WO2021240918A1 - バンドパスフィルタ - Google Patents

バンドパスフィルタ Download PDF

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Publication number
WO2021240918A1
WO2021240918A1 PCT/JP2021/006396 JP2021006396W WO2021240918A1 WO 2021240918 A1 WO2021240918 A1 WO 2021240918A1 JP 2021006396 W JP2021006396 W JP 2021006396W WO 2021240918 A1 WO2021240918 A1 WO 2021240918A1
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WO
WIPO (PCT)
Prior art keywords
resonator
line
resonators
stage
filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/006396
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English (en)
French (fr)
Japanese (ja)
Inventor
雄大 長谷川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujikura Ltd
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Fujikura Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujikura Ltd filed Critical Fujikura Ltd
Priority to EP21814259.4A priority Critical patent/EP3996199B1/en
Priority to US17/633,004 priority patent/US11791522B2/en
Priority to CN202180004863.4A priority patent/CN114207935B/zh
Priority to JP2022527517A priority patent/JP7178527B2/ja
Publication of WO2021240918A1 publication Critical patent/WO2021240918A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20354—Non-comb or non-interdigital filters
    • H01P1/20381—Special shape resonators
    • 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
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • 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
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20354—Non-comb or non-interdigital filters
    • H01P1/20363—Linear resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/08—Strip line resonators
    • H01P7/082—Microstripline resonators

Definitions

  • the present invention relates to a bandpass filter.
  • a bandpass filter with a resonator, a first line, and a second line is illustrated.
  • Each of the n resonators is composed of a strip-shaped conductor bent in a rectangular shape so that the ends have gaps, and is arranged in 2 rows and n / 2 columns.
  • the first line is connected to the first stage resonator and the second line is coupled to the last stage resonator.
  • the first line and the second line are connected to the vicinity of the midpoint of the band-shaped conductor constituting each of the first stage resonator and the last stage resonator, respectively.
  • the first line and the second line function as lines for inputting and outputting high frequencies to the bandpass filter.
  • the bandpass filter configured in this way is an example of a microstrip filter.
  • the bandpass filter shown in 1 can also be transformed into a stripline filter.
  • the i-th resonator which is the i-th resonator (i is an integer of 1 or more and n-1 or less)
  • the i + 1-th resonator which is the i + 1th resonator
  • the first-stage resonator and the last-stage resonator are arranged so that the gap of the first-stage resonator and the gap of the final-stage resonator are close to each other.
  • the first line and the second line are connected to each other in the vicinity of the midpoint of the band-shaped conductor constituting the resonator. That is, the first line and the second line are each connected to the opposite side of the side where the gap is located. Therefore, Fig. In the bandpass filter illustrated in 1, the distance between the first line and the second line can be easily widened.
  • the first-stage resonator and the last-stage resonator are magnetically coupled to each other, and the second resonator, which is the second resonator, and the n-1th resonator are used.
  • a configuration is adopted in which the n-1th resonator is electrostatically coupled to the n-1th resonator.
  • FIG. 11 shows a filter 2010, which is a bandpass filter adopting such a configuration.
  • FIG. 11 is a perspective view of the filter 2010.
  • the filter 2010 is a stripline filter including a multilayer substrate 2011, a ground conductor layer 2012, 2013, six-stage resonators 2141 to 2146, and lines 2151, 1522.
  • the multilayer board 2011 is composed of two dielectric plate-shaped boards, a board 2111 and a board 2112.
  • the ground conductor layers 2012 and 2013 are provided on each of the pair of outer layers of the multilayer board 2011, respectively.
  • the resonators 2141 to 2146 and the lines 2151 and 1522 are provided in the inner layer of the multilayer board 2011.
  • the resonator 2141 is the first-stage resonator
  • the resonator 2146 is the final-stage resonator.
  • the line 2151 is the first line
  • the line 2152 is the second line.
  • the line 2151 is connected to the resonator 2141 and the line 2152 is connected to the resonator 2146.
  • the coupling between the resonator 2141 and the resonator 2142 and the coupling between the resonator 2145 and the resonator 2146 are required to be magnetic. That is, the resonator 2141 is required to be magnetically coupled to each of the resonator 2142 and the resonator 2146, and the resonator 2146 is required to be magnetically coupled to each of the resonator 2141 and the resonator 2145.
  • the side including the gap G1 among the four sides of the resonator 2141 and the side including the gap G6 among the four sides of the resonator 2146 are most separated from each other. It is preferable to be arranged. Therefore, the distance between the line 2151 and the line 2152 has to be narrowed.
  • the ground conductor layer 2012 is formed with a first anti-pad that surrounds a region that overlaps the first end portion in a plan view and a second anti-pad that surrounds a region that overlaps the second end portion in a plan view.
  • the area surrounded by each of the first antipad and the second antipad is the first land and the second land.
  • the first end portion and the first land are connected by the first via provided on the substrate 2111, and the second end portion and the second land are connected by the second via provided on the substrate 2111. It is a configuration that has been done.
  • the filter 2010 includes the first land, the second land, the first via, and the second via, the first land and the first via and the second land and the second via are combined. Because it is easy, the filter characteristics tend to deteriorate.
  • the present invention has been made in view of the above-mentioned problems, and an object thereof is to reduce deterioration of filter characteristics in a bandpass filter of a type called a stripline filter or a microstrip filter.
  • the bandpass filter there is at least one resonator layer and a plurality of resonators arranged in a layer separated from the ground conductor layer.
