WO2005067095A1 - 同軸線路−平面基板変換構造と高周波用信号変換器 - Google Patents
同軸線路−平面基板変換構造と高周波用信号変換器 Download PDFInfo
- Publication number
- WO2005067095A1 WO2005067095A1 PCT/JP2004/019170 JP2004019170W WO2005067095A1 WO 2005067095 A1 WO2005067095 A1 WO 2005067095A1 JP 2004019170 W JP2004019170 W JP 2004019170W WO 2005067095 A1 WO2005067095 A1 WO 2005067095A1
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- WO
- WIPO (PCT)
- Prior art keywords
- coaxial line
- conductor
- conversion structure
- line
- plane substrate
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/085—Coaxial-line/strip-line transitions
Definitions
- the present invention relates to a coaxial line-to-plane substrate conversion structure for converting a high-frequency electrical signal between a coaxial line and a plane substrate line, and more particularly to a coaxial line-to-plane substrate conversion structure having less reflection over a wide band and a high-frequency signal.
- a converter Related to a converter.
- coaxial line type connectors have been widely used as a form of input and output of high-frequency signals of such high-frequency modules.
- This coaxial line is widely used because it has many advantages such as easy interconnection between coaxial line connectors and excellent high-frequency characteristics.
- the coaxial line type high-frequency line is difficult to handle inside the high-frequency module. For this reason, signal lines are exposed on the surface, such as microstrip lines or coplanar circuits, and flat substrate lines suitable for mounting are used.
- a coaxial line connector is used as an input / output interface of the module, and a flat substrate line is used inside the module. Signal conversion was required.
- many coaxial connectors that are excellent in miniaturization have been used, and many high-frequency packages employing a structure have been put into practical use. Even in such high-frequency modules, it is more convenient to convert them to coaxial lines during work such as evaluation and sorting, so special tools have been used to convert them to coaxial lines. .
- a coaxial strip conductor modification disclosed in Patent Document 1 is disclosed.
- a high-frequency coaxial connector in which an insulating portion and a core wire are inserted by fitting into a fitting portion recess formed in a metal case, and a ceramic in which a lower surface is in contact with the metal case and a strip conductor is provided on the upper surface.
- the air conditioner includes a separated portion formed between the insulating portion and the strip conductor, and a second cylindrical air gap formed between the core wire and the metal case at the separated portion.
- the second air gap is formed by cutting off the upper part of the cylindrical shape with a plane parallel to the center axis of the core wire, the center axis of the core wire and the center axis of the second air gap are aligned, and the upper surface of the core wire is formed. And the upper surface of the strip conductor are on the same plane.
- Patent Document 1 JP-A-2002-198129 (FIG. 1)
- the conversion of a coaxial line to a microstrip line as a conversion structure of a coaxial line-to-plane substrate line has the following problems in high-frequency characteristics.
- the microstrip line has a structure in which a dielectric is sandwiched between a strip conductor on the front surface and a ground on the back surface.
- ordinary high-frequency ICs often have all pads on the surface that input and output signals such as ground and data and power. In such a case, if the backside ground of the microstrip line is directly bonded to the surface ground of the IC by gold wire, the gold wire connecting them is long. For this reason, the inductance of the gold wire increases, and the characteristics deteriorate particularly in a high-frequency region.
- the coplanar circuit conversion structure with a conductor on the back side of the coaxial line shown in Fig. 1A and Fig. IB is used.
- an electric field distribution 520 that propagates in the air as shown in FIG. 3B for comparison in Example 1 described later occurs.
- the characteristic impedance In a normal high-frequency line, it is common to make the characteristic impedance to be 50 ⁇ .
- the electric field distribution 520 propagating in the air from the core wire 514 of the coaxial line to the surface ground 501 of the coplanar circuit 500 is large, so that the characteristic impedance is considerably lower than 50 ⁇ . As a result, reflection occurs due to discontinuity of the characteristic impedance in the electric signal converter.
- the coaxial strip conductor modification disclosed in Patent Document 1 as a method of suppressing reflection at these converters and performing broadband processing also has some practical problems.
- the core of the high-frequency coaxial line and the conductor of the strip substrate must be at the same height, and the distance between the core of the coaxial line and the strip conductor must be reduced to suppress the deterioration of high-frequency characteristics. Therefore, the processing tolerance of the metal case cannot be made very large.
