CN201509200U - Directional coupler and signal detection system - Google Patents
Directional coupler and signal detection system Download PDFInfo
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- CN201509200U CN201509200U CN2009201332066U CN200920133206U CN201509200U CN 201509200 U CN201509200 U CN 201509200U CN 2009201332066 U CN2009201332066 U CN 2009201332066U CN 200920133206 U CN200920133206 U CN 200920133206U CN 201509200 U CN201509200 U CN 201509200U
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- directional coupler
- auxiliary line
- coupled
- detection system
- signal detection
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- 230000008878 coupling Effects 0.000 claims abstract description 22
- 238000010168 coupling process Methods 0.000 claims abstract description 22
- 238000005859 coupling reaction Methods 0.000 claims abstract description 22
- 238000002955 isolation Methods 0.000 claims description 20
- 238000004891 communication Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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Abstract
The utility model is applicable to communication field and provides a directional coupler and a signal detection system. The directional coupler comprises a main coupling line and an auxiliary coupling line, the main coupling line comprises a RF signal input end and a RF signal straight through end, the auxiliary coupling line comprises a coupling end and an isolating end, the auxiliary coupling line at least comprises two auxiliary coupling line coupling segments, and each segment of the auxiliary coupling line is connected with a matched impedance. The utility model realizes excellent directionality in broadband or multiple frequency range and overcomes the frequency band bottleneck problem in prior art; directional coupler and the signal detection system have simple implementation, realizes implementation without changing the main line design based on current main and auxiliary lines, also have good stability and consistency.
Description
Technical field
The utility model belongs to the communications field, relates in particular to a kind of directional coupler and signal detection system.
Background technology
At present, directional coupler is widely used in every field such as communication, network as a kind of general radio frequency device; Its directivity index is to weigh the key index of device performance.Along with the fast development of present Chinese 3G, application has proposed new requirement in that wideband, many nets, multifrequency be shared etc. to this device.
See also Fig. 1, existing directional coupler mostly is four port devices that adopt major and minor circuit single-stage coupling, main line connects the two ends, radio-frequency channel respectively, by adding a matched impedance in the auxiliary line isolated port, realize the high directivity of coupled end, this method often presents the narrow-band characteristic (seeing also Fig. 2) of directivity owing to the Frequency Response of coupled modes and matched impedance device, is not easy to realize broadband, multiband application.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of directional coupler and signal detection system of realizing good directivity on wideband or multiband.
For solving the problems of the technologies described above, the utility model provides a kind of directional coupler, the main line and the auxiliary line that comprise coupling, described main line comprises radio-frequency (RF) signal input end and the straight-through end of radiofrequency signal, described auxiliary line comprises coupled end and isolation end, described auxiliary line comprises two sections auxiliary line coupled section at least, and every section described auxiliary line coupled section all connects a matched impedance.
Described matched impedance is adjustable resistance, inductance or electric capacity.
Described matched impedance is arranged on described isolation end.
Described main line and described auxiliary line are by microstrip coupled.
The utility model also provides a kind of signal detection system, comprise directional coupler, described directional coupler comprises the main line and the auxiliary line of coupling, described main line comprises radio-frequency (RF) signal input end and the straight-through end of radiofrequency signal, described auxiliary line comprises coupled end and isolation end, described auxiliary line comprises two sections auxiliary line coupled section at least, and every section described auxiliary line coupled section all connects a matched impedance.
In the utility model, by a plurality of matched impedances are set at isolation end, thereby on wideband or multiband, realize good directivity, overcome the frequency band bottleneck problem of prior art; The utlity model has and implement simple advantage, on existing major and minor line construction basis, it is promptly practicable to need not to change the main line design, its good stability, and consistency is good.
Description of drawings
Fig. 1 is the structural representation of the directional coupler that provides of prior art.
Fig. 2 is the directivity Parameter Map that the microstrip coupled mode of employing single-stage that prior art provides obtains.
Fig. 3 is the structural representation of the directional coupler that provides of the utility model.
Fig. 4 is the directivity Parameter Map on bandwidth that the utility model provides.
Fig. 5 be the utility model provide in the directivity Parameter Map of striding on the frequency band.
Embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also Fig. 3, the directional coupler that provides for the utility model embodiment, described directional coupler comprises: the main line of coupling and auxiliary line, main line comprises radio-frequency (RF) signal input end and the straight-through end of radiofrequency signal, auxiliary line comprises coupled end and isolation end, described auxiliary line comprises two sections auxiliary line coupled section at least, and every section described auxiliary line coupled section all connects a matched impedance.In the present embodiment, described matched impedance can be adjustable resistance, inductance or electric capacity etc.; Described matched impedance is arranged on described isolation end; Described main line and described auxiliary line can be by microstrip coupled.When power when radio-frequency (RF) signal input end is imported, part signal is directly from the straight-through end output of radiofrequency signal, some signal is coupled in the auxiliary line, utilize the field vector stack of each partial wave, make the radiofrequency signal coupled end form coupling port, and radiofrequency signal isolation end field vector is oppositely offset the formation isolated port.
The degree of coupling is defined as the ratio of input incident power and coupled end power, and isolation is defined as the ratio of straight-through end incident power and coupled end power.Directivity is defined as the ratio of the degree of coupling and isolation.Usually directivity, the degree of coupling and isolation are represented with dB (decibel) that have this moment: directivity (the dB)=degree of coupling (dB)-isolation (dB).
In application, the matched impedance that is positioned at isolation end by adjusting makes coupled end in wideband section more or stride frequency range and reach the high directivity index.
See also Fig. 4, be the directivity Parameter Map on bandwidth, high directivity as can be seen from Figure.Fig. 5 is in the directivity Parameter Map of striding on the frequency band, as can be seen from Figure high directivity.
