CN204348875U - A kind of Ceramic Dielectric Filter with absorbing resonant cavity - Google Patents
A kind of Ceramic Dielectric Filter with absorbing resonant cavity Download PDFInfo
- Publication number
- CN204348875U CN204348875U CN201520008115.5U CN201520008115U CN204348875U CN 204348875 U CN204348875 U CN 204348875U CN 201520008115 U CN201520008115 U CN 201520008115U CN 204348875 U CN204348875 U CN 204348875U
- Authority
- CN
- China
- Prior art keywords
- dielectric filter
- loading layer
- layer
- filter body
- resonant cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model provides a kind of Ceramic Dielectric Filter with absorbing resonant cavity, comprise by dielectric filter body, pcb board and shield shell, the two ends of described dielectric filter body top end face are provided with output electrode and input electrode, and the dielectric filter body top end face being positioned at each through hole surrounding is equipped with loading layer; Described input electrode is positioned at the end of last loading layer, and described output electrode is positioned at second loading layer front end; Last loading layer described and second loading layer are adjacent between loading layer and are provided with inductance coupling high; Loading layer between inductance coupling high is connected to form capacitive coupling by silver layer between any two, and the silver layer be arranged in below capacitive coupling is provided with cross capacitance coupling.Reduce the volume of filter, also reduce its cost; Add one and absorb resonant cavity to control the suppression outside passband, then by arranging cross-couplings between hole, thus reach that Insertion Loss is little, near-end one section suppresses and stability.
Description
Technical field
The utility model relates to field of microwave communication, refers more particularly to the Ceramic Dielectric Filter of the band absorption resonant cavity that volume is little, Insertion Loss is little, near-end one section has suppressed.
Technical background
Microwave filter has the important function such as frequency-selecting, frequency division and isolation signals, and be widely used in the systems such as modern microwave millimetre-wave attenuator, satellite communication, remote sensing and Radar Technology, the quality of its performance will directly have influence on the running quality of whole system.In field of microwave communication, filter is subject to production firm as a kind of important electronic device and more and more payes attention to.In recent years, customer equipment wants that cube is little, cost is low, more and more higher for filter index request, existing dielectric filter generally divides the large type with Split type structure two that is structure as a whole, wherein the feature of integrative-structure is that squareness factor is good, loss is little, suppresses near-end to get well, but far-end wants not good enough comparatively speaking, and more to the restriction ratio of bandwidth; And the squareness factor of Split type structure is poor, loss large, its near-end suppresses poor, but far-end rejection ratio is better, and bandwidth does not have too large restriction.But also there is no at present to meet reduction volume simultaneously, reduce costs while meet near-end one section of dielectric filter suppressed.Therefore, a kind of novel medium filter is needed to solve the problems referred to above.
Utility model content
The purpose of this utility model is just to provide a kind of with absorbing the Ceramic Dielectric Filter of resonant cavity, and the volume realizing filter is little, Insertion Loss is little and near-end suppresses.
The technical scheme realizing described object is:
A kind of Ceramic Dielectric Filter with absorbing resonant cavity, comprise by being provided with the dielectric filter body that multiple through hole forms resonant cavity, the silver coated ceramic body in surface is formed, the bottom of described dielectric filter body is installed on pcb board, the top cover of dielectric filter body has shield shell, the two ends of described dielectric filter body top end face are provided with output electrode and input electrode, and the dielectric filter body top end face being positioned at each through hole surrounding is equipped with loading layer; Described input electrode is positioned at the end of last loading layer, and described output electrode is positioned at second loading layer front end; Last loading layer described and second loading layer are adjacent between loading layer and are provided with inductance coupling high; Loading layer between inductance coupling high is connected to form capacitive coupling by silver layer between any two, and the silver layer be arranged in below capacitive coupling is provided with cross capacitance coupling.
Further scheme, described output, input electrode, capacitive coupling and cross capacitance coupling carry out carving on the top end face silver layer of dielectric filter body by laser machine being formed.
Further scheme, described shield shell forms half folding L shape by packfong pressing and bending, and its surface is silver coated; The surface of described pcb board is coated with layer gold.
Further scheme, the dielectric constant of the ceramic body of described dielectric filter body is 37.