- the core wire of the high-frequency coaxial line and the strip conductor on the ceramic substrate are fixed by ribbon bonding.
- such a coaxial strip conductor conversion unit is located near the inner wall of a metal case as shown in FIGS. For this reason, there are problems such as the need to use a special bonding device having poor workability with a normal ribbon bonding device.
- An object of the present invention is to provide a coaxial line conversion line substrate conversion structure using a coplanar circuit with a backside conductor, which is excellent in high frequency characteristics and does not require a special manufacturing process or device, and a conversion structure thereof.
- An object of the present invention is to provide a high-frequency signal converter.
- the coaxial line-to-plane substrate line conversion structure of the present invention is a coaxial line-to-plane substrate line conversion structure for high-frequency signal conversion for converting between a coaxial line and a plane substrate line, which is formed on a metal package. It is.
- a planar substrate line is a coplanar circuit having a center conductor, a front ground conductor, and a back conductor.A part of the front ground conductor of the coplanar circuit that is close to the center conductor has a predetermined portion near a conversion part with a coaxial line. , Characterized in that it has been removed into a predetermined shape.
- a part of the body is removed at a predetermined part near the conversion part with the coaxial line even if it is located 30 to 200 m away from the end of the surface ground conductor on the center conductor side of the surface ground conductor.
- a part of the surface ground conductor has a rectangular shape with the long side parallel to the center conductor, and the short side of the rectangle has a width of 20 ⁇ m—100 ⁇ m and the long side has a length of 200 ⁇ m— It has a triangular shape long in the direction parallel to the center conductor, even if it is 600 ⁇ m.
- the length of one side of the triangle is 20 ⁇ m—100 ⁇ m, and the other two sides are 200 ⁇ m— It may be 600 ⁇ m.
- a high-frequency signal converter of the present invention includes the above-described coaxial line-to-plane substrate conversion structure.
- a feature of the coaxial line-to-plane line substrate conversion structure of the present invention is that a part of the surface ground conductor of the coplanar circuit with the back surface conductor is removed in the conversion unit. As a result, in the coplanar circuit with the coaxial line and the back conductor, it is possible to realize a good frequency characteristic with little reflection, which was difficult with the conventional coaxial line-to-plane line substrate conversion structure.
- the present invention has an effect that it can be manufactured at the same cost as the conventional example.
- the surface pattern is drawn on the upper surface conductor of the ceramic substrate by photolithography or a direct drawing method using a laser or the like. And remove the conductor by etching This is because, in the case of the coplanar substrate with a backside conductor of the present invention, the coplanar substrate with the backside conductor can be manufactured simply by including a pattern for removing the ground conductor in addition to the conventional product in the lithography mask data.
- FIG. 1A is a schematic cross-sectional view for explaining conversion between a high-frequency coaxial connector having a coaxial line-to-plane substrate line conversion structure and a coplanar circuit with a backside conductor in a conventional high-frequency signal converter. It is a partial section top view.
- FIG. 1B is a side cross-sectional view of a schematic cross-sectional view for explaining conversion between a high-frequency coaxial connector having a coaxial line-to-plane substrate line conversion structure and a coplanar circuit with a backside conductor in a conventional high-frequency signal converter. is there.
- FIG. 2A is a partial cross-sectional top view of a schematic view showing a coaxial line-to-plane substrate line converter of the present invention. (Example 1)
- FIG. 2B is a side sectional view of a schematic view showing a coaxial line-to-plane substrate line conversion part of the present invention. (Example 1)
- FIG. 3A is a schematic cross-sectional view showing an electric field distribution in a converter of a high-frequency coaxial connector and a center conductor of Example 1.
- FIG. 3B is a schematic cross-sectional view showing an electric field distribution in a conventional high-frequency coaxial connector and a conversion part of a center conductor.
- FIG. 4 shows frequency characteristics of reflection of a coaxial line / plane substrate line conversion structure of a high-frequency signal converter according to Embodiment 1 of the present invention and a conventional example.
- FIG. 5A is a partial cross-sectional top view of a schematic view showing a coaxial line-to-plane substrate line conversion part of the present invention. (Example 2)
- FIG. 5B is a side sectional view of a schematic view showing a coaxial line-to-plane substrate line conversion part of the present invention. (Example 2)
- FIG. 2A and FIG. 2B are schematic diagrams showing a coaxial line-to-plane substrate line conversion unit according to Embodiment 1 of the present invention.