In concrete the application, can adopt two grade coupled cascade systems according to different directivity index requests, promptly two matched impedances are set and are parallel on the auxiliary line at isolation end; Perhaps, can adopt multistage coupling cascade system, promptly a plurality of matched impedances are set and are parallel on the auxiliary line, obtain better multiband directivity index at isolation end.
In the utility model embodiment, coupled modes also are not restricted to microstrip coupled.
The signal detection system that the utility model embodiment provides, described signal detection system comprises directional coupler, described directional coupler is used for the power of detection signal, described directional coupler comprises: the main line of coupling and auxiliary line, main line comprises radio-frequency (RF) signal input end and the straight-through end of radiofrequency signal, auxiliary line comprises coupled end and isolation end, and described auxiliary line comprises two sections auxiliary line coupled section at least, and every section described auxiliary line coupled section all connects a matched impedance.
As from the foregoing, the utility model embodiment is by being provided with a plurality of matched impedances at isolation end, thereby realizes good directivity on wideband or multiband, overcome the frequency band bottleneck problem of prior art; The utlity model has and implement simple advantage, on existing major and minor line construction basis, it is promptly practicable to need not to change the main line design, its good stability, and consistency is good.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1. directional coupler, the main line and the auxiliary line that comprise coupling, it is characterized in that, described main line comprises radio-frequency (RF) signal input end and the straight-through end of radiofrequency signal, described auxiliary line comprises coupled end and isolation end, described auxiliary line comprises two sections auxiliary line coupled section at least, and every section described auxiliary line coupled section all connects a matched impedance.
2. directional coupler as claimed in claim 1 is characterized in that, described matched impedance is adjustable resistance, inductance or electric capacity.
3. directional coupler as claimed in claim 1 is characterized in that described matched impedance is arranged on described isolation end.
4. directional coupler as claimed in claim 1 is characterized in that, described main line and described auxiliary line are by microstrip coupled.
5. signal detection system, comprise directional coupler, it is characterized in that, described directional coupler comprises the main line and the auxiliary line of coupling, described main line comprises radio-frequency (RF) signal input end and the straight-through end of radiofrequency signal, described auxiliary line comprises coupled end and isolation end, and described auxiliary line comprises two sections auxiliary line coupled section at least, and every section described auxiliary line coupled section all connects a matched impedance.
6. signal detection system as claimed in claim 5 is characterized in that, described matched impedance is adjustable resistance, inductance or electric capacity.
7. signal detection system as claimed in claim 5 is characterized in that described matched impedance is arranged on described isolation end.
8. signal detection system as claimed in claim 5 is characterized in that, described main line and described auxiliary line are by microstrip coupled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201332066U CN201509200U (en) | 2009-06-22 | 2009-06-22 | Directional coupler and signal detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201332066U CN201509200U (en) | 2009-06-22 | 2009-06-22 | Directional coupler and signal detection system |
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| CN201509200U true CN201509200U (en) | 2010-06-16 |
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| CN2009201332066U Expired - Fee Related CN201509200U (en) | 2009-06-22 | 2009-06-22 | Directional coupler and signal detection system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103201899A (en) * | 2010-11-12 | 2013-07-10 | 株式会社村田制作所 | Directional coupler |
| CN104617368A (en) * | 2014-07-22 | 2015-05-13 | 络达科技股份有限公司 | Broadband directional coupler |
| CN105826645A (en) * | 2015-01-27 | 2016-08-03 | Tdk株式会社 | Directional coupler |
| CN106374942A (en) * | 2015-07-20 | 2017-02-01 | 英飞凌科技股份有限公司 | System and method for a directional coupler |
| CN106410357A (en) * | 2015-07-29 | 2017-02-15 | Tdk株式会社 | Directional coupler |
| CN106450641A (en) * | 2015-08-07 | 2017-02-22 | Tdk株式会社 | Directional coupler |
| CN106464279A (en) * | 2014-04-18 | 2017-02-22 | 天工方案公司 | Independent multi-band tuning |
-
2009
- 2009-06-22 CN CN2009201332066U patent/CN201509200U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103201899A (en) * | 2010-11-12 | 2013-07-10 | 株式会社村田制作所 | Directional coupler |
| US8803633B2 (en) | 2010-11-12 | 2014-08-12 | Murata Manufacturing Co., Ltd. | Directional coupler |
| CN103201899B (en) * | 2010-11-12 | 2015-01-21 | 株式会社村田制作所 | Directional coupler |
| CN106464279A (en) * | 2014-04-18 | 2017-02-22 | 天工方案公司 | Independent multi-band tuning |
| CN104617368A (en) * | 2014-07-22 | 2015-05-13 | 络达科技股份有限公司 | Broadband directional coupler |
| CN105826645A (en) * | 2015-01-27 | 2016-08-03 | Tdk株式会社 | Directional coupler |
| CN105826645B (en) * | 2015-01-27 | 2019-08-20 | Tdk株式会社 | Directional coupler |
| CN106374942A (en) * | 2015-07-20 | 2017-02-01 | 英飞凌科技股份有限公司 | System and method for a directional coupler |
| CN106374942B (en) * | 2015-07-20 | 2019-07-12 | 英飞凌科技股份有限公司 | System and method for directional coupler |
| CN106410357A (en) * | 2015-07-29 | 2017-02-15 | Tdk株式会社 | Directional coupler |
| CN106410357B (en) * | 2015-07-29 | 2020-09-18 | Tdk株式会社 | Directional coupler |
| CN106450641A (en) * | 2015-08-07 | 2017-02-22 | Tdk株式会社 | Directional coupler |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100616 Termination date: 20180622 |