JP2000188497A - High-frequency power leakage prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a high-frequency power from leaking by dividing a circuit that is arranged on a dielectric substrate where a high-frequency circuit is arranged with a metal wall, covering the upper part with a metal lid, and covering the upper surface of the metal wall with a small shielding metal piece inside the lid. SOLUTION: When high-frequency parts such as a coil for easily radiating high-frequency electronic waves are arranged, for example, at a cell 42, a high- frequency electronic wave leaks to the inside of other adjacent cells 41 and 43 if only a metal wall 2 and a lid 3 are used. Therefore, by shielding the cell 42 where a high-frequency power in that high-frequency parts such as a coil for easily radiating high-frequency electronic waves are arranged may leak with a small shielding metal piece 6 in advance and increasing the degree of shielding between the wall surfaces of the metal wall 2 that is adjacent to the cell 42, the leakage of high-frequency power to the adjacent cells 41 and 43 can be reduced or prevented. In this manner, the layout of a circuit on the substrate, an electric circuit, and the like need not be changed when the high-frequency power leaks on the high-frequency circuit of a dielectric substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency power leakage prevention device for preventing high-frequency power from leaking in a device using a high frequency, for example, a radio communication device or a radio receiver.

[0002]

2. Description of the Related Art In a device using a high frequency, a high-frequency signal transmitted inside the device not only is transmitted through a signal line but also emits a radio wave at the same time. The radiation of this radio wave causes various inconvenient operations due to the interference of radio waves in the circuit of the device using high frequency, or causes radio wave interference to external field devices. A high-frequency power leakage prevention device for preventing leakage is provided inside the device.

A high-frequency power leakage prevention device widely used in conventional high-frequency devices generally has the structure shown in FIG. In FIG. 3, reference numeral 1 denotes a dielectric substrate of a device using a high frequency. Reference numeral 2 denotes a metal wall provided on the dielectric substrate 1, which divides a high-frequency circuit of the dielectric substrate 1 into a plurality of cells 41, 42, and 43. Reference numeral 3 denotes a metal cover that covers the upper part of the metal wall 2. The high-frequency power leakage prevention device includes a metal wall 2 provided on a dielectric substrate 1 and a metal cover 3 covering the same, and the metal cover 3 is configured to transmit high-frequency power by the metal cover 3 and the metal wall 2. Each enclosed cell 4
It is configured to prevent radiation to the outside of the spaces 1, 42 and 43.

In the high-frequency power leakage prevention device having such a configuration, the metal walls 2 on the dielectric substrate 1 are usually manufactured by sheet metal processing at a low manufacturing cost.
It was difficult to prevent a minute gap from being formed between the 2, 43 metal walls 2 and the lid 3 that integrally covers the metal walls 2. Further, in order to eliminate the minute gap, the structure of the metal wall 2 must be largely changed, and a great increase in cost cannot be avoided. FIG. 4 shows an example in which a high-frequency component such as a coil that easily emits high-frequency power is arranged in the cell of the high-frequency power leakage prevention device of FIG. In FIG. 4, reference numeral 2 denotes a metal wall provided on the electric substrate 1, and reference numeral 3 denotes a metal cover that covers the metal wall 2. 41, 42 and 43 are metal walls 2
Each cell is separated inside the lid 3 by the following. Reference numeral 51 denotes a coil mounted inside the cell 41, and 52 denotes a coil mounted inside the cell.

When the high-frequency components as shown in FIG. 4 are mounted inside the high-frequency power leakage prevention device, the coils 51 and 52 mounted inside the cells 41 and 42 separated inside the lid 3 are removed. There is a disadvantage that high-frequency power leaks from components such as coils to adjacent cells through a minute gap between the metal wall 2 and the lid 3. When high-frequency power leakage occurs in adjacent cells as described above, in order to suppress the leakage, it is necessary to change the layout of the circuit on the dielectric substrate so that the power is hardly radiated. . For this purpose, it is necessary to redesign to change the configuration of the high frequency circuit, which requires cost and time. When high-frequency power leakage occurs, such redesign has to be performed many times until the high-frequency power leakage value reaches the required performance.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem of the above-mentioned conventional high-frequency power leakage prevention device by mounting simple components when high-frequency power leakage occurs. An object of the present invention is to realize a high-frequency power leakage prevention device that does not require redesign to change the layout of a circuit configuration of a dielectric substrate.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a metal wall for dividing a circuit arranged on a dielectric substrate on which a high-frequency circuit is arranged, and an upper part of the metal wall. A cell constituted by a covering metal lid, and a shielding metal piece covering an upper portion of a metal wall inside the metal lid of the cell;
This realizes a high-frequency power leakage prevention device. According to the present invention, when a high-frequency electric wave is leaked from a component that generates high-frequency power on a dielectric substrate, the high-frequency electric wave is divided by a metal wall configured on the dielectric substrate and a metal cover that covers an upper portion thereof. In addition, between two or more cells, the leaked high-frequency power is reduced by the shielding effect of the shielding metal pieces. Therefore, even when high-frequency power is leaked, it is not necessary to redesign the layout of the circuit configuration of the dielectric substrate. Further, it is possible to change the mode of electromagnetic wave radiation by making a hole in the shielding metal piece or to provide a projection or the like on the back surface of the shielding metal piece, thereby further reducing the leaked high-frequency power.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of an embodiment of a high-frequency power leakage prevention device according to the present invention before a shield metal piece is attached.
FIG. 2 is a view showing the configuration of an embodiment of the high frequency power leakage prevention device of the present invention when a small shielding metal piece is mounted. 1 and 2, reference numeral 1 denotes a dielectric substrate on which a circuit that generates high-frequency power is mounted, and 2 denotes a metal wall that holds a GND potential that shields high-frequency power from affecting adjacent circuits. is there. Reference numeral 3 denotes a metal lid that forms a closed space together with a metal wall holding the GND potential in order to prevent high-frequency power from radiating from the dielectric substrate to the external space.

