CN116995386A - Out-of-band suppression enhanced combiner - Google Patents
Out-of-band suppression enhanced combiner Download PDFInfo
- Publication number
- CN116995386A CN116995386A CN202310997028.6A CN202310997028A CN116995386A CN 116995386 A CN116995386 A CN 116995386A CN 202310997028 A CN202310997028 A CN 202310997028A CN 116995386 A CN116995386 A CN 116995386A
- Authority
- CN
- China
- Prior art keywords
- pass
- low
- open
- intersection
- branch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000001629 suppression Effects 0.000 title abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 236
- 238000000034 method Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 9
- 230000007423 decrease Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000004088 simulation Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Abstract
The invention relates to an out-of-band rejection enhancement combiner, which comprises a combining end, a low-pass filter and a high-pass filter; the low-pass filter comprises a low-pass transmission main line, a low-pass branching end, a first low-pass open branch, a second low-pass open branch, a third low-pass open branch and a low-pass short branch; the low-pass short circuit branch node connects the low-pass transmission main circuit into a ring shape and simultaneously directly conducts the first low-pass open circuit branch node and the third low-pass open circuit branch node; the high-pass filter comprises a high-pass transmission main line, a high-pass branching end, a first high-pass open-circuit branch knot, a second high-pass open-circuit branch knot, a third high-pass open-circuit branch knot, a fourth high-pass open-circuit branch knot and a high-pass short-circuit branch knot; the high-pass short-circuit branch is used for connecting the high-pass transmission main circuit into a ring shape and simultaneously directly conducting the second high-pass open-circuit branch with the fourth high-pass open-circuit branch. The invention has the characteristics of fast decline of the filter stop band and high out-of-band suppression, is suitable for processing radio frequency signals with two frequency ranges close to each other, and the like.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to an out-of-band suppression enhanced combiner.
Background
The combiner is generally used at the transmitting end, and functions to combine two or more radio frequency signals sent from different transmitters into one radio frequency device sent to the antenna, and meanwhile, avoid the mutual influence between the signals of all ports. Traditional PCB combiners often employ filter schemes in the form of branches or couplings, which have slow stopbands and low out-of-band rejection, and are not suitable for processing radio frequency signals with two frequency ranges close together. Some combiner capable of improving out-of-band rejection is also presented on the market, and is generally like the technical scheme described in the patent application number 202022494971X and named as a ring combiner, the technical scheme discloses that the head and tail ends of a transmission main line are conducted through short-circuit branches and a structure of an open-circuit branch is arranged, but because the conduction intersection of the transmission main line and the short-circuit branch is far away from the conduction intersection of the open-circuit branch and the transmission main line, the out-of-band rejection capability of a filter can be improved, but the stop band of the filter is slowly reduced, and the filter is also not suitable for processing radio frequency signals with two frequency ranges close to each other.
Disclosure of Invention
The invention aims to provide an out-of-band rejection enhancement type combiner which has the advantages of simple structure, reasonable design, fast filter stop band drop, high out-of-band rejection, suitability for processing radio frequency signals with two frequency ranges close to each other, and the like.
The technical scheme of the invention is realized as follows: an out-of-band rejection enhancement combiner comprises a combiner, a low-pass filter and a high-pass filter; in particular, the low-pass filter comprises a low-pass transmission main line, a low-pass branching end, a first low-pass open branch, a second low-pass open branch, a third low-pass open branch and a low-pass short branch; wherein:
one end of the low-pass transmission main line is communicated with the combining end, and the other end of the low-pass transmission main line is communicated with the low-pass branching end;
one end of each of the first low-pass open-circuit branch knot, the second low-pass open-circuit branch knot and the third low-pass open-circuit branch knot is intersected with and communicated with the low-pass transmission main line;
the conduction intersection of the first low-pass open branch knot and the low-pass transmission main line is A1, the conduction intersection of the second low-pass open branch knot and the low-pass transmission main line is A2, the conduction intersection of the third low-pass open branch knot and the low-pass transmission main line is A3, and the conduction intersection A1, the conduction intersection A2 and the conduction intersection A3 are sequentially arranged on the low-pass transmission main line along the direction from the combining end to the low-pass splitting end;
one end of the low-pass short circuit branch is conducted with the conduction intersection A1, and the other end of the low-pass short circuit branch is conducted with the conduction intersection A3;
the high-pass filter comprises a high-pass transmission main line, a high-pass branching end, a first high-pass open-circuit branch knot, a second high-pass open-circuit branch knot, a third high-pass open-circuit branch knot, a fourth high-pass open-circuit branch knot and a high-pass short-circuit branch knot; wherein:
one end of the high-pass transmission main line is communicated with the combining end, and the other end of the high-pass transmission main line is communicated with the high-pass branching end;
one end of each of the first high-pass open-circuit branch knot, the second high-pass open-circuit branch knot, the third high-pass open-circuit branch knot and the fourth high-pass open-circuit branch knot is intersected with the high-pass transmission main line and is communicated;
the conduction intersection of the first high-pass open branch knot and the high-pass transmission main line is B1, the conduction intersection of the second high-pass open branch knot and the high-pass transmission main line is B2, the conduction intersection of the third high-pass open branch knot and the high-pass transmission main line is B3, the conduction intersection of the fourth high-pass open branch knot and the high-pass transmission main line is B4, and the conduction intersection B1, the conduction intersection B2, the conduction intersection B3 and the conduction intersection B4 are sequentially arranged on the high-pass transmission main line along the direction from the combining end to the high-pass branch end;
one end of the high-pass short-circuit branch is conducted with the conducting intersection B2, and the other end of the high-pass short-circuit branch is conducted with the conducting intersection B4.
