PCB資源

深圳pcb打樣在電鍍上的具體操作【匯合】

2018-08-17

電鍍精加工可以為小型部件提供光滑的安裝表面,并且可以提供長(zhǎng)期保護(hù)以防止銅變質(zhì)。一些飾面還保護(hù)作為深圳pcb打樣多層pcbs中不同電路層之間的電連接的電鍍通孔(PTS)。

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不幸的是,大多數(shù)深圳pcb打樣成品都有價(jià)格,因?yàn)榇蠖鄶?shù)增加插入損耗在一定程度上,這取決于頻率和其他因素,包括基板的厚度,傳輸線技術(shù)的選擇,以及電路的布局以及它如何受到光潔度的影響。


深圳pcb打樣在電鍍上的具體操作【匯合】

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tóng shì zhǒng yōu優(yōu) liáng de dǎo導(dǎo) duì對(duì) chuán shū xiàn yóu tóng xíng chéng de diàn lǎn yǒu chā sǔn hào 。 dàn shì P C B jiè zhì質(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術(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長(zhǎng) bǎo 護(hù) fáng zhǐ tóng biàn zhì質(zhì) 。 xiē shì miàn hái bǎo 護(hù) 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數(shù) P C B chéng pǐn dōu yǒu jià價(jià) , yīn wèi duō shù數(shù) zēng jiā chā sǔn hào zài dìng chéng shàng , zhè jué pín yīn , bāo kuò bǎn de hòu chuán shū xiàn shù術(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.

大多數(shù)鍍深圳pcb打樣成品比在pcb的介電材料上形成的銅導(dǎo)體導(dǎo)電性差,并且比銅的損耗更大,特別是在較高的頻率下。例外的是銀,一種優(yōu)良的導(dǎo)體,它也是昂貴的,并且通常應(yīng)用在非常薄的層中作為拋光。Pcb導(dǎo)體損耗頻率依賴性主要是由于RF電流使用導(dǎo)體的方式。

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在較低的頻率下,RF電流將使用更多的導(dǎo)體。在更高的頻率下,RF電流趨向于沿著導(dǎo)體表面流動(dòng),僅使用導(dǎo)體的外部皮膚。當(dāng)RF電流使用較少的導(dǎo)體時(shí),導(dǎo)體損耗上升,并且由于這些在較高頻率下的皮膚效應(yīng),在較高的頻率下,鍍覆精可以對(duì)深圳pcb打樣插入損耗有更大的影響。

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相關(guān)閱讀:深圳pcb打樣成品在寬帶損耗方面不同【匯合】