CN108767408B - Microminiaturized wilkinson power divider - Google Patents
Microminiaturized wilkinson power divider Download PDFInfo
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- CN108767408B CN108767408B CN201810838583.3A CN201810838583A CN108767408B CN 108767408 B CN108767408 B CN 108767408B CN 201810838583 A CN201810838583 A CN 201810838583A CN 108767408 B CN108767408 B CN 108767408B
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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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Abstract
A microminiaturized wilkinson power divider comprising: the device comprises a dielectric plate, a microstrip line, a hybrid transmission line, an isolation resistor and an isolation capacitor; the microstrip line comprises an input microstrip line, a first output microstrip line and a second output microstrip line; the hybrid transmission line comprises a first hybrid transmission line and a second hybrid transmission line; one end of the first mixed transmission line is connected with the input microstrip line, and the other end of the first mixed transmission line is connected with the first output microstrip line; one end of the second mixed transmission line is connected with the input microstrip line, and the other end of the second mixed transmission line is connected with the second output microstrip line; one end of the isolation resistor is connected with the second output microstrip line, the other end of the isolation resistor is connected with one end of the isolation capacitor, and the other end of the isolation capacitor is connected with the first output microstrip line. The invention adopts a novel hybrid transmission line structure to replace the traditional microstrip line with 90-degree electrical length. The total electrical length of the hybrid transmission line is only 9 degrees, which greatly reduces the size of the power divider.
Description
Technical Field
The invention relates to the field of power dividers, in particular to a microminiaturized wilkinson power divider.
Background
The wilkinson power divider is an indispensable passive device in a microwave receiving and transmitting system, and has the requirement for power distribution of signals and the like in a microwave communication system, a radar system, a remote control remote sensing system, an electronic reconnaissance system, an electronic countermeasure system and a microwave measurement system. The wilkinson power divider is widely applied to microwave power amplifiers, mixers, feed networks of antenna arrays, doherty amplifiers and other microwave systems because of its simple structure and easy processing and manufacturing. However, the conventional wilkinson power divider is formed by two transmission lines with a 90 ° electrical length, which results in that the conventional wilkinson power divider occupies a large circuit area, especially in a frequency band with a low frequency. The use of wilkinson power dividers is therefore greatly limited in applications where circuit size requirements are stringent, such as in hand held devices, on-board devices, etc. This makes it necessary to find a design method for a miniaturized power divider.
There are many methods for realizing miniaturization of the power divider at present, and the methods can be divided into several major categories: the method reduces the size of the power divider by 26% relative to the traditional Wilkinson power divider; the pi-type coupling microstrip line structure reduces the size of the power divider by 37% relative to the traditional Wilkinson power divider; the method reduces the size of the power divider by 26% relative to the traditional Wilkinson power divider; the high-low impedance resonant structure reduces the size of the power divider by 36.5% compared with the traditional Wilkinson power divider.
Although the above methods have reduced the size of the wilkinson power divider to some extent, the ratio of the size reduction is not sufficient for the VHF band of lower frequencies. There is also a need to find a more efficient way to achieve miniaturization of wilkinson power dividers.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a microminiaturized Wilkinson power divider, adopts a novel hybrid transmission line to replace the traditional transmission line, and greatly reduces the size of the power divider.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a microminiaturized wilkinson power divider comprising: the device comprises a dielectric plate, a microstrip line, a hybrid transmission line, an isolation resistor and an isolation capacitor; the microstrip line comprises an input microstrip line, a first output microstrip line and a second output microstrip line; the hybrid transmission line comprises a first hybrid transmission line and a second hybrid transmission line; one end of the first hybrid transmission line is connected with the input microstrip line, and the other end of the first hybrid transmission line is connected with the first output microstrip line; one end of the second mixed transmission line is connected with the input microstrip line, and the other end of the second mixed transmission line is connected with the second output microstrip line; one end of the isolation resistor is connected with the second output microstrip line, the other end of the isolation resistor is connected with one end of the isolation capacitor, and the other end of the isolation capacitor is connected with the first output microstrip line.
