CN112952332A - Balanced-unbalanced filtering power divider with unequal broadband division - Google Patents
Balanced-unbalanced filtering power divider with unequal broadband division Download PDFInfo
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- CN112952332A CN112952332A CN202110182004.6A CN202110182004A CN112952332A CN 112952332 A CN112952332 A CN 112952332A CN 202110182004 A CN202110182004 A CN 202110182004A CN 112952332 A CN112952332 A CN 112952332A
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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
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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
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- 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
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced with unbalanced lines or devices
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Abstract
The invention discloses a balanced-unbalanced filter power divider with unequal broadband division, which comprises: the balanced differential signal input port, the filtering branch node, the conversion circuit, the branch line, the unbalanced end signal output port and the isolation circuit; the filter has the functions of conversion from differential signals to single-ended signals, broadband filtering, broadband high-performance common-mode rejection, ideal input and output impedance matching and in-phase unequal power output, and meets the requirements of modern microwave systems on high-performance balanced-unbalanced filter power dividers.
Description
Technical Field
The invention relates to a microwave power divider, in particular to a balanced-unbalanced filter power divider with unequal broadband division.
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, noise interference has a great influence on the overall system performance. The device with balanced structure can suppress common mode signal, is an important component in modern communication system, and for the system with both balanced port and unbalanced port, it is necessary to use balanced to unbalanced power divider as the connecting device. However, the existing balance-unbalance filtering power divider cannot simultaneously satisfy broadband high-performance common mode rejection, broadband filtering, broadband in-phase unequal power output. Therefore, there is a need for a wideband balun filter power divider with high performance common mode rejection, in-phase unequal power output.
Disclosure of Invention
The invention provides a balanced-unbalanced filtering power divider with unequal broadband division, which is used for effectively solving the problem that the prior art cannot give consideration to broadband high-performance common mode rejection, broadband filtering and in-phase unequal power output of unbalanced signal output ports.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a balanced-unbalanced filter power divider with unequal bandwidth, comprising: balanced differential signal input port A, filtering branch section, converting circuit, branch line, unbalanced terminal signal output port, isolating circuit.
The balanced differential signal input port A comprises a first input port and a second input port, the filter branch sections comprise a first filter branch section and a second filter branch section, the branch lines comprise a first branch line and a second branch line, and the unbalanced terminal signal output port comprises a first output port and a second output port.
One end of the first filtering branch node is connected with the first input port, and the other end of the first filtering branch node is connected with the conversion circuit; one end of the second filtering branch node is connected with the second input port, and the other end of the second filtering branch node is connected with the conversion circuit; the first filtering branch section comprises a first transmission line, a first short-circuit branch section and a first open-circuit branch section, one end of the first transmission line is connected with the first input port, and the other end of the first transmission line is connected with the conversion circuit; one end of the first short circuit branch section is connected to the joint of the first input port and the first transmission line, and the other end of the first short circuit branch section is short-circuited; one end of the first open-circuit branch node is connected to the joint of the first input port and the first transmission line, and the other end of the first open-circuit branch node is open-circuit.
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 conversion circuit comprises a second transmission line, a second short circuit branch section and a parallel coupling line; one end of the second transmission line is connected with the second filtering branch section, and the other end of the second transmission line is connected with the first branch line; one end of the second short circuit branch section is connected to the joint of the second transmission line and the second filter branch section, and the other end of the second short circuit branch section is short-circuited.
The isolation circuit is connected with the joint of the first branch line and the first output port at one end and connected with the joint of the second branch line and the second output port at the other end, and comprises a third transmission line, a fourth transmission line, an isolation resistor, a fifth transmission line and a sixth transmission line; one end of the third transmission line is connected to the joint of the first branch line and the first output port, and the other end of the third transmission line is connected with the fourth transmission line; one end of the fourth transmission line is connected with the third transmission line, and the other end of the fourth transmission line is connected with the isolation resistor; one end of the isolation resistor is connected with the fourth transmission line, and the other end of the isolation resistor is connected with the fifth transmission line; one end of the fifth transmission line is connected with the isolation resistor, and the other end of the fifth transmission line is connected with the sixth transmission line; one end of the sixth transmission line is connected with the fifth transmission line, and the other end of the sixth transmission line 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 with the first filtering branch section; and the fourth port is connected with the joint of the second transmission line and the first branch line.
