CN109861664A - A kind of narrow bend ceramic filter - Google Patents
A kind of narrow bend ceramic filter Download PDFInfo
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- CN109861664A CN109861664A CN201810920879.XA CN201810920879A CN109861664A CN 109861664 A CN109861664 A CN 109861664A CN 201810920879 A CN201810920879 A CN 201810920879A CN 109861664 A CN109861664 A CN 109861664A
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- ceramic resonator
- ceramic
- resonator
- variable capacitor
- parallel
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- 239000000919 ceramic Substances 0.000 title claims abstract description 109
- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 229910052573 porcelain Inorganic materials 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 12
- 238000003754 machining Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The present invention is a kind of narrow bend ceramic filter, is connected and is composed in parallel by ceramic resonator；The ceramic resonator includes a ceramic resonator D, a parallel variable capacitor Cf, a series capacitance C；A pin of the ceramic resonator D connects one end of parallel variable capacitor Cf, another pin connects one end of series capacitance C, the other end of parallel variable capacitor Cf is connected with the other end of series capacitance C, the common end that a pin of ceramic resonator D is connected with one end of parallel variable capacitor Cf forms a pin of ceramic resonator, and the open end that the other end of parallel variable capacitor Cf is connected with the other end of series capacitance C forms another pin of ceramic resonator.Narrow bend ceramic filter in the present invention can carry out frequency trim by adjusting parallel variable capacitor Cf due to the parallel variable capacitor Cf in ceramic resonator.
Description
Technical field
The present invention relates to filter field, in particular to a kind of narrow bend ceramic filter.
Background technique
Existing narrow band filter is ceramic resonator piece ladder-type filter, and filter internal uses multiple ceramic resonator pieces
Trapezoidal connection type is combined into a complete narrow band filter using the series-parallel characteristic of ceramic resonator piece.Due to existing
Narrow band filter requires the frequency error of single ceramic resonator piece minimum, and in ceramic resonance piece processing link, machining is missed
Difference is the main reason for leading to ceramic frequency error, so, in the fabrication process, machining accuracy is controlled and is required and its tight
Lattice, rejection rate is very high in process, and production efficiency is low.Therefore, currently, the manufacturer of the such narrow band filter of all productions
Wholly off production, after the halt production of existing narrow band filter, newly developed narrow-band communication equipments can only use extensive DSP number
Word traffic filter, hardware design need software programming cooperation debugging, and the product design period is long, and design cost is high, leads to big portion
The product cost pressure abruptly increase for dividing added value low, is unable to satisfy middle-end market demand.
Summary of the invention
The present invention in the fabrication process, requires machining accuracy control and its tight aiming at narrow bend ceramic filter
Lattice, rejection rate is very high in process, the low deficiency of production efficiency, provides a kind of narrowband and holds ceramic filter.
The technical scheme is that a kind of narrow bend ceramic filter, is connected and is composed in parallel by ceramic resonator；It is described
Ceramic resonator include a ceramic resonator D, a parallel variable capacitor Cf, a series capacitance C；The ceramics vibration
A pin for swinging device D connects one end of parallel variable capacitor Cf, another pin connects one end of series capacitance C, parallel variable capacitor
The other end of Cf is connected with the other end of series capacitance C, one end of a pin and parallel variable capacitor Cf of ceramic resonator D
Connected common end forms a pin of ceramic resonator, and the other end of parallel variable capacitor Cf is another with series capacitance C's
The connected open end in end forms another pin of ceramic resonator.
Narrow bend ceramic filter in the present invention can pass through adjusting due to the parallel variable capacitor Cf in ceramic resonator
Parallel variable capacitor Cf can carry out frequency trim, can suitably relax the centre frequency error of ceramic resonator, do not need as
The manufacturing process of traditional narrow ceramic filter is completely dependent on mechanical lapping machining accuracy to guarantee the frequency essence of ceramic resonance piece
Degree, reduces manufacture difficulty of processing, considerably reduces manufacturing cost.
Further, in above-mentioned narrow bend ceramic filter: including ceramic resonator A, ceramic resonator B, ceramic resonance
Device C, ceramic resonator D, ceramic resonator E, ceramic resonator F, ceramic resonator G, ceramic resonator H；Ceramic resonator H with
Ceramic resonator D series connection, ceramic resonator G connects with ceramic resonator C, ceramic resonator F connects with ceramic resonator B, makes pottery
Porcelain resonator E is in parallel again after connecting with ceramic resonator A.
The present invention is described in detail in the following with reference to the drawings and specific embodiments.
Detailed description of the invention
Fig. 1 is 1 narrow bend ceramic filter schematic diagram of the embodiment of the present invention.
Fig. 2 is 1 narrow bend ceramic filter test result of the embodiment of the present invention.
Specific embodiment
Embodiment 1, the multiple ceramic resonator series windings of the present embodiment and parallel combination structure, the present embodiment use 4 ceramics
Resonator series winding, four ceramic resonators compose in parallel, as shown in Figure 1, ceramic resonator includes ceramic resonator D, one
A parallel variable capacitor Cf, a series capacitance C；A pin of the ceramic resonator D connects parallel variable capacitor Cf's
One end, another pin connect one end of series capacitance C, and the other end of parallel variable capacitor Cf is connected with the other end of series capacitance C,
One of the common end formation ceramic resonator that a pin of ceramic resonator D is connected with one end of parallel variable capacitor Cf draws
Foot, the open end that the other end of parallel variable capacitor Cf is connected with the other end of series capacitance C form the another of ceramic resonator
A pin.
