WO2006025179A1 - バンドパスフィルタ - Google Patents
バンドパスフィルタ Download PDFInfo
- Publication number
- WO2006025179A1 WO2006025179A1 PCT/JP2005/014278 JP2005014278W WO2006025179A1 WO 2006025179 A1 WO2006025179 A1 WO 2006025179A1 JP 2005014278 W JP2005014278 W JP 2005014278W WO 2006025179 A1 WO2006025179 A1 WO 2006025179A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pass filter
- inductor
- low
- capacitor
- filter
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1758—Series LC in shunt or branch path
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1766—Parallel LC in series path
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1775—Parallel LC in shunt or branch path
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H2001/0021—Constructional details
- H03H2001/0085—Multilayer, e.g. LTCC, HTCC, green sheets
Definitions
- the present invention relates to a bandpass filter, and more particularly to a bandpass filter used in a GHz band communication device or the like.
- this type of LC bandpass filter the one described in Patent Document 1 is known. As shown in FIG. 10, this band-pass filter is formed by connecting a third-order T-type high-pass filter 101 and a third-order ⁇ -type low-pass filter 102 directly in series at a connection point P31.
- the high-pass filter 101 includes capacitors C31 and C32 connected in series, one end of an inductor L32 connected between them, and the other end of the inductor L32 grounded via a capacitor C33.
- the low-pass filter 102 is obtained by grounding both ends of an inductor L35 and a capacitor C35 connected in parallel through capacitors C34 and C36, respectively.
- Patent Document 1 Japanese Patent Laid-Open No. 9-181549
- an object of the present invention is to easily perform impedance matching between a high-pass filter and a low-pass filter, improve the degree of freedom in designing each filter, and provide a wide band-pass filter with good characteristics. Is to provide.
- a bandpass filter includes a low-pass filter including a first inductor and a first capacitor, and includes a second inductor and a second capacitor.
- the low-pass filter, the high-pass filter, and the matching circuit are integrated in a multilayer block formed by laminating a plurality of dielectric layers.
- the low-pass filter has a fourth order or higher and the high-pass filter has a fourth order or higher.
- the matching circuit may be composed of a parallel resonant circuit including a third inductor and a third capacitor, or may be composed of only a third inductor or a third capacitor.
- the first inductor of the low-pass filter is formed in the first region of the multilayer block, and the second inductor of the high-pass filter is different from the first region in plan view from the stacking direction. I prefer to be formed.
- the second inductor of the high pass filter may be connected to the ground terminal formed on the surface of the multilayer block in the same plane.
- one inductor may be formed of a meandering stripline electrode, and the other inductor may be formed of a coiled stripline electrode. ,.
- the matching circuit since the matching circuit is provided between the low-pass filter and the high-pass filter, the matching circuit allows the low-pass filter and the high-pass filter to Impedance matching can be achieved, reflection characteristics (return loss) are improved, and identification as a bandpass filter is improved.
- the degree of freedom in designing the low-pass filter and the high-pass filter itself is increased, and desired characteristics can be designed in a wider band. .
- a compact and space-efficient band-pass filter can be obtained by integrating a low-pass filter, a high-pass filter, and a matching circuit in a multilayer block formed by laminating a plurality of dielectric layers. Can do. Also, by configuring the low-pass filter with the fourth order or higher and the high-pass filter with the fourth order or higher, it is possible to obtain a wide-band low-pass filter and a high-pass filter, thereby achieving a wide band filter of the band-pass filter. .
- the attenuation pole can be adjusted in consideration of the impedance matching action, and a wide-band and high-attenuation bandpass can be obtained.
- a filter can be obtained.
- the matching circuit is composed only of inductors, it is equivalent to a low-pass filter, and therefore high attenuation characteristics can be obtained in the high frequency region.
- the matching circuit is composed only of capacitors, it is equivalent to a high-pass filter, so high attenuation characteristics can be obtained in the low frequency range.
- the first inductor of the low-pass filter is formed in the first region of the multilayer block, and the second inductor of the high-loss filter is formed in the second region different from the first region in plan view, The coupling of the first and second inductors can be prevented, and the characteristics of the low-pass filter and high-pass filter can be improved.
