CN114284677A - High-selectivity broadband inverse filtering power divider based on three-wire coupling - Google Patents
High-selectivity broadband inverse filtering power divider based on three-wire coupling Download PDFInfo
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Abstract
The invention relates to a high-selectivity broadband inverse filter power divider based on three-wire coupling, which comprises a dielectric substrate and a circuit layer, wherein a metal grounding plate is arranged on the lower surface of the dielectric substrate, the circuit layer is arranged on the upper surface of the dielectric substrate, and the circuit layer comprises an input port feeder line, a branch loading resonator, a first output port feeder line, a second output port feeder line, an output port connecting line and a grounding resistor; when the device works, a signal enters from an input port feeder line, is coupled to the stub loading resonator in parallel through two paths of quarter-wavelength open-circuit coupling lines to generate resonance, is coupled and output through a first output port feeder line and a second output port feeder line after resonance, phase-opposite difference is generated by terminal grounding of the first output port feeder line and a phase-shift feeder line of the second output port feeder line, and output port signal isolation is realized by loading a grounding resistor through an output port connecting line. The invention has the advantages of simple structure, flexible design, high selectivity, large bandwidth and good port matching and isolation.
Description
Technical Field
The invention belongs to the technical field of microwave passive devices, and particularly relates to a high-selectivity broadband inverse filtering power divider based on three-wire coupling.
Background
In recent years, modern wireless communication systems have been developed vigorously, and demands for miniaturized, low-cost, and multifunctional microwave devices have increased. Among them, the inverted phase filtering power divider is receiving more and more attention as a multifunctional device integrating signal filtering, power distribution, signal inverting and port isolation functions. The high-performance inverse filtering power divider not only can effectively reduce the size of a system, but also can simplify the complexity of system design and reduce the design cost, so that the high-performance inverse filtering power divider can be widely applied to the design of systems such as a feed system, a power amplifier, a mixer and the like of an array antenna.
Document 1(h.zhu, z.cheng and y.j.guo, "Design of Wideband In-Phase and Out-of-Phase Power Dividers Using Microstrip-to-Slotline Transitions and Slotline detectors," IEEE Transitions on Microwave Theory and Techniques, vol.67, No.4, pp.1412-1424, April 2019) designs an ultra-Wideband inverting Power divider Using a transition structure of Microstrip-slot lines, which uses resonance of slot lines to achieve ultra-wide operating bandwidth without frequency selective characteristics, and requires additional cascaded filters for some specific system applications, which is not favorable for miniaturization of system Design size and performance improvement.
Document 2(w.yu and j., "multi In-Phase/anti-Phase Power Dividing Network With bandwidth Based on direct reactor," IEEE Transactions on Microwave and technology, vol.66, No.11, pp.4773-4782, nov.2018) designs an anti-Phase Power divider With multiple output ports using Dielectric resonators, which In combination With a cavity can achieve higher frequency selectivity but it is difficult to avoid the problems of larger size and narrower bandwidth.
Document 3(x.y.zhang, x. — f.liu, y.c.li, w. — l.zhan, q.y.lu and j. — x.chen, "LTCC Out-of-Phase Filtering Power Divider base Multiple broad Coupled Lines," IEEE Transactions on Components, Packaging and Manufacturing Technology, vol.7, No.5, pp.777-785, May 2017) utilizes a multi-layer implementation of a Coupled line structure, and Based on a low-temperature co-fired ceramic Technology, a dual-mode reverse-Phase Filtering Power Divider with a very compact size is designed, but due to the high complexity of the process, the performance achieved by the Power Divider still needs to be further improved in terms of Filtering characteristics, reflection characteristics, port isolation, and the like.
