CN118017188A - Microstrip dual-frequency filtering power divider - Google Patents
Microstrip dual-frequency filtering power divider Download PDFInfo
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- CN118017188A CN118017188A CN202410343767.8A CN202410343767A CN118017188A CN 118017188 A CN118017188 A CN 118017188A CN 202410343767 A CN202410343767 A CN 202410343767A CN 118017188 A CN118017188 A CN 118017188A
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Abstract
The invention discloses a microstrip dual-frequency filtering power divider, and aims to provide a dual-frequency filtering power divider with low insertion loss and high isolation. The invention is realized by the following technical scheme: each part of the invention comprises an input port, a first output port, a second output port, two quarter-wavelength impedance transformation lines, two double-frequency resonance units and a 180 ° phase converter. The two quarter-wavelength impedance transformation lines serve as main power distribution paths and respectively connect the input port and the two output ports. Two dual-frequency resonant units with the same structure are respectively loaded at two output ports in parallel, and dual-frequency response with low insertion loss is provided. In addition, the 180 ° phase converter as an isolation network provides a high degree of isolation between the output ports. Simulation shows that the center frequency of the filter power divider disclosed by the invention is 1.375GHz and 1.625GHz, the in-band insertion loss is 3.3dB, and the in-band isolation is greater than 22.5dB, and the microstrip dual-frequency filter power divider disclosed by the invention has low insertion loss and high isolation.
Description
Technical Field
The invention relates to the technical field of microwave devices, in particular to a microstrip dual-frequency filtering power divider with low insertion loss and high isolation applied to an L-band.
Technical Field
With the continuous development of information society, communication technology is always at the front of continuous innovation. Communication technology has made tremendous progress in connecting people to people, devices to distances between devices, from the original analog communication to today's digital communication. Currently, various communication networks such as mobile communication, satellite communication, internet communication, etc. have been widely used, so that information transmission becomes more efficient and faster. Among many communication technologies, microwave communication technology has become one of the key technologies in the modern communication field due to its characteristics of high frequency, high transmission rate, and the like. However, as the complexity of microwave communication systems increases, so does the demand for signal processing techniques.
The filter power divider is used as an important signal processing tool and is widely applied to the aspects of signal processing, spectrum shaping, signal modulation and the like. Microwave communication systems need to be able to transmit multiple signals in different frequency bands while ensuring that no interference occurs between the signals to ensure communication quality and reliability. Therefore, the need for efficient and accurate signal processing has driven a continual increase in the performance of multi-frequency filtered power splitters. In the environment of high-speed data transmission and high competition of spectrum resources, the communication system has more urgent requirements on the multi-frequency filtering power divider.
The dual-frequency filtering power divider is widely applied and researched in a communication system. At present, the design mode is mainly to obtain a dual-frequency response by fusing a filter resonator and a power divider. However, in the design process, the dual-frequency filtering power divider is found to still have a short plate with high insertion loss and narrow isolation bandwidth.
Disclosure of Invention
Aiming at the problems of high insertion loss and narrow isolation bandwidth in the existing dual-frequency filtering power divider, the microstrip dual-frequency filtering power divider with low insertion loss and high isolation is obtained by applying the dual-frequency resonance unit and the 180 ° phase converter to the power divider structure.
The above object of the present invention can be achieved by the following means: a microstrip dual-band filtering power divider comprising: an input port, a first output port, a second output port, a quarter-wavelength impedance transformation line, a dual-frequency resonant unit, and a 180 ° phase transformer. The two quarter-wavelength impedance transformation lines serve as main power distribution paths and respectively connect the input port and the two output ports. Two identical dual-frequency resonant cells are loaded in parallel at the two output ports, respectively, providing a dual-frequency response with low insertion loss, while a 180 ° phase converter as an isolation network provides a high isolation between the output ports. In addition, the two double-frequency resonance units with the same structure are composed of a transmission line admittance converter and a transmission line resonator with the terminal grounded, and the 180 ° phase converter is composed of two sections of microstrip lines with the terminal grounded, two isolation resistors, a round short-circuit slot line, a slot line and a rectangular open-circuit slot line.
