CN112103610A - Balanced multimode band-pass filter - Google Patents
Balanced multimode band-pass filter Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
- H01P7/105—Multimode resonators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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- H01P1/203—Strip line filters
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Abstract
The invention belongs to the technical field of microwave communication, and particularly relates to a balanced multimode band-pass filter. The metal floor board comprises a dielectric substrate and a metal floor board which are stacked up and down, wherein the upper surface of the dielectric substrate is provided with a first input microstrip line, a second input microstrip line, a first loading short-circuit stub step impedance resonator, a second loading short-circuit stub step impedance resonator, a first output microstrip line and a second output microstrip line; the first loading short-circuit stub step impedance resonator and the second loading short-circuit stub step impedance resonator are symmetrical relative to the central line of the dielectric substrate; the first input microstrip line and the second input microstrip line are symmetrical relative to the central line of the first loading short circuit stub step impedance resonator; the first output microstrip line and the second output microstrip line are symmetrical relative to the central line of the second loading short-circuit stub step impedance resonator. The structure of loading the short branch knot and the resistor cascade connection in the middle of the resonator realizes the effective inhibition of common-mode signals in a wide frequency band range, and does not influence the transmission of differential signals.
Description
Technical Field
The invention belongs to the technical field of microwave communication, and particularly relates to a balanced multimode band-pass filter.
Background
With the continuous development of modern communication systems, radar systems, measurement systems, etc., microwave filters have become an indispensable and important component of the systems. Among them, the balanced bandpass filter has better noise immunity and anti-electromagnetic interference ability than the conventional single-ended filter in a circuit or a system, and the balanced bandpass filter has attracted more and more attention of researchers in the past years. The balanced filter is mainly designed and realized by a half-wavelength resonator, and is also designed and realized by a substrate integrated waveguide, a defected ground structure and a coupled line structure. However, these filters are designed using single-mode resonators, and if a dual-mode or multi-mode response is to be achieved, a corresponding number of resonators is required. In order to comply with the trend of miniaturization and integration of modern microwave circuits, research on multimode filters, of which multimode resonators are important constituents, has been receiving attention. Multimode resonators, as the name implies, are resonators that can achieve multiple modes of response. The number of resonators can be reduced in the design of the multimode filter, thereby reducing the circuit size. Currently, a variety of multimode resonators have been proposed in the design of conventional single-ended multimode filters. However, less research is currently being conducted on balanced multimode filters.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the balanced type multimode band-pass filter which realizes multimode response by loading the short-circuit branch on the basis of the traditional step impedance resonator and effectively realizes the common-mode signal suppression by adopting a structure of loading the short-circuit branch in the middle and cascading with the resistor in the aspect of common-mode signal suppression.
In order to achieve the purpose, the invention adopts the following technical scheme:
a balanced multimode band-pass filter comprises a dielectric substrate and a metal floor which are stacked up and down, wherein the upper surface of the dielectric substrate is provided with a first input microstrip line, a second input microstrip line, a first loading short-circuit stub step impedance resonator, a second loading short-circuit stub step impedance resonator, a first output microstrip line and a second output microstrip line; the first loading short-circuit stub step impedance resonator and the second loading short-circuit stub step impedance resonator are symmetrical relative to the central line of the dielectric substrate; the open end of the first loading short-circuit stub step impedance resonator is coupled to the open end of the second loading short-circuit stub step impedance resonator in parallel; the first input microstrip line and the second input microstrip line are a pair of differential pairs; the first input microstrip line and the second input microstrip line are symmetrical relative to the central line of the first loading short circuit stub step impedance resonator; the first output microstrip line and the second output microstrip line are a pair of differential pairs; the first output microstrip line and the second output microstrip line are symmetrical relative to the central line of the second loading short circuit stub step impedance resonator; the dielectric substrate is provided with a first metalized through hole, a second metalized through hole, a third metalized through hole, a fourth metalized through hole, a fifth metalized through hole and a sixth metalized through hole which are vertically communicated; the first loading short-circuit stub step impedance resonator is connected with the metal floor on the lower surface of the dielectric substrate through a first metalized through hole, a second metalized through hole and a third metalized through hole respectively; and the second loading short-circuit stub step impedance resonator is connected with the metal floor on the lower surface of the dielectric substrate through a fourth metalized through hole, a fifth metalized through hole and a sixth metalized through hole respectively.
