CN112952331B - Miniaturized balanced-unbalanced filtering power divider - Google Patents
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- H—ELECTRICITY
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- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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- H01P5/12—Coupling devices having more than two ports
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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
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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
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
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Abstract
The invention discloses a miniaturized balanced-unbalanced filter power divider, which comprises a balanced differential signal input port A, a conversion circuit, a branch line, an output port, a resonance branch node and an isolation resistor, wherein the balanced differential signal input port A is connected with the conversion circuit; the power divider has the advantages of small circuit size, capability of distributing and transmitting power of differential signals and the like input by a balanced end to an unbalanced end, broadband filtering, high-performance common mode rejection, broadband in-phase output, good input and output impedance matching and the like.
Description
Technical Field
The invention relates to a microwave power divider, in particular to a miniaturized balanced-unbalanced filtering power divider.
Background
The power divider, a power divider for short, has the function of separating and combining signals, and is widely applied to antenna feed networks and power amplifiers, so that the power divider is receiving more and more attention.
With the continuous development of modern wireless communication systems, the requirements on the system performance are higher and higher, and especially in high-sensitivity networks, the influence of noise interference on the overall system performance is not negligible. The device with the balanced structure can inhibit common-mode signals, has strong anti-interference capability on noise, and is an important component in a modern communication system. For a system with both balanced and unbalanced ports, it is necessary to use a balanced to unbalanced power divider as the connecting device. In addition, the power divider with the filtering characteristic simultaneously realizes the functions of filtering and power distribution, and can play a role in reducing the structural size of a system. However, the existing balance-unbalance filtering power divider cannot simultaneously satisfy the functions of broadband high-performance common mode rejection, in-phase output of unbalanced signal output ports, miniaturization and the like. Therefore, there is a need for a miniaturized balun filter power divider with broadband, high performance common-mode rejection and in-phase output characteristics.
Disclosure of Invention
The invention provides a miniaturized balanced-unbalanced filter power divider, which aims to solve the problem that the existing balanced-unbalanced filter power divider cannot simultaneously meet the functions of broadband, high-performance common mode rejection, in-phase output of unbalanced signal output ports, miniaturization and the like.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a miniaturized balun filter power divider, comprising: the balanced differential signal input circuit comprises a balanced differential signal input port A, a conversion circuit, a branch line, an output port, a resonance branch section and an isolation resistor;
the balanced differential signal input port A comprises a first input port and a second input port;
the branch line comprises a first branch line and a second branch line, wherein one end of the first branch line is connected with the conversion circuit, and the other end of the first branch line is connected with the first output port; one end of the second branch line is connected with the conversion circuit, and the other end of the second branch line is connected with the second output port; the resonance branch sections comprise a first resonance branch section and a second resonance branch section; the first resonance branch section comprises a second short circuit branch section and a fifth capacitor; one end of the second short circuit branch section is connected to the connection position of the first branch line and the first output port, and the other end of the second short circuit branch section is grounded; one end of the fifth capacitor is connected to the joint of the first branch line and the first output port, and the other end of the fifth capacitor is grounded; the second resonance branch is connected with the joint of the second branch line and the second output port in a nodal manner; the second resonance branch section has the same structure as the first resonance branch section;
the conversion circuit comprises a first transmission line, a first short circuit branch section, a parallel coupling line, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor; one end of the first transmission line is connected with the second input port, and the other end of the first transmission line is connected with the first branch line; one end of the first short circuit branch section is connected to the joint of the first transmission line and the second input port, and the other end of the first short circuit branch section is grounded; one end of the parallel coupling line is connected with the first input port, and the other end of the parallel coupling line is connected with the second branch line; one end of the first capacitor is connected to the joint of the first input port and the parallel coupling line, and the other end of the first capacitor is grounded; one end of the second capacitor is connected to the joint of the second input port and the first transmission line, and the other end of the second capacitor is grounded; one end of the third capacitor is connected to the joint of the first transmission line and the first branch line, and the other end of the third capacitor is grounded; one end of the fourth capacitor is connected to the joint of the first transmission line and the first branch line, and the other end of the fourth capacitor is grounded;
one end of the isolation resistor is connected to the connection position of the first branch line and the first output port, and the other end of the isolation resistor is connected to the connection position of the second branch line and the second output port.
Further, the parallel coupled line comprises a first port, a second port, a third port and a fourth port; the first port and the second port are grounded; the third port is connected to the connection position of the first input port and the first capacitor: the fourth port is connected with the second branch line.
