CN110311203B - Unbalanced to balanced filtering power divider with broadband common mode rejection - Google Patents
Unbalanced to balanced filtering power divider with broadband common mode rejection Download PDFInfo
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Abstract
The invention discloses an unbalanced-to-balanced filtering power divider with broadband common mode rejection, which comprises an upper dielectric substrate, a lower dielectric substrate and a common metal ground, wherein the upper dielectric substrate is a dielectric substrate; an upper surface feeder line and a lower surface feeder line are respectively arranged on the upper layer medium substrate and the lower layer medium substrate, and are symmetrical relative to the common metal to jointly form a first input port feeder line; a rectangular defect area is etched on the position of the public metal ground corresponding to the feeder line of the first input port, and single-ended input is achieved in a matched mode; six half-mold fan-shaped defected ground structures are etched on the public metal ground, the six half-mold fan-shaped defected ground structures are divided into two groups, the two groups of half-mold fan-shaped defected ground structures are symmetrical about an axis where the first coupling line is located, the radius of each group of half-mold fan-shaped defected ground structures is gradually increased in a step shape along the direction of the central axis, and wide common mode rejection is achieved in a matching mode. The power division filter has the advantages of compact structure, wide-band common-mode rejection, high out-of-band selectivity and the like.
Description
Technical Field
The invention relates to a microwave passive device, in particular to an unbalanced-to-balanced filtering power divider with broadband common-mode rejection.
Background
The balanced circuit has a common mode rejection characteristic, so that system noise can be effectively reduced, crosstalk of circuit components is reduced, and more attention is paid to the balanced circuit in a communication system. Document 1 (w. Feng and w. Che, "Novel Wireless and differential band filtered structures on T-shaped structure," IEEE trans. micro w. the technology, vol. 60, No. 6, pp. 1560-. To solve the limitation of the above problem, a single-ended to balanced power divider was developed in document 3 (w. Zhang et al, "Novel planar compact-coupled-balanced-power divider," IEEE trans. micro. tool techn., vol. 65, No. 8, pp. 2953 and 2963, and aug. 2017). However, since there is no extra band-pass filtering capability, the common-mode rejection is narrow, and the pass-band selectivity and the harmonic rejection are poor.
Disclosure of Invention
The invention aims to provide an unbalanced-to-balanced filter power divider which has broadband common mode rejection and can be directly connected with a single-ended circuit and a balanced circuit.
The technical solution for realizing the purpose of the invention is as follows: a non-balanced to balanced filter power divider with broadband common mode rejection is of a three-layer structure with conductors inserted in the middle of double-sided parallel strip lines, and comprises an upper dielectric substrate, a lower dielectric substrate and a common metal ground; an upper surface feeder line and a lower surface feeder line are respectively arranged on the upper layer dielectric substrate and the lower layer dielectric substrate, and are symmetrical relative to the common metal to jointly form a first input port feeder line; the public metal ground is etched with a rectangular defect area at a position corresponding to the first input port feeder line, so that the first input port feeder line forms a double-sided parallel strip line, and single-ended input is realized; six half-mold fan-shaped defected ground structures are etched on the public metal ground, the six half-mold fan-shaped defected ground structures are divided into two groups, the two groups of half-mold fan-shaped defected ground structures are symmetrical about an axis where the first coupling line is located, the radius of each group of half-mold fan-shaped defected ground structures is gradually increased in a step shape along the direction of the central axis, and wide common mode suppression is achieved in a matching mode.
One end of the upper surface feeder line of the upper layer dielectric substrate is flush with the edge of the upper layer dielectric substrate, and the upper layer dielectric substrate is also provided with a first coupling line, a first open-circuit branch knot, a first isolation resistor, a first output port feeder line and a second output port feeder line, a first resonator and a second resonator, a second coupling line and a third coupling line which are symmetrically distributed relative to the axis where the upper surface feeder line is located; the first coupling line and the upper surface feeder line are in a straight line, one end of the first coupling line is connected with the upper surface feeder line, and the other end of the first coupling line is connected with the first open-circuit branch section; the first output port feeder line and the second output port feeder line are respectively connected with the second coupling line and the third coupling line; the first resonator and the second resonator adopt T-shaped dual-mode resonators, one branch of the first resonator and one branch of the second resonator are connected through the first isolation resistor and are coupled with the first coupling line, and the other branch of the first resonator and the other branch of the second resonator are coupled with the second coupling line and the third coupling line respectively.
