JP2002305062A - Connector device - Google Patents

Abstract

(57) [Problem] To provide a surface mount type connector device for connecting a coaxial cable and a transmission line formed on a substrate surface, wherein a characteristic impedance does not change rapidly and a transmission loss is reduced as compared with a conventional device. Provision of a connector device to reduce. A connector device (10) is connected to an inner conductor of a coaxial cable at one end, and to a center conductor (16a) of a transmission line at another end. The connecting portion E of the central conductor 11 is inclined with respect to the mounting and fixing surface 12a so that the central conductor 11 is inclined with respect to the substrate surface and connected to the transmission line. are doing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount type connector device suitable for high frequencies such as microwaves and millimeter waves. In particular, the present invention relates to a surface mount type connector device that can be easily connected to a transmission line formed on one surface of a substrate, for example, a transmission line of a glass antenna provided on a glass plate.

[0002]

2. Description of the Related Art Today, demands for high-speed, large-capacity communication require
High-frequency communication for transmitting and receiving radio waves using microwaves and millimeter waves has been rapidly expanding, and various antenna devices having a planar antenna formed on a substrate surface have been proposed in response to the spread. This antenna device has a planar antenna formed on a substrate surface, and a transmission line provided on the same substrate surface as the planar antenna, and the transmission line is a surface mount type mounted on the substrate surface. It is connected to a coaxial cable via a connector device and further to various circuits.

As an example of this surface mount type connector device,
A surface mount type connector 5 as shown in FIGS.
0. FIG. 5A is a perspective view of the connector 50, and FIG. 5B is a perspective view of the connector 50 shown in FIG.
(A-a 'section is composed of a section including the center line CL and the axis a in FIG. 5A and a section including the center line CL and the axis a' in FIG. 5A). It is shown. FIG. 5 (a),
The connector 50 shown in (b) has an outer conductor 51, a center conductor 52, and an insulator 53 for fixing and holding the outer conductor 51 and the center conductor 52, and the outer conductor 51 is a lead terminal 51a for soldering. The center conductor 52 has lead terminals 52a for soldering. When the connector 50 configured as described above is mounted on a board, the lead terminals 51a and 52a for soldering are respectively mounted on a copper foil pattern of a conductor formed on the board and soldered. I do.

[0004]

Generally, in a transmission line in a high-frequency circuit, sudden bending of the transmission line causes disturbance of an electric field in a bent portion, and the relationship between a signal transmitting conductor and a surrounding ground conductor. Causes a sudden change in the characteristic impedance determined by the above, causing transmission loss. Therefore, it is preferable that the transmission line has no bent portion. Further, it is preferable that the connection between the transmission lines is configured so that the characteristic impedance does not change from the viewpoint of reducing the transmission loss.

[0005] The same applies to the characteristic impedance of a connector having a center conductor for connecting a transmission line and a coaxial cable formed on a substrate. That is, in the connector, it is generally preferable that the central conductor of the connector does not bend and the characteristic impedance does not change rapidly. In addition, the transmission line on the substrate surface and the planar circuit having the transmission line are formed by considering the relative permittivity of the substrate material, the thickness of the substrate, the thickness of the conductor of the transmission line, the conductivity of this conductor, and the like. The width of the conductor of the transmission line, the position of the ground conductor provided around the conductor, and the like are set so that the characteristic impedance has a predetermined value. When a connector is connected to such a transmission line or a planar circuit, the characteristic impedance of the connector is adjusted so that the change in the characteristic impedance is reduced in order to reduce the transmission loss at the connection portion and improve the transmission characteristics. Is preferred. The same applies to the connection from the coaxial cable to the connector.

However, in the conventional surface mount type connector 50 shown in FIGS. 5A and 5B, the characteristic impedance is partially large because the center conductor 52 is bent perpendicularly to the substrate. Therefore, there is a problem that a large transmission loss occurs. Further, the connector 50 does not consider adjusting the characteristic impedance in the connection portion with the board, and the transmission loss in the connection is large,
There has been a problem that the transmission loss increases as the frequency increases.

