Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
泰國於5月1日起實施入境新措施，旅客在落地前3天內，須上網進入「泰國電子入境卡系統」（Thailand Digital Arrival Card，TDAC）填寫入境資訊。（資料照／shutterstock）
本篇文章引用自此: https://www.chinatimes.com/realtimenews/20250416002983-260408
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.
遊泰注意！5／1實施「電子入境卡」新規
要前往泰國的旅客注意！泰國於5月1日起實施入境新措施，旅客在落地前3天內，須上網進入「泰國電子入境卡系統」（Thailand Digital Arrival Card，TDAC）填寫入境資訊。
泰國「民族報」（The Nation）報導，泰國外交部先前宣布，自5月1日起，所有外國旅客入境泰國時，不論是透過陸路、搭機或海陸，落地前3天內，都必須上TDAC系統填寫入境資訊。
旅客必須在系統內填寫包括全名、國籍、電話號碼、電子郵件地址、護照等個人資訊細節，另外也要提供航班號碼、入境目的、在泰國的地址（例如飯店或住所地址）等旅行資訊。
本篇文章引用自此: https://www.chinatimes.com/realtimenews/20250416002983-260408
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.