JPH05242934A - High frequency connector - Google Patents

Abstract

PURPOSE:To facilitate conforming of high frequency signals at a connection point between a dielectric and a circuit base board. CONSTITUTION:In a central conductor 14, clearance between it and a frame 10 becomes smaller as it approaches a circuit substrate 13, and a tip 14A thereof is connected to a micro-strip line 13A (or coplanar line). A part of outer circumferential surface of dielectric 15 is cut off and a sectional area thereof becomes gradually smaller toward the circuit substrate 13 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency connector, and more particularly to a transmission line converting connector.

[0002]

2. Description of the Related Art As shown in FIG. 3, a high-frequency connector which has been already proposed has a frame 2 connected to a case 1 which is a ground side conductor of a transmission line, and a circuit board arranged on the case 1. A center conductor 4 connected to the signal-side conductor formed on 3 and a cylindrical shape for maintaining the characteristic impedance constant between the frame 2 and the center conductor 4 and supporting the center conductor 4. The dielectric 5 is provided.

[0003]

In such a conventional high-frequency connector, there is a large difference between the cross-sectional area of the dielectric 5 and the cross-sectional area of the circuit board 3. Therefore, when the high-frequency signal from the dielectric 5 changes its form into a transmission line such as a microstrip line or a coplanar line on the circuit board 3,
At this connection point (the connection between the dielectric 5 and the circuit board 3), the electromagnetic field distribution changes abruptly. Therefore, there is a problem that the high frequency signals cannot be matched at this connection portion.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a high-frequency connector that facilitates matching of high-frequency signals at a connection point between a dielectric and a circuit board.

[0005]

A high frequency connector of the invention according to claim 1 is connected to a frame connected to an outer conductor of a coaxial line for transmitting a high frequency signal and to an inner conductor of the coaxial line,
And a center conductor whose distance from the frame changes, and a dielectric body which maintains the distance between the center conductor and the ground,
A part of the outer peripheral surface of this dielectric is shaved off, and the cross-sectional area is reduced toward the circuit board side where a high frequency signal is transmitted.

The high frequency connector of the invention according to claim 2 is
It is characterized in that the dielectric is made of Teflon.

[0007]

As described above, according to the present invention, a part of the outer peripheral surface of the dielectric is shaved off so that the cross-sectional area is reduced toward the circuit board side. The difference in area is reduced. Therefore, the transition from the electromagnetic field distribution of the dielectric material to the electromagnetic field distribution of the microstrip line or the coplanar line of the circuit board can be performed gently, and it becomes easy to match the high frequency signal.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. 1 is a plan view showing an embodiment of a high-frequency connector according to the present invention, and FIG. 2 is a sectional view of the same high-frequency connector.
The frame 10 is connected by screws 11 to a case 12 which is a ground side conductor of the transmission line. The case 12 is connected to the ground side of a microstrip line 13A (or a coplanar line) formed on a circuit board 13 made of alumina. Further, the center conductor 14 is configured so that the distance between the center conductor 14 and the frame 10 is reduced as it approaches the circuit board 13, and its tip portion 14A is connected to the microstrip line 13A (or the coplanar line) on the circuit board 13. It has become.

On the other hand, the dielectric 15 holding the central conductor 14
Is made of Teflon and has a substantially cylindrical shape. That is, a part of the outer peripheral surface of the dielectric 15 is cut away as shown in FIG. 2, and the cross-sectional area of the dielectric 15 is gradually reduced toward the circuit board 13 side. Therefore, the cross-sectional area at the connection point between the dielectric 15 and the circuit board 13 is not so different from the conventional one, and therefore the electromagnetic field distribution of the dielectric 15 causes the microstrip line 13A (or the coplanar line) of the circuit board 13 to be different. It is possible to make a gradual transition to the electromagnetic field distribution of the line. Further, the characteristic impedance that decreases as the center conductor 14 approaches the frame 10 is made constant by scraping off a part of the dielectric 15 so that the air layer 16 exists between the center conductor 14 and the case 12. It becomes possible.

[0010]

As described above, according to the high frequency connector of the present invention, a part of the outer peripheral surface of the dielectric body that holds the space between the central conductor and the ground is scraped off and cut toward the circuit board side. Since it is configured to reduce the area, the difference in the cross-sectional area at the connection point between the dielectric and the circuit board is reduced, and this reduces the electromagnetic field distribution of the dielectric from that of the microstrip line or coplanar line It has become possible to make a smooth transition to. Therefore,
The excellent effect that the high frequency signal can be easily matched at the connection point between the dielectric and the circuit board is achieved.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a high frequency connector according to the present invention.

FIG. 2 is a sectional view of the high-frequency connector.

FIG. 3 is a cross-sectional view showing an example of a conventional high frequency connector.

[Explanation of symbols]

 10 frame 12 case 13 circuit board 14 center conductor 15 dielectric

Claims (2)

[Claims] 1. A frame connected to an outer conductor of a coaxial line that transmits a high-frequency signal, and a center conductor that is connected to an inner conductor of the coaxial line and has a variable distance from the frame.
A dielectric for maintaining a space between the central conductor and the ground is provided, and a part of the outer peripheral surface of the dielectric is shaved off so that the cross-sectional area is toward the circuit board side where a high frequency signal is transmitted. A high frequency connector characterized by being configured to reduce. 2. The high frequency connector according to claim 1, wherein the dielectric is made of Teflon.