Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Afterpay共同創辦人莫爾納（中）。（資料照/法新社）
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
來自: https://www.chinatimes.com/realtimenews/20250817001294-260408
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.
被老闆嫌浪費天賦 澳洲青年創業7年變億萬富豪
35歲澳洲創業家莫爾納（Nick Molnar），因家族經營珠寶生意，從小就對創業產生濃厚興趣，但他進社會後還是先當上班族。直到2014年他與人共同創立讓消費者先購物後付款的Afterpay公司。7年後這家公司被推特（現為X）創辦人多爾西的金融科技服務公司Square以 290億美元（約新台幣8713億元）收購。這一切得歸功於他的一位前老闆，老闆說他的天賦只在公司上班太浪費了！
莫爾納（Nick Molnar）的家族在雪梨經營珠寶生意。近日他向CNBC Make It表示：「我的父母是零售業創業者，他們一直教我交易的複雜細節、零售的運作方式」。所以他青少年時期就在 eBay 上販售家族公司的珠寶，後來更建立獨立網站。但大學畢業後，莫爾納沒有立刻創業。因為他覺得既然擁有商學學位、商業背景，就應該去找一份金融工作。
2011年他進入澳洲創投公司 M.H. Carnegie & Co.，老闆卡內基（Mark Carnegie）意外成了他創業夢想的最大推手。卡內基幾乎每天都會問莫爾納：「今天賣了多少珠寶？」當時他的網站年營收約有200萬澳幣（約新台幣3909萬元）。卡內基一直催促他去創業，曾對他說：「我覺得你現在待在我的公司是一種浪費。我會幫你保留一年的工作，讓你有勇氣去創業。」
來自: https://www.chinatimes.com/realtimenews/20250817001294-260408
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.