CN117497986A - Three-way filtering power divider - Google Patents
Three-way filtering power divider Download PDFInfo
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- CN117497986A CN117497986A CN202311671041.9A CN202311671041A CN117497986A CN 117497986 A CN117497986 A CN 117497986A CN 202311671041 A CN202311671041 A CN 202311671041A CN 117497986 A CN117497986 A CN 117497986A
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- 238000001914 filtration Methods 0.000 title claims abstract description 27
- 230000005540 biological transmission Effects 0.000 claims abstract description 155
- 230000001629 suppression Effects 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims description 12
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 8
- 238000005259 measurement Methods 0.000 description 9
- 238000004088 simulation Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000002955 isolation Methods 0.000 description 6
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 230000005764 inhibitory process Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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Abstract
The invention discloses a three-way filtering power divider, which comprises a lower signal input layer, a middle metal grounding layer and an upper signal distribution layer which are sequentially arranged from bottom to top; the lower signal input layer is used for transmitting radio frequency signals at the input port through the microstrip transmission structure; the middle metal grounding layer is used for realizing feeding of the lower layer to the upper layer; the upper signal distribution layer comprises three output annular microstrip lines and three output ports which are arranged in a folding mode, and the output annular microstrip lines and the three output ports are used for dividing an input signal into three paths of constant-amplitude signals to be output and are subjected to harmonic suppression and filtering characteristics. The invention can realize the secondary third harmonic suppression characteristic, obviously reduce the circuit size through folding wiring, and realize the impedance matching of the input port by utilizing a quarter-wavelength structure.
Description
Technical Field
The invention relates to the field of radio frequency passive devices, in particular to a three-way filtering power divider.
Background
The power divider is a device for dividing a microwave signal input in a single way into multiple paths of outputs and is widely applied to multichannel analog beam forming of a phased array radar and a feed network of the phased array antenna. The birth of the three-way power divider is not 2 N The phased array radar design of the signal channels provides a new thought, and the power divider integrating the harmonic suppression and filtering functions ensures that a local oscillator power division network at the front end of the frequency mixing does not need to be cascaded with an additional filtering circuit, thereby being beneficial to realizing the simplification of the number of the receiving and transmitting channels and the miniaturization of an array frequency conversion system.
Along with the continuous development of modern wireless technology, active phased array radar is increasingly widely applied in heavy-point fields such as airborne, missile-borne, satellite-borne and the like, and a power division network for receiving and transmitting feed is taken as an indispensable component part in a phased array system, so that the transmission performance and the phase consistency of an output end have a vital influence on the multi-beam search precision and the micro-target detection performance of the radar. In order to meet the multifunctional and integrated demands of the new generation of radio frequency front-end systems, power division networks are developing towards the directions of function fusion, miniaturization and the like. Therefore, the miniaturized three-way power divider with harmonic suppression and filtering characteristics has important research value.
The Luzzatto power divider is an existing three-way plane power divider, and has different design principles and structures from a one-to-two Wilkinson power divider. As shown in fig. 1, the classical Luzzatto power divider has a three-layer structure, including an input port, three output ports, three quarter-wavelength microstrip lines, three isolation resistors, and three half-wavelength microstrip lines. However, the Luzzatto power divider occupies a large area and has no harmonic suppression function. On the basis, in order to realize harmonic suppression or filtering characteristics, the external cascaded filter brings more insertion loss and larger circuit area.
Disclosure of Invention
The invention aims to: the invention aims to provide a three-way filtering power divider, and an implementation circuit has a secondary third harmonic suppression characteristic.
The technical scheme is as follows: the three-way filtering power divider comprises a lower signal input layer, a middle metal grounding layer and an upper signal distribution layer which are sequentially arranged from bottom to top; wherein,
the lower signal input layer is used for transmitting radio frequency signals at the input port through the microstrip transmission structure;
the middle metal grounding layer is used for realizing feeding of the lower layer to the upper layer;
the upper signal distribution layer comprises three output annular microstrip lines and three output ports which are arranged in a folding mode, and the output annular microstrip lines and the three output ports are used for dividing an input signal into three paths of constant-amplitude signals to be output and are subjected to harmonic suppression and filtering characteristics.
