應用於無線區網的低溫陶瓷共燒寬頻混頻器與低溫陶瓷共燒濾波器

Abstract

在本論文中，將呈現利用低溫陶瓷共燒技術實現寬頻混波器與三階交錯耦合梳形濾波器及利用多層結構實現Marchand平衡轉換器於無線網路IEEE802.11a (5.2GHz, 5.7GHz) and 802.11b (2.4GHz)應用的研發. 由於多層結構Marchand平衡轉換器的相速度不相等，造成輸出端的訊號在強度與相位上更不平衡，探討Marchand平衡轉換器的相速度補償且藉由補償的方式改善其效能且相當的卓著。 當實現低溫陶瓷共燒寬頻混波器時，由於螺旋型態的夾層耦合帶線，亦會造成相速度的不相等，因此，藉由補償的方式使得混頻器更加寬頻。 最後，設計在低於通帶端有一傳輸零點的三階交錯耦合梳形濾波器，使得在低止帶處有較高的衰減量，並抑制所有的低頻訊號，另外，其相當寬的上止帶與位於上止帶的零點，更能抑制二倍頻與三倍頻的訊號。

This thesis presents the development of the broadband mixer and the three-pole combline filter with cross-coupling using Low temperature cofired ceramics (LTCC) technology and the Marchand balun using the multilayer structure for IEEE802.11a (5.2GHz, 5.7GHz) and 802.11b (2.4GHz) wireless LAN applications. The difference in phase velocity of the Marchand balun in multilayer structure makes the amplitude and phase more unbalanced at output ports. Compensating the difference in phase velocity of the Marchand balun is studied and it can improve the performance of the Marchand balun significantly. When implementing LTCC broadband mixer, the difference in phase velocity also can be found due to the spiral broadside coupled stripline. Therefore, compensation in phase velocity increases the bandwidth of the mixer. Finally, the design of the three-pole combline filter with cross-coupling with the characteristic of having transmission zeros at the low-side skirt can generate a high attenuation rate and suppress all the lower stopband signals. Beside, the filter with broad stopband and transmission zeros at the high-side skirt can suppress the second harmonic and third harmonic.