close
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
徜徉大自然之中享受遠離塵囂的清靜氛圍，這是許多人專程赴郊外露營的重要目的。（示意圖：shutterstock／達志）
到野外露營生火烹飪、圍在營火旁飲食聊天很正常，但別忘了降低音量，以免打擾其他露友安寧。（示意圖：shutterstock／達志）
本文來自: https://www.chinatimes.com/realtimenews/20240722000105-260408
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.
露營2舉動「超級顧人怨」 專家3守則不掃興保平安
大城市的夏天熱到讓人受不了，山野露營成了遠離塵囂又能納涼的休閒好選項。然而，到野外露營不代表有權利恣意妄為。網路論壇最近有愛好旅遊人士提問，哪些是露營時最需要注意的禮節？行家給出的答案有2個最受網友附和，若不想成為整個營區的討厭鬼，務必自我約束。
英國《太陽報》18日報導，Reddit論壇的露營子論壇近日出現有關露營禮節的討論串。在各路行家給出的答覆之中，最受網友贊同的就是「尊重他人隱私」。
一名露營老手直言：「不要穿過其他人的營地，留在你自己的營地就好，想活動時去公共區域。」這點其實是非常基本的禮儀，畢竟，隨意在他人的帳篷或露營車周圍走動很容易嚴重侵犯他人隱私。大多數人到野外露營是為了放鬆身心，如果自己紮營的位置出現陌生人窺探，必定會覺得很討厭。有專家建議，在自己使用的營地周圍標記明確的界線，可免混淆。
另一個博得許多網友首肯的露營基本禮節是「避免製造太多噪音」，直接影響露營品質好壞。Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)噪音經常惹火營地鄰近的陌生露友，有可能因此發生爭執。一名專家指出，要做到尊重他人，避免製造太多噪音是理所當然的禮貌。尤其帶著孩子一同露營的家長，入夜之後應當注意子女發出的噪音音量。
露營裝備零售商蘇克朗（David Scotland）曾提出多項讓露營之旅順利平安的要點，《太陽報》挑選了與帳篷有關的3項守則提醒讀者：
本文來自: https://www.chinatimes.com/realtimenews/20240722000105-260408
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
留言列表
留言列表發表留言
