CN104466328A - Balanced-unbalanced filter-divider - Google Patents
Balanced-unbalanced filter-divider Download PDFInfo
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- CN104466328A CN104466328A CN201410714174.4A CN201410714174A CN104466328A CN 104466328 A CN104466328 A CN 104466328A CN 201410714174 A CN201410714174 A CN 201410714174A CN 104466328 A CN104466328 A CN 104466328A
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Abstract
The embodiment of the invention discloses a balanced-unbalanced filter-divider. The balanced-unbalanced filter-divider comprises a rectangular branch structure defined by 5, 6, 7 and 8, four open circuit transmission lines (9, 10, 11 and 12) connected to the four vertices of the rectangular branch structure respectively, two subcircuit transmission lines (13 and 14) connected to the rectangular branch structure, an isolation transmission line (15), an isolation resistor (16), two balanced input transmission lines (2 and 4) and two non-balanced output transmission lines (1 and 3). The balanced-unbalanced filter-divider not only has a filtering function and a common-mode rejection function, but also has the advantages of being simple in structure, small in size, high in technology tolerability and low in cost.
Description
Technical field
The present invention relates to radio frequency arts, particularly relate to a kind of balance-unbalanced filtering power splitter.
Background technology
Power splitter full name power divider is that a road input signal energy is divided into two-way by one or multiple-channel output is equal or unequal Energy device.Power splitter by the number exported usually be divided into one-to-two, one point three and one points six etc.The voltage standing wave ratio of the important technological parameters power loss (comprise insertion loss, distribute loss and reflection loss) of power splitter, each port, isolation between power division port, amplitude balance, phase balance, power capacity and frequency bandwidth etc.
Nowadays, along with the fast development of radio-frequency technique, balanced type power splitter is because it convenient to be connected with other balanced type devices and the advantage such as good common mode inhibition is used widely.And in some radio systems, not only have the port of balanced type also to have the port of unbalanced, namely single-ended port, the power splitter therefore with the balance-unbalanced of common mode inhibition function in the urgent need to.Up to the present, have duplexer and the design of filter of many balance-unbalanceds, and the power splitter of balanced type-unbalanced is considerably less.And the power splitter of existing balance-unbalanced needs processing double-sided circuit so that result complexity, and higher to the requirement of machining accuracy.
On the other hand, Integration Design is widely used in radio system because of advantages such as the little function of its size are many.Such as, the power splitter of integrating filtering function is widely used.But, only have filtering power splitter that is single-ended and full-balance so far, also do not balance-filtering the power splitter of unbalanced.In prior art, realizing this performance at least needs the power splitter of a balance-unbalanced and two single-ended filters or the filter of a needs balanced type and the power splitter of a balance-unbalanced.Thus not only size is large but also cost is high to cause prior art.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, for existing balance-unbalanced power splitter does not have filter function and complex structure, processing tolerance are low and the existing defect that balance-unbalanced power splitter size is large, cost is high being integrated with filter function, provide balance-unbalanced filtering power splitter that a kind of structure is simple, size is little, cost is low.
In order to solve the problems of the technologies described above, embodiments provide a kind of balance-unbalanced filtering power splitter, comprising: first input end transmission line, the second input transmission line, the first output transmission line, the second output transmission line, the first transmission line, the second transmission line, the 3rd transmission line, the 4th transmission line, the first open circuited transmission line, the second open circuited transmission line, the 3rd open circuited transmission line, the 4th open circuited transmission line, the first branch transmission line, the second branch transmission line, isolation transmission line and isolation resistance; Wherein,
Described first transmission line, the second transmission line, the 3rd transmission line and the 4th transmission line head and the tail connect and compose a rectangle branch line structure successively, the electrical length of described first transmission line and described 3rd transmission line is 1/2nd wavelength of centre frequency, and described second transmission line is all identical with impedance with the electrical length of described 4th transmission line;
Described first open circuited transmission line, the second open circuited transmission line, the 3rd open circuited transmission line and the 4th open circuited transmission line have identical electrical length and impedance and its one end is connected to 4 summits of described rectangle branched structure, and the other end is opened a way;
Electrical length and the impedance of described first branch transmission line and described second branch transmission line are all identical; Described first branch transmission line one end is connected to the mid point of described second transmission line, other end ground connection; Described second branch transmission line one end is connected to the mid point of described 4th transmission line, other end ground connection; Described first branch transmission line, the first open circuited transmission line are identical with the impedance of the second transmission line;
One end of described isolation transmission line is connected to the mid point of described 3rd transmission line, and the other end is opened a way;
One end of described isolation resistance is connected to the mid point of described 3rd transmission line, other end ground connection;
Described first input end transmission line and described second input transmission line form the balanced type input port of described filtering power splitter, are connected to the two ends of described first transmission line respectively;
Described first output transmission line and described second output transmission line are the Single-end output port of two unbalanceds of described filtering power splitter, are connected to the two ends of described 3rd transmission line respectively;
Described first input end transmission line, the second input transmission line, the first output transmission line are all identical with impedance with the electrical length of the second output transmission line.