The invention has the beneficial effects that: the present invention provides a dual frequency response using a dual frequency resonant cell that achieves the desired frequency response without replacing the quarter wavelength impedance line. Also, the dual-frequency response thus obtained has a low insertion loss. In addition, the 180 ° phase converter adopted by the invention adopts a double-layer structure combining a microstrip line and a slot line, so that the isolation of output signals is improved, and the utilization rate of a circuit at the lower layer of the high-frequency dielectric substrate is improved. In addition, the invention realizes all double-frequency filtering power divider circuits by printing a planar microstrip circuit on a high-frequency medium substrate through a corrosion method, and has the advantage of small volume.
Drawings
FIG. 1 is a schematic diagram of a layered structure of a microstrip dual-frequency filtering power divider of the present invention;
FIG. 2 is a schematic diagram of upper layer circuit layout and dimension parameters of the microstrip dual-frequency filter power divider of the present invention;
FIG. 3 is a schematic diagram of the layout and dimension parameters of the lower layer of the microstrip dual-band filter power divider of the present invention;
fig. 4 is an S-parameter simulation graph of the microstrip dual-frequency filtering power divider of the present invention.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components, such as "left," "right," etc., as used to distinguish between various components, but are not limited to these terms, but are used solely for distinguishing between them.
It will be understood by those skilled in the art that the specific meaning of each of the various terms represented in the present invention is intended to be understood by the relevant art, and that the term "transmission line admittance transducer" is intended to be used in a broad sense to mean a segment of a quarter-wavelength microstrip transmission line capable of performing an admittance inversion function.
See fig. 1. In a preferred embodiment described below, a microstrip dual-frequency filtering power divider comprises: an input port 1, a first output port 2, a second output port 3, quarter-wavelength impedance transformation lines 4 and 5, transmission line admittance transformers 6 and 7 and 8, transmission line resonators 9 and 10 with terminal ground, transmission line admittance transformers 11 and 12 and 13 with terminal ground, transmission line resonators 14 and 15 with terminal ground, microstrip lines 16 and 17 with terminal ground, isolation resistors 18 and 19, a circular short-circuit slot line 20, a slot line 21, and a rectangular open-circuit slot line 22. In addition, 1-19 mentioned above are located on the upper circuit plane 23 and 20-22 are located on the lower circuit plane 24. The components can form a one-to-two power distribution path of the microstrip dual-frequency filtering power divider, a dual-frequency resonance unit loaded at the first output port 2, a dual-frequency resonance unit loaded at the second output port 3 and a 180 ° phase converter.
Preferably, for the microstrip dual-frequency filtering power divider, the basic one-to-two power distribution path is as follows: the input port 1 is located at the uppermost middle position of the upper circuit plane 23, and one end of the quarter-wavelength impedance transformation line 4 is directly connected to the input port 1, while the other end is directly connected to the first output port 2. One end of the quarter-wavelength impedance transformation line 5 is also directly connected to the input port 1, and the other end is directly connected to the second output port 3.
Preferably, for a microstrip dual-frequency filter power divider, the dual-frequency resonant unit is loaded at the first output port 2: one end of the transmission line admittance converter 6 is directly connected with the first output port 2, and the other end is connected with one end of the transmission line admittance converter 7 and one end of the transmission line admittance converter 8 in parallel. The other end of the admittance converter 7 is connected in series with a transmission line resonator 9 with a terminal grounded, and the other end of the admittance converter 8 is connected in series with a transmission line resonator 10 with a terminal grounded. By controlling the electrical length of the transmission line resonators 9 and 10, the position of the two frequencies of the dual-frequency response can be effectively controlled. By controlling the impedance of the transmission line admittance converters 7 and 8, the bandwidths of the two pass bands can be effectively controlled. By controlling the impedance of the transmission line admittance converter 6, the stopband bandwidth between the two pass bands can be effectively controlled.
Preferably, for a microstrip dual-frequency filter power divider, the dual-frequency resonant unit is loaded at the second output port 3: one end of the transmission line admittance converter 11 is directly connected to the second output port 3, and the other end is connected in parallel with one end of the transmission line admittance converter 12 and one end of the transmission line admittance converter 13. While the other end of the admittance converter 12 is connected in series with a transmission line resonator 14 with a terminal grounded, and the other end of the admittance converter 13 is connected in series with a transmission line resonator 15 with a terminal grounded. By controlling the electrical length of the transmission line resonators 14 and 15, the location of the two frequencies of the dual-frequency response can be effectively controlled. By controlling the impedance levels of the transmission line admittance converters 12 and 13, the bandwidths of the two pass bands can be effectively controlled. By controlling the impedance of the transmission line admittance converter 11, the stopband bandwidth between the two pass bands can be effectively controlled.
