Printed circuit boards

A technology of printed circuit boards and electromagnetic waves, which is applied in the direction of printed circuits, printed circuits, printed circuit components, etc., can solve problems such as noise interference, undesigned, or even random placement, and achieve the effect of suppressing mutual interference

Inactive Publication Date: 2007-09-26
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
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Problems solved by technology

[0004] Since the vias 122' are all connected to the ground plane with zero potential, according to electromagnetic theory, the distance between two consecutive electric fields equal to zero is half an electromagnetic wave wavelength, so the distance between two adjacent vias 122' is equal to the isolation The resonant half-wavelength of the electromagnetic wave on the ground wire 12', and the placement position of the via hole 122' on the isolated ground wire 12' is generally not designed, or even randomly placed, so when the isolated ground wire When the

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  • Printed circuit boards
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[0011] Referring to FIG. 2, a preferred embodiment of the printed circuit board of the present invention includes at least one signal layer 10 and one ground layer (not shown), and the signal layer 10 includes at least one isolated ground line 12 and two adjacent signal lines. 14. The isolated ground wire 12 is arranged between two adjacent signal wires 14 to reduce interference between the signal wires 14 . The isolated ground wire 12 is provided with a plurality of via holes 122 connected to the ground layer, and the distance between every two adjacent via holes 122 is equal, so that the resonance wavelength of the electromagnetic wave on the isolated ground wire 12 is a fixed value.

[0012] Let the distance between every two adjacent via holes 122 be L, the resonance wavelength of the electromagnetic wave on the isolated ground wire 12 is λ, the resonance frequency is F0, the speed of the electromagnetic wave in vacuum is C, and the dielectric of the printed circuit board ...

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Abstract

The disclosed PCB comprises: at least one signal layer with at least one isolative grounding line and two near signal lines, and a grounding layer. Wherein, the isolative grounding line contains some through-holes connected with the grounding layer, and the distance of two near holes enables the EM wave resonant frequency over the highest frequency of signal in the signal line. This invention can inhibit the line interference efficiently.

Description

【Technical field】 [0001] The invention relates to a printed circuit board, in particular to a printed circuit board with isolated ground wires. 【Background technique】 [0002] At present, when designing printed circuit board layout, noise interference or coupling interference between two adjacent signal lines is usually considered. Therefore, electronic engineers have designed many methods to suppress interference for such problems. Among them, setting an isolated ground line between two adjacent signal lines is a method to suppress mutual interference between signal lines. [0003] Please refer to FIG. 1, which is a partial wiring diagram of a signal layer 10' of a printed circuit board, wherein an isolated grounding line 12' is provided between two adjacent high-speed signal lines 14', which is used to reduce the voltage of the two high-speed signal lines 14. ', the isolated ground line 12' is also provided with a number of via holes 122', and is connected to the ground l...

Claims

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Application Information

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IPC IPC(8): H05K1/02H05K1/11
CPCH05K2201/09618H05K1/0237H05K1/0219H05K2201/09236
Inventor 许寿国刘建宏
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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