CN110416675B - High-low pass combiner - Google Patents
High-low pass combiner Download PDFInfo
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- CN110416675B CN110416675B CN201910707832.XA CN201910707832A CN110416675B CN 110416675 B CN110416675 B CN 110416675B CN 201910707832 A CN201910707832 A CN 201910707832A CN 110416675 B CN110416675 B CN 110416675B
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- 239000004020 conductor Substances 0.000 claims abstract description 177
- 238000001914 filtration Methods 0.000 claims abstract description 29
- 230000008878 coupling Effects 0.000 claims abstract description 12
- 238000010168 coupling process Methods 0.000 claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims description 89
- 239000003990 capacitor Substances 0.000 claims description 25
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 abstract description 7
- 230000000712 assembly Effects 0.000 abstract 1
- 238000000429 assembly Methods 0.000 abstract 1
- 230000000875 corresponding effect Effects 0.000 description 15
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 238000005192 partition Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000006880 cross-coupling reaction Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
- H01P1/2138—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using hollow waveguide filters
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Abstract
The invention provides a high-low pass combiner which comprises a cavity body provided with a cavity and a cover plate covered with the cavity body, wherein two ends of the cavity body are respectively provided with a connecting port, and a baffle plate for separating the cavity body into a high-pass filtering cavity and a low-pass filtering cavity is arranged in the cavity body; the high-pass filter cavity is internally provided with conductor assemblies, two ends of each conductor assembly are respectively and correspondingly electrically connected with the connecting ports at two ends of the cavity, each conductor assembly comprises a plurality of conductors, and the conductors are arranged along the longitudinal direction of the cavity and are sequentially and capacitively coupled; the low-pass filter cavity is internally provided with a strip line filter passage, and two ends of the strip line filter passage are respectively and correspondingly electrically connected with the input and output connection ports; at least a portion of the conductors extend toward the bottom wall of the cavity and form a support member secured to the wall. The high-low pass combiner is integrated with the high pass of the stripline low pass and the coaxial line coupling connection conductor structure, can be applied to a 5G high frequency band, and has the advantages of high Q value, large power capacity, wide passband, high isolation and the like.
Description
Technical Field
The invention relates to the field of mobile communication, in particular to a high-low pass combiner.
Background
The cavity filter and the cavity high-low pass combiner are widely used in the modern communication field, and have the basic functions of enabling useful signals to pass through a signal link to the maximum extent, suppressing useless signals to the maximum extent, and enabling the high-low pass combiner to be capable of splitting and combining signals in different frequency bands. With the rapid advancement of 5G technology, mobile communication systems are being developed toward higher frequencies in order to obtain greater channel capacity and higher transmission rates. In order to achieve coexistence with existing systems, high-low pass combiners are required to meet wider bandwidth requirements. Thus, in the course of the evolution of the mobile communication system, a high-low-pass combiner with high performance is naturally required.
The implementation mode of the high-low pass combiner in the prior art is mainly combining paths among the coaxial resonant cavity band-pass paths. The method has the advantages of high Q value and large power capacity, poles can be increased in a cross coupling mode, and the requirement of strong out-of-band rejection is met, but the method has the disadvantage that the prior combining technology cannot realize the bandwidth of more than 1.5GHz along with the increase of the bandwidth. Such a high-low-pass combiner cannot meet the requirements of high isolation, high power and pass bandwidth among mobile communication systems, and a better combining scheme must be found.
Disclosure of Invention
The invention aims to provide a high-low-pass combiner integrated with a high-pass path and a low-pass path, which is suitable for the development of 5G technology and has the advantages of high Q value, large power capacity, wide passband, high isolation and the like.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention relates to a high-low pass combiner, which comprises a cavity and a cover plate covered with the cavity, wherein a longitudinal cavity is arranged in the cavity, connection ports for input and output are respectively formed at two ends of the longitudinal direction of the cavity, a partition plate for separating the cavity into a high-pass filter cavity and a low-pass filter cavity is arranged in the cavity, and the partition plate extends along the longitudinal direction of the cavity;
the high-pass filter cavity is internally provided with a conductor assembly, two ends of which are respectively and correspondingly electrically connected with the input and output connecting ports, the conductor assembly comprises a plurality of conductors, and the conductors are arranged along the longitudinal direction of the cavity and are sequentially and capacitively coupled;
the low-pass filter cavity is internally provided with a strip line filter passage, and two ends of the strip line filter passage are respectively and correspondingly electrically connected with the input and output connection ports; at least a portion of the conductors extend toward the bottom wall of the cavity and form a support secured to the cavity.
