Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
A340-600這款飛機從機頭到機尾全長75公尺，是僅次於波音747-8的第二長的客機。（示意圖：shutterstock／達志）
文章來自: https://www.chinatimes.com/realtimenews/20240706003664-260408
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.
影》這飛機廁所位置太獨特 乘客拍片網瘋傳
抖音（TikTok）近日流傳了一支影片，驚嘆德國漢莎航空（Lufthansa）班機上的廁所位置在「樓下」，引起網友熱議，這支影片觀看次數已經超過500萬次，主要是因為這架空中巴士A340-600不是雙層客機，所以這樣的空間配置讓世界各地的網友們感到驚奇。
網友@downielive上傳的影片中表示：「我從來沒有在飛機上見過這樣的設計。」然後他邊走邊說道：「這是一架普通的客機，不是雙層客機……但廁所在樓下。」
隨後他將鏡頭指向一個向下樓梯，通往一個有5間廁所的區域。並打開其中一扇門展示了雖然位置奇特，但仍然是標準大小的飛機廁所。
他後來透露，他乘坐的是漢莎航空的一架Airbus A340-600，正如他所發現的那樣，這些飛機的廁所是設置在貨艙中，位於客艙中段，並設有防止乘客摔下樓梯的柵欄設計，是目前唯一一款將廁所設計「在樓下」的客機。
有網友肯定道：「讚……我不想在座位附近聞到廁所的氣味！！」，還有網友開黃腔說，這樣隱秘的浴室位置提供了加入「高空俱樂部」（mile-high club）的絕佳機會。Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
文章來自: https://www.chinatimes.com/realtimenews/20240706003664-260408
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.
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