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)
烏克蘭再派無人機襲擊莫斯科 兩座機場臨時管制
俄羅斯國防部聲稱，烏克蘭對俄羅斯領土和佔領地區發動無人機空襲，導致莫斯科2個機場實施臨時管制。並聲稱，俄軍防空部落擊落與攔截了61架無人機，所以損失微乎其微。然而也有災情報告指出，莫斯科南部的化學工廠因無人機殘骸而引發火災，造成2人受傷。
烏克蘭國通社報導，俄方聲明寫道：「當地時間6月7日23時至隔天早晨7時30分，布良斯克、別爾哥羅德、卡盧加州、圖拉州、奧廖爾州、庫爾斯克州、莫斯科州和克里米亞上空攔截並摧毀了61架烏克蘭飛機型無人機。」
「至週日凌晨，至少有 10 架烏克蘭無人機在接近莫斯科時被擊落，莫斯科兩座機場已實施臨時管制。」
以下文章來自: https://www.chinatimes.com/realtimenews/20250608002841-260408
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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