WO2010005017A1 - ストリップラインフィルタ - Google Patents
ストリップラインフィルタ Download PDFInfo
- Publication number
- WO2010005017A1 WO2010005017A1 PCT/JP2009/062420 JP2009062420W WO2010005017A1 WO 2010005017 A1 WO2010005017 A1 WO 2010005017A1 JP 2009062420 W JP2009062420 W JP 2009062420W WO 2010005017 A1 WO2010005017 A1 WO 2010005017A1
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- WIPO (PCT)
- Prior art keywords
- line
- input
- dielectric substrate
- filter
- stripline filter
- Prior art date
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Classifications
-
- 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
-
- 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
Definitions
- the present invention relates to a stripline filter having a dielectric substrate provided with a stripline.
- a filter used in a communication system such as UWB (ultra wide band) communication using a very wide band at a high frequency is required to have a wide band filter characteristic.
- the specific bandwidth of the filter depends on the strength of electromagnetic coupling between resonators and the strength of external coupling. Therefore, a strong external coupling is realized by directly connecting the resonant line and the input / output electrode constituting the resonator of the input / output stage with an electrode and performing a tap coupling, and each resonator is interdigitally coupled.
- a stripline filter having a broadband filter characteristic may be used (see, for example, Patent Document 1).
- FIG. 5 of Patent Document 1 the open ends and the short-circuit ends of the three-stage resonant line electrodes are alternately arranged and interdigitally coupled, and the input / output stage resonant line electrodes and the input / output electrodes are directly connected. A tap-coupled one is described.
- the specific bandwidth of the filter is affected by electromagnetic coupling between the resonators constituting the filter. Therefore, conventionally, when adjusting the specific bandwidth of the filter, the electromagnetic field coupling is adjusted by adjusting the arrangement interval of the resonators to set the specific bandwidth of the filter to a desired value. In this case, since the arrangement interval of the resonators becomes a setting variable for electromagnetic coupling, the outer dimension of the filter is restricted. As a result, there are cases in which the required size of the filter cannot be satisfied while the required specific bandwidth of the filter is realized.
- the specific bandwidth of the filter it is conceivable to set the specific bandwidth of the filter to a desired value by adjusting the strength of external coupling.
- the specific bandwidth of the filter is wide if the external coupling is strong, and the external coupling is strong if the characteristic impedance of the resonator in the input / output stage is high. For this reason, it is conceivable to adjust the characteristic impedance in order to satisfy the specific bandwidth condition.
- the adjustment of the characteristic impedance changes the filter characteristics such as pass characteristics and reflection characteristics, and the desired filter characteristics can be obtained. There was nothing. For example, even if the line width of each resonance line is narrowed and the characteristic impedance is increased, the resistance of the resonance line is increased and the insertion loss of the filter is increased, so that good pass characteristics cannot be obtained.
- an object of the present invention is to provide a stripline filter capable of strengthening external coupling while suppressing restrictions on external dimensions and deterioration of filter characteristics.
- the present invention is a stripline filter including a plurality of resonators of three or more stages including an input / output stage resonator and an intermediate stage resonator, and includes a ground electrode, an input / output electrode, an intermediate stage resonance line, and an input / output A stage resonant line and a connection electrode are provided.
- the ground electrode is provided only on the lower surface of the rectangular flat dielectric substrate.
- the input / output electrodes are provided on the lower surface of the dielectric substrate apart from the ground electrode.
- the intermediate stage resonance line is provided on the upper surface of the dielectric substrate, and constitutes an intermediate stage resonator.
- the input / output stage resonance line is provided on the upper surface of the electric substrate with a line width narrower than that of the intermediate stage resonance line, and constitutes an input / output stage resonator.
- the connection electrode conducts the input / output stage resonance line and the input / output electrode.
- the filter can be downsized.
- the characteristic impedance of the input / output stage resonant line becomes higher than when the line width of the input / output stage resonant line is equal to that of the intermediate stage resonant line.
