CN1776957A - Band-stop filter formed from band-pass filter - Google Patents
Band-stop filter formed from band-pass filter Download PDFInfo
- Publication number
- CN1776957A CN1776957A CN 200510061734 CN200510061734A CN1776957A CN 1776957 A CN1776957 A CN 1776957A CN 200510061734 CN200510061734 CN 200510061734 CN 200510061734 A CN200510061734 A CN 200510061734A CN 1776957 A CN1776957 A CN 1776957A
- Authority
- CN
- China
- Prior art keywords
- band
- pass filter
- filter
- band pass
- port
- 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.)
- Pending
Links
Images
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Being formed from band-pass filter, the band elimination filter includes ring unit of possessing input port, output port and reflection port. The band-pass filter with load being cascaded is connected to the reflection port. Passband of the band-pass filter is identical to stopband of corresponding band elimination filter. Working bandwidth of the ring unit covers passband of band-pass filter. Useful effects of the invention are: (1) easy of implementation; (2) mature designing technique, saving cost, flexible multiple use; (3) comparing with general band elimination filter, the invented filter keeps fine characteristic of return loss in each stop band when same signal of stop band is restrained.
Description
Technical field
The present invention relates to radio frequency and cavity filter in the wireless communication field, especially a kind of band stop filter that forms by band pass filter.
Background technology
In the application such as system testing in wireless communication RF field, usually need to use various band stop filters.But actual conditions are, it is conventional part that various band pass filters are widely used, and mostly just contain in tested radio system, and corresponding various band stop filters, and but owing to only be used for test, quantity and kind are less than corresponding various band pass filters far away more.When often needing to use band stop filter, just need the special processing customization of ancillary cost financial resource and material resource and time.If utilize the method for the invention and device, just can constitute required various band stop filters with conventional various band pass filters quickly and easily, laborsaving the getting twice the result with half the effort of saving money.
Summary of the invention
The present invention will solve the shortcoming of above-mentioned prior art, and a kind of band stop filter that is formed by band pass filter that only utilizes that a small amount of conventional common radio-frequency devices constitutes is provided, and is economical laborsaving.
The present invention solves the technical scheme that its technical problem adopts: this band stop filter that is formed by band pass filter, comprise circulator, this circulator has input port, output port and reflector port, wherein is connected with band pass filter on the reflector port, is in series with load on this band pass filter.
The present invention can be further perfect by following manner: band pass filter has at least two, is connected with reflector port after each band pass filter parallel connection, is in series with load on each band pass filter.
The passband of band pass filter and the stopband of corresponding band stop filter are identical.
The bandwidth of operation of circulator is contained the passband of described band pass filter.
The effect that the present invention is useful is: 1) because various band pass filters and respective annular device all belong to widely used conventional device, so the device that the present invention relates to is realized easily; 2) because the design of band pass filter application is more extensive than corresponding design of band-stop filter application, so the more ripe easy row of the designing technique that the present invention relates to; 3) various band pass filters that the present invention relates to and respective annular device both can constitute band stop filter together and use, and also can break after use and be reduced into original various band pass filters and respective annular device, and it is flexible multi-purpose to save cost; 4) the various band stop filters that the present invention relates to, same suppress the stopband signal in, compare with general band stop filter, in each stopband, still have good return loss characteristic, be particularly useful for containing the test of the radio system of standing-wave ratio alarm.In sum, this method and apparatus that band pass filter is become band stop filter has more practical value.
Description of drawings
Fig. 1 is the embodiment of the invention 1 structural representation;
Fig. 2 is the embodiment of the invention 1 principle schematic;
Fig. 3 is the embodiment of the invention 2 structural representations;
Fig. 4 is the embodiment of the invention 2 principle schematic.
Description of reference numerals: input port 1, reflector port 2, output port 3, circulator 4, band pass filter 5, load 6.
Embodiment
The invention will be further described below in conjunction with accompanying drawing:
Embodiment 1: as shown in Figure 1 and Figure 2, this band stop filter that is formed by band pass filter comprises circulator 4, and this circulator 4 has input port 1, output port 3 and reflector port 2, wherein be connected with band pass filter 5 on the reflector port 2, be in series with 50 Ω loads 6 on this band pass filter 5.The passband of band pass filter 5 and the stopband of corresponding band stop filter are identical.The bandwidth of operation of circulator 4 is contained the passband of described band pass filter 5.
Embodiment 2: as shown in Figure 3, Figure 4, band pass filter 5 has two, and two band pass filters, 5 backs in parallel are connected with reflector port 2, are in series with 50 Ω loads 6 on each band pass filter 5.
In the signal by 1 input of circulator input port, the frequency component of band pass filter passband is absorbed by 50 Ω loads 6 by described band pass filter 5 transmission backs; In the signal by 1 input of circulator input port, frequency component outside the passband is after circulator reflector port 2 is reflected, by output port 3 outputs, the feasible attenuation characteristic that has realized corresponding band stop filter by circulator input port 1 to the signal of circulator output port 3.