  • a plurality of resonators each composed of a band-shaped conductor, a first line which is a band-shaped conductor connected to a first-stage resonator among the plurality of resonators, and a resonance of the final stage of the plurality of resonators.
  • a second line, which is a band-shaped conductor connected to the vessel, is provided, and the first line is drawn out from the first-stage resonator and the second line is drawn out from the last-stage resonator.
  • a configuration is adopted in which the directions are opposite to each other.
  • the bandpass filter configured in this way is a type of bandpass filter called a stripline filter or a microstrip filter.
  • deterioration of filter characteristics can be reduced.
  • FIG. 3 is a plan view of a plurality of resonators provided in the first modification of the filter shown in FIG. 1. It is a top view of a plurality of resonators provided in the filter which concerns on 1st comparative example of this invention.
  • Each of (a) to (d) is a graph showing the S-parameters of the first comparative example, the first embodiment, the second comparative example, and the second embodiment, respectively.
  • Each of (a) to (d) includes a plurality of second modification, third modification, fourth modification, and fifth modification of the filter shown in FIG. 1, respectively. It is a top view of the resonator of. Each of (a) to (d) is a graph showing the S-parameters of the second modification, the third modification, the fourth modification, and the fifth modification, respectively.
  • (B) is a plan view of a plurality of resonators provided in the third modification shown in FIG. 7 (b).
  • Each of (a) and (c) is a plan view of a plurality of resonators provided in one modification of the third modification.
  • (E) is a plan view of a plurality of resonators provided in the fourth modification shown in FIG. 7 (c).
  • Each of (d) and (f) is a plan view of a plurality of resonators provided in one modification of the fourth modification.
  • Each of (a) to (f) is a graph showing the S-parameters of the filters shown in each of (a) to (f) of FIG. 9, respectively. It is a perspective view of the conventional bandpass filter.
  • FIG. 1 is a perspective view of the filter 10.
  • FIG. 2 is a cross-sectional view of the filter 10. Note that FIG. 2 shows a cross section along the central axis of the lines 151 and 152 included in the filter 10. Further, FIG. 2 shows the filter 10 in a state of being mounted on the mounting board 20.
  • FIG. 3 is a plan view of the resonators 141 to 146 and the lines 151 and 152 included in the filter 10. In FIG. 3, the substrate 112 and the ground conductor layer 13 included in the filter 10 are not shown.
  • the main surfaces of the substrate 111 and the substrate 112 are parallel to the xy plane, and the axis of symmetry AS of the filter 10 (see FIG. 3) is parallel to the x axis.
  • the Cartesian coordinate system is defined in. Further, the direction from the resonator 141 to the resonator 143 is defined as the x-axis positive direction, the direction from the resonator 146 to the resonator 141 is defined as the y-axis positive direction, and the direction from the substrate 111 to the substrate 112 is defined as the z-axis positive direction. It is set as the direction.
  • the filter 10 includes a multilayer board 11, a ground conductor layer 12, a ground conductor layer 13, resonators 141 to 146, lines 151, 152, vias 161, 162, and the like. It is provided with through vias 171 to 179, 1710.
  • the multilayer board 11 includes the boards 111 and 112 and an adhesive layer.
  • the illustration of the adhesive layer is omitted.
  • the boards 111 and 112 are two plate-shaped members made of a dielectric.
  • the substrate 112 is arranged on the upper side (the side in the positive direction of the z-axis) of the substrate 111.
  • the main surface opposite to the substrate 112 is referred to as an outer layer LO11
  • the main surface opposite to the substrate 111 is referred to as an outer layer LO12.
  • the area between the 111 and the substrate 112 is referred to as an inner layer LI1.
  • the substrates 111 and 112 are made of liquid crystal polymer resin.
  • the dielectric constituting the substrates 111 and 112 is not limited to the liquid crystal polymer resin, and may be a glass epoxy resin, an epoxy compounded product, a polyimide resin, or the like.
  • the substrates 111 and 112 have a rectangular shape in a plan view.
  • the shapes of the substrates 111 and 112 are not limited to the rectangular shape and can be appropriately selected.
  • the adhesive layer is provided on the inner layer LI1 and adheres the substrate 111 and the substrate 112 to each other.
  • the adhesive constituting the adhesive layer is not limited, and can be appropriately selected from existing adhesives.
  • the ground conductor layer 12 is composed of a conductor film provided on the outer layer LO11.
  • the ground conductor layer 13 is composed of a conductor film provided on the outer layer LO12.
  • the ground conductor layers 12 and 13 are examples of a pair of ground conductor layers facing each other, and form a strip line together with resonators 141 to 146 and lines 151 and 152, which will be described later.
  • the ground conductor layer 13 can be omitted from the ground conductor layer 12 and the ground conductor layer 13.
  • the substrate 112 can also be omitted.
  • the ground conductor layer 13 constitutes a microstrip line together with the resonators 141 to 146 and the lines 151 and 152 described later.
  • the ground conductor layers 12 and 13 are made of copper.
  • the conductors constituting the ground conductor layers 12 and 13 are not limited to copper, and may be gold, aluminum, or the like.
  • anti-pads 121 and 122 are formed on the ground conductor layer 12.
  • the anti-pad 121 is formed so as to surround a region of the end portion of the line 151 that overlaps with the end portion 1511 not connected to the resonator 141 in a plan view (see FIG. 3).