- the resistance of the input / output stage resonance line increases and the insertion loss of the filter also increases.
- the influence of the line width on the insertion loss of the filter is stronger in the intermediate stage resonator and constitutes the intermediate stage resonator. Increasing the insertion loss of the filter is suppressed by increasing the line width of the line to be performed.
- the arrangement interval between the input / output stage resonance line and the resonance line adjacent to the input / output stage resonance line is wider than the arrangement interval between other resonance lines.
- the electromagnetic coupling between the resonator formed by the input / output stage resonance line and the adjacent resonator is weakened, and the filter is biased so that the specific bandwidth is narrowed. Therefore, it is possible to suppress the restriction on the outer dimensions of the filter while negating the influence of the broadening of the filter due to the strong external coupling. That is, in order to realize an arbitrary frequency characteristic such as a frequency characteristic similar to the conventional one, the design variable can be increased to increase the degree of design freedom.
- connection electrode includes an upper surface line portion provided on the upper surface of the dielectric substrate, and a side surface line portion provided on the side surface of the dielectric substrate so as to pass through the center of the side surface. It is preferable that it is narrower than the line width of the side line part.
- the electromagnetic field coupling between the resonators is large, and a broadband frequency characteristic suitable for UWB communication or the like can be obtained.
- the upper surface of the dielectric substrate may be opened, a laminated dielectric substrate may be laminated, or a laminated glass layer may be laminated.
- strong external coupling can be realized by narrowing the line width of the input stage resonant line while suppressing restrictions on the outer dimensions and suppressing deterioration of the filter characteristics.
- the stripline filter shown here is a band-pass filter. This filter is used for UWB (Ultra Wide Band) communication corresponding to a high frequency band of 4 GHz or more.
- UWB Ultra Wide Band
- FIG. 1 is an exploded perspective view of the upper surface side of the stripline filter.
- FIG. 2 is a perspective view of the lower surface side of the stripline filter.
- the stripline filter 1 includes a rectangular flat dielectric substrate 10 and laminated glass layers 2 and 3.
- each of the laminated glass layers 2 and 3 has a thickness of about 15 ⁇ m.
- the laminated glass layers 2 and 3 are laminated on the upper surface of the dielectric substrate 10 and contribute to mechanical protection of the stripline filter 1 and improvement of environmental resistance.
- the laminated glass layer 2 is provided with a hole 21 serving as a marker so that the direction of the stripline filter 1 can be visually recognized.
- the laminated glass layers 2 and 3 are not indispensable structures, and a structure in which the upper surface of the dielectric substrate 10 is opened without providing the laminated glass layers 2 and 3, or another dielectric substrate is provided on the upper surface of the dielectric substrate 10. It is good also as a structure which laminates
- the dielectric substrate 10 is a small rectangular parallelepiped ceramic sintered substrate made of titanium oxide or the like and having a relative dielectric constant of about 111, and the composition and dimensions of the substrate 10 are set in consideration of frequency characteristics and specifications.
- upper surface resonance lines 13A to 13E, upper surface line portions 16A and 16B, and connection electrode portions 15A and 15B are formed on the upper surface of the substrate 10.
- These electrode patterns are silver electrodes having a thickness of about 5 ⁇ m or more, and are formed by applying a photosensitive silver paste to the substrate 10, forming a pattern by a photolithography process, and baking. By making these electrodes photosensitive silver electrodes, the shape accuracy of the electrodes is increased to provide a stripline filter that can be used for UWB communication.
- side resonance lines 12A and 12B and dummy electrodes 11A and 11B are formed on the right-hand front surface (right side surface) of the substrate 10 in FIG.
- Side resonance lines 12C and 12D and dummy electrodes 11C and 11D are formed on the left-hand back surface (left side surface) opposite to the right-hand front surface (right side surface) of the substrate 10 as shown in FIG.
