本論文的研究方向主要分成兩個部分，其一為探討美國國家標準C63.5在高頻上(1GHz - 6GHz)的適用性。一般而言，對寬頻天線的量測校正，皆採用C63.5所訂定之標準場方法( Standard Site Method, SSM )來計算天線之天線因子。經由本研究之理論推算、數值模擬與實際量測，得到在高頻上，水平和鉛直極化會因場型的關係而有差異。並且討論了天線因子、接收天線高度和場型因素的關係，而考慮場型的影響可使預測之量測結果更接近於實際情況。其二為探討量測場地之接地面的問題。根據C63.7的規定，一個合格測試場之接地面有一定面積大小的限制，為此本研究提出一套方法，整合斜向天線的量測方法和接地面形狀的設計，可使得在較小接地面條件下，得到接近較大接地面的量測結果。此方法可有效縮小量測場地所需的面積，進而減少場地設置的成本，並且此法可同時適用在水平和鉛直極化。

The researches of this thesis are divided into two parts. One is to investigate the applicability of ANSI C63.5 in high frequencies of 1 GHz to 6 GHz. In general, the Standard Site Method (SSM) of C63.5 is usually used to calculate the antenna factors for the calibration of broadband antennas. Through the theoretical calculations, the numerical simulations and measurements, we found that the discrepancies between the calibrated results of horizontal and vertical polarization related to the un-dipole-like pattern in higher frequencies. Furthermore, we analyzed the relations of the antenna factors, the heights of receive antennas and the radiation patterns. We also found that the predicted calibration results can be close to the practical ones by including the effects of radiation patterns. The other research is to study the issue about the ground plane size of a test site. The ground plane size of a qualified test site must be larger than the minimum size defined by C63.7. For this reason, we provide a method which combines the tilted antennas measurement with a trapezoid shape ground. By using this method in the smaller ground size, we can obtain the measured results close to those obtained in the larger ground size. This method can effectively reduce the required ground size and then decrease the installation cost of a test site. Meanwhile, this method can be applied for both of the horizontal and vertical polarizations.

目錄
致謝 I
摘要(中文) III
摘要(英文) IV
目錄 V
圖表目錄 VII
第一章 研究背景和目的 1
第二章 標準場方法估算天線因子 5
2.1 標準場方法和場衰的推導 5
2.2 搜尋接收天線高度對天線因子的影響 18
2.3 Edmax的計算和影響 19
第三章 標準場方法在高頻上的驗證 24
3.1 相位中心和場型匹配方法(PCPM) 24
3.2 水平和鉛直極化的比較 29
3.3 高頻上接地面耦合效應的影響 32
3.4 由PCPM方法驗證場型影響 34
3.5 接收天線高度的討論 43
第四章 開放空間測試場地的理論 45
4.1 Fresnel Zone 原理 45
4.2 Rayleigh 準則 50
4.3 接地面導電係數對天線因子量測的影響 53
4.4 地面反射波的場衰修正項 56
第五章 縮小量測場地面積的方法 62
5.1 改善方法的構思和比較 62
5.2 量測水平和鉛直極化的改善方法 67
5.3 斜向方法的討論 80
5.4 建立一個最佳化的近場縮小面積量測模式 83
第六章 結論 96
參考文獻 98

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