  • the anti-pad 122 is formed so as to surround a region of the end portion of the second line 152 that overlaps with the end portion 1521 that is not connected to the resonator 146 in a plan view (see FIG. 3).
  • each of the end portions 1511 and 1512 is an example of the first end portion and the second end portion, respectively.
  • the area surrounded by the anti-pad 121 will be referred to as a land 123, and the area surrounded by the anti-pad 122 will be referred to as a land 124.
  • Each of the anti-pad 121 and the anti-pad 122 is an example of the first anti-pad and the second anti-pad.
  • Each of the land 123 and the land 124 is an example of the first land and the second land, respectively.
  • the resonators 141 to 146 which are six-stage resonators, are an example of a plurality of resonators arranged in a layer separated from the ground conductor layer 12. Each of the resonators 141 to 146 is arranged in a state of being separated from each other so that the distance between the adjacent resonators is a predetermined distance.
  • the number of resonators (number of stages) is not limited to 6, and can be appropriately selected in order to realize desired reflection characteristics and transmission characteristics. However, the number of resonators is preferably an even number.
  • the filter 10 is a stripline filter
  • the resonators 141 to 146 are separated from each of the ground conductor layers 12 and 13, and the ground conductor layer 12 and the ground conductor layer 13 are separated from each other. It is provided so as to intervene between them.
  • the resonators 141 to 146 are provided in the inner layer LI1.
  • each of the resonators 141 to 146 is composed of a band-shaped conductor. As shown in FIG. 3, the resonators 141 to 146 bend each band-shaped conductor in the layer of the inner layer LI1 so that the pair of ends of the band-shaped conductors constituting the resonator form gaps G1 to G6. It is composed of things.
  • the resonators 141 to 146 are made of copper.
  • the band-shaped conductor constituting the resonators 141 to 146 is not limited to copper, and may be gold, aluminum, or the like.
  • Resonators 141 to 146 are arranged in 2 rows and 3 columns.
  • the resonator 141, the resonator 142, and the resonator 143 are examples of the first resonator, the second resonator, and the third resonator, respectively, and are arranged in rows 1 to 3 columns. ..
  • the resonator 144, the resonator 145, and the resonator 146 are examples of the fourth resonator, the fifth resonator, and the sixth resonator, respectively, and are arranged in 2 rows and 3 columns to 2 rows and 1 column. ..
  • a line 151 which will be described later, is connected to the resonator 141, and a line 152, which will be described later, is connected to the resonator 146. Therefore, the resonator 141 and the resonator 146 are examples of a first-stage resonator and a final-stage resonator, respectively.
  • the first-stage band-shaped conductor constituting the resonator 141 has a section S11 including an end portion E11, which is one end, and an end, which is the other end, at a bending point P11 near the midpoint of the band-shaped conductor. It is bent so as to be along the section S12 including the portion E12 (that is, to run in parallel).
  • the bending point P11 is an example of the first bending point.
  • the section S11 and the section S12 are examples of the first section and the second section, respectively.
  • the section closer to the resonator 146 is referred to as the section S12
  • the section farther from the resonator 146 is referred to as the section S11.
  • each of the sections S11 and S12 has the sub-sections S111 and S121 including the bending point P11 and the sub-sections S112 and S122 including the ends E11 and E12 at the bending point P12 near the midpoint of each.
  • the band-shaped conductors in the first stage are bent so that they are orthogonal to each other.
  • the sub-sections S111 and S121 are examples of the first sub-section, and the sub-sections S112 and S122 are examples of the second sub-section.
  • the band-shaped conductor in the final stage constituting the resonator 146 is a section S61 including an end portion E61, which is one end portion, at a bending point P61 near the midpoint of the band-shaped conductor, and the other end portion. It is bent so as to be along the section S62 including the end portion E62 (that is, to run in parallel).
  • the folding point P61 is an example of the second bending point.
  • the section S61 and the section S62 are examples of the first section and the second section, respectively. Of the sections S61 and S62, the section closer to the resonator 141 is referred to as the section S62, and the section far from the resonator 141 is referred to as the section S61.
  • the sub-sections S611 and S621 including the bending point P61 and the sub-sections S612 and S622 including the ends E61 and E62 are orthogonal to each other at the bending point P62 near the midpoint.
  • the strip-shaped conductor in the final stage is bent.
  • the sub-sections S611 and S621 are examples of the first sub-section, and the sub-sections S612 and S622 are examples of the second sub-section.
  • Each of the resonator 141 and the resonator 146 is arranged so that the first sub-sections run in parallel and the directions in which the second sub-sections are extended are opposite to each other. That is, in each of the resonator 141 and the resonator 146, the sub-section S111 and the sub-section S121, the sub-section S611 and the sub-section S621 run in parallel, and the sub-section S112 and the sub-section S122, the sub-section S612 and the sub-section S612 The sub-section S622 is arranged so that the extending directions are opposite to each other.
  • each of the sub-section S112 and the sub-section S122 is extended means the direction from the bending point P12 toward the ends E11 and E12, and in the present embodiment, it is the y-axis positive direction.
  • the direction in which each of the sub-section S612 and the sub-section S622 is extended means the direction from the bending point P62 toward the ends E61 and E62, and in the present embodiment, it is the y-axis negative direction.
  • the line 151 which will be described later, is connected to the resonator 141 at the connection point PC1 located near the bending point P11 of the sub-section S111 among the band-shaped conductors in the first stage constituting the resonator 141.
