CN104466328B - A kind of balance/unbalance formula filters power splitter - Google Patents
A kind of balance/unbalance formula filters power splitter Download PDFInfo
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Abstract
The embodiment of the invention discloses a kind of balance/unbalance formula filters power splitter, including：1 rectangle branched structure (5,6,7 and 8 surround), 4 open circuited transmission lines (9,10,11 and 12) for being connected to 4 summits of rectangle branched structure, 2 branch transmission lines (13 and 14) for being connected to rectangle branched structure, 1 isolation transmission line (15), 1 isolation resistance (16), 2 balanced types input transmission line (2 and 4) and 2 unbalanceds output transmission line (1 and 3).The invention provides balance/unbalance formula power splitter, which not only has filter function and a common mode inhibition function, but also have that simple structure, size are little, technique tolerance is high, low cost the characteristics of.
Description
Technical Field
The invention relates to the technical field of radio frequency, in particular to a balanced-unbalanced type filtering power divider.
Background
The power divider is a device for dividing one path of input signal energy into two or more paths of energy with equal or unequal outputs. The power divider is generally divided into one-to-two, one-to-three, one-to-six, and the like according to the number of outputs. The main technical parameters of the power divider include power loss (including insertion loss, distribution loss and reflection loss), voltage standing wave ratio of each port, isolation, amplitude balance, phase balance, power capacity, bandwidth and the like among the power distribution ports.
Nowadays, with the rapid development of radio frequency technology, balanced power dividers are widely used because of their advantages such as convenient connection with other balanced devices and better common mode rejection. In some rf systems, there are not only balanced ports but also unbalanced ports, i.e., single-ended ports, so a balanced-unbalanced power splitter with a common mode rejection function is needed. To date, there are a number of balanced-unbalanced duplexer and filter designs, while balanced-unbalanced power dividers are very few. Moreover, the existing balance-unbalance power divider needs to process a double-sided circuit, so that the result is complex, and the requirement on processing precision is higher.
On the other hand, the integrated design is widely applied to radio frequency systems because of the advantages of small size, multiple functions and the like. For example, power dividers incorporating filter functions have been widely used. However, so far, only single-ended and fully balanced filter power dividers exist, and no balanced-unbalanced filter power divider exists. In the prior art, at least one balanced-unbalanced power divider and two single-ended filters or one balanced filter and one balanced-unbalanced power divider are required for realizing the performance. Resulting in the prior art being not only large in size but also costly.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a simple, small, and low cost balanced-unbalanced filter power divider, aiming at the defects that the existing balanced-unbalanced power divider has no filtering function, is complex in structure, has low processing tolerance, and is large in size and high in cost.
In order to solve the above technical problem, an embodiment of the present invention provides a balanced-unbalanced filter power divider, including: the first input end transmission line, the second input end transmission line, the first output end transmission line, the second output end transmission line, the first transmission line, the second transmission line, the third transmission line, the fourth transmission line, the first open-circuit transmission line, the second open-circuit transmission line, the third open-circuit transmission line, the fourth open-circuit transmission line, the first branch transmission line, the second branch transmission line, the isolation transmission line and the isolation resistor; wherein,
the first transmission line, the second transmission line, the third transmission line and the fourth transmission line are sequentially connected end to form a rectangular branch line structure, the electrical lengths of the first transmission line and the third transmission line are both half wavelength of the center frequency, and the electrical lengths and impedances of the second transmission line and the fourth transmission line are the same;
the first open circuit transmission line, the second open circuit transmission line, the third open circuit transmission line and the fourth open circuit transmission line have the same electrical length and impedance, one end of each open circuit transmission line is connected to 4 vertexes of the rectangular branch structure, and the other end of each open circuit transmission line is open;
the first branch transmission line and the second branch transmission line have the same electrical length and impedance; one end of the first branch transmission line is connected to the midpoint of the second transmission line, and the other end of the first branch transmission line is grounded; one end of the second branch transmission line is connected to the midpoint of the fourth transmission line, and the other end of the second branch transmission line is grounded; the impedances of the first branch transmission line, the first open-circuit transmission line and the second transmission line are the same;
one end of the isolation transmission line is connected to the midpoint of the third transmission line, and the other end of the isolation transmission line is open-circuited;
one end of the isolation resistor is connected to the midpoint of the third transmission line, and the other end of the isolation resistor is grounded;
the first input end transmission line and the second input end transmission line form a balanced input port of the filtering power divider and are respectively connected to two ends of the first transmission line;
the first output end transmission line and the second output end transmission line are two unbalanced single-ended output ports of the filtering power divider and are respectively connected to two ends of the third transmission line;
the first input end transmission line, the second input end transmission line, the first output end transmission line and the second output end transmission line are identical in electrical length and impedance.
