CN112133992B - Filtering power divider with high out-of-band rejection and full-band absorption functions - Google Patents

Filtering power divider with high out-of-band rejection and full-band absorption functions Download PDF

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CN112133992B
CN112133992B CN202011102843.4A CN202011102843A CN112133992B CN 112133992 B CN112133992 B CN 112133992B CN 202011102843 A CN202011102843 A CN 202011102843A CN 112133992 B CN112133992 B CN 112133992B
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line
branch
absorption
coupled line
power divider
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CN112133992A (en
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吴永乐
张一凡
闫婕
王卫民
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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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
    • 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
    • H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies

Abstract

The embodiment of the invention provides a filtering power divider with high out-of-band rejection and full-band absorption functions, relates to the technical field of electricity, and can improve the performance of a communication system. In a filtering power dividing circuit of the filtering power divider, a first port 1 is connected with one end of a first absorption branch S1 and one end of a first branch t 1; the other end of the first branch t1 is connected with one end of the first coupled line C1b and one end of the second coupled line C2 a; the other end of the first coupling line C1b is connected with one end of the second absorption branch S2; one end of the first coupled line C1a line is connected with one end of the third coupled line C3a line, and one end of the third coupled line C3b line is connected with the second port 2; the other end of the second coupling line C2a is connected with one end of the third absorption branch S3; one end of the second coupled line C2b line is connected to one end of the fourth coupled line C4b line, and one end of the fourth coupled line C4a line is connected to the third port 3.

Description

Filtering power divider with high out-of-band rejection and full-band absorption functions
Technical Field
The invention relates to the technical field of electricity, in particular to a filtering power divider with high out-of-band rejection and full-band absorption functions.
Background
At present, with the rapid development of microwave communication technology, a power divider (abbreviated as a power divider) is widely applied to antenna feed networks of wireless communication, satellite navigation systems and the like as one of key devices. A common power divider is a three-port device, and a signal and power are input from one port and then redistributed to the remaining two ports, which is an important passive power divider.
Power dividers are often connected to systems such as amplifiers and antenna arrays, and unwanted signals (i.e., noise) input to the power dividers are reflected through the input ports into the systems connected to the power dividers and cause intermodulation interference with nonlinear elements in these systems. The non-linear elements such as the amplifier have high sensitivity to noise, and the reflected signal has a large influence on the performance of the non-linear system, so that the sensitivity and the signal-to-noise ratio of the communication system are reduced, and the performance of the communication system is seriously influenced.
Disclosure of Invention
Embodiments of the present invention provide a filter power divider with high out-of-band rejection and full-band absorption functions, so as to reduce reflection noise in a communication system and improve performance of the communication system. The specific technical scheme is as follows:
the embodiment of the invention provides a filtering power divider with high out-of-band rejection and full-band absorption functions, which comprises: the filter power divider comprises a dielectric substrate and a filter power dividing circuit arranged on the upper surface of the dielectric substrate; wherein the content of the first and second substances,
the filtering power dividing circuit comprises: a first port 1, a second port 2, a third port 3, a first branch t1, a first coupled line C1, a second coupled line C2, a third coupled line C3, a fourth coupled line C4, a first absorption branch S1, a second absorption branch S2, and a third absorption branch S3; each coupled line comprises an a line and a b line, and the first absorption branch S1, the second absorption branch S2 and the third absorption branch S3 are used for absorbing noise reflected into the first port 1;
the first port 1 is connected with one end of a first absorption branch S1 and one end of a first branch t1, and the other end of the first absorption branch S1 is grounded;
the other end of the first branch t1 is connected with one end of the first coupled line C1b line and one end of the second coupled line C2a line;
the other end of the first coupling line C1b is connected with one end of the second absorption branch S2, and the other end of the second absorption branch S2 is grounded;
one end of the first coupled line C1a line is connected with one end of the third coupled line C3a line, and one end of the third coupled line C3b line is connected with the second port 2;
the other end of the second coupling line C2a is connected with one end of the third absorption branch S3, and the other end of the third absorption branch S3 is grounded;
one end of the second coupled line C2b line is connected to one end of the fourth coupled line C4b line, and one end of the fourth coupled line C4a line is connected to the third port 3.
Optionally, the first absorption branch S1 includes a first resistor R11 and a first short-circuit branch S11 connected in series, and the first short-circuit branch S11 is grounded;
the second absorption branch S2 comprises a second resistor R21 and a second short-circuit branch S21 which are connected in series, and the second short-circuit branch S21 is grounded;
the third absorption branch S3 includes a third resistor R31 and a third short-circuit branch S31 connected in series, and the third short-circuit branch S31 is grounded.
Optionally, the filtering power dividing circuit further includes: a first half-wavelength open stub K1 and a second half-wavelength open stub K2;
one end of the first coupling line C1a is also connected with the first half-wavelength open-circuit stub K1;
one end of the second coupling line C2b is also connected with the second half-wavelength open-circuit stub K2.
Optionally, the filtering power dividing circuit further includes: an isolation resistor R3;
the other end of the first coupling line C1b is also connected with one end of the isolation resistor R3;
the other end of the second coupling line C2a is also connected to the other end of the isolation resistor R3.
Optionally, the even mode impedance of the first coupling line C1 and the second coupling line C2 are the same, and the odd mode impedance is the same;
the even mode impedance of the third coupled line C3 and the fourth coupled line C4 are the same, and the odd mode impedance is the same.
Optionally, the first coupled line C1, the second coupled line C2, the third coupled line C3 and the fourth coupled line C4 have the same electrical length.
Optionally, the first half-wavelength open-circuit stub K1 and the second half-wavelength open-circuit stub K2 have the same characteristic impedance.
Optionally, the characteristic impedances of the second short-circuit branch S21 of the second absorption branch S2 and the third short-circuit branch S31 of the third absorption branch S3 are the same.
Optionally, the characteristic impedances of the first short-circuit branch S11 of the first absorption branch S1, the second short-circuit branch S21 of the second absorption branch S2, and the first branch t1 are different.
Optionally, the filtering power divider further includes: the metal layer covers the lower surface of the dielectric substrate and is grounded;
the first, second, and third absorption branches S1, S2, and S3 further include through holes connecting the metal layers.
According to the filtering power divider with the functions of high out-of-band rejection and full-band absorption provided by the embodiment of the invention, the three absorption branches can absorb noise reflected into the first port, namely, the three absorption branches can absorb signals reflected by the input port, so that the interference of the reflected signals to a communication system is reduced, the sensitivity and the signal-to-noise ratio of the communication system are improved, and the performance of the communication system is improved.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
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, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a filtering power divider according to an embodiment of the present invention;
fig. 2a is a schematic circuit structure diagram of a filtering power divider according to an embodiment of the present invention, where the central operating frequency is 1.75 GHz;
fig. 2b is a schematic diagram of a local circuit structure at a connection between a first port and a first absorption branch of a filtering power divider according to an embodiment of the present invention;
fig. 2c is a schematic diagram of a partial circuit structure at a connection position of an isolation resistor, a second absorption branch and a third absorption branch of the filtering power divider according to the embodiment of the present invention;
fig. 3 is a schematic diagram of a simulation result of a reflection coefficient of any one output port and a transmission coefficient of the filtering power divider when an input port of the filtering power divider is excited at a center operating frequency of 1.75GHz according to the embodiment of the present invention;
fig. 4 is a schematic diagram of a simulation result of a matching coefficient of any one output port and an isolation coefficient between two output ports when an input port of the filtering power divider provided by the embodiment of the present invention is excited at a center operating frequency of 1.75 GHz.
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 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.
In order to reduce reflection noise in a communication system and improve performance of the communication system, an embodiment of the present invention provides a filtering power divider with high out-of-band rejection and full-band absorption functions, as shown in fig. 1, the filtering power divider includes: the filter power dividing circuit comprises a dielectric substrate and a filter power dividing circuit arranged on the upper surface of the dielectric substrate; wherein the content of the first and second substances,
the filtering power dividing circuit comprises: a first port 1, a second port 2, a third port 3, a first branch t1, a first coupled line C1, a second coupled line C2, a third coupled line C3, a fourth coupled line C4, a first absorption branch S1, a second absorption branch S2, and a third absorption branch S3; each coupled line includes a-line and b-line, and the first absorption branch S1, the second absorption branch S2, and the third absorption branch S3 are used to absorb noise reflected into the first port 1.
The first port 1 is connected to one end of the first absorption branch S1 and one end of the first branch t1, and the other end of the first absorption branch S1 is grounded. It can be seen that the first absorption branch S1 is in parallel with the first port 1, and the first absorption branch S1 is in parallel with the first branch t 1.
The other end of the first branch t1 is connected to one end of the first coupled line C1b and one end of the second coupled line C2 a.
The other end of the first coupling line C1b is connected to one end of the second absorption branch S2, and the other end of the second absorption branch S2 is grounded. It can be seen that the second absorption branch S2 is wired in parallel with the first coupled line C1 b.
One end of the first coupled line C1a is connected to one end of the third coupled line C3a, and one end of the third coupled line C3b is connected to the second port 2.
The other end of the second coupling line C2a is connected to one end of the third absorption branch S3, and the other end of the third absorption branch S3 is grounded. It can be seen that the third absorption branch S3 is wired in parallel with the second coupled line C2 a.
One end of the second coupled line C2b is connected to one end of the fourth coupled line C4b, and one end of the fourth coupled line C4a is connected to the third port 3.
According to the filtering power divider with the functions of high out-of-band rejection and full-band absorption provided by the embodiment of the invention, the three absorption branches can absorb noise reflected into the first port, namely, the three absorption branches can absorb signals reflected by the input port, so that the interference of the reflected signals to a communication system is reduced, the sensitivity and the signal-to-noise ratio of the communication system are improved, and the performance of the communication system is improved.
In the embodiment of the present invention, the first port 1 may be an input port, and the second port 2 and the third port 3 may be output ports. Optionally, the input port and the output port may be SubMiniature version a (SMA) connectors. The SMA is a coaxial radio frequency connector and can be used as a minimum connector interface of a coaxial cable with a spiral coupling structure.
In this embodiment of the present invention, the filtering power dividing circuit further includes: isolation resistor R3.
The other end of the first coupling line C1b is also connected with one end of an isolation resistor R3; the other end of the second coupling line C2a is also connected to the other end of the isolation resistor R3.
In the embodiment of the present invention, the isolation resistor R3 is connected in series between the first coupling line C1 and the second coupling line C2, and the isolation resistor R3 can effectively isolate signals output by two output ports, that is, isolate signals output by the second port 2 and the third port 3, and has good in-pass band isolation performance.
Referring to fig. 1, each absorption branch may include a resistor and a quarter-wavelength short-circuit branch connected in series, where the resistor may absorb signals and power in a heat dissipation manner, the short-circuit branch is grounded, and the short-circuit branch is equivalent to an open circuit at the operating frequency of the filtering power divider, so that the absorption branch may absorb reflected signals without affecting the normal operation of the filtering power divider.
Specifically, the first absorption branch S1 includes a first resistor R11 and a first short-circuit branch S11 connected in series, and the first short-circuit branch S11 is grounded.
The second absorption branch S2 includes a second resistor R21 and a second short-circuit branch S21 connected in series, and the second short-circuit branch S21 is grounded.
The third absorption branch S3 includes a third resistor R31 and a third short-circuit branch S31 connected in series, and the third short-circuit branch S31 is grounded.
According to the embodiment of the invention, two absorption branches are connected in parallel at the tail ends of the first port 1 and the isolation resistor R3 of the filtering power divider, the absorption branches are formed by connecting resistors and short-circuited quarter-wavelength branches in series, and the resistors in the three absorption branches can absorb input power and signals input into an out-of-band area of the first port, so that a full-band absorption function is realized, and interference on the performance of a communication system caused by reflection of useless signals to equipment connected with the filtering power divider is avoided. And the effect of changing the absorption degree of the absorption and reflection signals can be achieved by adjusting the value of the resistance in the absorption branch.
Referring to fig. 1, the filtering power dividing circuit in the embodiment of the present invention may further include: a first half-wavelength open stub K1 and a second half-wavelength open stub K2.
One end of the first coupling line C1a is also connected to the first half-wavelength open stub K1. It can be seen that the first half-wavelength open stub K1 is wired in parallel with the first coupled line C1a, and the first half-wavelength open stub K1 is wired in parallel with the third coupled line C3 a.
One end of the second coupling line C2b is also connected with a second half-wavelength open-circuit branch K2. It can be seen that the second half-wavelength open stub K2 is line-connected in parallel with the second coupled line C2b, and the second half-wavelength open stub K2 is line-connected in parallel with the fourth coupled line C4 b.
In the embodiment of the invention, the half-wavelength open-circuit branch is introduced, so that the suppression of out-of-band useless signals is promoted, a plurality of transmission zeros are arranged out of band, a plurality of transmission poles are arranged in the in-band, the out-of-band suppression is enhanced, the out-of-band isolation performance is good, and the filtering frequency range is wider. By adjusting the impedance of the half-wavelength open-circuit branch, the effect of independently adjusting the passband bandwidth of the filtering power divider can be achieved, and the bandwidth expansion and the filtering selectivity improvement are realized.
In one embodiment of the present invention, the even mode impedances of the first and second coupled lines C1 and C2 are the same, and the odd mode impedances are the same. As shown in FIG. 1, the even mode impedance of the first coupled line C1 and the second coupled line C2 is Ze1Odd mode impedance of Zo1。
The even mode impedance of the third coupled line C3 and the fourth coupled line C4 are the same, and the odd mode impedance is the same. As shown in FIG. 1, the even-mode impedance of the third coupled line C3 and the fourth coupled line C4 is Ze2Odd mode impedance of Zo2。
Accordingly, the line width, interval and line length of the first coupled line C1 and the second coupled line C2 are the same; the third coupled line C3 and the fourth coupled line C4 have the same line width, interval and line length. The line width refers to the line width of each line in the coupled line, the interval refers to the interval between the line a and the line b in the coupled line, and the line length refers to the line length of each line in the coupled line.
In one embodiment of the present invention, the electrical lengths of the first coupled line C1, the second coupled line C2, the third coupled line C3 and the fourth coupled line C4 are the same. Optionally, the electrical length θ of the first coupled line C1, the second coupled line C2, the third coupled line C3, and the fourth coupled line C4 is 90 °.
In one embodiment of the present invention, the first half-wavelength open stub K1 and the second half-wavelength open stub K2 have the same characteristic impedance. The characteristic impedance of the first half-wavelength open-circuit branch K1 and the second half-wavelength open-circuit branch K2 is Zs2And the electrical length of the first half-wavelength open stub K1 and the second half-wavelength open stub K2 is 180 °.
In one embodiment of the present invention, the characteristic impedances of the second short branch S21 of the second absorption branch S2 and the third short branch S31 of the third absorption branch S3 are the same. The characteristic impedance of the second short-circuit branch S21 and the third short-circuit branch S31 is Zs3And an electrical length of 90. Accordingly, the second short-circuit branch S21 and the third short-circuit branch S31 have the same line width and length.
In one embodiment of the invention, the characteristic impedance Z of the first short-circuit branch S11s1Characteristic impedance Z of second short-circuit branch S21s3And the characteristic impedance Z of the first branch t1t1Are not identical.
Accordingly, the first short-circuit branch S11, the second short-circuit branch S21, and the first branch t1 have different line widths and lengths.
Optionally, the electrical lengths of the first short-circuit branch S11, the second short-circuit branch S21, the third short-circuit branch S31, and the first branch t1 are 90 °.
It can be seen that the circuit structure of the filtering power divider provided by the embodiment of the invention is a vertically symmetrical structure, and has the characteristics of simple structure and easiness in processing.
The embodiment of the invention can be realized by adopting a design method of a single-layer printed circuit board, namely, the upper surface of the dielectric substrate can be printed with a filtering power dividing circuit, and the lower surface can be covered with a grounded metal layer. Optionally, the type of the dielectric substrate can be TaconicCER-10, the dielectric constant is 10, the thickness is 1.6mm, and the dielectric loss is 0.0035.
The first absorption branch S1, the second absorption branch S2 and the third absorption branch S3 further include through holes for connecting the metal layers, so that one ends of the three absorption branches are grounded.
The filtering power divider provided by the embodiment of the invention has small size and wider passband bandwidth, and meets the miniaturization trend of a communication system and the requirement on the bandwidth. The whole filtering power divider is a simple plane structure and has easy realizability, and due to the structure, the multifunctional multiplexing is realized, so that the performance of a radio frequency system can be effectively improved, the influence of reflection noise on the system is reduced, the complexity of a microwave system is reduced, and the performance of the system is obviously improved.
