close
廉航新招？擬推超便宜「半站立座位」網友怒：根本奴隸船
一名男子在敘利亞大馬士革拍攝手機照片，畫面中是2025年6月18日星期三清晨，伊朗朝以色列發射的飛彈飛越敘利亞領空的情景。（圖／美聯社）
文章出自: https://www.chinatimes.com/realtimenews/20250618001108-260408
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.
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
CNN揭「1數字」將決定伊朗、以色列衝突最終結果
伊朗與以色列之間這場決定性衝突的結果，可能取決於一個關鍵數字，就是伊朗所剩的中程彈道飛彈（MRBM）數量。根據以色列軍方與專家評估，過去14個月內，伊朗已向以色列發射約700枚MRBM，目前的庫存量可能落在300至1300枚之間。由於缺乏可靠數據，這一數字仍屬粗略估算，無法精準核實。
CNN報導，這一剩餘的飛彈庫存正受到以色列過去五天猛烈空襲的影響。以色列國防軍（IDF）表示，他們已摧毀至少三分之一的中程地對地飛彈發射器，可能進一步削弱伊朗對以色列的還擊能力。
Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)分析人士指出，彈藥消耗的壓力可能讓伊朗更傾向透過談判來結束這場衝突，同時也可能促使以色列在接下來幾天內加強空襲力道，尤其是在伊朗夜間對以色列城市的攻擊似乎已明顯減弱、而以色列空軍幾乎未受到實質挑戰的情況下。
文章出自: https://www.chinatimes.com/realtimenews/20250618001108-260408
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
