Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
一架維珍航空（Virgin Atlantic）波音787-9夢幻客機5月底在1萬2192公尺高空期間，駕駛艙的擋風玻璃突然「多處破裂」。圖為維珍航空資料照。（資料照／路透社）
本文出自: https://www.chinatimes.com/realtimenews/20240623001658-260408
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.
波音1.2萬米高空擋風玻璃「多處破裂」！機組員嚇壞返航
維珍航空（Virgin Atlantic）一架波音787-9夢幻客機5月底從倫敦飛往舊金山期間，客機在1萬2192公尺高空時，駕駛艙的擋風玻璃突然破裂，畫面顯示擋風玻璃上有「多處破裂」。報導指出，玻璃破裂讓機組員嚇壞了，客機隨即返航。值得注意的是，調查人員不認為是鳥擊釀禍，對這起意外也相當困惑。
英國《太陽報》（The Sun）報導，滿載的維珍航空VS41波音787-9夢幻客機5月27日從倫敦希斯羅機場起飛前往舊金山，客機在行經格陵蘭與冰島期間，駕駛艙中間的擋風玻璃突然破裂。Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
《太陽報》公布的畫面顯示，擋風玻璃上有「多處破裂」。
當時飛機已起飛3小時，客機位在40000英呎（1萬2192公尺）高空，機外溫度為攝氏零下50度。
報導指出，四層擋風玻璃破裂讓駕駛艙內的機組員「嚇壞了」，機長隨後宣布返航倫敦，據悉機師還試圖安撫乘客，消除他們對機艙失壓的擔憂。
本文出自: https://www.chinatimes.com/realtimenews/20240623001658-260408
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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