Further set up: the support piece comprises a metal support rod, and one end of the metal support rod, far away from the conductor, is provided with a mounting hole for inserting and matching a fastener penetrating through the bottom wall of the cavity so as to be used for fixing the metal support rod and the cavity.
Further set up: the conductor comprises a first conductor and a second conductor, the supporting piece is arranged on the first conductor, a connecting hole is formed in one side, opposite to the second conductor, of the first conductor, the connecting hole and the second conductor are coaxially arranged, and two adjacent conductors are connected in a sleeved mode through the corresponding second conductors and the connecting holes in a coupling mode.
Further set up: the length of the second conductor inserted into the connection hole of its neighboring conductor is set to be inversely related to the cut-off frequency of the filter.
Further set up: a medium piece is arranged between two adjacent conductors, and comprises a medium sleeve inserted between the second conductor and the connecting hole and a medium sheet arranged at the end part of the medium sleeve and used for separating the first conductors of the adjacent conductors.
Further set up: the connecting port comprises a public port, a first connecting port and a second connecting port, wherein the public port is arranged at one of two ends of the cavity along the longitudinal direction of the cavity and is communicated with the high-pass filtering cavity and the low-pass filtering cavity, the first connecting port and the second connecting port are arranged at the other end of the cavity opposite to the public port, the first connecting port is connected with the high-pass filtering cavity, and the second connecting port is connected with the low-pass filtering cavity.
Further set up: the strip line filtering path comprises a first metal sheet and a second metal sheet;
the first metal sheet is positioned above the second metal sheet, a gap is formed between the first metal sheet and the second metal sheet, and the first metal sheet and the second metal sheet are fixed in the cavity through medium screws;
the first metal sheet is connected with the second connecting port;
the second metal sheet is connected with the common port, and comprises a middle part arranged along the longitudinal direction of the cavity and extension parts positioned at two sides of the middle part, and a gap is reserved between adjacent extension parts positioned at the same side of the middle part so as to form a groove of the second metal sheet.
Further set up: and a high-low impedance low-pass filter passage connected between the second connection port and the strip line filter passage is also arranged in the low-pass filter cavity.
Further set up: and a filter capacitor and a wire connected in series with the filter capacitor are further arranged on one side of the cavity, which is close to the public port, and the filter capacitor is respectively connected with the conductor component in the high-pass filter cavity and the strip line filter path in the low-pass filter cavity through wires.
Further set up: three wave traps are arranged in the cavity and are connected in one-to-one correspondence to the public port, the first connecting port and the second connecting port, and a connecting plate for enabling the three wave traps to be electrically connected with each other is arranged on the cover plate.
Compared with the prior art, the scheme of the invention has the following advantages:
1. in the high-low pass combiner, the high-pass filter passage is arranged in the high-pass filter cavity, the low-pass filter passage is arranged in the low-pass filter cavity, and therefore the high-pass filter passage and the low-pass filter passage can be integrated in the same cavity, the high-low pass combiner can achieve coexistence of a 5G technical system and an existing system, meanwhile, the low-pass filter passage adopts combination of the high-low impedance low-pass filter passage and the strip line filter passage, the high-pass filter passage adopts a plurality of conductors to be mutually sleeved and forms a series capacitor under isolation of a medium piece, meanwhile, a supporting piece for supporting the conductors is arranged between each conductor and the side wall of the cavity, the structure of the conductors in the cavity is more stable, the supporting piece is electrically connected with the conductors and the side wall of the cavity, the supporting piece can form parallel inductance of the high-pass filter, the high-pass filter can form a chebyshev filter, rectangular coefficient of the high-pass filter is small and is close to 1, a filter characteristic curve is steep, signals outside a frequency band are restrained out, the high-of-band signal can reach a high passband, and the high-pass combiner has a high bandwidth of 20MHz, and the high-pass combiner can be inserted into a high-band frequency band with a high-pass filter of a bandwidth of 20, and a high-pass band requirement is met.
2. In the high-low pass combiner, the strip line filtering combining circuit has a simple structure, and the high-pass filtering combining circuit adopts a plurality of conductors with the same structure to be mutually sleeved, so that the high-low pass combiner has good consistency, is easy to produce and process, and is suitable for batch production.