The lower surface feeder line and the upper surface feeder line of the lower layer dielectric substrate are symmetrical relative to the common metal, one end of the lower surface feeder line and the upper surface feeder line are flush with the edge of the lower layer dielectric substrate, a fourth coupling line, a second open-circuit branch section, a second isolation resistor, a third output port feeder line and a fourth output port feeder line, a fifth coupling line and a sixth coupling line, and a third resonator and a fourth resonator are further arranged on the lower layer dielectric substrate, and the third output port feeder line and the fourth output port feeder line, the fifth coupling line and the sixth coupling line, the fifth; the fourth coupling line and the lower surface feeder line are in the same straight line, one end of the fourth coupling line is connected with the lower surface feeder line, and the other end of the fourth coupling line is connected with the second open-circuit branch section; the third output port feeder line and the fourth output port feeder line are respectively connected with the fifth coupling line and the sixth coupling line; the third resonator and the fourth resonator adopt a T-shaped dual-mode resonator, one branch of the third resonator and one branch of the fourth resonator are connected through a second isolation resistor and are coupled with the fourth coupling line, and the other branch of the third resonator and the other branch of the fourth resonator are coupled with the fifth coupling line and the sixth coupling line respectively.
One end of the fan-shaped defect area of the 6 half moulds is flush with the edge of the public metal ground to form an open end.
The first resonator, the second resonator, the third resonator and the fourth resonator are folded T-shaped dual-mode resonators, branches on two sides of each folded T-shaped dual-mode resonator are symmetrical relative to a middle branch, and an included angle between each branch and the middle branch is 45 degrees.
The third resonator and the first resonator, the fourth resonator and the second resonator, the fourth coupling line and the first coupling line, the fifth coupling line and the second coupling line, the sixth coupling line and the third coupling line, and the second open-circuit stub and the first open-circuit stub are all vertically symmetrical with respect to the common metal.
The first output port feeder line and the second output port feeder line are both parallel to the first coupling line, and the second coupling line and the third coupling line are both perpendicular to the first coupling line; and one side branches of the first resonator and the second resonator are parallel to the first coupling line and coupled with the first coupling line, and the other side branches of the first resonator and the second resonator are parallel to the second coupling line and the third coupling line respectively and coupled with the second coupling line and the third coupling line.
The third output port feeder line, the fourth output port feeder line, the fifth coupling line and the sixth coupling line are all perpendicular to the fourth coupling line; and the branches of one side of the third resonator and one side of the fourth resonator are parallel to the fourth coupling line and are coupled with the fourth coupling line, and the branches of the other side of the third resonator and one side of the fourth resonator are parallel to the fourth output port feeder line and the fifth coupling line and are coupled with the fourth output port feeder line and the fifth coupling line.
Two branches extend from the open end of the first open branch and are perpendicular to the first coupling line; and two branches extend from the open end of the second open branch and are perpendicular to the fourth coupling line.
The first input port (3) is a 50 ohm double-sided parallel stripline; the first output port feeder line (4), the second output port feeder line (5), the third output port feeder line (13) and the fourth output port feeder line (14) are 50 ohm microstrip lines.
Compared with the prior art, the invention has the following remarkable advantages: 1) according to the invention, a half-mode fan-shaped defected ground structure is introduced into the middle layer, and the unbalanced circuit and the balanced circuit can be directly connected without a conversion circuit, so that the size and the loss of the power division filter are reduced while the broadband common mode rejection is ensured; 2) the invention introduces open-circuit branches, realizes controllable transmission zero point through the length change of the branches, and improves out-of-band selectivity; 3) the invention connects the resonator through the isolation resistor, thereby ensuring good isolation between the two pairs of balanced output ports.
Drawings
Fig. 1 is a schematic perspective view of an unbalanced-to-balanced filter power divider with broadband common mode rejection according to the present invention.
Fig. 2 is a schematic diagram of the dimensions of the superstructure of an embodiment of the present invention.
Fig. 3 is a schematic diagram of intermediate common ground structure dimensions of an embodiment of the present invention.
Fig. 4 is a schematic diagram of the dimensions of the underlying structure of an embodiment of the invention.
Fig. 5 is a simulation diagram of the S parameter when the differential mode signal is input according to the embodiment of the present invention.
FIG. 6 is a simulation diagram of port isolation according to an embodiment of the present invention.