Adopt the present invention, can just can constitute required various band stop filters with conventional various band pass filters and corresponding broad-band circulator.
Claims (4)
1, a kind of band stop filter that forms by band pass filter, comprise circulator (4), it is characterized in that: this circulator (4) has input port (1), output port (3) and reflector port (2), wherein be connected with band pass filter (5) on the reflector port (2), be in series with load (6) on this band pass filter (5).
2, the band stop filter that forms by band pass filter according to claim 1, it is characterized in that: described band pass filter (5) has at least two, each band pass filter (5) back in parallel is connected with reflector port (2), is in series with load (6) on each band pass filter (5).
3, the band stop filter that is formed by band pass filter according to claim 1 and 2 is characterized in that: the stopband of the passband of described band pass filter (5) and corresponding band stop filter (5) is identical.
4, the band stop filter that is formed by band pass filter according to claim 1 and 2 is characterized in that: the bandwidth of operation of described circulator (4) is contained the passband of described band pass filter (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510061734 CN1776957A (en) | 2005-11-28 | 2005-11-28 | Band-stop filter formed from band-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510061734 CN1776957A (en) | 2005-11-28 | 2005-11-28 | Band-stop filter formed from band-pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1776957A true CN1776957A (en) | 2006-05-24 |
Family
ID=36766329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510061734 Pending CN1776957A (en) | 2005-11-28 | 2005-11-28 | Band-stop filter formed from band-pass filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1776957A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329198B (en) * | 2007-06-20 | 2010-06-02 | 中国计量科学研究院 | Method for measuring light device echo loss |
| 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 |
| EP2733781A1 (en) * | 2012-11-16 | 2014-05-21 | Alcatel-Lucent | A filter assembly and a method of filtering |
| EP2768073A1 (en) * | 2013-02-14 | 2014-08-20 | Alcatel Lucent | A method of filtering and a filter assembly |
| CN108292910A (en) * | 2015-12-08 | 2018-07-17 | 华为技术有限公司 | Tunable bandpass filters |
-
2005
- 2005-11-28 CN CN 200510061734 patent/CN1776957A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329198B (en) * | 2007-06-20 | 2010-06-02 | 中国计量科学研究院 | Method for measuring light device echo loss |
| EP2733781A1 (en) * | 2012-11-16 | 2014-05-21 | Alcatel-Lucent | A filter assembly and a method of filtering |
| WO2014075760A1 (en) * | 2012-11-16 | 2014-05-22 | Alcatel Lucent | A filter assembly and a method of filtering |
| CN104756311A (en) * | 2012-11-16 | 2015-07-01 | 阿尔卡特朗讯 | A filter assembly and a method of filtering |
| US9887688B2 (en) | 2012-11-16 | 2018-02-06 | Provenance Asset Group Llc | Filter assembly and a method of filtering |
| 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 |
| EP2768073A1 (en) * | 2013-02-14 | 2014-08-20 | Alcatel Lucent | A method of filtering and a filter assembly |
| CN108292910A (en) * | 2015-12-08 | 2018-07-17 | 华为技术有限公司 | Tunable bandpass filters |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1776957A (en) | Band-stop filter formed from band-pass filter | |
| US7277403B2 (en) | Duplexer with a differential receiver port implemented using acoustic resonator elements | |
| CN101950827A (en) | Branch node loaded ultra wideband microwave filter | |
| CN101257288A (en) | Finite impulse response digit filter capable of configuring parameter | |
| CN112002979B (en) | Filtering power divider and communication system | |
| CN109713411A (en) | A kind of micro-strip double-frequency broadband filter | |
| CN207039549U (en) | The directional coupler system of the high Coupling flatness of broadband | |
| CN109217836B (en) | Four-port low-reflection duplex filter | |
| CN2867618Y (en) | Band-stop filter formed by band-pass filter | |
| CN109786905B (en) | Strip line low pass filter | |
| CN103956545A (en) | Microwave four-frequency band pass filter | |
| CN110676543A (en) | External loading type low-pass and band-stop microwave transmission line filter of coupling line with reconfigurable transmission response | |
| CN101217210B (en) | A three frequency band filter based on parallel coupled line structure | |
| CN102751960A (en) | Radio frequency low pass filter applied to long term evolution (LTE) | |
| CN202940313U (en) | Band-pass filter formed by low-pass filters | |
| CN206271847U (en) | A kind of radio communication Wide stop bands open stub Microstrip Low-Pass | |
| CN103000973B (en) | A kind of bandpass filter being formed by low pass filter | |
| CN208753482U (en) | A kind of cavity bandstop filter that performance is stable | |
| CN109819299A (en) | A kind of high-pass filtering circuit and high-pass filter | |
| CN107689782A (en) | A kind of wave filter for suppressing second harmonic | |
| CN110707401A (en) | Coupling line loading low-pass or band-stop filter with reconfigurable transmission response | |
| CN207460112U (en) | LC low-pass filters | |
| CN110071351A (en) | A kind of tunable band bandpass filter based on across coupling line | |
| CN100583549C (en) | Filter | |
| CN209913005U (en) | Five-way combiner and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |