CN110429363B - Three-passband power division filter based on multimode Y-shaped resonator - Google Patents
Three-passband power division filter based on multimode Y-shaped resonator Download PDFInfo
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- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
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- H01P1/201—Filters for transverse electromagnetic waves
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Abstract
The invention discloses a three-passband power division filter based on a multimode forked resonator, which comprises a dielectric substrate, wherein a metal grounding plate is arranged on the bottom surface of the dielectric substrate, an input port feeder, a first output feeder and a second output feeder are arranged on the top surface of the dielectric substrate, the input port feeder is positioned in the middle of the dielectric substrate, and the first output feeder and the second output feeder are respectively and symmetrically arranged on two sides of the input port feeder; a first fork-shaped three-mode resonator and a second fork-shaped three-mode resonator are respectively arranged between the input port feeder line and the first output feeder line; and a third fork-shaped three-mode resonator and a fourth fork-shaped three-mode resonator are respectively arranged between the input port feeder line and the second output feeder line.
Description
Technical Field
The invention relates to the technical field of microwave passive devices, in particular to a three-passband power division filter based on a multimode forked resonator.
Background
In modern wireless communication systems, a power divider and a filter are important rf front-end passive devices, and are often designed in a cascaded manner in order to implement power division and filtering functions at the same time, in this way, not only the volume of the circuit is increased, but also the performance of the circuit is reduced. Therefore, in recent years, research into a power divider with a filter response has been conducted in order to reduce the circuit size and improve the circuit performance. Meanwhile, with the continuous development of modern wireless communication systems, the demand for multiple communication systems is also increased.
Document 1[ k.j.song, m.y.fan, and f.zhang, "Compact Triple-Band Power Divider Integrated Band-gap-Filtering Using Short-circuit SIRs," IEEE trans.com. packag.manufact.technol., vol.7, No.7, july.2017] achieves three passband filter responses by coupling a Short-Circuited stepped impedance resonator and a half-wavelength resonator, and can simultaneously obtain three desired passbands by adjusting impedance ratios and electrical lengths. However, the circuit structure is complex, and the port isolation is high, so that the problem of poor out-of-band rejection affects the wide application of the power division filter.
In the document 2[ c. -f.chen, t. -. y.huang, and r. -. b.wu, "Novel reactive network-type resonators and the pair applications to microstrip baseband filters," IEEE trans.micro.theory technology, vol.54, No.2, pp.755-762, feb.2006], a multi-passband microstrip filter is simply and efficiently implemented by using a mesh three-mode resonator on the basis of not significantly increasing the circuit size, but due to the limitation of the freedom of design parameters, it is difficult to simultaneously implement the design requirements for all passbands, and the implementation difficulty of the design is increased.
Document 3[ R.G, Yu mez-Garcia, R.Loeches-Sanchez, D.Psychogiou, and D.Peroulis, "Single/Multi-band Wilkinson-type power divider with embedded transforming sections and application to channel filters," IEEE trans.circuits Syst.I, Reg.Papers, vol.62, No.6, pp.1518-1527, Jun.2015 ] proposes a new Single/multiple pass Wilkinson power divider with inherent filtering capability, but its circuit size is large and port isolation is poor.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of providing a three-passband power division filter based on a multimode forked resonator aiming at the defects of the prior art.
In order to solve the technical problem, the invention discloses a three-passband power division filter based on a multimode forked resonator, which comprises a dielectric substrate, wherein a metal grounding plate is arranged on the bottom surface of the dielectric substrate, an input port feeder, a first output feeder and a second output feeder are arranged on the top surface of the dielectric substrate, the input port feeder is positioned in the middle of the dielectric substrate, and the first output feeder and the second output feeder are respectively and symmetrically arranged on two sides of the input port feeder;
a first fork-shaped three-mode resonator and a second fork-shaped three-mode resonator are respectively arranged between the input port feeder line and the first output feeder line;
and a third fork-shaped three-mode resonator and a fourth fork-shaped three-mode resonator are respectively arranged between the input port feeder line and the second output feeder line.
In the invention, the input port feeder line comprises a first 50 ohm microstrip line conduction band and an input coupling line, one end of the first 50 ohm microstrip line conduction band is close to the first side edge of the dielectric substrate, and the other end of the first 50 ohm microstrip line conduction band is connected with the input coupling line; the connection position of the conduction band of the first 50 ohm microstrip line and the first side edge of the dielectric substrate is an input end.
In the invention, the first output feeder line consists of a second 50 ohm microstrip line conduction band and an L-shaped output coupling line, the second 50 ohm microstrip line conduction band is close to the second side edge of the dielectric substrate, the L-shaped output coupling line is connected with the second 50 ohm microstrip line conduction band, the L-shaped output coupling line is parallel to the input coupling line, and the second 50 ohm microstrip line conduction band is vertical to the input coupling line;
the connection position of the 50 ohm microstrip line conduction band and the second side edge of the dielectric substrate is a first output end.
In the invention, the second output feeder line consists of a third 50 ohm microstrip line conduction band and an L-shaped output coupling line, the third 50 ohm microstrip line conduction band is close to the third side edge of the dielectric substrate, the L-shaped output coupling line is connected with the third 50 ohm microstrip line conduction band, the L-shaped output coupling line is parallel to the input coupling line, and the third 50 ohm microstrip line conduction band is vertical to the input coupling line;
and the connection part of the 50 ohm microstrip line conduction band and the third side edge of the dielectric substrate is a third output end.
According to the invention, the first fork-shaped three-mode resonator comprises a first terminal short-circuit branch, a first terminal open-circuit branch, a second terminal open-circuit branch, a first fork-shaped terminal open-circuit branch and a first grounding pole;
one end of the first grounding column is connected with the end part of the first terminal short circuit branch section, and the other end of the first grounding column penetrates through the dielectric substrate and is connected to the metal grounding plate;
the first terminal open-circuit branch and the second terminal open-circuit branch are symmetrically arranged on two sides of the first terminal short-circuit branch respectively;
the first fork-shaped terminal open-circuit branch and the first terminal short-circuit branch are in the same straight line, and a first L-shaped terminal open-circuit branch and a second L-shaped terminal open-circuit branch are symmetrically arranged on two sides of the first fork-shaped terminal open-circuit branch respectively.
In the invention, the second fork-shaped three-mode resonator comprises a second terminal short-circuit branch, a third terminal open-circuit branch, a fourth terminal open-circuit branch, a second fork-shaped terminal open-circuit branch and a second grounding pole;
one end of the second grounding column is connected with the second terminal short circuit branch section, and the other end of the second grounding column penetrates through the dielectric substrate and is connected to the metal grounding plate;
the third terminal open-circuit branch and the fourth terminal open-circuit branch are symmetrically arranged on two sides of the second terminal short-circuit branch respectively;
the second forked terminal open-circuit branch and the second terminal short-circuit branch are in the same straight line, and a third L-shaped terminal open-circuit branch and a fourth L-shaped terminal open-circuit branch are symmetrically arranged on two sides of the second forked terminal open-circuit branch respectively.
In the invention, the third forked three-mode resonator comprises a third terminal short-circuit branch, a fifth terminal open-circuit branch, a sixth terminal open-circuit branch, a third forked terminal open-circuit branch and a third grounding pole;
one end of the third grounding column is connected with the third terminal short circuit branch section, and the other end of the third grounding column penetrates through the dielectric substrate and is connected to the metal grounding plate;
the fifth terminal open-circuit branch and the sixth terminal open-circuit branch are symmetrically arranged on two sides of the third terminal short-circuit branch respectively;
the third Y-shaped terminal open-circuit branch and the third terminal short-circuit branch are in the same straight line, and a fifth L-shaped terminal open-circuit branch and a sixth L-shaped terminal open-circuit branch are symmetrically arranged on two sides of the third Y-shaped terminal open-circuit branch respectively.
In the invention, the fourth fork-shaped three-mode resonator comprises a fourth terminal short-circuit branch, a seventh terminal open-circuit branch, an eighth terminal open-circuit branch, a fourth fork-shaped terminal open-circuit branch and a fourth grounding pole;
one end of the fourth grounding column is connected with the fourth terminal short circuit branch section, and the other end of the fourth grounding column penetrates through the dielectric substrate and is connected to the metal grounding plate;
the seventh terminal open-circuit branch and the eighth terminal open-circuit branch are symmetrically arranged on two sides of the fourth terminal short-circuit branch respectively;
the fourth fork-shaped terminal open-circuit branch and the fourth terminal short-circuit branch are in the same straight line, and a seventh L-shaped terminal open-circuit branch and an eighth L-shaped terminal open-circuit branch are symmetrically arranged on two sides of the fourth fork-shaped terminal open-circuit branch respectively.
In the invention, a first fork-shaped three-mode resonator and a third fork-shaped three-mode resonator are symmetrical on two sides of an input coupling line; the second fork-shaped three-mode resonator and the fourth fork-shaped three-mode resonator are symmetrical on two sides of the input coupling line;
the first fork-shaped three-mode resonator and the fourth fork-shaped three-mode resonator are arranged in a centrosymmetric manner;
the third fork-shaped three-mode resonator and the second fork-shaped three-mode resonator are arranged in a centrosymmetric mode.
The input port feeder line, the first output feeder line, the second output feeder line and the four fork-shaped three-mode resonators are compact in structure, can be realized on a single PCB, and are convenient to process and integrate and low in production cost.
The invention utilizes the electric field distribution characteristics of four fork-shaped three-mode resonators with the same structure and the main transmission line, and has high selectivity and multi-passband characteristics.
The invention utilizes the characteristics of coupling of a wavelength main transmission line and a resonator and zero point generation of an open-circuit branch, and has good out-of-band rejection characteristic.
The power division filter of the invention utilizes the isolation resistor connected between the resonators, has good port isolation and is suitable for modern wireless communication systems.
Has the advantages that: the invention processes and corrodes the metal surfaces of the front surface and the back surface of the circuit substrate in the manufacturing process of the printed circuit board, thereby forming the required metal pattern, having simple structure, being realized on a single PCB board, being convenient for processing and integrating and having low production cost. Meanwhile, good power distribution characteristics and filter characteristics are obtained by utilizing the multimode forked resonator and the network topology, and good port isolation characteristics are obtained by skillfully isolating the resistor between the resonators.
Drawings
The foregoing and/or other advantages of the invention will become further apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic perspective view of a three-passband power division filter based on a multimode fork resonator according to the present invention.
Fig. 2 is a front view of embodiment 1.
Fig. 3 is a schematic structural dimension diagram of example 1.
Fig. 4 is an S-parameter simulation diagram of example 1.
Fig. 5 is a simulation diagram of matching characteristics and isolation characteristics S-parameters of two output ports of embodiment 1.
Fig. 6 is a second S-parameter simulation diagram of example 1.
In the figure, an input port feeder line 1, a first output feeder line 2, a second output feeder line 3, a first fork-shaped three-mode resonator 4, a second fork-shaped three-mode resonator 5, a third fork-shaped three-mode resonator 6, a fourth fork-shaped three-mode resonator 7, a metal grounding plate 8, a rectangular dielectric substrate 9, and a first isolation resistor R1Second isolation resistor R2。
Detailed Description
Embodiment, as shown in fig. 1, the embodiment provides a three-passband power division filter based on a multimode fork resonator, which includes a dielectric substrate 9, a metal ground plate 8 is disposed on a bottom surface of the dielectric substrate 9, an input port feeder 1, a first output feeder 2, and a second output feeder 3 are disposed on a top surface of the dielectric substrate 9, the input port feeder 1 is located in a middle of the dielectric substrate 9, and the first output feeder 2 and the second output feeder 3 are symmetrically disposed on two sides of the input port feeder 1, respectively;
a first fork-shaped three-mode resonator 4 and a second fork-shaped three-mode resonator 6 are respectively arranged between the input port feeder line 1 and the first output feeder line 2;
a third fork-shaped three-mode resonator 5 and a fourth fork-shaped three-mode resonator 7 are respectively arranged between the input port feeder line 1 and the second output feeder line 3.
The input port feeder 1 comprises a first 50 ohm microstrip line conduction band 11 and an input coupling line 12, one end of the first 50 ohm microstrip line conduction band 11 is close to the first side edge 9a of the dielectric substrate 9, and the other end of the first 50 ohm microstrip line conduction band is connected with the input coupling line 12; the connection between the first 50 ohm microstrip conduction band 11 and the first side of the dielectric substrate 9 is an input end.