FIG. 7 is a simulation diagram of S-parameters when inputting a common mode signal according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
As shown in FIG. 1, the unbalanced-to-balanced filter power divider with broadband common mode rejection has a three-layer structure with conductors inserted in the middle of double-sided parallel strip lines, and comprises two dielectric substrates, an upper dielectric substrate (1) and a lower dielectric substrate (2), and a common metal ground (20) between the two dielectric substrates. An upper surface feeder line and a lower surface feeder line are respectively arranged on the upper layer dielectric substrate (1) and the lower layer dielectric substrate (2), the upper surface feeder line and the lower surface feeder line are symmetrical about a common metal ground (20) to jointly form a first input port feeder line (3), and a rectangular defect area (21) is etched on the common metal ground (20) at a position corresponding to the first input port feeder line (3), so that the first input port feeder line (3) forms a double-sided parallel strip line to realize single-ended input; first to sixth half-mold fan-shaped defected ground structures (22-27) are further etched on the common metal ground (20), the six half-mold fan-shaped defected ground structures are divided into two groups, and a rectangular defect area (21) and the first half-mold fan-shaped defected ground structure (22), the second half-mold fan-shaped defected ground structure (23), the third half-mold fan-shaped defected ground structure (24), the fourth half-mold fan-shaped defected ground structure (25), the fifth half-mold fan-shaped defected ground structure (26) and the sixth half-mold fan-shaped defected ground structure (27) are etched on the common metal ground (20); the first half-mold fan-shaped defect ground structure (22), the second half-mold fan-shaped defect ground structure (23) and the third half-mold fan-shaped defect ground structure (24) are in a group, the fourth half-mold fan-shaped defect ground structure (25), the fifth half-mold fan-shaped defect ground structure (26) and the sixth half-mold fan-shaped defect ground structure (27) are in a group, the two groups of half-mold fan-shaped defect ground structures are symmetrical about an axis where the first coupling line (8) is located, and the radius of each group of half-mold fan-shaped defect ground structures is gradually increased along the direction of the central axis to realize wide common mode suppression.
Furthermore, the upper-layer dielectric substrate (1) is further provided with a first output port feeder line (4), a second output port feeder line (5), a first resonator (6), a second resonator (7), a first coupling line (8), a second coupling line (9), a third coupling line (10), a first open-circuit branch (11) and a first isolation resistor (12); one end of the upper surface feeder line is flush with the edge of the upper layer dielectric substrate (1), one end of the upper surface feeder line is connected with the first coupling line (8), the first coupling line (8) and the upper surface feeder line are on the same straight line, and the other end of the first coupling line (8) is connected with the first open-circuit branch (11). The first output port feeder line (4) and the second output port feeder line (5) are symmetrically distributed relative to the axis of the upper surface feeder line and are respectively connected with the second coupling line (9) and the third coupling line (10). The first resonator (6) and the second resonator (7) are T-shaped dual-mode resonators and are symmetrically distributed about an axis where the upper surface feeder line is located, one branch of the first resonator (6) and one branch of the second resonator (7) are connected through the first isolation resistor (12) and are coupled with the first coupling line (8), and the other branch of the first resonator and the other branch of the second resonator are coupled with the second coupling line (9) and the third coupling line (10) respectively.
Furthermore, the first resonator (6) and the second resonator (7) are folded T-shaped dual-mode resonators, and branches on two sides of the first resonator are symmetrical about a middle branch, and an included angle between the two branches and the middle branch is 45 degrees.
Furthermore, the first output port feeder line (4) and the second output port feeder line (5) are both parallel to the first coupling line (8), and the second coupling line (9) and the third coupling line (10) are both perpendicular to the first coupling line (8).
Furthermore, one side branches of the first resonator (6) and the second resonator (7) are parallel to the first coupling line (8) and coupled with the first coupling line (8), and the other side branches are parallel to the second coupling line (9) and the third coupling line (10) and coupled with the second coupling line (9) and the third coupling line (10).
Furthermore, two branches extend from the open end of the first open-circuit branch (11) and are perpendicular to the first coupling line (8).
