查詢結果分析
來源資料
頁籤選單縮合
題名 | 無線電波傳播二線模式之反射損失=Reflection Loss of Radio Wave Propagation in Two-Ray Model |
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作者 | 洪健藏; | 書刊名 | 電信研究 |
卷期 | 26:3 1996.06[民85.06] |
頁次 | 頁435-450 |
分類號 | 448.8 |
關鍵詞 | 無線電波傳播; 二線模式; 反射損失; |
語文 | 中文(Chinese) |
中文摘要 | 無線電鏈路之無線電波傳播,以含反射波之二線式理論,推導出反射損失之計算式, 預估接教率因反射干擾引起之損失。由數值計算結果顯示不論反小點是在零高程或任何高 程,反射波之天線增益修正因數若大於0.1,則在任何射頻之最大反射損失皆隨天線增通修正 因數之增大而加大。若天線增益修正因數約近1,則最大反射損失將導致無法接收到信號功 率。若天線增益修正因數在0.1以下,則不論反射點是在零高程或任何高程,任何射頻之反 射損失可略。任何射頻之反射損失係隨發射天線或托收天線輻射中心高程或無線電鏈路長或 反射點高程之增加而成週期性增減變化其大小;而且射頻頻率愈高,反射損失變化之週期則 愈短。 |
英文摘要 | Formulas of computing reflection loss are derived from two-ray model theory of radio wave propagation including reflected wave in a radio link to predict the received power loss due to interference from reflection. Results of numerical calculation indicate that the maximum reflection loss at any radio frequency is found to increase with increasing the antenna gain correction factor for the reflected wave if the antenna gain correction factor is greater than 0.1 regardless of the elevation of reflection point. If the antenna gain correction factor is nearly equal to one, no signal power will be received in case of maximum reflection loss. The reflection loss at any radio frequency in negligible if the antenna gain correction factor is less that 0.1 regardless of the elevation of reflection point. Reflection loss at any radio frequency is found to follow a periodic change with elevation of the receiving or transmitting antenna radiation center, or the radio link length, or the elevation of reflection point; and the period for the periodic change of reflection loss is found to decrease with increasing radio frequency. |
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