In summary, the prior art has the following problems: the inverse filtering power divider cannot give consideration to simple structure, flexible design, high selectivity, wide bandwidth, good port matching and isolation, and is not beneficial to popularization and application in modern wireless communication systems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a high-selectivity broadband inverse filtering power divider based on three-wire coupling, which adopts the following technical scheme:
a high-selectivity broadband inverse filter power divider based on three-wire coupling comprises a dielectric substrate and a circuit layer, wherein a metal grounding plate is arranged on the lower surface of the dielectric substrate, the circuit layer is arranged on the upper surface of the dielectric substrate, and the circuit layer comprises an input port feeder line, a branch loading resonator, a first output port feeder line, a second output port feeder line, an output port connecting line and a grounding resistor;
the input port feeder line comprises a first microstrip line conduction band, a first quarter-wavelength open-circuit coupling line and a second quarter-wavelength open-circuit coupling line, the first quarter-wavelength open-circuit coupling line and the second quarter-wavelength open-circuit coupling line are parallel to each other and have a certain distance, the input ends of the first quarter-wavelength open-circuit coupling line and the second quarter-wavelength open-circuit coupling line are simultaneously and electrically connected with the output end of the first microstrip line conduction band, both the first quarter-wavelength open-circuit coupling line and the second quarter-wavelength open-circuit coupling line comprise an open end, and the input end of the first microstrip line conduction band is positioned at the edge of the dielectric substrate;
the first output port feeder line comprises a second microstrip line conduction band and a quarter-wavelength short-circuit coupling line, the terminal of the quarter-wavelength short-circuit coupling line is connected with the metal ground plate through a metalized via hole, the other end of the quarter-wavelength short-circuit coupling line is electrically connected with the input end of the second microstrip line conduction band, and the output end of the second microstrip line conduction band is positioned at the edge of the dielectric substrate;
the second output port feeder line comprises a third microstrip line conduction band, a quarter-wavelength transmission line and a third quarter-wavelength open-circuit coupling line, two ends of the quarter-wavelength transmission line are respectively and electrically connected with an input end of the third microstrip line conduction band and an output end of the third quarter-wavelength open-circuit coupling line, the output end of the third microstrip line conduction band is positioned at the edge of the dielectric substrate, the other end of the third quarter-wavelength open-circuit coupling line is an open-circuit end, and the third quarter-wavelength open-circuit coupling line and the quarter-wavelength short-circuit coupling line are parallel to each other and have a certain distance;
the stub loading resonator comprises a first quarter-wavelength open resonator, a second quarter-wavelength open resonator, a first quarter-wavelength loading stub and a second quarter-wavelength loading stub, the first quarter-wavelength open resonator is electrically connected with the second quarter-wavelength open resonator, the first quarter-wavelength open resonator is parallel to the first quarter-wavelength open coupling line and is positioned between the first quarter-wavelength open coupling line and the second quarter-wavelength open coupling line, the second quarter-wavelength open resonator is parallel to the quarter-wavelength short coupling line and is positioned between the quarter-wavelength short coupling line and the third quarter-wavelength open coupling line, one end of the first quarter-wavelength loading stub and one end of the second quarter-wavelength loading stub are respectively and electrically connected with the connection position of the first quarter-wavelength open resonator and the second quarter-wavelength open resonator, the other end is an open-circuit free end;
one end of the output port connecting line is electrically connected with the junction of the conduction band of the second microstrip line and the quarter-wavelength short-circuit coupling line, and the other end of the output port connecting line is electrically connected with the junction of the conduction band of the third microstrip line and the quarter-wavelength transmission line; one end of the grounding resistor is electrically connected with the metal grounding plate through the metalized through hole, and the other end of the grounding resistor is electrically connected with the midpoint position of the output port connecting line;
when the device works, a signal enters from the input port feeder line, is coupled to the branch loading resonator in parallel through the two paths of quarter-wavelength open-circuit coupling lines to generate resonance, and is output through the first output port feeder line and the second output port feeder line after resonance, the length of the quarter-wavelength transmission line is used for adjusting the phase difference of the output signal, and the width of the output port connecting line and the resistance value of the grounding resistor are used for adjusting the isolation between the output ports and the impedance matching of the two output ports.
Further, the widths and the parallel spacing of the first quarter-wavelength open resonator, the first quarter-wavelength open coupling line and the second quarter-wavelength open coupling line determine the coupling strength of the input signal; the widths and the parallel spacing of the second quarter-wave open resonator, the quarter-wave short-circuit coupling line and the third quarter-wave open-circuit coupling line determine the coupling strength of the output signal.
