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Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
烏克蘭無人機連續兩晚襲擊莫斯科 打亂俄羅斯勝利日預演
烏克蘭連續兩天晚上派出大量無人機襲擊莫斯科，雖然沒有造成嚴重的損失和人員傷亡，但是也導致俄羅斯首都4個機場的航班中斷。俄羅斯也只能取消勝利日閱兵遊行預演。俄羅斯將在5月9日舉行聖大的紅場閱兵，有多少國際領導人願意出席，成為檢視俄羅斯國際地位的指標。
CNN報導，莫斯科市長索比亞寧(Sergei Sobyanin)週二在電報頻道平台的貼文表示，5日至少有19架烏克蘭無人機在接近首都時被防空部門擊落，而前一天晚上，俄羅斯防空部隊也該莫斯科附近擊落4架無人機。
索比亞寧說，目前還沒有嚴重損失或人員傷亡的報告，但被擊落的無人機的碎片落在了好幾條主要公路上，造成一些交通不便。據俄羅斯航空管理單位表示，出於安全預防措施，莫斯科4個機場的航班被迫暫停。
本文引用自: https://www.chinatimes.com/realtimenews/20250506004070-260408
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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