CN101877426A - Dielectric filter and production method thereof - Google Patents

Dielectric filter and production method thereof Download PDF

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Publication number
CN101877426A
CN101877426A CN2009102609598A CN200910260959A CN101877426A CN 101877426 A CN101877426 A CN 101877426A CN 2009102609598 A CN2009102609598 A CN 2009102609598A CN 200910260959 A CN200910260959 A CN 200910260959A CN 101877426 A CN101877426 A CN 101877426A
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dielectric
electrode
filter
silver
end faces
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CN101877426B (en
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庞照勇
王瑾
谢伦琛
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Huawei Technologies Co Ltd
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Abstract

The invention provides a dielectric filter and a production method thereof. The dielectric filter comprises a dielectric body, a plurality of end surface electrodes, a copper layer, an input electrode and an output electrode, wherein a plurality of through holes are arranged between the two end surfaces of the dielectric body to form a plurality of filtering units; the end surface electrodes and the filtering units are arranged on the same end surface of the dielectric body in the way of one to one correspondence, and the end surface electrodes are made of silver and are covered by a protective layer; the copper layer covers the surface of the dielectric body, excluding the surface covered by the protective layer; the input electrode and the output electrode are respectively arranged on the two opposite side surfaces except the two end surfaces of dielectric body, and extend to the same side surface of the dielectric body, excluding the two end surfaces and the two side surfaces. The dielectric filter has the advantages of simple process, low cost and high reliability.

Description

Dielectric filter and manufacture method thereof
Technical field
The present invention relates to communication technical field, relate in particular to a kind of dielectric filter and manufacture method thereof.
Background technology
In each standard communication base station equipment such as GSM, CDMA, WCDMA, TD-SCDMA, Wimax, LTE, all need to use the frequency medium filter.In communication apparatus, require filter to have following performance, Insertion Loss is little, filtering performance good, reliability is high.Dielectric filter is that the electrode by media ceramic with given shape and ceramic surface is constituted.General single copper electrode or the silver electrode of adopting of existing dielectric filter.And there are a lot of inferior positions in actual applications in the unitary electrode filter, as satisfying the requirement of Performance And Reliability simultaneously.Copper electrode Design of Filter mode is single, can't realize variation, and the conductivity of copper electrode relatively silver be low, be difficult to realize high performance filter.There is welding corrode problem in the silver electrode filter, and has failure mode such as sulfuration, and long-term reliability is poor.The integrated cost height of unitary electrode filter.
Introduce existing independent copper electrode material medium Filter Structures and preparation technology below.Metallize-electroless copper at the media ceramic all surface, re-plating copper then with the laser ablation electrode pattern, comprises forming input, o pads electrode and open circuit end electrode.But the conductivity of copper electrode is not high enough, causes the filter Insertion Loss bigger.Copper-plating technique is difficult to realize end face variation electrode pattern, causes performance such as the outer inhibition of device band can't satisfy the product design requirement.Be not suitable for, filtering performance demanding application scenario low to Insertion Loss.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of dielectric filter and manufacture method thereof, is used for solving the technical problem of poor performance that prior art unitary electrode dielectric filter exists, cost height, long-term reliability difference.
The embodiment of the invention provides a kind of dielectric filter, comprise dielectric, offer a plurality of through holes between two end faces of dielectric and form a plurality of filter units, this filter also comprises: a plurality of end electrodes, described a plurality of end electrode and described filter unit be corresponding one by one to be arranged on the same end face of described dielectric, and described a plurality of end electrodes are made from silver and protective mulch; The copper layer covers the surface of described dielectric except that described protective layer; Input electrode and output electrode are separately positioned on two relative outside described two end faces of described dielectric sides, and extend on the same side of described dielectric except that described two end faces and two sides.
The embodiment of the invention also provides a kind of manufacture method of dielectric filter, this method comprises: be provided with and the corresponding silvery end electrode of described filter unit on an end face of the dielectric with a plurality of filter units, described a plurality of filter units are to offer a plurality of through holes to make between two end faces of described dielectric; Armor coated on described end electrode; On the surface of described dielectric except that described protective layer, form the copper layer; Described copper layer on two relative outside two end faces of described dielectric sides forms input electrode and output electrode respectively, and described input electrode and output electrode extend on the same side of described dielectric except that described two end faces and two sides.
