CN205069820U - Little volume integral style dielectric filter - Google Patents
Little volume integral style dielectric filter Download PDFInfo
- Publication number
- CN205069820U CN205069820U CN201520800934.3U CN201520800934U CN205069820U CN 205069820 U CN205069820 U CN 205069820U CN 201520800934 U CN201520800934 U CN 201520800934U CN 205069820 U CN205069820 U CN 205069820U
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- China
- Prior art keywords
- circuit board
- capacitance sheet
- printed circuit
- layer
- dielectric filter
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Abstract
The utility model provides a little volume integral style dielectric filter, include syntonizer and the shielded enclosure who sets up the cavity, shielded enclosure's cavity internal stability is equipped with printed circuit board, the last welding of printed circuit board has capacitor sheet, the silver layer has all been plated on capacitor sheet's two sides, is equipped with the load layer on capacitor sheet's the silver layer, is equipped with the link between two liang of load layers, and capacitor sheet's another side silver layer both ends are equipped with input electrode and output electrode, the syntonizer passes through the pin welding on capacitor sheet's loading layer, shielded enclosure's both ends are connected with the insulator respectively, the one end of insulator stretch into in the metal shielding shell with printed circuit board connects. It has smallly, and the bandwidth is wide, and the distal end restraines advantage such as good.
Description
Technical field
The utility model relates to field of microwave communication, refers more particularly to bandwidth ratio wider, the split type dielectric filter of the small size that far-end suppresses, second harmonic is farther.
Technical background
In field of microwave communication, filter has can allow useful signal is zero-decrement as far as possible to be passed through, the decay large as far as possible to unwanted signal and eliminate the device of jamming incoherent signal, and it is subject to production firm as a kind of important communication apparatus and more and more payes attention to.
In recent years, volume is little, Insertion Loss is low, the feature of good stability because having for dielectric filter, has both been widely used in mobile communication system, satellite communication system and cable television system, also for specific communication engineering.Because existing equipment wants cube little, cost is low, good stability, then proposes outside high standard to the electrical property of filter for filter, also requirements at the higher level are proposed to its packaging technology, reliability etc., require filter to have high suppression, wideband filtering, second harmonic are farther.Dielectric filter generally divides the large type with Split type structure two that is structure as a whole, wherein the feature squareness factor of integrative-structure is good, loss is little, suppress near-end to get well, but its far-end is poor comparatively speaking, and second harmonic is closer, and the restriction ratio of integrative-structure to bandwidth is more; And Split type structure can to realize bandwidth ratio wider, far-end suppresses, and second harmonic is farther, but existing Split type structure all to there is volume large, be not suitable with the requirement of existing equipment.
Utility model content
The split type dielectric filter of small size that the purpose of this utility model is to provide that a kind of volume is little, wideband filtering, far-end have suppressed.
The technical scheme realizing described object is:
The split type dielectric filter of a kind of small size, comprise resonator and the shield shell offering cavity, printed circuit board is installed with in the cavity of described shield shell, described printed circuit board is welded with capacitance sheet, the two sides of described capacitance sheet is all silver coated, a silver layer of capacitance sheet is provided with loading layer, is provided with coupling line between two between loading layer, and the another side silver layer two ends of capacitance sheet are provided with input electrode and output electrode; Described resonator is welded on the loading layer of capacitance sheet by pin; The two ends of described shield shell are connected to insulator, and one end of described insulator is stretched in metal screen case and is connected with described printed circuit board.
Described resonator is the square body that ceramic dielectric is made, and its inside offers a circle and runs through through hole;
The cavity hatch end of described shield shell is provided with cover plate, and the surface of described shield shell and cover plate is all coated with one deck silver layer.
Described capacitance sheet to be dielectric constant be 20 potsherd.
In the utility model, the cavity size of shield shell decides according to the number of designed resonator; The loading layer of capacitance sheet, input electrode and output electrode are all the formation wet out pattern by photoetching on the surface silver layer of capacitance sheet on mask aligner, also can be passed through screen printing net plate printing and form.Capacitance sheet requires leaching silver evenly, and silver thickness is suitable, and solderability is relatively good, is beneficial to welding like this, good stability.Resonator requires that Q value is high, and the higher Insertion Loss of Q value is less, and leaching silver requires that evenly solderability is relatively good, is beneficial to welding like this, and stability is better.
A silver layer of capacitance sheet is provided with input electrode, output electrode, the size of electrode can be changed as required, make relative bandwidth wider.
Dielectric filter of the present utility model is combined by several single hole ceramic resonator, then realize filter function by the coupling that ceramic condenser sheet realizes between each resonator with this.It has, and volume is little, bandwidth ratio is wider, and far-end suppresses, and the advantage such as second harmonic is farther.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model,
Fig. 2 is the front view of capacitance sheet in the utility model,
Fig. 3 is the rearview of capacitance sheet in the utility model,
Fig. 4 is the structural representation of shield shell in the utility model,
Fig. 5 is equivalent circuit diagram of the present utility model.