As a preferred technical scheme of the invention: the first loaded short-circuit stub step impedance resonator comprises a first step part, a second step part, a third step part, a first loaded short-circuit stub, a second loaded short-circuit stub, a third loaded stub and a first resistor; two ends of the first step part are vertically bent; one end of the first step part is connected with one end of the second step part; the first loaded short circuit branch is vertically loaded at the connecting end of the first step part and the second step part; the other end of the first step part is connected with one end of the third step part; the second loaded short circuit branch is vertically loaded at the connecting end of the first step part and the third step part; the other end of the second step part and the other end of the third step part are both vertically bent; the third loading branch is connected with the first resistor in series and is loaded at the middle position of the first step part; the tail end of the first loaded short-circuit branch knot is connected with a metal floor on the lower surface of the medium substrate through a first metalized through hole; the tail end of the second loaded short-circuit branch knot is connected with the metal floor on the lower surface of the medium substrate through a second metalized through hole; one end of the first resistor is connected with the metal floor on the lower surface of the medium substrate through a third metalized through hole; the second loaded short-circuit stub step-impedance resonator comprises a fourth step part, a fifth step part, a sixth step part, a fourth loaded short-circuit stub, a fifth loaded short-circuit stub, a sixth loaded stub and a second resistor; two ends of the fourth step part are vertically bent; one end of the fourth step part is connected with one end of the fifth step part; the fourth loaded short circuit branch knot is vertically loaded at the connecting end of the fourth step part and the fifth step part; the other end of the fourth step part is connected with one end of the sixth step part; the fifth loaded short circuit branch knot is vertically loaded at the connecting end of the fourth step part and the sixth step part; the other end of the fifth step part and the other end of the sixth step part are both vertically bent; the sixth loading branch knot is connected with the second resistor in series and loaded in the middle of the fourth step part; the tail end of the fourth loaded short-circuit branch knot is connected with the metal floor on the lower surface of the medium substrate through a fourth metalized through hole; the tail end of the fifth loaded short circuit branch is connected with the metal floor on the lower surface of the dielectric substrate through a fifth metalized through hole; one end of the second resistor is connected with the metal floor on the lower surface of the dielectric substrate through a sixth metalized through hole; the first input microstrip line and the second input microstrip line are symmetrical about a central line of the middle position of the first step part; the first output microstrip line and the second output microstrip line are symmetrical with respect to a center line of a middle position of the fourth step part.
As a preferred technical scheme of the invention: the other end of the second step part is an open end of the second step part; the other end of the fifth step part is an open end of the fifth step part; the other end of the third step part is an open end of the third step part; the other end of the sixth step part is an open end of the sixth step part; the open end of the second step part is coupled to the open end of the fifth step part in parallel; the open end of the third step portion is coupled in parallel with the open end of the sixth step portion.
As a preferred technical scheme of the invention: the first input microstrip line comprises a first microstrip line and a first main transmission line; one end of the first microstrip line is vertically connected with one end of the first main transmission line; the second input microstrip line comprises a second microstrip line and a second main transmission line; one end of the second microstrip line is vertically connected with one end of the second main transmission line; the other end of the first main transmission line is vertically bent and coupled to the first step part in parallel; the other end of the second main transmission line is vertically bent and coupled to the first step part in parallel.
As a preferred technical scheme of the invention: the first output microstrip line comprises a third microstrip line and a third main transmission line; one end of the third microstrip line is vertically connected with one end of the third main transmission line; the second output microstrip line comprises a fourth microstrip line and a fourth main transmission line; one end of the fourth microstrip line is vertically connected with one end of the fourth main transmission line; the other end of the third main transmission line is vertically bent and coupled to the fourth step part in parallel; the other end of the fourth main transmission line is vertically bent and coupled in parallel to the fourth step.
As a preferred technical scheme of the invention: the first microstrip line and the second microstrip line are both 50 ohm microstrip lines.
As a preferred technical scheme of the invention: the third microstrip line and the fourth microstrip line are both 50 ohm microstrip lines.
As a preferred technical scheme of the invention: the dielectric substrate is made of a Rogers4003C printed circuit board material.
