本論文應用美國REMCOM公司之時域有限差分套裝模擬軟體XFDTD，來建構手持式讀取器天線之分析模型並進行模擬。研究中設計了一些適用於915MHz之手持式讀取器天線，其手持式讀取器天線之特性必須有高前後增益比以避免電磁波往人體輻射，另外，因為標籤（Tag）的回覆信號微弱，故讀取器反射損失S11要相當低才能接收到標籤發射的信號。而後測量實作讀取器天線的反射損失S11與遠場輻射場型，其結果與套裝模擬軟體XFDTD之模擬結果相當吻合，驗證了模擬軟體與分析模型的正確性。
此外，本研究亦分析13.56MHz讀取器天線之工作特性，以得知影響13.56MHz讀取器讀取距離之要素，並應用電磁數值分析軟體HFSS評估13.56MHz讀取器之讀取距離，以瞭解週遭環境對於讀取距離所造成之影響。

This thesis applies a finite difference time domain simulation software package, XFDTD from Remcom inc. The XFDTD is employed to develop the analysis model of the portable reader antennas and to perform simulations. Some portable reader antennas for applications in the 915MHz have been designed, and their property is high front to back ratio to avoid electricmagnetic wave radiate to the user. Beside the return loss of the reader is small enough to receive the signal of the tag, because the answer signal of the tag is very weak. After manufacturing the portable reader antenna, the parameters which are the return loss S11 and radiation pattern have been measured for a design of the portable reader antenna. Good agreements between measurements and XFDTD simulations are obtained, which verify the program simulations.
In addition, this research also analyses the reader antenna in the 13.56MHz, and obtain the factor influence response distance of the reader in the 13.56MHz, further apply HFSS to estimate response distance of the reader in the 13.56MHz, then we can find out the influence for reader from surrounding area environment.

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