Ceramic Dielectric Filter of the present utility model is made up of dielectric filter body, pcb board and shield shell, and the bottom welding of dielectric filter body is installed on pcb board, and welding upper shield shell in its top is formed.Wherein dielectric filter body is made up of the ceramic body being provided with multiple through hole, outer face silver coated, namely its through hole forms resonant cavity, then with laser machine, the performance pattern designed is carved in the upper surface of dielectric filter body, loading layer is equipped with in each through hole surrounding, form capacitive coupling or inductance coupling high between loading layer, be positioned at below capacitive coupling and be provided with cross capacitance coupling; Input, output electrode has been carved again at its two ends.
Because dielectric filter body is that the ceramic body sintering being 37 by dielectric constant forms, the coaxial resonant cavity formed by multiple isodiametric through hole, and silver coated at its outer surface; The surface of shield shell 2 is also silver coated.Due to and silver-colored conductivity is very large, so make that the insertion loss of Ceramic Dielectric Filter of the present utility model is low and volume is little.In addition in order to better shield effectiveness, the surface gold-plating of pcb board.
The dielectric filter body top end face of each through hole surrounding is equipped with loading layer, and the size of loading layer controls the position of resonant cavity frequency; Be provided with cross capacitance coupling in silver layer below capacitive coupling, it has the advantages that to improve squareness factor, namely respectively forms a flex point at lower sideband, thus the suppress sideband effect of drawing near-end; Output electrode, between first and second loading layer, is in order to control medium filter itself and the size of resonant cavity electrode; And using first resonant cavity as absorption resonant cavity, for balancing the size of filter and resonant cavity electrode.
Absorb resonant cavity to control the suppression outside passband owing to adding one in filter of the present utility model, the position that can change absorbing cavity frequency according to demand and the size changing electrode are to adjust the size of suppression; Cross-couplings again by arranging between through hole makes filter effect better.So the utility model has that volume is little, squareness factor good, Insertion Loss is little and the advantage such as wide-band, and its near-end one section suppresses better, and suppresses to have adjustability.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation,
Fig. 2 is the structural representation of the utility model medium filtering body;
Fig. 3 is the structural representation of shield shell in the utility model;
Fig. 4 is equivalent circuit diagram of the present utility model;
Fig. 5 is measured waveform figure of the present utility model.
Embodiment
The present invention is described for the filter being provided with 8 resonant cavitys:
As shown in Figure 1, a kind of Ceramic Dielectric Filter with absorbing resonant cavity comprises dielectric filter body 2, pcb board 3 and shield shell 1 and forms, and the bottom welding of dielectric filter body 2 is installed on pcb board 3, welding upper shield shell 1 in its top is formed.
As shown in Figure 2, dielectric filter body 2 is for being provided with eight through holes, the two ends of the top end face of dielectric filter body 2 are provided with output electrode 8-2 and input electrode 8-1, the surrounding of the first through hole 4-1 is provided with the first loading layer 5-1, the surrounding of the second through hole 4-2 is provided with the second loading layer 5-2, the surrounding of third through-hole 4-3 is provided with the 3rd loading layer 5-3, the surrounding of fourth hole 4-4 is provided with the 4th loading layer 5-4, the surrounding of fifth hole 4-5 is provided with slender acanthopanax carrier layer 5-5, the surrounding of the 6th through hole 4-6 is provided with the 6th loading layer 5-6, the surrounding of the 7th through hole 4-7 is provided with the 7th loading layer 5-7, the surrounding of the 8th through hole 4-8 is provided with the 8th loading layer 5-8, the end of the 8th loading layer 5-8 is provided with input electrode 8-1, and the front end of the second through hole 4-2 is provided with output electrode 8-2, be provided with the second inductance coupling high 7-2 between 8th loading layer 5-8 and the 7th loading layer 5-7, between the second loading layer 5-2 and the 3rd loading layer 5-3, be provided with the first inductance coupling high 7-1, the first capacitive coupling 6-1 is connected to form by silver layer between 3rd loading layer 5-3 and the 4th loading layer 5-4, the second capacitive coupling 6-2 is connected to form by silver layer between 4th loading layer 5-4 and slender acanthopanax carrier layer 5-5, be connected to form the 3rd capacitive coupling 6-3 by silver layer between slender acanthopanax carrier layer 5-5 and the 6th loading layer 5-6, between the 6th loading layer 5-6 and the 7th loading layer 5-7, be connected to form the 4th capacitive coupling 6-4 by silver layer, be arranged in the first capacitive coupling 6-1, the second capacitive coupling 6-2, the silver layer of below of the 3rd capacitive coupling 6-3 and the 4th capacitive coupling 6-4 is provided with cross capacitance coupling 9.
