????? Coaxial cable signal with a rate of around Traverse materials (dielectric) choices have a direct relationship. It uses solid polyethylene transmission rate is 66% of the speed of light, using polyethylene foam is 78% introduction of new nitrogen implantation (nitrogen-gas-injected) dielectric is 86% As shown in figure 2. Use of this material means that the majority of all cable gas. However, as a small bubble, the density of plastic is still high, bending wire power cables can maintain the center. Twisted-pair were in the wire bonding method sometimes used for coaxial cable, the method can make it smaller, lighter, cheaper. Meanwhile, since there is no need for plugs, installation of more simple.??? Due to the bonding process does not use glue, without stripping the glue residue, and no excess of plastic. Cut with pliers, fingers will be able to separate coaxial cable. This can reach 3GHz coaxial cable can be used analog or digital video, RGB and QXGA achieve even higher resolution VGA
Limit UTP
?
??? Copper is approaching the performance of coaxial cable, really achieved? While it was not determined, but Copper is indeed a limit, and the following two conflicting factors. The first is the cut-off frequency, usually with the coaxial cable. Over the frequency, size of the cable will affect the signal wavelength. It is, therefore, with a size of the relevant factors, the higher the frequency, we must use the smaller size of the coaxial cable. Another limiting factor is the size of Traverse. High frequency, the signal transmission cable surface (skin effect), the smaller size of the Traverse greater loss.
?
同軸電纜RG6
??? 同軸電纜非常特殊，可稱得上“高頻之王”。600MHz算是雙絞線的極限了，而對(duì)于同軸電纜，這只是小意思。
??? 同軸電纜中信號(hào)的速率與導(dǎo)線周圍材料（電介質(zhì)）的選擇有直接的關(guān)系。采用固體聚乙烯的傳輸速率是光速的66%，采用泡沫聚乙烯是78%，采用新的氮?dú)庾⑷耄?/span>nitrogen-gas-injected）電介質(zhì)則是86%，如圖2所示。采用這種材料意味著線纜內(nèi)大部分都是氣體。不過(guò)由于氣泡很小，塑料的密度仍然很高，在彎曲電纜時(shí)能使導(dǎo)線保持在中心。
??? 在雙絞線中黏合導(dǎo)線的方法有時(shí)也用于同軸電纜，這種方法能使其更小、更輕、更便宜。同時(shí)，由于不用插頭，安裝也更加簡(jiǎn)單。由于黏合過(guò)程不使用膠水，剝離時(shí)沒(méi)有膠水的殘留物，也沒(méi)有多余的塑料。用鉗子剪開(kāi)后，用手就能將同軸電纜分開(kāi)。這種同軸電纜都能達(dá)到3GHz，可應(yīng)用于模擬或數(shù)字視頻、RGB和可達(dá)到QXGA甚至更高分辨率的VGA。
銅纜的極限
??? 雙絞線正在接近同軸電纜的性能，是否真能達(dá)到呢？人們雖然并不確定，但是銅纜的確有其極限，這和以下兩個(gè)相互矛盾的因素有關(guān)。
??? 首先是截止頻率，通常與同軸電纜有關(guān)。超過(guò)這個(gè)頻率，電纜的尺寸將影響信號(hào)的波長(zhǎng)。因此，這是一個(gè)與尺寸有關(guān)的因素，越高的頻率時(shí)，就要用越小尺寸的同軸電纜。
?
??? 另一個(gè)限制因素是導(dǎo)線的尺寸。高頻時(shí)，信號(hào)在導(dǎo)線表面?zhèn)鬏敚ㄚ吥w效應(yīng)），尺寸越小的導(dǎo)線產(chǎn)生的損耗越大。
雖然不懂這行，可是看你翻譯出來(lái)，覺(jué)得真厲害~