- These electrode patterns are silver electrodes having a thickness of about 12 ⁇ m or more, and are formed by applying a non-photosensitive silver paste to the substrate 10 using a screen mask or a metal mask and baking it.
- the electrode pattern on the right-hand front surface (right side surface) and the electrode pattern on the left-hand back surface (left side surface) of the substrate 10 are formed in a congruent shape, and the orientation of the substrate 10 is determined in these electrode pattern forming steps.
- the dummy electrodes 11A to 11D are not essential and need not be provided.
- the electrode thickness of the side electrode pattern thicker than the electrode thickness of the upper electrode pattern, the current at the grounded end side of the resonator where current concentration generally occurs is dispersed, and the conductor loss is reduced. Yes.
- a side track portion 14A is formed on the left-hand front surface (front surface) of the substrate 10 in FIG.
- a side track portion 14 ⁇ / b> B (not shown) is formed on the back surface (back surface) of the right hand facing the front surface (front surface) of the left hand of the substrate 10.
- These electrode patterns are silver electrodes having a thickness of about 12 ⁇ m or more, and are formed by applying a non-photosensitive silver paste to the substrate 10 using a screen mask or a metal mask and baking it. Note that the electrode pattern on the left-hand front surface (front surface) and the electrode pattern on the right-hand back surface (back surface) of the substrate 10 are formed so as to pass through the centers of the respective surfaces and be congruent with each other. Thus, it is not necessary to control the orientation of the substrate 10 in the process of forming these electrode patterns, and the mounting position is made appropriate by the self-alignment effect by the solder during the SMD mounting of the chip.
- the lower surface of the substrate 10 is a mounting surface of the stripline filter 1, and the ground electrode 17 and the input / output electrodes 18A and 18B are formed apart from each other.
- the input / output electrodes 18A and 18B are formed separately from the ground electrode 17.
- the input / output electrodes 18A and 18B are connected to a high-frequency signal input / output terminal when the stripline filter 1 is mounted on a mounting board.
- the ground electrode 17 is the ground plane of the resonator and is connected to the ground electrode of the mounting board.
- the bottom electrode pattern is a silver electrode having a thickness of about 12 ⁇ m, and is formed by applying a non-photosensitive silver paste to the substrate 10 using a screen mask or a metal mask and baking it.
- the input / output electrodes 18A and 18B are provided at positions in contact with the boundary between the left-hand front surface (front surface) or the right-hand back surface (back surface) and the lower surface. And, by making the width at the boundary thicker than the side line parts 14A and 14B, the connectivity with the side line parts 14A and 14B is enhanced, and the side line parts 14A and 14B and the ground electrode 17 are insulated. Increases sex.
- the upper surface resonance lines 13A and 13E are connected to the side surface resonance lines 12C and 12D at the boundary between the left hand back surface (left side surface) and the upper surface of the substrate 10, and the side surface resonance lines 12C and 12D are connected.
- the upper resonant lines 13A and 13E are extended from the boundary to the right-hand front surface (right side surface) side, and the tips are open.
- the upper surface resonance lines 13B and 13D are connected to the side resonance lines 12A and 12B at the boundary between the right-hand front surface (right side surface) and the upper surface of the substrate 10, and are connected to the ground electrode 17 on the lower surface via the side surface resonance lines 12A and 12B. Yes.
- the upper surface resonance lines 13B and 13D are bent from the boundary thereof and extend to the left-hand back surface (left side surface) side, and the tips are opened.
- the top resonant line 13C is a C-shaped electrode that is disposed in the center of the substrate 10 and that is open on the right-hand front (right side) side, and both ends thereof are open.
- These upper surface resonance lines 13A to 13E constitute a five-stage resonator that faces the ground electrode 17 on the lower surface and is interdigitally coupled to each other.