- one inductor is formed by a meander-shaped stripline electrode, and the other inductor is formed by an S-coiled stripline electrode.
- the direction of the magnetic field in each inductor can be avoided as much as possible, transmission signal leakage between the high-pass filter and the low-pass filter is reduced, and the attenuation characteristics of the high-pass filter and the low-pass filter are reduced. Can be maintained, and a bandpass filter having good pass characteristics can be obtained.
- FIG. 1 is an equivalent circuit diagram of a bandpass filter according to a first embodiment of the present invention.
- FIG. 2 is an equivalent circuit diagram of a bandpass filter according to a second embodiment of the present invention.
- FIG. 3 is an equivalent circuit diagram of a bandpass filter according to a third embodiment of the present invention.
- FIG. 4 is an equivalent circuit diagram of a bandpass filter according to a fourth embodiment of the present invention.
- FIG. 5 is a graph showing attenuation characteristics of a low-pass filter and a high-pass filter in the first to fourth embodiments.
- FIG. 6 is a graph showing attenuation characteristics of the bandpass filter according to the first embodiment.
- FIG. 7 is a graph showing attenuation characteristics of a bandpass filter as a comparative example.
- FIG. 8 shows an appearance of a bandpass filter according to the fourth embodiment, wherein (A) is a front perspective view and (B) is a rear perspective view.
- FIG. 9 is an exploded perspective view showing an internal configuration of a multilayer block of a bandpass filter according to the fourth embodiment.
- FIG. 10 is an equivalent circuit diagram showing an example of a conventional bandpass filter.
- a bandpass filter 1 A includes a matching circuit 4 A for impedance matching between a fifth-order low-pass filter 2 and a fifth-order high-pass filter 3. It is provided.
- the low-pass filter 2 is connected in series with a parallel resonant circuit composed of an inductor L1 and a capacitor C2 connected in parallel, and an inductor L2 and a capacitor C4, and connected to one end connection point P1, an intermediate connection point P2, and the other end.
- Point P3 is grounded via capacitors CI, C3, and C5, respectively.
- the high-pass filter 3 includes capacitors C6, C8, and C10 connected in series, and each intermediate connection point P1
- the matching circuit 4A has one end of a parallel resonant circuit composed of an inductor L5 and a capacitor C11 connected to the connection point P21 between the low-pass filter 2 and the high-pass filter 3 and the other end grounded.
- the bandpass filter 1 B As shown in FIG. 2, the bandpass filter 1 B according to the second embodiment is provided with a matching circuit 4 B for impedance matching between the fifth-order low-pass filter 2 and the fifth-order high-pass filter 3. It is a thing.
- the low-pass filter 2 and the high-pass filter 3 have the same configuration force as in the first embodiment.
- matching circuit 4B a parallel resonant circuit composed of inductor L5 and capacitor CI1 is inserted between node P3 of low-pass filter 2 and one end of capacitor C6 of high-pass filter 3.
- the bandpass filter 1C according to the third embodiment is provided with a matching circuit 4C for impedance matching between the fifth-order low-pass filter 2 and the fifth-order high-pass filter 3. It is a thing.
- the low-pass filter 2 and the high-pass filter 3 have the same configuration force as that of the first embodiment.
- inductor L5 is inserted between node P3 of low-pass filter 2 and one end of capacitor C6 of high-pass filter 3.
- the bandpass filter 1D has a fifth-order low-pass filter.
- a matching circuit 4D for impedance matching is provided between the filter 2 and the fifth-order high-pass filter 3.
- the low-pass filter 2 and the high-pass filter 3 have the same configuration force as that of the first embodiment.
- a capacitor CI 1 is inserted between a connection point P3 of the low-pass filter 2 and one end of the capacitor C6 of the high-pass filter 3.
- FIG. 5A shows the attenuation characteristics of only the low-pass filter 2 in the first to fourth embodiments
- FIG. 5B shows the attenuation characteristics of only the high-pass filter 3.
- the curve S11 shows the reflection characteristic (return loss)
- the curve S21 shows the transmission characteristic.