Further, the characteristic impedance Z of the second short-circuit branch0cAnd the characteristic impedance Z of the second transmission linecEven mode impedance Z with parallel coupled lineseOdd mode impedance ZoThe following relationship is satisfied:
further, the characteristic impedance Z of the first branch line2Characteristic impedance Z of the second branch line3A characteristic impedance Z of the third transmission line02A characteristic impedance Z of the fourth transmission line022A characteristic impedance Z of the fifth transmission line033And the characteristic impedance Z of the sixth transmission line03The following relationship is satisfied:
where k is the power allocation coefficient.
Further, the resistance R of the isolation resistor and the characteristic impedance Z of the fifth transmission line033And the characteristic impedance Z of the sixth transmission line03The following relationship is satisfied:
has the advantages that: the structure of the balance-unbalance filtering power divider with unequal broadband division provided by the invention realizes the broadband filtering function by loading the short circuit/open circuit branch section; by improving the isolation circuit, a transmission zero is generated on each of two sides of the passband, so that the filtering performance is improved; the broadband high-performance common mode rejection characteristic is realized by adopting the short-circuit coupling line. In addition, the power divider has the functions of converting differential signals into single-ended signals, ideal input and output impedance matching and in-phase unequal power output characteristics, and meets the requirements of modern microwave systems on high-performance balance-unbalance filter power dividers.
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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 schematic diagram of a broadband unequal-division balance-unbalance filter power divider according to the present invention;
fig. 2 is a graph of reflection coefficient and filter transmission coefficient of a balanced differential signal input port of a broadband unequal balanced-unbalanced filter power divider according to the present invention.
Fig. 3 is a graph of reflection coefficient and isolation of an unbalanced end signal output port of a broadband unequal balanced-unbalanced filter power divider according to the present invention.
Fig. 4 is a graph of the common-mode rejection characteristic of the broadband unequal-division balanced-unbalanced filter power divider of the present invention.
Fig. 5 is a graph of the amplitude difference and phase difference of the output signal of the broadband unequal balanced-unbalanced 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 balanced-unbalanced filter power divider with unequal broadband division, as shown in fig. 1, including: the balanced differential signal input port A, the filter stub, the conversion circuit 5, the branch line, the unbalanced terminal signal output port and the isolation circuit 10;
optionally, the balanced differential signal input port a includes a first input port 1 and a second input port 2, the filter branch includes a first filter branch 3 and a second filter branch 4, the branch line includes a first branch line 6 and a second branch line 7, and the unbalanced signal output port includes a first output port 8 and a second output port 9;
optionally, one end of the first filtering branch node 3 is connected to the first input port 1, and the other end is connected to the conversion circuit 5; one end of the second filter branch section 4 is connected with the second input port 2, and the other end of the second filter branch section is connected with the conversion circuit 5; the first filtering branch node 3 comprises a first transmission line 31, a first short-circuit branch node 32 and a first open-circuit branch node 33, one end of the first transmission line 31 is connected with the first input port 1, and the other end of the first transmission line 31 is connected with the conversion circuit 5; one end of the first short-circuit branch section 32 is connected to the connection position of the first input port 1 and the first transmission line 31, and the other end is short-circuited; one end of the first open-circuit branch section 33 is connected to the connection position of the first input port 1 and the first transmission line 31, and the other end is open-circuit. The second filter stub 4 has the same structure as the first filter stub 3; by loading the short circuit/open circuit tributary nodes, the broadband filtering function is realized.
Optionally, one end of the first branch line 6 is connected to the conversion circuit 5, and the other end is connected to the first output port 8; one end of the second branch line 7 is connected with the conversion circuit 5, and the other end is connected with the second output port 9.
Optionally, one end of the isolation circuit 10 is connected to a connection between the first branch line 6 and the first output port 8, and the other end is connected to a connection between the second branch line 7 and the second output port 9, and by improving the isolation circuit, a transmission zero is generated on each of two sides of the passband, thereby improving the filtering performance.
Optionally, the conversion circuit 5 includes a second transmission line 51, a second short-circuit stub 52, and a parallel coupling line 53; one end of the second transmission line 51 is connected with the second filter branch 4, and the other end is connected with the first branch line 6; one end of the second short-circuit branch section 52 is connected to the connection position of the second transmission line 51 and the second filter branch section 4, and the other end is short-circuited; the parallel coupled line 53 includes a first port 531, a second port 532, a third port 533 and a fourth port 534; the first port 531 and the second port 532 are grounded; the third port 533 is connected to the first filter branch node 3; the fourth port 334 is connected to the connection between the second transmission line 51 and the first branch line 6, and a broadband high-performance common mode rejection characteristic is realized by adopting a short-circuit coupling line.