Be the utility model shield shell structural representation as shown in Figure 3, shield shell 1 forms half folding L shape by packfong pressing and bending, and its surface is silver coated.
Equivalent circuit diagram of the present utility model as shown in Figure 4, wherein C1 and L1, C2 and L2 ...., C8 and L8 form eight resonance frequencies, i.e. eight resonant cavitys respectively; The resonant cavity that C8 and L8 is formed is exactly the absorption resonant cavity in this filter.L9 to be the first inductance coupling high 7-1 between the second loading layer 5-2 in Fig. 2, the 3rd loading layer 5-3, L10 be in Fig. 2 between the 7th loading layer 5-7 and the 8th loading layer 5-8 the second inductance coupling high 7-2; C10, C11, C12, C13 are respectively the first capacitive coupling 6-1, the second capacitive coupling 6-2 in Fig. 2, the 3rd capacitive coupling 6-3 and the 4th capacitive coupling 6-4; C17 is cross coupling capacitor 9; C14, C15 are output electrode 8-2, are coupled by electric capacity with between first and second resonant cavity herein; C9 is input electrode, is the other one end of this filter and being coupled of electrode.
Be illustrated in figure 5 measured waveform figure of the present utility model, its centre frequency 1375MHz, passband width 1350-1405MHz, central point loss is less than 1.5dB, and passband fluctuation 0.5,1320-1200MHz degree of suppression is greater than 40dBc.
The above; being only an example of the present utility model, not for limiting protection range of the present utility model, being anyly familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect, all should be encompassed within protection range of the present utility model.
Claims (4)
1. the Ceramic Dielectric Filter with absorbing resonant cavity, comprise by being provided with the dielectric filter body that multiple through hole forms resonant cavity, the silver coated ceramic body in surface is formed, the bottom of described dielectric filter body is installed on pcb board, the top cover of dielectric filter body has shield shell, it is characterized in that: the two ends of described dielectric filter body top end face are provided with output electrode and input electrode, the dielectric filter body top end face being positioned at each through hole surrounding is equipped with loading layer; Described input electrode is positioned at the end of last loading layer, and described output electrode is positioned at second loading layer front end; Last loading layer described and second loading layer are adjacent between loading layer and are provided with inductance coupling high; Loading layer between inductance coupling high is connected to form capacitive coupling by silver layer between any two, and the silver layer be arranged in below capacitive coupling is provided with cross capacitance coupling.
2. Ceramic Dielectric Filter according to claim 1, is characterized in that: described output, input electrode, capacitive coupling and cross capacitance coupling carry out carving on the top end face silver layer of dielectric filter body by laser machine being formed.
3. Ceramic Dielectric Filter according to claim 1, is characterized in that: described shield shell forms half folding L shape by packfong pressing and bending, and its surface is silver coated; The surface of described pcb board is coated with layer gold.
