北市觀傳局暴雷是真的！KARA來台陪粉絲倒數迎接2026 Horn Antenna
財經 11月通膨數據激勵美股！美光財報拉抬AI 四大指... 2025.12.19 08:09 美國公布11月消費者物價指數，年通膨
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
本篇文章引用自此: https://news.ttv.com.tw/news/11412180004900N
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.
財經 11月通膨數據激勵美股！美光財報拉抬AI 四大指... 2025.12.19 08:09 美國公布11月消費者物價指數，年通膨
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
關心美股表現，《金融時報》報導指出，甲骨文約100億美元的資料中心計畫，已經失去私人貸款機構的資金支持，再度動搖市場對AI概念股的信心，相關類股大幅回落，四大指數終場全面下跌。
道瓊工業指數翻黑下跌228點，收在4萬7885點；那斯達克指數下跌418點，收在2萬2693點；S&P500指數下跌78點，收在6721點；費城半導體指數下跌263點、3.78%，收在6695點。
焦點個股，甲骨文 （ORCL） 重摔5.4%，輝達下跌3.81%、蘋果跌1.01%、微軟跌0.06%、Meta跌1.16%、谷歌跌3.14%、特斯拉挫4.62%；台積電ADR跌3.45%，收在276.96。
國際中心／陳韋仁 編撰 責任編輯／陳盈真
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)本篇文章引用自此: https://news.ttv.com.tw/news/11412180004900N
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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