The low-pass short circuit branch of the low-pass filter connects the low-pass transmission main line into a ring shape, and simultaneously, the low-pass short circuit branch also directly conducts the first low-pass open circuit branch with the third low-pass open circuit branch; the high-pass short-circuit branch of the high-pass filter connects the high-pass transmission main line into a ring shape, and meanwhile, the high-pass short-circuit branch also directly conducts the second high-pass open-circuit branch with the fourth high-pass open-circuit branch, so that the high-pass filter and the low-pass filter have the advantages of fast stop band descending and high out-of-band suppression when the circuit layout structure is applied, and the circuit layout structure is very suitable for processing radio frequency signals with two frequency ranges close to each other.
Further, a conduction intersection A1 on the low-pass transmission main line is arranged close to the combining end, and a conduction intersection A3 on the low-pass transmission main line is arranged close to the low-pass splitting end; the conducting intersection B4 on the high-pass transmission main line is positioned at the end of the high-pass transmission main line connected with the high-pass branching end.
Further, the low-pass filter further comprises a fourth low-pass open branch, one end of the fourth low-pass open branch is intersected with the low-pass transmission main line and is conducted, the conducting intersection of the fourth low-pass open branch and the low-pass transmission main line is A4, and the conducting intersection A4 of the low-pass transmission main line is located between the low-pass branching end and the conducting intersection A3.
Further, a difference between a lower limit of the passband frequency of the high pass filter and an upper limit of the passband frequency of the low pass filter is in a range of 50MHz to 80 MHz.
Further, the passband frequencies of the low-pass filter and the high-pass filter are both in the range of 600 MHz-2500 MHz.
Further, the part from the end of the low-pass transmission main line, which is communicated with the combining end, to the communicated intersection A1 is a first low-pass transmission section, the length L1 of the first low-pass transmission section is in the range of 30 mm-45 mm, and the width W1 of the first low-pass transmission section is in the range of 4 mm-10 mm;
the part from the conduction intersection A1 to the conduction intersection A3 on the low-pass transmission main line is a second low-pass transmission section, the second low-pass transmission section is intersected with one end of a second low-pass open-circuit branch at the midpoint of the length direction and is conducted, the length L2 of the second low-pass transmission section is in the range of 270 mm-290 mm, and the width W2 of the second low-pass transmission section is in the range of 1.5 mm-10 mm;
the part from the end connected with the low-pass branching end to the conduction intersection A3 on the low-pass transmission main line is a third low-pass transmission section, the length L3 of the third low-pass transmission section is in the range of 30 mm-45 mm, and the width W3 of the third low-pass transmission section is in the range of 3 mm-8 mm;
the length L4 of the first low-pass open branch is in the range of 60-80 mm, and the width W4 of the first low-pass open branch is in the range of 4-10 mm;
the length L5 of the second low-pass open branch is in the range of 45-70 mm, and the width W5 of the second low-pass open branch is in the range of 0.8-5 mm;
the length L6 of the third low-pass open branch is in the range of 15 mm-80 mm, and the width W6 of the third low-pass open branch is in the range of 1 mm-8 mm;
the length L7 of the low-pass short circuit branch is in the range of 25-40 mm, and the width W7 of the low-pass short circuit branch is in the range of 4-10 mm.
Further, the low-pass filter further comprises a fourth low-pass open-circuit branch, one end of the fourth low-pass open-circuit branch is intersected with the third low-pass transmission section and is conducted, the length L8 of the fourth low-pass open-circuit branch is in the range of 60 mm-70 mm, and the width W8 of the fourth low-pass open-circuit branch is in the range of 2.5 mm-3.5 mm; the conducting intersection of the fourth low-pass open branch and the third low-pass transmission section is A4; the distance D1 from the conducting intersection A4 to the conducting intersection A3 is in the range of 15 mm-20 mm, and the width W9 of the section from the conducting intersection A4 to the conducting intersection A3 on the third low-pass transmission section is in the range of 3 mm-3.5 mm; the distance D2 from the conduction intersection A4 to the low-pass branching end is in the range of 10 mm-15 mm, and the width W10 of the section from the conduction intersection A4 to the low-pass branching end on the third low-pass transmission section is in the range of 3.5 mm-4 mm.
Further, the part from the end, which is communicated with the combining end, of the high-pass transmission main line to the conducting intersection B1 is a first high-pass transmission section, the length C1 of the first high-pass transmission section is in the range of 6 mm-12 mm, and the width K1 of the first high-pass transmission section is in the range of 0.6 mm-1.5 mm;
the part from the conduction intersection B1 to the conduction intersection B2 on the high-pass transmission main line is a second high-pass transmission section, the length C2 of the second high-pass transmission section is in the range of 85 mm-95 mm, and the width K2 of the second high-pass transmission section is in the range of 2 mm-3 mm;
the part from the conduction intersection B2 to the conduction intersection B3 on the high-pass transmission main line is a third high-pass transmission section, the length C3 of the third high-pass transmission section is in the range of 100 mm-160 mm, and the width K3 of the third high-pass transmission section is in the range of 0.8 mm-3.5 mm;
the part from the conduction intersection B3 to the conduction intersection B4 on the high-pass transmission main line is a fourth high-pass transmission section, the length C4 of the fourth high-pass transmission section is in the range of 2.5 mm-8.5 mm, and the width K4 of the fourth high-pass transmission section is in the range of 2 mm-3.5 mm;
the high-pass transmission main line is conducted with a high-pass branching end at a conduction intersection B4;
the length C5 of the first high-pass open branch is in the range of 90-110 mm, and the width K5 of the first high-pass open branch is in the range of 2.5-4.5 mm;
the second high-pass open branch comprises a first section and a second section, one end of the first section is intersected with the high-pass transmission main line and is communicated with the high-pass transmission main line, and the other end of the first section is communicated with one end of the second section; the length C6 of the first section is in the range of 40 mm-50 mm, and the width K6 of the first section is in the range of 1 mm-4 mm; the length C7 of the second section is in the range of 85 mm-100 mm, and the width K7 of the second section is in the range of 10 mm-20 mm;
the length C8 of the third high-pass open branch is in the range of 75-95 mm, and the width K8 of the third high-pass open branch is in the range of 1.5-4 mm;
the length C9 of the fourth high-pass open branch is in the range of 45 mm-65 mm, and the width K9 of the fourth high-pass open branch is in the range of 2.5 mm-6 mm;
the length C10 of the high-pass short-circuit branch is in the range of 25 mm-35 mm, and the width K10 of the high-pass short-circuit branch is in the range of 0.6 mm-1.2 mm.