- the coaxial line-to-plane substrate line conversion structure of the signal converter 10 includes a coaxial line portion having a high-frequency coaxial connector 111 and a core wire 114, a coplanar circuit 100 with a backside conductor, and a metal package 110.
- the coplanar circuit 100 with the back surface conductor has a front ground 101, a center conductor 102, a through via 104 for conducting the back conductor 103 and the front ground 101, and a front ground 101 and a back conductor provided on the signal input / output end face. There is a cut-out portion 105 for conducting with 103.
- the width of the central conductor 102 and the gap 106 between the central conductor 102 and the surface ground 101 are manufactured so that the characteristic impedance is 50 ⁇ . In the high frequency range, the higher order mode of the coplanar circuit The width of the central conductor 102 needs to be narrow in order to prevent the generation. On the other hand, if the width of the center conductor 102 is too narrow, there are many mounting problems and the propagation loss increases.
- the width of the center conductor 102 is increased to about 200 to 400 m to facilitate connection.
- the conductor of the surface ground 101 of the coplanar circuit 100 is provided with a conductor removing portion 108 in which a part thereof is removed in a rectangular shape. It is desirable that the size of the removed surface ground 101 be between 200 and 600 ⁇ m in the horizontal direction in the signal propagation direction and between 20 and 100 ⁇ m in the vertical direction. The reason is that the length in the horizontal direction needs to be approximately the same as or slightly shorter than the center conductor tip 107, which is the portion where the center conductor is expanded in the conversion region.
- the width is required to be 20 ⁇ m or more in order to obtain the effect of the present invention, and if it is 100 ⁇ m or more, the frequency characteristics deteriorate.
- This position is desirably 30 to 100 ⁇ m away from the edge of the surface ground 101.
- the reason is that the width required for the surface ground 101 is 30 ⁇ m or more in order to obtain a sufficient ground for high frequency, and a certain width is necessary in consideration of manufacturing errors and ease of fabrication. In view of this, it is desirable that the distance is 30 m or more. It is desirable that the conductor removing portion 108 from which the conductor is removed in a rectangular shape is separated from the through via 104 and the cutout portion 105 by 30 m or more for the same reason.
- the coplanar circuit 100 is fixed between the coplanar circuit 100 and a metal package 110 using a conductive material such as solder. At this time, it is desirable in terms of frequency characteristics that the gap in the signal propagation direction between the coplanar circuit 100 and the metal package 110 be mounted as small as possible.
- a high-frequency coaxial connector 111 is fixed.
- This high-frequency coaxial connector 111 has a metal package 110 whose upper surface has a conductive material such as solder in a through-hole 112 provided toward an insertion hole of the high-frequency coaxial connector 111, and heats the metal package 110. After melting, it is fixed by cooling.
- This high-frequency coaxial connector 111 is also manufactured to have a characteristic impedance of 50 ⁇ ! RU
- FIG. 4 shows the frequency characteristics of the reflection of the coaxial line-to-plane substrate line conversion structure of the high frequency signal conversion in the first embodiment of the present invention and the conventional example.
- specific simulation results show that the surface ground conductor of the conventional example is removed, and that the present invention is expected to have an effect of reducing reflection in a wide range up to DC-50 GHz in comparison with the conversion structure. It is. In particular, at 30-40 GHz, the reflection reduction effect is as large as about 5 dB.
- the coplanar circuit 100 with a backside conductor is made using a dielectric substrate having a small loss of a high-frequency signal such as alumina ceramics (having a relative dielectric constant of 9 to 10).
- the dielectric substrate is provided with a through via 104 penetrating the front and back surfaces using a high-power laser or the like, and a cutout 105 in an input / output portion of an electric signal.
- gold is deposited on both sides of the substrate to a thickness of about 1 ⁇ m using a vapor deposition device such as sputtering.
- the film is formed so that gold is attached to the inner wall of the through via 104 and the notch 105 so that the front surface ground 101 of the substrate and the back conductor 103 are conducted. I do.
- a photoresist is applied to the surface, and a center conductor 102 and a surface ground 101 are formed by photolithography. At this time, a part of the surface ground 101 is removed at the same time, and a rectangular surface ground conductor removing portion 108 which is a feature of the present invention is manufactured.
- metal package 110 stainless steel having excellent workability, Kovar having a linear expansion coefficient close to that of alumina ceramics, or the like is used.
