CN201256175Y - Dual capacitor loading band-pass filter - Google Patents
Dual capacitor loading band-pass filter Download PDFInfo
- Publication number
- CN201256175Y CN201256175Y CNU200820190126XU CN200820190126U CN201256175Y CN 201256175 Y CN201256175 Y CN 201256175Y CN U200820190126X U CNU200820190126X U CN U200820190126XU CN 200820190126 U CN200820190126 U CN 200820190126U CN 201256175 Y CN201256175 Y CN 201256175Y
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- resonant
- capacitive load
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- cover plate
- rod
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Abstract
The utility model relates to a dual-capacity loading bandpass filter, which comprises a resonant cavity body, a cover plate, a resonant bar and a capacity loading plate, and is characterized in that the capacity loading plate is arranged between the resonant cavity body and the cover plate, via holes are arranged on a position of the capacity loading plate, which corresponds to the resonant bar, the resonant bar passes through the via holes and does not contact with the capacity loading plate, a turning side of the upper end of the resonant bar is located between the capacity loading plate and the cover plate, and gaps are respectively arranged between the capacity loading plate and the cover plate. The dual-capacity loading bandpass filter adds the capacity loading plate to increase capacity based on a traditional filter, thereby achieving the purpose of reducing frequency. Compared with the traditional design, the processing difficulty of products is greatly reduced, the stability of the products is strong, because the dual-capacity loading bandpass filter has no especial demands for the resonant cavity body, the method of die casting can be directly used to produce when batch production, and the production cost is lower.
Description
Technical field
The utility model relates to the microwave communication field, relates in particular to a kind of pair of capacitive load band pass filter.
Background technology
Existing band pass filter (duplexer) is a passive device, and the signal of the frequency beyond the passband is decayed, and guarantees that the frequency signal in the passband passes through with the loss of minimum.Because the band pass filter product requirement volume that has is little, frequency is low.Method for designing according to traditional single capacitor loading, under the situation that guarantees small product size, want the frequency that reaches required, the volume of resonant rod and resonant rod upper end must reduce with the distance of cover plate, improved the machining accuracy and the difficulty of resonant rod like this, therefore the power capacity of product also can reduce greatly.This drawback is particularly outstanding in the lower product of frequency.Be easy to process and reach required frequency and can improve power capacity if guarantee resonant rod, then need to strengthen single cavity volume, it is inadvisable obviously to strengthen single cavity volume, and the volume of product will strengthen and can not meet the demands like this.
The utility model content
The purpose of this utility model is in order to solve the deficiency that the above-mentioned background technology exists, and proposes a kind of constantly in small product size, under the situation that resonant rod is easy to process, can reduce frequency effectively and reach the two capacitive load band pass filters that improve the product power capacity greatly.
The utility model adopts following technical scheme for achieving the above object: two capacitive load band pass filters, this filter comprises resonant cavity, cover plate, resonant rod, capacitive load plate composition, it is characterized in that between described resonant cavity and cover plate, being provided with a capacitive load plate, on the capacitive load plate, be provided with through hole with the resonant rod corresponding position, resonant rod passes this through hole, do not contact with the capacitive load plate, the flange of resonant rod upper end and leaves the gap respectively and between capacitive load plate and the cover plate between capacitive load plate and cover plate.
On the cover board be provided with the adjusting screw(rod) coaxial with resonant rod with the resonant rod corresponding position, adjusting screw(rod) stretches in the hole of resonant rod central authorities, does not contact with resonant rod.
Described capacitive load plate is positioned on the upper surface of resonant cavity, cover plate, capacitive load plate resonant cavity body and function screw together, resonant rod is screwed on resonant cavity inner surface face.
The utility model is the principle design that adopts distributed constant, a capacitive load plate especially is set between resonant cavity and cover plate carries out two capacitive load to reach the requirement that reduces frequency, realize the band pass filter that a kind of renewal is more excellent, with respect to traditional design, the utility model difficulty of processing reduces greatly, and the stability of product strengthens, because resonant cavity is not had special requirement, can directly adopt pressure casting method production during batch process, production cost is lower.
Description of drawings
Fig. 1 is the stereogram of capacitive load plate structure.
Fig. 2 is the main diagrammatic sketch of resonant cavity structure.
Fig. 3 is the stereogram of covering plate structure.
Fig. 4 is that the capacitive load plate is fixed on the resonant cavity structural perspective.
Fig. 5 is that cover plate is fixed on resonant cavity structure cutaway view.
The two loading capacitance schematic diagrames of Fig. 6.