Embodiment
Further illustrate below in conjunction with accompanying drawing, the present embodiment is described as follows for the filter of 7 device body compositions that shake:
As shown in Figure 1, the split type dielectric filter of a kind of small size, comprise resonator 1 and offer the shield shell 3(of cavity as shown in Figure 4), printed circuit board 5 is installed with in the cavity of described shield shell 3, described printed circuit board 5 is welded with capacitance sheet 2, and the two sides of described capacitance sheet 2 is all silver coated, and a silver layer of capacitance sheet 2 is provided with loading layer 6, be provided with coupling line 7 between loading layer 6 between two, the another side silver layer two ends of capacitance sheet 2 are provided with input electrode 2-1 and output electrode 2-2; Described resonator 1 is welded on the loading layer 6 of capacitance sheet 2 by pin; The two ends of described shield shell 3 are connected to insulator 4, and one end of described insulator 4 is stretched in metal screen case 3 and is connected with described printed circuit board 5.
The square body that described resonator 1 is made for ceramic dielectric, its inside offers a circle and runs through through hole;
The cavity hatch end of described shield shell 3 is provided with cover plate, and the surface of described shield shell 3 and cover plate is all coated with one deck silver layer.
Described capacitance sheet 2 for dielectric constant be the potsherd of 20.
As shown in Figure 2,3, a silver layer of capacitance sheet 2 there are six coupling lines 7-1,7-2,7-3,7-4,7-5,7-6 by mask aligner photoetching, form seven loading layers 6-1,6-2,6-3,6-4,6-5,6-6,6-7.The another side silver layer two ends photoetching of capacitance sheet 2 has input electrode 2-1 and output electrode 2-2.
Each resonator 1 is all the upper surfaces being welded on each loading layer by pin.Resonator is coupled by the coupling line be located between two between loading layer, and each coupling line determines the power of each resonator.Resonator wherein on loading layer 6-2 is by coupling line 7-1, 7-2 is coupled, resonator on loading layer 6-3 is by coupling line 7-2, 7-3 is coupled, resonator on loading layer 6-3 is by coupling line 7-3, 7-4 is coupled, resonator on loading layer 6-4 is by coupling line 7-4, 7-5 is coupled, resonator on loading layer 6-5 is by coupling line 7-5, 7-6 is coupled, resonator on resonator on loading layer 6-1 and loading layer 6-6 is all by coupling line 7-1, 7-6 is coupled.Coupling line 7-1,7-6 coupling is the strongest under normal circumstances, and coupling line 7-2,7-5 take second place, and coupling line 7-3,7-4 coupling is relatively the most weak.
As shown in Figure 5, L1 and C2, L2 and C4.......L7 and C14 form seven resonance frequencies respectively, seven resonators namely in the utility model; C1 and C15 is the coupling of output electrode 2-2 and input electrode 2-1, and C3 is coupling line 7-1, C5 be coupling line 7-2, C7 be coupling line 7-3, C9 be coupling line 7-4, C11 be coupling line 7-5, C15 is coupling line 7-6.
Its waveform is surveyed to filter of the present utility model, its centre frequency 2650MHz, passband width 2300-3000MHz, passband internal loss is less than 1.5dB, passband fluctuation 1.0,1900MHz degree of suppression is greater than 75dB, and 1800MHz and following degree of suppression are greater than 80dB35000-5000 degree of suppression and are greater than 60dB.
Above embodiment is not limited only to protection range of the present utility model, all modify based on basic thought of the present utility model or change all belong to protection range of the present utility model.
Claims (4)
1. the split type dielectric filter of small size, comprise resonator (1) and offer the shield shell (3) of cavity, it is characterized in that: in the cavity of described shield shell (3), be installed with printed circuit board (5), described printed circuit board (5) is welded with capacitance sheet (2), the two sides of described capacitance sheet (2) is all silver coated, a silver layer of capacitance sheet (2) is provided with loading layer (6), is provided with coupling line (7) between two between loading layer (6); The another side silver layer two ends of capacitance sheet (2) are provided with input electrode (2-1) and output electrode (2-2); Described resonator (1) is welded on the loading layer (6) of capacitance sheet (2) by pin; The two ends of described shield shell (3) are connected to insulator (4), and one end of described insulator (4) is stretched in metal screen case (3) and is connected with described printed circuit board (5).
2. the split type dielectric filter of a kind of small size according to claim 1, it is characterized in that: the square body that described resonator (1) is made for ceramic dielectric, its inside offers a circle and runs through through hole.
3. the split type dielectric filter of a kind of small size according to claim 1, it is characterized in that: the cavity hatch end of described shield shell (3) is provided with cover plate, the surface of described shield shell (3) and cover plate is all coated with one deck silver layer.
4. the split type dielectric filter of a kind of small size according to claim 1, is characterized in that: described capacitance sheet (2) for dielectric constant be the potsherd of 20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520800934.3U CN205069820U (en) | 2015-10-13 | 2015-10-13 | Little volume integral style dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520800934.3U CN205069820U (en) | 2015-10-13 | 2015-10-13 | Little volume integral style dielectric filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205069820U true CN205069820U (en) | 2016-03-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520800934.3U Expired - Fee Related CN205069820U (en) | 2015-10-13 | 2015-10-13 | Little volume integral style dielectric filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205069820U (en) |
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2015
- 2015-10-13 CN CN201520800934.3U patent/CN205069820U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160302 Termination date: 20181013 |