Further, the first low-pass open-circuit branch, the second low-pass open-circuit branch, the third low-pass open-circuit branch and the low-pass short-circuit branch of the low-pass filter are of a linear or curved structure; the first high-pass open-circuit branch, the second high-pass open-circuit branch, the third high-pass open-circuit branch, the fourth high-pass open-circuit branch and the high-pass short-circuit branch of the high-pass filter are of a linear type or a bent type structure.
Further, the combiner further comprises a PCB, wherein the high-pass filter, the low-pass filter and the combining end are formed on one surface of the PCB in a copper-clad mode.
The invention has the beneficial effects that: the filter has the advantages of simple structure, reasonable design, fast decline of the stop band of the filter, high out-of-band suppression, suitability for processing radio frequency signals with two frequency ranges close to each other, and the like.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1.
Fig. 2 is a schematic diagram of the low-pass filter of embodiment 1.
Fig. 3 is a schematic diagram of the structure of the high-pass filter of embodiment 1.
Fig. 4 is a graph showing the results of the simulation test in example 1.
Fig. 5 is a schematic structural diagram of embodiment 2.
Fig. 6 is a graph of simulation test results of example 2.
Fig. 7 is a schematic structural diagram of embodiment 3.
Fig. 8 is a graph of simulation test results of example 3.
Reference numerals illustrate: 1-a combining end; a 2-low pass filter; 21-a low-pass transmission main line; 22-a low-pass branching end; 23-first low-pass open-circuit knots; 24-second low-pass open-circuit knots; 25-third low-pass open-circuit knots; 26-low-pass short circuit branches; 27-a first low-pass transmission section; 28-a second low-pass transmission section; 29-a third low-pass transmission section; 210-fourth low-pass open-circuit knots; a 3-high pass filter; 31-a high-pass transmission main line; 32-high-pass branching ends; 33-first high-pass open-circuit knots; 34-a second high-pass open-circuit stub; 341-a first section; 342-second stage; 35-third high-pass open branches; 36-fourth high-pass open-circuit knots; 37-high-pass short-circuit branches; 38-a first high-pass transmission section; 39-a second high-pass transmission section; 310-a third high-pass transmission segment; 320-a fourth high-pass transmission section; 4-PCB board.
Detailed Description
Example 1
As shown in fig. 1, 2 and 3, the out-of-band rejection enhancement combiner of the present embodiment includes a combining end 1, a low-pass filter 2 and a high-pass filter 3; the low-pass filter 2 comprises a low-pass transmission main line 21, a low-pass branching end 22, a first low-pass open branch 23, a second low-pass open branch 24, a third low-pass open branch 25 and a low-pass short branch 26; wherein:
one end of the low-pass transmission main line 21 is communicated with the combining end 1, and the other end of the low-pass transmission main line 21 is communicated with the low-pass splitting end 22;
one end of each of the first low-pass open branch 23, the second low-pass open branch 24 and the third low-pass open branch 25 is intersected with the low-pass transmission main line 21 and is conducted;
the conducting intersection of the first low-pass open branch knot 23 and the low-pass transmission main line 21 is A1, the conducting intersection of the second low-pass open branch knot 24 and the low-pass transmission main line 21 is A2, the conducting intersection of the third low-pass open branch knot 25 and the low-pass transmission main line 21 is A3, and the conducting intersection A1, the conducting intersection A2 and the conducting intersection A3 are sequentially arranged on the low-pass transmission main line 21 along the direction from the combining end 1 to the low-pass splitting end 22;
one end of the low-pass short circuit branch 26 is communicated with the communicated intersection A1, and the other end of the low-pass short circuit branch 26 is communicated with the communicated intersection A3;
the high-pass filter 3 comprises a high-pass transmission main line 31, a high-pass branching end 32, a first high-pass open branch 33, a second high-pass open branch 34, a third high-pass open branch 35, a fourth high-pass open branch 36 and a high-pass short branch 37; wherein:
one end of the high-pass transmission main line 31 is communicated with the combining end 1, and the other end of the high-pass transmission main line 31 is communicated with the high-pass branching end 32;
one end of each of the first high-pass open branch 33, the second high-pass open branch 34, the third high-pass open branch 35 and the fourth high-pass open branch 36 is intersected with the high-pass transmission main line 31 and is conducted;
the conducting intersection of the first high-pass open branch knot 33 and the high-pass transmission main line 31 is B1, the conducting intersection of the second high-pass open branch knot 34 and the high-pass transmission main line 31 is B2, the conducting intersection of the third high-pass open branch knot 35 and the high-pass transmission main line 31 is B3, the conducting intersection of the fourth high-pass open branch knot 36 and the high-pass transmission main line 31 is B4, and the conducting intersections B1, the conducting intersections B2, the conducting intersections B3 and the conducting intersections B4 are sequentially arranged on the high-pass transmission main line 31 along the direction from the combining end 1 to the high-pass splitting end 32;
one end of the high-pass short-circuit branch 37 is communicated with the communicated intersection B2, and the other end of the high-pass short-circuit branch 37 is communicated with the communicated intersection B4.
In order to make the structure of the out-of-band suppression enhancement combiner more reasonable, as shown in fig. 1, 2 and 3, a conduction intersection A1 on the low-pass transmission main line 21 is arranged close to the combining end 1, and a conduction intersection A3 on the low-pass transmission main line 21 is arranged close to the low-pass splitting end 22; the conduction intersection B4 on the high-pass transmission main line 31 is on the end of the high-pass transmission main line 31 to which the high-pass branching end 32 is connected.