Preferably, the transmission line includes a microstrip transmission line and a coplanar waveguide transmission line;
preferably, the first open-circuit transmission line, the second open-circuit transmission line, the third open-circuit transmission line and the fourth open-circuit transmission line are accommodated in the rectangular branch structure and are formed by connecting two sections of transmission lines, namely a diagonal section of transmission line and a horizontal section of transmission line; wherein the diagonal segment transmission line is connected to the vertex of the rectangular branch structure, and the horizontal segment transmission line is open-circuited and parallel to the first transmission line; the horizontal transmission lines of the first open transmission line, the second open transmission line, the third open transmission line and the fourth open transmission line have the same electrical length.
Preferably, the first input end transmission line, the second input end transmission line, the first output end transmission line and the second output end transmission line are disposed outside the rectangular branch structure, the first output end transmission line and the first input end transmission line extend along a length direction of the second transmission line, and the second output end transmission line and the second input end transmission line extend along a length direction of the fourth transmission line.
Preferably, the first branch transmission line and the second branch transmission line are open-circuit transmission lines or short-circuit transmission lines and are accommodated in the rectangular branch structure.
Preferably, the electrical lengths of the first open transmission line, the second open transmission line, the third open transmission line and the fourth open transmission line are used for adjusting the frequency of the transmission zero of the filtering power divider.
Preferably, the electrical lengths of the second transmission line and the first branch transmission line are used to adjust the 1-dB bandwidth and out-of-band rejection of the filtering power divider by the following equations:
tanθ1tanθ2(2tanθ3+tanθ2)＝tanθ3+tanθ2-tan2θ2tanθ3
wherein Z is0Is the impedance of the transmission line at the first output terminal, Z3Is the impedance of the second transmission line, θ1Is the electrical length, θ, of the first open-circuit transmission line2Is half of the electrical length of the second transmission line, theta3The electrical length of the first branch transmission line.
Preferably, the impedance of the third transmission line and the isolation resistor value are used to select by the following formula:
wherein Z is0Is the impedance of the transmission line at the first output terminal, Z2R is the impedance of the third transmission line, and R is the resistance of the isolation resistor.
Preferably, the impedance of the first transmission line is used for adjusting the common-mode rejection bandwidth of the filtering power divider.
Preferably, the width of the third transmission line is used for adjusting the isolation amplitude of the filtering power divider; the electrical length of the isolation transmission line is used for adjusting the isolation frequency of the filtering power divider.
The embodiment of the invention has the following beneficial effects: the invention provides a balance-unbalance type filtering power divider with a filtering function and a common mode rejection function, which has the advantages of simple structure, small size, high process tolerance and low cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a balanced-unbalanced filter power divider according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a balanced-unbalanced filter power divider according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of a balanced-unbalanced filter power divider according to a first embodiment of the present invention;
fig. 4 is a differential mode response diagram of the balanced-unbalanced filter power divider according to the first embodiment of the present invention;
fig. 5 is a common-mode response diagram of the balanced-unbalanced filter power divider according to the first embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a balanced-unbalanced filter power divider according to a first embodiment of the present invention. As shown in fig. 1, the balanced-unbalanced filter power divider provided in this embodiment includes: the circuit comprises a first input end transmission line 2, a second input end transmission line 4, a first output end transmission line 1, a second output end transmission line 3, a first transmission line 5, a second transmission line 6, a third transmission line 7, a fourth transmission line 8, a first open-circuit transmission line 9, a second open-circuit transmission line 10, a third open-circuit transmission line 11, a fourth open-circuit transmission line 12, a first branch transmission line 13, a second branch transmission line 14, an isolation transmission line 15 and an isolation resistor 16.