Furthermore, a third output port feeder line (13), a fourth output port feeder line (14), a fourth coupling line (15), a fifth coupling line (16), a sixth coupling line (17), a second open-circuit branch (18), a second isolation resistor (19), a third resonator (28) and a fourth resonator (29) are further arranged on the lower dielectric substrate (2); one end of the lower surface feeder line is flush with the edge of the lower layer dielectric substrate (2), one end of the lower surface feeder line is connected with a fourth coupling line (15), the fourth coupling line (15) and the lower surface feeder line are on the same straight line, and the other end of the fourth coupling line (15) is connected with a second open-circuit branch (18). The third output port feeder line (13) and the fourth output port feeder line (14) are symmetrically distributed relative to the axis of the lower surface feeder line and are respectively connected with a fifth coupling line (16) and a sixth coupling line (17). The third resonator (28) and the fourth resonator (29) adopt T-shaped dual-mode resonators and are symmetrically distributed about an axis where the lower surface feeder line is located, one branch of the third resonator (28) and one branch of the fourth resonator (29) are connected through the second isolation resistor (19) and are coupled with the fourth coupling line (15), and the other branch of the third resonator and the other branch of the fourth resonator are coupled with the fifth coupling line (16) and the sixth coupling line (17) respectively.
Furthermore, the third resonator (28) and the fourth resonator (29) are folded T-shaped dual-mode resonators, and branches on two sides of the third resonator are symmetrical about a middle branch, and an included angle between the third resonator and the middle branch is 45 degrees.
Further, the third resonator (28) and the first resonator (6), the fourth resonator (29) and the second resonator (7), the fourth coupling line (15) and the first coupling line (8), the fifth coupling line (16) and the second coupling line (9), the sixth coupling line (17) and the third coupling line (10), and the second open-circuit branch (18) and the first open-circuit branch (11) are all vertically symmetrical with respect to the common metal ground (20).
Furthermore, the third output port feeder line (13), the fourth output port feeder line (14), the fifth coupling line (16) and the sixth coupling line (17) are all perpendicular to the fourth coupling line (15).
Furthermore, the branches of one side of each of the third resonator (28) and the fourth resonator (29) are parallel to the fourth coupling line (15) and coupled to the fourth coupling line (15), and the branches of the other side of each of the third resonator and the fourth resonator are parallel to the fourth output port feeder line (14) and the fifth coupling line (16) and coupled to the fourth output port feeder line (14) and the fifth coupling line (16).
Furthermore, two branches extend from the open end of the second open-circuit branch (18) and are perpendicular to the fourth coupling line (15).
As a specific implementation, the relative dielectric constant of the dielectric substrate (1) and the dielectric substrate (2) can be 3.55, and the thickness can be 0.508 mm. The first input port (3) is a 50 ohm double-sided parallel stripline. The first output port feeder line (4), the second output port feeder line (5), the third output port feeder line (13) and the fourth output port feeder line (14) are 50 ohm microstrip lines.
Furthermore, the common metal ground (20) is of a rectangular structure, the long side of the common metal ground is perpendicular to the first coupling line (8), the wide side of the common metal ground is parallel to the first coupling line (8), and the length of the common metal ground is the sum of the lengths of the feeder line of the first input port (3) and the first coupling line (8). One end of each fan-shaped defect area (22-27) of the 6 half dies is flush with the long edge of the common metal ground (20) to form an open end, the length of the open end is increased in a step-shaped mode, and the open end can be adjusted according to requirements to achieve wider common mode rejection bandwidth.
The working principle of the miniaturized unbalanced-to-balanced filtering power divider with the broadband common mode rejection is as follows: when a differential mode signal flows in through a first input port (3), differential mode signals on the upper layer of a dielectric substrate (1) and the lower layer of the dielectric substrate (2) are transmitted through half-mode fan-shaped defected ground structures (22-27), the signals are coupled with resonators (6, (7, 28, 29) through coupling lines (8, 15) to excite two modes of a T-shaped resonator, the T-shaped resonator is coupled with the coupling lines (9, 10, 16, 17), the signals flow through the coupling lines to realize a band-pass filtering function and then are output through output port feeders (4, 14, 5, 13), a first output port and a third output port are a pair of balanced ports, a second output port and a fourth output port are a pair of balanced ports, and when a first isolation resistor (12) and a second isolation resistor (19) work, good isolation of the output ports can be realized, when a common mode signal flows in through the first input port (3), the transmission of common mode signals on the upper layer of the dielectric substrate (1) and the lower layer of the dielectric substrate (2) is blocked by the defected ground structures (21-27), so that the signals cannot be output from the balanced output ports, and the function of common mode rejection is realized.