To facilitate illustration and to accommodate current communications band requirements, embodiments of the present invention illustratively provide an embodiment having a center frequency of 1.75 GigaHertz (GHz). In this example, the dielectric substrate was selected to have a type of TaconicCER-10, a dielectric constant of 10, a thickness of 1.6 millimeters (mm), and a dielectric loss of 0.0035. The upper surface of the dielectric substrate is provided with a filtering power divider circuit, and the lower surface of the dielectric substrate is covered with grounded metal to be used as the ground.
Fig. 2a is a schematic circuit structure diagram of a filtering power divider provided in an embodiment of the present invention at a center operating frequency of 1.75GHz, fig. 2b is a schematic partial circuit structure diagram of a connection between a first port of the filtering power divider and a first absorption branch, and fig. 2c is a schematic partial circuit structure diagram of a connection between an isolation resistor of the filtering power divider and second and third absorption branches.
In this embodiment, the characteristic impedances of the first, second and third ports are each 50 ohms (Ω). As shown in fig. 2 a-2 c, the three port width Wp is 2mm and the three port length lp is 16.4 mm. The first and second coupled lines C1 and C2 have a line width We10.1mm, gap width (spacing) Se10.1mm, length le1Is 18.9 mm. Third coupled line C3 and fourth coupled line C4 have a line width We2Is 0.2mm, and has a gap width Se20.3mm, length le2Is 18.1 mm. Width W of first half-wavelength open stub K1 and second half-wavelength open stub K2s2Is 3.8mm, length ls2Is 34.3 mm. Width W of first branch t1tIs 1.3mm, length lt1Is 15 mm. The isolation resistor R3 has a resistance value of R3＝270Ω。
In FIGS. 2 a-2 c, the two parallel-connected absorption branches connected to the first port 1 are equivalent toFirst branch S1. Resistance value R of first resistor R11 in first absorption branch S11145 Ω, line width Ws1Is 0.8mm, length ls115.2mm, the first absorption branch S1 line is grounded through the grounding hole. Resistance value R in the second absorption branch S2 and the third absorption branch S32135 Ω, line width Ws3Is 1.1mm, length ls315.4mm, and is grounded through the grounding hole.
FIG. 3 shows a reflection coefficient S of any output port of the filtering power divider according to the embodiment of the present invention when the input port is excited at a center operating frequency of 1.75GHz11Transmission coefficient S of filter power divider21The simulation result of (1) is shown schematically. The input port is a first port, and the output port is a second port and a third port. Reflection coefficient S of any one output port11Which may also be referred to as the return loss of the filter. Transmission coefficient S21Which may also be referred to as insertion loss. Curve with squares is S11With a circular curve S21。
When the input port is excited, the insertion loss S of the filter power divider at 1.75GHz is realized when the central working frequency is 1.75GHz21Is-3.86 decibel (dB), and the filter power divider can realize the absorption of the reflected signal of the input port of full frequency and return loss S in the pass band11The range of less than-10 dB is 1.21GHz to 2.30 GHz. In particular if the absorption of the filter power divider is defined as the return loss S11And the power divider is smaller than-10 dB, and can realize the absorption of the reflected signals outside the passband range, and can realize the effective absorption of the reflected signals in the full frequency range. Meanwhile, the filtering power divider can effectively inhibit the depth of out-of-band transmission signals, and the inhibition depth is 22 dB.
FIG. 4 shows a matching coefficient S of any output port when the input port of the filter power divider is excited at a center operating frequency of 1.75GHz in the embodiment of the present invention22Isolation factor S between two output ports23The simulation result of (1) is shown schematically. The input port is a first port, and the output port is a second port and a third port. With triangular curveThe line is S22The curve with five stars is S23。
Isolation factor S in passband23Greater than 14.3dB, and out-of-pass band isolation coefficient S23And if the output voltage is larger than 15dB, the two output ports of the filtering power divider have better isolation performance. Matching coefficient S of any one output port22The range of less than-10 dB is 1.10GHz to 2.30GHz, and the passband cut-off frequency has two poles, which shows that the two output ports of the filter power divider have good matching performance.