The first transmission line 5, the second transmission line 6, the third transmission line 7 and the fourth transmission line 8 are connected end to end in sequence to form a rectangular branch line structure. The electrical lengths of the first transmission line 5 and the third transmission line 7 are each one-half wavelength of the center frequency. The electrical length and impedance of the second transmission line 6 and the fourth transmission line 8 are the same.
The first open transmission line 9, the second open transmission line 10, the third open transmission line 11 and the fourth open transmission line 12 are accommodated in the rectangular branch line structure, and one end of each of the 4 open transmission lines is connected to 4 vertexes of the rectangular branch line structure, and the other end is open. The electrical length and impedance of the 4 open-circuit transmission lines are the same. The 4 open-circuit transmission lines are accommodated in the rectangular branch structure, so that the space is fully utilized, and the size and the dimension of the balance-unbalance type filtering power divider are reduced.
The first branch transmission line 13 and the second branch transmission line 14 are accommodated in the rectangular branch structure, and have the same electrical length and impedance. One end of the first branch transmission line 13 is connected to the midpoint of the second transmission line 6, and the other end is grounded; one end of the second branch transmission line 14 is connected to the midpoint of the fourth transmission line 8, and the other end is grounded. The impedances of the first branch transmission line 13, the first open-circuit transmission line 9, and the second transmission line 6 are also the same.
The isolated transmission line 15 is accommodated in the rectangular branch structure, and one end thereof is connected to the midpoint of the third transmission line 7, and the other end thereof is open-circuited.
The isolation resistor 16 has one end connected to the midpoint of the third transmission line 7 and the other end connected to ground. In the present embodiment, the isolation resistor 16 is disposed outside the rectangular branch structure for the purpose of more compact structure and smaller size. In another preferred embodiment provided by the present invention, the isolation resistor 16 can be disposed inside the rectangular branch structure according to actual requirements.
The first input end transmission line 2 and the second input end transmission line 4 form a balanced input port of the filtering power divider and are respectively connected to two ends of a first transmission line 5.
The first output end transmission line 1 and the second output end transmission line 3 are two unbalanced single-ended output ports of the filtering power divider, and are respectively connected to two ends of a third transmission line 7.
The first input transmission line 2, the second input transmission line 4, the first output transmission line 1 and the second output transmission line 3 have the same electrical length and impedance.
In the present embodiment, the transmission line includes a microstrip transmission line and a coplanar waveguide transmission line.
As shown in fig. 1, the first open transmission line 9, the second open transmission line 10, the third open transmission line 11 and the fourth open transmission line 12 are preferably formed by connecting two transmission lines, namely, a diagonal transmission line and a horizontal transmission line. The 4 open-circuit transmission lines are connected to the corresponding vertex of the rectangular branch structure through respective oblique line segment transmission lines, and the horizontal segment transmission line is open-circuit and parallel to the first transmission line 5. The electrical lengths of the horizontal segments of the 4 open-circuit transmission lines are equal. In another preferred embodiment of the present invention, the structure of the 4 open transmission lines can be changed as long as the electrical length and impedance of the 4 open transmission lines are ensured to be equal. For example, the length ratio of the diagonal line segment transmission line and the horizontal line segment transmission line is appropriately adjusted or two or three diagonal line segment transmission lines are connected to one horizontal line segment transmission line to form an open transmission line.
As shown in fig. 1, preferably, the first input end transmission line 2, the second input end transmission line 4, the first output end transmission line 1 and the second output end transmission line 3 are disposed outside the rectangular branch structure, the first output end transmission line 1 and the first input end transmission line 2 extend along the length direction of the second transmission line 6, and the second output end transmission line 3 and the second input end transmission line 4 extend along the length direction of the fourth transmission line 8. It will be appreciated that the input and output transmission lines are typically disposed outside of the rectangular branch structure for ease of wiring. In another preferred embodiment provided by the present invention, the input transmission lines 2 and 4 may also extend along the length of the first transmission line 5, while the output transmission lines 1 and 3 may also extend along the length of the third transmission line 7. The extending directions of the output and output transmission lines can be designed by those skilled in the art according to the actual needs of the circuit.