Optionally, the characteristic impedance Z of the second short-circuit stub 520cAnd the characteristic impedance Z of the second transmission line 51cEven mode impedance Z with parallel coupled line 53eOdd mode impedance ZoThe following relationship is satisfied:
optionally, the isolation circuit 10 includes a third transmission line 101, a fourth transmission line 102, an isolation resistor 103, a fifth transmission line 104, and a sixth transmission line 105; one end of the third transmission line 101 is connected to the connection between the first branch line 6 and the first output port 8, and the other end is connected to the fourth transmission line 102; one end of the fourth transmission line 102 is connected with the third transmission line 101, and the other end is connected with the isolation resistor 103; one end of the isolation resistor 103 is connected with the fourth transmission line 102, and the other end is connected with the fifth transmission line 104; one end of the fifth transmission line 104 is connected with the isolation resistor 103, and the other end is connected with the sixth transmission line 105; one end of the sixth transmission line 105 is connected to the fifth transmission line 104, and the other end is connected to the connection point of the second branch line 7 and the second output port 9.
Optionally, the characteristic impedance Z of the first branch line 62Characteristic impedance Z of the second branch 73The characteristic impedance Z of the third transmission line 10102The characteristic impedance Z of the fourth transmission line 102022The characteristic impedance Z of the fifth transmission line 104033And the characteristic impedance Z of the sixth transmission line 10503The following relationship is satisfied:
where k is the power allocation coefficient.
Optionally, the resistance R of the isolation resistor 103 and the characteristic impedance Z of the fifth transmission line 104033And the characteristic impedance Z of the sixth transmission line 10503The following relationship is satisfied:
one embodiment of the present invention is as follows:
taking the center frequency of 1.5GHz, the working frequency band of 1.1-1.9GHz and the output power ratio of the unbalanced terminal of 3dB as an example, the impedance values of all the ports are Z 050 ohms; the lengths of the first short-circuit branch node 32 and the first open-circuit branch node 33 are one eighth of the wavelength corresponding to the center frequency; the lengths of the first transmission line 31, the second transmission line 51, the second short-circuit branch 52, the parallel coupling line 53, the first branch line 6, the second branch line 7, the third transmission line 101, the fourth transmission line 102, the fifth transmission line 104 and the sixth transmission line 105 are center frequenciesOne quarter of the corresponding wavelength; the characteristic impedance of the first short branch 32 and the first open branch 33 is Z01101.88 ohms; the characteristic impedance of the first transmission line 31 is Z166.67 ohms; the characteristic impedance of the second transmission line 51 is Zc103.697 ohms; the characteristic impedance of the second short branch 52 is Z0c102.634 ohms; the even mode impedance of the parallel coupled line 53 is Ze102.63 ohms with an odd mode impedance of Zo34.447 ohms; the characteristic impedance of the first branch line 6 and the second branch line 7 is respectively Z290.79 ohm and Z364.498 ohms; the characteristic impedances of the third 101, fourth 102, fifth 104 and sixth 105 transmission lines are respectively Z0271.83 ohm, Z02258.65 ohm Z03343.939 ohm and Z0376.105 ohms; the resistance value of the isolation resistor 103 is 50 ohms;
as can be seen from fig. 2, the power divider provided by the present invention has good filtering characteristics when the differential signal is input. In the working frequency band of 1.1-1.9GHz, | S corresponding to the first output port 8sd2A| is-4.77 +/-0.01 dB, and | S corresponding to the second output port 9sd3AThe | is-1.77 +/-0.01 dB, so that the unequal power output characteristic of the unbalanced terminal signal is realized;
as can be seen from the attached figure 3, in the working frequency band of 1.1-1.9GHz, the return loss and the isolation of the signal output port of the unbalanced terminal are both larger than 10 dB; unbalanced terminal signal output port | S at center frequency of 1.5GHzss22|、|Sss33|、|Sss32All is less than-30 dB, and has ideal impedance matching and isolation characteristics;
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-100 dB) and has a wide common-mode rejection range;
in addition, as can be seen from fig. 5, in the operating frequency band, the output signals between the two unbalanced terminal signal output ports have only a phase difference of 0 ± 0.12 degrees and an amplitude difference of 3 ± 0.13dB, and a flat unequal power division in-phase output characteristic is realized in the operating frequency band.