The first output feeder 2 consists of a second 50 ohm microstrip line conduction band 21 and an L-shaped output coupling line 22, the second 50 ohm microstrip line conduction band 21 is close to the second side edge 9b of the dielectric substrate 9, the L-shaped output coupling line 22 is connected with the second 50 ohm microstrip line conduction band 21, the L-shaped output coupling line 22 is parallel to the input coupling line 12, and the second 50 ohm microstrip line conduction band 21 is perpendicular to the input coupling line 12;
the connection between the 50 ohm microstrip conduction band 21 and the second side of the dielectric substrate 9 is a first output end.
A multi-mode fork resonator-based three-passband power division filter is characterized in that a second output feeder 3 consists of a third 50-ohm microstrip line conduction band 31 and an L-shaped output coupling line 32, the third 50-ohm microstrip line conduction band 31 is close to a third side edge 9c of a dielectric substrate 9, the L-shaped output coupling line 32 is connected with the third 50-ohm microstrip line conduction band 31, the L-shaped output coupling line 32 is parallel to an input coupling line 12, and the third 50-ohm microstrip line conduction band 31 is perpendicular to the input coupling line 12;
the connection between the 50 ohm microstrip conduction band 31 and the third side of the dielectric substrate 9 is a third output terminal.
The first fork-shaped three-mode resonator 4 comprises a first terminal short-circuit branch 41, a first terminal open-circuit branch 42, a second terminal open-circuit branch 43, a first fork-shaped terminal open-circuit branch 44 and a first grounding column 47;
one end of the first grounding post 47 is connected with the end of the first terminal short-circuit branch 41, and the other end is connected to the metal grounding plate 8 through the dielectric substrate 9;
the first terminal open-circuit branch 42 and the second terminal open-circuit branch 43 are symmetrically arranged at two sides of the first terminal short-circuit branch 41 respectively;
the first fork-shaped open-ended branch 44 and the first short-ended branch 41 are in the same straight line, and a first L-shaped open-ended branch 45 and a second L-shaped open-ended branch 46 are symmetrically arranged on two sides of the first fork-shaped open-ended branch 44 respectively.
The second fork-shaped three-mode resonator 5 comprises a second terminal short-circuit branch 51, a third terminal open-circuit branch 52, a fourth terminal open-circuit branch 53, a second fork-shaped terminal open-circuit branch 54 and a second grounding pole 57;
one end of the second grounding post 57 is connected to the second terminal short-circuit branch 51, and the other end passes through the dielectric substrate 9 and is connected to the metal grounding plate 8;
the third terminal open-circuit branch 52 and the fourth terminal open-circuit branch 53 are symmetrically arranged at two sides of the second terminal short-circuit branch 51 respectively;
the second forked terminal open-circuit branch 54 and the second terminal short-circuit branch 51 are in the same straight line, and a third L-shaped terminal open-circuit branch 55 and a fourth L-shaped terminal open-circuit branch 56 are symmetrically arranged on two sides of the second forked terminal open-circuit branch 54 respectively.
The third fork-shaped three-mode resonator 6 comprises a third terminal short-circuit branch 61, a fifth terminal open-circuit branch 62, a sixth terminal open-circuit branch 63, a third fork-shaped terminal open-circuit branch 64 and a third grounding column 67;
one end of the third grounding column 67 is connected with the third terminal short-circuit branch section 61, and the other end of the third grounding column penetrates through the dielectric substrate 9 and is connected to the metal grounding plate 8;
the fifth open-circuit terminal branch 62 and the sixth open-circuit terminal branch 63 are symmetrically arranged on two sides of the third short-circuit terminal branch 61 respectively;
the third trident-shaped terminal open-circuit branch 64 and the third terminal short-circuit branch 61 are in the same straight line, and a fifth L-shaped terminal open-circuit branch 65 and a sixth L-shaped terminal open-circuit branch 66 are symmetrically arranged on two sides of the third trident-shaped terminal open-circuit branch 64 respectively.