The high-frequency power leakage prevention device includes a metal wall 2 provided on a dielectric substrate 1 and a metal cover 3 covering the metal wall 2.
And radiated to the outside of the space of each cell 41, 42, 43 surrounded by the metal wall 2.
Reference numeral 6 denotes a small shielding metal piece that covers the upper part of the cell. The shielding metal pieces 6 increase the degree of shielding between the metal walls 2 adjacent to each cell, thereby reducing the degree of high-frequency power leakage to adjacent cells.

2 and 3, when there is no shielding metal piece 6, the metal wall 2 and the metal lid 3 are only partially in a conductive state, and the metal wall 2 and the metal lid 3 And a high-frequency power inside the cell formed by the metal wall 2 and the lid 3 cannot be completely shielded. Therefore, for example, when a high-frequency component such as a coil that easily emits high-frequency radio waves is arranged in the cell 42, only the metal wall 2 and the lid 3 are formed by the metal wall 2 and the lid 3 as in the conventional device. High-frequency radio waves leak into the inside of the other adjacent cells 41 and 43.

For this reason, the cell 42 in which high-frequency power is likely to leak in which a high-frequency component such as a coil that easily emits high-frequency radio waves is disposed is shielded by the shielding metal piece 6 in advance, so that the cell 42 is protected. By increasing the degree of shielding between adjacent metal walls 2, leakage of high-frequency power to adjacent cells 41 and 43 can be reduced or prevented. Also, if leakage of high-frequency power is recognized from other cells that are not shielded by the shielding metal pieces 6 even if shielding is performed in advance by the shielding metal pieces 6, the cell in which leakage of high-frequency power further occurs Against
Further, by shielding with the shielding metal pieces 6, the degree of shielding between the metal wall 2 adjacent to the cell where the leakage of the high-frequency power is recognized is increased, and the leakage of the high-frequency power to the adjacent cell is reduced. Can be prevented.

As described above, according to the present invention, even when high-frequency power leakage occurs on a high-frequency circuit of a dielectric substrate, it is possible to shield the circuit without changing the circuit layout, electric circuit, etc. on the substrate. Can be. Note that the shielding metal pieces used in the present invention are not limited to those in the above-described embodiment, and holes in the shielding metal pieces, or by providing projections or the like on the back surface of the shielding metal pieces, reduce the radiation of electromagnetic waves. Various modifications are conceivable, such as using a shielding metal piece that can change the mode and further reduce the leaked high-frequency power.

[0013]

As is apparent from the above description, the present invention relates to a metal wall for dividing a circuit arranged on a dielectric substrate on which a high-frequency circuit is arranged, a metal cover for covering an upper part of the metal wall, and And a shielding metal piece that covers the upper portion of the metal wall inside the lid inside the cell, thereby realizing a high-frequency power leakage prevention device. According to the present invention, high-frequency power leaked on the high-frequency circuit of the dielectric substrate can be shielded without changing the circuit layout on the substrate, the electric circuit, and the like. It can be easily shielded.

Therefore, the high-frequency power leakage prevention device of the present invention has the following effects. 1. Unlike a conventional high-frequency power leakage prevention device, when high-frequency power leakage occurs, it is not necessary to redesign the layout of the circuit configuration of the dielectric substrate, so that the design cost can be reduced. 2. Even if high-frequency power leakage occurs, there is no need to redesign the circuit configuration layout of the dielectric substrate.
The module can be designed in a short time as compared with the conventional high frequency power leakage prevention device.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a high-frequency power leakage prevention device according to the present invention before a shielding metal piece is attached.

FIG. 2 is a configuration diagram of one embodiment of the high-frequency power leakage prevention device of the present invention when a small shielding metal piece is mounted.

FIG. 3 shows an example of a high-frequency power leakage prevention device widely used in conventional high-frequency devices.

4 shows an example in which high-frequency components such as coils that easily emit high-frequency power are arranged in the high-frequency power leakage prevention device of FIG.

[Explanation of symbols]

1 .... substrate of electric body of equipment using high frequency, 2.
..Metal walls provided on electric circuit board 1, 3 ...
Metal covers for covering the metal wall 2, 41, 42, 43... Cells separated inside the lid 3 by the metal wall 2, 51.
Coil mounted inside cell 41, 52... Coil mounted inside cell 42, 6.

Claims (5)

[Claims] 1. A cell comprising: a metal wall for dividing a circuit disposed on a dielectric substrate on which a high-frequency circuit is disposed; a metal cover for covering an upper part of the metal wall; A high-frequency power leakage prevention device comprising a shielding metal piece that covers an upper part of a metal wall inside a lid. 2. A cell comprising: a metal wall for dividing a circuit disposed on a dielectric substrate on which a high-frequency circuit is disposed; and a metal lid covering an upper part of the metal wall; and a cell disposed in the cell. A high-frequency power leakage prevention device comprising: a shielding metal piece that covers an upper portion of a metal wall inside a metal lid of a cell, the module that generates the generated high frequency. 3. The high-frequency power leakage prevention device according to claim 1, wherein the shielding metal piece that covers the upper portion of the metal wall inside the metal lid of the cell is easily detachable. 4. A high-frequency power leakage prevention device according to claim 1, wherein a hole is made in said shielding metal piece to change the mode of electromagnetic wave radiation to reduce high-frequency power leakage. 5. The high-frequency power leakage prevention device according to claim 1, wherein a projection or the like is provided on the back surface of the shielding metal piece to change the mode of electromagnetic wave radiation to reduce high-frequency power leakage. apparatus.