3. In the high-low pass combiner, three wave traps respectively corresponding to the public port, the first connection port and the second connection port are arranged in the cavity to be used for transmitting direct current control signals for controlling antenna parameters, and the high-low pass combiner is suitable for antennas and can adjust the parameters of the antennas.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a high-low pass combiner according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a high-pass filter path in the high-low pass combiner according to the present invention;
FIG. 3 is a split view of a high pass filter path structure in a high and low pass combiner according to the present invention;
FIG. 4 is a top plan view of one embodiment of a high-low pass combiner of the present invention;
fig. 5 is a cross-sectional view of a high-pass filtered path structure in a high-low pass combiner of the present invention.
In the figure, 11, cavity; 111. a high-pass filter cavity; 112. a low pass filter cavity; 12. a cover plate; 13. a partition plate; 21. a common port; 22. a first connection port; 23. a second connection port; 3. a high pass filtering path; 31. a conductor; 311. a first conductor; 312. a second conductor; 313. a connection hole; 32. a dielectric member; 321. a medium sleeve; 322. a media sheet; 33. a support; 331. a mounting hole; 34. a first connector; 341. a first connecting rod; 342. a second connecting rod; 35. a second connector; 351. connecting sleeves; 352. a third connecting rod; 4. a low pass filter path; 41. a high-low impedance low-pass filter path; 411. a high-low impedance low-pass conductor bar; 412. an annular medium sleeve; 42. a stripline filter path; 421. a first metal sheet; 422. a second metal sheet; 4221. an intermediate portion; 4222. an extension; 423. a first media sheet; 424. a second media sheet; 5. a filter capacitor; 51. a wire; 52. a dielectric pad; 61. a wave trap; 62. an inductance; 7. a tuning screw; 1000. a high-low pass combiner.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
Referring to fig. 1 to 5, the present invention relates to a high-low pass combiner 1000, which integrates a high-pass filter and a low-pass filter in the same cavity, can realize coexistence of a 5G technology and an existing system, and can simultaneously consider performance indexes such as insertion loss and volume, namely, the high-low pass combiner has the characteristics of small volume and light weight, can realize good performances such as small insertion loss, high isolation, high power and wide passband bandwidth, and has the advantages of small rectangular coefficient, good frequency selectivity, simple structure, and convenience for processing and mass production.
Referring to fig. 1, the high-low pass combiner 1000 includes a cavity 11 and a cover plate 12 covered with the cavity 11, the cover plate 12 is a metal cover plate, and the cover plate 12 and the cavity 11 are fastened by screws, so that a cavity (not labeled in the figure, the same applies below) for signal transmission is defined inside the cavity 11. Specifically, the cavity is a closed cavity that is elongated. Meanwhile, connection ports for input and output are respectively formed at two ends of the cavity 11 in the longitudinal direction of the cavity.
Further, a partition plate 13 is provided in the cavity 11, which extends in the longitudinal direction thereof and separates the cavity to form a high-pass filter cavity 111 and a low-pass filter cavity 112, the high-pass filter cavity 111 having the high-pass filter path 3 of the high-low pass combiner 1000 provided therein, and the low-pass filter cavity 112 having the low-pass filter path 4 of the high-low pass combiner 1000 provided therein, specifically, the low-pass filter path 4 including the strip line filter path 42.
The connection ports include a common port 21 electrically connected to both the high-pass filter path 3 and the low-pass filter path 4, a first connection port 22 electrically connected to the high-pass filter path 3, and a second connection port 23 electrically connected to the low-pass filter path 4. The common port 21 is disposed at one end of the cavity 11 along the longitudinal direction of the cavity, the first connection port 22 and the second connection port 23 are disposed at one end of the cavity 11 opposite to the common port 21, the first connection port 22 is disposed corresponding to the high-pass filter cavity 111, and the second connection port 23 is disposed corresponding to the low-pass filter cavity 112.
Referring to fig. 1 to 3, the high-pass filter 3 includes a conductor assembly (not labeled in the drawings, and the same applies below) with two ends respectively corresponding to the connection ports of the cavity for input and output, the conductor assembly includes a plurality of conductors 31 arranged along the longitudinal direction of the cavity and sequentially coupled to each other, and a plurality of conductors 31 sequentially arranged and coupled to each other can form a series capacitor of the high-pass filter 3. Wherein, at least part of the conductors 31 extend towards the bottom wall of the cavity 11 to form a supporting piece 33 fixed with the cavity 11, the supporting piece 33 is used for supporting the conductors 31 to improve the structural stability of the conductors 31, and the supporting piece 33 is formed by extending the conductors 31 towards the bottom wall of the cavity 11, so that the supporting piece 33 and the bottom wall of the cavity 11 can form a parallel inductance of the high-pass filter path 3.