Preferably, described transmission line comprises microstrip transmission line and coplanar waveguide transmission line;
Preferably, described first open circuited transmission line, the second open circuited transmission line, the 3rd open circuited transmission line and the 4th open circuited transmission line to be placed in described rectangle branched structure and to be formed by connecting by an oblique line section transmission line and a horizontal segment transmission line two sections of transmission lines; Wherein, described oblique line section transmission line is connected to the summit of described rectangle branched structure, and described horizontal segment transmission line is opened a way and is parallel to described first transmission line; The electrical length of the described horizontal segment transmission line of described first open circuited transmission line, the second open circuited transmission line, the 3rd open circuited transmission line and the 4th open circuited transmission line is equal.
Preferably, described first input end transmission line, the second input transmission line, the first output transmission line and the second output transmission line are arranged at the outside of described rectangle branched structure, described first output transmission line and described first input end transmission line extend along the length direction of described second transmission line, and described second output transmission line and described second input transmission line extend along the length direction of described 4th transmission line.
Preferably, described first branch transmission line and described second branch transmission line are open circuited transmission line or short-circuited transmission line and are placed in described rectangle branched structure.
Preferably, the electrical length of described first open circuited transmission line, the second open circuited transmission line, the 3rd open circuited transmission line and the 4th open circuited transmission line is for regulating the frequency of the transmission zero of described filtering power splitter.
Preferably, the electrical length of described second transmission line and described first branch transmission line is used for the 1-dB bandwidth sum Out-of-band rejection being regulated described filtering power splitter by following formula:
tanθ
1tanθ
2(2tanθ
3+tanθ
2)＝tanθ
3+tanθ
2-tan
2θ
2tanθ
3
Wherein, Z
0for the impedance of described first output transmission line, Z
3for the impedance of described second transmission line, θ
1for the electrical length of described first open circuited transmission line, θ
2for the half of the electrical length of described second transmission line, θ
3for the electrical length of described first branch transmission line.
Preferably, the impedance of described 3rd transmission line and described isolation resistance resistance are used for being selected by following formula:
Wherein, Z
0for the impedance of described first output transmission line, Z
2for the impedance of described 3rd transmission line, R is the resistance of described isolation resistance.
Preferably, the impedance of described first transmission line is for regulating the common mode inhibition bandwidth of described filtering power splitter.
Preferably, the width of described 3rd transmission line is for regulating the isolation magnitude of described filtering power splitter; The electrical length of described isolation transmission line is for regulating the isolation frequency of described filtering power splitter.