Furthermore, the characteristic impedance of the first short-circuit branch section and the second short-circuit branch section is Z1The characteristic impedance of the first transmission line, the first branch line and the second branch line is Z2The even mode impedance of the parallel coupling line is Ze, the odd mode impedance is Zo, and the following relations are satisfied:
furthermore, the first short-circuit branch section, the second short-circuit branch section, the first transmission line, the first branch line, the second branch line and the parallel coupling line have the same electrical length, and the electrical length is theta.
Further, the first capacitor and the second capacitorThe capacitance value of the capacitor and the fifth capacitor is C1The capacitance values of the third capacitor and the fourth capacitor are C2The following relationship is satisfied:
f0is the center frequency.
Has the advantages that: according to the miniaturized balance-unbalance filtering power divider, the structure realizes the filtering function and miniaturization by loading the short circuit branch sections and the capacitors; the broadband high-performance common mode rejection characteristic is realized by adopting the short-circuit coupling line. In addition, the power divider has the advantages of conversion function from differential signals to single-ended signals, good filtering performance, ideal input and output impedance matching characteristics, compact structure, small circuit size and the like, and meets the application requirements of modern microwave systems on miniaturization and multiple functions of devices.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a diagram of a miniaturized balun filter power divider of the present invention;
fig. 2 is a graph of reflection coefficient and filter transmission coefficient of a balanced differential signal input port of a miniaturized balun filter power divider according to the present invention;
fig. 3 is a graph of reflection coefficient and isolation of an unbalanced terminal signal output port of a miniaturized balun filter power divider according to the present invention;
FIG. 4 is a graph of the common mode rejection characteristic of a miniaturized balun filter power divider according to the present invention;
FIG. 5 is a phase difference diagram of the output signal of a miniaturized balun filter power divider according to the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application. The first and second elements are both elements, but they are not the same element.
The present embodiment provides a miniaturized balun filter power divider, as shown in fig. 1, including: the balanced differential signal input port A, the conversion circuit 3, the branch line, the output port, the resonance branch section and the isolation resistor 10;
the balanced differential signal input port A comprises a first input port 1 and a second input port 2;
the conversion circuit 3 comprises a first transmission line 31, a first short-circuit branch section 32, a parallel coupling line 33, a first capacitor 34, a second capacitor 35, a third capacitor 36 and a fourth capacitor 37; one end of the first transmission line 31 is connected with the second input port 2, and the other end is connected with the first branch line 4; one end of the first short-circuit branch section 32 is connected to the joint of the first transmission line 31 and the second input port 2, the other end of the first short-circuit branch section is grounded, and a filtering function and miniaturization can be realized by loading the short-circuit branch section and a capacitor; the parallel coupled line 33 comprises a first port 331, a second port 332, a third port 333 and a fourth port 334; the third port 333 is connected with the first input port 1, the fourth port 334 is connected with the second branch line 5, the first port 331 and the second port 332 are grounded, and the broadband high-performance common mode rejection characteristic is realized by adopting a short-circuit coupling line; one end of the first capacitor 34 is connected to the connection point of the first input port 1 and the parallel coupling line 33, and the other end is grounded; one end of the second capacitor 35 is connected to the connection between the second input port 2 and the first transmission line 31, and the other end is grounded; one end of the third capacitor 36 is connected to the connection position of the first transmission line 31 and the first branch line 4, and the other end is grounded; one end of the fourth capacitor 37 is connected to the connection point of the first transmission line 31 and the first branch line 4, and the other end is grounded;
the branch line comprises a first branch line 4 and a second branch line 5, wherein one end of the first branch line 4 is connected with the conversion circuit 3, and the other end of the first branch line is connected with the first output port 6; one end of the second branch line 5 is connected with the conversion circuit 3, and the other end of the second branch line is connected with the second output port 7;
the resonance branch sections comprise a first resonance branch section 8 and a second resonance branch section 9; the first resonance branch 8 comprises a second short-circuit branch 81 and a fifth capacitor 82; one end of the second short-circuit branch section 81 is connected to the connection position of the first branch line 4 and the first output port 6, and the other end is grounded; one end of the fifth capacitor 82 is connected to the connection position of the first branch line 4 and the first output port 6, and the other end is grounded; the second resonance branch section 9 is connected to the connection position of the second branch line 5 and the second output port 7, and the second resonance branch section 9 and the first resonance branch section 8 have the same structure;
one end of the isolation resistor 10 is connected to the connection between the first branch line 4 and the first output port 6, and the other end is connected to the connection between the second branch line 5 and the second output port 7.