- FIG. 6 shows the attenuation characteristics of the bandpass filter 1A according to the first embodiment shown in FIG. 1.
- FIG. 7 shows the attenuation characteristics when the low-pass filter 2 and the high-pass filter 3 are directly connected for comparison. Indicates.
- curve S11 shows the reflection characteristic (return loss)
- curve S21 shows the transmission characteristic. Comparing Fig. 6 (invention example) and Fig. 7 (comparative example), it can be seen that Fig. 6 shows a better attenuation characteristic in a wider band.
- the matching circuit 4A is provided between the low-pass filter 2 and the high-pass filter 3, impedance matching between the low-pass filter 2 and the high-pass filter 3 is obtained by the matching circuit 4A. Therefore, the reflection characteristics (return loss) are improved, and the characteristics as a bandpass filter are improved. In addition, the degree of freedom in designing the low-pass filter 2 and the high-pass filter 3 is increased, and desired characteristics can be designed in a wider band. Therefore, it is easy to improve loss, increase the bandwidth, control the attenuation pole, and control the center frequency.
- the wide-band low-pass filter 2 and the noise pass filter 3 can be obtained. Can be obtained.
- the matching circuit 4A by configuring the matching circuit 4A with a parallel resonant circuit including the inductor L5 and the capacitor CI1, it is possible to adjust the attenuation pole in consideration of the impedance matching action, and it is possible to adjust the broadband and high attenuation.
- a bandpass filter can be obtained.
- the bandpass filter 1B according to the second embodiment shown in FIG. 2 is also different from the first embodiment. The same effect is obtained.
- the bandpass filter 1C according to the third embodiment shown in FIG. 3 also has basically the same operational effects as the first embodiment.
- the matching circuit 4C is composed of only the inductor L5, it is equivalent to the low-pass filter 2, and high attenuation characteristics can be obtained in the high frequency region.
- the bandpass filter 1D according to the fourth embodiment shown in FIG. 4 basically exhibits the same operational effects as the first embodiment.
- the matching circuit 4D is composed of only the capacitor C11, it is equivalent to the high-pass filter 3, and a high attenuation characteristic can be obtained in the low frequency region.
- the laminate block 20 is obtained by laminating dielectric layers 21a to 21m made of a plurality of dielectric ceramic sheets.
- the capacitor electrode, stripline electrode, and via hole described below are screen-printed using a conductive paste on a ceramic green sheet obtained by forming a dielectric ceramic slurry using a doctor blade method or a pulling method. It is formed by a technique such as lamination, pressure bonding, and sintering.
- input and output terminals 25 and 26 for external connection are formed on the surface of the laminated laminate block 20 so as to extend from the center of both end surfaces to the upper and lower surfaces.
- Ground terminals 27 and 28 for external connection are formed extending from both side surfaces to the upper and lower surfaces.
- the terminals and electrodes formed on the dielectric layers 21a to 21m will be described in order.
- the dielectric layer 21a has input / output terminals 25 and 26 for external connection and ground terminals 27 and 28 for external connection. It is made.
- Inductors L3 and L4 are formed on the dielectric layers 21b and 21c by stripline electrodes 31, 33 and 32 and 34, and are connected by via holes 61 and 62, respectively.
- inductors LI and L2 are formed on the dielectric layer 21d by stripline electrodes 35 and 36 connected in series with each other.
- capacitor electrodes 41 to 57 are formed on the dielectric layers 21e to 21m, respectively.
- the capacitance of capacitor C1 of low-pass filter 2 is formed between electrodes 55 and 57
- the capacitance of the capacitor C2 is formed between the electrodes 52-53
- the capacitance of the capacitor C3 is formed between the electrodes 52-57.
- the capacitance of the capacitor C4 is formed between the electrodes 52 and 54
- the capacitance of the capacitor C5 is formed between the electrodes 56 and 57.
- the capacitance of the capacitor C11 of the matching circuit 4D is formed between the electrodes 43, 48-46.
- the capacitance of the capacitor C6 of the non-pass filter 3 is formed between the electrodes 46-44 and 49, and the capacitance of the capacitor C7 is formed between the electrodes 41-44.
