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Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
不只韓國 日本野火燒4縣 居民： 內心充滿焦慮、痛苦
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
以下內文出自: https://www.chinatimes.com/realtimenews/20250326004141-260408
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.
韓國森林野火釀成重大災情，鄰近的日本也同樣面臨野火威脅。愛媛、岡山和宮崎3縣延燒的山林大火遲遲無法撲滅，其中愛媛縣已經燒了4天，今天（26日）避難的範圍進一步擴大。
愛媛縣今治市的野火焚燒面積已達306公頃，燒毀7棟住宅和2間倉庫。今治市和西條市當局下令共3848戶，7494人進行避難。1名居民說: 「沒想到火勢蔓延得這麼快。我內心充滿了焦慮、痛苦和從未經歷過的感受。」富士新聞網(FNN)報導，如果火勢持續擴大的話，今治市可能有7.6萬戶停電。
岡山市的大規模野火也已進入第4天，從小規模逐步往東移，燒毀約420公頃的林地。當地兒島灣大橋已全面禁木通行。
以下內文出自: https://www.chinatimes.com/realtimenews/20250326004141-260408
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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