CN116722336A - Filtering power divider based on copper-based micro-coaxial transmission line - Google Patents
Filtering power divider based on copper-based micro-coaxial transmission line Download PDFInfo
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- CN116722336A CN116722336A CN202211436442.1A CN202211436442A CN116722336A CN 116722336 A CN116722336 A CN 116722336A CN 202211436442 A CN202211436442 A CN 202211436442A CN 116722336 A CN116722336 A CN 116722336A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 90
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 75
- 239000010949 copper Substances 0.000 title claims abstract description 75
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000001914 filtration Methods 0.000 title claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 37
- 229910052751 metal Inorganic materials 0.000 claims abstract description 37
- 230000007704 transition Effects 0.000 claims abstract description 29
- 238000010168 coupling process Methods 0.000 claims description 13
- 238000005859 coupling reaction Methods 0.000 claims description 13
- 230000008878 coupling Effects 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 12
- 238000002955 isolation Methods 0.000 claims description 10
- 230000000737 periodic effect Effects 0.000 claims description 3
- 239000004020 conductor Substances 0.000 abstract description 18
- 238000013461 design Methods 0.000 abstract description 9
- 230000010354 integration Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920002120 photoresistant polymer Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
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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
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/085—Coaxial-line/strip-line transitions
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Abstract
The invention discloses a filtering power divider based on a copper-based micro-coaxial transmission line, and relates to the technical fields of ultra-wideband radar, electronic reconnaissance, countermeasure and the like. The copper-based micro-coaxial transmission line-microstrip line transition structure is applied to an input/output port of the power divider, and good transition of the two structures is realized through a micro-coaxial gradual change structure; the copper-based micro-coaxial transmission line consists of a conductor inner core, a metal outer wall and a dielectric support bar, and the characteristic impedance of the transmission line is changed by changing the width and the thickness of the inner core; the transition structure, filter and power divider are based on copper-based micro-coaxial transmission line designs. Compared with the traditional microwave circuit, the invention has the advantages of small size, high system integration level and low interconnection loss, and has good prospect in the technical fields of ultra-wideband radar, electronic reconnaissance, countermeasure and the like.
Description
Technical Field
The invention relates to the technical fields of ultra-wideband radar, electronic reconnaissance, countermeasure and the like and particularly relates to a filtering power divider based on a copper-based micro-coaxial transmission line.
Background
With the development of microwave communication technology and the lack of spectrum resources, both civil and military communication systems, the development of higher frequency bands is gradually advanced. However, the copper-based micro coaxial transmission line is a novel transmission line with low loss, high isolation and low dispersion because the loss of the traditional printed circuit in the microwave frequency band is high. The transmission line has a quasi-planar structure, is easy to miniaturize and integrate, and can be interconnected with other transmission lines. The ultra-wideband technology has wide application in a plurality of fields such as communication, electronic countermeasure, electronic reconnaissance, military radar, navigation and the like due to the good anti-interference performance, strong confidentiality and the like. Correspondingly, the millimeter wave ultra-wideband filter, the power divider and the like are key devices, and the ultra-wideband microwave passive device with low transmission loss can be designed by utilizing the low-loss characteristic of the copper-based micro-coaxial transmission line.
In conventional microwave transceiver systems, power splitters and filters are often used together. However, these two devices are generally designed separately and connected by a 50 ohm transmission line, which causes problems such as large circuit size and interconnection loss. In recent years, a learner proposes a thought of combining a filter and a power divider, namely, a filtering power divider, so as to save circuit area and improve device performance.
Disclosure of Invention
The invention aims to design a power divider which is based on a copper-based micro coaxial transmission line and is implanted with a filtering function, wherein the power divider improves the circuit integration level, reduces the circuit design size and has good transmission performance.