The first hybrid transmission line comprises a first serial microstrip line, a first parallel microstrip line, a second serial microstrip line, a second parallel microstrip line, a third serial microstrip line and a fourth serial microstrip line, and is composed of a first capacitor, a second capacitor and a first inductor;
the first series microstrip line, the second series microstrip line, the first inductor, the third series microstrip line and the fourth series microstrip line are sequentially connected in series; the first parallel microstrip line is connected in parallel with the joint of the first serial microstrip line and the second serial microstrip line, and the first capacitor is connected at the tail end of the first parallel microstrip line; the second parallel microstrip line is connected in parallel with the joint of the second serial microstrip line and the first inductor, and the second capacitor is connected at the tail end of the second parallel microstrip line.
The second hybrid transmission line comprises a fifth serial microstrip line, a third parallel microstrip line, a sixth serial microstrip line, a fourth parallel microstrip line, a seventh serial microstrip line, an eighth serial microstrip line, a third capacitor, a fourth capacitor and a second inductor;
the fifth series microstrip line, the sixth series microstrip line, the second inductor, the seventh series microstrip line and the eighth series microstrip line are sequentially connected in series; the third parallel microstrip line is connected in parallel with the joint of the fifth serial microstrip line and the sixth serial microstrip line, and the third capacitor is connected at the tail end of the third parallel microstrip line; the fourth parallel microstrip line is connected in parallel with the joint of the sixth serial microstrip line and the second inductor, and the fourth capacitor is connected at the tail end of the fourth parallel microstrip line.
The wilkinson power divider is a bisection power divider; in the first mixed transmission line and the second mixed transmission line, the corresponding microstrip lines have equal electrical lengths and same characteristic impedance; corresponding capacitance values are equal, and corresponding inductance values are equal; and the two mixed transmission lines are completely symmetrical, and the connection modes are the same.
The microstrip line is a 50Ω microstrip line.
Compared with the prior art, the invention has the beneficial effects that:
compared with the traditional wilkinson power divider, the microminiaturized wilkinson power divider adopts a hybrid transmission line with a novel structure. The total electrical length of the hybrid transmission line is only 9 degrees, which is far smaller than the traditional 90 degrees, the circuit area occupied by the microminiaturized Wilkinson power divider is only 10 percent of the area of the traditional Wilkinson power divider, and various performance indexes of the power divider are met.
Drawings
Fig. 1 is a schematic diagram of a subminiature wilkinson power divider according to embodiment 1 of the present invention.
FIG. 2 shows the S of the ultra-miniature Wilkinson power divider in example 1 of the present invention 11 And (5) simulating a result graph.
FIG. 3 is a diagram showing the S of a microminiaturized Wilkinson power divider in example 1 of the present invention 21 、S 31 And (5) simulating a result graph.
FIG. 4 shows the S of the ultra-miniature Wilkinson power divider of example 1 of the present invention 22 、S 33 And (5) simulating a result graph.
FIG. 5 shows the S of the ultra-miniature Wilkinson power divider in example 1 of the present invention 23 And (5) simulating a result graph.
In the figure: the multi-band microstrip line comprises a 1-dielectric plate, a 2-microstrip line, a 21-input microstrip line, a 22-first output microstrip line, a 23-second output microstrip line, a 3-mixed transmission line, a 31-first mixed transmission line, a 311-first serial microstrip line, a 312-first parallel microstrip line, a 313-second serial microstrip line, a 314-second parallel microstrip line, a 315-third serial microstrip line, a 316-fourth serial microstrip line, a 317-first capacitor, a 318-second capacitor, a 319-first inductor, a 32-second mixed transmission line, a 321-fifth serial microstrip line, a 322-third parallel microstrip line, a 323-sixth serial microstrip line, a 324-fourth parallel microstrip line, a 325-seventh serial microstrip line, a 326-eighth serial microstrip line, a 327-third capacitor, a 328-fourth capacitor, a 329-second inductor, a 4-isolation resistor and a 5-isolation capacitor.
