JP2013152886A - High-frequency module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-frequency module capable of suppressing that stress is applied to a connection position between a high-frequency lead wire and a connection lead wire in an axial direction of the connection lead wire and its vertical direction, by a simple configuration.SOLUTION: In a high-frequency module, high-frequency lead wires 26a and 26b respectively formed to two wiring parts are electrically connected with each other via a connection lead wire 28 and a connection member 30. To the one high-frequency lead wire 26a, the connection lead wire 28 is fixed so as to connect the high-frequency lead wires 26a and 26b with each other at the shortest distance. To the other high-frequency lead wire 26b, the connection member 30 is fixed. To a bottom face of the connection member 30, a recessed part 30a having a height substantially equal to or slightly lower than a height of the connection lead wire 28 and having a width sufficiently larger than a width of the connection lead wire 28 is formed. The connection lead wire 28 is located in a gap between the connection member 30 and the high-frequency lead wire 26b, that is generated by this recessed part 30a.

Description

  The present invention relates to a high-frequency module configured by connecting a connection lead to a high-frequency lead formed on a wiring member.

  2. Description of the Related Art As a high-frequency module used in a communication device, a radar device, or the like, a configuration in which a core wire of a coaxial connector is electrically connected to a high-frequency conductor formed on a dielectric substrate is known (for example, see Patent Document 1). ). In the high frequency module described in Patent Document 1, a conductor block in which a groove or hole having a shape substantially equal to the axial diameter of the core wire of the coaxial connector is connected to the high frequency conductor, and the core wire of the coaxial connector is connected to the groove or hole of the conductor block. Is inserted, and the high-frequency conductor and the core wire of the coaxial connector are electrically connected. In the high-frequency module described in Patent Document 1, the high-frequency conductor and the core wire of the coaxial connector are connected at the shortest distance, so that good reflection characteristics can be obtained and the core wire of the coaxial connector moves in the axial direction with respect to the conductor block. Therefore, it is possible to suppress stress on the connection site due to thermal expansion or distortion with a simple configuration.

JP 2008-60042 A

  In recent years, such high-frequency modules are required to have complex and diverse functions, and wiring members on which high-frequency conductors are formed and members to be connected such as coaxial cables have become complicated and large. And since the connecting conductor of the connected member is connected to the high-frequency conductor in a limited space, it is connected not only to the stress in the axial direction of the connecting conductor but also to the connecting portion of the high-frequency conductor and the connecting conductor due to thermal expansion and distortion. Stress may be applied in a direction perpendicular to the axial direction of the conducting wire.

  The present invention has been made in view of such circumstances, and a high-frequency module capable of suppressing stress applied to the connection portion between the high-frequency conductor and the connection conductor in the axial direction of the connection conductor and the direction perpendicular thereto with a simple configuration. The purpose is to provide.

  In order to achieve the above object, a high-frequency module according to the present invention is a high-frequency module configured by connecting a connection lead to a high-frequency lead formed on a wiring member. The high-frequency module includes a connection member that is formed with an insertion portion having a height that is substantially equal to the height of the connection conductor and a width that is greater than the width of the connection conductor by a predetermined movement allowable length, and is fixed to the high-frequency conductor. In this high-frequency module, the connection conductor is inserted into the insertion portion of the connection member, and the high-frequency conductor and the connection conductor are electrically connected.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that a stress is applied to the connection part of a high frequency conducting wire and a connecting conducting wire by the simple structure to the axial direction of a connecting conducting wire, and its perpendicular | vertical direction.

It is a top view which shows the structure of the high frequency module which concerns on Embodiment 1 of this invention. FIG. 3 is an enlarged view showing a connection portion of a high-frequency conductor according to Embodiment 1. 3 is a perspective view showing a connection member according to Embodiment 1. FIG. 3 is a schematic diagram showing a connection portion of a high-frequency conductor according to Embodiment 1. FIG. 3 is a cross-sectional view showing a cross section of a connection portion of the high-frequency conductor according to Embodiment 1. FIG. 6 is a perspective view showing another example of a connection member according to Embodiment 1. FIG. 6 is a perspective view showing a connection member according to Embodiment 2. FIG. 10 is an enlarged perspective view showing another example of a connection member according to Embodiment 2. FIG. It is a perspective view which shows the connection member of a 1st modification. It is a figure which shows the connection member of a 2nd modification, (a) is a perspective view, (b) is a sectional side view.

  Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG.
The high frequency module 20 according to the first embodiment of the present invention is configured as a part of a communication device, a radar device, or the like, for example. As shown in FIG. 1, the high-frequency module 20 is provided with a plurality of wiring portions 24 a and 24 b on a base body 22, and the high-frequency conductors 26 a and 26 b in the plurality of wiring portions 24 a and 24 b are connected to a connection conductor 28 and a connection member. 30 and are electrically connected to each other. In FIG. 1, only the high-frequency conductors 26a and 26b in the vicinity of the wiring portions 24a and 24b that are electrically connected to each other by the connection member 28 and the connection member 30 are illustrated. Since it does not form the core, illustration is omitted.

  The base body 22 is made of, for example, aluminum (linear expansion coefficient 24 ppm / ° C.) having a relatively large linear expansion coefficient. On the base body 22, a plurality of wiring parts 24a, 24b and other parts not shown are fixed by bonding, soldering, screwing or the like. As an example, in this embodiment, as shown in FIG. 2, two wiring portions 24 a and 24 b are fixed to the base body 22 via a fixing material (such as an adhesive or a solder material) 23.

  In this embodiment, as shown in FIG. 1, the wiring portions 24a and 24b are arranged on the base body 22 so that the vicinity of one end of each side faces each other. The wiring portions 24a and 24b are, for example, a metal-wall package such as a laminated package of alumina / ceramics (7 to 9 ppm / ° C.), copper molybdenum (9 to 11 ppm / ° C.), Kovar (4 to 5 ppm / ° C.), FR− 4. It is composed of an organic substrate such as BT resin (14 to 16 ppm / ° C.) and has a smaller linear expansion coefficient than the base body 22. High frequency conductors 26a and 26b are formed in patterns on the wiring portions 24a and 24b, respectively.

  Each of the high-frequency conductors 26a and 26b constitutes a part of a high-frequency circuit in the high-frequency module 20, and an electrical signal in the millimeter wave band or the microwave band flows. The high-frequency conductors 26 a and 26 b are connected to one high-frequency conductor 26 a with the connecting conductor 28 and the other high-frequency conductor 26 b with the connecting member 30, and are electrically connected to each other via the connecting conductor 28 and the connecting member 30. . Here, it is desirable that the connection portions of the high-frequency conductors 26a and 26b are formed so that the respective connection ends are positioned coaxially so as to have a low impedance. Moreover, the site | part to which the connection member 30 is attached among high frequency conducting wire 26a, 26b is formed wide according to the magnitude | size of the connection member 30. FIG. As an example, each of the high-frequency conductors 26a and 26b is formed with a width Wa of 0.4 mm, and a width Wb of a portion to which the connection member 30 is attached is formed with 0.8 mm. Note that the portions of the high-frequency conductors 26 a and 26 b to which the connection member 30 is attached may be formed slightly larger or slightly smaller than the connection member 30.

  The connection conductor 28 is provided so as to electrically connect the high-frequency conductors 26a and 26b at the shortest distance, is fixed to one high-frequency conductor 26a, and extends toward the other high-frequency conductor 26b. For example, Kovar, phosphor bronze, beryllium copper, or the like can be used for the connecting conductor 28. As an example, the connection conductor 28 is a round conductor having a diameter φ of about 0.3 mm, which is individually manufactured by machining or wet etching and plated with gold, etc., a width of 0.3 mm, and a thickness of 0.1 mm. Ribbon-type conducting wires of about 0.3 mm can be used. Further, the connection conductor 28 and the high-frequency conductor 26a can be fixed by, for example, brazing or soldering. However, the connection conductor 28 is not limited to the one that is fixed to the high-frequency conductor 26a, and one that is formed in advance in the wiring portion 24a may be used.