  • the line 152 which will be described later, is connected to the resonator 146 at the connection point PC6 located near the bending point P61 of the sub-section S611 among the band-shaped conductors in the final stage constituting the resonator 146.
  • each of the resonators 142 to 145 which are the resonators of the second to fifth stages, is configured by bending the band-shaped conductors constituting each of the resonators in the inner layer LI1. .. More specifically, in the resonators 142 to 145, each band-shaped conductor is bent so that the pair of ends of the band-shaped conductors constituting the resonator form gaps G2 to G5 and form a quadrangular shape. It is composed of. In the present embodiment, the shape of the resonators 142 to 145 is a square shape. In FIG.
  • the squares R2 to R5 corresponding to the central axis of the band-shaped conductor constituting each of the resonators 142 to 145 are illustrated by a two-dot chain line.
  • the shape of the resonators 142 to 145 is not limited to a square shape, and may be a rectangular shape. Further, the shapes of the resonators 142 to 145 may be the same or different.
  • the side including the gap G2 is referred to as the side R21, and the other three sides are, in order from the side R21 in the clockwise direction, the side R22, the side R23, and the side. It is referred to as side R24.
  • the sides including each of the gaps G3 to G5 are referred to as side R31, side R41, and side R51 for each of the resonators 143 to 145, and the other three sides are referred to as side R31, side R41, and so on.
  • side R31, side R41, and so on In the clockwise direction from the side R51, they are referred to as (1) side R32, side R42, side R52, (2) side R33, side R43, side R53, (3) side R34, side R44, and side R54. ..
  • the resonator 142 is arranged so that the gap G2 faces the direction close to the resonator 145 (that is, the y-axis negative direction).
  • the resonator 143 is arranged so that the gap G3 faces in a direction away from the resonator 144 (that is, in the positive y-axis direction).
  • the resonator 144 is arranged so that the gap G4 faces the direction away from the resonator 143 (that is, the negative y-axis direction).
  • the resonator 145 is arranged so that the gap G5 faces in a direction approaching the resonator 142 (that is, in the positive y-axis direction).
  • the resonators 141 to 146 have i as an integer of 1 or more and 5 or less, and have one side of the linear section of the i-th resonator and one side of the linear section of the i + 1 resonator. Are close to each other, and the gap G2 of the resonator 142 and the gap G5 of the resonator 145 are arranged so as to be close to each other.
  • the resonator 141 is arranged so that the sub-section S122 is close to the side R22 of the resonator 142, and the resonator 146 is arranged so that the sub-section S622 is close to the side R54 of the resonator 145. There is.
  • each resonator is often arranged so that the first-stage resonator and the last-stage resonator are electrostatically coupled.
  • the second-stage resonator and the fifth-stage resonator are configured.
  • the coupling with the resonator is an electrostatic coupling
  • the coupling between other resonators is a magnetic coupling.
  • One aspect of the present invention is Fig. Compared with the configuration like the bandpass filter described in 1, when a 6-stage elliptic function type bandpass filter is realized, the coupling that can occur between the pair of input / output ports described later is reduced, and its influence on the filter characteristics. Can be reduced.
  • the lines 151 and 152 are provided in the same layer as the resonators 141 to 146, that is, in the inner layer LI1.
  • the lines 151 and 152 are composed of linear strip-shaped conductors.
  • the lines 151 and 152 are composed of the same conductors as the resonators 141 to 146. Therefore, in this embodiment, the lines 151 and 152 are made of copper.
  • the conductors constituting the lines 151 and 152 are not limited to copper, and may be gold, aluminum, or the like.
  • the line 151 is an example of the first line
  • the line 152 is an example of the second line.
  • one end of the line 151 is connected to the resonator 141, and the line 151 is drawn out from the connection point PC1 in the positive y-axis direction.
  • one end of the line 152 is connected to the resonator 146 and is drawn out from the connection point PC6 in the negative direction of the y-axis. Therefore, the direction in which the line 151 is pulled out and the direction in which the line 152 is pulled out are parallel to each other and opposite to each other.
  • the vias 161, 162 which are examples of the first via and the second via, are tubular members made of a conductor provided on the substrate 111 among the two substrates 111, 112 constituting the multilayer substrate 11.
  • the vias 161, 162 may be columnar members made of conductors.
  • the via 161 is provided in a region where the land 123 provided on the ground conductor layer 12 and the end portion 1511 which is the other end of the line 151 overlap in a plan view, and short-circuits the land 123 and the end portion 1511. do.
  • the via 162 is provided in a region where the land 124 provided on the ground conductor layer 12 and the end portion 1521, which is the other end portion of the line 152, overlap, and short-circuits the land 124 and the end portion 1521.
  • the land 123 and the via 161 function as one of a pair of input / output ports in the filter 10.
  • the land 124 and the via 162 function as one of a pair of input / output ports in the filter 10.
  • the ten through vias 171 to 179, 1710 are cylindrical members made of conductors provided on the multilayer board 11 so as to penetrate the multilayer board 11. However, the through vias 171 to 179, 1710 may be columnar members made of conductors. Each of the through vias 171 to 179 and 1710 short-circuits the ground conductor layer 12 and the ground conductor layer 13.
  • the side RS1 when the substrate 111 is viewed in a plan view, of the four sides of the rectangular RS surrounding the resonators 141 to 146, the side close to the end portion 1511 of the line 151 is referred to as the side RS1 and is referred to as the side RS1.
  • the side close to the end portion 1521 is referred to as side RS2.