In order to make the low-pass filter 2 pass the radio frequency signal with the passband frequency of 1710MHz-1830MHz, as shown in fig. 1 and 2, the portion from the end of the low-pass transmission main line 21 connected with the combining end 1 to the connection intersection A1 is a first low-pass transmission section 27, where the length L1 of the first low-pass transmission section 27 is 35.8mm, and the width W1 of the first low-pass transmission section 27 is 4.3mm;
the part from the conduction intersection A1 to the conduction intersection A3 on the low-pass transmission main line 21 is a second low-pass transmission section 28, the second low-pass transmission section 28 is intersected with one end of the second low-pass open branch 24 at the midpoint of the length direction to be conducted, the length L2 of the second low-pass transmission section 28 is 284.1mm, and the second low-pass transmission section 28 is bent to form three sections, so that the length L2 of the second low-pass transmission section 28 is equal to the sum of L21, L22 and L23, and the width W2 of the second low-pass transmission section 28 is 2.1mm;
the part from the end connected with the low-pass branching end 22 to the conduction intersection A3 on the low-pass transmission main line 21 is a third low-pass transmission section 29, the length L3 of the third low-pass transmission section 29 is 31.3mm, and the width W3 of the third low-pass transmission section 29 is in the range of 3 mm-8 mm;
the length L4 of the first low-pass open stub 23 is 67.5, and the width W4 of the first low-pass open stub 23 is 4.2mm;
the length L5 of the second low-pass open stub 24 is 50.3mm and the width W5 of the second low-pass open stub 24 is 1mm;
the length L6 of the third low-pass open stub 25 is 19.4mm, and the width W6 of the third low-pass open stub 25 is 2.1mm;
the length L7 of the low-pass short-circuit branch 26 is 29.1mm, and the width W7 of the low-pass short-circuit branch 26 is 7.1mm.
In order to make the stopband of the low-pass filter 2 drop faster and the out-of-band rejection capability higher, as shown in fig. 1 and 2, the low-pass filter 2 further includes a fourth low-pass open-circuit branch 210, and one end of the fourth low-pass open-circuit branch 210 intersects the third low-pass transmission section 29 to be conducted, where the length L8 of the fourth low-pass open-circuit branch 210 is 66.1mm, and the width W8 of the fourth low-pass open-circuit branch 210 is 3mm; the conducting intersection of the fourth low-pass open branch 210 and the third low-pass transmission segment 29 is A4, the distance D1 from the conducting intersection A4 to the conducting intersection A3 is 18.2mm, the width W9 of the segment from the conducting intersection A4 to the conducting intersection A3 on the third low-pass transmission segment 29 is 3.4mm, the distance D2 from the conducting intersection A4 to the low-pass branching end 22 is 13.1mm, and the width W10 of the segment from the conducting intersection A4 to the low-pass branching end 22 on the third low-pass transmission segment 29 is 3.8mm.
In order to make the high-pass filter 3 pass the radio frequency signal with the passband frequency of 1885MHz-2025MHz, the passband frequencies of the low-pass filter 2 and the high-pass filter 3 in this embodiment are both in the range of 600 MHz-2500 MHz, the difference between the lower limit of the passband frequency of the high-pass filter 3 and the upper limit of the passband frequency of the low-pass filter 2 is only 55MHz, as shown in fig. 1 and 3, the part from the end of the high-pass transmission main line 31, which is conducted with the combining end 1, to the conduction intersection B1 is a first high-pass transmission section 38, the length C1 of the first high-pass transmission section 38 is 10mm, and the width K1 of the first high-pass transmission section 38 is 1.2mm;
the part from the conduction intersection B1 to the conduction intersection B2 on the high-pass transmission main line 31 is a second high-pass transmission section 39, the length C2 of the second high-pass transmission section 39 is 90.5mm, and the width K2 of the second high-pass transmission section 39 is 2.5mm;
the part from the conduction intersection B2 to the conduction intersection B3 on the high-pass transmission main line 31 is a third high-pass transmission section 310, the length C3 of the third high-pass transmission section 310 is 147.7mm, and the third high-pass transmission section 310 is bent to form six sections, so that the length C3 of the third high-pass transmission section 310 is equal to the sum of C31, C32, C33, C34, C35 and C36, and the width K3 of the third high-pass transmission section 310 is 2.7mm;
the part from the conduction intersection B3 to the conduction intersection B4 on the high-pass transmission main line 31 is a fourth high-pass transmission section 320, the length C4 of the fourth high-pass transmission section 320 is 3.1mm, and the width K4 of the fourth high-pass transmission section 320 is 2.8mm;
the high-pass transmission main line 31 is conducted with the high-pass branching end 32 at a conduction intersection B4;
the length C5 of the first high-pass open stub 33 is 95.4mm, and the width K5 of the first high-pass open stub 33 is 4mm;
the second high-pass open-circuit branch 34 comprises a first segment 341 and a second segment 342, wherein one end of the first segment 341 is intersected with the high-pass transmission main line 31 to be conducted, and the other end of the first segment 341 is conducted with one end of the second segment 342; the length C6 of the first segment 341 is 45mm and the width K6 of the first segment 341 is 3.4mm; the length C7 of the second segment 342 is 89.2mm and the width K7 of the second segment 342 is 18.2mm;
the length C8 of the third high-pass open stub 35 is 82.4mm, and the width K8 of the third high-pass open stub 35 is 3.4mm;
the length C9 of the fourth high-pass open stub 36 is 60mm, and the width K9 of the fourth high-pass open stub 36 is 4.2mm;
the length C10 of the high-pass short-circuit branch 37 is 31mm, and the width K10 of the high-pass short-circuit branch 37 is 0.8mm.
For convenience of production, as shown in fig. 1, 2 and 3, the first low-pass open-circuit branch 23, the second low-pass open-circuit branch 24, the third low-pass open-circuit branch 25, the low-pass short-circuit branch 26 and the fourth low-pass open-circuit branch 210 of the low-pass filter 2 are linear structures; the first high-pass open-circuit branch 33, the second high-pass open-circuit branch 34, the third high-pass open-circuit branch 35, the fourth high-pass open-circuit branch 36, and the high-pass short-circuit branch 37 of the high-pass filter 3 are also linear structures.