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
referring to fig. 1, a subminiaturized wilkinson power divider, comprising: the micro-strip antenna comprises a dielectric plate 1, a micro-strip line 2, a hybrid transmission line 3, an isolation resistor 4 and an isolation capacitor 5; the microstrip line 2 comprises an input microstrip line 21, a first output microstrip line 22 and a second output microstrip line 23; the hybrid transmission line 3 includes a first hybrid transmission line 31, a second hybrid transmission line 32; one end of the first hybrid transmission line 31 is connected to the input microstrip line 21, and the other end of the first hybrid transmission line 31 is connected to the first output microstrip line 22; one end of the second hybrid transmission line 32 is connected to the input microstrip line 21, and the other end of the second hybrid transmission line 32 is connected to the second output microstrip line 23; one end of the isolation resistor 4 is connected with the second output microstrip line 23, the other end of the isolation resistor 4 is connected with one end of the isolation capacitor 5, and the other end of the isolation capacitor 5 is connected with the first output microstrip line 22.
The first hybrid transmission line 31 includes a first serial microstrip 311, a first parallel microstrip 312, a second serial microstrip 313, a second parallel microstrip 314, a third serial microstrip 315, a fourth serial microstrip 316, a first capacitor 317, a second capacitor 318, and a first inductor 319;
the first serial microstrip line 311, the second serial microstrip line 313, the first inductor 319, the third serial microstrip line 315 and the fourth serial microstrip line 316 are connected in series in sequence; the first parallel microstrip line 312 is connected in parallel to the junction of the first serial microstrip line 311 and the second serial microstrip line 313, and the first capacitor 317 is connected to the end of the first parallel microstrip line 312; the second parallel microstrip line 314 is connected in parallel to the junction of the second serial microstrip line 313 and the first inductor 319, and the second capacitor 318 is connected to the end of the second parallel microstrip line 314.
The second hybrid transmission line 32 includes a fifth serial microstrip line 321, a third parallel microstrip line 322, a sixth serial microstrip line 323, a fourth parallel microstrip line 324, a seventh serial microstrip line 325, an eighth serial microstrip line 326, a third capacitor 327, a fourth capacitor 328, and a second inductor 329;
the fifth serial microstrip line 321, the sixth serial microstrip line 323, the second inductor 329, the seventh serial microstrip line 325 and the eighth serial microstrip line 326 are connected in series in sequence; the third parallel microstrip line 322 is connected in parallel to the junction of the fifth serial microstrip line 321 and the sixth serial microstrip line 323, and the third capacitor 327 is connected to the end of the third parallel microstrip line 322; the fourth parallel microstrip line 324 is connected in parallel to the junction of the sixth serial microstrip line 323 and the second inductor 329, and the fourth capacitor 328 is connected to the end of the fourth parallel microstrip line 324.
The wilkinson power divider is a bisection power divider; corresponding microstrip lines in the first and second hybrid transmission lines 31 and 32 have equal electrical lengths and same characteristic impedance; corresponding capacitance values are equal, and corresponding inductance values are equal; and the two mixed transmission lines are completely symmetrical, and the connection modes are the same. Specifically, the characteristic impedance of the first serial microstrip line 311 is the same as that of the fifth serial microstrip line 321, and the electrical lengths are the same; the first parallel microstrip line 312 has the same characteristic impedance and the same electrical length as the third parallel microstrip line 322; the second serial microstrip line 313 has the same characteristic impedance and the same electrical length as the sixth serial microstrip line 323; the characteristic impedance of the second parallel microstrip line 314 is the same as that of the fourth parallel microstrip line 324, and the electrical lengths are the same; the third series microstrip line 315 has the same characteristic impedance and the same electrical length as the seventh series microstrip line 325; the fourth series microstrip line 316 has the same characteristic impedance and the same electrical length as the eighth series microstrip line 326; the first capacitor 317 and the third capacitor 327 have equal capacitance values, the second capacitor 318 and the fourth capacitor 328 have equal capacitance values, and the first inductor 319 and the second inductor 329 have equal inductance values.
