Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
南韓濟州島以多種美景吸引大量觀光客造訪。外國遊客不當行為頻傳，對當地民眾造成嚴重困擾。（示意圖：shutterstock／達志）
文章來自: https://www.chinatimes.com/realtimenews/20250826004881-260408
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.
赴「韓國夏威夷」注意！14種小違規初犯破財 再犯重罰
在南韓有「韓國夏威夷」美譽的濟州島，近期民怨升高，原因出在屢有外國觀光客行為不當。濟州島官方最近印行旅遊秩序指南，創下南韓首例，內容詳列觀光客常見且可能挨罰的輕微違規事項，以中、英、韓三種語言印行。亂丟垃圾、違規穿越馬路都在開罰之列，罰金5萬韓元（新台幣約1095元），情節重大可能面臨拘留處置，再犯一經查獲將受重罰。
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)綜合美國有線電視新聞網（CNN）、英國廣播公司（BBC）報導，去年逾1300萬人造訪美景如畫的濟州島，今年已超過700萬人，這座火山形成的島嶼以海灘、步道、茶園、山景等風光聞名。國際航空運輸協會2024年統計，首爾與濟州島之間1小時15分鐘航線已成全球最繁忙航路之一。濟州島旅遊協會表示，新冠疫情消退、旅遊重啟以來，濟州島外國遊客人數增加幾乎3倍，去年達190萬人次，近7成來自中國。
飛機、輪船帶來許多觀光客與商機，去年外國遊客為當地經濟貢獻9.26兆韓元（台幣約2030億元）收益。觀光客暴增也導致濟州島居民生活備受干擾，承受觀光公害之餘，外國遊客違規之舉也引發民怨。例如今年4月有人拍到外國遊客搭乘公共汽車時吸菸，在IG發布後瘋傳，網友怒批「應該立即驅逐此人並罰款，若他們不繳罰款就禁止買機票」。去年夏天也有外國兒童在人行道排便，引發網友公憤，當時就有人呼籲加重對外國遊客違規開罰金額。
文章來自: https://www.chinatimes.com/realtimenews/20250826004881-260408
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.