In order to reduce the production cost, the out-of-band rejection enhancement type combiner is easier to produce, and as shown in fig. 1, the out-of-band rejection enhancement type combiner further comprises a PCB board 4, wherein the high-pass filter 3, the low-pass filter 2 and the combiner 1 are formed on one side of the PCB board 4 in a copper-clad manner.
Fig. 4 is a diagram of simulation test results of the present embodiment, db (S (1, 1)) in fig. 4 refers to the return loss of the combining end 1, db (S (2, 1)) refers to the transmission coefficient from the combining end 1 to the high-pass splitting end 32, and db (S (3, 1)) refers to the transmission coefficient from the combining end 1 to the low-pass splitting end 22. From fig. 4, it follows that: in the present embodiment, db (S (1, 1)) and db (S (2, 1)) are lower and db (S (3, 1)) is higher in the interval of passband frequencies of 1710MHz to 1830 MHz; in the interval db (S (2, 1)) of 1830MHz-1885MHz, db (S (1, 1)) rises rapidly, db (S (3, 1)) rises first and then falls, db (S (3, 1)) falls rapidly; in the interval 1885MHz-2025MHz, db (S (1, 1)), db (S (3, 1)) is lower, db (S (2, 1)) is higher, so that the combiner of the embodiment can be known to have good performance in two intervals of passband frequency 1710MHz-1830MHz and passband frequency 1885MHz-2025MHz, has fast stopband drop and high out-of-band suppression, and is suitable for processing radio frequency signals with two frequency ranges close to each other.
Example 2
This embodiment differs from embodiment 1 in that: as shown in fig. 5, the low-pass filter 2 formed on the PCB board 4 of the present embodiment has no fourth circuit stub, and there is also a difference in the size of the circuit. The method comprises the following steps:
as shown in fig. 5, the length of the first low-pass transmission section 27 of the low-pass transmission main line 21 is 40.2mm, and the width of the first low-pass transmission section 27 is 5.7mm; the length of the second low-pass transmission section 28 is 284.8mm and the width of the second low-pass transmission section 28 is 3mm; the length of the third low-pass transmission section 29 is 38mm and the width of the third low-pass transmission section 29 is in the range of 5.7; the length of the first low-pass open stub 23 is 65.8, and the width of the first low-pass open stub 23 is 7.1mm; the length of the second low-pass open stub 24 is 53mm and the width of the second low-pass open stub 24 is 4.6mm; the length of the third low-pass open branch 25 is 65.8mm, and the width of the third low-pass open branch 25 is 7.1mm; the length of the low-pass short-circuit branch 26 is 38mm and the width of the low-pass short-circuit branch 26 is 5.7mm.
As shown in fig. 5, the length of the first high-pass transmission section 38 of the high-pass transmission main line 31 of the high-pass filter 3 is 9.1mm, and the width of the first high-pass transmission section 38 is 0.8mm; the length of the second high-pass transmission section 39 is 92.3mm, and the width of the second high-pass transmission section 39 is 2.7mm; the length of the third high-pass transmission section 310 is 147.3mm, and the width of the third high-pass transmission section 310 is 2.9mm; the length of the fourth high-pass transmission section 320 is 6.8mm, and the width of the fourth high-pass transmission section 320 is 2.3mm; the length of the first high-pass open branch 33 is 96mm, and the width of the first high-pass open branch 33 is 3mm; the length of the first segment 341 of the second high-pass open stub 34 is 46mm, and the width of the first segment 341 is 3.1mm; the length of the second section 342 is 90.6mm and the width of the second section 342 is 18mm; the length of the third high-pass open branch 35 is 83.2mm, and the width of the third high-pass open branch 35 is 2.4mm; the length of the fourth high-pass open stub 36 is 59.7mm, and the width of the fourth high-pass open stub 36 is 5.6mm; the length of the high-pass short-circuit branch 37 is 33.2mm, and the width of the high-pass short-circuit branch 37 is 0.8mm.
Fig. 6 is a diagram of simulation test results of the present embodiment, db (S (1, 1)) in fig. 6 refers to the return loss of the combining end 1, db (S (2, 1)) refers to the transmission coefficient from the combining end 1 to the high-pass splitting end 32, and db (S (3, 1)) refers to the transmission coefficient from the combining end 1 to the low-pass splitting end 22. From fig. 6, it follows that: in the present embodiment, db (S (1, 1)) and db (S (2, 1)) are lower and db (S (3, 1)) is higher in the interval of passband frequencies of 1710MHz to 1830 MHz; in the interval db (S (2, 1)) of 1830MHz-1885MHz, db (S (1, 1)) rises rapidly, db (S (3, 1)) rises first and then falls, db (S (3, 1)) falls rapidly; in the interval 1885MHz-2025MHz, db (S (1, 1)), db (S (3, 1)) is lower, db (S (2, 1)) is higher, so that the combiner of the embodiment can be known to have good performance in two intervals of passband frequency 1710MHz-1830MHz and passband frequency 1885MHz-2025MHz, has fast stopband drop and high out-of-band suppression, and is suitable for processing radio frequency signals with two frequency ranges close to each other.
Example 3
This embodiment differs from embodiment 2 in that: as shown in fig. 7, the first low-pass open-circuit branch 23, the second low-pass open-circuit branch 24, and the third low-pass open-circuit branch 25 of the low-pass filter 2 formed on the PCB board 4 are of a curved structure; the first high-pass open branch 33, the second high-pass open branch 34, the third high-pass open branch 35 and the high-pass short branch 37 of the high-pass filter 3 are also curved structures, so that the structural layout is more compact than that of the embodiment 2, and the whole volume of the product can be made smaller. The dimensions of the circuit in this embodiment are also different from those of embodiment 2, and are as follows:
as shown in fig. 7, the length of the first low-pass transmission section 27 of the low-pass transmission main line 21 is 35mm, and the width of the first low-pass transmission section 27 is 9.4mm; the length of the second low-pass transmission section 28 is 277.2mm, and the width of the second low-pass transmission section 28 is 8.2mm; the length of the third low-pass transmission section 29 is 33.6mm and the width of the third low-pass transmission section 29 is in the range of 6.5; the length of the first low-pass open stub 23 is 72.1, and the width of the first low-pass open stub 23 is 9.1mm; the length of the second low-pass open stub 24 is 62.6mm, and the width of the second low-pass open stub 24 is 3.6mm; the length of the third low-pass open branch 25 is 63.3mm, and the width of the third low-pass open branch 25 is 6.1mm; the length of the low-pass short-circuit branch 26 is 37.7mm, and the width of the low-pass short-circuit branch 26 is 4.9mm.