Implement the embodiment of the present invention, there is following beneficial effect: the invention provides a kind of balance-unbalanced filtering power splitter with filter function and common mode inhibition function, described power divider structure is simple, size is little, technique tolerance is high and cost is low.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the first embodiment balance-unbalanced filtering power divider structure schematic diagram provided by the invention;
Fig. 2 is the second embodiment balance-unbalanced filtering power divider structure schematic diagram provided by the invention;
Fig. 3 is the first embodiment balance-unbalanced filtering power splitter principle schematic provided by the invention;
Fig. 4 is the first embodiment balance-unbalanced filtering power splitter differential-mode response figure provided by the invention;
Fig. 5 is the first embodiment balance-unbalanced filtering power splitter common-mode response figure provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
Refer to Fig. 1, Fig. 1 is the first embodiment balance-unbalanced filtering power divider structure schematic diagram provided by the invention.As shown in Figure 1, balance-unbalanced filtering power splitter that the present embodiment provides comprises: first input end transmission line 2, second input transmission line 4, first output transmission line 1, second output transmission line 3, first transmission line 5, second transmission line 6, the 3rd transmission line 7, the 4th transmission line 8, first open circuited transmission line 9, second open circuited transmission line 10, the 3rd open circuited transmission line 11, the 4th open circuited transmission line 12, first branch transmission line 13, second branch transmission line 14, isolation transmission line 15 and isolation resistance 16.
First transmission line 5, second transmission line 6, the 3rd transmission line 7 and the 4th transmission line 8 head and the tail connect and compose a rectangle branch line structure successively.The electrical length of the first transmission line 5 and the 3rd transmission line 7 is 1/2nd wavelength of centre frequency.Second transmission line 6 is all identical with impedance with the electrical length of the 4th transmission line 8.
First open circuited transmission line 9, second open circuited transmission line 10, the 3rd open circuited transmission line 11 and the 4th open circuited transmission line 12 are placed in rectangle branch line inside configuration, and 4 one end of open circuited transmission line is connected to 4 summits of rectangle branched structure, the other end is opened a way.Article 4, the electrical length of open circuited transmission line and impedance all identical.4 open circuited transmission lines are placed in rectangle branched structure inside be conducive to making full use of space, reduce volume and the size of balance-unbalanced filtering power splitter.
First branch transmission line 13 and the second branch transmission line 14 are placed in described rectangle branched structure inside and its electrical length and impedance are all identical.Wherein, one end of the first branch transmission line 13 is connected to the mid point of the second transmission line 6, other end ground connection; One end of second branch transmission line 14 is connected to the mid point of the 4th transmission line 8, other end ground connection.In addition, the first branch transmission line 13, first open circuited transmission line 9 is also identical with the impedance of the second transmission line 6.
Isolation transmission line 15 is placed in the mid point that inner and its one end of rectangle branched structure is connected to the 3rd transmission line 7, and the other end is opened a way.
One end of isolation resistance 16 is connected to the mid point of the 3rd transmission line 7, other end ground connection.In the present embodiment, in order to structure is compacter, size is less, isolation resistance 16 is arranged at the outside of rectangle branched structure.In another preferred embodiment provided by the invention, isolation resistance 16 can be arranged at the inside of rectangle branched structure according to actual needs.
First input end transmission line 2 and the second input transmission line 4 form the balanced type input port of filtering power splitter, are connected to the two ends of the first transmission line 5 respectively.
First output transmission line 1 and the second output transmission line 3 are the Single-end output port of two unbalanceds of filtering power splitter, are connected to the two ends of the 3rd transmission line 7 respectively.
First input end transmission line 2, second input transmission line 4, first output transmission line 1 is all identical with impedance with the electrical length of the second output transmission line 3.
In the present embodiment, transmission line comprises microstrip transmission line and coplanar waveguide transmission line.
As shown in Figure 1, preferably, the first open circuited transmission line 9, second open circuited transmission line 10, the 3rd open circuited transmission line 11 and the 4th open circuited transmission line 12 are formed by connecting by an oblique line section transmission line and a horizontal segment transmission line two sections of transmission lines.Wherein, 4 open circuited transmission lines are all connected to the respective vertices of rectangle branched structure by respective oblique line section transmission line, and horizontal segment transmission line is opened a way and is parallel to the first transmission line 5.Article 4, the electrical length of the horizontal segment transmission line of open circuited transmission line is equal.In another preferred embodiment of the present invention, the structure of 4 open circuited transmission lines can also carry out suitable change, as long as ensure that the electrical length of 4 open circuited transmission lines is equal with impedance.Such as, suitable adjustment oblique line section transmission line is with the length ratio of horizontal segment transmission line or be connected with a horizontal segment transmission line by two or three oblique line section transmission lines, forms an open circuited transmission line.