The fourth fork-shaped three-mode resonator 7 comprises a fourth terminal short-circuit stub 71, a seventh terminal open-circuit stub 72, an eighth terminal open-circuit stub 73, a fourth fork-shaped terminal open-circuit stub 74 and a fourth grounding post 77;
one end of the fourth grounding post 77 is connected with the fourth terminal short-circuit branch 71, and the other end thereof is connected to the metal grounding plate 8 through the dielectric substrate 9;
the seventh open-ended branch 72 and the eighth open-ended branch 73 are symmetrically arranged on two sides of the fourth short-ended branch 71 respectively;
the fourth fork-shaped open-ended branch 74 and the fourth short-ended branch 71 are in the same straight line, and a seventh L-shaped open-ended branch 75 and an eighth L-shaped open-ended branch 76 are symmetrically disposed on two sides of the fourth fork-shaped open-ended branch 74 respectively.
The first fork-shaped three-mode resonator 4 and the third fork-shaped three-mode resonator 5 are symmetrical on two sides of the input coupling line 12;
the second fork-shaped three-mode resonator 6 and the fourth fork-shaped three-mode resonator 7 are symmetrical on two sides of the input coupling line 12;
the first fork-shaped three-mode resonator 4 and the fourth fork-shaped three-mode resonator 7 are arranged in a centrosymmetric manner;
the third fork-shaped three-mode resonator 5 and the second fork-shaped three-mode resonator 6 are arranged in a centrosymmetric manner.
The front view is shown in fig. 2 and the relevant dimensions are shown in fig. 3. The dielectric substrate 7 used had a relative dielectric constant of 3.55, a thickness of 0.508mm and a loss tangent of 0.0027. With reference to fig. 3, the parameters of the power division filter are as follows: w1＝0.21mm，W2＝0.42mm，W3＝0.21mm，W4＝0.3mm，W5＝1.18mm，L1＝5 mm，L2＝1.41mm，L3＝2.987mm，L4＝12.44mm，L5＝9.95mm，L6＝7.81mm，L7＝3.473mm， L8＝9.7mm，L9＝1.67mm，L10＝1.9mm，g1＝0.22mm,g2＝0.18mm,R1＝2500Ω，R2＝5000 Ω。
The power division filter of the embodiment is modeled and simulated in electromagnetic simulation software HFSS.13.0. Fig. 4 is a simulation diagram of the S parameter of the power dividing filter in this example, and it can be seen from the diagram that the center frequencies of the three pass bands of the three-pass power dividing filter are 1.53GHz, 2.0GHz, and 2.36GHz, the corresponding 3dB relative bandwidths are 3.56%, 8.65%, and 2.75%, the return loss in the pass band is lower than 18.4dB, and the minimum insertion loss is 1.2 dB. The five transmission zeros outside the passband make the example power division filter very frequency selective and out-of-band harmonic rejection.
Fig. 5 is a simulation diagram of the S-parameters of the matching characteristic and the isolation characteristic of the two power output ports of the power division filter in this example, and it can be seen from the diagram that the return loss of the output port in the passband of the power division filter in this example is lower than 11.8dB, and the in-band isolation is better than 15.7 dB.
The invention processes and corrodes the metal surfaces of the front surface and the back surface of the circuit substrate in the manufacturing process of the printed circuit board, thereby forming the required metal pattern, having simple structure, being realized on a single PCB board, being convenient for processing and integrating and having low production cost. Meanwhile, good power distribution characteristics and filter characteristics are obtained by utilizing the multimode forked resonator and the network topology, and good port isolation characteristics are obtained by skillfully isolating the resistor between the resonators.
The three-passband power division filter has the advantages of high selectivity, compact structure, good port isolation, good out-of-band rejection characteristic, high selectivity, small insertion loss and good out-of-band rejection performance, and is suitable for modern wireless communication systems.
As shown in fig. 6, the coupling line structure in the present circuit structure can periodically generate the zero point, so that a good out-of-band rejection effect can be achieved in a wide frequency band outside the passband.
In the embodiment, the multimode forked resonator and the network topology are utilized to obtain good power distribution characteristics and filter characteristics, the resistor is ingeniously isolated between the resonators, and good port isolation characteristics are obtained, so that the three-passband power division filter which is high in selectivity, compact in structure, good in port isolation degree, good in out-of-band rejection characteristic, high in selectivity, small in insertion loss and good in out-of-band rejection performance is realized, and the three-passband power division filter is suitable for a modern wireless communication system.
