Low loss and wide bandwidth wireless signal transmission structure between IC chips is realized with electromagnetic coupling of open-ring resonators. Open-ring resonators are placed on separate sapphire substrate and they are stacked, then, microwave signals with the resonant frequencies are passed to the other resonator through sapphire substrate. With 960 mm diameter rings, 18 GHz band signals are transmitted through 200 mm sapphire substrate. The transmission losses were only À1:54 dB and the bandwidth was 4.8 GHz wide. Since the structure is simple and insensitive to misalignments, the structure will be conveniently used for wireless or non-contact signal transmission for short distances. #

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Two broad-side coupled open ring resonators are used for signal interconnect between two substrates. Design method and estimation of transmission loss are shown. It is clarified that the radiation loss is most important and its reasonable suppression is possible. Simulation result is confirmed by experiment.