Further, the lower signal input layer comprises a first feed circle, a microstrip transmission structure, a first medium substrate and an input port, wherein the input port, the first feed circle and the microstrip transmission structure are arranged on the first medium substrate; the microstrip transmission structure comprises an input microstrip line, a quarter-wavelength transmission line and an input transmission line which are sequentially connected, and the first feed circle is connected with the input transmission line.
Further, the middle metal stratum comprises a through hole, and the center of the through hole is located right above the center of the first feed circle.
Further, the upper signal distribution layer comprises three identical output microstrip lines with circular symmetry at the center of the circle, and each output microstrip line structure comprises a serpentine transmission line and two identical folding transmission lines; chip resistors are respectively arranged between two adjacent output microstrip line structures.
Further, the upper signal distribution layer comprises a second feed circle, a first output port, a second output port, a third output port, a first output microstrip line structure, a second output microstrip line structure, a third output microstrip line structure, a first chip resistor, a second chip resistor and a third chip resistor which are arranged on the second dielectric substrate; the center of the second feed circle is positioned right above the center of the first feed circle;
the first output microstrip line structure comprises a first transmission line, a sixth transmission line and a seventh transmission line, and the first output port is respectively connected with the first transmission line, the sixth transmission line and the seventh transmission line; the second output microstrip line structure comprises a second transmission line, a third transmission line and an eighth transmission line, and the second output port is respectively connected with the second transmission line, the third transmission line and the eighth transmission line; the third output microstrip line structure comprises a fourth transmission line, a fifth transmission line and a ninth transmission line, and the third output port is respectively connected with the fourth transmission line, the fifth transmission line and the ninth transmission line;
the first chip resistor is respectively connected with the first transmission line and the second transmission line, the second chip resistor is respectively connected with the third transmission line and the fourth transmission line, and the third chip resistor is respectively connected with the fifth transmission line and the sixth transmission line;
the seventh transmission line, the eighth transmission line and the ninth transmission line are respectively snake-shaped transmission lines, and the first transmission line, the second transmission line, the third transmission line, the fourth transmission line, the fifth transmission line, the sixth transmission line, the seventh transmission line and the eighth transmission line are respectively folding transmission lines.
Further, the serpentine transmission line is of a double-frequency point inhibition structure with two groups of open-circuit branches connected in parallel, wherein the first open-circuit branch is of a U-shaped structure, and the second open-circuit branch is of an S-shaped structure; by adjusting the number and size of open circuit stubs, the area of the overall structure and its harmonic rejection characteristics are changed.
Further, the electrical lengths of the first open circuit branch and the second open circuit branch are respectively 45 degrees and 30 degrees, and the second harmonic suppression characteristic and the third harmonic suppression characteristic are respectively corresponding.
Further, the three chip resistors have the same resistance.
Further, the electrical length of the folded transmission line is taken to be 180 °.
Compared with the prior art, the invention has the following remarkable effects:
1. in the invention, for the upper structure, the snake-shaped transmission line is designed into a double-frequency point inhibition structure of two groups of open-circuit branches in parallel, so that the longitudinal length between a circle center feed port and each output port is reduced to 1/2 of the length of a conventional quarter-wavelength transmission line, and the annular area is reduced to 1/4 of the original Luzzatto power divider, thus the circuit has the secondary third harmonic inhibition characteristic;
2. part of the folding transmission line is folded into the annular area, so that the circuit structure is more compact, and the circuit area is greatly reduced;
3. the invention is based on the improvement of the Luzzatto power distributor, the matching of each port is good, the out-of-band inhibition level and isolation are excellent, and the circuit performance is still kept at a good level;
4. the invention has smaller whole circuit size and is convenient for integration.
