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Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)波音又是你！聯航757客機從洛杉磯起飛後 輪子掉1枚
聯合航空(United Airlines )表示，該公司的一架波音757客機，從洛杉磯起飛後失去了主起落架1枚輪子，所幸航班仍然安全降落在丹佛。
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)美聯社報導，聯航在聲明中表示，此為編號1001航班，並沒有人員受傷的報告。另外「輪子已在洛杉磯找到，我們正在調查造成這一事件的原因。」
從機場拍攝的影片，紀錄到沒有與飛機一同起飛的輪子，掉落之後的亂滾情況。
這架波音 757-200飛機，載有 174 名乘客和7名機組人員。
這並非今年以來的波音客機失輪事件。3月7日，同樣是聯合航空，一架波音777-200型客機，從舊金山起飛後不久，輪胎從半空掉落，竟砸在機場員工停車場的一輛汽車上，所幸沒有人員受傷，飛機也安全抵達目的地。
本文引用自: https://www.chinatimes.com/realtimenews/20240709004610-260408
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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