傳統平板微帶天線在平面設計結構上一直以來深具大眾喜愛,其優點不外乎低成本，設計容易以及易以射頻整合。然而，在設計與應用上卻因頻寛限制、低增益與表面波以及高次諧波所拘束。因此,在本論文中,我們採用二種方式能夠壓抑高次諧波的方法，其一為利用光子能隙(PBG)使其在特定的頻帶下產生禁帶的功能，進而壓抑高次諧波並提昇天線的增益。其二則為利用缺陷接地結構(DGS)將吾想要的頻段形成帶拒濾波器，進而壓抑高次諧波，並附有理論的驗証。

　　The microstrip patch antenna is for their advantages of low cost, low profile and easily integration with RF devices by far the most widely used as a low-profile planar
structure. However, design and applications of onventional patch antenna have been mainly limited for their restrict bandwidth, low gain, and surface wave effects. These thesis consists of two parts. The first part of thesis resents that it can product bandstop performance in special frequency band by using PBG (Photonic Band Gap ). At the same time, it can be suppressed high order harmonic frequency and improved the gain of patch antenna. The second part of thesis presents that it can form notch ilter in our except frequency band by using DGS (defected ground structure),to suppress high order harmonic frequency, and the theory will be proved in the following.

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