Compared with the prior art, the balanced multimode band-pass filter adopting the technical scheme has the following technical effects:
1. the loaded short-circuit stub step impedance resonator provided by the invention can realize multi-mode resonance through the loaded short-circuit stub, and further can be used for realizing a balanced multi-mode band-pass filter.
2. The resonator can be reasonably bent to realize the miniaturization of the balanced filter.
3. In the aspect of common-mode signal suppression, the effective suppression of common-mode signals in a broadband range is realized by adopting a structure of loading short branches and resistors in the middle of a resonator in a cascade connection mode, and meanwhile, the differential signal transmission is not influenced.
4. By controlling the parameters corresponding to the structures of all parts, the balanced multimode band-pass filter can realize and meet different parameter indexes.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of multiple layers of the present invention;
FIG. 3 is a schematic illustration of dimensional parameters of an embodiment of the present invention;
FIG. 4 is a graphical illustration of a parameter curve for an embodiment of the present invention;
in the drawings, 1-dielectric substrate; 2-a first input microstrip line; 3-a second input microstrip line; 4-a first loaded short-circuited stub step-impedance resonator; 5-a second loaded short-circuited stub step-impedance resonator; 6-a first output microstrip line; 7-a second output microstrip line; 8-metal floor; 21-a first microstrip line; 22-a first main transmission line; 31-a second microstrip line; 32-a second main transmission line; 41-a first step; 42-first loaded short circuit branch; 43-a second step; 44-a first metallized via; 45-a second metallized via; 46-third loading branch; 47-first resistance; 48-third metallized vias; 49-second loaded short circuit branch; 410-a third step; 51-fourth step; 52-fourth loaded short circuit branch; 53-fifth step; 54-a fourth metallized via; 55-fifth metallized via; 56-sixth loading limb; 57-a second resistor; 58-sixth metalized via; 59-fifth loaded short circuit branch; 510-sixth step; 61-a third microstrip line; 62-a third main transmission line; 71-a fourth microstrip line; 72-fourth main transmission line.
Detailed Description
The present invention will be further explained with reference to the drawings so that those skilled in the art can more deeply understand the present invention and can carry out the present invention, but the present invention will be explained below by referring to examples, which are not intended to limit the present invention.
As shown in fig. 1 and fig. 2, a balanced multimode bandpass filter includes a dielectric substrate 1 and a metal floor 8 stacked up and down, where the upper surface of the dielectric substrate 1 is provided with a first input microstrip line 2, a second input microstrip line 3, a first loaded short-circuit stub step-impedance resonator 4, a second loaded short-circuit stub step-impedance resonator 5, a first output microstrip line 6, and a second output microstrip line 7; the first loading short-circuit stub step impedance resonator 4 and the second loading short-circuit stub step impedance resonator 5 are symmetrical relative to the central line of the dielectric substrate 1; the open end of the first loading short-circuit stub step impedance resonator 4 is coupled in parallel with the open end of the second loading short-circuit stub step impedance resonator 5; the first input microstrip line 2 and the second input microstrip line 3 form a pair of differential pairs; the first input microstrip line 2 and the second input microstrip line 3 are symmetrical about the central line of the first loading short circuit stub step impedance resonator 4; the first output microstrip line 6 and the second output microstrip line 7 form a pair of differential pairs; the first output microstrip line 6 and the second output microstrip line 7 are symmetrical with respect to the central line of the second loading short-circuit stub step impedance resonator 5; the dielectric substrate 1 is provided with a first metalized through hole 44, a second metalized through hole 45, a third metalized through hole 48, a fourth metalized through hole 54, a fifth metalized through hole 55 and a sixth metalized through hole 58 which are vertically penetrated; the first loading short-circuit stub step impedance resonator 4 is respectively connected with the metal floor 8 on the lower surface of the dielectric substrate 1 through a first metalized through hole 44, a second metalized through hole 45 and a third metalized through hole 48; the second loaded short-circuit stub step impedance resonator 5 is connected with the metal floor 8 on the lower surface of the dielectric substrate 1 through a fourth metalized through hole 54, a fifth metalized through hole 55 and a sixth metalized through hole 58.
