WO2003052769A2

WO2003052769A2 - Element suppressing electromagnetic field

Info

Publication number: WO2003052769A2
Application number: PCT/PL2002/000104
Authority: WO
Inventors: Andrzej Roman Skowronski
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-12-19
Filing date: 2002-12-10
Publication date: 2003-06-26
Anticipated expiration: 2004-06-19
Also published as: WO2003052769A3; WO2003052769B1; PL203856B1; PL351274A1; AU2002351539A8; AU2002351539A1

Abstract

The element suppressing electromagnetic field contains electric wire, or electric wires (3, 4) passing through the suppressing chamber (1), filled with liquid (2), most advantageously water. The walls of suppressing chamber (1) are made with conducting electric current material and are connected with ground (5). Walls of suppressing chamber (1) are located between the plates (7) made of materials conducting electric current and they separate environment (II). Internal surface of opposite walls of suppressing chamber (1) has a gasket (6)

Description

Element suppressing electromagnetic field

This invention refers to the element suppressing electromagnetic field and can be applied in electronic systems and for separating one environment from another. It works particularly well in frequencies above 1 GHz.

Known are the elements suppressing the electromagnetic field using a cylinder shape with ferrite core, through which an electric wire passes and is called a little pearl. The electric wire can be simply straight or coiled. In the electronic systems the wires used for this purpose are impedance coils.

Known elements posses the following feature that they allow suppression within the range 6-18 dB. Proportionally greater suppression can ensure the serial connection of these elements.

Disadvantage of the known elements suppressing the electromagnetic field is the necessity of using many elements in order to increase the suppression what decreases the quality of electronic systems and increases labor consumption. More over known elements are unreliable for high currents.

Essence of this invention consists in that suppressing chamber is filled with liquid, most advantageously with water. Walls of suppressing chamber are made of material conducting electric current and they are connected to ground. The walls of suppressing chamber are located between plates made of materials conducting electric current and these plates separate environment, in which there is electromagnetic field from suppressed environment. Internal surface of opposite walls of suppressing chamber has a gasket.

In solution according to the invention simple element ensures high and effective suppression, especially within the range of high currents above 10 A.

Subject of invention is presented on a sample at the picture in which fig 1. presents suppressing element in the cross-section, before electric wires, fig. 2 presents relation of suppressing and frequency of elements on fig. 1, and fig. 3 shows the suppressing element separating two environments.

Element presented on fig. 1 is suppressing chamber I in the shape of cubic made from material conducting electric current for example cooper. Across the chamber I is a driven wire, made the best from cooper, or a few wires, as it was presented on fig 1. In this way the chamber has at one side enter wires 3 and at the opposite side exit wires 4. They are separated from walls of suppressing chamber I by the gasket, which does not conduct electric current. One of the suppressing chamber 1 walls is electrically connected to the ground 5. The suppressing chamber 1 is filled with the liquid 2, water and its shape can be of cubic, cuboid or especially cylinder. Electric wires in suppressing chamber 1 could be straight, as was shown on fig 1, or in shape of coil. Through the enter wires 3 flows electric current of high frequency with constant component I. This element is a four-terminal network. Its input are enter wires 3 and ground 5 and its output is exit wires 4 and ground 5. High frequency current is suppressed in conducting liquid 2. So in exit wires 4 is available only constant component I. In the case when the electric wire in chamber 1 has shape of coil there is a longer way of suppressing what causes that suppression is higher and shifts towards the range of lower frequency.

As it was shown on fig 2 for the cubic with the length of base_3 cm and straight electric wires the suppression increases significantly for frequency 10 GHz and is within the range of 60-100dB and depends on the dimensions of suppressing chamber 1.

As it was presented on fig 3 environment I in which there is the electromagnetic field is separated from suppressed environment II by suppressing environment III. Metal plates 7 or very strong electromagnetic field divide environment II and environment I. In environment III there is suppressing element, which is the suppressing chamber 1 made of material no conducting electric current, for example plastic.

Through the chamber passes the electric wire, which could be straight or in the shape of coil. Suppressing chamber j_ is filled with liquid 2, usually distillated water. Internal surface of opposite walls of suppressing chamber J_ has a gasket 6.

High frequency current passing through the environment I by the exit wires_3 in suppressing liquid 2 disappears and by the exits wires 3 flows only constant component of the current.

Claims

Patent claims

1. The element suppressing electromagnetic field containing electric wire, or electric wires, passing through suppressing chamber, characterized in that suppressing chamber (J is filled with liquid (2), most advantageously with water.

2. The element according to claim 1, characterized in that the walls of suppressing chamber I ) are made of conducting electric current material and are connected with ground (5).

3. The element according to claim 1, characterized in that walls of suppressing chamber (j_) are located between the plates (7) and they are made of materials conducting electric current and these plates (7) separate environment (I), in which there is the electromagnetic field from suppressed environment (II).

4. The element according to claim 3 is characterized in that internal surface of opposite walls of suppressing chamber (J_) has a gasket (6).