As shown in Figure 1, preferably, first input end transmission line 2, second input transmission line 4, first output transmission line 1 and the second output transmission line 3 are arranged at the outside of rectangle branched structure, first output transmission line 1 and first input end transmission line 2 extend along the length direction of the second transmission line 6, and the second output transmission line 3 and the second input transmission line 4 extend along the length direction of the 4th transmission line 8.Should be understood that conveniently line, generally input and output transmission line are arranged at the outside of rectangle branched structure.In another preferred embodiment provided by the invention, input transmission line 2 and 4 can also extend along the length direction of the first transmission line 5, and output transmission line 1 and 3 can also extend along the length direction of the 3rd transmission line 7.Those skilled in the art can design the bearing of trend of output and output transmission line according to the actual needs of circuit.
As shown in Figure 1, preferably, the first branch transmission line 13 and the second branch transmission line 14 are parallel to the first transmission line 5.Branch transmission line 13 and 14 being parallel to the first transmission line 5 setting can make the structure of filtering power splitter compacter, is conducive to reduced in size.In another preferred embodiment provided by the invention, branch transmission line 13 and 14 can also otherwise be placed in rectangle branched structure.
As shown in Figure 1, preferably, isolation transmission line 15 is parallel to the second transmission line 6, thus the structure of filtering power splitter can be made compacter, is conducive to reduced in size.In another preferred embodiment provided by the invention, isolation transmission line 15 can also otherwise be placed in rectangle branched structure.
Implement the present embodiment, a kind of balance-unbalanced power splitter with filter function can be provided.This power splitter has that structure is simple, size is little, technique tolerance is high and the advantage that cost is low.
In the present embodiment, the first branch transmission line 13 and the second branch transmission line 14 are short-circuited transmission line.Should be understood that in the present invention, according to actual needs the first branch transmission line 13 and the second branch transmission line 14 can be designed to open circuited transmission line.Compared with short-circuited transmission line, the electrical length of open circuited transmission line will increase the quarter-wave of centre frequency.Therefore, adopt the balance of open circuited transmission line scheme-non-equilibrium to be that filtering power splitter needs larger size, but also there is larger bandwidth simultaneously.In addition, because adopt the electrical length of open circuited transmission line to grow, in small size circuit, easily and open circuited transmission line 9,10, there is signal disturbing between 11 and 12, thus affect power splitter performance.
Please participate in Fig. 2, Fig. 2 is the second embodiment balance-unbalanced filtering power divider structure schematic diagram provided by the invention.As shown in Figure 2, the difference of the present embodiment filtering power divider structure and the first embodiment filtering power divider structure is: the first open circuited transmission line 9, second open circuited transmission line 10, the 3rd open circuited transmission line 11 and the 4th open circuited transmission line 12 are arranged at the outside of rectangle branched structure and are one article of horizontal line section, and the first branch transmission line 13 and the second branch transmission line 14 are also arranged at the outside of rectangle branched structure.
Should be understood that according to actual design needs, in the present invention, can be optionally provided at its inner portion by any transmission line be connected with rectangle branched structure or outside, equally, it is inner or outside that isolation resistance 16 also optionally can be arranged on rectangle branched structure.
In the present embodiment, compared with the first embodiment, the outside first open circuited transmission line 9, second open circuited transmission line 10, the 3rd open circuited transmission line 11 and the 4th open circuited transmission line 12 being arranged at rectangle branched structure can increase the size of filtering power splitter, but also simplify the structure of 4 open circuited transmission lines simultaneously.And, open circuited transmission line and also can not there is interference phenomenon again between the first branch transmission line 13 and the second branch transmission line 14, more be conducive to the first branch transmission line 13 and the second branch transmission line 14 to be designed to open circuited transmission line, thus make filtering power splitter have better bandwidth.
Referring to Fig. 3-5, Fig. 3 is the first embodiment balance-unbalanced filtering power splitter principle schematic provided by the invention.As shown in Figure 3, the present embodiment will set forth the principle of balance provided by the invention-unbalanced filtering power splitter from circuit, therefore, in order to layout is convenient, open circuited transmission line 9,10,11 and 12 is specially arranged at the outside of rectangle branched structure by the present embodiment, because whether open circuited transmission line 9,10,11 and 12 can't affect the electrical property of filtering power splitter in the inside of rectangle branched structure, just structure and size can be affected.
