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Melody傳有新男友Howard 同是學霸緣分天註定 915MHz Antenna
日本Elecom推出世界首款鈉電池行動電源，並且在炎熱、酷寒環境都能順暢運作。(圖/Elecom)
本文來自: https://www.chinatimes.com/realtimenews/20250318005507-260408
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)
日本Elecom推出世界首款鈉電池行動電源 號稱13年不壞
日本電腦周邊品牌 Elecom ，剛剛推出了「世界第一款鈉離子電池行動電源」，號稱使用壽命極長，比傳統的鋰離子電池要耐用很多，並且也更抗熱與抗寒，能夠在極熱和極冷的氣候下運作。
新阿特拉斯(New Atlas)報導，這款行動電源的產品序號是DE-C55L-9000， 外觀與市面上多數行動電源都類似，呈圓磚狀，電池容量9,000 mAh(毫安培小時) 、連接埠是45 W Type-C 和 18 W Type-A ，以及LED充電指示燈。
真正值得介紹的是鈉電池技術。鈉離子電池的工作原理和構造與鋰離子電池非常相似，但鈉離子電池使用更便宜、更豐富的鈉作為陰極材料，並使用鈉鹽而，不是鋰鹽作為電解質。
本文來自: https://www.chinatimes.com/realtimenews/20250318005507-260408
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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