CN2684390Y - Low loss high selectivity high power multi-cavity filter - Google Patents
Low loss high selectivity high power multi-cavity filter Download PDFInfo
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- CN2684390Y CN2684390Y CN 200320110871 CN200320110871U CN2684390Y CN 2684390 Y CN2684390 Y CN 2684390Y CN 200320110871 CN200320110871 CN 200320110871 CN 200320110871 U CN200320110871 U CN 200320110871U CN 2684390 Y CN2684390 Y CN 2684390Y
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Abstract
The utility model discloses a low loss high selectivity high power multi-cavity filter, comprising a cavity resonator main body, a covering plate, an inner conductor, an adjusting screw for resonance frequency, an input interface device and an output interface device. The main body is a double-rectangular chamber which is parallel and integrated, the covering plate is positioned on two ends of the double-rectangular chamber, and the main body is provided with even cavity resonators; the cavity resonators on two sides of the main body are distributed-type coupling cavities which are symmetric in manner of comb shape, and two cavity resonators on the middle position are coaxial resonant cavities which are centralized and coupled. The manners of the organic combinations of the distributed coupling and the centralized coupling are adopted, the requests of low loss and high selectivity are both satisfied; the low loss high selectivity high power multi-cavity filter has simple structure, small volume, technology simplification, low consumable, good homogeneity of product, high production efficiency and low cost; the low loss high selectivity high power multi-cavity filter can conduct one-time forming by extrusion processes and can design corresponding mould according to different requests of the performance, the volume and the size of the filter, and diversified large-scale production is realized; the low loss high selectivity high power multi-cavity filter has wide usage and provides an ideal core filtering device for the wireless communication engineering.
Description
Affiliated technical field
The utility model relates to the microwave filter of using in a kind of wireless communication field, and particularly a kind of energy is by powerful low loss high selectivity multicavity filter.
Background technology
In all kinds of Wireless Telecom Equipments of modern times, for example GSM/CDMA/PCS/DCS mobile communication high-power wireless base station, Digital Clustering high-power wireless base station etc. all need a kind of can be by high-power and have the high selectivity energy and the as far as possible little again wave filter technology of loss, and the various critical components that go out based on this art designs, as place the duplexer of base station, place the tower amplifier under the antenna for base station, and place that the base station delivery outlet is used for high-power amplification close road splitter or the like.But, with regard to present technical merit, can pass through powerful filter for one, want to obtain simultaneously low drain performance and high selection performance, also exist many technological difficulties.Because low-loss and high selectivity are a pair of difficult contradiction to overcome.Existing TEM film multicavity filter has two kinds of versions commonly used: the multicavity filter of distributed couplings and the adjustable multicavity filter of centralized coupling.The former generally in the main body that conventional cast processes the broach shape insert a plurality of inner wires, be formed centrally a plurality of rectangular cavities in inner wire being, screw in the resonance frequency adjustment screw relative from the cavity opposite side with inner wire, the filter two ends have end plate, and input and output connector joins with filter two ends cavity respectively.This Filter Design is ripe with manufacturing, it is also less to insert loss, the problem that exists is the Fixed Design that is coupled as between the adjacent resonators, passband width is non-adjustable, be unfavorable for the design and the manufacturing of many kinds series of products, and when passband width required constriction, the distributed couplings district extended thereupon, increased the volume of filter.The latter mostly is that rotary-cut processes a plurality of cylindrical cavities (or rectangular cavity) in the bulk metal piece, also has inner wire and resonance frequency adjustment screw, has intercommunicating pore between the adjacent resonators, in the intercommunicating pore place, regulates the coupling amount between the resonant cavity by the extrapolation screw rod.The major advantage of this filter is that after product was made, performances such as ripple, input vswr fully be adjusted to and reach satisfactory result in can and being with passband width.The problem that exists is that screw device is relatively more clumsy, and the insertion loss is also bigger, and under the more situation of resonant cavity requirement, difficulty of processing increases, and technological debugging work is quite loaded down with trivial details, complicated, time-consuming.Since the last century the nineties, in land mobile communication system and digital clustering communication system, generally adopt the adjustable multicavity filter of a kind of centralized coupling (Motorola Inc., Ericsson, Korea S KMW Inc. all adopt this filter product), in the main body of bulk metal piece, process a plurality of rectangles or cylindrical coaxial cavity that honeycomb fashion is arranged, cylindrical inner conductor is installed in the chamber, must from body portion from upper cover plate screw in the resonance frequency adjustment screw corresponding with inner wire, increased the difficulty of Installation and Debugging.The filter of this structure mainly relies on the cross section that enlarges coaxial cavity, improve the precision of machining and plating measures such as (for example electroplates) is carried out on the surface reduced its loss, improve its optionally approach mainly be reasonable arrangement between the chamber, and increase the separate space coupled structure and realize the separate space coupling.Its shortcoming mainly is a high material consumption, and the processing technology complexity requires height, and difficulty is big, and production efficiency is low, the production cost height.