As shown in Figure 3, the characteristic impedance of the first transmission line 5 is Z
1, 1/2nd wavelength of frequency centered by electrical length.The characteristic impedance of the second transmission line 6 and the 3rd transmission line 7 is Z
3, electrical length is 2 θ
2.The characteristic impedance of the 4th transmission line 8 is Z
2, 1/2nd wavelength of frequency centered by electrical length.The characteristic impedance of open circuited transmission line 9,10,11 and 12 is Z
3, electrical length is θ
1.The characteristic impedance of branch transmission line 13 and 14 is Z
3, electrical length is θ
3.The characteristic impedance of isolation transmission line 15 is Z
4, electrical length is θ
4.The resistance value of isolation resistance 16 is R.Balanced type input port A comprises input transmission line 2 and 4.Total is a symmetrical structure, and line of symmetry as shown in phantom in Figure 2.Export two unbalanced Single-end output ports that transmission line 1 and 3 then constitutes filtering power splitter.
During work, by adding the first transmission line 5 of 1/2nd wavelength between input port 2 and 4, can realize at balanced type input port A place's feed-in differential signal; Again by adding θ
1, θ
2and θ
3transmission line minor matters make the differential signal of balanced type input port A feed-in be evenly distributed to unbalanced Single-end output port one and 3, and then achieve power dividing function simultaneously produce filter function.Meanwhile, by adding the isolation that the 3rd transmission line 7 of 1/2nd wavelength, isolation transmission line 15 and the isolation resistance 16 of ground connection can realize between Single-end output port one and 3 between unbalanced Single-end output port one and 3.
For a power splitter, usually need to consider some specific performance index, such as port match, power decile and transmit port isolation.These three performance index S parameter represent, can be expressed as: S
ddAA<-20dB; S
dsA1=S
dsA3=-3dB; S
ss31<-20dB.According to these S parameter, can determine further again:
tanθ
1tanθ
2(2tanθ
3+tanθ
2)＝tanθ
3+tanθ
2-tan
2θ
2tanθ
3(3)
Wherein Z
0for the characteristic impedance of I/O transmission line 1,2,3 and 4, usual value is 50 Ω.For convenience of calculating, Z
350 Ω are generally with the value of R.
Preferably, the electrical length θ of open circuited transmission line 9,10,11 and 12
1the frequency of the transmission zero of adjustable filtering power splitter.In the present invention, θ
1for 1/4th of the wavelength at frequency place, transmission zero place.Therefore, θ can be determined by known transmission zero frequency
1, also can by selecting θ
1value control the transmission zero frequency of power splitter.On this basis, can formula (1) and (3) be passed through, regulate θ
2and θ
3the 1-dB bandwidth sum Out-of-band rejection of filtering power splitter can be controlled.In the present invention, along with θ
3increase bandwidth also thereupon increase until S
ddAAcentre frequency place to-20dB.
Preferably, the characteristic impedance Z of the first transmission line 5
1the bandwidth of the common mode inhibition of adjustable filtering power splitter.That is, the common mode inhibition bandwidth requirement by suppressing determines Z
1value or by regulate Z
1value design the filtering power splitter of specific common mode inhibition bandwidth.In the present invention, along with Z
1increase, the bandwidth of the common mode inhibition of circuit can reduce thereupon.
Preferably, the isolation magnitude of filtering power splitter provided by the invention and isolation frequency can regulate respectively by the electrical length of the width of the 3rd transmission line 7 and isolation transmission line 15.