The first loaded short-circuited stub stepped-impedance resonator 4 includes a first step portion 41, a second step portion 43, a third step portion 410, a first loaded short-circuited stub 42, a second loaded short-circuited stub 49, a third loaded stub 46, and a first resistor 47; both ends of the first step portion 41 are vertically bent; one end of the first step portion 41 is connected to one end of the second step portion 43; the first loaded short circuit branch 42 is vertically loaded at the connection end of the first step part 41 and the second step part 43; the other end of the first step portion 41 is connected to one end of the third step portion 410; the second loaded short circuit branch 49 is loaded vertically at the connection end of the first step portion 41 and the third step portion 410; the other end of the second step portion 43 and the other end of the third step portion 410 are both vertically bent; the third loading branch 46 is connected with the first resistor 47 in series and is loaded at the middle position of the first step part 41; the tail end of the first loaded short-circuit branch knot 42 is connected with the metal floor 8 on the lower surface of the dielectric substrate 1 through a first metalized through hole 44; the tail end of the second loaded short circuit branch 49 is connected with the metal floor 8 on the lower surface of the medium substrate 1 through a second metalized through hole 45; one end of the first resistor 47 is connected with the metal floor 8 on the lower surface of the dielectric substrate 1 through a third metalized through hole 48; the second loaded short-circuited stub step-impedance resonator 5 includes a fourth step 51, a fifth step 53, a sixth step 510, a fourth loaded short-circuited stub 52, a fifth loaded short-circuited stub 59, a sixth loaded stub 56, and a second resistor 57; both ends of the fourth stepped portion 51 are vertically bent; one end of the fourth step portion 51 is connected to one end of the fifth step portion 53; the fourth loaded short circuit branch 52 is vertically loaded at the connection end of the fourth step 51 and the fifth step 53; the other end of the fourth step portion 51 is connected to one end of the sixth step portion 510; the fifth loaded short circuit branch 59 is loaded vertically at the connection end of the fourth step part 51 and the sixth step part 510; the other end of the fifth step portion 53 and the other end of the sixth step portion 510 are both vertically bent; the sixth loading branch 56 is connected in series with the second resistor 57 and is loaded in the middle of the fourth step 51; the tail end of the fourth loaded short circuit branch knot 52 is connected with the metal floor 8 on the lower surface of the dielectric substrate 1 through a fourth metalized through hole 54; the tail end of the fifth loaded short-circuit branch 59 is connected with the metal floor 8 on the lower surface of the medium substrate 1 through a fifth metallized through hole 55; one end of the second resistor 57 is connected with the metal floor 8 on the lower surface of the dielectric substrate 1 through a sixth metalized through hole 58; the first input microstrip line 2 and the second input microstrip line 3 are symmetrical about the central line of the middle position of the first step part 41; the first output microstrip line 6 and the second output microstrip line 7 are symmetrical with respect to the center line of the middle position of the fourth step 51.
The other end of the second step portion 43 is an open end of the second step portion 43; the other end of the fifth step 53 is an open end of the fifth step 53; the other end of the third step portion 410 is an open end of the third step portion 410; the other end of the sixth stepped portion 510 is an open end of the sixth stepped portion 510; the open end of the second step portion 43 is coupled in parallel to the open end of the fifth step portion 43; the open end of the third step portion 410 is coupled in parallel to the open end of the sixth step portion 510.
The first input microstrip line 2 comprises a first microstrip line 21 and a first main transmission line 22; one end of the first microstrip line 21 is vertically connected with one end of the first main transmission line 22; the second input microstrip line 3 comprises a second microstrip line 31 and a second main transmission line 32; one end of the second microstrip line 31 is vertically connected with one end of the second main transmission line 32; the other end of the first main transmission line 22 is vertically bent and coupled in parallel to the first step portion 41; the other end of the second main transmission line 32 is vertically bent and coupled in parallel to the first step portion 41. The first output microstrip line 6 comprises a third microstrip line 61 and a third main transmission line 62; one end of the third microstrip line 61 is vertically connected to one end of the third main transmission line 62; the second output microstrip line 7 comprises a fourth microstrip line 71 and a fourth main transmission line 72; one end of the fourth microstrip line 71 is vertically connected to one end of the fourth main transmission line 72; the other end of the third main transmission line 62 is vertically bent and coupled in parallel to the fourth step 51; the other end of the fourth main transmission line 72 is vertically bent and coupled in parallel to the fourth stepped portion 51. The first microstrip line 21 and the second microstrip line 31 are both 50 ohm microstrip lines. The third microstrip line 61 and the fourth microstrip line 71 both adopt 50-ohm microstrip lines. The dielectric substrate 1 is made of Rogers4003C printed circuit board material.