- the upper surface resonance line 13A constituting the first stage resonator and the upper surface resonance line 13E constituting the fifth stage resonator are the input / output stage resonance lines of the present invention and constitute the input / output stage resonators. To do.
- the upper surface resonance lines 13B to 13D constituting the second to fourth stage resonators are the intermediate stage resonance lines of the present invention, and constitute an intermediate stage resonator.
- the upper surface resonance lines 13A and 13E are connected to the input / output electrodes 18A and 18B through the upper surface line portions 16A and 16B, the connection electrode portions 15A and 15B, and the side surface line portions 14A and 14B.
- the upper surface line portions 16A and 16B are connected between the upper surface resonance lines 13A and 13E and the connection electrode portions 15A and 15B.
- the connection electrode portions 15A and 15B are formed on the upper surface end portion of the dielectric substrate 10, and are connected to the side surface line portions 14A and 14B and the upper surface line portions 16A and 16B.
- the side line portions 14A and 14B are connected to the input / output electrodes 18A and 18B.
- the upper surface line portions 16A and 16B, the connection electrode portions 15A and 15B, and the side surface line portions 14A and 14B constitute a tap electrode, and the resonator formed by the upper surface resonance lines 13A and 13E is directly connected to the input / output electrodes 18A and 18B. Connect and tap to join.
- the widths of the connection electrode portions 15A and 15B are made wider than the sum of the representative values of the electrode formation errors of the side surface line portions 14A and 14B and the line widths of the side surface line portions 14A and 14B. Accordingly, the side surface line portions 14A and 14B are reliably connected to the connection electrode portions 15A and 15B over the entire length.
- the line widths of the upper surface line portions 16A and 16B are narrower than those of the side surface line portions 14A and 14B and the connection electrode portions 15A and 15B, and the capacitance generated between the upper surface line portions 16A and 16B and the ground electrode 17.
- the outer coupling is strengthened by reducing the.
- the line widths of the top resonance lines 13A and 13E are narrower than the line widths of the top resonance lines 13B to 13D.
- the characteristic impedance of the upper surface resonance lines 13A and 13E is increased by narrowing the line width of the upper surface resonance lines 13A and 13E constituting the resonator at the input / output stage.
- the external Q: Q e of the filter is proportional to the reciprocal of the characteristic impedance of the input / output stage resonator, and the strength of the external coupling is proportional to the reciprocal of the external Q: Q e .
- FIG. 3 is a diagram showing calculation results of changes in external Q: Qe and changes in external coupling when the line widths of the top resonant lines 13A and 13E are changed.
- the line width of the top resonant lines 13B to 13D is 120 ⁇ m. From the calculation results, it can be confirmed that the external Q: Qe becomes smaller and the external coupling becomes stronger as the line width of each of the top resonant lines 13A and 13E is narrower.
- the specific bandwidth of the stripline filter 1 is affected not only by external coupling but also by the degree of electromagnetic coupling between the resonators.
- the arrangement interval between the upper surface resonance lines 13A and 13E and the upper surface resonance lines 13B and 13D is wide, and therefore the electromagnetic field coupling between the resonators is weak. Due to the weakening of the electromagnetic coupling, the specific bandwidth of the filter is biased to be narrow. Accordingly, the broadening of the band due to the enhancement of the external coupling is canceled by the decrease of the electromagnetic coupling, and the stripline filter 1 maintains the same specific bandwidth as the case where the line widths of the top resonance lines 13A to 13E are made uniform. Dimensional constraints are reduced.
- the resistance component of the top resonant line if Hosokere the line width of the top surface resonant line is large, the unloaded Q: Q 0 is reduced insertion loss of the filter increases. Therefore, even in this configuration, resulting in a bias associated to an increase in the insertion loss of the filter increases.
- the line width of the upper surface resonant lines 13B ⁇ 13D is thick, the unloaded Q: reduction of Q 0 is the top surface resonant lines 13A , 13E is suppressed only by an increase in resistance, and an increase in insertion loss is suppressed.
