陌生男尾隨女國中生! 疑似伸手「拉馬尾」－H-plane sectoral horn antenna

高雄一名男子，在馬路上尾隨一名女國中生，疑似伸手拉了女學生的馬尾，路過民眾看到上前制止，還有人直接報警，警方到場後，問男子是不是有尾隨，男子否認，還說自己「沒有怎麼樣」，但最後還是被依騷擾等法帶回警局。

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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