The embodiment of the invention adopts at the ceramic dielectric surface selectivity silver metallized and copper metallization, and filter open circuit end face silver electrode carried out the technological means that local positioning applies, it is simple that the dielectric filter that the embodiment of the invention is provided has technology, and cost is low, the beneficial effect that reliability is high.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is the structural representation of the dielectric filter of the embodiment of the invention one;
Fig. 2 is preparation method's the flow chart of the dielectric filter of the embodiment of the invention two.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer,, the embodiment of the invention is described in further details below in conjunction with embodiment and accompanying drawing.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
Embodiment one
Present embodiment provides a kind of dielectric filter.The dielectric that has a plurality of filter units at first is provided, and described a plurality of filter units are to offer a plurality of through holes to form between two end faces of dielectric, and this is a prior art, does not repeat them here.See also Fig. 1, as shown in Figure 1, described dielectric filter also comprises:
A plurality of end electrodes 102; described a plurality of end electrode 102 is corresponding one by one with described filter unit; the all corresponding end electrode 102 of each filter unit; and these end electrodes 102 all are arranged on the same end face of described dielectric; described a plurality of end electrode 102 is made from silver, and reaches the purpose of protection and insulation at its surface coverage protective layer.
Copper layer 103 covers the surface of described dielectric except that described protective layer; Described copper layer 103 is to form by electroless copper and two steps of electro-coppering, because dielectric is not a metal, generally many is material with the pottery, can only be undertaken by the electroless copper mode in ceramic surface copper facing, but because electroless copper does not reach the thickness that needs, after electroless copper, electroplate again, to reach desired thickness.
Input electrode 104a and output electrode 104b are separately positioned on two relative outside described two end faces of described dielectric sides, and extend on the same side of described dielectric except that described two end faces and two sides.In the present embodiment, dielectric is an example with the ceramic block of cuboid, but is not limited thereto, can be with other geometries of actual needs, and as square etc.In the ceramic block of this cuboid, offer a plurality of through holes with formation filter unit 111 between two end faces, and around each through hole of same end face, make end electrode 102, can form the inductance capacitance equivalent electric circuit between through hole and the adjacent face electrode and be used for filtering.
End electrode 102 is made from silver, and can burn attached fixing then by forming pattern with the silk screen printing of silver slurry according to the needs that performance of filter designs.Be specifically as follows and carry out silver slurry deposition on the media ceramic surface and burn attachedly, and one of them end face of polishing forms the particular design electrode pattern at end face again.Silver slurry deposition is that ceramic all surface is carried out.The polishing end face is to carry out after silver slurry deposition burning is attached.Being intended that for surface deposition is burnt attached electrode of sanding operation removed, and exposes ceramic body, can make other needed pattern at ceramic surface like this.With the surface of polishing upwards, silk screen is fixed on the pottery top, and silver-colored slurry can be penetrated on the surface from the mesh position of silk screen, the distribution that the silver that the pattern of silk screen has just been determined permeate is starched, thus form certain pattern on the surface.Attached by burning then, the volatile matter of silver slurry is removed, the silver burning is attached to ceramic surface, thereby makes that certain adhesive strength is arranged between silver and the ceramic body.
Form electromagnetic coupled between the end electrode 102 that is equipped with as the through hole and the silvery of filter unit 111 and carry out filtering, therefore between filter unit 111 and the end electrode 102 distance can influence the performance of filter, concrete distance is definite by the performance index requirement of filter.
The end face at end electrode 102 places except that filter unit 111 via openings the part coated with resins or glass as protective layer; wherein resin need have thermal endurance; with the high temperature that prevents to weld protective layer is caused damage; so the thermal endurance of resin need be higher than welding temperature; as the temperature of welding 240 ℃-250 ℃ the time; can select thermal endurance to be not less than 260 ℃ the solid resin of temperature; as the organosilicon fire resistant resin; perhaps other have the fire resistant resin of this specific character; if select glass for use; can be the low temperature Pyrex, the back that is heating and curing forms the end electrode 102 that resin covers.
