Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
2025年4月30日，耶路撒冷附近野火災情，以色列消防員正在進行滅火作業。（美聯社）
本文來自: https://www.chinatimes.com/realtimenews/20250501003439-260408
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.
影》野火肆虐未歇 強烈沙塵暴襲擊以色列南部！國慶日活動喊卡
INSANE sandstorm sweeps southern Israel, West Bank amidst raging wildfire crisis pic.twitter.com/QPDIgw3hft
— RT (@RT_com) May 1, 2025
以色列南部週三（30日）遭遇嚴重沙塵暴侵襲，南部多地能見度驟降，與中部肆虐的野火形成雙重災難，強風不僅加劇火勢，還使滅火行動更加困難。該國 列目前已經取消5月1日以色列獨立日（國慶日）相關活動 。
BREAKING: 🇮🇱🔥 If fire wasn’t enough, a Massive Sandstorm has hit Israel.
— ADAM (@AdameMedia) April 30, 2025
God’s wrath is glorious.
pic.twitter.com/KSMZmfclBl
綜合外電報導，南部內蓋夫沙漠城市俾什巴（Beersheba）遭遇罕見沙塵暴，媒體播放的畫面顯示，巨大的沙塵雲將整座城市吞沒，軍方位於內蓋夫的希夫塔基地（Shivta Base）也受到衝擊。根據以色列媒體12頻道報導，士兵在強風吹襲下難以關閉營門：「今晚的希夫塔基地，被罕見的沙塵暴籠罩。」
而在以色列中部地區耶路撒冷與特拉維夫之間，多個城鎮持續受到野火侵襲，消防隊日夜奮戰試圖控制火勢。耶路撒冷消防救援區指揮官費里德曼（Shmulik Friedman）接受以色列軍方廣播電台採訪時表示：這可能是「以色列史上最大規模的野火」。
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)本文來自: https://www.chinatimes.com/realtimenews/20250501003439-260408
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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