Furthermore, the first quarter-wavelength open resonator and the second quarter-wavelength open resonator have the same size so as to determine the position of a transmission pole at the central frequency of the filter power divider; the first quarter-wavelength loading branch and the second quarter-wavelength loading branch are different in size so as to determine the positions of two transmission zeros at two sides of the passband and the positions of the other two transmission poles in the passband.
Further, the first microstrip line conduction band, the second microstrip line conduction band and the third microstrip line conduction band are all 50 Ω microstrip line conduction bands.
Further, the length of the output port connection line is one-half wavelength at the center frequency.
The invention has the beneficial effects that: compared with the prior art, the invention has the advantages of simple structure, flexible design, high selectivity, large bandwidth and good port matching and isolation, and the specific expression is as follows:
(1) the structure is simple: the invention can be realized on a single-layer PCB board, is convenient to process and integrate and has low production cost.
(2) The design is flexible: the invention skillfully utilizes a single multimode resonator to design the inverse filtering power divider, and has wide application range.
(3) The selectivity is high: the invention adopts the branch-node loaded resonator to design the three-mode broadband filter response, has two transmission zeros, steep passband edge and high frequency selectivity.
(4) Port matching characteristics in a wide band range are good: the in-band return loss of the high-selectivity broadband inverse filter power divider based on three-wire coupling is less than-19.7 dB, and the 3-dB relative bandwidth is 37%.
(5) The isolation is high: the high-selectivity broadband inverse filter power divider based on three-wire coupling adopts a mode of loading the grounding resistor at the midpoint of the connecting wire of the output ports, and realizes that the isolation between the two inverse output ports is higher than 23dB in a pass band.
Drawings
Fig. 1 is a schematic perspective view of an inverse filter power divider according to the present invention;
FIG. 2 is a top view of the inverse filter power divider of the present invention;
fig. 3 is a schematic structural dimension diagram of an inverse filter power divider according to an embodiment of the present invention;
fig. 4 is a simulation diagram of the S parameter of the inverse filter power divider according to the embodiment of the present invention;
FIG. 5 is a simulation graph of phase difference and amplitude difference at an output port of the inverse filter power divider according to an embodiment of the present invention;
wherein, 1-input port feeder, 11-first microstrip line conduction band, 12-first quarter-wavelength open-circuit coupled line, 13-second quarter-wavelength open-circuit coupled line, 2-stub loaded resonator, 21-first quarter-wavelength open-circuit resonator, 22-second quarter-wavelength open-circuit resonator, 23-first quarter-wavelength loaded stub, 24-second quarter-wavelength loaded stub, 3-first output port feeder, 31-second microstrip line conduction band, 32-quarter-wavelength short-circuit coupled line, 4-second output port feeder, 41-third microstrip line, 42-quarter-wavelength transmission line, 43-third quarter-wavelength open-circuit coupled line, 5-output port connecting line, 6-ground resistance, 7-rectangular dielectric substrate, 8-metal grounding plate.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the high-selectivity broadband inverse filter power divider based on three-wire coupling according to the present invention includes a rectangular dielectric substrate 7 having a metal ground plate 8 on a lower surface thereof, wherein an input port feeder 1, a stub loaded resonator 2, a first output port feeder 3, a second output port feeder 4, an output port connecting wire 5, and a ground resistor 6 are disposed on an upper surface of the rectangular dielectric substrate 7.
The input port feeder 1 comprises a first microstrip line conduction band 11, a first quarter-wavelength open-circuit coupling line 12 and a second quarter-wavelength open-circuit coupling line 13, the first quarter-wavelength open-circuit coupling line 12 and the second quarter-wavelength open-circuit coupling line 13 are parallel to each other and have a certain distance, the input ends of the first quarter-wavelength open-circuit coupling line and the second quarter-wavelength open-circuit coupling line are electrically connected with the output end of the first microstrip line conduction band 11, the input end of the first microstrip line conduction band 11 is located at the edge of the short side of the rectangular dielectric substrate 7, the first quarter-wavelength open-circuit coupling line 12 and the second quarter-wavelength open-circuit coupling line 13 are bent twice to reduce the size, and the open end points to the other short side of the rectangular dielectric substrate 7.