- the manufacturing method is not focused on the entire configuration of the metal package 110 but on the portion shown in FIG. 2A which is a conversion part necessary for explaining the present invention. explain.
- Metal packages 1 At the place where the ten high-frequency coaxial connectors 111 are to be inserted, holes for the coaxial connector fitting portions 113 for fitting the coaxial connectors 111 are formed by using a dedicated tool (not shown).
- a through-hole 112 is provided on the upper surface of the hole of the coaxial connector fitting portion 113 to reach this hole. Further, the surface of the metal package 110 is plated with gold in order to improve the electric characteristics and obtain the reliability.
- insert the high-frequency coaxial connector 111 into the metal package 110 fix it with a fixing jig (not shown), put solder into the through-hole 112 provided on the upper surface, and heat the metal package 110 to about 180 ° C where the solder melts. After that, the metal package 110 is cooled to fix the high-frequency coaxial connector 111.
- a coplanar circuit 100 with a back conductor is attached to the metal package 110 using a low-melting metal such as solder.
- a low-melting metal such as solder.
- the core wire 114 of the coaxial line and the tip 107 of the center conductor 102 of the coplanar circuit 100 are connected.
- a coaxial line-to-plane substrate conversion structure is completed by connecting with a conductive material 109 such as solder.
- FIGS. 5A and 5B are schematic diagrams showing a coaxial line-to-plane substrate line conversion unit according to Embodiment 2 of the present invention.
- the high-frequency signal converter 20 includes a coaxial line portion having a high-frequency It consists of a circuit 200 and a metal package 210.
- the structure of the high-frequency signal converter 20 and the coaxial line-to-plane substrate line conversion unit of the second embodiment is different from that of the first embodiment in that the conductor removal unit 108 of the rectangular surface ground 101 is a triangular conductor removal unit. Since it is the same as the first embodiment except for the part 208, the description of the same part will be omitted, and the description will focus on the conductor removing part 208.
- the conductor of the surface ground 201 of the coplanar circuit 200 is provided with a conductor removing part 208 whose part is removed in the shape of a right triangle as shown in Fig. 5A. Te ru.
- the size of the conductor removing portion 208 removed from the surface ground 201 is a triangle between 200 and 600 ⁇ m in the horizontal direction in the signal propagation direction and between 20 and 100 ⁇ m in the vertical direction. It has a shape. The reason is that the center conductor 202 extends in the conversion region in the horizontal direction. This is because a length approximately equal to or slightly shorter than the length of the center conductor tip 207 is required. Further, regarding the width, the effect of the present invention is required to be obtained at 20 m or more, and at 100 m or more, the frequency characteristics deteriorate.
- this position is 30 to 100 ⁇ m away from the edge of the surface ground.
- the reason for this is that the width of the surface ground must be 30 m or more to provide sufficient ground for high frequency, and that a certain width is necessary in consideration of manufacturing errors and ease of fabrication. To 30 m or more is desirable. For this reason, it is preferable that the through vias 204 and the cutouts 205 are separated by 30 m or more for the same reason.
- the metal package 210 has the same configuration as the metal package 110 of the first embodiment, and a description thereof will be omitted.
- the electric field distribution in the converter between the high-frequency coaxial connector 211 and the center conductor 202 in the second embodiment is similar to that of the high-frequency coaxial connector 511 in the conventional example, as shown in the first embodiment with reference to FIG.
- the electric field in the air above the surface ground 201 can be reduced as compared with the electric field distribution in the conversion part of the center conductor 502. Therefore, it is possible to suppress a decrease in characteristic impedance in the conversion unit, and it is possible to suppress reflection generated in the conversion unit.
- the method of manufacturing the high-frequency signal converter 20 having the coaxial line-to-plane substrate conversion structure of the second embodiment is also applied to the case where a photoresist is applied to the surface and the center conductor 202 and the surface ground 201 are formed by photolithography.
- the process is the same as that of the first embodiment except that a part of the surface ground 201 is removed and a triangular-shaped conductor removing portion 208 is provided at the same time.
- the method of manufacturing the conversion section required for the description of the present invention of the metal package 110 is also the same as the manufacturing method described in the first embodiment, and thus the description is omitted.
- the coaxial line-to-plane substrate conversion structure of the present invention is not limited to the above-described embodiment described with reference to the drawings, and is applied and implemented so as to obtain the same effect for the same purpose. be able to.