The present invention provides a concept and a method of a three-pass band power splitting filter based on a multi-mode fork resonator, and a method and a way for implementing the technical scheme are many, and the above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and embellishments can be made without departing from the principle of the present invention, and these improvements and embellishments should also be regarded as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (3)
1. A three-passband power division filter based on a multimode forked resonator is characterized by comprising a dielectric substrate (9), wherein a metal grounding plate (8) is arranged on the bottom surface of the dielectric substrate (9), an input port feeder (1), a first output feeder (2) and a second output feeder (3) are arranged on the top surface of the dielectric substrate, the input port feeder (1) is located in the middle of the dielectric substrate (9), and the first output feeder (2) and the second output feeder (3) are symmetrically arranged on two sides of the input port feeder (1) respectively;
a first fork-shaped three-mode resonator (4) and a second fork-shaped three-mode resonator (6) are respectively arranged between the input port feeder line (1) and the first output feeder line (2);
a third fork-shaped three-mode resonator (5) and a fourth fork-shaped three-mode resonator (7) are respectively arranged between the input port feeder line (1) and the second output feeder line (3);
the input port feeder (1) comprises a first 50-ohm microstrip line conduction band (11) and an input coupling line (12), one end of the first 50-ohm microstrip line conduction band (11) is close to the first side edge (9a) of the dielectric substrate (9), and the other end of the first 50-ohm microstrip line conduction band is connected with the input coupling line (12); the connection part of the first 50 ohm microstrip line conduction band (11) and the first side edge (9a) of the dielectric substrate (9) is an input end;
the first fork-shaped three-mode resonator (4) and the third fork-shaped three-mode resonator (5) are symmetrical on two sides of the input coupling line (12);
the second fork-shaped three-mode resonator (6) and the fourth fork-shaped three-mode resonator (7) are symmetrical on two sides of the input coupling line (12);
the first fork-shaped three-mode resonator (4) and the fourth fork-shaped three-mode resonator (7) are arranged in a centrosymmetric manner;
the third fork-shaped three-mode resonator (5) and the second fork-shaped three-mode resonator (6) are arranged in a centrosymmetric manner;
the first fork-shaped three-mode resonator (4) comprises a first terminal short-circuit branch (41), a first terminal open-circuit branch (42), a second terminal open-circuit branch (43), a first fork-shaped terminal open-circuit branch (44) and a first grounding column (47);
one end of the first grounding column (47) is connected with the end part of the first terminal short circuit branch (41), and the other end of the first grounding column penetrates through the dielectric substrate (9) and is connected to the metal grounding plate (8);
the first terminal open-circuit branch (42) and the second terminal open-circuit branch (43) are respectively and symmetrically arranged at two sides of the first terminal short-circuit branch (41);
the first fork-shaped terminal open-circuit branch (44) and the first terminal short-circuit branch (41) are in the same straight line, and a first L-shaped terminal open-circuit branch (45) and a second L-shaped terminal open-circuit branch (46) are symmetrically arranged on two sides of the first fork-shaped terminal open-circuit branch (44) respectively;
the third fork-shaped three-mode resonator (5) comprises a second terminal short-circuit branch (51), a third terminal open-circuit branch (52), a fourth terminal open-circuit branch (53), a second fork-shaped terminal open-circuit branch (54) and a second grounding column (57);
one end of the second grounding column (57) is connected with the second terminal short circuit branch (51), and the other end of the second grounding column penetrates through the dielectric substrate (9) and is connected to the metal grounding plate (8);
the third terminal open-circuit branch (52) and the fourth terminal open-circuit branch (53) are respectively and symmetrically arranged at two sides of the second terminal short-circuit branch (51);
the second forked terminal open-circuit branch (54) and the second terminal short-circuit branch (51) are in the same straight line, and a third L-shaped terminal open-circuit branch (55) and a fourth L-shaped terminal open-circuit branch (56) are symmetrically arranged on two sides of the second forked terminal open-circuit branch (54) respectively;
the second forked three-mode resonator (6) comprises a third terminal short-circuit branch (61), a fifth terminal open-circuit branch (62), a sixth terminal open-circuit branch (63), a third forked terminal open-circuit branch (64) and a third grounding column (67);
