JPH11251778A - Structure for connecting high frequency signal between shielded cases - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit a high frequency signal between shielded cases while enhancing space efficiency by providing a through dielectric fitted to a connector fixing hole between two shielded cases secured by a securing means, and a through pin being fitted in the through dielectric. SOLUTION: Flanges 12 are provided at the opposite ends on the side face of a shielded case 10 and threaded. The shielded case 10 are abutted against a shield case 12 on the side faces thereof and tightened by means of a screw 55 and a but 56. A through dielectric 52 is fitted in a hole between the shielded cases 10, 20 and fitted with a through pin 51. The through dielectric 52 and the through pin 51 have outside diameter identical to that of a dielectric 62 and a contact pin 61 at the part being fitted in the shield case of a connector 60. Consequently, a high frequency signal can be transmitted between the shielded cases 10, 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency signal connection structure between shield cases of electronic devices and the like.

[0002]

2. Description of the Related Art First, a description will be given of a problem in connection of a high-frequency signal between shield cases. For example,
In measuring instruments such as spectrum analyzers, EMC (elec
tromagneticcompatibility) and EMI (electromagnet
ic interference) is a problem.

[0003] Here, EMC refers to electromagnetic compatibility, which means that when operating in the place where the device or system is originally installed, it is not affected by the electromagnetic environment and has no effect. This is a field of studying how to operate without causing performance degradation, malfunction, etc.

[0004] Also, EMI is electromagnetic interference.
Although electromagnetic interference is prevented by noise filters and other countermeasures, it is difficult to prevent electromagnetic radiation by itself.Electromagnetic radiation is shielded by a shield case or equipment housing to prevent external radiation. It becomes necessary.

[0005] Therefore, in a spectrum analyzer or the like that handles high-frequency signals, a printed wiring board is incorporated in a shield case for each circuit block so that no signal is emitted to the outside. Also, between each shield case,
Signals are transmitted by connecting with a cable with a connector so that signals are not radiated to the outside.

Next, the configuration and structure of a conventional high-frequency signal connection between shield cases will be described with reference to FIG. As shown in FIG. 3, one example of a conventional high-frequency signal connection between shield cases includes shield cases 10 and 20.
, Printed wiring boards 30 and 40, connectors 60 and 70
And a cable 80 with connector.

The shield case 10 and the shield case 2
Since the configuration on the 0 side is the same, one shield case 1
The 0 side will be mainly described. The printed wiring board 30 is built in the shield case 10, and the connector 60 is attached to a side surface. Then, the printed wiring board 30 in the shield case 10 is shielded by covering the lid 11.

The printed wiring board 30 forms a strip line with one GND pattern 32 and the other signal pattern 31 to form a desired characteristic impedance. Then, the GND pattern 3 of the printed wiring board 30
2 is fixed by contacting inside the shield case 10.

The connector 60 is, for example, a receptacle which is a jack with a flange, and a contact pin 61 and a dielectric 62 are inserted into holes formed in the side surface of the shield case 10. At this time, the hole processed on the side surface of the shield case 10, the contact pin 61 and the dielectric 62
A desired characteristic impedance is obtained by forming a coaxial structure.

[0010] Then, the signal pattern 31 of the printed wiring board 30 and the contact pins 61 of the connector 60 are soldered.

The shield case 10 and the shield case 20 are connected by a cable 80 with a connector to transmit a signal. In the cable with connector 80, for example, plugs are connected to both ends of the semi-rigid cable. Generally, when the frequency is in the GHz band, an SMA type connector is used, and a semi-rigid cable having a characteristic impedance of 50Ω is used.

[0012]

As described above, in a high-frequency measuring instrument, a strict shield is required for each circuit block, and a high-frequency signal between the shield cases is connected and transmitted by a cable with a connector. Because of the necessity, space efficiency is not good and the cost is often high, which is inconvenient in practical use. Accordingly, the present invention has been made in view of such a problem, and an object of the present invention is to provide a high-frequency signal connection structure between shield cases that can transmit a high-frequency signal between shield cases with a simple structure and that is space-efficient. It is in.