In dielectric four sides other, select corresponding a pair of except two end faces, input electrode 104a and output electrode 104b will be set at this on to the side, and described input electrode 104a and output electrode 104b extend in two sides of residue on the same side.
Described input electrode 104a and the concrete technology of output electrode 104b can for:
At first, form copper layer 103 by metallization copper facing, as electroless copper and electro-coppering, in the real work operation, first electroless copper is electroplated then, to realize needed thickness of coating.Copper layer 103 surface of overwrite media body except that coated with resins, comprise the cuboid dielectric four sides, with end electrode 102 place end face and opposing end faces, and the surface of filter unit 111 through holes on the both ends of the surface.Etch groove by the described copper layer 103 on one group of relative in four sides of lithographic methods such as laser to dielectric side at last, and extend in two sides of residue on the same side, form " isolated island " that disconnects with peripheral copper layer 103, so just form input electrode 104a and output electrode 104b respectively.
Present embodiment is by the silver metallized and copper metallization at the ceramic dielectric surface selectivity, and the welding corrode that can evade the silver electrode filter lost efficacy, and the Insertion Loss of copper electrode filter is big, performance of filter difference and can't realize the shortcoming of somewhat complex design; Apply by filter open circuit end face silver electrode is carried out local positioning, can overcome the risk of silver electrode filter welding corrode inefficacy and long-term reliability poor (sulfuration was lost efficacy).
Embodiment two
Present embodiment provides a kind of preparation method of dielectric filter.As shown in Figure 2, this method comprises:
Step 201: be provided with and the corresponding silvery end electrode of described filter unit on an end face of the dielectric with a plurality of filter units, described a plurality of filter units are to offer a plurality of through holes to make between two end faces of described dielectric;
In this step, the ceramic block that can select cuboid is as dielectric.Filter unit is a plurality of through holes that pass two end faces of cuboid, can form inductance capacitance between through hole and the adjacent through-holes electrode and be used for filtering, specifically can by mill, the preparation of machining process such as car.
With filter unit end electrode is set one to one on an end face of dielectric, this end electrode is with the design needs formation silver electrode of silver slurry silk screen printing according to performance of filter, burns attached this silver electrode pattern of fixing then.Distance between filter unit and the silver electrode can influence the performance of filter, and concrete distance is required to determine by the performance index of filter.
Step 202: protective mulch on described end electrode;
In this step; the part of end face except that the filter unit via openings at the silver electrode place is armor coated; can be resin or glass; wherein resin need have thermal endurance; with the high temperature that prevents to weld protective layer is caused damage; so the thermal endurance of resin need be higher than welding temperature; as the temperature of welding 240 ℃-250 ℃ the time; can select thermal endurance to be not less than 260 ℃ the solid resin of temperature; as the organosilicon fire resistant resin, perhaps other have fire resistant resin and other materials of this specific character, if select glass for use; can be the low temperature Pyrex, the heating resin solidification forms the open circuit end electrode 102 that resin covers.
Step 203: on the surface of described dielectric except that described resin bed, form the copper layer;
In this step, the copper facing of metallizing on the surface of dielectric except that coated with resins forms the copper layer, comprise the rectangle dielectric four sides, end electrode place end face and with end electrode place end face opposing end faces, and the surface of filtering cell via on the both ends of the surface.Concrete technology comprises electroless copper and electro-coppering, electroplates after chemical plating, to realize needed thickness of coating again.
Step 204: the described copper layer on two relative outside two end faces of described dielectric sides forms input electrode and output electrode respectively, and described input electrode and output electrode extend on the same side of described dielectric except that described two end faces and two sides.
In this step, in four sides except that two end faces of dielectric, select a pair of relative side, this forms input electrode and output electrode to the described copper layer on the relative side by the laser ablation medium block, and extend in two sides of residue on the same side, specifically be on the copper layer of side, to etch groove, form " isolated island " that disconnects with peripheral copper layer with laser.
Resin-coating technology provided by the invention is equally applicable to other silver electrode device, and mixed electrode technology provided by the invention is equally applicable to other copper electrode device.
