JPH0427156Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a terminal with a filter used when mounting high frequency functional devices such as those in the microwave band, and is particularly applicable as a terminal for power input or control signal input. This invention relates to a terminal equipped with a high-frequency rejection filter.

[Prior Art] A connection between a power supply lead or a control signal lead of a functional device that handles high frequency signals such as a microwave band and an external circuit is configured as shown in FIG. 3, for example. That is, the lead 23 for power input or control signal input of the high-frequency functional device 21 mounted on the casing 22 passes through a hole drilled in the casing 22 and is connected to the external circuit by the lead wire 24 or wiring pattern. connected to. This lead 23
In some cases, a high frequency signal operating inside the high frequency functional device 21 may leak.
This leakage may impede the functionality of the device.

In such cases, conventionally, as shown in Figure 3,
A method has been used to prevent leakage by installing a high frequency capacitor 25 at the end of a lead wire or wiring pattern.

[Problems to be solved] The above-mentioned method of installing a capacitor at the end of the lead wire or wiring pattern is recommended when the frequency is high, when you want to minimize leakage, or because the control signal is extremely high-speed, you need a capacitor with sufficient capacitance. There was a problem that if it was not possible to connect, sufficient leakage prevention effect could not be obtained.

The present invention has been developed in view of the above-mentioned problems, and aims to provide a terminal with a high-frequency blocking filter that improves the blocking effect against high frequencies and is small and lightweight.

[Means for solving the problem] In order to achieve the above object, the terminal with a high-frequency blocking filter of the present invention includes a metal cylinder having a flange, and a radio wave absorbing device provided at the upper and lower parts of the flange of the cylinder. It is composed of a cylindrical block made of a body and an electrically insulating material covering the outer peripheral surface of the block provided on the upper part of the flange part.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

The drawings relate to a terminal with a high-frequency blocking filter according to the present embodiment, and FIGS. 1A and 1B show a plan view and a cutaway view of a main part thereof, and FIG. 2 shows a sectional view of the terminal in use.

In these drawings, reference numeral 1 denotes a metal cylindrical body having a flange portion 2, the surface of which has been subjected to a surface treatment that allows soldering. 3 and 4 are blocks in which radio wave absorbers are formed into cylindrical shapes, one block 3 is provided on the upper part of the flange part 2 of the cylindrical body 1, and the other block 4 is provided on the cylindrical body 1 at the lower part of the flange part 2. It is installed. Further, the outer peripheral surface of one block 3 is covered with an electrically insulating material 5. Furthermore, a ring-shaped dielectric 6 is attached to the outside of the block 3 on the upper surface of the flange portion of the cylindrical body 1.

Next, an example of use when mounting a high frequency device will be explained with reference to FIG.

Reference numeral 11 denotes a high frequency device, and a lead 12 for power supply or control signals is provided. Reference numeral 13 denotes a housing or the like for mounting the high-frequency device 11, and has a hole 14 formed therein for guiding the lead 12 into the housing or the like, and a terminal is attached to this hole 14. and,
Leads 12 of the high frequency device 11 are guided into the interior of a housing 13 through the center hole of the cylindrical body 1 and block 3 of the terminal. In this case, the leading end neck portion of the lead 12 is connected to the lower end of the cylindrical body 1 by a solder 15, and the leading end is further connected to a line 17 of a board 16 or the like.

Therefore, from the high frequency device 11 to the lead 1
The high frequency signal leaking through the block 2 is first absorbed by the block 3 made of a radio wave absorber attached to the hole 14 of the housing 13. Furthermore, the leaked power is grounded to the casing 13 at high frequency by a capacitor constituted by the flange portion 2 of the cylindrical body 1, the casing 13, and the dielectric 6. Furthermore, the leaked signal is absorbed by block 4 made of a radio wave absorber.
In this way, leakage of the high frequency signal propagated to the connection line 17 can be made extremely small. The terminals mentioned above are suitable for high frequency i.e. VHF
It is particularly effective in the microwave band or microwave band.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, a cylindrical body 1 having a flange portion,
Furthermore, the blocks 3 and 4 made of radio wave absorbers can also have a shape other than a cylindrical shape.

[Effects of the invention] As described above, according to the invention, leakage of high-frequency signals from high-frequency devices can be reliably prevented, and the structure of the terminal is simple, compact, and lightweight. have

[Brief explanation of drawings]

1 and 2 relate to an embodiment of the present invention,
Figure 1a is a plan view, Figure 1b is a cutaway view of the main part, Figure 2
The figure shows a sectional view of the device in use, and FIG. 3 shows an explanatory view of a conventional example. 1... Cylindrical body, 2... Flange part, 3, 4...
Block, 5... electrical insulating material, 6... dielectric material.

Claims (1)

[Scope of utility model registration request] A cylindrical block consisting of a metal cylinder having a flange, a radio wave absorber provided at the upper and lower parts of the flange of the cylinder, and an electric wire covering the outer peripheral surface of the block provided at the upper part of the flange. A terminal with a high-frequency blocking filter, characterized by being made of an insulating material.