  The connection member 30 is made of the same material as the connection conductor 28 and is individually manufactured by machining or wet etching. The connection member 30 is subjected to a surface treatment such as plating with nickel or gold so that the connection member 30 can be fixed to the high-frequency conductor 26b. As shown in FIG. 3, the connection member 30 has a rectangular parallelepiped shape as a whole, and a recess (insertion portion) 30a for inserting the connection conductor 28 is formed on the bottom surface. The recess 30a is designed so that the height Hc thereof is equal to or slightly smaller than the height of the connection conductor 28 when the connection member 30 is attached to the high-frequency conductor 26b. The width Wc is designed to be sufficiently larger than the width of the connection conductor 28. The height Hc of the recess 30a is desirably designed in consideration of the thickness (for example, the thickness of the adhesive 27 such as a brazing material or a solder material) generated by the fixation with the connecting conductor 28. The design of the width Wc will be described later. As an example, when a round conducting wire having a diameter φ of 0.3 mm (allowable accuracy +0.05 mm to −0.00 mm) is used as the connecting conducting wire 28, the height Hc of the recess 30 a of the connecting member 30 is set to 0. It can be designed to be 25 mm (acceptable accuracy +0.00 mm to −0.05 mm), width Wc is 0.6 mm, and thickness t of the outer edge of the recess 30a is uniformly 0.1 mm.

  When the connection conductor 28 and the connection member 30 are fixed to the high-frequency conductors 26a and 26b, first, the connection conductor 28 is arranged so as to bridge the high-frequency conductors 26a and 26b, and the connection conductor 28 is connected to the high-frequency conductor 26 by brazing or soldering. It adheres to 26a. Subsequently, as shown in FIG. 4, the connection member 30 is arranged and fixed on the high-frequency conductor 26 b so that the connection conductor 28 is positioned in the recess 30 a of the connection member 30 and the high-frequency conductor 26 b and the connection conductor 28 are in contact with each other. . For fixing the high-frequency conductor 26b and the connecting member 30, for example, manual soldering is performed using thread solder, or a paste solder is preliminarily deposited on the high-frequency conductor 26b by a known method such as dispenser, screen printing, or plating. It is conceivable that solder (for example, a thickness of about 20 μm) is applied and soldering is performed by applying a load and heat from the upper surface side of the connection member 30 with a resistance welding machine or the like. As shown in FIG. 5, the connecting member 30 is preferably arranged so that the tip of the connecting conductor 28 is positioned in the recess 30 a of the connecting member 30. As an example, the connecting member 30 has an axial direction ( The length L in the extending direction) can be set to 0.4 mm, and the connecting conductor 28 can be designed to be positioned 0.25 mm inside the connecting member 30 (length La = 0.25 mm in FIG. 5). However, the tip of the connecting conductor 28 is not limited to the one positioned in the recess 30 a of the connecting member 30, and the tip of the connecting conductor 28 may be designed to protrude from the end of the connecting member 30. As shown in FIGS. 4 and 5, the connection conductor 28 is sandwiched between the high-frequency conductor 26b and the connection member 30 as shown in FIGS. 4 and 5 by the connection of the connection conductor 28 and the connection member 30 to the high-frequency conductors 26a and 26b. The high frequency conductors 26a and 26b are electrically connected.

  In the high-frequency module 20 of this embodiment, the connecting member 28 fixed to one high-frequency conducting wire 26a is sandwiched between and contacted by the other high-frequency conducting wire 26b and the connecting member 30, and the connecting conducting wire 28 and the high-frequency conducting wire 26b or connecting member are contacted. 30 is not fixed. Further, the recess 30 a of the connection member 30 has a width Wc larger than the width of the connection conductor 28. For this reason, the connecting wire 28 can move in the axial direction with respect to the connecting member 30 and also moves in a direction perpendicular to the axial direction (hereinafter also referred to as “vertical direction”) in the recess 30 a of the connecting member 30. In addition, it is possible to suppress stresses in the axial direction and the vertical direction of the connecting conductor 28 from being applied to the connecting portions of the high frequency conductors 26a and 26b with a simple configuration. That is, the recess 30a of the connection member 30 is formed with a width Wc larger than the width of the connection conductor 28 by a predetermined allowable movement length in consideration of the case where the connection conductor 28 moves in a direction perpendicular to the connection member 30. It has been done. For example, it is assumed that the base body 22 is formed of aluminum having a linear expansion coefficient of 24 ppm / ° C., and the wiring portions 24a and 24b are formed of alumina ceramics having a linear expansion coefficient of 7.0 ppm / ° C., resulting in a temperature change of 50 ° C. Assuming that the wiring portions 24a and 24b expand and contract with respect to the connection point 30 in the vertical direction of the connection lead 28, the connection lead 28 is displaced by 0.095 mm in the vertical direction with respect to the connection member 30. When the connection member 30 is formed with the dimensions described above, the connection conductor 28 can move up to ± 0.15 mm in the vertical direction within the recess 30a of the connection member 30. Therefore, the high-frequency conductor 26a can be moved by such a temperature change. , 26b can be prevented from being stressed. The width Wc of the concave portion 30a of the connecting member 30 may be appropriately designed based on the material and dimensions of the base body 22 and the wiring portions 24a and 24b, an assumed temperature change, and the like. In this embodiment, since the connecting wire 28 and the connecting member 30 are formed of the same material, stress and gaps in the height direction are caused between the connecting wire 28 and the connecting member 30 due to expansion / contraction due to temperature change. It can also be suppressed.

