CN115441140A - Filter coupler - Google Patents
Filter coupler Download PDFInfo
- Publication number
- CN115441140A CN115441140A CN202211367210.5A CN202211367210A CN115441140A CN 115441140 A CN115441140 A CN 115441140A CN 202211367210 A CN202211367210 A CN 202211367210A CN 115441140 A CN115441140 A CN 115441140A
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- Prior art keywords
- coupler
- open
- filter
- base
- strip line
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a filter coupler, comprising: base, low pass filter and directional coupler, wherein: the low-pass filter is arranged in the base and comprises a plurality of sections of high-impedance lines and a plurality of sections of open-circuit branches, the high-impedance lines are connected in series and then connected with the input end of the coupler, the open-circuit branches are connected with the high-impedance lines in parallel, and grooves for filling gas media are arranged around the high-impedance lines; the directional coupler is arranged in the base and comprises a main coupling strip line, one end of the main coupling strip line is connected with a high-impedance line in the low-pass filter, and the other end of the main coupling strip line is connected with the output end of the coupler. By adopting the technical scheme, the power capacity can be improved, the size can be reduced, the processing and assembling difficulty can be reduced, the phase speed of the odd die and the even die can be balanced, and the directivity can be improved.
Description
Technical Field
The invention relates to the technical field of signal transmission, in particular to a filter coupler.
Background
The high-power filter coupler is an important component of a high-power TR component (T/R represents Transmitter and Receiver, and the T/R component is a part between a medium frequency and an antenna of a wireless transceiving system in a general sense), wherein the low-pass filter realizes higher harmonic suppression and meets the requirement of electromagnetic compatibility, and the high-directivity directional coupler monitors output power and reflected power and realizes self-protection of the component.
In the prior art, the implementation forms of the high-power low-pass filter are generally divided into a lumped parameter low-pass filter and a distributed parameter low-pass filter. The high-power lumped-parameter low-pass filter is generally used at a lower broadcast transmitting frequency, the higher the frequency is, the insertion loss and the power capacity are reduced, and the power requirement of kilowatt is difficult to meet; the distributed parameter low-pass filter comprises transmission forms such as a coaxial form, a micro-strip form and a strip line form, the coaxial form has higher processing precision requirement, large volume and is difficult to debug, the micro-strip form has large insertion loss, and the power capacity is difficult to improve. In addition, because the phase velocities of the odd mode and the even mode of the non-uniform coupling strip line of the internal medium are not equal, the directivity is reduced, and the situation is more serious in the weak coupling.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a filtering coupler, aiming at adopting a gas medium as filling in a high-impedance line part based on a low-pass filter, improving power capacity, reducing size and reducing processing and assembling difficulty; furthermore, the open-circuit branch of the low-pass filter adopts a high-molecular polymer medium as a support, so that the impedance is improved, the line width is reduced, and the size is reduced; furthermore, a groove used for filling gas and a short-circuit branch knot are arranged at the part of the parallel coupling strip line, so that the phase velocity of an odd mode and an even mode is balanced, and the directivity is improved.
The technical scheme is as follows: the invention provides a filter coupler, comprising: base, low pass filter and directional coupler, wherein: the low-pass filter is arranged in the base and comprises a plurality of sections of high-impedance lines and a plurality of sections of open-circuit branches, the high-impedance lines are connected in series and then connected with the input end of the coupler, the open-circuit branches are connected with the high-impedance lines in parallel, and grooves used for filling gas media are arranged around the high-impedance lines; the directional coupler is arranged in the base and comprises a main coupling strip line, one end of the main coupling strip line is connected with a high-impedance line in the low-pass filter, and the other end of the main coupling strip line is connected with the output end of the coupler.
Specifically, the open-circuit branches are arranged on two sides of the high-impedance line, and every two open-circuit branches on different sides are connected to one point.
Specifically, the open-circuit branch is supported by a high molecular polymer medium.
Specifically, the low-pass filter includes 4 high-impedance lines.
Specifically, the low-pass filter includes 6 open branches.
Specifically, the directional coupler further includes an auxiliary coupling strip line, and the auxiliary coupling strip line is arranged in parallel with the main coupling strip line.
Specifically, a plurality of open-circuit branches are arranged on one side of the auxiliary coupling strip line, and the length range of the open-circuit branches arranged on one side of the auxiliary coupling strip line is 0.3mm to 0.7mm.
Specifically, notches are arranged on the base in the areas of the main coupling strip line and the auxiliary coupling strip line.
Specifically, the base combines by long avris and short avris and forms the L type, and the low pass filter sets up in one side, and directional coupler sets up the opposite side at the base, and the high impedance line among the low pass filter sets up in the juncture of long avris and short avris.
The device comprises a base, and is characterized by further comprising an upper cover plate, wherein the upper cover plate is matched with the base, and high polymer media are filled in the upper cover plate and the base to serve as supports.
Has the beneficial effects that: compared with the prior art, the invention has the following remarkable advantages: the power capacity is improved, the size is reduced, the processing and assembling difficulty is reduced, the phase speed of an odd die and an even die is balanced, and the directivity is improved.
Drawings
Fig. 1 is a schematic structural diagram of a filter coupler according to the present invention;
FIG. 2 is a schematic structural diagram of a filter coupler filled with a polytetrafluoroethylene medium in the prior art;
fig. 3 is a schematic structural diagram of an upper cover plate of the filter coupler provided in the present invention;
FIG. 4 illustrates the transmission and reflection S parameters of the filter coupler provided by the present invention;
FIG. 5 is a graph showing the coupling and directivity of a filter coupler without the addition of short open stubs and air slots;
FIG. 6 shows the coupling degree and directivity of the filter coupler provided by the present invention;
1-a base; 2-high impedance line; 3-open circuit branch knot; 4-a groove; 5-a high molecular weight polymer medium; 6-coupled strip lines; 7-short open circuit branch knot; 8-notch; 9-upper cover plate.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Fig. 1 is a schematic structural diagram of a filter coupler according to the present invention.
The invention provides a filter coupler, comprising: base 1, low pass filter and directional coupler, wherein: the low-pass filter is arranged in the base 1 and comprises a plurality of sections of high-impedance lines 2 and a plurality of sections of open-circuit branches 3, the high-impedance lines 2 are connected in series and then connected with the input end of the coupler, the open-circuit branches 3 are connected with the high-impedance lines 2 in parallel, and grooves 4 for filling gas media (which can be air) are arranged around the high-impedance lines 2; the directional coupler is arranged in the base 1 and comprises a main coupling strip line, one end of the main coupling strip line is connected with the high-impedance line 2 in the low-pass filter, and the other end of the main coupling strip line is connected with the output end of the coupler.
In the specific implementation, referring to fig. 2, regarding the part of the high impedance line 2, in the prior art, a high polymer medium 5 (typically, a teflon medium) is usually filled in the base 1 to serve as a support for the high impedance line 2, but if the target impedance is the same, and when the teflon is filled, the strip line (the high impedance line 2) will be thin, which will cause great difficulty in integrally processing the inner conductor, and the thin inner conductor causes the power capacity to be limited, whereas in the present invention, an air medium is filled around the high impedance line 2, the width of the high impedance line 2 is similar to 50 Ω at the port, which reduces discontinuity, abrupt change and processing difficulty, and also increases the power capacity.
In the embodiment, the series high impedance line 2 of the present invention is 110 Ω.
In the embodiment of the invention, the open-circuit branches are arranged at two sides of the high-impedance line 2, and every two open-circuit branches 3 at different sides are connected to one point.
In the specific implementation, the open-circuit branch is low in impedance and is selected to be 40 omega.
In a specific embodiment, the open-circuit branch is connected in parallel with the high-impedance line 2, one open-circuit branch on one side of the high-impedance line 2 is connected to a point corresponding to one open-circuit branch on the other side of the high-impedance line 2, the open-circuit branch 3 is of low impedance, and in order to reduce the line width of the open-circuit branch to reduce the size, a mode that low-impedance lines are connected in parallel on both sides of the high-impedance line 2 is used.
In the embodiment of the present invention, the low-pass filter includes 4 sections of high impedance lines 2.
In the embodiment of the invention, the low-pass filter comprises 6 open branches 3, 3 branches are arranged on one side of the high- impedance line 2, and 3 branches are arranged on the other side of the high-impedance line.
In a specific implementation, the 4 segments of the high-impedance line 2 are equivalent to an inductor, and every two segments of the 6 open-circuit branches 3 are connected to one point, so that the 4 segments of the high-impedance line can be equivalent to 3 open-circuit branches, and the open-circuit branches are equivalent to a capacitor.
In the embodiment of the invention, the open-circuit branches 3 are supported by a high molecular polymer medium 5.
In the specific implementation, in order to improve the impedance and reduce the line width, and solve the problems of the support and the size of the central conductor (the coupling strip line 6) of the directional coupler, a polytetrafluoroethylene medium is filled in the base 1 to be used as the support of the open-circuit branch 3 part.
In the embodiment of the invention, the directional coupler further comprises an auxiliary coupling strip line, and the auxiliary coupling strip line and the main coupling strip line are arranged in parallel.
In the embodiment of the invention, a plurality of short and open branches 7 are arranged on one side of the secondary coupling strip line, and the length of the short and open branches 7 arranged on one side of the secondary coupling strip line ranges from 0.3mm to 0.7mm, preferably, the length is 0.5mm.
In the embodiment of the present invention, in the areas of the main coupling strip line and the sub-coupling strip line, the base 1 is provided with the notch 8 (air slot), and the opening of the notch 8 may correspond to the portions of the main coupling strip line and the sub-coupling strip line at the same time, that is, the opening of the notch 8 may cross the main coupling strip line and the sub-coupling strip line, and meanwhile, the upper cover plate 9 is also provided with the corresponding notch 8.
In the specific implementation, two coupling strip lines are arranged in parallel, a plurality of short-open branch sections connected in parallel are arranged on the auxiliary coupling strip line, meanwhile, the area part of the coupling strip line is arranged on the clamping plate (namely the base 1 and/or the upper cover plate 9), and the groove 4 is arranged on the clamping plate, so that the coupling degree and the directivity can be remarkably improved, and particularly the directivity of the L-band is remarkably improved.
In the embodiment of the invention, the base 1 is formed into an L shape by combining a long side and a short side, the low-pass filter is arranged on one side, the directional coupler is arranged on the other side of the base 1, and the high-impedance line 2 in the low-pass filter is arranged at the junction of the long side and the short side.
Referring to fig. 3, in the embodiment of the present invention, the filter coupler further includes an upper cover plate 9, the upper cover plate 9 is adapted to the base 1, and the upper cover plate 9 and the base 1 are internally filled with a high molecular polymer medium 5 for supporting.
In the specific implementation, the upper cover plate 9 and the base 1 form a clamping plate of a strip line, the polytetrafluoroethylene medium upper support and the polytetrafluoroethylene lower support form an inner medium of the strip line, and the upper cover plate 9 and the base 1 can be correspondingly provided with notches 8 in the areas of the main coupling strip line and the auxiliary coupling strip line, and grooves 4 for filling gas media are arranged around the high-impedance lines 2.
Referring to fig. 4, which is the transmission and reflection S parameters of the filter coupler provided by the present invention, it can be seen that the insertion loss in the pass band is 0.1dB, and the rejection at the second harmonic is above 44 dB. The return loss in the entire passband is below-26 dB.
Referring to fig. 5 and 6, it can be seen from the drawings that, the prior art twin-line parallel coupler has no measures, the coupling degree and the directivity result are shown in fig. 5, the solid line is the coupling degree, the dotted line is the isolation degree, the coupling degree in the pass band is-29.8 dB, the directivity is about 20dB, the open-circuit branch is added on the coupling strip line, and the air notch 8 is arranged on the clamping plate, so that the phase velocity difference of the odd mode and the even mode can be better balanced, the directivity is improved, the coupling degree and the directivity result are shown in fig. 6, the coupling degree in the pass band is-29.5 dB, the directivity reaches 31dB, and the directivity is greatly improved.
The measured data of the filter coupler provided by the invention is shown in the following table:
in specific implementation, the filter coupler provided by the invention improves the power capacity, realizes smaller size and higher out-of-band rejection, the rejection at the second harmonic reaches more than 45dBc, the filter coupler can bear 3000W peak power, the average power exceeds 500W, and the directivity reaches more than 25dB under the weak coupling condition.
Claims (10)
1. A filter coupler, comprising: base, low pass filter and directional coupler, wherein:
the low-pass filter is arranged in the base and comprises a plurality of sections of high-impedance lines and a plurality of sections of open-circuit branches, the high-impedance lines are connected in series and then connected with the input end of the coupler, the open-circuit branches are connected with the high-impedance lines in parallel, and grooves for filling gas media are arranged around the high-impedance lines;
the directional coupler is arranged in the base and comprises a main coupling strip line, one end of the main coupling strip line is connected with a high-impedance line in the low-pass filter, and the other end of the main coupling strip line is connected with the output end of the coupler.
