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深圳pcb打样在电镀上的具体操作【汇合】

2018-08-17

电镀精加工可以为小型部件提供光滑的安装表面,并且可以提供长期保护以防止铜变质。一些饰面还保护作为深圳pcb打样多层pcbs中不同电路层之间的电连接的电镀通孔(PTS)。

 

不幸的是,大多数深圳pcb打样成品都有价格,因为大多数增加插入损耗在一定程度上,这取决于频率和其他因素,包括基板的厚度,传输线技术的选择,以及电路的布局以及它如何受到光洁度的影响。


深圳pcb打样在电镀上的具体操作【汇合】

 

tóng shì zhǒng yōu liáng de dǎo duì chuán shū xiàn线 yóu tóng xíng chéng de diàn lǎn yǒu chā sǔn hào dàn shì P C B jiè zhì cái liào shàng de tóng bìng zǒng shì gōng zuì guāng huá zuì shuǐ píng de biǎo miàn ān zhuāng wēi xíng diàn yuán jiàn qiú zhà zhèn liè B G A ) wài huò wēi biǎo miàn ān zhuāng shù S M T ) fēng zhuāng zhōng de xiē diàn jīng jiā gōng wéi xiǎo xíng jiàn gōng guāng huá de ān zhuāng biǎo miàn bìng qiě gōng cháng bǎo fáng zhǐ tóng biàn zhì xiē shì miàn hái bǎo zuò wéi duō céng P C B s zhōng tóng diàn céng zhī jiān de diàn lián jiē de diàn tōng kǒng P T S ) 。 xìng de shì duō shù P C B chéng pǐn dōu yǒu jià yīn wèi duō shù zēng jiā chā sǔn hào zài dìng chéng shàng zhè jué pín yīn bāo kuò bǎn de hòu chuán shū xiàn线 shù de xuǎn diàn de shòu dào guāng jié de yǐng xiǎng

Most plated PCB finishes are less conductive than the copper conductors formed on the PCB’s dielectric material, and will suffer more loss than copper, especially at higher frequencies. The exception is silver, an excellent conductor, which is also expensive and usually applied in a very thin layer as a finish. PCB conductor losses are frequency dependent mostly due to the manner in which RF current uses a conductor. At lower frequencies, the RF current will use more of the conductor. At higher frequencies, the RF current tends to flow along the surface of the conductor, using only the outside skin of the conductor. Conductor loss rises as the RF current uses less of the conductor, and because of these skin effects at higher frequencies, plated finishes can have greater impact on PCB insertion loss at higher frequencies.

大多数镀深圳pcb打样成品比在pcb的介电材料上形成的铜导体导电性差,并且比铜的损耗更大,特别是在较高的频率下。例外的是银,一种优良的导体,它也是昂贵的,并且通常应用在非常薄的层中作为抛光。Pcb导体损耗频率依赖性主要是由于RF电流使用导体的方式。

 

在较低的频率下,RF电流将使用更多的导体。在更高的频率下,RF电流趋向于沿着导体表面流动,仅使用导体的外部皮肤。当RF电流使用较少的导体时,导体损耗上升,并且由于这些在较高频率下的皮肤效应,在较高的频率下,镀覆精可以对深圳pcb打样插入损耗有更大的影响。

 

相关阅读:深圳pcb打样成品在宽带损耗方面不同【汇合】


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