The passband bandwidth of the high-pass filter path 3 can reach 1400-4200MHz, and the series capacitor and the parallel inductor can form a chebyshev type filter path, so that the rectangular coefficient of the high-pass filter path 3 is small and is closer to 1, the steeper the filter characteristic curve is, the good selectivity is achieved, and the insertion loss is less than or equal to 0.2dB.
Referring to fig. 2, 3 and 5, the conductor 31 includes a first conductor 311 and a second conductor 312 connected to each other, and the first conductor 311 has a substantially stepped shape, for example, a cross-sectional area of the first conductor 311 is larger than a cross-sectional area of the second conductor 312. The first conductor 311 is provided with a connection hole 313 at one end far away from the second conductor 312, the second conductor 312 extends towards a direction far away from the first conductor 311, the second conductor 312 and the connection hole 313 are coaxially arranged, the diameter of the second conductor 312 is smaller than the aperture of the connection hole 313, so that the second conductor 312 of the conductor 31 can be inserted into the connection hole 313 of the first conductor 311 of the adjacent conductor 31 to realize mutual sleeving of the adjacent conductors 31, and the diameter of the second conductor 312 is smaller than the aperture of the connection hole 313, so that a gap exists between the correspondingly arranged second conductor 312 and the connection hole 313 to realize capacitive coupling connection of the two adjacent conductors 31.
Preferably, the second conductor 312 in this embodiment is cylindrical, and the connection hole 313 provided corresponding thereto is a circular hole. In other embodiments, the second conductor 312 may be configured as a square pillar or a hexagonal pillar, and the connection hole 313 may be configured as a square hole or a hexagonal hole.
Please refer to fig. 5, the supporting member 33 is connected between the first conductor 311 and the bottom wall of the cavity 11, the supporting member 33 is a metal supporting rod fixedly connected with the first conductor 311, the metal supporting rod is connected with the bottom wall of the cavity 11 to form the shunt inductor 62 of the high-pass filtering path 3, the metal supporting rod is perpendicular to the bottom wall of the cavity 11, one end of the metal supporting rod, which is close to the bottom wall of the cavity 11, is provided with a mounting hole 331, the mounting hole 331 is coaxially arranged with the metal supporting rod, so that a threaded fastener can penetrate through the bottom wall of the cavity 11 and be inserted into the mounting hole 331 to realize connection of the metal supporting rod with the bottom wall of the cavity 11, and the metal supporting rod can play a role of supporting the conductor 31, fix the metal supporting rod with the bottom wall of the cavity 11, and play a role of fixing and limiting the conductor 31.
Preferably, the mounting hole 331 is a threaded hole, and the threaded fastener may be a screw or a bolt.
In addition, the dielectric member 32 is disposed between two adjacent conductors 31 to separate the adjacent conductors 31, so that short-circuits caused by direct contact between the adjacent conductors 31 can be avoided. The dielectric member 32 includes a dielectric sleeve 321 interposed between the second conductor 312 and the connection hole 313, an outer diameter of the dielectric sleeve 321 is matched with a diameter of the connection hole 313, an inner diameter of the dielectric sleeve 321 is matched with a diameter of the second conductor 312, that is, the second conductor 312 is sleeved with the dielectric sleeve 321 and then inserted into the connection hole 313 of the adjacent first conductor 311, and an inner diameter and an outer diameter of the dielectric sleeve 321 are matched with the second conductor 312 and the connection hole 313 in decibels, so that the second conductor 312 has higher stability when being inserted into the first conductor 311 adjacent to the second conductor 312.
The dielectric member 32 further includes a dielectric sheet 322 disposed at one end of the dielectric sleeve 321 near the junction between the first conductor 311 and the second conductor 312, where the dielectric sheet 322 extends radially outward from the dielectric sleeve 321, and the first conductors 311 of adjacent conductors 31 are separated by the dielectric sheet 322.
The dielectric members 32 arranged among the conductors 31 can replace air to realize the capacitive coupling of the adjacent conductors 31, increase the dielectric constant among the conductors 31, realize larger capacitive coupling and wider passband bandwidth, be beneficial to reducing the volume of the filter, and prevent short circuit caused by direct contact between the adjacent conductors 31.
Further, the first conductor 311 and the second conductor 312 are integrally formed, so that structural stability is good, welding spots are reduced, falling of the welding spots caused by vibration in use is avoided, production and processing are facilitated, and batch production is facilitated.
