Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
2025年2月13日，北約秘書長呂特（Mark Rutte）於比利時布魯塞爾聯盟總部舉行的北約國防部長會議上舉行了新聞發布會。（路透社）
本文出自: https://www.chinatimes.com/realtimenews/20250214003475-260408
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.
手機降價最新排名曝：Google的Pixel 9系列來了 915MHz Antenna
北約秘書長：從未承諾過烏克蘭加入北約
北約秘書長呂特（Mark Rutte）週四（13日）談到烏克蘭未來的北約成員資格時，呂特強調，北約仍然致力於烏克蘭的未來入盟，但從未承諾烏克蘭必然加入北約。
據北約官方新聞稿，呂特在回應俄羅斯流亡媒體《Holod Media》記者提問時表示：「我們的重點在於確保普丁（Vladimir Putin）永遠不再對烏克蘭發動攻擊，而不是在和平談判階段就承諾烏克蘭加入北約。」
呂特補充，北約有多種方式可以保障烏克蘭的安全，未來將尋求實際可行的方案來確保該國不再受到侵略。不過，北約去年（2024）7月11日，32個成員國曾一同正式宣布，烏克蘭正走在加入北約「不可逆的道路上」。
本文出自: https://www.chinatimes.com/realtimenews/20250214003475-260408
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.
手機降價最新排名曝：Google的Pixel 9系列來了 915MHz Antenna