  Further, in recent years, in the high-frequency module, the electric signal used has become high frequency. For example, when the high-frequency conductors 26a and 26b of the wiring portions 24a and 24b are connected by a gold wire or the like, an extra length portion such as a gold wire or the like. As a result, the reflection characteristics between the high-frequency conductors 26a and 26b are greatly deteriorated. On the other hand, in the high frequency module 20 of this embodiment, since the high frequency conductors 26a and 26b are electrically connected by the straight connection conductor 28 at the shortest distance, good reflection characteristics can be obtained.

  In this embodiment, the connection member 30 has a recess 30a, and the connection conductor 28 is inserted into the gap between the connection member 30 and the high-frequency conductor 26b generated by the recess 30a. As illustrated, an insertion hole (insertion portion) 30Aa may be formed through the connection member 30A, and the connection conductor 30 may be inserted into the insertion hole 30Aa so that the connection member 30A is fixed to the high-frequency conductor 26b. In this case, the connection conductor 28 and the high-frequency conductor 26b are electrically connected via the connection member 30A. The insertion hole 30Aa is designed such that the height Hh is substantially the same as or slightly smaller than the height of the connection conductor 28, and the width Wh is sufficiently larger than the width Wc of the recess 30a of the connection member 30. Has been. As an example, when a round lead wire having a diameter φ of 0.3 mm (allowable accuracy +0.05 mm to −0.00 mm) is used as the connecting lead wire 28, the height Hh of the insertion hole 30Aa of the connecting member 30A is set to 0. .3 mm (allowable accuracy +0.00 mm to -0.05 mm), width Wh can be designed to be 0.6 mm, and thickness t of the outer edge of the insertion hole 30Aa can be uniformly set to 0.1 mm. In addition, when the connection member 30A is formed with this dimension, the height Hh of the insertion hole 30Aa is generally smaller than the height of the connection conductor 28. When using the connection member 30A in which the insertion hole 30Aa is formed, the connection lead 28 is first fixed to the high-frequency lead 26a, and then the connection lead 28 is inserted into the insertion hole 30Aa to fix the connection member 30A to the high-frequency lead 26b. Alternatively, the connecting member 30A may first be fixed to the high frequency conductor 26b, and then the connecting conductor 28 may be inserted into the insertion hole 30Aa to fix the connecting conductor 28 to the high frequency conductor 26a.

Embodiment 2. FIG.
The configuration of the high-frequency module according to Embodiment 2 of the present invention is the same as the configuration of the high-frequency module 20 according to Embodiment 1 except for the connecting member 130. In the connection member 130 of the high-frequency module according to the second embodiment, the concave portion 30a is formed on the bottom surface similarly to the connection member 30 according to the first embodiment, and the upper surface of the concave portion 30a is formed thin as shown in FIG. In addition, the height Hc of the recess 30 a is formed slightly smaller than the height of the connection conductor 28. As an example, the dimensions of the concave portion 30a of the connection member 130 can be the same as those in the first embodiment, and the side surface thickness ta of the concave portion 30a can be designed to be 0.1 mm, and the upper surface thickness tb can be designed to be 0.05 mm. In this way, the upper surface of the recess 30a is formed thin, so that the upper surface of the recess 30a has a spring property. In the high-frequency module according to the second embodiment, when the connection conductor 28 is inserted into the gap between the connection member 130 and the high-frequency conductor 26b generated by the recess 30a, the upper surface of the connection member 130 bends slightly upward and the restoring force of the connection member 130 is restored. Thus, the contact between the connection conductor 28, the connection member 130, and the high-frequency conductor 26b is preferably maintained.

