Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
在陸地旅遊很正常普通的行為，到了郵輪旅遊可能並不適當，甚至列入禁止事項。（示意圖：shutterstock／達志）
本文出自: https://www.chinatimes.com/realtimenews/20250202002593-260408
The Log Periodic Antenna as known as LPDA is a wideband directional antenna that provides gain and directivity combined over a wide band of frequencies.
Both Log-Periodic Antennas and Yagi antennas are high gain directional antennas. The main difference between these antennas is that Log-Periodic Antennas support wider frequency bandwidths and are physically much larger than Yagi antennas.
The log-periodic dipole array typical VSWR is 2:1 and operates over a much wider bandwidth and will have a lower gain for an equivalent number of elements.
With this level of performance, it is ideal for many applications, although a log-periodic antenna will be much larger than a Yagi of an equivalent gain.
不是「炒飯」！搭郵輪陽台1事NG 一堆人不知
搭乘郵輪有些與陸地旅遊不同的禁忌行為，有的遭禁很容易理解，也有很普通的日常之舉入了NG之列。全球知名嘉年華遊輪公司代言人最近發聲宣導，除了吸菸、性行為，在艙房陽台還有一件日常小事嚴格禁止，不僅有安全風險且有礙觀瞻，但很多人不知道，船公司只好出動品牌大使加強宣導。
英國《每日郵報》日前報導，擔任嘉年華遊輪公司（Carnival）品牌大使希爾德（John Heald）近日提醒旅客，艙房陽台「不得晾曬衣物」。旅遊網紅賈德森（Jayson Judson）引述宣導，嘉年華公司已明令禁止乘客在艙房陽台懸掛晾衣繩，連晾衣服也不允許，「出於整體環境考量，船員會予以移除，因為實在很難看」。他補充，嘉年華郵輪為乘客提供自助洗衣機與烘衣機，艙房內也有可供吊掛晾衣的位置。嘉年華官網發布相同警告內容，「出於安全考量，艙房陽台請勿吊掛衣物、毛巾」。
網路最近流傳兩艘郵輪照片顯示乘客艙房陽台掛著曬衣繩，繩上掛著T恤、內衣等衣物。品牌大使希爾德在臉書答覆網友提問「能否在艙房陽台晾衣」時斬釘截鐵表示：「不能，基於極為重要的安全緣由，艙房陽台絕對不許晾衣。據我所知，房務員上午進入客艙打掃時會全部收下來。」
本文出自: https://www.chinatimes.com/realtimenews/20250202002593-260408
The Log Periodic Antenna as known as LPDA is a wideband directional antenna that provides gain and directivity combined over a wide band of frequencies.
Both Log-Periodic Antennas and Yagi antennas are high gain directional antennas. The main difference between these antennas is that Log-Periodic Antennas support wider frequency bandwidths and are physically much larger than Yagi antennas.
The log-periodic dipole array typical VSWR is 2:1 and operates over a much wider bandwidth and will have a lower gain for an equivalent number of elements.
With this level of performance, it is ideal for many applications, although a log-periodic antenna will be much larger than a Yagi of an equivalent gain.