As shown in fig. 7, the length of the first high-pass transmission section 38 of the high-pass transmission main line 31 of the high-pass filter 3 is 7.9mm, and the width of the first high-pass transmission section 38 is 0.8mm; the length of the second high-pass transmission section 39 is 92.3mm, and the width of the second high-pass transmission section 39 is 2.7mm; the length of the third high-pass transmission section 310 is 107.2mm, and the width of the third high-pass transmission section 310 is 1mm; the length of the fourth high-pass transmission section 320 is 7mm, and the width of the fourth high-pass transmission section 320 is 2.4mm; the length of the first high-pass open branch 33 is 104.7mm, and the width of the first high-pass open branch 33 is 3mm; the length of the first segment 341 of the second high-pass open stub 34 is 42.6mm, and the width of the first segment 341 is 1.7mm; the length of the second section 342 is 95.5mm and the width of the second section 342 is 10.7mm; the length of the third high-pass open branch 35 is 90.6mm, and the width of the third high-pass open branch 35 is 1.9mm; the length of the fourth high-pass open stub 36 is 50.6mm, and the width of the fourth high-pass open stub 36 is 3mm; the length of the high-pass short-circuit branch 37 is 30.3mm, and the width of the high-pass short-circuit branch 37 is 0.8mm.
Fig. 8 is a diagram of simulation test results of the present embodiment, db (S (1, 1)) in fig. 8 refers to the return loss of the combining end 1, db (S (2, 1)) refers to the transmission coefficient from the combining end 1 to the high-pass splitting end 32, and db (S (3, 1)) refers to the transmission coefficient from the combining end 1 to the low-pass splitting end 22. From fig. 8, it follows that: in the present embodiment, db (S (1, 1)) and db (S (2, 1)) are lower and db (S (3, 1)) is higher in the interval of passband frequencies of 1710MHz to 1830 MHz; in the interval db (S (2, 1)) of 1830MHz-1885MHz, db (S (1, 1)) rises rapidly, db (S (3, 1)) rises first and then falls, db (S (3, 1)) falls rapidly; in the interval 1885MHz-2025MHz, db (S (1, 1)), db (S (3, 1)) is lower, db (S (2, 1)) is higher, so that the combiner of the embodiment can be known to have good performance in two intervals of passband frequency 1710MHz-1830MHz and passband frequency 1885MHz-2025MHz, has fast stopband drop and high out-of-band suppression, and is suitable for processing radio frequency signals with two frequency ranges close to each other.
Claims (10)
1. An out-of-band rejection enhancement combiner comprises a combiner, a low-pass filter and a high-pass filter; the method is characterized in that: the low-pass filter comprises a low-pass transmission main line, a low-pass branching end, a first low-pass open-circuit branch knot, a second low-pass open-circuit branch knot, a third low-pass open-circuit branch knot and a low-pass short-circuit branch knot; wherein:
one end of the low-pass transmission main line is communicated with the combining end, and the other end of the low-pass transmission main line is communicated with the low-pass branching end;
one end of each of the first low-pass open-circuit branch knot, the second low-pass open-circuit branch knot and the third low-pass open-circuit branch knot is intersected with and communicated with the low-pass transmission main line;
the conduction intersection of the first low-pass open branch knot and the low-pass transmission main line is A1, the conduction intersection of the second low-pass open branch knot and the low-pass transmission main line is A2, the conduction intersection of the third low-pass open branch knot and the low-pass transmission main line is A3, and the conduction intersection A1, the conduction intersection A2 and the conduction intersection A3 are sequentially arranged on the low-pass transmission main line along the direction from the combining end to the low-pass splitting end;
one end of the low-pass short circuit branch is conducted with the conduction intersection A1, and the other end of the low-pass short circuit branch is conducted with the conduction intersection A3;
the high-pass filter comprises a high-pass transmission main line, a high-pass branching end, a first high-pass open-circuit branch knot, a second high-pass open-circuit branch knot, a third high-pass open-circuit branch knot, a fourth high-pass open-circuit branch knot and a high-pass short-circuit branch knot; wherein:
one end of the high-pass transmission main line is communicated with the combining end, and the other end of the high-pass transmission main line is communicated with the high-pass branching end;
one end of each of the first high-pass open-circuit branch knot, the second high-pass open-circuit branch knot, the third high-pass open-circuit branch knot and the fourth high-pass open-circuit branch knot is intersected with the high-pass transmission main line and is communicated;
the conduction intersection of the first high-pass open branch knot and the high-pass transmission main line is B1, the conduction intersection of the second high-pass open branch knot and the high-pass transmission main line is B2, the conduction intersection of the third high-pass open branch knot and the high-pass transmission main line is B3, the conduction intersection of the fourth high-pass open branch knot and the high-pass transmission main line is B4, and the conduction intersection B1, the conduction intersection B2, the conduction intersection B3 and the conduction intersection B4 are sequentially arranged on the high-pass transmission main line along the direction from the combining end to the high-pass branch end;
one end of the high-pass short-circuit branch is conducted with the conducting intersection B2, and the other end of the high-pass short-circuit branch is conducted with the conducting intersection B4.
