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Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
樂高再進化！百款玩具將用30％再生輪胎
家喻戶曉的國際知名玩具品牌「樂高」，推出採用30%以上回收材料製成的新型輪胎，這些創新輪胎已出現在部分樂高套裝中亮相，並計劃於2025年年底全面推出。
「樂高」深知自己的影響力，所以持續發展永續措施，展示品牌在環境責任方面皆能發揮領導作用。他們的回收輪胎計劃只是樂高永續發展項目之一，其他包含樂高迷你人偶配件的材質，自2018年以來，就開始使用來自巴西甘蔗的生物聚乙烯，目前已用於200多種樂高元素。Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)另外還有再生人造大理石，用於光劍和窗戶等透明零件，成分包含20%的再生材料，目標是達到 85% 樂高套裝的再生材料含量。
這次的新輪胎是採用 rSEBS 製造，而 rSEBS是一種由廢棄航海設備與回收的引擎油混合而成的材料；其外觀、功能與傳統樂高輪胎相同，維持了該品牌的品質和耐用性標準。
文章來自: https://www.chinatimes.com/realtimenews/20250523002733-260408
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.
火腿守備「煮粥」古林初登板憾吞敗 Outdoor Antenna
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