Examples
In order to verify the effectiveness of the scheme of the present invention, the following power divider design is performed, and the structure thereof is shown in fig. 1. The dimensions are shown in fig. 2, 3 and 4. The dielectric substrates 1 and 2 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. 2, fig. 3, and fig. 4, the filter power divider has the following dimensional parameters: l =57mm, L1=18mm, L2=9.3mm, L3=8.9mm, L4=7.1mm, L5=4mm, L6=4.2mm, L7=9mm, L8=7mm, L9=6mm, L10=3mm, L11=13.8mm, L12= L1=18mm, W =19.2mm, W1=2.3mm, W2=1.2mm, W3=1.5mm, W4=0.8mm, W5=0.4mm, W6=15mm, W7=5.1mm, W8=0.1mm, W9=0.5mm, S1=0.2mm, S2=0.1 mm.
The present example was modeled in the electromagnetic simulation software hfss.18. Fig. 5 and 6 are simulation diagrams of S parameters when differential mode signals are input in the present example, where the first and fourth output ports form a differential port a, and the second and third output ports form a differential port B, as can be seen from fig. 5, the center frequency of the filter power divider is 5.8GHz, the relative bandwidth is 27.6%, the insertion loss in the pass band is better than-3.7 dB, the loss is lower, and two transmission zeros are respectively arranged on two sides of the pass band, so that the example has high selectivity, and as can be seen from fig. 6, the isolation between two pairs of differential ports is smaller than-15 dB.
FIG. 7 is a simulation diagram of S-parameters when differential mode signals are input in the present embodiment, and it can be seen from the simulation diagram that the common mode rejection reaches below-30 dB in the range of 2-10GHz, and the effect of broadband common mode rejection is achieved.
In summary, the miniaturized unbalanced-to-balanced filter power divider with broadband common mode rejection realizes the functions of unbalanced-to-balanced circuit conversion, differential power division, broadband common mode rejection and filtering on the premise of ensuring miniaturization, can be directly connected with an unbalanced circuit and a balanced circuit, and is very suitable for modern wireless communication systems.
Claims (9)
1. The unbalanced-to-balanced filtering power divider with the broadband common mode rejection is characterized by having a three-layer structure with conductors inserted in the middle of double-sided parallel strip lines, and comprising an upper-layer dielectric substrate (1), a lower-layer dielectric substrate (2) and a common metal ground (20); an upper surface feeder line and a lower surface feeder line are respectively arranged on the upper layer dielectric substrate (1) and the lower layer dielectric substrate (2), and are symmetrical relative to a common metal ground (20) to jointly form a first input port feeder line (3); one end of an upper surface feeder line of the upper layer dielectric substrate (1) is flush with the edge of the upper layer dielectric substrate (1), a first coupling line (8), a first open-circuit branch (11), a first isolation resistor (12), a first output port feeder line (4) and a second output port feeder line (5), a first resonator (6) and a second resonator (7), and a second coupling line (9) and a third coupling line (10) which are symmetrically distributed about the axis where the upper surface feeder line is located are further arranged on the upper layer dielectric substrate (1); the first coupling line (8) and the upper surface feeder line are on the same straight line, one end of the first coupling line is connected with the upper surface feeder line, and the other end of the first coupling line is connected with the first open-circuit branch section (11); the first output port feeder line (4) and the second output port feeder line (5) are respectively connected with the second coupling line (9) and the third coupling line (10); the first resonator (6) and the second resonator (7) adopt a T-shaped dual-mode resonator, one branch of the first resonator (6) and one branch of the second resonator (7) are connected through a first isolation resistor (12) and are coupled with a first coupling line (8), and the other branch of the first resonator and the other branch of the second resonator are coupled with a second coupling line (9) and a third coupling line (10) respectively; the common metal ground (20) is etched with a rectangular defect area (21) at a position corresponding to the first input port feeder line (3), so that the first input port feeder line (3) forms a double-sided parallel strip line to realize single-ended input; six half-mold fan-shaped defected ground structures (22-27) are further etched on the public metal ground (20), the six half-mold fan-shaped defected ground structures are divided into two groups, the two groups of half-mold fan-shaped defected ground structures are symmetrical about an axis where the first coupling line (8) is located, the radius of each group of half-mold fan-shaped defected ground structures is increased in a step shape along the direction of the central axis, and broadband common mode suppression is achieved in a matching mode.