[0013]

That is, a first aspect of the present invention to achieve the above object is a high-frequency signal connection structure between shield cases for transmitting a high-frequency signal between the shield cases. A fixing means for abutting and fixing a side surface of the connector mounting hole, a through dielectric inserted into the connector mounting hole between the two shield cases fixed by the fixing means, A high-frequency signal connection structure between the shield cases, comprising: a through pin through which a dielectric is inserted;

A second aspect of the present invention to achieve the above object is a shield according to the first aspect of the present invention, wherein a conductive rubber is embedded in a groove around a connector mounting hole on a side surface of the shield case to perform electromagnetic shielding. High-frequency signal connection structure between cases.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in the following examples.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, one example of a high-frequency signal connection between shield cases according to the present invention includes shield cases 10 and 20, through pins 51,
It comprises a through dielectric 52, conductive rubber 54, screws 55, nuts 56, and printed wiring boards 30 and 40.

The printed wiring boards 30 and 40 are the same as the conventional ones, and the configurations of the shield case 10 and the shield case 20 are the same. Therefore, the description of the same points as in the related art will be omitted, and the points different from the related art will be mainly described.

The side surface of the shield case 10 through which signals pass is provided with a hole for inserting a dielectric so that the connector 60 can be attached, and a process for fixing the same, as in the conventional case. Also, a conductive rubber 54 is embedded by forming a groove around the hole for inserting the dielectric on one side surface of the shield case 10 or the shield case 20.

Furthermore, the shield case 10 is provided with flanges 12 at both ends of the side surface as fixing means, and is formed with a screw hole. Then, the shield case 10 and the shield case 2
The side surfaces between 0 are brought into contact with each other, and fixed by pressing with screws 55 and nuts 56.

A through-hole dielectric 52 is provided in a hole for inserting a dielectric between the shield case 10 and the shield case 20.
And the through pin 51 is inserted into the through dielectric 52. The through dielectric 52 and the through pin 51 have the same outer diameter as the dielectric 62 and the contact pin 61 in the portion of the connector 60 to be inserted into the shield case. At this time, the holes formed in the side surfaces of the shield cases 10 and 20 and the through pins 51 fitted into the through dielectric 52 have a coaxial structure, and
Has the same characteristic impedance as when the connector 60 is attached to the. Then, the signal pattern 31 of the printed wiring board 30 and the signal pattern 41 of the printed wiring board 40,
The through pins 51 are soldered.

As described above, high-frequency signals can be transmitted between the shield case 10 and the shield case 20.

When checking the characteristics of each block of each shield case, the through pins 51 are soldered, the through pins 51 and the through dielectric 52 are removed, and the screws 55 and nuts fixing the shield case are fixed. Remove 56. Then, panel connectors 60 and 70 are attached to the side surfaces of the shield cases 10 and 20 as shown in FIG. Therefore, it is also easy to connect a signal connector to each shield case and check the characteristics of each block.

[0023]

The present invention is embodied in the form described above and has the following effects. That is,
Since the shield cases can be directly contacted and connected, there is no need to use a cable with a connector, and the space efficiency is improved. Further, since the shield cases can be connected to each other in the shortest distance, there is little loss in signal transmission, and the structure has a small change in characteristic impedance. Further, since the connection of each shield case is semi-fixed, the characteristics can be easily checked for each shield case by attaching a connector to the side surface of the shield case.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a high-frequency signal connection structure between shield cases according to the present invention.

FIG. 2 is a configuration diagram in which a connector is attached to the shield case of the present invention.

FIG. 3 is a configuration diagram of a conventional high-frequency signal connection structure between shield cases.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 shield case 11 lid 12 flange 20 shield case 21 lid 22 flange 30 printed wiring board 31 signal pattern 32 GND pattern 40 printed wiring board 41 signal pattern 42 GND pattern 51 through pin 54 conductive rubber 55 screw 56 nut 60 connector 61 contact pin 70 connector 71 contact pin 72 dielectric 80 cable with connector 81 connector 82 cable

Claims (2)

[Claims] In a high-frequency signal connection structure between shield cases for transmitting a high-frequency signal between the shield cases, a connector mounting hole provided on a side surface of the shield case, and a fixing means for abutting and fixing the side surface of the connector mounting hole. And a through dielectric inserted into a connector mounting hole between the two shield cases fixed by the fixing means; and a through pin inserted through the through dielectric. High frequency signal connection structure. 2. The high-frequency signal connection structure between shield cases according to claim 1, wherein a conductive rubber is embedded in a groove around the connector mounting hole on a side surface of the shield case to perform electromagnetic shielding.