In order to achieve the above object, the present invention provides the following technical solutions: a copper-based micro-coaxial transmission line-based filtering power divider comprising:
copper-based micro-coaxial transmission line-microstrip line transition structure;
the filter based on the branch loading multimode resonator is loaded at two equal division output ends of the broadband Wilkinson power divider, and equal division signals are filtered and output;
the broadband Wilkinson power divider based on the LC network comprises an input end and two output ends, wherein the input end is directly connected with a copper-based micro-coaxial transmission line-microstrip line transition structure to form an input port of the filtering power divider, and the output end is connected with the copper-based micro-coaxial transmission line-microstrip line transition structure through a filtering branch to form a first output port and a second output port of the filtering power divider.
Preferably, the copper-based micro coaxial transmission line-microstrip line transition structure is surface-mounted on a dielectric substrate, and the dielectric substrate is provided with a grounding metal via hole array.
Preferably, the copper-based micro-coaxial transmission line is provided with release holes and medium supporting bars which are arranged periodically.
Preferably, the filter is composed of two short circuit branches, two sections of coupled lines and a section of high-impedance ratio open line.
Preferably, the short circuit branch, the two sections of coupling lines and the opening line are transmission lines with quarter wavelength, the coupling line structure of the filter is composed of a metal outer wall and two parallel adjacent inner cores, the side wall of the metal outer wall is windowed and is provided with periodically arranged supporting columns for supporting, and the two inner cores are supported by periodically arranged medium supporting bars.
Preferably, the short circuit branch and the open line in the filter are respectively realized by connecting and separating an inner core of the copper-based micro-coaxial transmission line with the metal outer wall, and the metal outer wall of the terminal of the short circuit branch is not provided with a release hole.
Preferably, the copper-based micro-coaxial transmission line metal outer wall, the inner core and the copper-based micro-coaxial transmission line-microstrip line transition structure are axisymmetric structures, and the filter and the broadband wilkinson power divider are both symmetric structures.
Preferably, the broadband wilkinson power divider is composed of two sections of quarter-wavelength transmission lines, isolation resistors and isolation RLC circuit branches.
Compared with the prior art, the invention has the following beneficial effects:
1. the power divider based on the copper-based micro coaxial transmission line and implanted with the filtering function is designed and manufactured integrally with the filter, so that the device has the functions of power distribution and filtering. At the same time, the design reduces the size of the circuit, which is beneficial to realizing high integration of the microwave circuit.
2. The copper-based micro-coaxial transmission line has the advantages of low loss, high isolation, self-packaging and the like, and the branch loading multimode resonator and the LC network-based power divider designed according to the technology have good transmission characteristics.
3. The designed copper-based micro coaxial transmission line-microstrip line transition structure realizes the interconnection of the traditional microwave circuit and the novel transmission structure, and greatly expands the collaborative design of different technologies.
Drawings
FIG. 1 is a block diagram of an embodiment of the present invention;
FIG. 2 is an exploded view of an embodiment of the present invention on a dielectric substrate;
FIG. 3 is a top view of an embodiment of the present invention;
fig. 4 is a schematic structural view of a conductor core;
FIG. 5 is a schematic diagram of a transition structure and simulation results thereof according to an embodiment of the present invention;
fig. 6 and fig. 7 are simulation results of an embodiment of the present invention.
Reference numerals: 1-input port, 2-first output port, 1, 3-second output port, 2, 11-metal outer wall, 12-conductor inner core, 13-release hole, 14-medium support bar, 15-medium substrate, 16-copper-based micro coaxial transmission line-microstrip line transition structure, 17-grounding metal via hole array, 18-coupling line, 19-short circuit branch, 20-open line, 21-0402 packaging resistance pad, 22-0402 packaging capacitance pad, 23-filter, 24-broadband Wilkinson power divider.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts fall within the protection scope of the present invention.
For understanding and description, the following describes in detail a filtering power divider based on a copper-based micro-coaxial transmission line provided by the embodiment of the invention.
Referring to fig. 1-7, the 6-18GHz power divider based on a copper-based micro-coaxial transmission line and implanted with a filtering function provided by the present invention includes a dielectric substrate 15, a copper-based micro-coaxial transmission line-microstrip line transition structure 16, a copper-based micro-coaxial transmission line, a filter 23 based on a branch-node loading multimode resonator, and a broadband wilkinson power divider 24 based on an LC network. The copper-based micro-coaxial line-microstrip line transition structure 16 is surface-mounted on the dielectric substrate 15 with the metal grounding via array 17.
