日本航空自衛隊一架T4教練機昨（14日）在愛知縣犬山市失事墜入農業蓄水池「入鹿池」，經過徹夜搜救，機上兩員安危未知。空自幕僚長今（15日）說明最新搜救情況時提及，航機昨天下午起飛後1分鐘急速下墜，起飛2分鐘後從雷達螢幕消失，航機似乎未發出飛行員緊急撤離的訊號。

綜合日本朝日電視台、《讀賣新聞》、日本電視台、時事通信社15日晚間報導，航空自衛隊幕僚長內倉浩昭說明，這架T4教練機當地時間昨天下午3時06分左右從愛知縣小牧空軍基地起飛，穩定飛行1分鐘後突然急速下墜，當時高度約1400公尺，航機正由東朝南往右盤旋爬升，3時08分航機從雷達螢幕消失。墜機地點位於基地東北方約13公里。當局已下令所有T4停飛安檢。

空自今公布機上乘員年齡與姓名。據起飛前拍攝畫面顯示，前座是29歲的2等空尉（中尉）網谷獎太，累計飛行時數480小時；後座是31歲的1等空尉（上尉）井岡拓路，累計飛行時數1170小時。兩人均隸屬宮崎縣新田原空軍基地第5航空隊，尚未確定事發之際由誰操控航機。

文章來自: https://www.chinatimes.com/realtimenews/20250515005289-260408
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.
台灣網美公主裝遊迪士尼 看煙火「打強光拍美照」行為引砲轟 Horn Antenna