Further, the characteristic resistances of the first short branch section 32 and the second short branch section 81All are Z1The characteristic impedance of the first transmission line 31, the first branch line 4 and the second branch line 5 is Z2The even mode impedance of the parallel coupling line 33 is Ze, the odd mode impedance is Zo, and the following relationship is satisfied:
further, the electrical lengths of the first short-circuit branch 32, the second short-circuit branch 81, the first transmission line 31, the first branch line 4, the second branch line 5, and the parallel coupling line 33 are equal, and the electrical length value is θ.
Further, the capacitance values of the first capacitor 34, the second capacitor 35 and the fifth capacitor 82 are C1The capacitance values of the third capacitor 36 and the fourth capacitor 37 are C2The following relationship is satisfied:
f0is the center frequency.
One embodiment of the present invention is as follows:
taking the center frequency of 0.95GHz and the working frequency band of 0.7-1.2GHz as an example, the impedance values of all the ports are Z 050 ohms; the electrical lengths of the first short branch 32, the second short branch 81, the first transmission line 31, the first branch line 4, the second branch line 5 and the parallel coupling line 33 are 35.27 degrees; the characteristic impedance of the first short-circuit branch 32 and the second short-circuit branch 81 is Z197.82 ohms; the characteristic impedance of the first transmission line 31, the first branch line 4 and the second branch line 5 is Z295.91 ohms; the even mode impedance of the parallel coupling line 33 is Ze ═ 97.82 ohm, and the odd mode impedance is Zo ═ 32.18 ohm; the capacitance values of the first capacitor 34, the second capacitor 35 and the fifth capacitor 82 are C14.8 picofarad; the capacitance values of the third capacitor 36 and the fourth capacitor are C25.7 picofarad; the resistance value of the isolation resistor 10 is R100 ohms;
as can be seen from the attached figure 2, the power divider provided by the invention has good performanceThe equal power distribution of the differential signals is realized by the filtering characteristic of the differential signal; reflection coefficient | S of balanced differential signal input port at center frequency of 0.95GHzddAAI is less than-40 dB, so that ideal input impedance matching characteristics are realized;
as can be seen from FIG. 3, at the center frequency of 0.95GHz, the reflection coefficient | S of the unbalanced-end signal output portss22The I is less than-40 dB, the ideal output impedance matching characteristic is realized, and the good isolation capability (| S) is provided between the two unbalanced terminal signal output portsss32Less than-25 dB);
as shown in fig. 4, the power divider provided by the present invention not only has good common mode rejection performance (| S) in the working frequency bandccAA|＝0dB，|SdcAA|、|Ssc2A|、|Ssc3AAll less than-95 dB) and has a wide common-mode rejection range;
in addition, as can be seen from fig. 5, the phase difference of the output signals between the two unbalanced-end signal output ports is 0 degree, and the broadband in-phase output characteristic is achieved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A miniaturized balun filter power divider, comprising: the balanced differential signal input circuit comprises a balanced differential signal input port A, a conversion circuit (3), branch lines, an output port, a resonance stub and an isolation resistor (10);
the balanced differential signal input port A comprises a first input port (1) and a second input port (2);
the branch line comprises a first branch line (4) and a second branch line (5), wherein one end of the first branch line (4) is connected with the conversion circuit (3), and the other end of the first branch line is connected with the first output port (6); one end of the second branch line (5) is connected with the conversion circuit (3), and the other end of the second branch line is connected with the second output port (7); the resonance branch section comprises a first resonance branch section (8) and a second resonance branch section (9); the first resonance branch (8) comprises a second short-circuit branch (81) and a fifth capacitor (82); one end of the second short circuit branch joint (81) is connected to the joint of the first branch line (4) and the first output port (6), and the other end of the second short circuit branch joint is grounded; one end of the fifth capacitor (82) is connected to the connection position of the first branch line (4) and the first output port (6), and the other end of the fifth capacitor is grounded; the second resonance branch section (9) is connected to the connection position of the second branch line (5) and the second output port (7); the second resonance branch section (9) and the first resonance branch section (8) have the same structure;