Summary of the invention
Technical problem to be solved in the utility model is, overcomes the shortcoming of prior art, a kind of novel structure is provided and can passes through powerful low loss high selectivity multicavity filter.
The technical scheme that its technical problem that solves the utility model adopts is as follows: the high-power multicavity filter of a kind of low loss high selectivity, have resonant cavity main body, cover plate, inner wire, resonance frequency adjustment screw, input/output interface device, it is characterized in that main body is the double square chamber of parallel one, cover plate is positioned at two ends, double square chamber, has the even number resonant cavity in the main body, the distributed couplings chamber that its both sides resonant cavity is the comb shape symmetry, the coaxial resonant cavity that two resonant cavitys in middle part are centralized coupling.
Manufacturing process of the present utility model comprises the steps:
1, according to the corresponding main body mould of Design of Filter parameter manufacturing (double square chamber or many rectangular cavity) with parallel one,
2, squeeze out the main body section bar by the large-size extruder heating,
3, according to filter Len req size cutting section bar, make main body,
4, according to concentrating coupling parameter to require the physical dimension of two resonant cavitys in design middle part and processing, promptly on the space bar of chamber, process corresponding breach,
5, assembling inner wire, resonance frequency adjustment screw and input/output interface device,
6, assembling two end cover plate, so far, filter product of the present invention manufacturing finishes.
The beneficial effects of the utility model are as follows:
1, the mode that the multicavity filter coupled modes adopt distributed couplings and centralized coupling to organically combine, learn from other's strong points to offset one's weaknesses, overcome the deficiency of mode separately, coupling is symmetrical fully between the chamber on both sides, adopt low-loss distributed couplings mode between each chamber, and the coupling in two chambeies, middle part is independently single, adopt centralized coupling can realize that cavity configuration turns round in the middle part, reduce the length of filter, the even number cavity configuration is divided into two adjacent same sections of front and back in addition, the centre only separates one deck thin plate, have coupling path between multiple chamber, be convenient to carry out the separate space coupling, thereby can improve the selection performance of filter to a great extent, therefore, Filter Structures of the present invention has been taken into account the requirement of low-loss and high selectivity.
2, performance of filter is superior, the reliability height, of many uses, can design serial multicavity filter, close the road splitter with its duplexer, the tower amplifier that improves the mobile communication base station performance and base station power amplification that serves as mobile communication, microwave radio relay communication, digital cluster communication and wireless access base station can be designed in the basis, and the combiner of Digital Clustering duplexer and frequency diversity preselection filter or the like, for wireless communication engineering provides a kind of ideal kernel filter device.
3, filter construction is simple, compact, ingenious, and volume is little, and debugging work load reduces; processing technology is simplified greatly, and its main body can be by ripe aluminum extrusion process one-shot forming, and the filter of same type only need leave a kind of mould; number of molds is few; thoroughly change the processing technology of traditional centralized coupling filter, and product repetition high conformity, do not need coating surface; consumptive material is few; the production efficiency height, production cost can reduce by 80%, is easy to realize the large-scale production of many kinds.
Description of drawings
Fig. 1 is the monnolithic case schematic diagram of 1 one eight cavity filters of the utility model embodiment.
Fig. 2 is the internal structure schematic diagram of embodiment 1 eight cavity filters.
Fig. 3 is the test characteristic figure of embodiment 1 under no separate space coupling situation.
Fig. 4 is that embodiment 1 is at the test characteristic figure that has under three, the six chamber separate space coupling situations.
Fig. 5 is that embodiment 1 is at the test characteristic figure that has under two, the seven chamber separate space coupling situations.
To be the utility model embodiment 2 form the structural representation of duplexer by one eight cavity filter and one six cavity filter to Fig. 6.
Fig. 7 connects to form the structural representation that tower amplifier or base station power amplifier close the road splitter for the utility model embodiment 3 by four cavity filter duplexs of the utility model six cavity filters and two common distributed couplings.
Embodiment
With reference to the accompanying drawings and in conjunction with the embodiments the utility model is described in detail.But the utility model is not limited to given embodiment.