The balanced multimode band-pass filter provided by the invention comprises two coupled step impedance resonators loaded with short circuit branches and two pairs of differential feed structures, and is in an up-and-down symmetrical structure along a symmetrical line. The ports of the first input microstrip line 2 and the second input microstrip line 3 are a pair of differential pair feed ports, and the ports of the first output microstrip line 6 and the second output microstrip line 7 are another pair of differential pair feed ports. The dielectric substrate of Rogers4003c model is adopted, the dielectric constant is 3.38, the thickness is 0.813mm, and the loss tangent value is 0.0027.
Table 1 lists the main parameter indices of the filter design.
Wherein f is0To show the inventionThe center frequency of the proposed balanced multi-mode band filter, FBW represents the relative bandwidth of the proposed balanced multi-mode band filter, and
and
respectively showing the differential mode echo coefficient and the common mode signal rejection of the balanced multi-mode band filter proposed by the present invention.
TABLE 1 Main parameter index of Filter
The invention further realizes the suppression of the common-mode signal by adopting a mode of middle loading short branch knot and resistor cascade. As shown in fig. 3, the dimension parameters of the designed circuit structure obtained through simulation optimization are as follows: w1＝1.86mm,W2＝3.7mm,W3＝0.8mm, W4＝2.4mm，l1＝5.6mm,l2＝16.9mm,l3＝5mm,l4＝6.7mm,l5＝14mm,l6＝2mm，l7＝41.6mm， g＝0.15mm，g10.15 mm. The size of the branch loaded in the middle of the corresponding resonator for suppressing the common mode signal is 0.3mm multiplied by 9 mm, and the loaded resistance value is 40 omega. Fig. 4 shows the result after the final optimization. It can be seen that the design implements a balanced multi-mode filter with a center frequency of 2GHz, with an FBW of about 35%, a differential mode echo coefficient better than-22 dB, and a common mode signal rejection below-26 dB in the differential passband.
The loaded short-circuit stub step impedance resonator provided by the invention can realize multi-mode resonance through the loaded short-circuit stub, and further can be used for designing and realizing a balanced multi-mode band-pass filter. The resonator can be reasonably bent to realize the miniaturization of the balanced filter. In the aspect of common-mode signal suppression, the effective suppression of common-mode signals in a broadband range is realized by adopting a structure of loading short branches and resistors in the middle of a resonator in a cascade connection mode, and meanwhile, the differential signal transmission is not influenced. By controlling the parameters corresponding to the structures of all parts, the balanced multimode band-pass filter can realize and meet different parameter indexes.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention, and are not intended to limit the scope of the present invention, and any person skilled in the art should understand that equivalent changes and modifications made without departing from the concept and principle of the present invention should fall within the protection scope of the present invention.
Claims (8)
1. A balanced multimode band-pass filter comprises a dielectric substrate (1) and a metal floor (8) which are stacked up and down, and is characterized in that a first input microstrip line (2), a second input microstrip line (3), a first loading short-circuit stub step-impedance resonator (4), a second loading short-circuit stub step-impedance resonator (5), a first output microstrip line (6) and a second output microstrip line (7) are arranged on the upper surface of the dielectric substrate (1); the first loading short-circuit stub step impedance resonator (4) and the second loading short-circuit stub step impedance resonator (5) are symmetrical relative to the central line of the dielectric substrate (1); the open end of the first loading short-circuit stub step impedance resonator (4) is coupled to the open end of the second loading short-circuit stub step impedance resonator (5) in parallel; the first input microstrip line (2) and the second input microstrip line (3) are a pair of differential pairs; the first input microstrip line (2) and the second input microstrip line (3) are symmetrical with respect to the central line of the first loading short-circuit stub step impedance resonator (4); the first output microstrip line (6) and the second output microstrip line (7) are a pair of differential pairs; the first output microstrip line (6) and the second output microstrip line (7) are symmetrical with respect to the central line of the second loading short-circuit stub step impedance resonator (5); the dielectric substrate (1) is provided with a first metalized through hole (44), a second metalized through hole (45), a third metalized through hole (48), a fourth metalized through hole (54), a fifth metalized through hole (55) and a sixth metalized through hole (58) which are vertically communicated; the first loading short-circuit stub step impedance resonator (4) is connected with a metal floor (8) on the lower surface of the dielectric substrate (1) through a first metalized through hole (44), a second metalized through hole (45) and a third metalized through hole (48) respectively; and the second loading short-circuit stub step impedance resonator (5) is connected with the metal floor (8) on the lower surface of the dielectric substrate (1) through a fourth metalized through hole (54), a fifth metalized through hole (55) and a sixth metalized through hole (58).
