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The authors have investigated on the spatial fading emulator comprised of multiple antenna elements emulating the spatially distributed scatterers to generate the fading in the reproducible manner since 2001. This paper presents the history of early development until 2010 when MIMO OTA test was a very popular topic. The motivation, ideas and achievement are reviewed and summarized, because some important...
A new structure for a ‘metamaterial’ ridged waveguide with the ability to control wavelength is proposed. The structure has the remarkable features of a wide control-range in wavelength from the fast-wave to slow-wave regions across the TEM wavelength in free space, and a waveguide impedance-control function that is independent of wavelength. This feature can improve the performance of array antennas...
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