As depicted in figs. 1 and 2, example 1 is one eight cavity filter, has resonant cavity main body 1, cover plate 2, inner wire 3, resonance frequency adjustment screw 4, input/output interface device 5, main body 1 is the double square chamber of parallel one, cover plate 2 is positioned at two ends, double square chamber, have eight resonant cavity Q1-8 in the main body, its both sides resonant cavity Q1-3 and Q6-8 are the distributed couplings chamber of comb shape symmetry, two the resonant cavity Q4 in middle part, Q5 is the coaxial resonant cavity of centralized coupling, 6 signal Q4 among the figure, the breach of Q5 chamber space bar, 41 is compensated regulation screw between the chamber, and 7 is filter installing and locating limit.In embodiment as shown in the figure, further feature is to have a separate space coupling device 8, between between three, six liang of chambeies or two, seven liang of chambeies, makes the utility model filter have better selection performance.Structural parameters are in the example 1: the wide * height=242*129*78mm of the long * of filter, rectangular cavity wall thickness 5mm, the thick 3mm of cover plate.Physical parameter is: centre frequency fo 800MHz-1000MHz is adjustable, and passband width Δ F3db 10MHz-50MHz is adjustable, and selectivity Δ F40db/ Δ F3db 1.12 inserts loss L smaller or equal to 0.35db, and the input standing wave is smaller or equal to 1.2db.
The manufacturing process of example 1 but increases a step as previously mentioned before the assembling two end cover plate: require to install the separate space coupling device according to selectivity.
As Fig. 3, Fig. 4 and shown in Figure 5, three kinds of test waveform explanations the utility model filter under no separate space coupling situation has just possessed goodish selection performance, and after the separate space coupling device is installed, it selects performance further to improve, and the separate space coupling effect between two, seven liang of chambeies is better than three, six liang of separate space coupling effects between the chamber.
As a same reason, the utility model can also be even number multicavity filters such as six chambeies, ten chambeies, 12 chambeies, just differs at this and one has given an example.
Can form required filtering device by two and the above isometric contour parallel one of the utility model multicavity filter, also can form required filtering device integratedly by the utility model filter is parallel with one and above isometric contour common multicavity filter, its manufacturing technology steps and aforementioned basic identical, but this moment, the main body mould should be many rectangular cavity of parallel one, squeezed out the main body section bar of the parallel one of many rectangular cavity by the large-size extruder heating.
As shown in Figure 6, the utility model embodiment 2 provides by one eight cavity filter and one six duplexer that cavity filter is formed.Eight cavity filters and the parallel one of six cavity filters and isometric contour, have two outputs 5 and a duplexing link 51, has separate space coupling device 8 between two, seven liang of chambeies of eight cavity filters or three, six liang of chambeies, has separate space coupling device 8 between two, five liang of chambeies of six cavity filters, same Fig. 2 of all the other labels among the figure.Structural parameters are in the example 2: the wide * height=209*166*78mm of the long * of duplexer, a wide 50mm of rectangular cavity of six cavity filters, a wide 35mm of rectangular cavity of eight cavity filters, rectangular cavity wall thickness 5mm, the thick 3mm of cover plate.Physical parameter is: six cavity filters: centre frequency fo 800MHz-1000MHz is adjustable, and passband width Δ F3db 10MHz-50MHz is adjustable, and selectivity Δ F40db/ Δ F3db 1.65 inserts loss L smaller or equal to 0.3db, and the input standing wave is smaller or equal to 1.2db; Eight cavity filters: centre frequency fo 800MHz-1000MHz is adjustable, and passband width Δ F3db 10MHz-50MHz is adjustable, and selectivity Δ F40db/ Δ F3db 1.12 inserts loss L smaller or equal to 0.45db, and the input standing wave is smaller or equal to 1.2db.
The manufacturing process of example 2 is with example 1, but the main body mould is four rectangular cavity of parallel one, and increases a step before the assembling two end cover plate: the input/output unit that closes the road shunt structure is installed according to the function and usage needs.
As shown in Figure 7, the utility model embodiment 3 provides tower amplifier or the base station power amplifier that four cavity filter duplexs by the utility model six cavity filters and two common distributed couplings connect to form and closes the road splitter.Six cavity filters and two the four parallel one of cavity filter and isometric contour have between two, five liang of chambeies of two outputs 5 and two duplexing link 51, six cavity filters and have separate space coupling device 8.Same Fig. 2 of all the other labels among the figure.The structural parameters of example 3 are with example 2, physical parameter is: six cavity filter centre frequency fo 800MHz-1000MHz are adjustable, and passband width Δ F3db 10MHz-50MHz is adjustable, selectivity Δ F40db/ Δ F3db 1.65, insert loss L smaller or equal to 0.3db, the input standing wave is smaller or equal to 1.2db; Four cavity filter centre frequency fo800MHz-1000MHz are adjustable, and passband width Δ F3db 10MHz-50MHz is adjustable, and selectivity Δ F40db/ Δ F3db 2.8 inserts loss L smaller or equal to 0.25db, and the input standing wave is smaller or equal to 1.2db.