2. The balanced multimode bandpass filter according to claim 1, characterized in that the first loaded short-circuited stub stepped-impedance resonator (4) comprises a first step (41), a second step (43), a third step (410), a first loaded short-circuited stub (42), a second loaded short-circuited stub (49), a third loaded stub (46) and a first resistor (47); two ends of the first step part (41) are vertically bent; one end of the first step part (41) is connected with one end of the second step part (43); the first loaded short circuit branch (42) is vertically loaded at the connecting end of the first step part (41) and the second step part (43); the other end of the first step part (41) is connected with one end of a third step part (410); the second loaded short circuit branch (49) is vertically loaded at the connecting end of the first step part (41) and the third step part (410); the other end of the second step part (43) and the other end of the third step part (410) are both vertically bent; the third loading branch (46) is connected with the first resistor (47) in series and is loaded at the middle position of the first step part (41); the tail end of the first loaded short circuit branch (42) is connected with a metal floor (8) on the lower surface of the dielectric substrate (1) through a first metalized through hole (44); the tail end of the second loaded short circuit branch (49) is connected with a metal floor (8) on the lower surface of the dielectric substrate (1) through a second metalized through hole (45); one end of the first resistor (47) is connected with the metal floor (8) on the lower surface of the dielectric substrate (1) through a third metalized through hole (48); the second loading short-circuit branch step impedance resonator (5) comprises a fourth step part (51), a fifth step part (53), a sixth step part (510), a fourth loading short-circuit branch (52), a fifth loading short-circuit branch (59), a sixth loading branch (56) and a second resistor (57); both ends of the fourth step part (51) are vertically bent; one end of the fourth step part (51) is connected with one end of the fifth step part (53); the fourth loaded short-circuit branch knot (52) is vertically loaded at the connecting end of the fourth step part (51) and the fifth step part (53); the other end of the fourth step part (51) is connected with one end of a sixth step part (510); the fifth loaded short-circuit branch knot (59) is vertically loaded at the connecting end of the fourth step part (51) and the sixth step part (510); the other end of the fifth step part (53) and the other end of the sixth step part (510) are vertically bent; the sixth loading branch knot (56) is connected with the second resistor (57) in series and is loaded in the middle of the fourth step part (51); the tail end of the fourth loaded short circuit branch (52) is connected with a metal floor (8) on the lower surface of the dielectric substrate (1) through a fourth metalized through hole (54); the tail end of the fifth loaded short-circuit branch knot (59) is connected with a metal floor (8) on the lower surface of the dielectric substrate (1) through a fifth metalized through hole (55); one end of the second resistor (57) is connected with the metal floor (8) on the lower surface of the dielectric substrate (1) through a sixth metalized through hole (58); the first input microstrip line (2) and the second input microstrip line (3) are symmetrical about the central line of the middle position of the first step part (41); the first output microstrip line (6) and the second output microstrip line (7) are symmetrical about the center line of the middle position of the fourth step part (51).
3. The balanced multimode bandpass filter according to claim 2, characterized in that the other end of the second step portion (43) is an open end of the second step portion (43); the other end of the fifth step (53) is an open end of the fifth step (53); the other end of the third step part (410) is an open end of the third step part (410); the other end of the sixth stepped part (510) is an open end of the sixth stepped part (510); the open end of the second step part (43) is coupled in parallel with the open end of the fifth step part (53); the open end of the third step portion (410) is coupled in parallel to the open end of the sixth step portion (510).