In addition, the length of the second conductor 312 inserted into the connection hole 313 of the first conductor 311 thereof is positively correlated with the capacitance between the two conductors 31, that is, the greater the length of the connection hole 313 into which the second conductor 312 is inserted, the greater the capacitance, while the magnitude of the capacitance is related to the cut-off frequency of the filter, the greater the cut-off frequency, the smaller the capacitance thereof, so that the length of the connection hole 313 into which the second conductor 312 is inserted into the adjacent first conductor 311 thereof, that is, the length of the second conductor 312 inserted into the connection hole 313 of the adjacent conductor 31 thereof, can be determined according to the cut-off frequency of the filter, which is set to be inversely correlated with the cut-off frequency of the filter.
Meanwhile, the number of the conductors 31 in the cavity can be adjusted according to the requirement of out-of-band suppression of the filter, and the higher the number of the conductors 31 is, the higher the order of the corresponding filter passband is, and the better the out-of-band suppression effect on the corresponding frequency band is achieved; however, since the larger the number of the conductors 31 is, the more insertion loss is increased, the number of the conductors 31 can be set as large as possible within a certain insertion loss range, and the out-of-band suppressing effect can be improved.
Referring to fig. 2 and 3, the two ends of the conductor assembly are respectively provided with connectors corresponding to the input and output connection ports, and are respectively defined as a first connector 34 and a second connector 35.
Specifically, one end of the conductor assembly is a first conductor 311, the other end is a second conductor 312, the first connector 34 includes a connecting rod (not labeled in the figure, the same applies below) integrally formed with the first conductor 311 at the end of the conductor assembly, the second connector 35 is provided by the second conductor 312 at the end of the conductor assembly, and the second conductor 312 is connected to a corresponding connection port.
Alternatively, in other embodiments, the first connector 34 includes a first connecting rod 341 inserted into the connecting hole 313 of the first conductor 311 at the end of the conductor assembly and a second connecting rod 342 connecting the first connecting rod 341 and the connecting port, where the size of the first connecting rod 341 is equal to the size of the second conductor 312, and there is a capacitive coupling connection between the first connecting rod 341 and the first conductor 311; the second connection member 35 includes a connection sleeve 351 sleeved on the second conductor 312 at the end of the conductor assembly, and a third connection rod 352 for connecting the connection sleeve 351 with the connection port, where the inner diameter of the connection sleeve 351 is equal to the aperture of the connection hole 313 of the first conductor 311, and the connection sleeve 351 is in capacitive coupling connection with the second conductor 312.
Further, a dielectric member 32 may be disposed between the first connecting rod 341 and the first conductor 311 and between the connecting sleeve 351 and the second conductor 312 to separate the conductor 31 from the connecting member.
Through set up at the both ends of conductor assembly rather than the connecting piece that cup joints, can realize conductor assembly with the capacitive connection of connecting port, capacitive connection compares in the mode with conductor and the connecting port direct connection at conductor assembly both ends, and it is easier to adjust, and coupling performance is better.
Referring to fig. 1 and 4, the passband bandwidth of the low pass filter path 4 in the present embodiment is 380-960MHz, which includes the stripline filter path 42. The stripline filter path 42 includes a first metal sheet 421 and a second metal sheet 422, where the first metal sheet 421 is electrically connected to the second connection port 23, the first metal sheet 421 is located above the second metal sheet 422, and the first metal sheet 421 and the second metal sheet 422 are fixed in the low-pass filter cavity 112 by a dielectric screw. In addition, a gap is formed between the first metal sheet 421 and the second metal sheet 422 to form a capacitor, so that direct current signals can be isolated from being transmitted between the first metal sheet 421 and the second metal sheet 422.
Preferably, the first metal sheet 421 has an L-shaped structure, the high-low impedance low-pass conductor bar 411 is connected with one end of the L-shaped first metal sheet 421, the dielectric screw can penetrate through the side edge of the L-shaped first metal sheet 421 away from the end connected with the high-low impedance low-pass conductor bar 411, and the dielectric screw can penetrate through two ends of the side edge, so that the installation is convenient and the structural stability is higher.
In addition, the second metal sheet 422 includes a middle portion 4221 extending along the longitudinal direction of the cavity, and a plurality of extending portions 4222 disposed on two sides of the middle portion 4221, where the extending portions 4222 disposed on two sides of the middle portion 4221 are symmetrically disposed two by two, and a gap is formed between adjacent extending portions 4222 disposed on the same side, so that a groove (not labeled in the figure, the same applies below) is formed on the second metal sheet 422, and the second metal sheet 422 is integrally formed, a high impedance line is formed at the middle portion of the groove portion of the second metal sheet 422, and a low impedance line is formed at the extending portions 4222, so as to conform to the basic low-pass filter circuit principle, and further realize low-pass performance.