the conversion circuit (3) comprises a first transmission line (31), a first short-circuit branch section (32), a parallel coupling line (33), a first capacitor (34), a second capacitor (35), a third capacitor (36) and a fourth capacitor (37); one end of the first transmission line (31) is connected with the second input port (2), and the other end of the first transmission line is connected with the first branch line (4); one end of the first short circuit branch section (32) is connected to the joint of the first transmission line (31) and the second input port (2), and the other end of the first short circuit branch section is grounded; one end of the parallel coupling line (33) is connected with the first input port (1), and the other end of the parallel coupling line is connected with the second branch line (5); one end of the first capacitor (34) is connected to the connection position of the first input port (1) and the parallel coupling line (33), and the other end of the first capacitor is grounded; one end of the second capacitor (35) is connected to the connection position of the second input port (2) and the first transmission line (31), and the other end of the second capacitor is grounded; one end of the third capacitor (36) is connected to the joint of the first transmission line (31) and the first branch line (4), and the other end of the third capacitor is grounded; one end of the fourth capacitor (37) is connected to the joint of the first transmission line (31) and the first branch line (4), and the other end of the fourth capacitor is grounded;
the parallel coupled line (33) comprises a first port (331), a second port (332), a third port (333), and a fourth port (334); the first port (331) and the second port (332) are grounded; the third port (333) is connected with the connection part of the first input port (1) and the first capacitor (34): the fourth port (334) is connected with a second branch line (5);
a connecting line of the fourth port (334) and the second branch line (5) and a connecting line of the first transmission line (31) and the first branch line (4) are connected to a cross point in a crossed manner; -said third capacitance (36) is connected to said intersection point, and-said fourth capacitance (37) is connected to said intersection point;
one end of the isolation resistor (10) is connected to the connection position of the first branch line (4) and the first output port (6), and the other end of the isolation resistor is connected to the connection position of the second branch line (5) and the second output port (7).
2. A miniaturized balun filter power divider as claimed in claim 1, wherein the characteristic impedance of both the first short-circuit branch (32) and the second short-circuit branch (81) is Z1The characteristic impedance of the first transmission line (31), the first branch line (4) and the second branch line (5) is Z2The even mode impedance of the parallel coupling line (33) is Ze, the odd mode impedance is Zo, and the following relationship is satisfied:
3. a miniaturized balun filter power divider according to claim 1, characterized in that the electrical lengths of the first short-circuit branch (32), the second short-circuit branch (81), the first transmission line (31), the first branch line (4), the second branch line (5) and the parallel-coupled line (33) are equal and equal, and the electrical length is θ.
4. A miniaturized balun filter power divider as claimed in claim 3, wherein the capacitance values of the first capacitor (34), the second capacitor (35) and the fifth capacitor (82) are all C1The capacitance values of the third capacitor (36) and the fourth capacitor (37) are both C2And satisfies the following relationship:
f0is the center frequency; z1Is a characteristic impedance, Z, of the first short-circuit stub (32) and the second short-circuit stub (81)2The characteristic impedance of the first transmission line (31), the first branch line (4) and the second branch line (5).
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| CN113964467B (en) * | 2021-10-25 | 2022-05-17 | 金陵科技学院 | Balance-unbalanced type in-phase filtering power divider based on three-wire coupling |
| CN114497955B (en) * | 2022-02-15 | 2023-04-18 | 大连海事大学 | Balanced-unbalanced power divider with differential negative group time delay characteristic |
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| CN108023150A (en) * | 2016-10-28 | 2018-05-11 | Tdk株式会社 | Balanced-unbalanced transformer |
| CN111786062A (en) * | 2020-08-04 | 2020-10-16 | 大连海事大学 | Balanced/unbalanced power divider/combiner with unbalanced-end non-reflection filtering characteristic |
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| US7557673B1 (en) * | 2006-03-09 | 2009-07-07 | Bae Systems Information And Electronics Systems Integration Inc. | Wide bandwidth microwave balun |
| US9130252B2 (en) * | 2013-02-26 | 2015-09-08 | Raytheon Company | Symmetric baluns and isolation techniques |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023150A (en) * | 2016-10-28 | 2018-05-11 | Tdk株式会社 | Balanced-unbalanced transformer |
| CN111786062A (en) * | 2020-08-04 | 2020-10-16 | 大连海事大学 | Balanced/unbalanced power divider/combiner with unbalanced-end non-reflection filtering characteristic |
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| Title |
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| Design of Filtering Coupled-Line Trans-Directional Coupler with Broadband Bandpass Response;Hongmei Liu等;《Progress In Electromagnetics Research M》;20210120;第100卷;论文第163-172页 * |
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