Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
行動電源若發燙膨脹有起火風險，應立即停止使用，用大量清水冷卻。（示意圖：Shutterstock/達志)
本篇文章引用自此: https://www.chinatimes.com/realtimenews/20250825003112-260408
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.
行動電源膨脹發燙 飯店客塞進冰箱冷卻 險釀火災
日本北海道一家商務飯店昨天傳出一起客房火警，還出動消防隊。起因是一名住客發現充電的行動電源出現發燙膨脹現象，於是把它放進客房冰箱冷卻，不久冰箱開始冒煙，濃煙竄出客房，飯店急忙報警，所幸僅行動電源燒熔，未釀成大禍。
根據朝日電視、北海道新聞UHB、北海道STV新聞等媒體報導，事故發生在留萌市開運町一家商務飯店。昨上午 7 時 過後左右，飯店通報2樓走廊有白煙。消防人員到場時，煙霧已逐漸消散，無需灑水處理，僅確認房內一個行動電源部分燒熔。
40多歲男性住客表示，他在房間內為行動電源充電時，發現電池膨脹變燙，於是將電池放入冰箱降溫。數分鐘後，冰箱內傳出「砰」的聲音，他嚇得打開冰箱，頓時整個房間都是煙。其他住客發現後通報飯店人員。
本篇文章引用自此: https://www.chinatimes.com/realtimenews/20250825003112-260408
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.