  • the side RS3 Of the two sides other than the sides RS1 and RS2, the side closer to the lines 151 and 152 (x-axis negative direction side) is referred to as the side RS3, and the side far from the lines 151 and 152 is referred to as the side RS4.
  • Each of the side RS1, the side RS2, and the side RS3 is an example of the first side, the second side, and the third side, respectively.
  • the through vias 171 to 179, 1710 are provided along the sides RS1 to RS4, which are the four sides of the rectangular RS, when the substrate 111 is viewed in a plan view.
  • these through vias may be provided at least in the vicinity of the end portion 1511 in the side RS1 and in the vicinity of the end portion 1521 in the side RS2, and are provided on three sides including the side RS1 and the side RS2. Is preferable.
  • these through vias are provided on three of the four sides RS1 to RS4 of the rectangular RS, it is preferable that the three sides are the side RS1, the side RS2, and the side RS3. A modified example of the arrangement of these through vias will be described later with reference to FIGS. 7 to 10.
  • the resonators 141 to 146, the line 151, and the line 152 are arranged so as to be axisymmetric with respect to the axis of symmetry AS.
  • the axis of symmetry AS is parallel to the direction (that is, the x-axis direction) orthogonal to the direction in which the line 151 and the line 152 extend (that is, the y-axis direction), and is located between the resonator 141 and the resonator 146.
  • the axis to do is parallel to the direction (that is, the x-axis direction) orthogonal to the direction in which the line 151 and the line 152 extend (that is, the y-axis direction), and is located between the resonator 141 and the resonator 146.
  • FIG. 2 shows the filter 10 mounted on the mounting board 20.
  • the mounting board 20 includes a multilayer board 21, a ground conductor layer 22, and a ground conductor layer 23.
  • the multilayer board 21 includes a board 211,212 and an adhesive layer.
  • the illustration of the adhesive layer is omitted.
  • the boards 211 and 212 are two plate-shaped members made of a dielectric.
  • the substrate 211 is the substrate on the side close to the filter 10, and the substrate 212 is arranged on the lower side (the side in the negative direction of the z-axis) of the substrate 211.
  • the main surface opposite to the substrate 212 is referred to as an outer layer LO21, and among the pair of main surfaces of the substrate 212, the main surface opposite to the substrate 211 is referred to as an outer layer LO22.
  • the area between the 211 and the substrate 212 is referred to as an inner layer LI2.
  • the adhesive layer is provided on the inner layer LI2 and adheres the substrate 211 and the substrate 212 to each other.
  • the ground conductor layer 22 is composed of a conductor film provided on the outer layer LO21.
  • the ground conductor layer 23 is composed of a conductor film provided on the outer layer LO22.
  • the ground conductor layers 22 and 23 form a strip line together with the lines 251,252 described later.
  • anti-pads 211 and 222 are formed on the ground conductor layer 22.
  • the area surrounded by the anti-pad 221 will be referred to as a land 223, and the area surrounded by the anti-pad 222 will be referred to as a land 224.
  • the center-to-center distance between the land 223 and the land 224 is equal to the center-to-center distance between the land 123 and the land 124.
  • the lines 251,252 are linear strip-shaped conductors provided in the inner layer LI2.
  • the track 251 is configured such that one end of the track 251 overlaps the land 223 in a plan view.
  • the track 252 is configured such that one end of the track 252 overlaps the land 224 in a plan view.
  • the lines 251,252 form a strip line together with the ground conductor layers 22 and 23.
  • the vias 261 and 262 are tubular members made of a conductor provided on the substrate 211 among the two substrates 211 and 212 constituting the multilayer substrate 21.
  • the vias 261,262 may be a columnar member made of a conductor.
  • the via 261 is provided in a region where the land 223 provided on the ground conductor layer 22 and one end of the line 251 overlap in a plan view, and short-circuits the land 223 and one end of the line 251. ..
  • the via 262 is provided in a region where the land 224 provided on the ground conductor layer 22 and one end of the line 252 overlap, and short-circuits the land 224 and one end of the line 252.
  • the land 223 and the via 261 function as one of a pair of input / output ports on the mounting board 20.
  • the land 224 and the via 262 function as one of a pair of input / output ports on the mounting board 20.
  • the filter 10 is mounted on the mounting substrate 20 by using solders 31, 32, 33.
  • the solder 31 conducts the land 123 and the land 223, and fixes the filter 10 to the mounting board 20.
  • the solder 32 conducts the land 124 and the land 224, and fixes the filter 10 to the mounting substrate 20.
  • the plurality of solders 33 short-circuit the ground conductor layer 12 and the ground conductor layer 22, and fix the filter 10 to the mounting substrate 20.
  • the filter 10 can be easily mounted on the mounting board 20 with low loss.
  • FIG. 4 is a plan view of a resonator 141A, a resonator 142A, a resonator 143, a resonator 144, a resonator 145A, and a resonator 146A, which are six-stage resonators included in the filter 10A.
  • the substrate 112 and the ground conductor layer 13 included in the filter 10A are not shown.
  • the filter 10A is obtained by replacing the resonators 141, 142, 145, 146 with the resonators 141A, 142A, 145A, 146A based on the filter 10. Therefore, in this modification, only the resonators 141A, 142A, 145A, and 146A will be described, and among the members of the filter 10A, the members common to the filter 10 are given the same member number, and the description thereof will be omitted.