Further, a first dielectric piece 423 for separating the first metal piece 421 from the second metal piece 422 is inserted into the gap between the first metal piece 421 and the second metal piece 422, a second dielectric piece 424 is further disposed between the second metal piece 422 and the bottom wall of the cavity 11, and the first metal piece 421, the first dielectric piece 423, the second metal piece 422 and the second dielectric piece 424 are sequentially disposed from top to bottom and penetrate through the first metal piece, the second metal piece and the second dielectric piece 423 and are fixed in the cavity 11 through dielectric screws.
The first metal sheet 421, the first dielectric sheet 423, the second metal sheet 422 and the second dielectric sheet 424 in the low-pass filter cavity 112 may form a strip line filter path 42 in the low-pass filter path 4, the cut-off frequency of the strip line filter path is 975MHz, and the first metal sheet 421 and the second metal sheet 422 are connected in a capacitive coupling manner, so that a direct current signal in the signal can be isolated.
In addition, the first dielectric piece 423 and the second dielectric piece 424 both play a role of supporting metal pieces, and in addition, the first dielectric piece 423 is inserted between the first metal piece 421 and the second metal piece 422, so that the capacitive coupling between the first metal piece 421 and the second metal piece 422 can be realized instead of air, the dielectric constant between the first metal piece 421 and the second metal piece 422 is increased, larger capacitive coupling and wider passband bandwidth can be realized, the size of the filter is reduced, and meanwhile, short circuit caused by touch between the first metal piece 421 and the second metal piece 422 can be prevented.
Further, a high-low impedance low-pass filter path 41 may be provided between the second connection port and the strip line filter path 42. The high-low impedance low-pass filter path 41 includes a high-low impedance low-pass conductor rod 411 electrically connected to the inner conductor 31 of the second connection port 23, one end of the high-low impedance low-pass conductor rod 411 is connected to the inner conductor of the second connection port 23, the other end is connected to the first metal sheet 421, and the high-low impedance low-pass conductor rod 411 is sleeved with an annular dielectric sleeve 412 to be installed in a port hole of the second connection port 23, so that the high-low impedance low-pass filter path 41 is formed among the high-low impedance low-pass conductor rod 411, the annular dielectric sleeve 412 and the side wall of the cavity 11, and the cut-off frequency thereof can reach 2GHz, thereby filtering out high-frequency harmonic peaks above 2.7 GHz.
The cavity 11 is close to the public port 21 and is provided with a filter capacitor 5 which is respectively and electrically connected with the high-pass filter path 3 and the low-pass filter path 4, the filter capacitor 5 is arranged at the partition 13, a dielectric pad 52 is arranged at the bottom of the filter capacitor to play a role in supporting, a wire 51 is connected in series on the filter capacitor 5, the filter capacitor 5 is respectively connected with a conductor 31 at the end part of a conductor component in the high-pass filter path 3 through the wire 51, and the other end of the filter capacitor 5 is connected with a second metal sheet 422 in the low-pass filter path 4. The filter capacitor 5 and the lead 51 are connected to form a series resonant circuit, which can pass low-frequency signals and has a certain inhibition effect on high-frequency signals.
Preferably, the common port 21 is disposed corresponding to the high-pass filter cavity 111 of the cavity 11, the conductor component of the high-pass filter path 3 is directly connected to the inner conductor 31 of the common port 21 through the second connection member 35, and the second metal sheet 422 of the low-pass filter path 4 is electrically connected to the common port 21 through the filter capacitor 5 and the wire 51. When the external signal enters the cavity 11 from the common port 21, the high-frequency signal is directly transmitted in the high-pass filter cavity 111, and the low-frequency signal passes through the filter capacitor 5 through the wire 51 and then enters the low-pass filter cavity 112 for transmission, and the filter capacitor 5 can isolate the high-frequency signal from the low-frequency signal.
Further, when the high-low path combiner 1000 is connected to other devices in the antenna, the high-low path combiner 1000 may also be used to split/combine the dc control signal for controlling the antenna parameters. Specifically, three wave traps 61 are disposed in the cavity 11, the three wave traps 61 are respectively connected with the common port 21, the first connection port 22 and the second connection port 23 in series with the inductor 62 in a one-to-one correspondence manner, and a connection board (not illustrated in the figure, the same applies below) is disposed on the cover 12 to electrically connect the three wave traps 61 to each other, and when the cover 12 is covered with the cavity 11, the three wave traps 61 are electrically connected to realize signal transmission.