In a preferred embodiment provided by the invention, balance-unbalanced filtering power splitter operating frequency is 1.88GHz, and have a transmission zero near 2.1GHz, 1-dB bandwidth is 7.5%, the coupling S of input
ddAAat centre frequency place to-20dB, common mode inhibition reaches 20dB and isolation reaches 15dB.First and the 3rd length of transmission line l
1=47.2mm, first to fourth open-circuit transfer line length l
2=22mm, second and the 4th length of transmission line l
3=9mm, the first and second open-circuit transfer line length l
4=2mm, isolation length of transmission line l
5=1.75mm, the first transmission line width w
1=1.4mm, first to fourth open-circuit transfer line width w
2=1mm, the 3rd transmission line width w
3=0.5mm.Fig. 4 and Fig. 5 is differential-mode response figure and the common-mode response figure of the balance-unbalanced filtering power splitter designed according to this dimensional parameters respectively.The comparing result of actual measurement S parameter and emulation S parameter is given in figure.
As can be seen from Figure 4, the amplitude of Single-end output port one and 3 near centre frequency | S
ds1A|=| S
ds3A|=-3dB, that is input power is assigned to Single-end output port one and 3 fifty-fifty.And near centre frequency, showing obvious bandpass characteristics, the outside S amplitude of centre frequency sharply declines.Therefore, power splitter shows obviously band-pass filtering property.And the isolation parameters between Single-end output port one and 3 | S
ss31| substantially all below-15dB, isolation characteristic meets design requirement completely.And port match parameter | S
ddAA| be-40dB at centre frequency place, then at below-20dB in the logical scope of band.Port match characteristic is good.
As can be seen from Figure 5, common mode inhibition parameter | S
ccAA| amplitude be 0dB substantially, the common-mode signal of filtering power splitter is substantially completely suppressed.As analyzed in Fig. 4, in Fig. 5, the isolation of common-mode signal meets design requirement equally.
As can be seen from the above analysis, the balance-non-equilibrium filtering power splitter of the present invention's design can meet design requirement completely.In addition, it can also be seen that from figure, actual measurement S parameter and emulation S parameter overlap substantially completely.This fully demonstrates the validity of the stuctures and properties of balance provided by the present invention-unbalanced filtering power splitter, also demonstrates each transmission line modular construction of balance provided by the invention-unbalanced filtering power splitter and the validity of function simultaneously.According to the function of structure provided by the invention and transmission line parts, those skilled in the art can design work at various frequencies, meet the different balance-unbalanced filtering power splitter of various characterisitic parameter.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly the interest field of the present invention can not be limited with this, one of ordinary skill in the art will appreciate that all or part of flow process realizing above-described embodiment, and according to the equivalent variations that the claims in the present invention are done, still belong to the scope that invention is contained.
Claims (10)
1. a balance-unbalanced filtering power splitter, it is characterized in that, comprise: first input end transmission line (2), second input transmission line (4), first output transmission line (1), second output transmission line (3), first transmission line (5), second transmission line (6), 3rd transmission line (7), 4th transmission line (8), first open circuited transmission line (9), second open circuited transmission line (10), 3rd open circuited transmission line (11), 4th open circuited transmission line (12), first branch transmission line (13), second branch transmission line (14), isolation transmission line (15) and isolation resistance (16), wherein,
Described first transmission line (5), the second transmission line (6), the 3rd transmission line (7) and the 4th transmission line (8) head and the tail connect and compose a rectangle branch line structure successively, the electrical length of described first transmission line (5) and described 3rd transmission line (7) is 1/2nd wavelength of centre frequency, and described second transmission line (6) is all identical with impedance with the electrical length of described 4th transmission line (8);
Described first open circuited transmission line (9), the second open circuited transmission line (10), the 3rd open circuited transmission line (11) and the 4th open circuited transmission line (12) have identical electrical length and impedance and its one end is connected to 4 summits of described rectangle branched structure, and the other end is opened a way;
Electrical length and the impedance of described first branch transmission line (13) and described second branch transmission line (14) are all identical; One end of described first branch transmission line (13) is connected to the mid point of described second transmission line (6), other end ground connection; One end of described second branch transmission line (14) is connected to the mid point of described 4th transmission line (8), other end ground connection; Described first branch transmission line (13), the first open circuited transmission line (9) are identical with the impedance of the second transmission line (6);
One end of described isolation transmission line (15) is connected to the mid point of described 3rd transmission line (7), and the other end is opened a way;
One end of described isolation resistance (16) is connected to the mid point of described 3rd transmission line (7), other end ground connection;
Described first input end transmission line (2) and described second input transmission line (4) form the balanced type input port of described filtering power splitter, are connected to the two ends of described first transmission line (5) respectively;
The Single-end output port that described first output transmission line (1) and described second output transmission line (3) are two unbalanceds of described filtering power splitter, is connected to the two ends of described 3rd transmission line (7) respectively;
Described first input end transmission line (2), the second input transmission line (4), the first output transmission line (1) are all identical with impedance with the electrical length of the second output transmission line (3).
