CN202940313U - Band-pass filter formed by low-pass filters - Google Patents
Band-pass filter formed by low-pass filters Download PDFInfo
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- CN202940313U CN202940313U CN 201220652318 CN201220652318U CN202940313U CN 202940313 U CN202940313 U CN 202940313U CN 201220652318 CN201220652318 CN 201220652318 CN 201220652318 U CN201220652318 U CN 201220652318U CN 202940313 U CN202940313 U CN 202940313U
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Abstract
The utility model relates to a band-pass filter formed by low-pass filters. The band-pass filter comprises a circulator provided with an input port, an output port and a reflection port, wherein the input port and the reflection port are connected with two low-pass filters respectively, and each of the two low-pass filters is connected in series with a load. The cutoff frequency of the low-pass filter connected with the input port is the same with a higher shear frequency of the corresponding band-pass filter; the cutoff frequency of the low-pass filter connected with the reflection port is the same with a lower shear frequency of the corresponding band-pass filter; and the working bandwidth of the circulator contains the bandwidth of the corresponding band-pass filter. The band-pass filter formed by low-pass filters has the advantages that the band-pass filter is easy to implement, the designed technology is convenient and easy to implement, the cost can be saved, and the band-pass filter has excellent return loss characteristic.
Description
Technical field:
The utility model relates to the radio-frequency filter in wireless communication field, the band stop filter that especially a kind of low pass filter and circulator form.
Background technology:
In the application such as system testing in wireless communication RF field, often need to use band pass filter.Under actual conditions, often low pass filter and high pass filter are combined into band pass filter, compare low pass filter, kind and the quantity of high pass filter are fewer.If utilize method and apparatus described in the utility model, just can only build needed band pass filter with low pass filter easily, and not need high pass filter.
The utility model content:
The utility model is to overcome above-mentioned band pass filter in the deficiency of practical application, a kind of band pass filter that is formed by low pass filter and circulator is provided, solved band pass filter kind and negligible amounts and awkward problem, flexibility is good, and filter capacity is strong.
The utility model solves the technical scheme that its technical problem adopts: this band pass filter that is formed by low pass filter, comprise circulator 4, this circulator 4 has input port 1, output port 3 and reflector port 2, wherein be connected with low pass filter 5 on input port 1, be connected with low pass filter 6 on reflector port 2, low pass filter 5 is in series with load 7, and low pass filter 6 is in series with load 8.
The cut-off frequency f of low pass filter 5
1The higher shearing frequency f of respective band pass filters
h, the cut-off frequency f of low pass filter 6
2The lower shearing frequency f of respective band pass filters
1
The bandwidth of operation of circulator is contained the passband of respective band pass filters.
The beneficial effects of the utility model are:
1) because various low pass filters and circulator all use extensively in practice, design is used also relatively more ripe, uses band pass filters of low pass filter and high pass filter structure more simple and easy to do so band pass filter of the present utility model is compared other.
2) each low pass filter and the microwave circulators of the utility model design both can consist of together band pass filter and use, and also can break afterwards in use and be reduced into original device, used flexibly, saved cost.
3) band pass filter of the present utility model is compared with general band pass filter, has good return loss characteristic.
Description of drawings:
Fig. 1 is the structural representation of a kind of band pass filter that is formed by low pass filter of the present utility model.
Fig. 2 is the principle schematic of a kind of band pass filter that is formed by low pass filter of the present utility model.
Description of reference numerals: input port 1, reflector port 2, output port 3, circulator 4, low pass filter 5, low pass filter 6, load 7, load 8.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1 and Figure 2, this band pass filter that is formed by low pass filter, comprise circulator 4, this circulator 4 has input port 1, reflector port 2 and output port 3, wherein input port 1 is connected with low pass filter 5, be in series with 50 ohm load 7 on this low pass filter, reflector port 2 is connected with low pass filter 6, is in series with 50 ohm load 8 on this low pass filter.The bandwidth of operation of circulator 4 is contained the passband of corresponding band pass filter.The cut-off frequency f of low pass filter 5
1The higher shearing frequency f of respective band pass filters
h, the cut-off frequency f of low pass filter 6
2The lower shearing frequency f of respective band pass filters
1
Claims (3)
1. band pass filter that is formed by low pass filter, it is characterized in that, comprise circulator (4), this circulator (4) has input port (1), reflector port (2), output port (3), wherein respectively be connected with low pass filter on input port and reflector port, respectively be in series with load on two low pass filters.
2. the band pass filter that is formed by low pass filter according to claim 1, is characterized in that, the cut-off frequency f of described low pass filter (5)
1The higher shearing frequency f of respective band pass filters
h, the cut-off frequency f of low pass filter (6)
2The lower shearing frequency f of respective band pass filters
1
3. the band pass filter that is formed by low pass filter according to claim 1, is characterized in that, the bandwidth of operation of described circulator (4) is contained the passband of described band pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220652318 CN202940313U (en) | 2012-11-29 | 2012-11-29 | Band-pass filter formed by low-pass filters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220652318 CN202940313U (en) | 2012-11-29 | 2012-11-29 | Band-pass filter formed by low-pass filters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202940313U true CN202940313U (en) | 2013-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220652318 Expired - Fee Related CN202940313U (en) | 2012-11-29 | 2012-11-29 | Band-pass filter formed by low-pass filters |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202940313U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103000973A (en) * | 2012-11-29 | 2013-03-27 | 余姚亿威电子科技有限公司 | Band-pass filter formed by low pass filters |
| CN106410339A (en) * | 2016-10-08 | 2017-02-15 | 谢鹏浩 | High isolation multi-channel signal selection circulator network |
-
2012
- 2012-11-29 CN CN 201220652318 patent/CN202940313U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103000973A (en) * | 2012-11-29 | 2013-03-27 | 余姚亿威电子科技有限公司 | Band-pass filter formed by low pass filters |
| CN106410339A (en) * | 2016-10-08 | 2017-02-15 | 谢鹏浩 | High isolation multi-channel signal selection circulator network |
| CN106410339B (en) * | 2016-10-08 | 2019-03-05 | 谢鹏浩 | A kind of high-isolation multi-path signal behavior circulator network |
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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 |
Granted publication date: 20130515 Termination date: 20151129 |