The inductance 62 connected in series with the trap 61 correspondingly connected to the first connection port 22 is connected with the conductor 31 of the conductor assembly near the end of the first connection port 22, the inductance 62 connected in series with the trap 61 correspondingly connected to the second connection port 23 is connected with the L-shaped first metal sheet 421, the inductance 62 connected in series with the trap 61 correspondingly connected to the common port 21 is connected with the second metal sheet 422, and the three traps 61 are communicated through a connection board to realize transmission of direct current control signals. Meanwhile, the filter capacitor 5 may be used as a bypass capacitor for the dc signal, so that the dc control signal output by the trap 61 connected to the common port 21 may be transmitted to the common port 21 through the filter capacitor 5, thereby implementing the output of the dc control signal.
In addition, a plurality of tuning screws 7 are further arranged on the cover plate 12, threaded through holes are formed in positions, corresponding to the tuning screws 7, of the cover plate 12, so that the tuning screws 7 are in threaded connection with the cover plate 12, a plurality of tuning screws 7 are arranged corresponding to a plurality of conductors 31 and low-pass metal sheets, the tuning screws 7 are suspended above the conductors 31 and the low-pass metal sheets through the cover plate 12, and the tuning screws 7 are kept in non-contact connection with the conductors 31 and the low-pass metal sheets all the time. By adjusting the relative distance between the tuning screw 7 and the conductor 31 or the low-pass metal sheet, the resonant frequency of the high-pass filter path 3 or the low-pass filter path 4 can be adjusted, so that the resonant frequencies of the high-pass filter path 3 and the low-pass filter path are controlled within the corresponding passband frequency range.
The high-low pass combiner 1000 integrates the high-pass filtering path 3 and the low-pass filtering path 4 in the same cavity 11, so that the high-low pass combiner can realize coexistence of a 5G technical system and an existing system, the passband of the low-pass filtering path 4 is 380-960MHz, the passband of the high-pass filtering path 3 can reach 1400-4200MHz, the high-pass filtering path 3 adopts a structure that a plurality of conductors 31 are mutually sleeved to form a series capacitor, and meanwhile, the high-pass filtering path 3 forms a Chebyshev filtering path through a supporting metal sheet used for supporting the conductor 31 structure and forming a parallel inductor 62 with the bottom wall of the cavity 11, the filtering characteristic curve is steep, the rectangular coefficient is approximately 1, the passband coefficient can reach 1.284 in a specific simulation test, the high-pass filtering path 3 has good selectivity to a corresponding frequency band, the isolation degree is more than or equal to 50dB, and the insertion loss is less than or equal to 0.2dB.
In summary, the high-low pass combiner 1000 of the present invention can achieve a combined passband bandwidth up to 3820MHz, has a higher isolation, and can meet the requirement of 5G to high frequency band development. The low-pass filter path 4 is formed by combining the high-low impedance low-pass filter path 41 and the strip line filter path 42, so that the high-pass filter path has good selectivity, simple structure and easy production and processing, and the high-pass filter path 3 is formed by sleeving a plurality of conductors 31, so that the high-pass filter path has good structural consistency and is suitable for mass production.
The foregoing is only a partial embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The utility model provides a high low pass combiner, includes the cavity and with the apron of cavity looks lid dress, be equipped with the cavity of lengthwise formula in the cavity, and in cavity lengthwise's both ends are equipped with the connection port that is used for input and output respectively, characterized by: the cavity is internally provided with a baffle plate for separating the cavity to form a high-pass filtering cavity and a low-pass filtering cavity, and the baffle plate extends along the longitudinal direction of the cavity;
the high-pass filter cavity is internally provided with a conductor assembly, two ends of which are respectively and correspondingly electrically connected with the input and output connecting ports, the conductor assembly comprises a plurality of conductors, and the conductors are arranged along the longitudinal direction of the cavity and are sequentially and capacitively coupled;
the low-pass filter cavity is internally provided with a strip line filter passage, and two ends of the strip line filter passage are respectively and correspondingly electrically connected with the input and output connection ports;
at least a portion of the conductors extend toward the bottom wall of the cavity and form a support secured to the cavity;
the support piece is electrically connected with the conductor and the bottom wall of the cavity, and the support piece and the bottom wall of the cavity form a parallel inductor of the high-pass filtering path;
and a plurality of tuning screws are further arranged on the cover plate, the tuning screws are arranged corresponding to the conductors, the tuning screws are suspended above the conductors through the cover plate, and the tuning screws are kept in non-contact connection with the conductors.