As shown in fig. 1, the first branch transmission line 13 and the second branch transmission line 14 are preferably parallel to the first transmission line 5. The arrangement of the branch transmission lines 13 and 14 parallel to the first transmission line 5 makes the structure of the filtering power divider more compact, which is beneficial to reducing the size. In another preferred embodiment provided by the present invention, the branch transmission lines 13 and 14 may be accommodated in the rectangular branch structure in other manners.
As shown in fig. 1, the isolation transmission line 15 is preferably parallel to the second transmission line 6, so that the filter power divider can be more compact, which is beneficial to reduce the size. In another preferred embodiment of the present invention, the isolated transmission line 15 may be housed in the rectangular branch structure in other manners.
By implementing the embodiment, a balanced-unbalanced power divider with a filtering function can be provided. The power divider has the advantages of simple structure, small size, high process tolerance and low cost.
In the present embodiment, the first branch transmission line 13 and the second branch transmission line 14 are short-circuited transmission lines. It should be understood that, in the present invention, the first branch transmission line 13 and the second branch transmission line 14 can be designed as open-circuit transmission lines according to actual needs. The electrical length of an open-circuited transmission line is increased by a quarter wavelength of the center frequency compared to a short-circuited transmission line. Therefore, the balun using the open transmission line scheme requires a larger size of the filtering power divider, but also has a larger bandwidth. In addition, since the electrical length of the open transmission line is long, signal interference is likely to occur between the open transmission lines 9, 10, 11, and 12 in a small-sized circuit, thereby affecting the performance of the power divider.
Referring to fig. 2, fig. 2 is a schematic diagram of a balanced-unbalanced filter power divider according to a second embodiment of the present invention. As shown in fig. 2, the difference between the structure of the filtering power divider of this embodiment and the structure of the filtering power divider of the first embodiment is: the first open transmission line 9, the second open transmission line 10, the third open transmission line 11 and the fourth open transmission line 12 are arranged outside the rectangular branch structure and are a horizontal line segment, and the first branch transmission line 13 and the second branch transmission line 14 are also arranged outside the rectangular branch structure.
It should be understood that any transmission line connected to the rectangular branch structure can be selectively disposed inside or outside the rectangular branch structure in the present invention, and the isolation resistor 16 can also be selectively disposed inside or outside the rectangular branch structure.
In this embodiment, compared to the first embodiment, the first open transmission line 9, the second open transmission line 10, the third open transmission line 11 and the fourth open transmission line 12 are disposed outside the rectangular branch structure, which increases the size of the filter power divider, but simplifies the structure of 4 open transmission lines. Moreover, the open circuit transmission line and the first branch transmission line 13 and the second branch transmission line 14 do not interfere with each other, which is more beneficial to designing the first branch transmission line 13 and the second branch transmission line 14 as the open circuit transmission line, so that the filter power divider has better bandwidth.
Referring to fig. 3-5, fig. 3 is a schematic diagram of a balanced-unbalanced filter power divider according to a first embodiment of the present invention. As shown in fig. 3, the present embodiment will explain the principle of the balanced-unbalanced filter power divider provided in the present invention from the circuit point of view, therefore, for convenience of layout, the present embodiment purposely arranges the open transmission lines 9, 10, 11, and 12 outside the rectangular branch structure, because whether the open transmission lines 9, 10, 11, and 12 are inside the rectangular branch structure does not affect the electrical performance of the filter power divider, but only the structure and size.
As shown in fig. 3, the characteristic impedance of the first transmission line 5 is Z1The electrical length is one-half wavelength of the center frequency. The characteristic impedance of the second transmission line 6 and the third transmission line 7 is Z3Electrical length of 2 theta2. The characteristic impedance of the fourth transmission line 8 is Z2The electrical length is one-half wavelength of the center frequency. The characteristic impedance of the open transmission lines 9, 10, 11 and 12 is Z3Electrical length of theta1. The characteristic impedance of the branch transmission lines 13 and 14 is Z3Electrical length of theta3. The characteristic impedance of the isolated transmission line 15 is Z4Electrical length of theta4. The isolation resistor 16 has a resistance value R. Balanced input port a includes input transmission lines 2 and 4. The overall structure is a symmetrical structure, the symmetry line being shown as a dashed line in fig. 2. And the output transmission lines 1 and 3 form two unbalanced single-ended output ports of the filtering power divider.