2. The out-of-band rejection-enhanced combiner of claim 1, wherein: the conduction intersection A1 on the low-pass transmission main line is close to the combining end, and the conduction intersection A3 on the low-pass transmission main line is close to the low-pass branching end; the conducting intersection B4 on the high-pass transmission main line is positioned at the end of the high-pass transmission main line connected with the high-pass branching end.
3. The out-of-band rejection-enhanced combiner of claim 1, wherein: the low-pass filter further comprises a fourth low-pass open branch, one end of the fourth low-pass open branch is intersected with the low-pass transmission main line and is conducted, the conducting intersection of the fourth low-pass open branch and the low-pass transmission main line is A4, and the conducting intersection A4 of the low-pass transmission main line is located between the low-pass branch end and the conducting intersection A3.
4. The out-of-band rejection-enhanced combiner of claim 1, wherein: the difference between the lower limit of the passband frequency of the high pass filter and the upper limit of the passband frequency of the low pass filter is in the range of 50MHz to 80 MHz.
5. An out-of-band rejection-enhanced combiner according to claim 1 or 2 or 3 or 4, wherein: the passband frequencies of the low-pass filter and the high-pass filter are all in the range of 600 MHz-2500 MHz.
6. The out-of-band rejection-enhanced combiner of claim 1, wherein: the part from the end of the low-pass transmission main line, which is communicated with the combining end, to the communicating intersection A1 is a first low-pass transmission section, the length L1 of the first low-pass transmission section is in the range of 30 mm-45 mm, and the width W1 of the first low-pass transmission section is in the range of 4 mm-10 mm;
the part from the conduction intersection A1 to the conduction intersection A3 on the low-pass transmission main line is a second low-pass transmission section, the second low-pass transmission section is intersected with one end of a second low-pass open-circuit branch at the midpoint of the length direction and is conducted, the length L2 of the second low-pass transmission section is in the range of 270 mm-290 mm, and the width W2 of the second low-pass transmission section is in the range of 1.5 mm-10 mm;
the part from the end connected with the low-pass branching end to the conduction intersection A3 on the low-pass transmission main line is a third low-pass transmission section, the length L3 of the third low-pass transmission section is in the range of 30 mm-45 mm, and the width W3 of the third low-pass transmission section is in the range of 3 mm-8 mm;
the length L4 of the first low-pass open branch is in the range of 60-80 mm, and the width W4 of the first low-pass open branch is in the range of 4-10 mm;
the length L5 of the second low-pass open branch is in the range of 45-70 mm, and the width W5 of the second low-pass open branch is in the range of 0.8-5 mm;
the length L6 of the third low-pass open branch is in the range of 15 mm-80 mm, and the width W6 of the third low-pass open branch is in the range of 1 mm-8 mm;
the length L7 of the low-pass short circuit branch is in the range of 25-40 mm, and the width W7 of the low-pass short circuit branch is in the range of 4-10 mm.
7. The out-of-band rejection-enhanced combiner of claim 6, wherein: the low-pass filter further comprises a fourth low-pass open-circuit branch, one end of the fourth low-pass open-circuit branch is intersected with the third low-pass transmission section and is communicated, the length L8 of the fourth low-pass open-circuit branch is in the range of 60 mm-70 mm, and the width W8 of the fourth low-pass open-circuit branch is in the range of 2.5 mm-3.5 mm; the conducting intersection of the fourth low-pass open branch and the third low-pass transmission section is A4; the distance D1 from the conducting intersection A4 to the conducting intersection A3 is in the range of 15 mm-20 mm, and the width W9 of the section from the conducting intersection A4 to the conducting intersection A3 on the third low-pass transmission section is in the range of 3 mm-3.5 mm; the distance D2 from the conduction intersection A4 to the low-pass branching end is in the range of 10 mm-15 mm, and the width W10 of the section from the conduction intersection A4 to the low-pass branching end on the third low-pass transmission section is in the range of 3.5 mm-4 mm.
8. An out-of-band rejection-enhanced combiner as in claim 6 or 7 wherein: the part from the end of the high-pass transmission main line, which is communicated with the combining end, to the communicated intersection B1 is a first high-pass transmission section, the length C1 of the first high-pass transmission section is in the range of 6 mm-12 mm, and the width K1 of the first high-pass transmission section is in the range of 0.6 mm-1.5 mm;
the part from the conduction intersection B1 to the conduction intersection B2 on the high-pass transmission main line is a second high-pass transmission section, the length C2 of the second high-pass transmission section is in the range of 85 mm-95 mm, and the width K2 of the second high-pass transmission section is in the range of 2 mm-3 mm;
the part from the conduction intersection B2 to the conduction intersection B3 on the high-pass transmission main line is a third high-pass transmission section, the length C3 of the third high-pass transmission section is in the range of 100 mm-160 mm, and the width K3 of the third high-pass transmission section is in the range of 0.8 mm-3.5 mm;
the part from the conduction intersection B3 to the conduction intersection B4 on the high-pass transmission main line is a fourth high-pass transmission section, the length C4 of the fourth high-pass transmission section is in the range of 2.5 mm-8.5 mm, and the width K4 of the fourth high-pass transmission section is in the range of 2 mm-3.5 mm;
the high-pass transmission main line is conducted with a high-pass branching end at a conduction intersection B4;
the length C5 of the first high-pass open branch is in the range of 90-110 mm, and the width K5 of the first high-pass open branch is in the range of 2.5-4.5 mm;
the second high-pass open branch comprises a first section and a second section, one end of the first section is intersected with the high-pass transmission main line and is communicated with the high-pass transmission main line, and the other end of the first section is communicated with one end of the second section; the length C6 of the first section is in the range of 40 mm-50 mm, and the width K6 of the first section is in the range of 1 mm-4 mm; the length C7 of the second section is in the range of 85 mm-100 mm, and the width K7 of the second section is in the range of 10 mm-20 mm;
the length C8 of the third high-pass open branch is in the range of 75-95 mm, and the width K8 of the third high-pass open branch is in the range of 1.5-4 mm;
the length C9 of the fourth high-pass open branch is in the range of 45 mm-65 mm, and the width K9 of the fourth high-pass open branch is in the range of 2.5 mm-6 mm;
the length C10 of the high-pass short-circuit branch is in the range of 25 mm-35 mm, and the width K10 of the high-pass short-circuit branch is in the range of 0.6 mm-1.2 mm.