Drawings
FIG. 1 is a schematic diagram of a Luzzatto power divider according to the present invention;
FIG. 2 is a schematic diagram of the structure of the present invention;
FIG. 3 is a schematic diagram of the lower signal input layer structure of the present invention;
FIG. 4 is a schematic diagram of an intermediate metal formation structure according to the present invention;
FIG. 5 is a schematic diagram of an upper signal layer according to the present invention;
FIG. 6 is a graph of simulation versus actual measurement of insertion loss according to the present invention;
FIG. 7 is a graph showing the comparison of simulation and actual measurement of the isolation between the return loss and the output port of each port according to the present invention;
fig. 8 is a comparison of phase inconsistency simulation and actual measurement according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Structural design
As shown in fig. 2, the three-way filtering power divider of the present invention comprises a lower signal input layer 1, an intermediate metal ground layer 2 and an upper signal distribution layer 3 which are sequentially arranged from bottom to top; wherein, the lower signal input layer 1 is used for making the radio frequency signal at the input port enter the power divider through the microstrip transmission structure, and the lower signal input layer comprises an input port 50 and the microstrip transmission structure; the center of the middle metal grounding layer 2 comprises a metalized through hole for realizing feeding of the lower layer to the upper layer; the upper signal distribution layer 3 is used for dividing an input signal into three paths of constant-amplitude signals to be output and applying harmonic suppression and filtering characteristics, and comprises three output annular microstrip lines and three output ports of the folding wiring.
The microstrip transmission structure of the lower signal input layer 1 for signal input comprises two transmission lines with different impedances and a section of folded quarter-wavelength matching line; as shown in fig. 3, the lower signal input layer 1 includes a first dielectric substrate 6, a first feeding circle 4, and a microstrip transmission structure 5, where the first feeding circle 4 and the microstrip transmission structure 5 are disposed on the first dielectric substrate 6; the microstrip transmission structure 5 comprises an input microstrip line 5-1, a quarter-wavelength transmission line 5-2 and an input transmission line 5-3 which are sequentially connected, and the first feed circle 4 is connected with the input transmission line 5-3.
As shown in fig. 4, the intermediate metal layer 2 includes a through hole 7, and the center of the through hole 7 is located directly above the center of the first feeding circle 4.
The upper signal distribution layer 3 comprises three identical output microstrip line structures which are circularly symmetrical about the center of the upper layer. Specifically, each output microstrip line structure comprises a serpentine transmission line and two identical folded transmission lines; and patch resistors are respectively arranged between two adjacent output microstrip line structures, and have the same resistance. As shown in fig. 5, the upper signal distribution layer 3 includes a second feeding circle 23, a first output port 8, a second output port 9, a third output port 10, a first output microstrip line structure, a second output microstrip line structure, a third output microstrip line structure, a first chip resistor 20, a second chip resistor 21, and a third chip resistor 22, which are disposed on a second dielectric substrate 24, and the center of the second feeding circle 23 is located directly above the through hole 7. The first output microstrip line structure comprises a first transmission line 11, a sixth transmission line 16 and a seventh transmission line 17, and the first output port 8 is respectively connected with the first transmission line 11, the sixth transmission line 16 and the seventh transmission line 17; the second output microstrip line structure comprises a second transmission line 12, a third transmission line 13 and an eighth transmission line 18, and the second output port 9 is respectively connected with the second transmission line 12, the third transmission line 13 and the eighth transmission line 18; the third output microstrip line structure includes a fourth transmission line 14, a fifth transmission line 15, and a ninth transmission line 19, and the third output port 10 is connected to the fourth transmission line 14, the fifth transmission line 15, and the ninth transmission line 19, respectively. The first chip resistor 20 is connected to the first transmission line 11 and the second transmission line 12, the second chip resistor 21 is connected to the third transmission line 13 and the fourth transmission line 14, and the third chip resistor 22 is connected to the fifth transmission line 15 and the sixth transmission line 16. The seventh transmission line 17, the eighth transmission line 18, and the ninth transmission line 19 are serpentine transmission lines, and the first transmission line 11, the second transmission line 12, the third transmission line 13, the fourth transmission line 14, the fifth transmission line 15, the sixth transmission line 16, the seventh transmission line 17, and the eighth transmission line 18 are folded transmission lines, respectively.
