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Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
美國中情局總部爆槍響 不明女子開車闖CIA大門！當場中彈
位於美國維吉尼亞州蘭利(Langley, Virginia)的中央情報局總部發生一起槍擊事件，大門口出現一輛未減速的車輛，隨警衛人對其開槍逼停。後發現駕駛是一名女子，她上身受了槍傷，所幸並不致命立即送醫。
中央情報局發言人表示：「這是一起安全事件，正門目前關閉，直至另行通知。更多詳細信息將視情況公佈。」
有報導稱，事件發生在清晨4點左右，這名身份不明的女子試圖駕車穿過前門，結果一名保全人員立即開槍並擊中她。女子被送往附近的醫療中心，傷勢沒有生命危險，聯邦調查局已對槍擊事件展開調查。
文章來自: https://www.chinatimes.com/realtimenews/20250522005578-260408
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.
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