- the influence of the line width on the insertion loss of the filter is stronger at the center resonator and the input / output stage resonator is weaker. Therefore, by increasing the line width of the line constituting the intermediate stage resonator, the insertion loss of the filter is increased. The increase of is suppressed.
- FIG. 4 is a diagram for explaining the comparison between the filter characteristics in the present embodiment measured by simulation and the filter characteristics in the comparative example.
- FIG. 4A is a diagram for explaining a configuration example of a stripline filter in the present embodiment
- FIG. 4B is a diagram for explaining a configuration example of a comparison-target stripline filter.
- () Is a diagram showing filter characteristics of the stripline filters of the present configuration example and the comparative example. The solid line in the filter characteristics indicates this configuration example, and the dotted line indicates a comparative example.
- the line widths of the top resonance lines 13A and 13E are W1, and the line widths of the top resonance lines 13B to 13D are W2.
- the line width W1 is narrower than the line width W2.
- the upper surface resonance lines 13A and 13E and the upper surface resonance lines 13B and 13D are arranged at the arrangement interval L1.
- the line widths of the upper surface resonance lines 13A to 13E are uniform at W2. Further, the upper surface resonance lines 13A and 13E and the upper surface resonance lines 13B and 13D are arranged at an arrangement interval L1 '.
- the sum of the arrangement interval L1 'and the line width W2 in the comparative example is equal to the sum of the arrangement interval L1 and the line width W1 in this configuration example.
- the insertion loss in the 3 dB ratio bandwidth of the pass characteristic (S21) is almost unchanged.
- the line widths of the top surface resonance lines 13A and 13E in the input / output stage are narrowed, the line widths of the top surface resonance lines 13B to 13D are not changed, so that the insertion loss is almost increased. It is thought that there was not.
- there is a frequency where the insertion loss is partially increased in the comparative example but this is because the matching balance is changed as a result of changing the impedance matching in the configuration example to the configuration of the comparative example. It is considered that the insertion loss of the comparative example has increased due to the collapse.
- the present configuration example has a smaller amount of reflection and is better. This is probably because the matching balance is lost and the reflection amount of the comparative example is increased as a result of changing the impedance matching in the present configuration example to the configuration of the comparative example.
- FIG. 5 is a top view of the dielectric substrate of the stripline filter 51 of the present embodiment.
- the stripline filter 51 of the present embodiment is different in that the arrangement interval between the upper surface resonance line 13A (13E) and the upper surface resonance line 13B (13D) is equal to the arrangement interval L2 between the upper surface resonance lines 13B, 13C, and 13D. This is different from the stripline filter 1 of the first embodiment.
- the present invention by narrowing the line width of the upper-surface resonant line of the input / output stage, it is possible to strengthen external coupling while suppressing restrictions on the outer dimensions and deterioration of filter characteristics.
- the arrangement position and shape of the upper surface resonance line and the extraction electrode in the above-described embodiment are according to the product specification, and may be any arrangement position and shape according to the product specification.
- the present invention can be applied to configurations other than those described above, and can be applied to various filter pattern shapes.
- another configuration high frequency circuit may be further arranged in this filter.