  • the resonators 142A and 145A have a pair of ends in the band-shaped conductors constituting each of the resonators 142A and 145A so as to form gaps G2A and G5A and to have a quadrangular shape. , It is composed by bending each band-shaped conductor.
  • the shapes of the resonators 142A and 145A are rectangular in which the long side extends in the direction parallel to the y-axis direction.
  • the rectangles R2A and R5A corresponding to the central axes of the band-shaped conductors constituting the resonators 142A and 145A are shown by a two-dot chain line.
  • the side including the gap G2A is referred to as the side R21A, and the other three sides are in the clockwise direction from the side R21A, in order, the side R22A, the side R23A, and the side. It is referred to as side R24A.
  • the side including the gap G5A is referred to as the side R51A, and the other three sides are referred to as the side R54A, the side R53A, and the side R52A in the clockwise direction from the side R51A.
  • the resonator 142A is arranged so that the gap G2A faces the direction close to the resonator 145A (that is, the y-axis negative direction).
  • the resonator 145A is arranged so that the gap G5A faces the direction toward the resonator 142A (that is, the positive direction on the y-axis).
  • the sides R21A, R23A, R51A and R53A are the short sides, and the sides R22A, R24A, R52A and R54A are the long sides.
  • the filter 10A shortens the length of the region occupied by the resonators 141A, 142A, 143, 144, 145A, and 146A along the x-axis direction as compared with the filter 10, and brings the aspect ratio closer to 1: 1. Therefore, the bandpass filter according to one aspect of the present invention can be made compact.
  • the resonators 141 and 146 are replaced with the resonators 141A and 146A due to the adoption of the rectangular shape as the shape of the resonators 142A and 145A.
  • the resonators 141A and 146A extend the length of the subsections S122A and S622A as compared with the resonators 141 and 146. According to this configuration, even when the shape of the resonators 142A and 145A is rectangular, the coupling between the resonator 141A and the resonator 142A and the space between the resonator 145A and the resonator 146A The size of the bond in can be optimized.
  • the vias 161, 162 and the anti-pad 121 and the anti-pad 122 formed on the ground conductor layer 12 are omitted as the first embodiment, and the first embodiment is used.
  • the filter 10 according to the embodiment was used as the second embodiment.
  • the comparative examples for each of the first example and the second embodiment were designated as the first comparative example and the second comparative example, respectively.
  • the first comparative example in the filter 1010 shown in FIG. 5, the vias 1161 and 1162 and the antipad 1121 and the antipad 1122 formed on one of the ground conductor layers are omitted.
  • the second comparative example is the filter 1010 shown in FIG.
  • the substrate 1111, the antipad 1121, the antipad 1122, the land 1123, the land 1124, and the resonator 1141 ⁇ 1146, lines 1151, 1152, vias 1161, 1162, and through vias 1171 to 1177, respectively are a substrate 111, an anti pad 121, an anti pad 122, a land 123, a land 124, a resonator 141 to 146, and a line 151, respectively. , 152, vias 161, 162, and through vias 171 to 179, 1710.
  • the shape of the resonators 1141, 1146 is made square like the resonators 1142 to 1145, and the line 1151 is drawn out from the resonator 1141.
  • the direction and the direction in which the line 1152 is pulled out from the resonator 1146 are defined as the same direction (x-axis negative direction). Therefore, in the first comparative example and the second comparative example, the distance between the line 1151 and the line 1152 is larger than the distance between the line 151 and the line 152 as compared with the first embodiment and the second embodiment. Is also getting narrower.
  • the distance between the via 1161 and the land 1123 and the via 1162 and the land 1124 is larger than that of the via 161 and the land 123 and the via 162 and the land 124 as compared with the second embodiment. It is narrower than the interval (see FIG. 5).
  • the first embodiment, the second embodiment, the first comparative example, and the second comparative example 120 ⁇ m is adopted as the width of the strip-shaped conductor constituting each resonator, and the resonator is bent into a square shape.
  • About 1 mm was adopted as the length of one side of each resonator, and 100 ⁇ m was adopted as the diameter of the vias 161, 162, 1161, 1162.
  • the filter 10 when the filter 10 is actually used, the filter 10 is mounted on the mounting board 20. Therefore, the second embodiment and the second comparative example having lands and vias have a more realistic configuration, and the first embodiment and the first comparative example having no lands and vias are reference. It is a composition.
  • FIGS. 6A to 6D are graph showing S-parameters of the first comparative example, the first embodiment, the second comparative example, and the second embodiment, respectively. It should be noted that these S parameters are obtained by simulation.
  • the S-parameter S11 is plotted with a solid line, and the S-parameter S21 is shown with a broken line.
  • the frequency dependence of the S parameter S11 is referred to as a reflection characteristic
  • the frequency dependence of the S parameter S21 is referred to as a transmission characteristic.
  • the reflection characteristics and the transmission characteristics are collectively referred to as filter characteristics.
  • the second modification to the fifth modification which is a further modification of the filter 10A, which is the first modification shown in FIG. 4, will be described with reference to FIGS. 7 and 8.
  • the second modification will be referred to as a filter 10A1
  • the third modification will be referred to as a filter 10A2
  • the fourth modification will be referred to as a filter 10A3
  • the fifth modification will be referred to as a filter 10A4.
  • 7 (a) to 7 (d) are plan views of a plurality of resonators included in the filters 10A1 to 10A4.
  • the filter 10A4 is based on the filter 10A shown in FIG.
