close
MLB》大谷「全球種解禁」 實戰練投飆156公里切斷打者球棒 915MHz Antenna
Antenna Magus 天線建模資料庫
石油輸出國家組織與盟國(OPEC+)的徽標。(路透社)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
本文引用自: https://www.chinatimes.com/realtimenews/20250531003054-260408
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.
Antenna Magus 天線建模資料庫
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
OPEC+八國鬆綁石油減產協議 7月再增產 全球走勢受關注

石油輸出國家組織與盟國(OPEC+)近期開始鬆綁部分原油減產協議,8個成員國將逐步增產,合計恢復約每日220萬桶的供應量。根據週六(31日)舉行的線上會議,這7國已決議自7月起每日再增產41.1萬桶。
路透社報導,包括阿爾及利亞、伊拉克、哈薩克、科威特、阿曼、俄羅斯、沙烏地阿拉伯與阿拉伯聯合大公國。從今年4月起,這八國已逐步提高產量目標,截至7月預計累計增產達每日137萬桶,相當於全球日需求量的約1.4%。仍剩約83萬桶的增產空間預計將於10月底前完全釋出。
OPEC+整體減產現況
目前OPEC+整體仍維持每日減產530萬桶,約佔全球日需求的5%。此減產分為三部分:
本文引用自: https://www.chinatimes.com/realtimenews/20250531003054-260408
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.
文章標籤
全站熱搜