本論文採用液晶高分子(LCP)軟性基板微加工過程的28 GHz 毫米波射頻晶片上集 成電路帶通濾波器的設計和實現，LCP 軟性基板的濾波器中採用具有低損耗和兩個傳 輸零點的平面環形諧振器結構，已發現具有良好Dk 和Df 電性能的LCP 軟板是在毫 米波應用上傑出的材料。研究諧振器上不同斜角長度對濾波器反射損耗(Return loss)和 通帶帶寬的敏感性。帶通濾波器中心頻率為25 GHz，反射損耗(Return loss)於-10 dB 以下操作的頻率範圍在18.77~31.94 GHz，且插入損耗(Insertion loss)能達到-0.36 dB， 實驗結果顯示模擬和量測具有高度的一致性。

This paper presents the design and implementation of a 28-GHz millimeter-wave RF-integrated-circuit-on-chip bandpass filter using a standard liquid Crystal Polymer (LCP) micromachining process. A planar ring resonator structure with dualtransmission zeros was adopted in the design of this LCP-based filter. The LCP substrate with good Dk and Df electrical properties is found to be a prominent material especially in the millimeter-wave applications. The component size is 𝟖 × 𝟖. 𝟏 × 𝟎. 𝟏 𝐦𝐦𝟑 . The investigations of sensitivity to the return loss and passband bandwidth for different mitering corner shape are also studied. The filter has a 3-dB bandwidth of about 13 GHz (18.77~31.94 GHz) at the center frequency of 25 GHz. The measured insertion loss of the passband is about 0.36 dB, and the return loss is better than 10 dB within the passband.