Log Periodic Antenna

[周刊王CTWANT] 大陸黑龍江一名女子花了人民幣5千元（約新台幣21800元）買了掃地機器人，沒想到使用自動清掃功能，卻發現機器竟把狗屎抹了滿屋子都是，讓她氣炸退貨，最後花了6小時，搞到半夜才完全清理乾淨。

綜合陸媒報導，事發於15日，黑龍江齊齊哈爾的李女士分享掃地機器人將狗屎掃滿屋的視頻，她表示這個掃地機器人是花了人民幣5千元剛買的，沒想到用自動清掃功能卻出現該情況，目前已經退貨，自己花6小時搞到半夜才清理乾淨。

消息曝光後立刻引起熱議，不少網友認為，掃地機器人不能清理狗屎本來就是常識，紛紛留言表示「這不是很正常嗎？還能退貨嗎？。。。

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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

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