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A New Cavity Resonance Assisted by Anisotropic Metasurfaces

A new resonance phenomenon is demonstrated in waveguide cavities, which simultaneously uses two orthogonal modes (polarizations). This resonance is formed by bouncing waves with similar handedness, between two simple anisotropic metasurfaces having a relative rotation angle. The rotated anisotropic metasurfaces can cross couple the waves from one polarization to the other at the cavity end. The field profile of the resonant mode does not exhibit nodes and antinodes, thus the resonant frequency is not solely determined by the cavity length, unlike common resonators. The resonance condition is theoretically demonstrated from both field and transmission line perspectives, and is validated by simulations showing the existence of the new resonance. The concept is experimentally demonstrated in an X-band dual-mode circular waveguide, demonstrating a very short cavity resonance. The concept brings new possibilities for resonator design with size and tunability benefits at different frequencies.