本論文主要在於討論印刷式八木天線其各種參數對天線的影響，並在尋找簡易設計程序的原則下，簡化設計參數。這些參數包括元件的長度，天線饋入結構以及這元件間距。根據這些基本的探討，將會提出設計印刷式八木天線之準則、探討天線方向性、頻寬與背向輻射比等性能，並提出簡易的快速設計程序。在論文，亦將提出新的反射子結構。在不明顯的影響天線方向性下，此新結構將有效地提高背向輻射比。

The goal of the thesis is to study the effects of many arguments, including the dimensions and the feeding structure of the printed Yagi antenna, on the center frequency, mid-band gain, and front-to-rear(F/R) ratio. Then, the guidelines of the antenna design will be proposed based on the simulation results. Basically, using the traditional configuration of the printed Yagi antenna, the mid-band gain or the F/R ratio cannot be improved without scarifying the other. Therefore, at the end of the thesis, a novel reflector formed by multiple dipoles is proposed. Through simulations and measurements, it is found the proposed configuration highly improves the F/R ratio while the mid-band gain remains almost unchanged.

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