In addition, the connector 50 has an extra space for attaching and detaching the coaxial cable in a direction perpendicular to the board surface when attaching and detaching the coaxial cable since the connecting direction of the coaxial cable is perpendicular to the board surface. Is required. Therefore, even if the height of the connector itself is reduced, there is a problem that extra space for attaching and detaching the coaxial cable is still required. Furthermore, the connector 50 is often used inside a housing of a device or the like. For example, it has been studied that the connector 50 is substantially exposed on a glass surface and mounted in a bare state. Absent. Therefore, when the connector 50 is used while being substantially exposed, the coaxial cable connected to the connector 50 is unexpectedly touched by cleaning or the like, and force is suddenly applied to the connector 50. There was a problem of being peeled off from the surface and being damaged. Therefore, 3GH
At present, a surface mount type connector suitable for high frequency in a frequency band up to about z or a microwave band higher than this frequency band has not been provided.

The present invention has been made to solve the above problems, and is a surface mount type connector device for connecting a transmission line formed on a substrate surface to a coaxial cable.
It is an object of the present invention to provide a surface mount type connector device suitable for high frequencies such as microwaves and millimeter waves, in which characteristic impedance does not change abruptly and transmission loss can be reduced as compared with the related art.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a mounting and fixing surface for mounting and fixing on a board surface, and is formed on a coaxial cable and the board surface. A surface conductor type connector device for connecting the transmission line to the inner conductor of the coaxial cable at one end and a center conductor connected to the transmission line conductor at the other end. A connector device is provided in which a connection portion of the center conductor is inclined with respect to the fixing surface so that the center conductor is inclined with respect to the substrate surface and connected to the transmission line. .

Here, the inclination angle at which the center conductor of the connector device of the present invention is inclined with respect to the fixing surface is 5 degrees.
It is preferably between -80 degrees. Or 100-17
Preferably it is 5 degrees. The transmission line is, for example, a coplanar waveguide (Coplanar W).
aveguide (hereinafter referred to as CPW) line, that is, a transmission line in which a central conductor having a constant width is sandwiched from both sides by ground conductors at a predetermined distance, and the central conductor is connected to the central conductor of the coplanar waveguide line. Is done. In the connector device of the present invention, for example, the outer periphery of the center conductor is covered with an insulator, and a metal case is provided outside the insulator so as to cover the insulator.
When this connector device is connected to a coplanar waveguide line, taking into account the swelling and deviation during solder mounting and mounting when mounting and fixing the mounting and fixing surface of the connector device to the substrate surface by soldering, It is preferable that the connector device satisfies the following expressions (1) and (2). d ≦ s (1) D ≧ s + 2 · w (2) where d is the width of the central conductor at the connection portion of the connector device, and D is the metal covering the insulator at the connection portion of the connector device. The width of the gap of the case, s: the width of the central conductor of the coplanar waveguide line, w: the separation distance between the ground conductor and the central conductor of the coplanar waveguide line.

Further, a voltage standing wave ratio (VSWR) by connecting the coaxial cable to the transmission line is 6 GHz.
It is preferable that the frequency be up to 1.5 at frequencies up to and the insertion loss be 0.5 dB or less. Further, when the connector device of the present invention is connected to the transmission line on the substrate surface by soldering, it is preferable that the tensile strength for peeling the connector device from the substrate surface by an external force be 100 N or more. The substrate on which the connector device of the present invention is mounted and fixed is preferably a glass plate.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a connector device according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

FIG. 1 shows a state in which a surface mount type coaxial connector (hereinafter, simply referred to as a connector) 10, which is an example of the connector device of the present invention, is mounted on a substrate surface. FIG. 2A is a cross-sectional view of the connector 10 shown in FIG.
2 shows the rear surface of the connector 10 when the connector 10 is viewed from the direction of arrow A shown in FIG.

That is, the connector 10 has a center conductor 11 for transmitting a signal, a metal case 12 functioning as a ground conductor, and an insulator 13 for separating the center conductor 11 from the metal case 12. , The metal case 12
A mounting / fixing surface 12 a for mounting and fixing on the substrate surface of the substrate 14 made of a glass plate is provided on the bottom surface of the connector 10. On the other hand, FIG.
As shown in FIG. 1, a CPW line 16 which is a kind of transmission line is formed. The center conductor 16a of the CPW line 16 is sandwiched between the ground conductor 15 and both sides of the ground conductor 15 at a fixed distance w (see FIG. 3). The connector 10 is further mounted on the grounding conductor 15 on the board surface with the mounting and fixing surface 12 a of the metal case 12 of the connector 10 connected to the grounding conductor 15 by solder 18. Conductor 1
1 is connected to the center conductor 16a of the CPW line 16 by the solder 17, so that it is fixedly held on the board surface and mounted.