Wherein the copper-based micro-coaxial transmission line comprises a metal outer wall 11, a conductor inner core 12 and a dielectric strip 14 for supporting the inner core, and the cavity between the metal outer wall 11 and the inner core 12 is filled with air, so that the transmission loss is greatly reduced; the copper-based micro-coaxial transmission line-microstrip line transition structure 16 consists of a metal sheet, a metal outer wall 11 and a conductor inner core 12; the two sections of coupling lines 18, the one section of high-impedance ratio open line 20 and the two short-circuit branches 19 connected with the input/output ports of the filter based on the branch loading multimode resonator are designed based on copper-based micro-coaxial transmission lines; the quarter-wavelength transmission line, the inductance L and the copper-based micro-coaxial transmission line design of the broadband Wilkinson power divider 24 based on an LC network are also based on the structure, and an 0402 packaging element is adopted for the isolation resistor and the isolation capacitor; the filter power divider comprises three ports, namely an input port 1, a first output port 2 and a second output port 3, and the impedance of the three ports is matched to a 50 ohm microstrip line. The wideband wilkinson power divider 24 based on LC network includes an input end and two output ends, the input end is directly connected with the copper-based micro-coaxial transmission line-microstrip line transition structure 16 to form the input port 1 of the filtering power divider, the output end is connected with the copper-based micro-coaxial transmission line-microstrip line transition structure 16 through the filtering branches to form the output ports 2 and 3 of the filtering power divider, and the metal outer wall 11, the inner core 12 and the copper-based micro-coaxial transmission line-microstrip line transition structure 16 of the copper-based micro-coaxial transmission line are axisymmetric structures. The filter 23 based on the stub-loaded multimode resonator and the broadband wilkinson power divider 24 based on the LC network are both symmetrical structures.
When the device is used, radio frequency signals are input from the input port 1, firstly, a power distribution structure divides one path of radio frequency signals into two paths of signals with equal amplitude and the like, and a filtering resonance structure selectively passes the radio frequency signals. Based on a 3D copper-based micro-coaxial transmission line structure, the filtering structure and the Wilkinson power dividing structure are integrally designed, so that the device has the filtering function and the power dividing function, the size of the device can be reduced, the miniaturization is realized, meanwhile, good performance is maintained, and the miniaturization and the integration of a radio frequency communication system are facilitated. The designed copper-based micro-coaxial transmission line-microstrip line transition structure 16 is more convenient to cooperatively design with the traditional process; in addition, the lumped element is designed by the process, so that the circuit size is greatly reduced, and interference caused by introducing other forms of capacitance and inductance is also reduced.
The copper-based micro-coaxial metal outer wall 11, the conductor inner core 12 and the copper-based micro-coaxial transmission line-microstrip line transition structure 16 are symmetrical structures.
The copper-based micro-coaxial transmission line-microstrip line transition structure 16 is a widening gradual-change structure, and the metal outer wall 11 and the conductor inner core 12 are widened synchronously.
The characteristic impedance of the quarter-wavelength transmission line of the broadband Wilkinson power divider based on the LC network is determined by the width and thickness of the copper-based micro coaxial transmission line conductor inner core, and the thickness is 60um, 100um and 260 um; the lumped element inductances are all designed based on copper-based micro-coaxial technology; the isolation resistors and capacitors are designed with corresponding pads 21,22 according to the size standard, and the pads are positioned on the conductor inner core.
The filter based on the branch loading multimode resonator is respectively connected with the two output ports 2 and 3 of the Wilkinson power divider, so that the collaborative design of the multimode resonator and the power divider is realized.
The short-circuit branches 19, the two coupled lines 18 and the high-impedance-ratio open line 20 of the filter are all quarter-wavelength transmission lines, the center frequency of which is 12GHz.
