cavity body filter 100 also comprises tuning screw rod 40, and tuning screw rod 40 penetrates cover plate 20 and extends in the hollow hole on resonator 30 bodies.
Calculate formula according to the resonant cavity resonance frequency:
When L or C become big, frequency f will descend.According to the capacity plate antenna computing formula:
The upper overturning structure 311 of resonator 30 open ends of this programme (being the end that resonator 30 has flange body 31) and cover plate 20 upper grooves 21 extend to come and are equivalent to capacity plate antenna, because upper overturning structure 311 is longer, so it is big much that S becomes, under the certain situation of the gap d between upper overturning structure 311 and the groove 21, it is big much that capacity plate antenna c becomes, so the resonance frequency f of resonant cavity descends, and can reduce resonance frequency to a great extent.Because the resonator open end has very big loading capacitance, and what fill is air dielectric, and loss is very little, and higher Q value is arranged, far second harmonic, and temperature stability is good, the design application of particularly suitable miniaturization product.
As Fig. 1～shown in Figure 3, in the present embodiment, the flange body 31 on the resonator 30 is provided with and turns on two all over structure 311, and cover plate 20 is provided with two annular grooves 21 over against the position of resonator 30.Though turnup structure 311 and annular groove 21 are The more the better, can increase interdigital capacitor like this, but because in the cavity body filter of miniaturization, the inner space of cavity 10 is less, can arrange the space of turnup structure 311 limited, therefore adopt two and turn over all over structure 311 and two annular groove 21 correspondences, can realize bigger interdigital capacitor, be convenient to make moulding again.
In embodiment as shown in Figure 1, ring-type upper overturning structure 311 is the torus coaxial with resonator 30 bodies, and groove 21 is the toroidal cavity that cooperates with torus, and toric internal diameter is greater than the internal diameter of resonator 30 bodies.Obviously, in other embodiments, ring-type upper overturning structure 311 is the incomplete torus coaxial with resonator 30 bodies, and groove 21 is the incomplete annular groove that cooperates with incomplete torus, and incomplete toric internal diameter is all greater than the internal diameter of resonator 30 bodies.
Preferably, as shown in Figure 3, groove 21 is formed by extended muscle 22 on the cover plate 20.Obviously, in other embodiments, groove 21 hollows out the indent moulding by cover plate 20.
Embodiment two
A kind of radio communication device originally is provided, comprises cavity body filter, described radio communication device mainly contains mixer, duplexer and tower amplifier.Cavity body filter comprises the cover plate of cavity, the described cavity of capping and is located at resonator in the cavity, and resonator body one end is connected with cavity bottom, and the other end is provided with the flange body that comprises at least one ring-type upper overturning structure; Cover plate is provided with at least one annular groove over against the position of resonator, and the upper overturning structure of flange body extends in the groove, and the upper overturning structure does not contact with groove.The concrete structure of cavity body filter is described in detail at preamble, so this repeats no more again.
Used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for those of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (9)
1. a cavity body filter comprises the cover plate of cavity, the described cavity of capping and is located at the interior resonator of described cavity, it is characterized in that,
Described resonator body one end is connected with described cavity bottom, and the other end is provided with the flange body that comprises at least one ring-type upper overturning structure;
Described cover plate is provided with at least one annular groove over against the position of described resonator, and the upper overturning structure of described flange body extends in the described groove, and described upper overturning structure does not contact with described groove.
2. cavity body filter according to claim 1 is characterized in that, described ring-type upper overturning structure is the torus coaxial with the resonator body, and described groove is the toroidal cavity that cooperates with described torus.
3. cavity body filter according to claim 2 is characterized in that, described toric internal diameter is greater than the internal diameter of described resonator body.
4. cavity body filter according to claim 1 is characterized in that, described ring-type upper overturning structure is the incomplete torus coaxial with the resonator body, and described groove is the incomplete annular groove that cooperates with incomplete torus.
5. cavity body filter according to claim 4 is characterized in that, described incomplete toric internal diameter is all greater than the internal diameter of described resonator body.
6. cavity body filter according to claim 1 is characterized in that, described groove hollows out the indent moulding by described cover plate, and perhaps described groove is formed by extended muscle on the described cover plate.
7. cavity body filter according to claim 1 is characterized in that, described cavity body filter also comprises tuning screw rod, and described tuning screw rod penetrates described cover plate and extends in the hollow hole on the described resonator body.
8. cavity body filter according to claim 1 is characterized in that, described resonator body is provided with the flange body that comprises two each and every one ring-type upper overturning structures; Cover plate is provided with two annular grooves over against the position correspondence of described resonator.
9. a radio communication device is characterized in that, comprises each described cavity body filter of claim 1 to 8, and described radio communication device mainly contains mixer, duplexer and tower amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320130321 CN203180029U (en) | 2013-03-20 | 2013-03-20 | Cavity filter and radio frequency communication device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320130321 CN203180029U (en) | 2013-03-20 | 2013-03-20 | Cavity filter and radio frequency communication device |
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| CN203180029U true CN203180029U (en) | 2013-09-04 |
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| CN 201320130321 Expired - Lifetime CN203180029U (en) | 2013-03-20 | 2013-03-20 | Cavity filter and radio frequency communication device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280617A (en) * | 2013-05-15 | 2013-09-04 | 成都联帮微波通信工程有限公司 | Small cavity filter |
| CN104269592A (en) * | 2014-10-16 | 2015-01-07 | 成都联帮微波通信工程有限公司 | Miniaturized cavity filter, multiplexer and combiner |
| CN104795615A (en) * | 2014-01-22 | 2015-07-22 | 鸿富锦精密工业（深圳）有限公司 | Cavity filter |
| CN106463811A (en) * | 2014-04-02 | 2017-02-22 | 安德鲁无线系统有限公司 | Microwave cavity resonator |
-
2013
- 2013-03-20 CN CN 201320130321 patent/CN203180029U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280617A (en) * | 2013-05-15 | 2013-09-04 | 成都联帮微波通信工程有限公司 | Small cavity filter |
| CN103280617B (en) * | 2013-05-15 | 2015-04-01 | 成都联帮微波通信工程有限公司 | Small cavity filter |
| CN104795615A (en) * | 2014-01-22 | 2015-07-22 | 鸿富锦精密工业（深圳）有限公司 | Cavity filter |
| CN106463811A (en) * | 2014-04-02 | 2017-02-22 | 安德鲁无线系统有限公司 | Microwave cavity resonator |
| CN106463811B (en) * | 2014-04-02 | 2019-09-20 | 安德鲁无线系统有限公司 | Microwave cavity resonator |
| CN104269592A (en) * | 2014-10-16 | 2015-01-07 | 成都联帮微波通信工程有限公司 | Miniaturized cavity filter, multiplexer and combiner |
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Granted publication date: 20130904 |
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| CX01 | Expiry of patent term |