9. The out-of-band rejection-enhanced combiner of claim 1, wherein: the first low-pass open-circuit branch, the second low-pass open-circuit branch, the third low-pass open-circuit branch and the low-pass short-circuit branch of the low-pass filter are of linear or bent structures; the first high-pass open-circuit branch, the second high-pass open-circuit branch, the third high-pass open-circuit branch, the fourth high-pass open-circuit branch and the high-pass short-circuit branch of the high-pass filter are of a linear type or a bent type structure.
10. The out-of-band rejection-enhanced combiner of claim 1, wherein: the high-pass filter, the low-pass filter and the combining end are formed on one surface of the PCB in a copper-clad mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310997028.6A CN116995386B (en) | 2023-08-09 | 2023-08-09 | Out-of-band suppression enhanced combiner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310997028.6A CN116995386B (en) | 2023-08-09 | 2023-08-09 | Out-of-band suppression enhanced combiner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116995386A true CN116995386A (en) | 2023-11-03 |
| CN116995386B CN116995386B (en) | 2024-02-23 |
Family
ID=88533675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310997028.6A Active CN116995386B (en) | 2023-08-09 | 2023-08-09 | Out-of-band suppression enhanced combiner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116995386B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442330A (en) * | 1993-12-27 | 1995-08-15 | Motorola, Inc. | Coupled line filter with improved out-of-band rejection |
| CN106450600A (en) * | 2016-07-31 | 2017-02-22 | 华南理工大学 | Sideband steep plane duplexer based on band-pass band-elimination hybrid structure |
| CN107732399A (en) * | 2017-10-25 | 2018-02-23 | 上海安费诺永亿通讯电子有限公司 | A kind of frequency four-port microstrip combiner of ultra wide band three for mobile radio system |
| KR102244144B1 (en) * | 2020-01-21 | 2021-04-22 | 광운대학교 산학협력단 | Compact Multi-Band Power Divider With Zero-Degree Composite Right-/Left-Hand Transmission Lines |
| CN112864555A (en) * | 2021-01-25 | 2021-05-28 | 南通大学 | Suspension strip line cavity combiner with uniform impedance branch loading |
| CN112909464A (en) * | 2021-01-25 | 2021-06-04 | 中天通信技术有限公司 | Microstrip combiner with uniform impedance branch loading |
| CN213782232U (en) * | 2020-10-30 | 2021-07-23 | 广东鸿展通信技术有限公司 | Annular combiner |
-
2023
- 2023-08-09 CN CN202310997028.6A patent/CN116995386B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442330A (en) * | 1993-12-27 | 1995-08-15 | Motorola, Inc. | Coupled line filter with improved out-of-band rejection |
| CN106450600A (en) * | 2016-07-31 | 2017-02-22 | 华南理工大学 | Sideband steep plane duplexer based on band-pass band-elimination hybrid structure |
| CN107732399A (en) * | 2017-10-25 | 2018-02-23 | 上海安费诺永亿通讯电子有限公司 | A kind of frequency four-port microstrip combiner of ultra wide band three for mobile radio system |
| KR102244144B1 (en) * | 2020-01-21 | 2021-04-22 | 광운대학교 산학협력단 | Compact Multi-Band Power Divider With Zero-Degree Composite Right-/Left-Hand Transmission Lines |
| CN213782232U (en) * | 2020-10-30 | 2021-07-23 | 广东鸿展通信技术有限公司 | Annular combiner |
| CN112864555A (en) * | 2021-01-25 | 2021-05-28 | 南通大学 | Suspension strip line cavity combiner with uniform impedance branch loading |
| CN112909464A (en) * | 2021-01-25 | 2021-06-04 | 中天通信技术有限公司 | Microstrip combiner with uniform impedance branch loading |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116995386B (en) | 2024-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105591183B (en) | Reverse phase based on parallel coupling structure not decile power splitter | |
| CN104091982B (en) | A kind of ultra broadband band elimination filter loaded based on many step impedance resonator | |
| CN101958442B (en) | Microwave three-frequency band-pass filter based on wedged SIR (Signal to Interference Ratio) structure | |
| CN104577268A (en) | Planar lowpass-bandpass triplexer | |
| CN106384864B (en) | LTCC balanced band-pass filter based on multi-frequency coupling | |
| EP0978895A2 (en) | Dual band combiner arrangement | |
| CN110247147B (en) | Microstrip band-pass power divider | |
| CN116995386B (en) | Out-of-band suppression enhanced combiner | |
| CN105489980A (en) | High-isolation low-pass and band-pass triplexer | |
| CN204375881U (en) | Plane lower passband leads to triplexer | |
| US7538639B2 (en) | Low-pass filter | |
| CN209515949U (en) | A kind of plane bandpass filter based on parallel coupled line | |
| CN112271422A (en) | Microstrip line filter | |
| CN109585993A (en) | Power processing circuit and multichannel Power processing circuit | |
| CN101692512A (en) | Ultra wide band bandpass filter based on ground defective grounding structure | |
| CN101540426B (en) | Low pass filter | |
| CN205621822U (en) | High isolation low pass band -pass triplexer | |
| CN112670728B (en) | High-speed interconnection structure | |
| CN207517832U (en) | A kind of plane triplexer based on minor matters loading structure | |
| CN113131112A (en) | Miniaturized band-pass LTCC filter with embedded SIR branches | |
| CN108736117B (en) | Millimeter wave band-pass filter with ultra-wide stop band | |
| CN102255125A (en) | Novel double-frequency narrow-band bandpass filter | |
| CN205194819U (en) | Stripline band pass filter with high out -band inhibition performance | |
| CN1335674A (en) | On-chip signal filter with bonded lead inductance | |
| CN107834135A (en) | A kind of plane triplexer based on minor matters loading structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |