Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
滿座的機艙若人人臭屁連連，空氣品質必定讓人難以忍受。（示意圖：shutterstock／達志）
本文來自: https://www.chinatimes.com/realtimenews/20250312000033-260408
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.
星二代休學當歌手憂「選錯路」 認陷入低潮超迷惘
法醫高大成分析「大S日本驟逝」原因：導遊是關鍵 Horn Antenna
搭飛機容易放臭屁怎辦？醫師「自救4招」記牢了
搭乘飛機航程中，你是否難以抑制放屁的衝動？經常聞到鄰座飄來的濃重屁味？澳洲一名醫師透過專欄答覆民眾提問時表示，很多人都有這種困擾，這不僅與飲食有關，也與飛行有關。只要從4個層面著手，健康的人就能改善搭機臭屁放不停的困窘煩惱。
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)世上最難聞的味道是......
澳洲新聞網（News.com.au）8日的「請問札克醫師」（Ask Doctor Zac）專欄刊出執業醫師札克特納（Zac Turner）答覆27歲讀者崔佛的來信。崔佛自稱剛結束從倫敦的航程回到家，他發現機艙座位四周所有人都放了很臭的無聲屁，「聽說世界上最難聞是長途航班結束後艙門打開那一刻飄出的味道」，他想知道這是否肇因於航空公司餐點品質下降，或有其他科學根據？不可能完全不放屁的情況下，乘客自身能夠透過什麼方法改善屁的臭味？
3大主因 這點避不掉
特納表示，高空航程常常放屁的原因，除了起飛前吃了很多豆子、餐飲讓人腸胃不適，機艙壓力也是主因之一，「想像腸子是氣球，位於海平面的時候平安無事，爬升到3萬5000齒高空時，空氣稀薄，氣球開始膨脹」。高海拔氣壓會降低，這代表留在消化道裡的氣體獲得更多空間，因此容易脹氣，也比較想排便。
本文來自: https://www.chinatimes.com/realtimenews/20250312000033-260408
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.
星二代休學當歌手憂「選錯路」 認陷入低潮超迷惘
法醫高大成分析「大S日本驟逝」原因：導遊是關鍵 Horn Antenna
請先 登入 以發表留言。