亚洲欧美第一页_禁久久精品乱码_粉嫩av一区二区三区免费野_久草精品视频

蟲蟲首頁| 資源下載| 資源專輯| 精品軟件
登錄| 注冊

您現(xiàn)在的位置是:蟲蟲下載站 > 資源下載 > 書籍 > RF Imperfections

RF Imperfections

  • 資源大?。?/b>9875 K
  • 上傳時間: 2020-06-01
  • 上傳用戶:shancjb
  • 資源積分:2 下載積分
  • 標      簽: Imperfections RF

資 源 簡 介

The unguided transmission of information using electromagnetic waves
at radio frequency (RF) is often referred to as wireless communications,
the first demonstration of which took place at the end of the 19th cen-
tury and is attributed to Hertz. The technology was, shortly thereafter,
commercialised by, amongst others, Marconi in one of the first wire-
less communication systems, i.e., wireless telegraphy. In the first half of
the 20th century the technology was developed further to enable more
than the mere transmission of Morse code. This first resulted in uni-
directional radio broadcasting and several years later also in television
broadcasting.

相 關(guān) 資 源

主站蜘蛛池模板: 色达县| 亚东县| 大名县| 和政县| 莆田市| 嘉定区| 花莲县| 中牟县| 扎鲁特旗| 扶余县| 邢台县| 延长县| 始兴县| 宁乡县| 芦山县| 美姑县| 宁波市| 毕节市| 谷城县| 梅河口市| 柳州市| 灵台县| 新兴县| 久治县| 闸北区| 桦甸市| 渑池县| 宜春市| 石家庄市| 山西省| 大悟县| 沂源县| 十堰市| 长岭县| 北辰区| 康马县| 汉源县| 龙井市| 桓台县| 伽师县| 嘉义市|