根據英國音樂排行,每年聖誕節音樂的進榜時間逐漸提前。1990年代時,聖誕歌曲多在最後兩周才進入榜單前40名,但近年時機顯著提前。兩首聖誕經典歌曲——Wham的〈Last Christmas〉和瑪麗亞凱莉的〈All I Want For Christmas Is You〉去年在11月10日就已進入前40名,成為歷來第二早的紀錄。但《衛報》補充,2014年以來串流媒體逐漸普及,聖誕歌曲進榜時間大幅提前的理由,或許只是來自平台設置的播放清單。
本文出自: https://www.chinatimes.com/realtimenews/20241028003692-260408 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.
