制作一个简单的2.425GHzGHz螺旋天线.pdfVIP

制作一个简单的 ISM 无线电频段的 2.425GHz 螺旋天线 Septem How to Make a Simple 2.425GHz Helical Aerial for Wireless ISM Band Devices 怎样制作一个简单的ISM无线电频段的 2.425GHz螺旋天线 【ISM（Industry Science Medical）频段即工业科学医疗频段，该频段在美国 不受 FCC（美国联邦通信委员会）限制，属于工业自由辐射频段，频段范围为 2.4GHz～2.4835GHz。——译者注】 Introduction 引言 As some of the readers may know, an effort by members of the Canberra Linux Users Group has been launched to set up a Canberra-wide wireless LAN. This amateur experiments existence is largely due to the acquisition of many cut-price old style Lucent WaveLAN cards being superseded by the IEEE 802.11 standard cards. The cards were cheap but the tile antennas that came with them are no good for long haul links of more than several hundred metres. On top of this, commercial aerials that can do the job are expensive, can get rather large and are ugly, especially the conifers. My Mum would not want one on her roof. 正如很多读者都知道的，由于堪培拉 Linux 用户集团的成员不懈努力的结 果，已经创办起了堪培拉宽带局域网。这个业余实验的存在很大程度上依赖于 廉价的旧型号朗讯 WaveLAN 卡被 IEEE 802.11 标准卡所取代获得的。卡是便 宜，但是瓦片天线（贴片天线）也随之而来，而这些贴片天线不能胜任数百米 之外的持久连接。除此之外，市场卖的天线倒是能担当这项工作，但是它们又 大又难看，特别是抛物面栅格天线。我妈妈可不想在她的屋顶放上一个。 Consequently, there is no reason why this aerial couldnt also be used with any other equipment that requires a broad bandwidth in the 2.425GHz band such as the new 802.11 wireless network cards or video transmitters. If anyone does use the aerial with these bits of ber，2009 1 制作一个简单的 ISM 无线电频段的 2.425GHz 螺旋天线 September，2009 2 equipment, please let me know! 所以，没有理由不把这个天线用于那些需要使用 2.425GHz 波段宽带的任何 设备，例如新生产的 802.11 网络卡或视频发射机等。如果有人在这些设备用了 这个天线，一定要告诉我哦！ The idea behind this aerial was for anyone to be able to make their own aerial for point to point links, and do it cheaply. The criteria are cost effectiveness, ease of construction and durability. Durability is important as you dont want wind, beak cleaning magpi