Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
本文來自: https://www.chinatimes.com/realtimenews/20240707003123-260408
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.
「烏干達洛克斐勒」與奇異日立合作 開發迷你核電廠
印度著名家族馬蒂瓦尼(Madhvanis),將出資協助美國奇異電氣(GE)開發小型模組反應器(SMR),爭取在英國建造的機會。
英國電訊報(Telegraph)報導,馬蒂瓦尼家族在非洲國家烏干達的歷史,可以追溯到 19 世紀,他們領導著一個橫跨糖業、鋼鐵生產、建築、旅館和保險業的企業集團,成為非洲最有權勢的家族之一,並在整個非洲大陸擁有商業利益後,獲得了「瓦干達洛克斐勒」的稱號。
現在,這個家族的投資公司馬蒂瓦尼國際(Madhvani International)希望與美國著名核電集團奇異-東芝( GE-Hitachi)所開發小核電技術,他們稱之為「類星體計劃」(Project Quasar),希望擔任示範作用,向其他國家展示 SMR 技術的巨大潛力。
馬蒂瓦尼集團認為,奇異-東芝所開發的BWRX-300型反應爐相當有潛力,這是一種小型化的整合模組型沸水反應爐,能夠產生約300百萬瓦的電力,該公司認為它的穩健技術已經可以大量生產,現在欠缺的只是投資意願。
集團希望一次建造4個BWRX-300,併連後總容量可達1000百萬瓦,效果與現有的大型反應器相似,但運轉彈性與安全性都比大型反應器更好。
本文來自: https://www.chinatimes.com/realtimenews/20240707003123-260408
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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