During operation, a first transmission line 5 with half wavelength is added between the input ports 2 and 4, so that a differential signal can be fed into the balanced input port A; then by adding theta1、θ2And theta3The transmission line branches enable differential signals fed in by the balanced input port A to be evenly distributed to the unbalanced single-ended output ports 1 and 3, and further work is achievedThe rate allocation function and the simultaneous generation of the filtering function. Meanwhile, the isolation between the single-ended output ports 1 and 3 can be realized by adding a third transmission line 7 with a half wavelength, an isolation transmission line 15 and an isolation resistor 16 which is grounded between the unbalanced single-ended output ports 1 and 3.
For a power divider, some specific performance criteria, such as port matching, power equalization, and transmission port isolation, are usually considered. These three performance indicators are expressed by the S parameter as: sddAA<-20dB；SdsA1＝SdsA3＝-3dB；Sss31<-20 dB. From these S parameters, it can be further determined:
tanθ1tanθ2(2tanθ3+tanθ2)＝tanθ3+tanθ2-tan2θ2tanθ3(3)
wherein Z0The characteristic impedance of the input/output transmission lines 1, 2, 3 and 4 is typically 50 Ω. For convenience of calculation, Z3And R is typically 50 Ω.
Preferably, the electrical length θ of the open transmission lines 9, 10, 11 and 121The frequency of the transmission zero of the filtering power divider can be adjusted. In the present invention, θ1One quarter of a wavelength at the frequency at which the transmission zero is located. Therefore, θ can be determined by the known transmission zero frequency1Alternatively, θ may be selected1To control the transmission zero frequency of the power divider. On the basis of the above formula, theta can be adjusted through the formulas (1) and (3)2And theta3The 1-dB bandwidth and out-of-band rejection of the filtering power divider can be controlled. In the present inventionWith theta3Increase in bandwidth until SddAAUp to-20 dB at the center frequency.
Preferably, the characteristic impedance Z of the first transmission line 51The bandwidth of the common mode rejection of the filtering power divider can be adjusted. That is, Z may be determined by the common mode rejection bandwidth requirement of the rejection1By adjusting Z1The value of the common mode rejection bandwidth is used for designing a filtering power divider with a specific common mode rejection bandwidth. In the present invention, with Z1The bandwidth of the common mode rejection of the circuit is reduced.
Preferably, the isolation amplitude and the isolation frequency of the filtering power divider provided by the present invention can be adjusted by the width of the third transmission line 7 and the electrical length of the isolation transmission line 15, respectively.
In a preferred embodiment provided by the invention, the working frequency of the balance-unbalance type filtering power divider is 1.88GHz, a transmission zero point is near 2.1GHz, the 1-dB bandwidth is 7.5%, and the matching S of the input endddAAAt the center frequency to-20 dB, common mode rejection reaches 20dB and isolation reaches 15 dB. First and third transmission line lengths l147.2mm, first to fourth line transmission length l222mm, second and fourth transmission line length l39mm, first and second open transmission line lengths l42mm, isolated transmission line length l51.75mm, first transmission line width w11.4mm, first to fourth transmission line width w21mm, third transmission line width w30.5 mm. Fig. 4 and 5 are a differential mode response diagram and a common mode response diagram of the balanced-unbalanced filter power divider designed according to the size parameter. The figure shows the comparison result of the measured S parameter and the simulated S parameter.
It can be seen from fig. 4 that the single-ended output ports 1 and 3 have an amplitude | S around the center frequencyds1A|＝|Sds3AI-3 dB, that is to say the input power is equally distributed to the single-ended output ports 1 and 3. And exhibits a significant bandpass characteristic around a center frequency which is directed outwardThe S amplitude drops sharply. Therefore, the power divider shows a very significant band-pass filtering characteristic. And the isolation parameter | S between single-ended output ports 1 and 3ss31All basically below-15 dB, and the isolation characteristic completely meets the design requirement. And the port matching parameter | SddAAL is-40 dB at the center frequency and below-20 dB in the bandpass range. The port matching characteristics are good.