The serpentine transmission line is a double-frequency point suppression structure of two groups of parallel open-circuit branches, wherein the first open-circuit branch is of a U-shaped structure, and the second open-circuit branch is of an S-shaped structure, so that the longitudinal length between a circle center feed port and each output port is reduced to 1/2 of the length of the quarter-wavelength transmission line 5-2. The two sets of open-circuit branches connected in parallel are used for shortening the electric length of the transmission line and introducing a second third harmonic suppression point, and the area of the whole structure and the harmonic suppression characteristic thereof can be changed to a large extent by adjusting the number and the size of the open-circuit branches.
Preferably, the electrical lengths of the first open branch and the second open branch in the serpentine transmission line are respectively taken to be 45 degrees and 30 degrees, which respectively correspond to the second harmonic suppression characteristics and the third harmonic suppression characteristics.
Preferably, the folded transmission line has an electrical length of 180 °, a wide band-pass filter characteristic is achieved, and is folded into an annular arrangement, so that the structure is compact, and the circuit area is reduced.
In this embodiment, the first dielectric substrate 6 and the second dielectric substrate 24 are respectively RO4350 with a dielectric constant of 3.66 and a thickness of 0.508mm, and the microstrip line, the chip resistor and the intermediate metal ground layer on the dielectric substrate are all made of metal copper.
(II) simulation verification
In this embodiment, the electromagnetic simulation software HFSS is used to perform S-parameter simulation (including insertion loss and phase of the device from input port to output port, return loss of each input and output port, and isolation between each output port) on the miniaturized three-way filtering power divider with harmonic suppression characteristic, and test the processed device, where simulation and actual measurement results are shown in fig. 6-8.
Fig. 6-7 show simulation and actual measurement comparison diagrams of the insertion loss, return loss and isolation between output ports of the miniaturized three-way filtering power divider with harmonic suppression characteristics, and actual measurement results show that, within an operating frequency band of 2.1-2.9GHz, the insertion loss of a device from an input port 50 to each output port (i.e., from the input port 50 to the first output port 8, from the input port 50 to the second output port 9, and from the input port 50 to the third output port 10) is respectively S21, S31, S41 and better than 5.27dB (ideal value is-4.77 dB), the fractional bandwidth reaches 74.5%, the return loss S11, S22, S33, S44 of the input port 50 and each output port is better than 10dB, and the isolation between adjacent output ports (i.e., between the first output port 8 and the second output port 9, between the first output port 8 and the third output port 10, and between the second output port 9 and the third output port 10) is respectively S23, S24, S34 and S34 are respectively lower than 19.5dB, which indicates that the device has good bandpass performance and bandpass matching characteristics. Outside the passband frequency, the results of the measurements show that there is 32.8dB second harmonic rejection at the 4.77GHz frequency and 39.2dB third harmonic rejection at the 7.92GHz frequency. From another perspective, the power suppression level is always higher than 10.6dB in the frequency band centered around the second harmonic (5.0±1.25 GHz), while the power suppression level is maintained above 21.7dB in the frequency band centered around the third harmonic frequency (7.5±1.25 GHz).
Fig. 8 is a comparison between phase inconsistency simulation and actual measurement of the miniaturized three-way filtering power divider with harmonic suppression characteristics, and actual measurement results show that the degree of phase inconsistency between output ports is kept within 1.17 degrees, which means that the phase consistency between the output ports is very good.
Claims (9)
1. The three-way filtering power divider is characterized by comprising a lower signal input layer (1), an intermediate metal grounding layer (2) and an upper signal distribution layer (3) which are sequentially arranged from bottom to top; wherein,
the lower signal input layer (1) is used for transmitting radio frequency signals at the input port through the microstrip transmission structure;
an intermediate metal grounding layer (2) for realizing feeding of the lower layer to the upper layer;
the upper signal distribution layer (3) comprises three output annular microstrip lines and three output ports which are arranged in a folding way and are used for dividing an input signal into three paths of constant-amplitude signal output and applying harmonic suppression and filtering characteristics.
