A high isolation W-band MMIC drain type cascode single balanced mixer

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• 作者：Sang Jin Lee ; Tae Jong Baek ; Min Han ; Seok Gyu Choi ; Dong Sik Ko ; Sam Dong Kim ; Jin Koo Rhee ; ^{jkrhee@dgu.edu}
• 关键词：Cascode drain type mixer ; Single balanced ; MHEMT ; MMIC
• 刊名：Current Applied Physics
• 出版年：2012
• 期刊代码：15_15671739
• 类别：ph
• 出版时间：May, 2012
• 卷：12
• 期：3
• 页码：773-777
• 文件大小：943 K

摘要

We present a high isolation W-band MMIC drain type cascode single balanced mixer of high LO-to-RF isolation and wide band with conversion characteristic using the high directivity monolithic tandem couplers and 0.1聽渭m GaAs-based metamorphic high electron mobility transistors (MHEMTs). The fabricated mixer consists of two cascode MHEMT mixers and two tandem couplers using the air-bridge crossovers. We establish a drain type cascode mixer structure where the LO signal is applied to the drain port in the mixing component of common source MHEMT circuit. The tandem coupler exhibits good couplings (2.92-3.8聽dB), low return losses (鈭?2.7聽dB), and isolations (15.4-39.2聽dB) in a wide bandwidth of 75-110聽GHz. The mixer shows a conversion loss of 9.8聽dB at 94聽GHz, an output P1dB of 鈭?4.8 dBm at LO frequency of 94.542聽GHz, and LO-to-RF isolations of 29.5-39.5聽dB at 94-100聽GHz.