The first output port feeder line 3 comprises a second microstrip line conduction band 31 and a quarter-wave short-circuit coupling line 32, the terminal of the quarter-wave short-circuit coupling line 32 is connected with the metal floor 8 through a metalized via hole, the other end of the quarter-wave short-circuit coupling line 32 is electrically connected with the input end of the second microstrip line conduction band 31 and presents a vertical structure, the output end of the second microstrip line 31 is located at the edge of the long edge of the rectangular dielectric substrate 7, the first output port feeder line 3 presents three times of right-angle bending, and the terminal points to the other short edge of the dielectric substrate 7.
The second output port feeder 4 includes a third microstrip line conduction band 41, a quarter-wavelength transmission line 42 and a third quarter-wavelength open-circuit coupling line 43, after the quarter-wavelength transmission line 42 is bent at a right angle for one time, one arm is perpendicular to the third microstrip line conduction band 41 and is electrically connected at a terminal, the other arm is linearly connected with an output end of the third quarter-wavelength open-circuit coupling line 43, the output end of the third microstrip line conduction band 41 is located on the other short side edge of the rectangular dielectric substrate 7 opposite to the side where the input port feeder 1 is located, a line formed by the third quarter-wavelength open-circuit coupling line 43 and a line formed by the quarter-wavelength short-circuit coupling line 32 are parallel to each other and have a certain distance and include an open end, and the open end of the third quarter-wavelength open-circuit coupling line 43 points to the second quarter-wavelength open-circuit coupling line 13.
The stub-loaded resonator 2 includes a first quarter-wavelength open resonator 21, a second quarter-wavelength open resonator 22, a first quarter-wavelength loaded stub 23, and a second quarter-wavelength loaded stub 24, the first quarter-wavelength open resonator 21 is electrically connected to the second quarter-wavelength open resonator 22, the first quarter-wavelength open resonator 21 is parallel to the first and second quarter-wavelength open coupling lines 12 and 13 and is located between the first and second quarter-wavelength open coupling lines 12 and 13, the second quarter-wavelength open resonator 22 is parallel to the quarter-wavelength short coupling line 32 and the third quarter-wavelength open coupling line 43 and is located between the quarter-wavelength short coupling line 32 and the third quarter-wavelength open coupling line 43, and one end of the first quarter-wavelength loaded stub 23 and one end of the second quarter-wavelength loaded stub 24 are respectively connected to the first quarter-wavelength open resonator 21 and the second quarter-wavelength open resonator 43 The connection part of the open-circuit quarter-wave resonator 22 is electrically connected, the other end of the open-circuit quarter-wave resonator is an open-circuit free end, the second quarter-wave loading branch 24 is bent for multiple times to keep a certain length, and the loading connection ends of the first quarter-wave loading branch 23 and the second quarter-wave loading branch 24 are kept a small distance to be positioned on the same side so as to reduce the circuit size.
The two ends of the output port connecting line 5 are respectively and electrically connected with the connection position of the second microstrip line conduction band 31 and the quarter-wave short-circuit coupling line 32 and the connection position of the third microstrip line conduction band 41 and the quarter-wave transmission line 42, and the length of the output port connecting line is ensured to be a certain length through bending, and the length of the output port connecting line is about one half wavelength of the central frequency. One end of the grounding resistor 6 is electrically connected with the metal floor 8 through the metalized via hole, and the other end of the grounding resistor is electrically connected with the length midpoint of the output port connecting wire 5.