In the present embodiment, there is eight ceramic resonators, ceramic resonator A, ceramic resonator in narrow bend ceramic filter
B, ceramic resonator C, ceramic resonator D, ceramic resonator E, ceramic resonator F, ceramic resonator G, ceramic resonator H；Pottery
Porcelain resonator H connects with ceramic resonator D, ceramic resonator G connects with ceramic resonator C, ceramic resonator F and ceramic resonance
Device B series connection, ceramic resonator E are in parallel again after connecting with ceramic resonator A.
In the present embodiment, in ceramic resonator, cooperation parallel variable capacitor Cf trimmer forms a complete narrowband
Filter cell.Ceramic resonator centre frequency does not need completely the same, and centre frequency error is by fine tuning partial collimation, in this way
The benefit done is to greatly reduce device screening requirement, shortens production hour, reduces manufacturing cost.
Former filter uses ceramic resonator chip architecture, finely tunes without frequency calibration, and frequency error is completely dependent on mechanical ruler
Very little machining accuracy guarantees.
Ceramic resonator has a series resonance point and a parallel resonant point, utilizes multiple ceramic resonator parallel resonances
Characteristic is formed the rear of narrow band filter and is formed narrow along passband and stopband characteristic using multiple ceramic resonator series resonance characteristics
The forward position passband and stopband characteristic of band filter, multiple ceramic resonators combine the rectangle that can improve narrow band filter in series and parallel
Coefficient and bandwidth, adjustment trimmer can improve the passband fluctuation characteristic and frequency error of narrow band filter.It is to survey shown in Fig. 2
The amplitude-frequency characteristic shown on Network Analyzer when examination.
Claims (2)
1. a kind of narrow bend ceramic filter is connected and is composed in parallel by ceramic resonator；It is characterized by: the ceramic resonance
Device includes a ceramic resonator D, a parallel variable capacitor Cf, a series capacitance C；The one of the ceramic resonator D
A pin connects one end of parallel variable capacitor Cf, another pin connects one end of series capacitance C, the other end of parallel variable capacitor Cf
It is connected with the other end of series capacitance C, a pin of ceramic resonator D is connected public with one end of parallel variable capacitor Cf
End forms a pin of ceramic resonator, the public affairs that the other end of parallel variable capacitor Cf is connected with the other end of series capacitance C
Another pin of beginning formation ceramic resonator.
2. narrow bend ceramic filter according to claim 1, it is characterised in that: including ceramic resonator A, ceramic resonator
B, ceramic resonator C, ceramic resonator D, ceramic resonator E, ceramic resonator F, ceramic resonator G, ceramic resonator H；Pottery
Porcelain resonator H connects with ceramic resonator D, ceramic resonator G connects with ceramic resonator C, ceramic resonator F and ceramic resonance
Device B series connection, ceramic resonator E are in parallel again after connecting with ceramic resonator A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810920879.XA CN109861664A (en) | 2018-08-14 | 2018-08-14 | A kind of narrow bend ceramic filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810920879.XA CN109861664A (en) | 2018-08-14 | 2018-08-14 | A kind of narrow bend ceramic filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109861664A true CN109861664A (en) | 2019-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810920879.XA Pending CN109861664A (en) | 2018-08-14 | 2018-08-14 | A kind of narrow bend ceramic filter |
Country Status (1)
| Country | Link |
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| CN (1) | CN109861664A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4384229A (en) * | 1980-02-14 | 1983-05-17 | Nippon Electric Co., Ltd. | Temperature compensated piezoelectric ceramic resonator unit |
| CN1649265A (en) * | 2004-01-30 | 2005-08-03 | 株式会社东芝 | Regulatable filter and portable telephone |
| US20050280476A1 (en) * | 2004-06-15 | 2005-12-22 | Kabushiki Kaisha Toshiba | Filter control apparatus and filter system |
| CN101904096A (en) * | 2007-12-14 | 2010-12-01 | Acp尖端电路钻研股份公司 | Variable inductor |
| CN208128208U (en) * | 2018-08-14 | 2018-11-20 | 深圳芯珑电子技术有限公司 | A kind of narrow bend ceramic filter |
-
2018
- 2018-08-14 CN CN201810920879.XA patent/CN109861664A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4384229A (en) * | 1980-02-14 | 1983-05-17 | Nippon Electric Co., Ltd. | Temperature compensated piezoelectric ceramic resonator unit |
| CN1649265A (en) * | 2004-01-30 | 2005-08-03 | 株式会社东芝 | Regulatable filter and portable telephone |
| US20050280476A1 (en) * | 2004-06-15 | 2005-12-22 | Kabushiki Kaisha Toshiba | Filter control apparatus and filter system |
| CN101904096A (en) * | 2007-12-14 | 2010-12-01 | Acp尖端电路钻研股份公司 | Variable inductor |
| CN208128208U (en) * | 2018-08-14 | 2018-11-20 | 深圳芯珑电子技术有限公司 | A kind of narrow bend ceramic filter |
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