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Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
本篇文章引用自此: https://n.yam.com/Article/20240723861349
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.
中央氣象署已於23日11時30分發布中颱「凱米」海上陸上颱風警報，目前宜蘭、基隆、新北及桃園區域已公告警戒區，為維護民眾生命財產安全，海巡署北部分署針對公告警戒區內逗留民眾及釣客，進行依法勸離。
北部分署已派遣106人次、43車次，針對北部以及東北角沿海地區熱門水域遊憩區域，主動實施勸離，並宣導民眾於颱風警報期間，勿冒險至海邊從事各項活動，以確保自身生命及財產安全。Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
北部分署表示，依據氣象資料顯示，本次凱米颱風適逢大潮，配合颱風挾帶豐沛水氣，易有顯著雨勢發生；另漲潮期間北部及宜蘭沿海低窪地區需留意海水倒灌及積淹水，另提醒民眾切勿擅闖禁（限）制公告區域，經勸導不離去者，將依「災害防救法」蒐證函送主管機關裁罰，最高可處新臺幣二十五萬元罰鍰，若遇到救溺案件時，請儘速撥打「118」海巡服務專線，海巡署接獲通報將立即前往協處，爭取黃金救援時間。
The post 防範「凱米」颱風 北部海巡總動員勸離觀浪民眾 appeared first on 報新聞 Mega News.
本篇文章引用自此: https://n.yam.com/Article/20240723861349
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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