The microstrip line 2 is a 50Ω microstrip line.
The following examples are given by way of illustration of detailed embodiments and specific procedures based on the technical scheme of the present invention, but the scope of the present invention is not limited to the following examples. The methods used in the examples described below are conventional methods unless otherwise specified.
Example 1:
according to the impedance transformation principle, the electrical length and characteristic impedance of each microstrip line in the hybrid transmission line can be calculated, and then the length and width of each microstrip line can be calculated. The values of the respective capacitances and inductances can also be calculated. And can be aided by ADS simulation software.
In this embodiment, the characteristic impedance of the microstrip line of the input port, the first output port, and the second output port is 50Ω; in one embodiment, the dielectric plate 1 is polytetrafluoroethylene with a dielectric constant of 4.4 and a thickness of 1.6mm.
In the present embodiment, the first series microstrip line 311 is arc-shaped with a radius of 13.7mm, a width of 0.64mm, and a central angle of 49.7 °. The first parallel microstrip line 312 is rectangular with a length of 3.81mm and a width of 1.35mm. The second series microstrip line 313 is arcuate with a radius of 13.7mm, a width of 0.64mm and a central angle of 47.3 °. The second parallel microstrip line 314 is rectangular with a length of 1.93mm and a width of 0.86mm. The third series microstrip line 315 is arcuate with a radius of 13.7mm, a width of 0.64mm and a central angle of 71 °. The fourth series microstrip line 316 is rectangular with a length of 2.8mm and a width of 0.64mm. The capacitance of the first capacitor 317 is 5pF, the capacitance of the second capacitor 318 is 7pF, and the inductance of the first inductor 319 is 72nH.
In this embodiment, the size data of each section of microstrip line in the second hybrid transmission line 32, the capacitance value of the capacitor, and the inductance value of the inductor are the same as those of the first hybrid transmission line 31.
In this embodiment, the resistance of the isolation resistor 4 is 62 ohms, and the capacitance of the isolation capacitor 5 is 33pF.
Referring to fig. 2, the return loss of the input port of the present embodiment (S 11 ) And (5) simulating a result graph. The abscissa represents frequency in MHz and the ordinate represents amplitude in db. As can be seen from FIG. 2, the return loss is greater than 20d within the bandwidth of 84-111 MHzAnd B, the matching of the input ports is good.
Referring to FIG. 3, the insertion loss of the output port of the present embodiment (S 21 、S 31 ) And (5) simulating a result graph. The abscissa represents frequency in MHz and the ordinate represents amplitude in db. As can be seen from fig. 3, the insertion loss of both the first output port and the second output port is less than 3.1dB over a bandwidth of 80-112 MHz.
Referring to fig. 4, the return loss of the first output port and the second output port of the present embodiment (S 22 、S 33 ) And (5) simulating a result graph. The abscissa represents frequency in MHz and the ordinate represents amplitude in db. As can be seen from fig. 4, the return loss of both the first output port and the second output port is greater than 20dB over the bandwidth of 78-121 MHz, indicating that both output ports are well matched.
Referring to fig. 5, the output port isolation (S 23 ) The abscissa represents frequency in MHz, and the ordinate represents amplitude in db. The isolation between the first output port and the second output port is greater than 20dB over a bandwidth of 79-120 MHz. Indicating that the two output ports interfere very little with each other.
In summary, the present invention provides a novel microminiaturized wilkinson power divider. A hybrid transmission line of a novel structure is employed. The total electrical length of the hybrid transmission line is only 9 degrees, which is far smaller than the traditional 90 degrees, and the size of the power divider is greatly reduced. The circuit area occupied by the microminiaturized Wilkinson power divider is only 10% of that of the traditional Wilkinson power divider.
