log periodic ANTENNA

Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)（軍聞社記者文仁臺北21日電）因應漢光40號演習到來，國防部今日於各社群平台推播「漢光40小科普」動畫影片，透過動態圖卡，讓國人輕鬆瞭解漢光40號演習各項演習階段及課目重點。 　動畫內容以模擬遊戲畫面方式，依序介紹「整體防空」、「聯合截擊」、「聯合國土防衛作戰」、「防衛中樞作戰（夜間）」等各項操演課目重點，並整理演習驗證重點，包括「去中心化指管」、「聯合作戰計劃」、「交戰規則」、「整體後勤支援」以及「連續及聯動原則」。 　透由動畫圖卡方式描繪漢光40號演習，期能讓民眾理解國軍，展現軍民團結一心，共同捍衛民主自由價值的精神，達成戰備整備目標，建立堅實可恃戰力，確保國家安全。Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)

本篇文章引用自此: https://n.yam.com/Article/20240721947452
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.