《寶島西米樂》 楊子儀跪地頂罪 逼哭尹昭德 男男背後式環抱 意外飄出CP感... Horn Antenna
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
SJ-100是俄羅斯自製的區間客機，載客量約100人。(圖/Yakovlev )
本文出自: https://www.chinatimes.com/realtimenews/20250827004090-260408
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.
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
俄羅斯航空業困境 14架自製客機SJ-100發現機身缺陷
親克里姆林宮的媒體《消息報》(newspaper Izvestia)的報導，引述製造商和民航局的信函，俄羅斯國產的SJ-100超級噴射客機，至少14架存在設計缺陷，這將會影響俄羅斯的國內航班。
報導稱，飛機製造商雅克列夫航空(Yakovlev )在5月向俄羅斯民航運輸局通報這些結構問題，到了8月1日，俄羅斯民航局要求，序號95104至95117的飛機，必須返廠檢查並進行必要的維修。
所有 14 架SJ-100都是2016年製造，也都有同樣的題。
本文出自: https://www.chinatimes.com/realtimenews/20250827004090-260408
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.