Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)"
]
}
}
紐約監獄取消全天探視 擔心日全食引發囚犯狼性 | 蕃新聞
文章來自: https://n.yam.com/Article/20240406297432
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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紐約監獄取消全天探視 擔心日全食引發囚犯狼性
獨家報導/獨家報導
2024.04.06 11:55
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)獨家報導 記者張璿卿／綜合報導
紐約矯正與社區監督部（NYSDCCS）宣布，隨著罕見的「日全食」將於8日出現，超過20間設施將取消當天的探視活動。這些設施中有23個位於日全食的路徑上，預計將在日全食期間經歷「天色全黑」的情況，為防止可能的騷動或暴亂，當局決定全天禁止探視，採取系統性封鎖措施。
在日全食路徑以外的監獄或矯正設施，雖然不需完全關閉，但探視時間將限制在8日下午2時前，且所有囚犯必須在當天下午2時至5時之間待在自己的牢房內。這項安全措施將在9日恢復正常。
日全食預計將於8日下午3時15分至3時30分之間發生，包括紐約州西部和北部地區在內的地區將能觀察到這一罕見的天文現象，屆時月亮將經過地球和太陽之間，將白天瞬間變為黑夜，持續時間約為1.5到3.5分鐘。
更多《獨家報導》
文章來自: https://n.yam.com/Article/20240406297432
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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