The size of the filtering power dividing circuit provided by the embodiment of the invention can be designed to be 69mm multiplied by 52mm, and the filtering power dividing circuit has the characteristics of miniaturization and easy integration. The filtering power divider with the functions of deep out-of-band rejection and full frequency absorption provided by the embodiment of the invention can be widely applied to various microwave systems, accords with the trend of miniaturization of systems and devices, can reduce the interference to a communication system, and has wide application prospect.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (9)

1. A filter power divider with high out-of-band rejection and full-band absorption, comprising: the filter power divider comprises a dielectric substrate and a filter power dividing circuit arranged on the upper surface of the dielectric substrate; wherein the content of the first and second substances,
the filtering power dividing circuit comprises: a first port (1), a second port (2), a third port (3), a first stub (t1), a first coupled line (C1), a second coupled line (C2), a third coupled line (C3), a fourth coupled line (C4), a first absorption stub (S1), a second absorption stub (S2), and a third absorption stub (S3); each coupled line comprises an a-line and a b-line, the first (S1), second (S2) and third (S3) absorbing stub being for absorbing noise reflected into the first port (1); the first absorption branch (S1) comprises a first resistor (R11) and a first short-circuit branch (S11) which are connected in series, and the first short-circuit branch (S11) is grounded; the second absorption branch (S2) comprises a second resistor (R21) and a second short-circuit branch (S21) which are connected in series, and the second short-circuit branch (S21) is grounded; the third absorption branch (S3) comprises a third resistor (R31) and a third short-circuit branch (S31) connected in series, the third short-circuit branch (S31) is grounded;
the first port (1) is connected with one end of a first absorption branch (S1) and one end of the first branch (t1), and the other end of the first absorption branch (S1) is grounded;
the other end of the first branch (t1) is connected with one end of the first coupled line (C1) b line and one end of the second coupled line (C2) a line;
the other end of the first coupling line (C1) b line is connected with one end of the second absorption branch (S2), and the other end of the second absorption branch (S2) is grounded;
one end of the first coupled line (C1) a line is connected with one end of the third coupled line (C3) a line, and one end of the third coupled line (C3) b line is connected with the second port (2);
the other end of the second coupling line (C2) a line is connected with one end of the third absorption branch (S3), and the other end of the third absorption branch (S3) is grounded;
one end of the second coupled line (C2) b line is connected with one end of the fourth coupled line (C4) b line, and one end of the fourth coupled line (C4) a line is connected with the third port (3).
2. The filtered power divider of claim 1, wherein the filtered power dividing circuit further comprises: a first half-wavelength open stub (K1) and a second half-wavelength open stub (K2);
one end of the first coupling line (C1) a is also connected with the first half-wavelength open-circuit stub (K1);
one end of the second coupling line (C2) b is also connected with the second half-wavelength open-circuit branch (K2).
3. The filtered power divider of claim 1, wherein the filtered power dividing circuit further comprises: an isolation resistor (R3);
the other end of the first coupling line (C1) b line is also connected with one end of the isolation resistor (R3);
the other end of the second coupling line (C2) a is also connected with the other end of the isolation resistor (R3).
4. The filtering power divider of claim 1, wherein the even mode impedance and the odd mode impedance of the first coupled line (C1) and the second coupled line (C2) are the same;
the even mode impedance of the third coupled line (C3) and the fourth coupled line (C4) are the same, and the odd mode impedance is the same.
5. The filtered power divider of claim 4, characterized in that the electrical lengths of the first coupled line (C1), the second coupled line (C2), the third coupled line (C3) and the fourth coupled line (C4) are the same.
6. The filtering power divider of claim 2, characterized in that the characteristic impedances of the first half-wavelength open stub (K1) and the second half-wavelength open stub (K2) are the same.
7. The filtering power divider of claim 6, wherein the characteristic impedances of the second short-circuit branch (S21) of the second absorption branch (S2) and the third short-circuit branch (S31) of the third absorption branch (S3) are the same.
8. The filtering power divider of claim 7, wherein the characteristic impedances of the first short-circuit branch (S11) of the first absorption branch (S1), the second short-circuit branch (S21) of the second absorption branch (S2) and the first branch (t1) are different.
9. The filtered power divider of claim 1, further comprising: the metal layer covers the lower surface of the dielectric substrate and is grounded;
the first absorption branch (S1), the second absorption branch (S2), and the third absorption branch (S3) further include a through hole connecting the metal layers.
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