Open Boundary Quad-Ridged Horn Antenna 60歲玉女一生未婚！患容貌焦慮症 拋淡出震撼彈
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
日本航空又有機長在外地過夜，執勤前違反公司規定飲酒，導致3個航班延誤18小時。（示意圖:Shutterstock/達志）
文章來自: https://www.chinatimes.com/realtimenews/20250903003764-260408
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.
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
日航機長偷喝3罐啤酒 害637名乘客延誤18小時
日本航空今天（3日）表示，日前一名機長在夏威夷停留期間違反公司規定飲酒，因身體不適無法執勤，導致一共3個航班長達18小時的延誤。
《讀賣新聞》、日本放送協會（NHK）、富士新聞網（FNN）報導，根據日航說法，該名64歲機長原定於8月28日負責從檀香山飛日本中部國際機場的航班，但在前往機場前向公司報告身體不適，進一步確認後發現他在飯店飲酒。日航隨即解除該機長勤務，緊急安排其他機師替補。
相關人士透露，該名機長表示，自己在執勤前一晚於飯店房間內獨自喝了3罐500ml啤酒。日航在29日得知情況後，立即向日本國土交通省報告。
文章來自: https://www.chinatimes.com/realtimenews/20250903003764-260408
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.