In FIG. 2A, one end of the center conductor 11 is connected to an inner conductor of a jack (not shown) on the coaxial cable side at a position B in parallel with the board surface of the board 14. The metal case 12 is connected to the external conductor of the jack on the coaxial cable side at a position C. The central conductor 11 functions as a transmission line for transmitting a signal, and the metal case 12 functions as a ground conductor. The center conductor 11 is bent at an obtuse angle at a position G in the direction of the board on which the connector 10 is mounted (the lower side in the figure in FIG. 2A), and the other end of the bent center conductor 11 is connected to the connector 10. The center conductor 16 on the board surface when mounted on the board surface
The center conductor 11 extends to the position of the mounting and fixing surface 12a near the substrate surface so as to be solderable to the connection part E. An insulator 13 is formed around the center conductor 11 so as to cover the outer periphery of the center conductor 11 up to or near the distal end of the connection portion E, in the same coaxial structure as the coaxial cable. As a material of the insulator 13, a fluorine-based resin such as polytetrafluoroethylene (PTFE) is preferable, but polyethylene or the like can also be used. Note that the characteristic impedance of the connection portion E is the
It is set to a predetermined value (generally 50Ω for a high-frequency transmission line) so as to be the same as the characteristic impedance of the line 16.

Here, the center conductor 11 of the connector 10 is
CPW line 1 bent at position G and inclined with respect to the substrate surface
6 so as to be connected to the central conductor 16a.
Is 5 to 80 degrees with respect to the mounting and fixing surface 12a of the connector 10 (when represented by an angle θ shown in FIG.
(0 to 175 degrees). Preferably, it is 20 to 70 degrees (angle θ: 110 to 160
Degree) It is better to incline. Further, in order to improve the transmission characteristics without increasing the size of the entire connector 10, 30-60 degrees (angle θ: 120 degrees) with respect to the mounting and fixing surface 12a.
(-150 degrees) is more preferable. As described above, since the connection portion E of the connector 10 is inclined with respect to the mounting / fixing surface 12a, the mounting / fixing surface 12a is
When it is mounted and fixed in accordance with the substrate surface of
1 is inclined with respect to the center conductor 16a of the CPW line 16, that is, the angle θ is 100 to 175 degrees, and the connection E is smoothly connected to the center conductor 16a.

On the other hand, as shown in FIG. 3, the CPW line 16 has a center conductor 16a having a width of s and a predetermined distance w around the center conductor 16a.
And a center conductor 16a such that the characteristic impedance has a predetermined value, for example, 50Ω.
Is set based on the relative permittivity of the substrate 14 and the conductivity and thickness of the center conductor 16a and the ground conductor 15. The CPW line 16 is described in a literature (for example, a title: Microstrip Lin).
es and Slotlines Publisher: Arte
ch House Author: K. C. Gupta et al.). Then, the connection portion E of the center conductor 11 of the connector 10 is soldered to the end portion F of the center conductor 16a with solder 17 and connected.

Here, the width d of the center conductor 11 of the connector 10 (see FIG. 2B) depends on the CPW line 16 on the substrate 14.
It is preferable that the width substantially coincides with the width s of the central conductor 16a from the viewpoint of reducing transmission loss. Furthermore, the diameter D of the insulator 13 at the connection portion E connected to the CPW line 16, that is, the width D of the gap between the metal cases 12 covering the insulator 13.
2 (see FIG. 2B) is preferably substantially equal to the interval s + 2 · w of the ground conductor 15 on the substrate 14. However, taking into account the swelling of the solder 17 due to soldering and the deviation and variation during mounting, the equations (1) and (2) are used.
And the characteristic impedance of the connector 10 is CPW
It is preferable that the impedance is set so as to be the same as the characteristic impedance of the line 16 (usually 50Ω in a high-frequency transmission line).

Although the connector 10 is connected to the CPW line 16, it may be connected to a strip transmission line in the present invention. In this case, the center conductor 11 is connected to the strip conductor of the strip transmission line, and the metal case 12 is connected to the ground conductor formed on the surface opposite to the substrate surface on which the strip conductor is formed.