In the high-selectivity broadband inverse filter power divider based on three-wire coupling, the odd-even mode resonance frequency of the stub loaded resonator 2 determines the positions of three resonance poles in a pass band, wherein the first quarter-wavelength open-circuit resonator 21 and the second quarter-wavelength open-circuit resonator 22 have the same size (length and width) and determine the position of a transmission pole at the center frequency of the pass band, the first quarter-wavelength loaded stub 23 and the second quarter-wavelength loaded stub 24 determine the positions of two transmission zeros at two sides of the pass band and the other two transmission poles in the pass band, the positions of the transmission zeros are respectively at the frequencies of the quarter-wavelength open-circuit resonance of the corresponding stubs, the widths and the parallel intervals of the first quarter-wavelength open-circuit resonator 22, the first quarter-wavelength open-circuit coupling line 12 and the second quarter-wavelength open-circuit coupling line 13 determine the coupling strength of an input signal, the widths and the parallel intervals of the second quarter-wavelength open-circuit resonator 22, the quarter-wavelength short-circuit coupling line 32 and the third quarter-wavelength open-circuit coupling line 43 determine the coupling strength of the output signals, the two coupling strengths are used for adjusting the bandwidth and the impedance matching of the filter power divider, the coupling strength of the output signals also determines the amplitudes of the two output signals, the length of the quarter-wavelength transmission line 42 can be used for adjusting the phase difference of the two output signals, and in addition, the width of the output port connecting line 5 and the resistance value of the grounding resistor can be used for adjusting the isolation between the output ports and the impedance matching of the two output ports.
The work mechanism of the inverse filtering power divider is as follows: signals enter from an input port feeder line 1, are coupled to the branch knot loading resonator 2 in parallel through two paths of quarter-wavelength open-circuit coupling lines to generate resonance, are coupled and output through a first output port feeder line 3 and a second output port feeder line 4 after resonance, phase difference in opposite phases is generated by terminal grounding of the first output port feeder line 3 and a quarter-wavelength transmission line 42 of the second output port feeder line 4, and output port signal isolation is realized by loading a grounding resistor 6 through an output port connecting line 5.
The invention processes and corrodes the metal surface of the front surface of the circuit substrate by the manufacturing process of the printed circuit board in the manufacturing process, thereby forming the required metal pattern, realizes the metallized through hole by the copper deposition process, has compact structure, can be realized on a single PCB and has low production cost. Meanwhile, a single multimode resonator and two pairs of three-wire coupling structures in different forms are used as feeders, so that frequency response with high broadband selection characteristics, good phase reversal characteristics, high-level port isolation and compact design size are realized. The high-selectivity broadband inverse filtering power divider based on three-wire coupling has the advantages of simple structure, flexible design, high selectivity, wide bandwidth and good port matching and isolation, and is suitable for modern wireless communication systems.
The dielectric substrate 7 used in this example 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 inverse filter power divider has the following dimensional parameters: wp＝1.18mm，Wf1＝04mm，Wf2＝0.5mm，W1＝0.3mm，W2＝0.2mm，W3＝0.2mm，W5＝0.9mm，W6＝0.6mm，Lp＝5mm，L11＝3.4mm，L12＝15mm，L13＝2.2mm，L14＝0.3mm，Ld＝0.3mm，L2＝15.8mm，L3＝25.8mm，L4＝20mm，L5＝18.8mm，L6＝21mm，L7＝21.2mm，g1＝0.1mm，g20.1mm, the resistance of the ground resistor is 50 Ω. The total area of the conduction band of the 50 omega microstrip line of the inverse filter power divider is 23.6 multiplied by 30.2mm2The corresponding guided wavelength dimension is about 0.32 λg×0.41λgWherein λ isgThe guided wave wavelength is corresponding to the center frequency of the passband.
The inverse filter power divider of the embodiment is modeled and simulated in electromagnetic simulation software ANSYS EM Suite 18.0. Fig. 4 is a simulation diagram of S-parameter of the inverse filter power divider of the present embodiment, and it can be seen from the diagram that the passband center frequency of the inverse filter power divider is 2.42GHz, the in-band return loss is less than-19.7 dB, the 3-dB relative bandwidth is 37%, the minimum insertion loss is 0.57(+3) and 0.27(+3) dB respectively, the isolation between the two output ports is higher than 23.5dB, and the impedance matching of the output ports is better than 15.4dB and 18.4dB respectively. In addition, three resonance poles are arranged in the pass band, and two transmission zeros are arranged outside the pass band, so that the anti-phase filtering power divider has good frequency selectivity.
