曹西平今出殯 首波到場弔唁藝人是他們 Horn Antenna
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
文章來自: https://news.ttv.com.tw/news/11502020000500W
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.
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)美股上週五四大指數全面收黑，連帶台股也受到衝擊，今（2）天開盤下跌55.29點，以32008.46點開出，跌幅0.17％，且隨後跌勢持續擴大，早盤一度重挫473.6點來到31590.15點，失守32000整數大關。
權值股方面，護國神山台積電（2330）下跌25元至1750元，暫報1755元；鴻海（2317）下跌1元至219.5元，暫報217元；聯發科（2454）下跌45元至1715元，暫報1705元；台達電（2308）下跌35元至1185元，暫報1190元。
責任編輯／馮康蕙
文章來自: https://news.ttv.com.tw/news/11502020000500W
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.
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