2. The high-low pass combiner of claim 1, wherein: the support piece comprises a metal support rod, and one end, far away from the conductor, of the metal support rod is provided with a mounting hole for penetrating a fastener penetrating through the bottom wall of the cavity to be used for fixing the metal support rod and the cavity.
3. The high-low pass combiner of claim 1, wherein: the conductor comprises a first conductor and a second conductor, the supporting piece is arranged on the first conductor, a connecting hole is formed in one side, opposite to the second conductor, of the first conductor, the connecting hole and the second conductor are coaxially arranged, and two adjacent conductors are connected in a sleeved mode through the corresponding second conductors and the connecting holes in a coupling mode.
4. A high-low pass combiner according to claim 3, characterized in that: the length of the second conductor inserted into the connection hole of its neighboring conductor is set to be inversely related to the cut-off frequency of the filter.
5. A high-low pass combiner according to claim 3, characterized in that: a medium piece is arranged between two adjacent conductors, and comprises a medium sleeve inserted between the second conductor and the connecting hole and a medium sheet arranged at the end part of the medium sleeve and used for separating the first conductors of the adjacent conductors.
6. The high-low pass combiner of claim 1, wherein: the connecting port comprises a public port, a first connecting port and a second connecting port, wherein the public port is arranged at one of two ends of the cavity along the longitudinal direction of the cavity and is connected with the high-pass filtering cavity and the low-pass filtering cavity, the first connecting port and the second connecting port are arranged at the other end of the cavity opposite to the public port, the first connecting port is connected with the high-pass filtering cavity, and the second connecting port is connected with the low-pass filtering cavity.
7. The high-low pass combiner of claim 6, wherein: the strip line filtering path comprises a first metal sheet and a second metal sheet;
the first metal sheet is positioned above the second metal sheet, a gap is formed between the first metal sheet and the second metal sheet, and the first metal sheet and the second metal sheet are fixed in the cavity through medium screws;
the first metal sheet is connected with the second connecting port;
the second metal sheet is connected with the common port, and comprises a middle part arranged along the longitudinal direction of the cavity and extension parts positioned at two sides of the middle part, and a gap is reserved between adjacent extension parts positioned at the same side of the middle part so as to form a groove of the second metal sheet.
8. The high-low pass combiner of claim 7, wherein: and a high-low impedance low-pass filter passage connected between the second connection port and the strip line filter passage is also arranged in the low-pass filter cavity.
9. The high-low pass combiner of claim 6, wherein: and a filter capacitor and a wire connected in series with the filter capacitor are further arranged on one side of the cavity, which is close to the public port, and the filter capacitor is respectively connected with the conductor component in the high-pass filter cavity and the strip line filter path in the low-pass filter cavity through wires.
10. The high-low pass combiner of claim 6, wherein: three wave traps are arranged in the cavity and are connected in one-to-one correspondence to the public port, the first connecting port and the second connecting port, and a connecting plate for enabling the three wave traps to be electrically connected with each other is arranged on the cover plate.
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| CN201910707832.XA CN110416675B (en) | 2019-08-01 | 2019-08-01 | High-low pass combiner |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203300776U (en) * | 2013-05-06 | 2013-11-20 | 京信通信技术(广州)有限公司 | Communication cavity device and low-pass filtering path |
| CN104659453A (en) * | 2013-11-21 | 2015-05-27 | 罗森伯格（上海）通信技术有限公司 | Wideband line combiner |
| CN107394332A (en) * | 2017-08-10 | 2017-11-24 | 京信通信系统（中国）有限公司 | Common port coupling device and microwave cavity device |
| CN209183693U (en) * | 2018-12-18 | 2019-07-30 | 京信通信系统（中国）有限公司 | Radio frequency cavity devices |
| CN210092307U (en) * | 2019-08-01 | 2020-02-18 | 京信通信技术(广州)有限公司 | High-low pass combiner |
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2019
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203300776U (en) * | 2013-05-06 | 2013-11-20 | 京信通信技术(广州)有限公司 | Communication cavity device and low-pass filtering path |
| CN104659453A (en) * | 2013-11-21 | 2015-05-27 | 罗森伯格（上海）通信技术有限公司 | Wideband line combiner |
| CN107394332A (en) * | 2017-08-10 | 2017-11-24 | 京信通信系统（中国）有限公司 | Common port coupling device and microwave cavity device |
| CN209183693U (en) * | 2018-12-18 | 2019-07-30 | 京信通信系统（中国）有限公司 | Radio frequency cavity devices |
| CN210092307U (en) * | 2019-08-01 | 2020-02-18 | 京信通信技术(广州)有限公司 | High-low pass combiner |
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