MEMSスイッチを用いたフェイズドアレイアンテナの基礎検討

概要

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In order to study the basic subjects needed to realize phased-array antennas especially for mobile system applications, we have developed core components for the antenna. Wilkinson power divider, a switched-line phase shifter, a single-element patch antenna and a 4-element patch array antenna were designed for 2.5 GHz operation. Low loss MEMS shunt switches were employed for the phase shifter. All the circuits were formed on a glass-epoxy base printed circuit board. The circuit patterns were designed based on the simulation by Sonnet, a 3D planar electromagnetic field solver software. Good performance was achieved in these components, e.g., the transmission coefficient (S21) of -1.8 dB with 91.8 degrees phase shift for a phase shifter, the reflection coefficient (S11) of -27 dB for a single-element antenna and the reflection coefficient (S11) of -34 dB for a patch array antenna. Also, the design accuracy for the core components was confirmed throughout this work.