Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
東京一列新幹線車廂內今晨傳出，一個行動電源因不明原因起火，造成1人受傷。（示意圖：Shutterstock/達志）
引用自: https://www.chinatimes.com/realtimenews/20250828001141-260408
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.
百萬YTR黃氏兄弟竟用盜版《鬼滅》緊急出面道歉補救措施曝光 Horn Antenna
快訊》東京新幹線車廂行動電源起火 1人受傷
又有行動電源釀禍。日本新聞網(NNN)報導，根據東京消防廳收到的消息，今日上午8時（台灣時間上午7時）過後，原定抵達JR東京上野站的一列新幹線車廂內，一個行動電源因不明原因起火，造成1人受輕傷。
共同社報導事發於上越新幹線車列車。當時行駛於大宮―上野之間的列車內一名50多歲男性的手提行李箱內的行動電源冒煙。男子想用衣服蓋住行動電源滅火，右手手指因被灼傷。所幸火勢未在車內延燒開來。東京消防廳出動了消防車等一共3輛車，相關單位正在調查詳細事發經過。有部分車次因此誤點。
引用自: https://www.chinatimes.com/realtimenews/20250828001141-260408
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.
百萬YTR黃氏兄弟竟用盜版《鬼滅》緊急出面道歉補救措施曝光 Horn Antenna