As can be seen from fig. 5, the common mode rejection parameter | SccAAThe amplitude of the I is basically 0dB, and the common-mode signal of the filtering power divider is basically and completely suppressed. As analyzed in fig. 4, the isolation of the common-mode signal in fig. 5 also meets design requirements.
From the above analysis, it can be seen that the balance-unbalance filtering power divider designed by the present invention can completely meet the design requirements. In addition, as can be seen from the figure, the measured S parameters and the simulated S parameters are basically completely overlapped. The structural and performance effectiveness of the balanced-unbalanced filter power divider provided by the invention is fully verified, and the structural and functional effectiveness of each transmission line component of the balanced-unbalanced filter power divider provided by the invention is also verified. According to the structure and the functions of the transmission line part provided by the invention, a person skilled in the art can design different balance-unbalance type filtering power dividers which work under various frequencies and meet various characteristic parameters.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A balanced-unbalanced filter power divider, comprising: the circuit comprises a first input end transmission line (2), a second input end transmission line (4), a first output end transmission line (1), a second output end transmission line (3), a first transmission line (5), a second transmission line (6), a third transmission line (7), a fourth transmission line (8), a first open circuit transmission line (9), a second open circuit transmission line (10), a third open circuit transmission line (11), a fourth open circuit transmission line (12), a first branch transmission line (13), a second branch transmission line (14), an isolation transmission line (15) and an isolation resistor (16); wherein,
the first transmission line (5), the second transmission line (6), the third transmission line (7) and the fourth transmission line (8) are sequentially connected end to form a rectangular branch line structure, the electrical lengths of the first transmission line (5) and the third transmission line (7) are half of the wavelength of the center frequency, and the electrical lengths and the impedances of the second transmission line (6) and the fourth transmission line (8) are the same;
the first open circuit transmission line (9), the second open circuit transmission line (10), the third open circuit transmission line (11) and the fourth open circuit transmission line (12) have the same electrical length and impedance, one end of each open circuit transmission line is connected to 4 vertexes of the rectangular branch line structure, and the other end of each open circuit transmission line is open;
the electrical length and impedance of the first branch transmission line (13) and the second branch transmission line (14) are the same; one end of the first branch transmission line (13) is connected to the midpoint of the second transmission line (6), and the other end of the first branch transmission line is grounded; one end of the second branch transmission line (14) is connected to the midpoint of the fourth transmission line (8), and the other end of the second branch transmission line is grounded; the impedances of the first branch transmission line (13), the first open-circuit transmission line (9) and the second transmission line (6) are the same;
one end of the isolation transmission line (15) is connected to the midpoint of the third transmission line (7), and the other end of the isolation transmission line is open-circuited;
one end of the isolation resistor (16) is connected to the midpoint of the third transmission line (7), and the other end of the isolation resistor is grounded;
the first input end transmission line (2) and the second input end transmission line (4) form a balanced input port of the filtering power divider and are respectively connected to two ends of the first transmission line (5);
the first output end transmission line (1) and the second output end transmission line (3) are two unbalanced single-ended output ports of the filtering power divider, and are respectively connected to two ends of the third transmission line (7);
the first input end transmission line (2), the second input end transmission line (4), the first output end transmission line (1) and the second output end transmission line (3) are identical in electrical length and impedance.
2. The balanced-unbalanced filter power divider according to claim 1, wherein the transmission line comprises a microstrip transmission line or a coplanar waveguide transmission line.
3. The balanced-unbalanced filter power divider according to claim 1, wherein the first open transmission line (9), the second open transmission line (10), the third open transmission line (11), and the fourth open transmission line (12) are accommodated in the rectangular branch line structure and are each formed by connecting two transmission lines, namely a diagonal transmission line and a horizontal transmission line; wherein the diagonal transmission line segment is connected to the vertex of the rectangular branch line structure, and the horizontal transmission line segment is open and parallel to the first transmission line (5); the horizontal transmission lines of the first open transmission line (9), the second open transmission line (10), the third open transmission line (11) and the fourth open transmission line (12) are equal in electrical length.