The connector 10 has an automatic toll collection system (E) for automatically collecting tolls on expressways and toll roads.
TC: Electric Toll Collect
Although the connector device of the present invention is not limited to the 5.8 GHz high frequency of the ETC system, the connector device of the present invention is not limited to the 5.8 GHz high frequency band of the ETC system. Also suitable. Radio waves in ultra-high frequency or microwave bands, for example, 800 MHz band (810-960 MHz) for car phones, and 1.5 GHz band (1.429-1.501) for car phones.
GHz), UHF band (300MHz-3GHz), GP
It can also be used at high frequencies, such as the GPS signal 1575.42 MHz of the S satellite. Further, depending on the machining accuracy of the connector, radio waves in the millimeter wave band, for example, 100
It can be used for high frequencies up to GHz.

In such a connector 10, the high-frequency signal transmitted from the coaxial cable is transmitted to the position B of the center conductor 11.
And transmitted through the central conductor 11 bent at the position G to reach the connection portion E. At this time, the bent portion at the position G does not bend at a right angle as in the related art, but at an obtuse angle.
Further, the connection portion E is inclined with respect to the center conductor 16a of the CPW line 16 via the solder 17, and the angle θ: 100
They are connected at an obtuse inclination angle of １７175 degrees. Therefore, the characteristic impedance does not change abruptly as in the related art, and the transmission loss is reduced as compared with the related art. That is, the transmission characteristics are improved as compared with the related art. On the other hand, metal case 1
Numeral 2 is connected to the outer conductor of the coaxial cable which is grounded, and further connected to the ground conductor 15 via the mounting and fixing surface 12a, and always keeps a constant potential. It should be noted that the metal case 12 always holds a constant potential, and if the characteristic impedance is held in relation to the center conductor 11, the metal case 12 in a portion that does not affect the characteristic impedance is sharply bent. Is also good. The same applies when a high-frequency signal is transmitted from the transmission line through the connector 10 to the coaxial cable.

In such a connector 10, a voltage fluctuation ratio of a standing wave generated by an incident wave of a high-frequency signal and a reflected wave generated due to a change in impedance, that is, a voltage standing wave ratio (VSWR) of up to 6 GHz. The inclination angle of the connection portion E, the width d of the central conductor 11, and the width D of the gap between the metal cases 12 are set so that the frequency is not more than 1.5. Also, the inclination angle of the connection portion E, the width d of the center conductor 11 and the width D of the gap of the metal case 12 are set so that the insertion loss of the supplied high-frequency signal power is 0.5 dB or less.
Is set. Further, the connector 10 is connected to C by soldering.
When the connector 10 is connected to the PW line 16, the mechanical tensile strength for peeling the connector 10 from the board surface by an external force is 10
0N or more. Further, since the connector 10 has a direction of attaching and detaching the coaxial cable parallel to the board surface of the board 14, the connector 10 has an extra space for attaching and detaching the coaxial cable which the conventional connector requires in the vertical direction of the board surface. It is not necessary to secure a sufficient space on the substrate surface.

The present invention is not limited to the configuration in which the direction of attaching and detaching the coaxial cable is parallel to the board surface of the board 14 like the connector 10. As shown in FIG. 4, a center conductor 41 having no bent portion is covered with an insulator 43, and a metal case 42 is provided on the outer periphery of the insulator 43. The connector 40 may be oblique to the connector. In this case, since the bent portion of the center conductor 41 is completely eliminated, the characteristic impedance in the connector 40 becomes constant, and the transmission characteristics are improved.

The connector 10 is mounted on a glass plate as the substrate 14, but the substrate 14 is not limited to a glass plate, but may be a ceramic substrate or a printed substrate. In this case, various dimensions are set in consideration of the relative permittivity of the substrate material, the thickness of the substrate, the thickness of the conductor of the transmission line formed on the substrate, the conductivity of the conductor, and the like. Also, the connector 10
The connector may be exposed to the outside without being covered and protected by the housing, or may be a connector used inside the housing and protected by the housing. The connector 10 is a surface-mounted coaxial connector suitable for a glass antenna for high frequency applications such as microwaves and millimeter waves using a glass plate as a substrate.
The present invention is not limited to this, and can be used as a surface mount type coaxial connector that connects to a general high-frequency circuit.