The embodiments described above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the embodiments described above, and any other changes, modifications, substitutions, combinations, simplifications, and equivalents that do not depart from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (3)
1. A microminiaturized wilkinson power divider, comprising: the device comprises a dielectric plate (1), a microstrip line (2), a hybrid transmission line (3), an isolation resistor (4) and an isolation capacitor (5); the microstrip line (2) comprises an input microstrip line (21), a first output microstrip line (22) and a second output microstrip line (23); the hybrid transmission line (3) comprises a first hybrid transmission line (31) and a second hybrid transmission line (32); one end of the first hybrid transmission line (31) is connected with the input microstrip line (21), and the other end of the first hybrid transmission line (31) is connected with the first output microstrip line (22); one end of the second mixed transmission line (32) is connected with the input microstrip line (21), and the other end of the second mixed transmission line (32) is connected with the second output microstrip line (23); one end of the isolation resistor (4) is connected with the second output microstrip line (23), the other end of the isolation resistor (4) is connected with one end of the isolation capacitor (5), and the other end of the isolation capacitor (5) is connected with the first output microstrip line (22);
the first hybrid transmission line (31) comprises a first serial microstrip line (311), a first parallel microstrip line (312), a second serial microstrip line (313), a second parallel microstrip line (314), a third serial microstrip line (315) and a fourth serial microstrip line (316), wherein a first capacitor (317), a second capacitor (318) and a first inductor (319);
the first serial microstrip line (311), the second serial microstrip line (313), the first inductor (319), the third serial microstrip line (315) and the fourth serial microstrip line (316) are connected in series in sequence; the first parallel microstrip line (312) is connected in parallel with the joint of the first serial microstrip line (311) and the second serial microstrip line (313), and the first capacitor (317) is connected at the tail end of the first parallel microstrip line (312); the second parallel microstrip line (314) is connected in parallel with the joint of the second serial microstrip line (313) and the first inductor (319), and the second capacitor (318) is connected at the tail end of the second parallel microstrip line (314);
the first serial microstrip line (311), the second serial microstrip line (313) and the third serial microstrip line (315) are all arc-shaped;
the second hybrid transmission line (32) comprises a fifth serial microstrip line (321), a third parallel microstrip line (322), a sixth serial microstrip line (323), a fourth parallel microstrip line (324), a seventh serial microstrip line (325), an eighth serial microstrip line (326), a third capacitor (327), a fourth capacitor (328) and a second inductor (329);
the fifth serial microstrip line (321), the sixth serial microstrip line (323), the second inductor (329), the seventh serial microstrip line (325) and the eighth serial microstrip line (326) are connected in series in sequence; the third parallel microstrip line (322) is connected in parallel with the joint of the fifth serial microstrip line (321) and the sixth serial microstrip line (323), and the third capacitor (327) is connected at the tail end of the third parallel microstrip line (322); the fourth parallel microstrip line (324) is connected in parallel with the joint of the sixth serial microstrip line (323) and the second inductor (329), and the fourth capacitor (328) is connected at the tail end of the fourth parallel microstrip line (324);
the fifth serial microstrip line (321), the sixth serial microstrip line (323) and the seventh serial microstrip line (325) are all arc-shaped.
2. A microminiaturized wilkinson power divider according to claim 1, wherein said wilkinson power divider is a bisection power divider; corresponding microstrip lines in the first mixed transmission line (31) and the second mixed transmission line (32) have equal electrical lengths and same characteristic impedance; corresponding capacitance values are equal, and corresponding inductance values are equal; and the two mixed transmission lines are completely symmetrical, and the connection modes are the same.
3. A microminiaturized wilkinson power divider according to claim 1, characterized in that said microstrip line (2) is a 50Ω microstrip line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810838583.3A CN108767408B (en) | 2018-07-27 | 2018-07-27 | Microminiaturized wilkinson power divider |
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| CN201810838583.3A CN108767408B (en) | 2018-07-27 | 2018-07-27 | Microminiaturized wilkinson power divider |
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| CN108767408B true CN108767408B (en) | 2023-09-19 |
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| US12009565B2 (en) | 2020-05-14 | 2024-06-11 | Nxp B.V. | Power combiner/splitter for millimetre wave applications |
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