2. balance according to claim 1-unbalanced filtering power splitter, it is characterized in that, described transmission line comprises microstrip transmission line and coplanar waveguide transmission line.
3. balance according to claim 1-unbalanced filtering power splitter, it is characterized in that, described first open circuited transmission line (9), the second open circuited transmission line (10), the 3rd open circuited transmission line (11) and the 4th open circuited transmission line (12) to be placed in described rectangle branched structure and to be formed by connecting by an oblique line section transmission line and a horizontal segment transmission line two sections of transmission lines; Wherein, described oblique line section transmission line is connected to the summit of described rectangle branched structure, and described horizontal segment transmission line is opened a way and is parallel to described first transmission line (5); The electrical length of the described horizontal segment transmission line of described first open circuited transmission line (9), the second open circuited transmission line (10), the 3rd open circuited transmission line (11) and the 4th open circuited transmission line (12) is equal.
4. balance according to claim 1-unbalanced filtering power splitter, it is characterized in that, described first input end transmission line (2), second input transmission line (4), first output transmission line (1) and the second output transmission line (3) are arranged at the outside of described rectangle branched structure, described first output transmission line (1) and described first input end transmission line (2) extend along the length direction of described second transmission line (6), described second output transmission line (3) and described second input transmission line (4) extend along the length direction of described 4th transmission line (8).
5. balance according to claim 1-unbalanced filtering power splitter, it is characterized in that, described first branch transmission line (13) and described second branch transmission line (14) are for open circuited transmission line or short-circuited transmission line and be placed in described rectangle branched structure.
6. balance according to claim 1-unbalanced filtering power splitter, it is characterized in that, the electrical length of described first open circuited transmission line (9), the second open circuited transmission line (10), the 3rd open circuited transmission line (11) and the 4th open circuited transmission line (12) is for regulating the frequency of the transmission zero of described filtering power splitter.
7. balance according to claim 6-unbalanced filtering power splitter, it is characterized in that, the electrical length of described second transmission line (6) and described first branch transmission line (13) is used for the 1-dB bandwidth sum Out-of-band rejection being regulated described filtering power splitter by following formula:
tanθ
1tanθ
2(2tanθ
3+tanθ
2)＝tanθ
3+tanθ
2-tan
2θ
2tanθ
3
Wherein, Z
0for the impedance of described first output transmission line (1), Z
3for the impedance of described second transmission line (6), θ
1for the electrical length of described first open circuited transmission line (9), θ
2for the half of the electrical length of described second transmission line (6), θ
3for the electrical length of described first branch transmission line (13).
8. balance according to claim 1-unbalanced filtering power splitter, is characterized in that, the impedance of described 3rd transmission line (7) and described isolation resistance (16) resistance are used for being selected by following formula:
Wherein, Z
0for the impedance of described first output transmission line (1), Z
2for the impedance of described 3rd transmission line (7), R is the resistance of described isolation resistance (16).
9. balance according to claim 1-unbalanced filtering power splitter, is characterized in that, the impedance of described first transmission line (5) is for regulating the common mode inhibition bandwidth of described filtering power splitter.
10. balance according to claim 1-unbalanced filtering power splitter, is characterized in that, the width of described 3rd transmission line (7) is for regulating the isolation magnitude of described filtering power splitter; The electrical length of described isolation transmission line (15) is for regulating the isolation frequency of described filtering power splitter.
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| CN105932391A (en) * | 2016-05-26 | 2016-09-07 | 南通大学 | Multi-level balanced type-single ended anti-phase power divider |
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| CN116054772A (en) * | 2023-02-27 | 2023-05-02 | 南通大学 | Wide common mode rejection balanced band-pass filter |
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