(Embodiment) FIGS. 1 and 2 (a) and (b)
The connector 10 of the present invention was manufactured using the configuration of the connector 10 shown in FIG. At this time, the diameter (width) d of the center conductor 11 is set to 0.5 mm, the insulator 13 is made of PTFE, and the diameter (width) of the insulator 13, that is, the metal case 1 is used.
The width D of the gap 2 was 1.7 mm. Since PTFE has a relative dielectric constant of 2.1, the characteristic impedance was approximately 50Ω when formed in such a coaxial shape. Center conductor 11
The angle θ at the connection portion E was 135 °. Further, a transmission line of the CPW line 16 as shown in FIG. 3 formed by firing a silver paste on the surface of a glass plate as the substrate 14 was formed. At this time, the width s of the center conductor is 1.
The distance was set to 0 mm, the separation distance w was set to 0.3 mm, and the characteristic impedance of the transmission line was set to approximately 50Ω. Then, the manufactured connector was soldered, mounted, fixed and mounted on the substrate 14 as shown in FIG.

The electrical characteristics of the connector connected to the transmission line of the board 14 and mounted were measured.
WR is 1.36 at frequencies up to 6 GHz;
The insertion loss was 0.4 dB. On the other hand, FIG.
The VSWR of the conventional connector as shown in FIG.
It is 1.8 at frequencies up to z and the insertion loss is 0.3.
It was 8 dB. From this, it was found that the connector 10 has good transmission characteristics with little signal loss in connection.

On the other hand, in this configuration, when the strength of the connector in the direction of peeling off the connector from the board was measured by a tensile tester, it was 180 N.
Even when the connector 10 was mounted while being exposed to the outside, it was found that the connector 10 was not easily peeled off from the substrate surface, and had a mechanical tensile strength that had no practical problem.

Although the connector device of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and various improvements and modifications may be made without departing from the spirit of the present invention. Of course.

[0029]

As described in detail above, according to the surface mount type connector device of the present invention, it is possible to reduce transmission loss in transmitting a high frequency signal. Further, when the width d of the center conductor of the connector device and the width D of the gap between the metal cases of the connector device satisfy Expressions (1) and (2), transmission loss when the connector is mounted on the board surface is further reduced. Can be reduced. Further, this connector device is at a level where there is no problem with respect to the mechanical tensile strength when it is mounted on the board surface, and is extremely practical. Furthermore, the present invention can be provided as a connector device for connecting a transmission line of a glass antenna for a high-frequency signal such as an ultrashort wave, a microwave, or a millimeter wave to a coaxial cable.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a surface mount type coaxial connector which is an example of a connector device of the present invention is mounted on a substrate.

2A is a cross-sectional view of the surface-mount type coaxial connector shown in FIG. 1, and FIG. 2B is a rear view of the surface-mount type coaxial connector shown in FIG.

FIG. 3 is a plan view showing an example of a substrate on which the connector device of the present invention is mounted.

FIG. 4 is a sectional view showing another example of the connector device of the present invention.

FIG. 5A is a perspective view showing a conventional surface-mounted coaxial connector, and FIG. 5B is a cross-sectional view showing a conventional surface-mounted coaxial connector.

[Explanation of symbols]

 10, 40 Surface-mount type coaxial connector 11, 41, 52 Center conductor 12, 42 Metal case 12a Mounting and fixing surface 13, 43, 53 Insulator 14 Substrate 15 Ground conductor 16 Coplanar waveguide 16a Central conductor 17, 18 Solder 51 Outer conductor 51a, 52a Lead terminal

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koji Igawa 1150 Hazawacho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture F-term in Asahi Glass Co., Ltd. 5E077 BB08 BB12 BB22 BB31 CC26 DD01 EE06 JJ17

Claims (1)

[Claims] 1. A surface mount type connector device having a mounting and fixing surface for mounting and fixing on a substrate surface, and connecting a coaxial cable and a transmission line formed on the substrate surface. At one end, a central conductor connected to the inner conductor of the coaxial cable, and at the other end, a central conductor connected to the conductor of the transmission line, the central conductor being inclined with respect to the substrate surface to the transmission line. A connector device, wherein a connection portion of the center conductor is inclined with respect to the placing and fixing surface so as to be connected.