  Further, as shown in the connection member 130A of another example in FIG. 8, the insertion hole 30Aa is formed through the connection member 130A, the upper surface of the insertion hole 30Aa is formed thin, and the height of the insertion hole 30Aa. Hh may be formed slightly smaller than the height of the connecting conductor 28. In this case, it is preferable that the bottom surface of the insertion hole 30Aa is formed with a certain thickness. As an example, the dimensions of the insertion hole 30Aa of the connection member 130A are the same as the dimensions of the insertion hole 30Aa of the connection member 30A of the first embodiment, the thickness th of the side surface and the thickness td of the bottom surface of the insertion hole 30Aa are 0.1 mm, The thickness tu can be designed to be 0.05 mm or the like. As described above, the bottom surface of the insertion hole 30Aa is formed with a certain thickness so that a connection plane between the connection member 130A and the high-frequency conductor 26b can be secured.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and applications are possible. For example, in the above-described embodiment, the connection members 30 and 130 have a shape in which the recess 30a is formed on the bottom surface of the rectangular parallelepiped. However, as illustrated in the connection member 30B in FIG. A fixing portion 30b extending in the width direction may be formed. Further, such a fixing portion 30b may be provided in the connection members 30A and 130A in which the insertion holes 30Aa are formed.

  In the above-described embodiment, the upper surfaces of the recesses 30a and the insertion holes 30Aa of the connection members 30, 30A, 130, and 130A are planar. For example, as shown in the connection member 30C of FIG. The convex part 30c which becomes convex on the side may be formed. In this case, the height of the lower end of the protrusion 30c and the high-frequency conductor 26b (in the case of the connection members 30A and 130A in which the insertion hole 30Aa is formed, the bottom surface of the insertion hole 30Aa) is designed to be slightly smaller than the height of the connection conductor 28. Is done. In this case, the upper surface of the connection member 30C and the convex portion 30c may be formed to have elasticity. Thus, by forming the convex portion 30c that protrudes downward on the upper surface of the connection member 30C, the convex portion 30c is reliably brought into contact with the connection conductive wire 28 to ensure contact between the connection conductive wire 28 and the connection member 30. can do.

  In the embodiment described above, the recesses 30a and the insertion holes 30Aa of the connection members 30, 30A, 130, and 130A are formed in a rectangular parallelepiped shape through the connection members 30, 30A, 130, and 130A. A recess 30a or an insertion hole 30Aa other than a rectangular parallelepiped shape may be formed such that the four corners are formed into round corners. Further, the recess 30a and the insertion hole 30Aa are not limited to those formed through the connecting members 30, 30A, 130, and 130A, and do not need to pass through the connecting members 30, 30A, 130, and 130A. Further, the connecting members 30, 30A, 130, and 130A themselves are not limited to a rectangular parallelepiped shape as a whole, and any shape may be used as long as the recess 30a and the insertion hole 30Aa are formed.

20 High-frequency module 22 Base body 24a, 24b Wiring part 26a, 26b High-frequency conductor 28 Connection conductor 30, 130 Connection member 30a Recess 30A, 130A Connection member 30Aa Insertion hole 30B, 30C Connection member 30b Adhering part 30c Projection

Claims (6)

A high frequency module configured by electrically connecting a connection lead to a high frequency lead formed on a wiring member,
An insertion portion having a height substantially equal to the height of the connection conductor and having a width larger than the width of the connection conductor by a predetermined movement allowable length, and a connection member fixed to the high-frequency conductor;
The connection conductor is inserted into an insertion portion of the connection member, and the high-frequency conductor and the connection conductor are electrically connected;
High frequency module. The insertion portion is a recess formed in the connection member;
The connection conductor is in contact with the recess of the connection member and the high-frequency conductor;
The high frequency module according to claim 1. The insertion part is a hole formed in the connection member,
The connection conductor is electrically connected to the high-frequency conductor through the connection member.
The high frequency module according to claim 1. The connection member is made of an elastic member, and the upper surface of the insertion portion is formed thin and the height of the insertion portion is slightly smaller than the height of the connection conductor.
The high frequency module according to any one of claims 1 to 3. On the upper surface of the insertion portion of the connection member, a convex portion that is convex downward is formed.
The high frequency module according to any one of claims 1 to 4. The connection conductor is fixed to a high-frequency conductor different from the high-frequency conductor formed in the wiring member.
The high frequency module according to any one of claims 1 to 5.

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