Fig. 5 shows the phase difference and amplitude difference between the two output ports of the inverse filter power divider of the present embodiment, and it can be seen from the graph that the phase difference of the output ports of the inverse filter power divider of the present embodiment in the operating frequency range is within 180 ± 12 °, and the amplitude difference is within ± 0.4 dB.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (5)
1. A high-selectivity broadband anti-phase filtering power divider based on three-wire coupling is characterized by comprising a dielectric substrate (7) and a circuit layer, wherein a metal grounding plate (8) is arranged on the lower surface of the dielectric substrate (7), the circuit layer is arranged on the upper surface of the dielectric substrate (7), and the circuit layer comprises an input port feeder line (1), a branch loading resonator (2), a first output port feeder line (3), a second output port feeder line (4), an output port connecting line (5) and a grounding resistor (6);
the input port feeder (1) comprises a first microstrip line conduction band (11), a first quarter-wavelength open-circuit coupling line (12) and a second quarter-wavelength open-circuit coupling line (13), the first quarter-wavelength open-circuit coupling line (12) and the second quarter-wavelength open-circuit coupling line (13) are parallel to each other and have a certain distance, the input ends of the first quarter-wavelength open-circuit coupling line and the second quarter-wavelength open-circuit coupling line are simultaneously and electrically connected with the output end of the first microstrip line conduction band (11) and both comprise an open-circuit end, and the input end of the first microstrip line conduction band (11) is positioned at the edge of the dielectric substrate (7);
the first output port feeder line (3) comprises a second microstrip line conduction band (31) and a quarter-wavelength short-circuit coupling line (32), the terminal of the quarter-wavelength short-circuit coupling line (32) is connected with the metal ground plate (8) through a metalized via hole, the other end of the quarter-wavelength short-circuit coupling line (32) is electrically connected with the input end of the second microstrip line conduction band (31), and the output end of the second microstrip line conduction band (31) is positioned at the edge of the dielectric substrate (7);
the second output port feeder line (4) comprises a third microstrip line conduction band (41), a quarter-wavelength transmission line (42) and a third quarter-wavelength open-circuit coupling line (43), two ends of the quarter-wavelength transmission line (42) are respectively electrically connected with an input end of the third microstrip line conduction band (41) and an output end of the third quarter-wavelength open-circuit coupling line (43), the output end of the third microstrip line conduction band (41) is located at the edge of the dielectric substrate (7), the other end of the third quarter-wavelength open-circuit coupling line (43) is an open-circuit end, and the third quarter-wavelength open-circuit coupling line (43) and the quarter-wavelength short-circuit coupling line (32) are parallel to each other and have a certain distance;
the stub loaded resonator (2) comprises a first quarter-wavelength open resonator (21), a second quarter-wavelength open resonator (22), a first quarter-wavelength loaded stub (23) and a second quarter-wavelength loaded stub (24), the first quarter-wavelength open resonator (21) is electrically connected with the second quarter-wavelength open resonator (22), the first quarter-wavelength open resonator (21) is parallel to the first quarter-wavelength open coupling line (12) and is positioned between the first quarter-wavelength open coupling line (12) and the second quarter-wavelength open coupling line (13), the second quarter-wavelength open resonator (22) is parallel to the quarter-wavelength short coupling line (32) and is positioned between the quarter-wavelength short coupling line (32) and the third quarter-wavelength open coupling line (43), one end of the first quarter-wavelength loading branch (23) and one end of the second quarter-wavelength loading branch (24) are respectively and electrically connected with the connection part of the first quarter-wavelength open-circuit resonator (21) and the second quarter-wavelength open-circuit resonator (22), and the other ends are open-circuit free ends;
one end of the output port connecting line (5) is electrically connected with the connection position of the second microstrip line conduction band (31) and the quarter-wavelength short-circuit coupling line (32), and the other end of the output port connecting line is electrically connected with the connection position of the third microstrip line conduction band (41) and the quarter-wavelength transmission line (42); one end of the grounding resistor (6) is electrically connected with the metal grounding plate (8) through the metalized through hole, and the other end of the grounding resistor is electrically connected with the middle point of the output port connecting wire (5);
when the device works, a signal enters from an input port feeder line (1), is coupled to the branch loading resonator (2) in parallel through two paths of quarter-wavelength open-circuit coupling lines to generate resonance, and is output through a first output port feeder line (3) and a second output port feeder line (4) after resonance, the length of the quarter-wavelength transmission line (42) is used for adjusting the phase difference of the output signal, and the width of an output port connecting line (5) and the resistance value of a grounding resistor (6) are jointly used for adjusting the isolation between output ports and the impedance matching of the two output ports.
