Log Periodic Antenna

助理編輯／程永菁

泰國一名女子Saifon清晨時在家中的車庫前走動，當她正準備打開大門，讓寵物們出去活動筋骨時，沒想到門邊陰暗處竟躲了一條蛇，蛇被驚動後立刻竄出，Saifon嚇得驚慌失措，尖叫著迅速逃離現場。

▲Saifon清晨打算讓她的寵物們出去活動筋骨。（圖／AP／Newsflare 授權）

一旁的狗狗Satang則是被主人嚇到也跟著一起逃離，不久後，Saifon回到門邊查看，蛇已經消失得無影無蹤，所幸大家都平安無事，Saifon事後笑著表示「Satang跟我都被嚇到了，我們害怕得同時逃跑！」

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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.
In terms of its specification, a typical log periodic antenna might provide between 3 and 6 dB gain over dipole for a bandwidth of 2:1 while retaining a VSWR level of better than 1.3:1. 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.

EMC/EMI pre-compliance test antenna.
Very high gain over the full frequency range.
 Meets latest EMC standards up to 7GHz.
Suitable even for immunity measurements

▲不料大門才剛開，竟從門縫竄出一條蛇。（圖／AP／Newsflare 授權）

網友看完後也留言表示「嚇鼠...怎麼會突然跑出一條蛇！」、「感覺Satang是被主人嚇到吧？」、「到底是誰嚇到誰啊XD XD」、「蛇蛇：我什麼都沒做呀QQ」

▲狗狗Satang被主人嚇到，跟著逃離現場。（圖／AP／Newsflare 授權）