4. The balun according to claim 1, wherein the first input transmission line (2), the second input transmission line (4), the first output transmission line (1) and the second output transmission line (3) are disposed outside the rectangular branch line structure, the first output transmission line (1) and the first input transmission line (2) extend along a length direction of the second transmission line (6), and the second output transmission line (3) and the second input transmission line (4) extend along a length direction of the fourth transmission line (8).
5. The balanced-unbalanced filter power divider according to claim 1, wherein the first branch transmission line (13) and the second branch transmission line (14) are short-circuited transmission lines and are accommodated in the rectangular branch line structure.
6. The balanced-unbalanced filter power divider according to claim 1, wherein the electrical lengths of the first open transmission line (9), the second open transmission line (10), the third open transmission line (11) and the fourth open transmission line (12) are used to adjust the frequency of the transmission zero of the filter power divider.
7. The balanced-unbalanced filtered power divider according to claim 6, wherein the electrical lengths of the second transmission line (6) and the first branch transmission line (13) are used to adjust the 1-dB bandwidth and out-of-band rejection of the filtered power divider by the following equations:
tanθ1tanθ2(2tanθ3+tanθ2)＝tanθ3+tanθ2-tan2θ2tanθ3
wherein Z is0Is the impedance, Z, of the first output transmission line (1)3Is the impedance of the second transmission line (6), theta1Is the electrical length, theta, of the first open-circuit transmission line (9)2Is half of the electrical length of the second transmission line (6), theta3Is the electrical length of the first branch transmission line (13).
8. The balanced-unbalanced filtering power divider according to claim 1, wherein the impedance of the third transmission line (7) and the isolation resistor (16) resistance are used to select by the following equation:
wherein Z is0Is the impedance, Z, of the first output transmission line (1)2Is the impedance of the third transmission line (7) and R is the resistance of the isolation resistor (16).
9. The balanced-unbalanced filtered power divider according to claim 1, wherein the impedance of the first transmission line (5) is used to adjust the common-mode rejection bandwidth of the filtered power divider.
10. The balanced-unbalanced filter power divider according to claim 1, wherein the width of the third transmission line (7) is used to adjust the isolation amplitude of the filter power divider; the electrical length of the isolation transmission line (15) is used for adjusting the isolation frequency of the filtering power divider.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410714174.4A CN104466328B (en) | 2014-11-28 | 2014-11-28 | A kind of balance/unbalance formula filters power splitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410714174.4A CN104466328B (en) | 2014-11-28 | 2014-11-28 | A kind of balance/unbalance formula filters power splitter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104466328A CN104466328A (en) | 2015-03-25 |
| CN104466328B true CN104466328B (en) | 2017-03-15 |
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| CN105375095B (en) * | 2015-12-07 | 2018-10-23 | 南通大学 | The single-ended reverse phase power splitter of balanced type- |
| CN105576333A (en) * | 2016-02-03 | 2016-05-11 | 南通大学 | Balanced/single-end same-phase power divider |
| CN105591182B (en) * | 2016-02-25 | 2018-09-18 | 南通大学 | Balanced type-single-ended filter reverse phase power splitter |
| EP4245359A3 (en) * | 2016-03-09 | 2024-03-20 | Peerbridge Health, Inc. | System and method for monitoring conditions of a subject based on wireless sensor data |
| CN107369871A (en) * | 2016-05-11 | 2017-11-21 | 李汉忠 | Dual input power divider |
| CN105932391B (en) * | 2016-05-26 | 2019-07-05 | 南通大学 | The multistage single-ended reverse phase power splitter of balanced type- |
| CN109888441B (en) * | 2019-03-05 | 2021-02-26 | 南通大学 | Bandwidth-adjustable balanced filtering power divider |
| CN110739517B (en) * | 2019-10-31 | 2021-05-25 | 南通大学 | One-to-three single-ended-balanced microwave filtering power distribution system |
| CN115275545B (en) * | 2022-08-15 | 2024-01-12 | 南通大学 | Compact absorption type filtering power divider |
| CN116054772B (en) * | 2023-02-27 | 2023-08-04 | 南通大学 | Wide common mode rejection balanced band-pass filter |
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