Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
DeepSeek今年1月底推出人工智慧模型，對於市場龍頭OpenAI構成不小壓力。（資料照／路透）
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
引用自: https://www.chinatimes.com/realtimenews/20250220005225-260408
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.
DeepSeek問世成助力？OpenAI活躍用戶數破4億
中國大陸AI新創公司「深度求索」（DeepSeek）今年1月發表AI模型R1，震撼國際人工智慧業界，對於全球業界龍頭OpenAI的ChatGPT構成極大威脅，各家競爭更形激烈。美國財經媒體CNBC周四（20日）報導，在DeepSeek崛起來勢洶洶的情勢之下，總部位於美國舊金山的OpenAI今年2月每周活躍用戶數站上4億大關，不到3個月就增加33%。
OpenAI營運長萊特凱普（Brad Lightcap）向CNBC表示，截至今年2月，OpenAI的每周活躍用戶數為4億，比去年12月達成的3億用戶進步了33%。
萊特凱普說，ChatGPT愈來愈好用，也愈來愈廣為人知，這是「自然進展」：「大眾經由口俺相傳得知ChatGPT，發現它很實用，發現周邊朋友都在使用。」他表示，個體需要時間去找到能引發共鳴的使用案例，但「大眾的確想要擁有這類工具，在他們眼中極具價值」。
引用自: https://www.chinatimes.com/realtimenews/20250220005225-260408
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.