- the present invention is not limited to the rectangular or triangular shape of the conductor removal portion provided on the surface ground, and can be applied to other shapes such as a trapezoid. It is also possible to eliminate the end of the center conductor which is widened to facilitate connection of the center conductor in the converter, and to make the center conductor all the same width.
- the surface It is also possible for the conductor to be a part of the substrate surface, and it is also possible to provide two or more coaxial line-to-plane substrate line conversion structures in the same metal package.
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JP2004004157A JP2007123950A (ja) | 2004-01-09 | 2004-01-09 | 同軸線路−平面基板変換構造と高周波用信号変換器 |
JP2004-004157 | 2004-01-09 |
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WO2005067095A1 true WO2005067095A1 (ja) | 2005-07-21 |
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PCT/JP2004/019170 WO2005067095A1 (ja) | 2004-01-09 | 2004-12-22 | 同軸線路−平面基板変換構造と高周波用信号変換器 |
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Families Citing this family (7)
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JP5115253B2 (ja) | 2008-03-10 | 2013-01-09 | 富士通株式会社 | 同軸コネクタ搭載回路基板及び同軸コネクタ搭載回路基板の製造方法 |
JP5270474B2 (ja) * | 2009-07-02 | 2013-08-21 | アンリツ株式会社 | 高周波接続配線基板、およびこれを備えた光変調器モジュール |
JP6181777B2 (ja) | 2014-01-24 | 2017-08-16 | 京セラ株式会社 | 素子収納用パッケージおよび実装構造体 |
JP6871146B2 (ja) * | 2017-12-14 | 2021-05-12 | 日本電信電話株式会社 | コネクタおよびコネクタ−基板接続構造 |
JP6711862B2 (ja) * | 2018-06-22 | 2020-06-17 | 日本電信電話株式会社 | 高周波線路接続構造 |
JP7303773B2 (ja) | 2020-04-03 | 2023-07-05 | アンリツ株式会社 | 伝送線路変換構造 |
EP4325656A1 (en) | 2021-04-14 | 2024-02-21 | Kyocera Corporation | Package for accommodating electronic element, and electronic device |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60103903U (ja) * | 1983-12-19 | 1985-07-16 | 関西日本電気株式会社 | ストリツプ線路を有するプリント基板 |
JPS6214806U (ja) * | 1985-07-12 | 1987-01-29 | ||
JPH0371703A (ja) * | 1989-08-11 | 1991-03-27 | Hitachi Ltd | 多層基板の接続方法 |
JPH06350312A (ja) * | 1993-06-04 | 1994-12-22 | Nec Corp | 同軸コネクタと多層プリント基板の接続構造 |
JP2001094012A (ja) * | 1999-09-22 | 2001-04-06 | Toyota Central Res & Dev Lab Inc | 半導体チップ搭載基板及び高周波装置 |
JP2002217601A (ja) * | 2001-01-23 | 2002-08-02 | Sharp Corp | 回路装置 |
JP2003289208A (ja) * | 2002-03-28 | 2003-10-10 | Sumitomo Osaka Cement Co Ltd | 高周波線路の接続構造 |
-
2004
- 2004-01-09 JP JP2004004157A patent/JP2007123950A/ja active Pending
- 2004-12-22 WO PCT/JP2004/019170 patent/WO2005067095A1/ja active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60103903U (ja) * | 1983-12-19 | 1985-07-16 | 関西日本電気株式会社 | ストリツプ線路を有するプリント基板 |
JPS6214806U (ja) * | 1985-07-12 | 1987-01-29 | ||
JPH0371703A (ja) * | 1989-08-11 | 1991-03-27 | Hitachi Ltd | 多層基板の接続方法 |
JPH06350312A (ja) * | 1993-06-04 | 1994-12-22 | Nec Corp | 同軸コネクタと多層プリント基板の接続構造 |
JP2001094012A (ja) * | 1999-09-22 | 2001-04-06 | Toyota Central Res & Dev Lab Inc | 半導体チップ搭載基板及び高周波装置 |
JP2002217601A (ja) * | 2001-01-23 | 2002-08-02 | Sharp Corp | 回路装置 |
JP2003289208A (ja) * | 2002-03-28 | 2003-10-10 | Sumitomo Osaka Cement Co Ltd | 高周波線路の接続構造 |
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