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Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
日本醫療直升機「白鳥」墜海 3獲救3失聯
日本媒體報導，當地時間下午約3點半左右，九州福岡縣和白醫院的空中急救直升機「白鳥號」，在運送離島的病患時，返航途中墜海，6名乘客已尋獲3人，但還有3人尚需搜尋。
根據長崎縣壹岐消防署等單位的消息，這架直升機正從對馬島飛往福岡的醫院，機上載有對馬市一名80多歲的女性病患，及其60多歲的家屬，還有1名醫師、1名女性護理師，以及正副駕駛共6人。
報導稱，搜救的海上保安廳直升機到達事故現場時， 病患、醫生與護理師抓著載浮載沉的直升機而獲救，但正副駕駛與病患家屬仍在搜尋中。
以下內文出自: https://www.chinatimes.com/realtimenews/20250406002713-260408
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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