close
300W Wideband Horn Antenna with Three Independent ...

Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)

影》地面點火測試失敗!SpaceX星艦火箭炸成巨型火球

SpaceX星艦在進行地面發動機點火測試前突然起火。(畫面擷取自SpaceX官方直播)
SpaceX星艦在進行地面發動機點火測試前突然起火。(畫面擷取自SpaceX官方直播)
字級設定:

SpaceX的「星艦」(Starship)上級火箭台灣時間週四(19日)下午1時許,在德州墨西哥灣沿岸的「星際基地」(Starbase)製造與測試設施中發生爆炸,原定進行第10次飛行測試的星艦,在進行地面發動機點火測試前突然起火,引發巨大爆炸並摧毀整具火箭,這起事故可能對SpaceX的重型火箭開發與後續登月任務造成嚴重影響。

哥倫比亞廣播公司(CBS)報導,根據監控SpaceX活動的LabPadre公司發布的影像顯示,爆炸發生在美中時間晚間11點過後約10至15分鐘,離原定測試時間不遠,畫面顯示火箭上面偏中間一處先發生一次爆炸,緊接著左側也出現劇烈燃燒與碎片四射,整座測試架瞬間被火球吞沒,場景宛如炸彈爆炸。

Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)

爆炸當時,星艦正在裝填液態氧與部分甲烷燃料,過了90多分鐘火勢仍未受控,現場是星際基地內部專門進行低溫與熱火測試的Massey測試區。



以下文章來自: https://www.chinatimes.com/realtimenews/20250619004023-260408
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.
arrow
arrow
    文章標籤
    log periodic
    全站熱搜
    創作者介紹
    創作者 periodic 的頭像
    periodic

    log periodic ANTENNA

    periodic 發表在 痞客邦 留言(0) 人氣()


    留言列表 留言列表

    發表留言