The Structures of CPW PHEMT's for Applications of Millimeter-Waves(<Special Section>Papers Selected from 2003 International Technical Conference on Circuits/Systems, Computers and Communications(ITC-CSCC 2003))

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The parasitic capacitances induced in the spaces between an air-bridge interconnection and a drain pad (C_<ad>), and between an air-bridge interconnection and a gate head (C_<ag>) from a power CPW PHEMT are not negligible. In this paper, a modified equivalent circuit model for a CPW PHEMT and an improved CPW PHEMT for millimeter-wave applications are proposed. These were proved by measuring the fabricated CPW PHEMT and improved CPW PHEMT. These capacitances were confirmed by measuring the gate-source coupling using CPW PHEMT patterns without an active layer. From the measurements, the improved CPW PHEMT has the lowest coupling (loss) and the highest S_<21> gain among four different types tested at 60GHz. And the improved CPW PHEMT is a feasible device which can be directly applied in millimeter-waves as a power device.
社団法人電子情報通信学会の論文
2004-06-01