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 (5)
1. A balanced-unbalanced filter power divider with unequal bandwidth, comprising: the balanced differential signal input circuit comprises a balanced differential signal input port A, a filtering branch node, a conversion circuit (5), a branch line, an unbalanced terminal signal output port and an isolation circuit (10);
the balanced differential signal input port A comprises a first input port (1) and a second input port (2), the filter branch section comprises a first filter branch section (3) and a second filter branch section (4), the branch line comprises a first branch line (6) and a second branch line (7), and the unbalanced signal output port comprises a first output port (8) and a second output port (9);
one end of the first filtering branch node (3) is connected with the first input port (1), and the other end of the first filtering branch node is connected with the conversion circuit (5); one end of the second filtering branch node (4) is connected with the second input port (2), and the other end of the second filtering branch node is connected with the conversion circuit (5); the first filtering branch joint (3) comprises a first transmission line (31), a first short-circuit branch joint (32) and a first open-circuit branch joint (33), one end of the first transmission line (31) is connected with the first input port (1), and the other end of the first transmission line is connected with the conversion circuit (5); one end of the first short-circuit branch section (32) is connected to the joint of the first input port (1) and the first transmission line (31), and the other end of the first short-circuit branch section is short-circuited; one end of the first open-circuit branch joint (33) is connected to the joint of the first input port (1) and the first transmission line (31), and the other end of the first open-circuit branch joint is open-circuit; the second filter stub (4) has the same structure as the first filter stub (3);
one end of the first branch line (6) is connected with the conversion circuit (5), and the other end of the first branch line is connected with the first output port (8); one end of the second branch line (7) is connected with the conversion circuit (5), and the other end of the second branch line is connected with the second output port (9);
the conversion circuit (5) comprises a second transmission line (51), a second short-circuit branch section (52) and a parallel coupling line (53); one end of the second transmission line (51) is connected with the second filtering branch (4), and the other end of the second transmission line is connected with the first branch line (6); one end of the second short circuit branch section (52) is connected to the joint of the second transmission line (51) and the second filter branch section (4), and the other end of the second short circuit branch section is short-circuited;
one end of the isolation circuit (10) is connected to the connection position of the first branch line (6) and the first output port (8), and the other end of the isolation circuit is connected to the connection position of the second branch line (7) and the second output port (9); the isolation circuit (10) comprises a third transmission line (101), a fourth transmission line (102), an isolation resistor (103), a fifth transmission line (104) and a sixth transmission line (105); one end of the third transmission line (101) is connected to the connection position of the first branch line (6) and the first output port (8), and the other end of the third transmission line is connected with the fourth transmission line (102); one end of the fourth transmission line (102) is connected with the third transmission line (101), and the other end of the fourth transmission line is connected with the isolation resistor (103); one end of the isolation resistor (103) is connected with the fourth transmission line (102), and the other end of the isolation resistor is connected with the fifth transmission line (104); one end of the fifth transmission line (104) is connected with the isolation resistor (103), and the other end of the fifth transmission line is connected with the sixth transmission line (105); one end of the sixth transmission line (105) is connected with the fifth transmission line (104), and the other end of the sixth transmission line is connected to the connection position of the second branch line (7) and the second output port (9).
2. A broadband unequal balanced-unbalanced filter power divider according to claim 1, characterized in that the parallel coupled lines (53) comprise a first port (531), a second port (532), a third port (533) and a fourth port (534); the first port (531) and the second port (532) are grounded; the third port (533) is connected with the first filter branch (3); the fourth port (334) is connected with the connection position of the second transmission line (51) and the first branch line (6).
3. A broadband unequal balun filter power divider as claimed in claim 2, wherein the characteristic impedance Z of the second short-circuit branch (52) is0cAnd a characteristic impedance Z of the second transmission line (51)cAn even mode impedance Z with the parallel coupling line (53)eOdd mode impedance ZoThe following relationship is satisfied:
4. a broadband unequal balanced-unbalanced filter power divider according to claim 1, characterized in that the characteristic impedance Z of the first branch line (6) is2Characteristic impedance Z of the second branch line (7)3A characteristic impedance Z of the third transmission line (101)02A characteristic impedance Z of the fourth transmission line (102)022A characteristic impedance Z of the fifth transmission line (104)033And a characteristic impedance Z of the sixth transmission line (105)03The following relationship is satisfied:
where k is the power allocation coefficient.
5. The balun filter power divider according to claim 1, wherein the resistor R of the isolation resistor (103) and the characteristic impedance Z of the fifth transmission line (104) are set to be equal033And a characteristic impedance Z of the sixth transmission line (105)03The following relationship is satisfied:
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