one end of the third grounding column (67) is connected with the third terminal short circuit branch section (61), and the other end of the third grounding column penetrates through the dielectric substrate (9) and is connected to the metal grounding plate (8);
the fifth terminal open-circuit branch (62) and the sixth terminal open-circuit branch (63) are respectively and symmetrically arranged at two sides of the third terminal short-circuit branch (61);
the third Y-shaped terminal open-circuit branch (64) and the third terminal short-circuit branch (61) are in the same straight line, and a fifth L-shaped terminal open-circuit branch (65) and a sixth L-shaped terminal open-circuit branch (66) are symmetrically arranged on two sides of the third Y-shaped terminal open-circuit branch (64) respectively;
the fourth fork-shaped three-mode resonator (7) comprises a fourth terminal short-circuit branch (71), a seventh terminal open-circuit branch (72), an eighth terminal open-circuit branch (73), a fourth fork-shaped terminal open-circuit branch (74) and a fourth grounding column (77);
one end of a fourth grounding post (77) is connected with the fourth terminal short circuit branch (71), and the other end of the fourth grounding post penetrates through the dielectric substrate (9) and is connected to the metal grounding plate (8);
the seventh terminal open-circuit branch (72) and the eighth terminal open-circuit branch (73) are respectively and symmetrically arranged at two sides of the fourth terminal short-circuit branch (71);
the fourth fork-shaped terminal open-circuit branch (74) and the fourth terminal short-circuit branch (71) are in the same straight line, and a seventh L-shaped terminal open-circuit branch (75) and an eighth L-shaped terminal open-circuit branch (76) are symmetrically arranged on two sides of the fourth fork-shaped terminal open-circuit branch (74) respectively.
2. The three-passband power division filter based on the multimode fork resonator is characterized in that the first output feeder (2) consists of a second 50-ohm microstrip line conduction band (21) and an L-shaped output coupling line (22), the second 50-ohm microstrip line conduction band (21) is attached to the second side (9b) of the dielectric substrate (9), the L-shaped output coupling line (22) is connected with the second 50-ohm microstrip line conduction band (21), the L-shaped output coupling line (22) is parallel to the input coupling line (12), and the second 50-ohm microstrip line conduction band (21) is perpendicular to the input coupling line (12);
the joint of the second 50 ohm microstrip line conduction band (21) and the second side edge (9b) of the dielectric substrate (9) is a first output end.
3. The multi-mode fork resonator-based three-passband power splitting filter according to claim 1, wherein the second output feeder (3) is composed of a third 50-ohm microstrip line conduction band (31) and an L-shaped output coupling line (32), the third 50-ohm microstrip line conduction band (31) is attached to the third side (9c) of the dielectric substrate (9), the L-shaped output coupling line (32) is connected with the third 50-ohm microstrip line conduction band (31), the L-shaped output coupling line (32) is parallel to the input coupling line (12), and the third 50-ohm microstrip line conduction band (31) is perpendicular to the input coupling line (12);
the connection position of the third 50 ohm microstrip line conduction band (31) and the third side edge (9c) of the dielectric substrate (9) is a third output end.
Priority Applications (1)
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| CN111384534B (en) * | 2020-02-28 | 2021-08-27 | 南京智能高端装备产业研究院有限公司 | Three-way band-pass power division filter |
| CN111682292B (en) * | 2020-06-02 | 2022-05-20 | 南京师范大学 | Four-way power division filter based on four-mode resonator |
| CN113381142B (en) * | 2021-05-21 | 2022-03-11 | 南京智能高端装备产业研究院有限公司 | Three-passband power division filter with high frequency selectivity |
| CN115189108B (en) * | 2022-08-08 | 2023-10-20 | 河南科技大学 | Double-passband filter based on multimode resonator |
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| CN104900949A (en) * | 2015-06-05 | 2015-09-09 | 南京理工大学 | Broadband three-mode balanced band-pass filter based on interdigital multi-mode resonators |
| CN109066039A (en) * | 2018-06-25 | 2018-12-21 | 南京师范大学 | A kind of novel micro-strip function divides duplexer |
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| CN104900949A (en) * | 2015-06-05 | 2015-09-09 | 南京理工大学 | Broadband three-mode balanced band-pass filter based on interdigital multi-mode resonators |
| CN109066039A (en) * | 2018-06-25 | 2018-12-21 | 南京师范大学 | A kind of novel micro-strip function divides duplexer |
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