- the capacitance of the capacitor C8 is formed between the electrodes 49 51-50, the capacitance of the capacitor C9 is formed between the electrodes 42-45, and the capacitance of the capacitor C10 is formed between the electrodes 47-45, 50.
- the capacitor C 1 is connected to the input / output terminal 25 through the electrode 55 and grounded through the electrode 57. That is, the electrode 57 is not only a capacitor electrode but also a ground electrode.
- Capacitor C 2 is connected to input / output terminal 25 at electrode 53 and connected to connection point P2 (via hole 68) of strip line electrodes 35 and 36 of inductor LI and L2 via electrode 52 ⁇ iron via holes 63 to 68 Has been. The other end of the stripline electrode 35 is connected to the input / output terminal 25.
- the capacitor C3 is connected to the connection point P2 through the via hole 63 to 68 at the electrode 52 and grounded at the electrode 57.
- the capacitor C4 is connected to the connection point P2 via the via hole 63 to 68 at the electrode 52, and connected to the connection point P3 via the via hole 70, 71, the electrode 58, and the via holes 72 to 76 at the electrode 54. Yes.
- the capacitor C5 is grounded by the electrode 57, and is connected to the connection point P3 by the electrode 56 through the via holes 69 to 72 and the like.
- the capacitor C11 is connected to the connection point P3 (via hole 76) via the via hole 75 at the electrode 43, and the electrode 46 is shared with the capacitor C6.
- Capacitor C6 has electrode 46 shared with capacitor C11 and electrode 44 shared with capacitor C7.
- the electrode 44 is shared with the capacitor C6, and the electrode 41 is connected to the stripline electrode 33 of the inductor L3 via the via holes 77 and 78.
- Capacitor C9 has electrode 45 shared with capacitors C8 and C9, and is connected to electrode 42 via via holes 81 and 82. Connected to stripline electrode 34 of Dactor L4. Capacitor C10 has electrode 45 shared with capacitors C8 and C9, and is connected to input / output terminal 26 at electrode 47.
- the stripline electrodes 35 and 36 forming the inductors L1 and L2 of the low-pass filter 2 and the stripline electrodes 31 and 33 forming the inductors L3 and L4 of the high-pass filter 3 are used.
- 32 and 34 are formed in different regions in plan view.
- the electrode 57 dropped to the ground in a plan view from the stacking direction is formed so as not to overlap the electrodes 31, 33, 32, and 34 of the high-pass filter 3, Without the stray capacitance force generated between the electrodes 31, 33, 32, and 34 and the electrode 57, the Inosnofinoleta 3 can maintain the broadband characteristics.
- the ends of the electrodes 31, 32 are connected to the ground terminal 28 in the same plane, the generation of stray capacitance with the ground terminal 28 is suppressed, and the high-pass filter 3 maintains the wideband characteristics. it can.
- the electrodes 35 and 36 of the low-pass filter 2 are formed by meander-shaped strip lines, and the electrodes 31, 33, 32, and 34 of the high-pass filter 3 are formed by coil-shaped strip lines. Therefore, it is possible to avoid the difference in the direction of the magnetic field in each inductor as much as possible, the transmission signal leakage between the high-pass filter 3 and the low-pass filter 2 is reduced, and the attenuation of the no-pass filter 3 and the low-pass filter 2 is reduced. Each characteristic can be maintained, and a bandpass filter with good pass characteristics can be obtained.
- the inductor of the low-pass filter 2 may be coiled and the inductor of the high-pass filter 3 may be meandered! /
- first to third embodiments are also configured as a dielectric block 20 that is basically the same as that shown in FIGS.
- the bandpass filter according to the present invention can be variously modified within the scope of the gist of the present invention, not limited to the above embodiment.
- both the low-pass filter and the noise-pass filter may be a force exemplified by a fifth-order filter, and both may be fourth-order filters.
- one filter power order and the other filter may be composed of filters of different orders, such as a fourth order.
- the detailed circuit configuration of the low-pass filter and the high-pass filter is arbitrary, and the configurations and shapes of the various electrodes formed in the laminated body block in each of the first to fourth embodiments are also arbitrary.
