來自: https://stars.udn.com/star/story/10092/9237822 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. 國際 40分鐘內連4震襲日本青森！氣象廳：不屬「後發地... 2025.12.12 13:04 日本青森縣東方外海今（12）日上午接 挨酸「只剩一張嘴」！凱莉被羞辱也要講嗆爆：他們腦袋壞掉 Horn Antenna