Embodiment
Specifically implement referring to figs. 1 through Fig. 5.Present embodiment mainly is made up of critical pieces such as resonant cavity 1, cover plate 2, resonant rod 3, capacitive load plate 4 and adjusting screw(rod)s 5, wherein, a capacitive load plate 4 is set between described resonant cavity 1 and cover plate 2, described capacitive load plate 4 is to be made by conductive metallic material, it is positioned on the upper surface of resonant cavity 1, can be made as one by resonant cavity body 1, also can separate by resonant cavity body 1.The capacitive load plate 4 resonant cavity bodies 1 of present embodiment separate, and described cover plate 2, capacitive load plate 4 resonant cavity bodies 1 are screwed together, and resonant rod 3 is screwed on resonant cavity 1 inner surface face.Be provided with through hole 6 with resonant rod 3 corresponding positions on capacitive load plate 4, resonant rod 3 passes this through hole 6, does not contact with capacitive load plate 4.The flange 7 of resonant rod 3 upper ends and leaves the gap respectively and between capacitive load plate 4 and the cover plate 2 between capacitive load plate 4 and cover plate 2.Adjusting screw(rod) 5 usefulness nuts 8 fixing on the cover board with the resonant rod corresponding position, adjusting screw(rod) 5 is coaxial with resonant rod 3, adjusting screw(rod) 5 stretches in the hole of resonant rod 3 central authorities, does not contact with resonant rod 3.
Referring to Fig. 6, the flange 7 of resonant rod described in the utility model 3 upper ends constitutes loading capacitance C1 with cover plate 2, constitutes capacitor C 2 with capacitive load plate 4, thereby realizes that two capacitive load reach the purpose of frequency reducing.In the gap of capacitor C 1 and C2,, can also fill media such as pottery, polyethylene except that filling the air dielectric.
Claims (3)
1, two capacitive load band pass filters, this filter comprises resonant cavity, cover plate, resonant rod, capacitive load plate composition, it is characterized in that between described resonant cavity and cover plate, being provided with a capacitive load plate, on the capacitive load plate, be provided with through hole with the resonant rod corresponding position, resonant rod passes this through hole, do not contact with the capacitive load plate, the flange of resonant rod upper end and leaves the gap respectively and between capacitive load plate and the cover plate between capacitive load plate and cover plate.
2, according to claim 1 pair of capacitive load band pass filter is characterized in that on the cover board being provided with the adjusting screw(rod) coaxial with resonant rod with the resonant rod corresponding position, and adjusting screw(rod) stretches in the hole of resonant rod central authorities, does not contact with resonant rod.
3, according to claim 1 or described pair of capacitive load band pass filter, it is characterized in that described capacitive load plate is positioned on the upper surface of resonant cavity, cover plate, capacitive load plate resonant cavity body and function screw together, resonant rod is screwed on resonant cavity inner surface face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820190126XU CN201256175Y (en) | 2008-08-07 | 2008-08-07 | Dual capacitor loading band-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820190126XU CN201256175Y (en) | 2008-08-07 | 2008-08-07 | Dual capacitor loading band-pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201256175Y true CN201256175Y (en) | 2009-06-10 |
Family
ID=40739503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820190126XU Expired - Lifetime CN201256175Y (en) | 2008-08-07 | 2008-08-07 | Dual capacitor loading band-pass filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201256175Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950832A (en) * | 2010-10-29 | 2011-01-19 | 昆山锦泰电子器材有限公司 | Filter |
| CN102354780A (en) * | 2011-07-22 | 2012-02-15 | 深圳市大富科技股份有限公司 | Cavity filter and communication device |
| CN107707212A (en) * | 2017-08-21 | 2018-02-16 | 南京理工大学 | UHF waveband and SHF wave band staircase resonant impedance capacitance loaded type duplexers |
| CN107978828A (en) * | 2017-11-17 | 2018-05-01 | 江苏亚信电子科技有限公司 | A kind of low intermodulation, the base station anti-interference band bandpass filter of high power DCS frequency ranges |
-
2008
- 2008-08-07 CN CNU200820190126XU patent/CN201256175Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950832A (en) * | 2010-10-29 | 2011-01-19 | 昆山锦泰电子器材有限公司 | Filter |
| CN102354780A (en) * | 2011-07-22 | 2012-02-15 | 深圳市大富科技股份有限公司 | Cavity filter and communication device |
| CN107707212A (en) * | 2017-08-21 | 2018-02-16 | 南京理工大学 | UHF waveband and SHF wave band staircase resonant impedance capacitance loaded type duplexers |
| CN107978828A (en) * | 2017-11-17 | 2018-05-01 | 江苏亚信电子科技有限公司 | A kind of low intermodulation, the base station anti-interference band bandpass filter of high power DCS frequency ranges |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090610 |
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| CX01 | Expiry of patent term |