A Phase Conjugating Metasurface

This paper presents the design of a phase conjugating metasurface operating at 10 GHz. The designed metasurface achieves phase conjugation, by heterodyning (mixing) an incident RF signal with a pump (modulation) signal at twice the frequency of the incident RF signal. Frequency mixing is achieved through the use of fast switching Schottky diodes. The unit cell of the metasurface is composed of a subwavelength metallic patch that is aperture coupled to the heterodyning circuit. Metasurfaces offer a low-profile alternative to retrodirective antenna arrays. Such metasurfaces could play a key role in far-field wireless power transfer systems.