- the force of placing the no-pass filter on the upper stage and the low-pass filter on the lower stage may be reversed.
- the present invention is useful for bandpass filters used in GHz band communication devices and the like, and is particularly excellent in that impedance matching between a highpass filter and a lowpass filter can be easily obtained.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-254501 | 2004-09-01 | ||
JP2004254501 | 2004-09-01 |
Publications (1)
Publication Number | Publication Date |
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WO2006025179A1 true WO2006025179A1 (ja) | 2006-03-09 |
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PCT/JP2005/014278 WO2006025179A1 (ja) | 2004-09-01 | 2005-08-04 | バンドパスフィルタ |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008167157A (ja) * | 2006-12-28 | 2008-07-17 | Toko Inc | ハイパスフィルタ |
JP2016092525A (ja) * | 2014-10-31 | 2016-05-23 | 日本電信電話株式会社 | 帯域通過フィルタ及び合分波器 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06302471A (ja) * | 1993-04-15 | 1994-10-28 | Tokin Corp | バンドパスフィルタ |
JPH07202616A (ja) * | 1993-12-28 | 1995-08-04 | Kyocera Corp | 分布定数型ノイズフィルタ |
JPH0832393A (ja) * | 1994-07-14 | 1996-02-02 | Casio Comput Co Ltd | フィルタ回路 |
JPH08107326A (ja) * | 1994-10-04 | 1996-04-23 | Nippon Antenna Co Ltd | 混合器および分波器 |
JPH09135140A (ja) * | 1995-11-10 | 1997-05-20 | Tdk Corp | 複合回路部品 |
JPH09181549A (ja) * | 1995-12-22 | 1997-07-11 | Toko Inc | 積層lcバンドパスフィルタ |
JP2002217059A (ja) * | 2001-01-12 | 2002-08-02 | Murata Mfg Co Ltd | 積層型lcフィルタ |
JP2003115736A (ja) * | 2001-10-05 | 2003-04-18 | Murata Mfg Co Ltd | 3分波・合波器 |
JP2003273687A (ja) * | 2002-03-18 | 2003-09-26 | Hitachi Metals Ltd | ハイパスフィルタおよびこれを用いたマルチバンドアンテナスイッチ回路、マルチバンドアンテナスイッチ積層モジュール並びに通信装置 |
-
2005
- 2005-08-04 WO PCT/JP2005/014278 patent/WO2006025179A1/ja not_active Application Discontinuation
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06302471A (ja) * | 1993-04-15 | 1994-10-28 | Tokin Corp | バンドパスフィルタ |
JPH07202616A (ja) * | 1993-12-28 | 1995-08-04 | Kyocera Corp | 分布定数型ノイズフィルタ |
JPH0832393A (ja) * | 1994-07-14 | 1996-02-02 | Casio Comput Co Ltd | フィルタ回路 |
JPH08107326A (ja) * | 1994-10-04 | 1996-04-23 | Nippon Antenna Co Ltd | 混合器および分波器 |
JPH09135140A (ja) * | 1995-11-10 | 1997-05-20 | Tdk Corp | 複合回路部品 |
JPH09181549A (ja) * | 1995-12-22 | 1997-07-11 | Toko Inc | 積層lcバンドパスフィルタ |
JP2002217059A (ja) * | 2001-01-12 | 2002-08-02 | Murata Mfg Co Ltd | 積層型lcフィルタ |
JP2003115736A (ja) * | 2001-10-05 | 2003-04-18 | Murata Mfg Co Ltd | 3分波・合波器 |
JP2003273687A (ja) * | 2002-03-18 | 2003-09-26 | Hitachi Metals Ltd | ハイパスフィルタおよびこれを用いたマルチバンドアンテナスイッチ回路、マルチバンドアンテナスイッチ積層モジュール並びに通信装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008167157A (ja) * | 2006-12-28 | 2008-07-17 | Toko Inc | ハイパスフィルタ |
JP2016092525A (ja) * | 2014-10-31 | 2016-05-23 | 日本電信電話株式会社 | 帯域通過フィルタ及び合分波器 |
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