  • the filter 10A4 includes 12 through vias 171 to 179 and 1710 to 1712.
  • 8 (a) to 8 (d) are graphs showing the S-parameters of the filters 10A1 to 10A4. It should be noted that these S parameters are obtained by simulation.
  • the filters 10A1 to 10A3 are obtained by changing the number of sides on which a plurality of through vias are provided based on the filter 10A4. Therefore, in FIGS. 7A to 7D, a rectangular RS surrounding the plurality of resonators, sides RS1 to RS4 having four sides thereof, and a plurality of through vias (for example, through vias 171 in the case of the filter 10A4). ⁇ 179, 1710 ⁇ 1712) are designated only, and the codes of the other members are omitted.
  • through vias 171 to 179 and 1710 to 1712 are provided with through vias on all sides RS1 to RS4 of the rectangular RS.
  • the side RS1 is provided with through vias 171 to 173
  • the side RS2 is provided with 177 to 179
  • the side RS3 is provided with through vias 1710 to 1712
  • the side RS4 is provided with through vias 1710 to 1712.
  • Through vias 174 to 176 are provided.
  • the filter 10A1 is obtained by omitting the through vias 1710 to 1712 and the through vias 174 to 176 provided on each of the side RS3 and the side RS4 based on the filter 10A4.
  • the plurality of through vias are provided only on the side RS1 and the side RS2.
  • Each of the side RS1 and the side RS2 is an example of the first side and the second side, respectively.
  • the filter 10A2 is obtained by omitting the through vias 174 to 176 provided on the side RS4 based on the filter 10A4.
  • the plurality of through vias are provided on the side RS1, the side RS2, and the side RS3. Therefore, in the filter 10A2, the third side is the side RS3 which is the side closer to the first line and the second line.
  • the filter 10A3 is obtained by omitting the through vias 1710 to 1712 provided on the side RS3 based on the filter 10A4.
  • the plurality of through vias are provided on the side RS1, the side RS2, and the side RS4. Therefore, in the filter 10A3, the third side is the side RS4 which is the side far from the first line and the second line.
  • the filter 10A1 can suppress the S parameter S21 in the vicinity of 35 GHz by setting the sides provided with the plurality of through vias as the side RS1 and the side RS2. In the filter 10A, the peak that had occurred could be eliminated. However, when the filter 10A1 (see (a) in FIG. 8) and the filter 10A (see (d) in FIG. 8) are compared, the suppression of the S parameter S21 in the vicinity of 22.8 GHz in the cutoff band in the filter 10A1. Turned out to be worse.
  • the side provided with the plurality of through vias is defined as the side RS1, the side RS2, and the side RS3, or the side RS1, the side RS2, and the side RS4. It was found that 10A2 and 10A3 can suppress the S parameter S21 well at both the vicinity of 35 GHz and the vicinity of 22.8 GHz. When the filter 10A2 and the filter 10A3 were compared, it was found that the filter 10A2 could further suppress the S parameter S21 in the vicinity of 35 GHz.
  • FIG. 9A and 9B show a plan view of a plurality of resonators included in the filter 10A2 as (b), and a plan view of a plurality of resonators included in the filter 10A3 as (e). Moreover, each of (a) and (c) of FIG.
  • FIG. 9 is a plan view of a plurality of resonators included in the filter 10A2a and the filter 10A2b, which are modifications of the third modification, respectively. Further, each of FIGS. 9D and 9F is a plan view of a plurality of resonators included in the filter 10A3a and the filter 10A3b, which are modifications of the fourth modification, respectively.
  • Each of (a) to (f) of FIG. 10 is a graph showing the S parameter of the bandpass filter shown in each of (a) to (f) of FIG. 9, respectively.
  • FIGS. 9A and 9A in the filter 10A2a, two through vias 1710 and 1712 are provided on the side RS3, and in the filter 10A2b, five through vias 1710 to 1712 are provided on the side RS3. 1714 is provided. Further, as shown in FIGS. 9D and 9F, in the filter 10A3a, two through vias 174 and 176 are provided on the side RS4, and in the filter 10A3b, seven through vias are provided on the side RS4. 174 to 176, 1715 to 1718 are provided.
  • the bandpass filter there are a plurality of resonators arranged in at least one ground conductor layer and a layer separated from the ground conductor layer, each of which is composed of a band-shaped conductor.
  • the second line is provided, and the direction in which the first line is drawn out from the first-stage resonator and the direction in which the second line is drawn out from the last-stage resonator are mutually.
  • the configuration, which is in the opposite direction, is adopted.
  • the bandpass filter configured in this way is a type of bandpass filter called a stripline filter or a microstrip filter.
  • the end of the end of the first line that is not connected to the resonator of the first stage and the second line It is possible to keep away from the end of the end that is not connected to the resonator of the final stage. Therefore, a high frequency is input to the first line via the land and the via from the line formed in the layer different from the layer in which the plurality of resonators are arranged, and from the second line via the via and the land.
  • a high frequency is output to another line formed in a layer different from the layer in which the plurality of resonators are arranged, the coupling that can occur between one land and via and the other via and land is formed. Can be reduced. Therefore, it is possible to reduce the deterioration of the filter characteristics that may occur when such a configuration is adopted.
  • the band-shaped conductor of the first stage constituting the resonator of the first stage and the band-shaped conductor of the first stage are configured.
  • Each of the strip-shaped conductors of the final stage constituting the final stage resonator has a first section including one end and a first section including the other end at the first bending point near the middle point, respectively.
