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Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
生活中心／綜合報導
新一波油價雙漲！台灣中油公司自15日凌晨零時起，汽、柴油價格各調漲0.2元及0.1元，每公升參考零售價格分別為：92無鉛汽油29.2元、95無鉛汽油30.7元、98無鉛汽油32.7元、超級柴油26.6元。
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
台灣中油表示，本週國際油價下跌。浮動油價調整原則之調價指標7D3B週均價下跌1.26美元，新臺幣兌美元匯率升值0.015元，計算跌幅為1.19%。
按浮動油價機制調整原則，汽、柴油應調價格與本週參考零售價格相比，汽、柴油應各調漲3.5元及5.0元，惟為維持價格低於亞洲鄰近國家(日、韓、港、星)，汽、柴油各吸收3.1元及4.7元，吸收後95無鉛汽油超出30元，啟動油價平穩措施，第一階段吸收25%調幅四捨五入，汽、柴油每公升各吸收0.2元。
因雙重平穩機制啟動，汽、柴油共各吸收3.3元及4.9元，國內汽、柴油實際價格各調漲0.2元及0.1元。
以下內文出自: https://n.yam.com/Article/20240714830331
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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