2. The three-way filtering power divider according to claim 1, wherein the lower signal input layer (1) comprises a first feed circle (4), a microstrip transmission structure (5), a first dielectric substrate (6) and an input port (50), and the input port (50), the first feed circle (4) and the microstrip transmission structure (5) are arranged on the first dielectric substrate (6); the microstrip transmission structure (5) comprises an input microstrip line (5-1), a quarter-wavelength transmission line (5-2) and an input transmission line (5-3) which are sequentially connected, and the first feed circle (4) is connected with the input transmission line (5-3).
3. A three-way filtering power divider according to claim 2, characterized in that the intermediate metal layer (2) comprises a through hole (7), the centre of the through hole (7) being located directly above the centre of the first feed circle (4).
4. The three-way filtering power divider according to claim 1, wherein the upper signal distribution layer (3) comprises three identical output microstrip lines with circular symmetry at the center, and each output microstrip line structure comprises a serpentine transmission line and two identical folding transmission lines; chip resistors are respectively arranged between two adjacent output microstrip line structures.
5. The three-way filtering power divider according to claim 4, wherein the upper signal distribution layer (3) comprises a second feeding circle (23), a first output port (8), a second output port (9), a third output port (10), a first output microstrip line structure, a second output microstrip line structure, a third output microstrip line structure, a first chip resistor (20), a second chip resistor (21) and a third chip resistor (22) which are arranged on a second dielectric substrate (24); the center of the second feed circle (23) is positioned right above the center of the first feed circle (4);
the first output microstrip line structure comprises a first transmission line (11), a sixth transmission line (16) and a seventh transmission line (17), and the first output port (8) is respectively connected with the first transmission line (11), the sixth transmission line (16) and the seventh transmission line (17); the second output microstrip line structure comprises a second transmission line (12), a third transmission line (13) and an eighth transmission line (18), and the second output port (9) is respectively connected with the second transmission line (12), the third transmission line (13) and the eighth transmission line (18); the third output microstrip line structure comprises a fourth transmission line (14), a fifth transmission line (15) and a ninth transmission line (19), and the third output port (10) is respectively connected with the fourth transmission line (14), the fifth transmission line (15) and the ninth transmission line (19);
the first chip resistor (20) is respectively connected with the first transmission line (11) and the second transmission line (12), the second chip resistor (21) is respectively connected with the third transmission line (13) and the fourth transmission line (14), and the third chip resistor (22) is respectively connected with the fifth transmission line (15) and the sixth transmission line (16);
the seventh transmission line (17), the eighth transmission line (18) and the ninth transmission line (19) are respectively snake-shaped transmission lines, and the first transmission line (11), the second transmission line (12), the third transmission line (13), the fourth transmission line (14), the fifth transmission line (15), the sixth transmission line (16), the seventh transmission line (17) and the eighth transmission line (18) are respectively folding transmission lines.
6. The three-way filtering power divider of claim 5, wherein the serpentine transmission line has a double-frequency point suppression structure with two sets of open-circuit branches connected in parallel, wherein a first open-circuit branch has a "U" structure and a second open-circuit branch has an "S" structure; by adjusting the number and size of open circuit stubs, the area of the overall structure and its harmonic rejection characteristics are changed.
7. The three-way filtering power divider of claim 6, wherein the electrical lengths of the first open branch and the second open branch are respectively taken to be 45 ° and 30 °, respectively, corresponding to second and third harmonic rejection characteristics.
8. The three-way filtering power divider of claim 5, wherein the three chip resistors have the same resistance.
9. The three-way filtering power divider of claim 5, wherein the folded transmission line has an electrical length of 180 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311671041.9A CN117497986A (en) | 2023-12-07 | 2023-12-07 | Three-way filtering power divider |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311671041.9A CN117497986A (en) | 2023-12-07 | 2023-12-07 | Three-way filtering power divider |
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