More specifically, the short circuit branch of the filter is formed by connecting a copper-based micro-coaxial metal outer wall 11 with a conductor inner core 12; the coupling line is formed by two adjacent inner cores 12 in the metal outer wall 11 of the copper-based micro-coaxial transmission line, the coupling coefficient is determined by the distance between the inner core conductors 12 and the metal outer wall 11, and the side wall of the metal outer wall is windowed to obviously enhance the coupling strength of the coupling line; the open line comprises two sections of quarter-wavelength transmission lines with different characteristic impedance, so that the resonance mode is increased, and the transmission bandwidth is widened.
The copper-based micro-coaxial transmission line has a periodic arrangement of release holes 13 and dielectric support strips 14.
More specifically, the metal outer wall 11 has periodic release holes 13, the conductor core is wrapped in the metal outer wall 11, and the conductor core is supported by periodically arranged dielectric strips 14 passing through the conductor core.
The short circuit branch 19 and the open circuit line 20 in the filter 23 based on the branch loading multimode resonator are respectively realized by connecting and separating the copper-based micro coaxial transmission line inner core 12 and the metal outer wall 11, and the metal outer wall of the terminal of the short circuit branch 19 is not provided with a release hole 13 in order to ensure good grounding.
The basic structure of this embodiment is a copper-based micro-coaxial transmission line, which is processed using electrochemical additive technology. The rectangular micro-coaxial line manufacturing process based on the research institute has 9 layers, and each layer has a thickness of 60-100 um. It should be noted that although circular coaxial lines have lower losses than rectangular coaxial lines, air-filled circular coaxial lines are not easily processed, and rectangular coaxial lines are more suitable for such a layer-by-layer sequential processing manufacturing process.
The copper-based micro-coaxial transmission line has the height of only 860um, can be regarded as a quasi-planar structure, and transmits electromagnetic waves which are TEM waves, and has extremely low loss. And release holes which are periodically arranged are needed to be added in the processing process of the copper-based micro-coaxial transmission line so as to release photoresist used in the manufacturing process. The number of the release holes 13 is not too large or too small, electromagnetic leakage is caused by too large, incomplete photoresist removal is caused by too small, residues are caused, the quality and the transmission performance of the transmission line are affected, and the characteristic impedance of the copper-based micro-coaxial transmission line is determined by the width and the thickness of the conductor inner core.
The coupling line 18 portion of the multimode resonator-based filter, the metal outer wall 11 side wall of which needs to be windowed, is loaded based on the dendrites, thereby enhancing coupling. It should be noted that the support columns that are periodically arranged cannot be too many or too few, the coupling strength is reduced due to the too many support columns, and the stability and the firmness of the structure are affected due to the too few support columns, so that the use of the whole device is affected.
More specifically, the copper-based micro-coaxial transmission line conductor core 12 coincides with and remains parallel to the metal outer wall axis 11. The copper-based micro-coaxial transmission line is supported by periodically arranged dielectric strips 14, the dielectric support strips 14 penetrate through the conductor inner core, and two ends of the dielectric support strips are embedded in the metal outer wall 11. In addition, the dielectric support bars 14 should be periodically arranged at appropriate intervals, and too dense arrangement can cause too high electromagnetic loss, too sparse arrangement can cause insufficient support to the conductor core 12, and influence the structure and strength of the device.
In order to make the whole structure more compact and miniaturized, the embodiment of the invention bends the short-circuit line 19 and the open-circuit line 20, and reduces the whole size of the broadband filtering power divider on the premise of ensuring the transmission effect as much as possible.
After the copper-based micro-coaxial portion is processed, the entire structure needs to be attached to the processed dielectric substrate. The bottom surface of the metal outer wall 11 of the copper-based micro-coaxial part and the upper surface of the dielectric substrate 15 are on the same horizontal plane, then metal sheets are extended to the two ends of the dielectric substrate at the position of the copper-based micro-coaxial transmission line-microstrip line transition structure 16, and the manufacturing of the 6-18GHz copper-based micro-coaxial transmission line filter implantation power divider with the microstrip transition structure is completed. The metal material used in the design of this embodiment is copper, and the dielectric substrate material is Rogers 5880.
As shown in fig. 5, 6 and 7, the characteristics of the implanted power divider of the 6-18GHz copper-based micro-coaxial transmission line filter with the microstrip transition structure are simulated. Simulation results show that the return loss of the transition structure is better than 30dB in the range of 6-18 GH; the ultra-wideband filtering power divider has a center frequency of 11.95GHz, a 3dB working bandwidth of 11.90GHz, a working frequency covering 6.0-17.9GHz, a minimum insertion loss in a passband of 0.4665dB, a return loss of better than 14.5dB in the range of 6.2-17.9GHz, an isolation of better than 16.99dB in the passband, and a majority of areas in the passband of better than 20dB.
The above embodiments are merely preferred embodiments of the present invention, the protection scope of the present invention is not limited thereto, and any simple changes or equivalent substitutions of technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention disclosed in the present invention belong to the protection scope of the present invention.
Claims (8)
1. A filtering power divider based on copper-based micro-coaxial transmission lines, comprising:
a copper-based micro-coaxial transmission line-microstrip transition structure (16);
a filter (23) based on branch loading multimode resonator is loaded at two equal division output ends of the broadband Wilkinson power divider (24), and equal division signals are filtered and output;
the broadband Wilkinson power divider (24) based on the LC network comprises an input end and two output ends, wherein the input end is directly connected with a copper-based micro-coaxial transmission line-microstrip line transition structure (16) to form an input port (1) of the filter power divider, and the output ends are connected with the copper-based micro-coaxial transmission line-microstrip line transition structure (16) through a filter branch to form a first output port (2) and a second output port (3) of the filter power divider.
2. A filtering power divider based on copper-based micro coaxial transmission line according to claim 1, characterized in that the copper-based micro coaxial transmission line-microstrip line transition structure (16) is surface-mounted on a dielectric substrate (15), and the dielectric substrate (15) is provided with a grounded metal via array (17).
3. A filtering power divider based on a copper-based micro-coaxial transmission line according to claim 1, characterized in that the copper-based micro-coaxial transmission line has a periodic arrangement of release holes (13) and dielectric support strips (14).
4. A filtering power divider based on copper-based micro coaxial transmission lines according to claim 3, characterized in that the filter (23) consists of two short-circuit branches (19), two sections of coupled lines (18), a section of high-impedance-ratio open line (20).
5. The filtering power divider based on the copper-based micro-coaxial transmission line according to claim 4, wherein the short circuit branch (19), the two sections of coupling lines (18) and the open line (20) are all quarter-wavelength transmission lines, the coupling line (18) structure of the filter is composed of a metal outer wall (11) and two parallel adjacent inner cores (12), the side wall of the metal outer wall (11) is windowed, and the side wall of the metal outer wall is provided with periodically arranged supporting columns for supporting, and the two inner cores (12) are supported by periodically arranged medium supporting bars (14).
6. A filtering power divider based on copper-based micro-coaxial transmission line according to claim 5, wherein the short-circuit branch (19) and the open line (20) in the filter (23) are respectively realized by connecting and separating an inner core (12) of the copper-based micro-coaxial transmission line and a metal outer wall (11), and the metal outer wall of the terminal of the short-circuit branch (19) is not provided with a release hole (13).
7. A filtering power divider based on copper-based micro coaxial transmission line according to claim 6, characterized in that the metal outer wall (11), the inner core (12) and the copper-based micro coaxial transmission line-microstrip line transition structure (16) of the copper-based micro coaxial transmission line are all axisymmetric structures, and the filter (23) and the broadband wilkinson power divider (24) are both symmetric structures.
8. A filtering power divider based on copper-based micro-coaxial transmission line according to claim 1, characterized in that the broadband wilkinson power divider (24) consists of two quarter-wave transmission lines, isolation resistors and isolation RLC circuit branches.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211436442.1A CN116722336A (en) | 2022-11-16 | 2022-11-16 | Filtering power divider based on copper-based micro-coaxial transmission line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211436442.1A CN116722336A (en) | 2022-11-16 | 2022-11-16 | Filtering power divider based on copper-based micro-coaxial transmission line |
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