建中生作品以911為靈感惹議　學校道歉了 Open Boundary Quad-Ridged Horn Antenna
校方甩鍋？賓賓哥怒揭對話紀錄：老師明明知悉要直播 Horrn Antenna
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)

台彩大樂透已經7連槓，今（12）晚開出第114000113期，頭獎獎金上看1.9億，號碼由小至大為15、17、24、26、40、47；特別號33。

其他獎項獎號如下：

．今彩539：10、24、26、28、35。Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)

．39樂合彩：10、24、26、28、35。

．49樂合彩：15、17、24、26、40、47。

．3星彩：350。

．4星彩：0352。

派彩結果及中獎號碼以台彩官網公布為主。

責任編輯／洪季謙



文章來自: https://news.ttv.com.tw/news/11412120004600W
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.