The manufacturing process of example 3 is with example 2.
Claims (9)
1, the high-power multicavity filter of low loss high selectivity, have resonant cavity main body, cover plate, inner wire, resonance frequency adjustment screw, input/output interface device, it is characterized in that main body is the double square chamber of parallel one, cover plate is positioned at two ends, double square chamber, has the even number resonant cavity in the main body, the distributed couplings chamber that its both sides resonant cavity is the comb shape symmetry, the coaxial resonant cavity that two resonant cavitys in middle part are centralized coupling.
2, the high-power multicavity filter of low loss high selectivity according to claim 1 is characterized in that having eight resonant cavitys in the described main body.
3, the high-power multicavity filter of low loss high selectivity according to claim 2 is characterized in that having the separate space coupling device between two, seven liang of chambeies of described eight resonant cavitys or between three, six liang of chambeies.
4, the high-power multicavity filter of low loss high selectivity according to claim 1 is characterized in that having six resonant cavitys in the described main body.
5, the high-power multicavity filter of low loss high selectivity according to claim 4 is characterized in that having the separate space coupling device between two, five liang of chambeies of described six resonant cavitys.
6, the high-power multicavity filter of low loss high selectivity according to claim 1, it is characterized in that having two groups of double square chambeies in the described main body, have eight resonant cavitys in one group of double square chamber, have six resonant cavitys in another group double square chamber, the both sides resonant cavity of eight resonant cavitys and six resonant cavitys all is the distributed couplings chamber of comb shape symmetry, and two resonant cavitys in middle part all are the coaxial resonant cavity of centralized coupling.
7, the high-power multicavity filter of low loss high selectivity according to claim 6, it is characterized in that between two, seven liang of chambeies of described eight resonant cavitys or three, six liang of chambeies, having the separate space coupling device, between two, five liang of chambeies of described six resonant cavitys, have the separate space coupling device.
8, the high-power multicavity filter of low loss high selectivity according to claim 1, it is characterized in that having two groups of double square chambeies in the described main body, have six resonant cavitys in one group of double square chamber, the distributed couplings chamber that its both sides resonant cavity is the comb shape symmetry, two coaxial resonant cavities that resonant cavity is centralized coupling of middle part, the resonant cavity that has four distributed couplings in each rectangular cavity in another group double square chamber.
9, the high-power multicavity filter of low loss high selectivity according to claim 8 is characterized in that having the separate space coupling device between two, five liang of chambeies of described six resonant cavitys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320110871 CN2684390Y (en) | 2003-11-18 | 2003-11-18 | Low loss high selectivity high power multi-cavity filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320110871 CN2684390Y (en) | 2003-11-18 | 2003-11-18 | Low loss high selectivity high power multi-cavity filter |
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| CN2684390Y true CN2684390Y (en) | 2005-03-09 |
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| CN 200320110871 Expired - Lifetime CN2684390Y (en) | 2003-11-18 | 2003-11-18 | Low loss high selectivity high power multi-cavity filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102683778A (en) * | 2012-04-23 | 2012-09-19 | 安徽科瑞达通信科技有限公司 | GSM compact type filter |
| CN104659445A (en) * | 2015-01-21 | 2015-05-27 | 江苏贝孚德通讯科技股份有限公司 | Band-pass filter |
| CN104702308A (en) * | 2014-12-12 | 2015-06-10 | 庄昆杰 | Micro structure MiMo radio frequency front end assembly |
-
2003
- 2003-11-18 CN CN 200320110871 patent/CN2684390Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102683778A (en) * | 2012-04-23 | 2012-09-19 | 安徽科瑞达通信科技有限公司 | GSM compact type filter |
| CN104702308A (en) * | 2014-12-12 | 2015-06-10 | 庄昆杰 | Micro structure MiMo radio frequency front end assembly |
| CN104659445A (en) * | 2015-01-21 | 2015-05-27 | 江苏贝孚德通讯科技股份有限公司 | Band-pass filter |
| CN104659445B (en) * | 2015-01-21 | 2017-05-31 | 江苏贝孚德通讯科技股份有限公司 | A kind of bandpass filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20131118 Granted publication date: 20050309 |