2. The filter-coupler according to claim 1, wherein the open-circuit branches are disposed on both sides of the high-impedance line, and each two open-circuit branches on different sides are connected to one point.
3. The filter-coupler according to claim 2, wherein the open stub is supported by a high-molecular polymer medium.
4. The filtering coupler according to claim 2, wherein the low-pass filter comprises 4 high-impedance lines.
5. The filtering coupler of claim 2, wherein said low pass filter comprises 6 open stubs.
6. The filter coupler of claim 1, wherein the directional coupler further comprises a secondary coupling strip line, the secondary coupling strip line being disposed parallel to the primary coupling strip line.
7. The filter-coupler according to claim 6, wherein a plurality of open-circuit stubs are provided at one side of the secondary coupling strip line, and the length of the open-circuit stubs provided at one side of the secondary coupling strip line is in a range of 0.3mm to 0.7mm.
8. The filter coupler of claim 6, wherein notches are provided in the base in the region of the primary and secondary coupling strip lines.
9. The filter-coupler according to claim 1, wherein the base is formed in an L-shape by combining a long side and a short side, the low-pass filter is disposed at one side, the directional coupler is disposed at the other side of the base, and the high-impedance line of the low-pass filter is disposed at a boundary between the long side and the short side.
10. The filter coupler of claim 1, further comprising an upper cover plate, wherein the upper cover plate is adapted to the base, and a polymer medium is filled in the upper cover plate and the base to serve as a support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211367210.5A CN115441140B (en) | 2022-11-03 | 2022-11-03 | Filtering coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211367210.5A CN115441140B (en) | 2022-11-03 | 2022-11-03 | Filtering coupler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115441140A true CN115441140A (en) | 2022-12-06 |
| CN115441140B CN115441140B (en) | 2023-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211367210.5A Active CN115441140B (en) | 2022-11-03 | 2022-11-03 | Filtering coupler |
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| Country | Link |
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| CN (1) | CN115441140B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116111313A (en) * | 2023-04-04 | 2023-05-12 | 安徽蓝讯通信科技有限公司 | Broadband directional coupler and design method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201134494Y (en) * | 2007-12-27 | 2008-10-15 | 奥雷通光通讯设备（上海）有限公司 | Strong coupling device with defect structure |
| KR20090011227U (en) * | 2008-04-29 | 2009-11-03 | (주)에이스안테나 | Hybrid Connector using Coupler Scheme |
| CN110994095A (en) * | 2019-12-11 | 2020-04-10 | 京信通信技术(广州)有限公司 | Low pass filter, millimeter wave AAU system and communication device |
| WO2022019722A1 (en) * | 2020-07-23 | 2022-01-27 | 삼성전자 주식회사 | Antenna filter and electronic device including same in wireless communication system |
| CN216362153U (en) * | 2021-09-26 | 2022-04-22 | 合肥海特微波科技有限公司 | Deformation type sheet type high-low impedance line low-pass filter |
-
2022
- 2022-11-03 CN CN202211367210.5A patent/CN115441140B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201134494Y (en) * | 2007-12-27 | 2008-10-15 | 奥雷通光通讯设备（上海）有限公司 | Strong coupling device with defect structure |
| KR20090011227U (en) * | 2008-04-29 | 2009-11-03 | (주)에이스안테나 | Hybrid Connector using Coupler Scheme |
| CN110994095A (en) * | 2019-12-11 | 2020-04-10 | 京信通信技术(广州)有限公司 | Low pass filter, millimeter wave AAU system and communication device |
| WO2022019722A1 (en) * | 2020-07-23 | 2022-01-27 | 삼성전자 주식회사 | Antenna filter and electronic device including same in wireless communication system |
| CN216362153U (en) * | 2021-09-26 | 2022-04-22 | 合肥海特微波科技有限公司 | Deformation type sheet type high-low impedance line low-pass filter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116111313A (en) * | 2023-04-04 | 2023-05-12 | 安徽蓝讯通信科技有限公司 | Broadband directional coupler and design method thereof |
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| Publication number | Publication date |
|---|---|
| CN115441140B (en) | 2023-05-12 |
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