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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》奈米科學大突破 首次拍攝氫氧原子合成水的畫面
我們都知道「氫與氧結合成水」，現在科學家把這個基礎化學常識推升到新的境界：把過程拍攝下來。同時，這個實驗也發明了一種新的造水方法。
新阿特拉斯(New Atlas)報導，眾所周知，一種名為鈀(化學符號Pd)的稀有元素，是將氣態氫和氧轉化為水的良好催化劑，但是具體的工作原理仍知之甚少。因此，在這項新研究中，美國西北大學(Northwestern University)的研究人員使用了一種新開發的觀測技術，來瞭解化學反應期間的分子細節。
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
他們將鈀樣品放入蜂窩狀奈米反應器中，並用超薄膜玻璃包裹。然後，引入氣體。再利用「高真空透射電子顯微鏡」(High-vacuum transmission electron microscopes)進行觀察。
本文引用自: https://www.chinatimes.com/realtimenews/20241003004548-260408
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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