Present embodiment is by the silver metallized and copper metallization at the ceramic dielectric surface selectivity, and the welding corrode that can evade the silver electrode filter lost efficacy, the Insertion Loss of clothes copper electrode filter is big, the performance of filter difference and can't realize somewhat complex design shortcoming; By being carried out local positioning, filter open circuit end face silver electrode applies, shortcoming, and the while also can overcome the risk of silver electrode filter welding corrode inefficacy and long-term reliability poor (sulfuration was lost efficacy).
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a dielectric filter comprises dielectric, offers a plurality of through holes between two end faces of dielectric and forms a plurality of filter units, it is characterized in that this filter also comprises:
A plurality of end electrodes, described a plurality of end electrodes and described filter unit be corresponding one by one to be arranged on the same end face of described dielectric, and described a plurality of end electrodes are made from silver and protective mulch;
The copper layer covers the surface of described dielectric except that described protective layer;
Input electrode and output electrode are separately positioned on two relative outside described two end faces of described dielectric sides, and extend on the same side of described dielectric except that described two end faces and two sides.
2. dielectric filter according to claim 1 is characterized in that: described end electrode has pattern, and starches silk screen printing and burn attached making by silver.
3. dielectric filter according to claim 1 is characterized in that: described protective layer is resin bed or glassy layer.
4. dielectric filter according to claim 3 is characterized in that: described resin is for having the solid resin of stable on heating temperature; Described glass is the low temperature Pyrex.
5. dielectric filter according to claim 1 is characterized in that: described copper layer is made by electroless copper and electro-coppering.
6. the manufacture method of a dielectric filter is characterized in that, this method comprises:
Be provided with and the corresponding silvery end electrode of described filter unit on an end face of the dielectric with a plurality of filter units, described a plurality of filter units are to offer a plurality of through holes to make between two end faces of described dielectric;
Armor coated on described end electrode;
On the surface of described dielectric except that described protective layer, form the copper layer;
Described copper layer on two relative outside two end faces of described dielectric sides forms input electrode and output electrode respectively, and described input electrode and output electrode extend on the same side of described dielectric except that described two end faces and two sides.
7. method according to claim 6 is characterized in that, the step that the open circuit end electrode is set comprises:
Form the silver electrode pattern with the silk screen printing of silver slurry;
The silver electrode pattern is burnt attached fixing.
8. method according to claim 6 is characterized in that: this protective layer is resin bed or glassy layer.
9. method according to claim 8 is characterized in that, the step that applies described resin bed comprises:
With the solid described open circuit end electrode of resin-coating of temperature;
Described resin is heating and curing.
10. method according to claim 6 is characterized in that, the step that forms the copper layer comprises:
Electroless copper;
Electro-coppering.
CN 200910260959 2009-12-17 2009-12-17 Dielectric filter and production method thereof Expired - Fee Related CN101877426B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111048874A (en) * 2019-12-11 2020-04-21 深圳市华臻科技有限公司 Dielectric filter and method for manufacturing the same
CN114792876A (en) * 2021-01-25 2022-07-26 南京以太通信技术有限公司 Method for manufacturing dielectric filter and method for manufacturing electrode thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3750335B2 (en) * 1998-01-05 2006-03-01 株式会社村田製作所 Band stop dielectric filter, dielectric duplexer, and communication device
CN2684389Y (en) * 2004-03-23 2005-03-09 严盛喜 Ultra high frequency joint-body multi-cavity patch filter
CN2867620Y (en) * 2005-08-19 2007-02-07 浙江正原电气股份有限公司 Ceramic dielectric filter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111048874A (en) * 2019-12-11 2020-04-21 深圳市华臻科技有限公司 Dielectric filter and method for manufacturing the same
CN114792876A (en) * 2021-01-25 2022-07-26 南京以太通信技术有限公司 Method for manufacturing dielectric filter and method for manufacturing electrode thereof
CN114792876B (en) * 2021-01-25 2024-04-02 南京以太通信技术有限公司 Method for manufacturing dielectric filter and method for manufacturing electrode thereof

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