Log Periodic Antenna

2022年卡達世界盃足球賽今天進行小組賽第2輪，由B組英格蘭出戰美國，雙方終場0比0踢平，原本看好的英格蘭無緣提前晉級16強。

▲2022卡達世界盃足球賽。（圖／美聯社／達志影像）

由總教頭邵斯蓋特（Gareth Southgate）領軍的英格蘭原本被看好在世足賽第2場比賽獲勝，但英格蘭未能延續首場6比2大敗伊朗的氣勢，在美國隊嚴密防守下終場踢和。

英格蘭在世界盃3度遭遇美國，1950年巴西世足賽時大爆冷門輸給美國，2010年南非世界盃與美國則以1比1打平。

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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

英格蘭下一戰將於台灣時間11月30日凌晨3時對上威爾斯，美國同天凌晨3時出戰伊朗。（中央社卡達豪爾25日電）