2. The three-wire coupling-based highly selective broadband inverse filter power divider as claimed in claim 1, wherein the widths and the parallel pitches of the first quarter-wavelength open resonator (21), the first quarter-wavelength open coupling line (12) and the second quarter-wavelength open coupling line (13) determine the coupling strength of the input signal; the widths and the parallel spacing of the second quarter-wave open resonator (22), the quarter-wave short-circuit coupling line (32) and the third quarter-wave open-circuit coupling line (43) determine the coupling strength of the output signal.
3. The three-wire coupling-based highly selective broadband inverse filter power divider according to claim 1, wherein the first quarter-wave open resonator (21) and the second quarter-wave open resonator (22) have the same size to determine a position of a transmission pole at a center frequency of the filter power divider; the first quarter-wave loading branch (23) and the second quarter-wave loading branch (24) are different in size so as to determine the positions of two transmission zeros at two sides of the passband and the other two transmission poles in the passband.
4. The three-wire coupling-based high-selectivity broadband inverse filter power divider as recited in claim 1, wherein the first microstrip line conduction band (11), the second microstrip line conduction band (31) and the third microstrip line conduction band (41) are all 50 Ω microstrip line conduction bands.
5. The three-wire coupling-based highly selective broadband inverse filter power divider according to claim 1, wherein the length of the output port connection line (5) is one-half wavelength at the center frequency.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115473019A (en) * | 2022-08-09 | 2022-12-13 | 华南理工大学 | Filtering power divider with reconfigurable channel number and radio frequency front end |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934663A (en) * | 2015-06-23 | 2015-09-23 | 南京理工大学 | Broadband high-selectivity balanced band-pass filter based on multimode resonators |
| CN106299560A (en) * | 2016-08-22 | 2017-01-04 | 淮阴工学院 | A kind of high selectivity broadband merit filter-divider |
| CN106972233A (en) * | 2017-05-10 | 2017-07-21 | 厦门大学 | A kind of four tunnel filtering type power splitters based on three line coupled structures |
| CN113451723A (en) * | 2021-09-01 | 2021-09-28 | 东南大学 | Broadband balun filter designed by utilizing half-mode slot line |
-
2021
- 2021-12-28 CN CN202111628157.5A patent/CN114284677A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934663A (en) * | 2015-06-23 | 2015-09-23 | 南京理工大学 | Broadband high-selectivity balanced band-pass filter based on multimode resonators |
| CN106299560A (en) * | 2016-08-22 | 2017-01-04 | 淮阴工学院 | A kind of high selectivity broadband merit filter-divider |
| CN106972233A (en) * | 2017-05-10 | 2017-07-21 | 厦门大学 | A kind of four tunnel filtering type power splitters based on three line coupled structures |
| CN113451723A (en) * | 2021-09-01 | 2021-09-28 | 东南大学 | Broadband balun filter designed by utilizing half-mode slot line |
Non-Patent Citations (2)
| Title |
|---|
| CHI FAN ET AL.: "Double-layer microstrip ultra-wideband filtering power divider with high selectivity and large isolation", 《INT J RF MICROW COMPUT AIDED ENG.》 * |
| HE ZHU ET AL.: "Design of Wideband In-Phase and Out-of-Phase Power Dividers Using Microstrip-to-Slotline Transitions and Slotline Resonators", 《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115473019A (en) * | 2022-08-09 | 2022-12-13 | 华南理工大学 | Filtering power divider with reconfigurable channel number and radio frequency front end |
| CN115473019B (en) * | 2022-08-09 | 2023-09-26 | 华南理工大学 | Filter power divider with reconfigurable arbitrary channel number and radio frequency front end |
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