  • the first section and the second section are bent so as to be in line with the two sections, and each of the first section and the second section includes the first bending point at the second bending point near the middle point of each.
  • the 1st sub-section and the 2nd sub-section including the pair of ends are bent so as to be substantially orthogonal to each other, and each of the first-stage resonator and the final-stage resonator is parallel to each other.
  • the first line and the second line are arranged so that the directions in which the second sub-sections are extended are opposite to each other.
  • a configuration is adopted in which the section is connected in the vicinity of the first bending point of the section and in the vicinity of the first bending point of the first section of the strip-shaped conductor in the final stage.
  • each of the first line and the second line is in the vicinity of the first bending point of the first section of the band-shaped conductor in the first stage and in the first section of the band-shaped conductor in the final stage, respectively. 1 While connecting to the vicinity of the bending point, the direction in which the first line is drawn out from the first stage resonator and the direction in which the second line is drawn out from the last stage resonator are opposite to each other. Can be easily done.
  • the bandpass filter according to the third aspect of the present invention includes a plurality of plate-shaped members made of a dielectric in addition to the configuration of the bandpass filter according to the first aspect or the second aspect described above.
  • the multilayer substrate is further provided with the first via and the second via provided on the multilayer substrate, the at least one ground conductor layer is provided on the outer layer of the multilayer substrate, and the plurality of resonators are provided. , Which is provided in the inner layer of the multilayer substrate, and one of the at least one ground conductor layers is connected to the first-stage resonator at the end of the first line in a plan view.
  • the first anti-pad that surrounds the area that overlaps the first end, which is the end that is not short-circuited, and the second end that is not connected to the resonator in the final stage of the end of the second line in plan view.
  • a second anti-pad that surrounds the region that overlaps the end is formed, and the first via short-circuits the first land, which is the region surrounded by the first anti-pad, and the first end.
  • the second via has a configuration in which the second land, which is a region surrounded by the second anti-pad, and the second end portion are short-circuited.
  • this bandpass filter and another line can be easily connected.
  • the at least one ground conductor is described.
  • the layers are a pair of ground conductor layers facing each other, and the plurality of resonators are configured to be interposed between the pair of ground conductor layers.
  • the pair of ground conductor layers can shield the plurality of resonators from the outside.
  • the bandpass filter according to the fifth aspect of the present invention includes a plurality of plate-shaped members made of a dielectric in addition to the configuration of the bandpass filter according to the fourth aspect described above, and the pair.
  • the plurality of resonators are provided in the inner layer of the multilayer substrate, and the plurality of through vias are, in plan view, among the four sides of the rectangle surrounding the plurality of resonators, among the ends of the first line.
  • a configuration is adopted that is provided along three sides including a second side close to a certain second end.
  • this bandpass filter improves the transmission characteristics in the cutoff band as compared with the case where a plurality of through vias are provided only on the first side and the second side and the case where the plurality of through vias are provided on the four sides. Can be suppressed.
  • the third side constituting the three sides is the first side. Of the two sides other than the side and the second side, the side closer to the first line and the second line is adopted.
  • the transmission characteristic in the cutoff band on the high frequency side can be suppressed as compared with the case where the third side is the side far from the first line and the second line.
  • the plurality of resonators are used.
  • Each of which is composed of the band-shaped conductor bent so that a pair of ends have a gap, and is arranged in 2 rows and 3 columns, and is arranged in 1 row and 1 column to 1 row and 3 columns.
  • the resonators are the first resonator, the second resonator, and the third resonator, respectively, and the resonators arranged in rows 3 to 2 rows and 1 column are the fourth resonator, the fifth resonator, and the sixth resonator, respectively.
  • each of the first resonator and the sixth resonator is the first-stage resonator and the final-stage resonator, respectively, and the first resonator to the sixth resonator are i. Is an integer of 1 or more and 5 or less so that the linear section of the i-th resonator and the linear section of the i + 1 resonator are close to each other, and the gap of the second resonator and the gap of the fifth resonator are close to each other. Arranged, configuration is adopted.
  • the i-th resonator and the i + 1 resonator can be coupled mainly by magnetic coupling, and the second resonator and the fifth resonator can be coupled mainly by electrostatic coupling. Therefore, this bandpass filter can easily realize desired filter characteristics.
  • the plurality of resonators in addition to the configuration of the bandpass filter according to any one of the first to seventh aspects described above, the plurality of resonators.
  • the first line and the second line are arranged so as to be line-symmetrical.
  • the symmetry of the bandpass filter can be increased, so that the design parameters can be reduced. Therefore, the design of the bandpass filter can be facilitated as compared with the case where the plurality of resonators, the first line, and the second line are arranged so as not to be line-symmetrical.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Production Of Multi-Layered Print Wiring Board (AREA)
  • Filters And Equalizers (AREA)
PCT/JP2021/006396 2020-05-28 2021-02-19 バンドパスフィルタ Ceased WO2021240918A1 (ja)

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EP21814259.4A EP3996199B1 (en) 2020-05-28 2021-02-19 Bandpass filter
US17/633,004 US11791522B2 (en) 2020-05-28 2021-02-19 Bandpass filter
CN202180004863.4A CN114207935B (zh) 2020-05-28 2021-02-19 带通滤波器
JP2022527517A JP7178527B2 (ja) 2020-05-28 2021-02-19 バンドパスフィルタ

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EP3996199A4 (en) 2022-09-14
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