共面波導之轉接(2/3) ; Coplanar Waveguide Transition(2/3)

本研究計畫的重點共分為兩部分，第一部份在於共面波導至矩形波導的模向 轉接，第二部分則是有關共面波導的覆晶轉接。第一年我們模擬了一些Ka 及Q 頻段的轉接，於第二年的進程中，我們將這些模擬的結果，實際製作電路並量測， 得到吻合度不錯的模擬和量測結果。其一，在共面波導至矩形波導的轉接方面， 其反射損耗在15dB 以下的頻寬約有40%左右，可謂相當的寬頻;除此之外，我們 也嘗試在V 頻段設計此轉接，其反射損耗在15dB 以下的頻寬約有16%左右，所 得頻寬並不如前者優異，此乃受限於高介電係數的板材之緣故。其二，在改良式 共面波導的覆晶轉接方面，反射損耗在20dB 以下的頻寬，可從DC 延伸至 35GHz，也可謂相當不錯。 ; The project emphasizes at two parts: one is the transition from the Coplanar Waveguide (CPW) to the rectangular waveguide (RWG) and the other is the flip-chip transition. The transitions designed in the first year are realized in the Ka- and Q-bands in the second year. The measurement results show reasonable agreement with the simulation results. For the CPW to RWG transition, the transition realized in the Q-band has a bandwidth of 40% in which the return loss is better than 15dB. Compared with the traditional CPW to RWG transition, the bandwidth is very large and the size is small. Also, the idea is extended to the V-band and a bandwidth of 16% in which the return loss is better than 15dB is obtained. The smaller bandwidth is limited by the Al2O3 substrate of high dielectric constant. For the improved flip-chip transition, the return loss is larger than 20 dB in the frequency range from DC to 35 GHz, demonstrative of really a wideband design.