Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
文章來自: https://news.ttv.com.tw/news/115021200055001
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.
索馬利亞一架客機迫降衝出跑道，所幸機上55人全數生還。事發在當地時間10號，索馬利亞「星空航空」從首都摩加迪休起飛約15分鐘後，因為技術問題，隨即要求返航，但降落時，儘管成功觸地，但飛機無法在跑道上煞停，最後衝出機場盡頭的海灘。Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
從現場曝光的畫面看到，飛機停在海灘上，機翼折斷、艙門打開，幸好50名乘客跟5名機組員安全無虞，航空公司表示，飛行員臨危不亂、應變迅速是其中關鍵。
國際中心／陳韋仁 編撰 責任編輯／陳盈真
文章來自: https://news.ttv.com.tw/news/115021200055001
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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