2. The unbalanced-to-balanced filter power divider with broadband common-mode rejection according to claim 1, wherein the lower surface feeder line and the upper surface feeder line of the lower dielectric substrate (3) are symmetrical about a common metal ground (20), and one end of the lower surface feeder line and one end of the upper surface feeder line are flush with the edge of the lower dielectric substrate (3), a fourth coupling line (15), a second open branch (18), a second isolation resistor (19) are further disposed on the lower dielectric substrate (3), and a third output port feeder line (13) and a fourth output port feeder line (14), a fifth coupling line (16) and a sixth coupling line (17), a third resonator (28) and a fourth resonator (29) are symmetrically distributed about the axis of the lower surface feeder line; the fourth coupling line (15) and the lower surface feeder line are in the same straight line, one end of the fourth coupling line is connected with the lower surface feeder line, and the other end of the fourth coupling line is connected with the second open-circuit branch section (18); the third output port feeder line (13) and the fourth output port feeder line (14) are respectively connected with a fifth coupling line (16) and a sixth coupling line (17); the third resonator (28) and the fourth resonator (29) adopt a T-shaped dual-mode resonator, one branch of the third resonator (28) and one branch of the fourth resonator (29) are connected through a second isolation resistor (19) and are coupled with a fourth coupling line (15), and the other branch of the third resonator and the other branch of the fourth resonator are coupled with a fifth coupling line (16) and a sixth coupling line (17) respectively.
3. The balun-to-balanced filter power divider with broadband common-mode rejection according to claim 1, wherein one end of the 6 half-mold fan-shaped defect areas (22-27) is flush with the edge of the common metal ground (20) to form an open end.
4. The balun with broadband common-mode rejection to balanced filtering power divider as claimed in claim 2, wherein the first resonator (6), the second resonator (7), the third resonator (28) and the fourth resonator (29) are folded T-shaped dual-mode resonators, and two side branches of the resonators are symmetric with respect to a middle branch and form an angle of 45 degrees with the middle branch.
5. The balun with broadband common-mode rejection to balanced filtering power divider according to claim 2, wherein the third resonator (28) and the first resonator (6), the fourth resonator (29) and the second resonator (7), the fourth coupling line (15) and the first coupling line (8), the fifth coupling line (16) and the second coupling line (9), the sixth coupling line (17) and the third coupling line (10), and the second open-circuit branch (18) and the first open-circuit branch (11) are all vertically symmetric about the common metal ground (20).
6. The unbalanced to balanced filter power divider with broadband common-mode rejection according to claim 1, wherein the first and second output port feed lines (4, 5) are parallel to the first coupling line (8), and the second and third coupling lines (9, 10) are perpendicular to the first coupling line (8); branches on one side of the first resonator (6) and the second resonator (7) are parallel to the first coupling line (8) and coupled with the first coupling line (8), and branches on the other side of the first resonator are parallel to the second coupling line (9) and the third coupling line (10) and coupled with the second coupling line (9) and the third coupling line (10).
7. The unbalanced to balanced filter power divider with broadband common-mode rejection according to claim 2, wherein the third output port feed line (13), the fourth output port feed line (14), the fifth coupling line (16), and the sixth coupling line (17) are all perpendicular to the fourth coupling line (15); branches of one side of each of the third resonator (28) and the fourth resonator (29) are parallel to the fourth coupling line (15) and coupled with the fourth coupling line (15), and branches of the other side of each of the third resonator and the fourth resonator are parallel to the fourth output port feeder line (14) and the fifth coupling line (16) and coupled with the fourth output port feeder line (14) and the fifth coupling line (16).
8. The unbalanced to balanced filter power divider with broadband common-mode rejection according to claim 2, wherein the open end of the first open-circuit branch (11) extends to form two branches, and the two branches are perpendicular to the first coupling line (8); and two branches extend from the open end of the second open branch (18) and are perpendicular to the fourth coupling line (15).
9. The unbalanced to balanced filter power divider with broadband common-mode rejection according to claim 2, characterized in that the first input port (3) is a 50 ohm double-sided parallel stripline; the first output port feeder line (4), the second output port feeder line (5), the third output port feeder line (13) and the fourth output port feeder line (14) are 50 ohm microstrip lines.
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| 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 |
| CN113964467B (en) * | 2021-10-25 | 2022-05-17 | 金陵科技学院 | Balance-unbalanced type in-phase filtering power divider based on three-wire coupling |
| CN114256583B (en) * | 2021-12-10 | 2023-03-14 | 中国电子科技集团公司第三十八研究所 | DSPSL-based four-way reversed-phase Gysel power divider |
| CN114824703B (en) * | 2022-05-25 | 2023-12-01 | 安徽华东光电技术研究所有限公司 | Dual-passband stop-band filter based on defected ground structure |
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| CN101459269A (en) * | 2009-01-04 | 2009-06-17 | 上海大学 | Low-pass filter based on defect ground structure |
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