Preferably, for the upper circuit portion of the 180 ° phase converter: microstrip lines 16 and 17 with grounded terminals are led out from the first and second output ports 2 and 3, respectively, and the microstrip lines 16 and 17 are connected to each other again at the terminal ground holes through respective isolation resistors 18 and 19 connected in parallel.
Preferably, for the lower circuit portion of the 180 ° phase converter: the slot line 21 is located at the center of the lower circuit plane 24 and is spatially located directly below the microstrip lines 16 and 17. In the lower circuit plane 24, a circular short-circuit slot line 20 is connected to the upper end of the slot line 21, and a rectangular open-circuit slot line 22 is connected to the lower end.
Preferably, for a 180 ° phase converter, it is composed of an upper circuit part and a lower circuit part, which need to work normally by the cooperation of the two parts. The isolation network is connected between the output ports as an isolation network, so that the output isolation degree can be effectively improved.
See fig. 2 and 3. Corresponding to the components 1-24 in fig. 1, fig. 2 and 3 are schematic diagrams of upper and lower circuit layouts and dimension parameters of the dual-band filtering power divider according to the preferred embodiment of the present invention. All the grounding through holes are marked by using a dotted line frame, penetrate through the upper layer circuit and the lower layer circuit, correspond to each other in position one by one, and have the diameter equal to 1mm. The remaining noted parameters are as follows:
W0＝1.12mm,W1＝0.61mm,L1＝30.29mm,W2＝0.61mm,L2＝33.91mm,R1＝R2＝100Ω,d＝7.62mm,g＝0.2mm,Lg＝9.64mm,Ws＝8mm,LS＝33.95mm,W3＝3.03mm,W4＝0.6mm,W5＝0.6mm,W6＝1mm,W7＝1mm,L3＝28.9mm,L4＝34.66mm,L5＝31.36mm,L6＝35.5mm,L7＝28.4mm.
See fig. 4. For the S-parameter simulation graph of the dual-frequency filtering power divider provided by the preferred embodiment of the present invention, the 1 port in the S-parameter of the graph corresponds to the input port in the present invention, and the 2 and 3 ports respectively correspond to the two output ports in the present invention. Analysis of fig. 4 may yield: the center frequencies of the two pass bands are 1.375GHz and 1.625GHz respectively, the in-band return loss is more than 20dB, and the 10dB bandwidths of the two pass bands are about 110 MHz. The in-band insertion loss is about 3.3dB, and the dual-frequency filtering power divider provided by the embodiment has the characteristic of low insertion loss. The in-band isolation is greater than 22.5dB, which indicates that the dual-frequency filtering power divider provided by the embodiment has good isolation.
It will be apparent to those skilled in the art that some modifications may be made to the structure and associated methods as possible while improving the performance of the dual-band filtered power divider, while maintaining the teachings of the present invention. Accordingly, the above disclosure should be viewed as limited only by the scope of the appended claims. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention, which do not depart from the technical solution of the present invention, belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. A microstrip dual-band filtering power divider comprising: an input port (1), a first output port (2), a second output port (3), quarter-wavelength impedance transformation lines (4) (5), a dual-frequency resonant unit and a 180 DEG phase converter. The input port (1) is connected with the two output ports (2) and (3) by using quarter-wavelength impedance transformation lines (4) and (5), and the two output ports (2) and (3) are connected through a 180-degree phase converter. In addition, two double-frequency resonance units with the same structure are respectively loaded at the first output port (2) and the second output port (3). The dual-frequency resonance unit loaded on the first output port (2) consists of transmission line admittance converters (6) (7) (8) and transmission line resonators (9) (10) with the terminals grounded, and the dual-frequency resonance unit loaded on the second output port (3) consists of transmission line admittance converters (11) (12) (13) and transmission line resonators (14) (15) with the terminals grounded. The 180 DEG phase converter is composed of two sections of microstrip lines (16) and (17) with terminals grounded, two isolation resistors (18) and (19), a circular short-circuit slot line (20), a slot line (21) and a rectangular open-circuit slot line (22). In addition, the above-mentioned (1) to (19) are included in the upper layer circuit plane (23), and the above-mentioned (20) to (22) are included in the lower layer circuit plane (24).