4. Ceramic Dielectric Filter according to claim 1, is characterized in that: the dielectric constant of the ceramic body of described dielectric filter body is 37.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520008115.5U CN204348875U (en) | 2015-01-07 | 2015-01-07 | A kind of Ceramic Dielectric Filter with absorbing resonant cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520008115.5U CN204348875U (en) | 2015-01-07 | 2015-01-07 | A kind of Ceramic Dielectric Filter with absorbing resonant cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204348875U true CN204348875U (en) | 2015-05-20 |
Family
ID=53232125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520008115.5U Expired - Fee Related CN204348875U (en) | 2015-01-07 | 2015-01-07 | A kind of Ceramic Dielectric Filter with absorbing resonant cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204348875U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960994A (en) * | 2017-04-25 | 2017-07-18 | 四川省韬光通信有限公司 | A kind of dielectric filter be easy to regulating frequency and couple bandwidth |
| CN108565534A (en) * | 2018-02-09 | 2018-09-21 | 嘉兴佳利电子有限公司 | A kind of medium low-pass filter |
| CN110600845A (en) * | 2019-09-20 | 2019-12-20 | 张家港艾富精密机电技术有限公司 | Built-in capacitive cross coupling filter |
| 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 |
| CN113258232A (en) * | 2021-06-18 | 2021-08-13 | 中国电子科技集团公司第二十六研究所 | High-suppression broadband dielectric filter |
| TWI748732B (en) * | 2020-08-20 | 2021-12-01 | 大陸商廈門松元電子有限公司 | Mix different-wavelength resonance band-pass filter with capacitive coupling metal pattern |
| CN117200728A (en) * | 2023-11-07 | 2023-12-08 | 江苏灿勤科技股份有限公司 | Split type band elimination filter with good in-band inhibition effect |
-
2015
- 2015-01-07 CN CN201520008115.5U patent/CN204348875U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960994A (en) * | 2017-04-25 | 2017-07-18 | 四川省韬光通信有限公司 | A kind of dielectric filter be easy to regulating frequency and couple bandwidth |
| CN108565534A (en) * | 2018-02-09 | 2018-09-21 | 嘉兴佳利电子有限公司 | A kind of medium low-pass filter |
| CN108565534B (en) * | 2018-02-09 | 2024-02-13 | 嘉兴佳利电子有限公司 | Dielectric low-pass filter |
| CN110600845A (en) * | 2019-09-20 | 2019-12-20 | 张家港艾富精密机电技术有限公司 | Built-in capacitive cross coupling filter |
| CN110600845B (en) * | 2019-09-20 | 2024-03-26 | 苏州富电通讯有限公司 | Built-in capacitive cross coupling filter |
| 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 |
| TWI748732B (en) * | 2020-08-20 | 2021-12-01 | 大陸商廈門松元電子有限公司 | Mix different-wavelength resonance band-pass filter with capacitive coupling metal pattern |
| CN113258232A (en) * | 2021-06-18 | 2021-08-13 | 中国电子科技集团公司第二十六研究所 | High-suppression broadband dielectric filter |
| CN113258232B (en) * | 2021-06-18 | 2024-03-12 | 中国电子科技集团公司第二十六研究所 | High rejection broadband dielectric filter |
| CN117200728A (en) * | 2023-11-07 | 2023-12-08 | 江苏灿勤科技股份有限公司 | Split type band elimination filter with good in-band inhibition effect |
| CN117200728B (en) * | 2023-11-07 | 2024-02-02 | 江苏灿勤科技股份有限公司 | Split type band elimination filter with good in-band inhibition effect |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204348875U (en) | A kind of Ceramic Dielectric Filter with absorbing resonant cavity | |
| CN203039051U (en) | Microstrip low-pass filter | |
| CN209357890U (en) | A kind of filter and communication radio frequency device | |
| CN103413997A (en) | Vertical interdigital LTCC band-pass filter | |
| CN103986438A (en) | Laminated plate type filter | |
| CN103779640B (en) | Micro-band double-passband filter | |
| CN103972622A (en) | Cavity filter and communication radio frequency device | |
| CN101950832A (en) | Filter | |
| CN201689958U (en) | Microwave filter | |
| CN202737068U (en) | Passive cavity dot frequency band-stop filter | |
| CN202050042U (en) | Filter | |
| CN210142704U (en) | Filter and multi-zero implementation module thereof | |
| CN208637613U (en) | The antenna system and mobile terminal of mobile terminal | |
| CN201947547U (en) | Printed circuit board (PCB) for radio-frequency circuit | |
| CN214505743U (en) | PCB microstrip filter | |
| CN110137665A (en) | Integrated antenna array and base station | |
| CN204968238U (en) | Based on PCB wiring board circuit and PCB wiring board | |
| CN203617409U (en) | Broadband dielectric filter | |
| CN202308241U (en) | High-pass filter with transmission zero | |
| CN101714683B (en) | Dielectric filter with trap graphs and duplexer | |
| CN209267540U (en) | A kind of small-sized cured ultra wide band high-pass filter | |
| CN204067535U (en) | A kind of LTCC filtering Ba Lun adopting two-way inverse filtering circuit | |
| CN207338591U (en) | A kind of one wave filter of the C-band ultra wide band LC types six directions | |
| CN203760614U (en) | Ultra-wideband dual-band combiner | |
| CN201549572U (en) | Medium filter and duplexer with notch pattern |
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 |
Granted publication date: 20150520 Termination date: 20160107 |