4. The balanced multimode bandpass filter according to claim 2, characterized in that the first input microstrip line (2) comprises a first microstrip line (21), a first main transmission line (22); one end of the first microstrip line (21) is vertically connected with one end of the first main transmission line (22); the second input microstrip line (3) comprises a second microstrip line (31) and a second main transmission line (32); one end of the second microstrip line (31) is vertically connected with one end of the second main transmission line (32); the other end of the first main transmission line (22) is vertically bent and coupled to the first step part (41) in parallel; the other end of the second main transmission line (32) is vertically bent and coupled in parallel to the first step portion (41).
5. The balanced multimode bandpass filter according to claim 2, characterized in that the first output microstrip line (6) comprises a third microstrip line (61), a third main transmission line (62); one end of the third microstrip line (61) is vertically connected with one end of the third main transmission line (62); the second output microstrip line (7) comprises a fourth microstrip line (71) and a fourth main transmission line (72); one end of the fourth microstrip line (71) is vertically connected with one end of a fourth main transmission line (72); the other end of the third main transmission line (62) is vertically bent and coupled to the fourth step part (51) in parallel; the other end of the fourth main transmission line (72) is vertically bent and coupled in parallel to the fourth step (51).
6. The balanced multimode bandpass filter according to claim 4, characterized in that the first microstrip line (21) and the second microstrip line (31) are both 50 ohm microstrip lines.
7. The balanced multimode bandpass filter according to claim 5, characterized in that the third microstrip line (61) and the fourth microstrip line (71) are both 50 ohm microstrip lines.
8. The balanced multimode bandpass filter according to claim 2, characterized in that the dielectric substrate (1) is made of Rogers4003C printed circuit board material.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112909460A (en) * | 2021-01-18 | 2021-06-04 | 电子科技大学 | Balanced microstrip filter with common-mode and differential-mode signal reflection-free characteristics |
| CN114725635A (en) * | 2022-05-06 | 2022-07-08 | 华东交通大学 | Double-frequency balance filter |
| CN114843728A (en) * | 2022-04-06 | 2022-08-02 | 大连海事大学 | Balanced band-pass filter with input end having differential mode and common mode reflection-free characteristics |
| CN115133280A (en) * | 2022-07-27 | 2022-09-30 | 重庆邮电大学 | Differential broadband filtering antenna |
| CN116598738A (en) * | 2023-07-17 | 2023-08-15 | 成都华兴汇明科技有限公司 | Four-port frequency-selecting network and microwave oscillator constructed by same |
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| CN111755787A (en) * | 2020-07-15 | 2020-10-09 | 桂林电子科技大学 | High-performance multimode double-broadband filter |
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| CN111755787A (en) * | 2020-07-15 | 2020-10-09 | 桂林电子科技大学 | High-performance multimode double-broadband filter |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112909460A (en) * | 2021-01-18 | 2021-06-04 | 电子科技大学 | Balanced microstrip filter with common-mode and differential-mode signal reflection-free characteristics |
| CN112909460B (en) * | 2021-01-18 | 2022-04-19 | 电子科技大学 | Balanced microstrip filter with common-mode and differential-mode signal reflection-free characteristics |
| CN114843728A (en) * | 2022-04-06 | 2022-08-02 | 大连海事大学 | Balanced band-pass filter with input end having differential mode and common mode reflection-free characteristics |
| CN114843728B (en) * | 2022-04-06 | 2023-05-26 | 大连海事大学 | Balanced band-pass filter with input end having differential mode and common mode reflection-free characteristics |
| CN114725635A (en) * | 2022-05-06 | 2022-07-08 | 华东交通大学 | Double-frequency balance filter |
| CN114725635B (en) * | 2022-05-06 | 2024-01-30 | 华东交通大学 | Dual-frequency balance filter |
| CN115133280A (en) * | 2022-07-27 | 2022-09-30 | 重庆邮电大学 | Differential broadband filtering antenna |
| CN115133280B (en) * | 2022-07-27 | 2024-04-19 | 重庆邮电大学 | Differential broadband filtering antenna |
| CN116598738A (en) * | 2023-07-17 | 2023-08-15 | 成都华兴汇明科技有限公司 | Four-port frequency-selecting network and microwave oscillator constructed by same |
| CN116598738B (en) * | 2023-07-17 | 2023-10-13 | 成都华兴汇明科技有限公司 | Four-port frequency-selecting network and microwave oscillator constructed by same |
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