2. The microstrip dual-band filtering power divider of claim 1, wherein: the input port (1) is positioned at the middle position of the uppermost part of the upper circuit plane (23), one end of the quarter-wavelength impedance transformation line (4) is directly connected with the input port (1), and the other end is directly connected with the first output port (2). One end of the quarter-wavelength impedance transformation line (5) is directly connected with the input port (1) as well, and the other end is directly connected with the second output port (3). This builds the most basic one-to-two power distribution path.
3. The microstrip dual-band filtering power divider of claim 1, wherein: one end of the transmission line admittance converter (6) is directly connected with the first output port (2), and the other end is connected with one end of the transmission line admittance converter (7) and one end of the transmission line admittance converter (8) in parallel. The other end of the admittance converter (7) is connected in series with a transmission line resonator (9) with the terminal grounded, and the other end of the admittance converter (8) is connected in series with a transmission line resonator (10) with the terminal grounded. The dual-frequency resonant unit loaded at the first output port (2) is thus constructed.
4. The microstrip dual-band filtering power divider of claim 1, wherein: one end of the transmission line admittance converter (11) is directly connected with the second output port (3), and the other end is connected with one end of the transmission line admittance converter (12) and one end of the transmission line admittance converter (13) in parallel. The other end of the admittance converter (12) is connected in series with a transmission line resonator (14) with the terminal grounded, and the other end of the admittance converter (13) is connected in series with a transmission line resonator (15) with the terminal grounded. The dual-frequency resonant unit loaded at the second output port (3) is thus constructed.
5. The microstrip dual-band filtering power divider of claim 1, wherein: microstrip lines (16, 17) with grounded terminals are led out from the first and second output ports (2, 3), respectively, and the microstrip lines (16, 17) are connected with each other again at the ground holes of the terminals through isolation resistors (18, 19) respectively connected in parallel. This constitutes the upper circuit part of the 180 deg. phase converter.
6. The microstrip dual-band filtering power divider of claim 1, wherein: the slot line (21) is located at the center of the lower circuit plane (24) and is spatially located directly below the microstrip lines (16) (17). In addition, in the lower circuit plane (24), the upper end of the slit slot line (21) is connected with a round short-circuit slot line (20), and the lower end is connected with a rectangular open-circuit slot line (22). The three slot lines (20) (21) (22) form the lower circuit portion of the 180 DEG phase converter.
7. The microstrip dual-band filtering power divider as claimed in claims 5 and 6, wherein: the 180 DEG phase converter is connected between the first output port (2) and the second output port (3) as an isolation network by the cooperation of the upper circuit part and the lower circuit part, so as to provide high isolation for the dual-frequency filtering power divider.
8. The microstrip dual-band filtering power divider of claim 1, wherein: the characteristic impedance of the input port (1), the first output port (2) and the second output port (3) is 50Ω.
9. The microstrip dual-band filtering power divider of claim 1, wherein: the upper circuit planes (23) including (1) - (19) are printed on the upper surface of the high-frequency dielectric substrate of epsilon r =3.5 by etching, and the lower circuit planes (24) including (20) - (22) are printed on the lower surface of the high-frequency dielectric substrate of epsilon r =3.5 by etching.
10. The microstrip dual-band filtering power divider of claim 1, wherein: the lower circuit plane (24) corresponds to the lower circuit plane (24), and the rest of the lower circuit plane (24) is covered with copper except for the slot lines (20) (21) (22) and the grounding through hole part. In addition, all terminal grounding structures are grounded through metal through holes and an underlying circuit plane (24).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410343767.8A CN118017188A (en) | 2024-03-25 | 2024-03-25 | Microstrip dual-frequency filtering power divider |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410343767.8A CN118017188A (en) | 2024-03-25 | 2024-03-25 | Microstrip dual-frequency filtering power divider |
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| CN118017188A true CN118017188A (en) | 2024-05-10 |
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| CN202410343767.8A Pending CN118017188A (en) | 2024-03-25 | 2024-03-25 | Microstrip dual-frequency filtering power divider |
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