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Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)影》降落前狂繞圈 俄國噴射客機墜毀莫斯科

俄媒週五(12日)報導,一架載有3名測試機組人員的蘇愷超級噴射機100(Super Jet-100NEW95)在莫斯科墜毀,消息來源表示,這架飛機屬於俄羅斯天然氣工業航空(Gazpromavia),經計畫維修後從工廠返回機場的途中墜毀。目前,救援人員正在科洛姆納地區搜尋墜機地點,並已派出2架直升機進行搜救,機上沒有其他乘客。
綜合《塔斯社》、《LENTA》12日報導,這架飛機在計劃維修後進行測試飛行,機上所有人員已經遇難,據社群媒體電Telegram的社群@SHOT報導,飛機在墜毀前,飛機曾發出求救信號,並在空中盤旋以消耗燃料,但在第3次進場時墜毀。從飛行追蹤網路平台Flightradar24的飛行圖來看它繞了非常多圈。
《塔斯社》指出,這架飛機屬於俄羅斯天然氣公司(Gazprom)的公務機,它剛完成計劃維修,今天進行測試飛行。機上只有3名機組人員,在莫斯科州科洛姆納區進行計劃維修後進行的測試飛行時墜毀。
他還補充說,機上機組人員是蘇凱民用飛機公司的飛行員,從茹科夫斯基國際機場起飛進行飛行測試。
本文出自: https://www.chinatimes.com/realtimenews/20240712004395-260408
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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