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Abstract
Description
2,3…積層ガラス層
10…誘電体基板
11A~11D…ダミー電極
12A~12D…側面共振線路
13A~13E…上面共振線路
14A,14B…側面線路部
15A,15B…接続電極部
16A,16B…上面線路部
17…接地電極
18A,18B…入出力電極
21…孔
Claims (7)
- 入出力段の共振器と中間段の共振器とを含む3段以上の共振器を備えるストリップラインフィルタであって、
矩形平板状の誘電体基板の下面のみに設けられた接地電極と、
前記誘電体基板の下面に前記接地電極から離間して設けられた入出力電極と、
前記誘電体基板の上面に設けられ、前記中間段の共振器を構成する中間段共振線路と、
前記誘電体基板の上面に前記中間段共振線路よりも細い線路幅で設けられ、前記入出力段の共振器を構成する入出力段共振線路と、
前記入出力段共振線路と前記入出力電極とを導通する接続電極と、
を備える、ストリップラインフィルタ。 - 前記入出力段共振線路と、前記入出力段共振線路に隣接する共振線路との配置間隔を、他の共振線路間の配置間隔よりも広くした請求項1に記載のストリップラインフィルタ。
- 前記接続電極は、
前記誘電体基板の上面に設けられた上面線路部と、
前記誘電体基板の側面に側面中央を通過するように設けられた側面線路部と、を備え、
前記上面線路部の線路幅が、前記側面線路部の線路幅よりも細い、
請求項1または2に記載のストリップラインフィルタ。 - 前記3段以上の共振器は、互いにインターディジタル結合する、請求項1~3のいずれかに記載のストリップラインフィルタ。
- 前記誘電体基板の上面に積層される積層誘電体基板をさらに備え、前積層誘電体基板の上面にも接地電極を形成した請求項1~4のいずれかに記載のストリップラインフィルタ。
- 前記誘電体基板の上面を開放した、請求項1~4のいずれかに記載のストリップラインフィルタ。
- 前記誘電体基板の上面に積層される積層ガラス層をさらに備える、請求項1~4のいずれかに記載のストリップラインフィルタ。
Priority Applications (3)
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JP2010501315A JP5131344B2 (ja) | 2008-07-11 | 2009-07-08 | ストリップラインフィルタ |
CN200980100840A CN101842935A (zh) | 2008-07-11 | 2009-07-08 | 带状线滤波器 |
US12/752,433 US20100182104A1 (en) | 2008-07-11 | 2010-04-01 | Stripline filter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2008-180995 | 2008-07-11 | ||
JP2008180995 | 2008-07-11 |
Publications (1)
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WO2010005017A1 true WO2010005017A1 (ja) | 2010-01-14 |
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PCT/JP2009/062420 WO2010005017A1 (ja) | 2008-07-11 | 2009-07-08 | ストリップラインフィルタ |
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US (1) | US20100182104A1 (ja) |
JP (1) | JP5131344B2 (ja) |
CN (1) | CN101842935A (ja) |
WO (1) | WO2010005017A1 (ja) |
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US9325046B2 (en) * | 2012-10-25 | 2016-04-26 | Mesaplexx Pty Ltd | Multi-mode filter |
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WO2008038443A1 (fr) * | 2006-09-28 | 2008-04-03 | Murata Manufacturing Co., Ltd. | Filtre diélectrique, élément de circuit intégré et procédé de fabrication d'élément de circuit intégré |
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2009
- 2009-07-08 WO PCT/JP2009/062420 patent/WO2010005017A1/ja active Application Filing
- 2009-07-08 JP JP2010501315A patent/JP5131344B2/ja not_active Expired - Fee Related
- 2009-07-08 CN CN200980100840A patent/CN101842935A/zh active Pending
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2010
- 2010-04-01 US US12/752,433 patent/US20100182104A1/en not_active Abandoned
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WO2008093459A1 (ja) * | 2007-02-01 | 2008-08-07 | Murata Manufacturing Co., Ltd. | 共振素子および、その製造方法 |
WO2009078281A1 (ja) * | 2007-12-17 | 2009-06-25 | Murata Manufacturing Co., Ltd. | ストリップラインフィルタおよびその製造方法 |
JP2009200986A (ja) * | 2008-02-25 | 2009-09-03 | Murata Mfg Co Ltd | ストリップラインフィルタ |
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CN101842935A (zh) | 2010-09-22 |
JPWO2010005017A1 (ja) | 2012-01-05 |
JP5131344B2 (ja) | 2013-01-30 |
US20100182104A1 (en) | 2010-07-22 |
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