A kind of triple-band low-profile shared-aperture cavity antenna with AMC metamaterial

This study designed a kind of novel triple-band, low-profile, shared-aperture, and high-gain cavity antenna by incorporating an artificial magnetic conductor (AMC) metamaterial. An AMC metamaterial plate capable of acting as mu-negative metamaterials (MNGs) at three distinct frequencies was developed; serving as the covering layer of the cavity antenna, this plate was constructed with three patch antennas as radiation sources. Fabricated in the printed circuit board technology, the antenna was thoroughly tested in an anechoic chamber, and the experimental outcomes demonstrated excellent congruence with the simulation data. Notably, operating at 6.33, 9.48, and 10.80 GHz, the three radiation sources of the antenna can effectively share a single radiation aperture, achieving impressive gains of 14.2 dBi, 17.3 dBi, and 12.3 dBi, respectively. As a breakthrough, this technology overcomes the limitation of traditional cavity antennas, which are often constrained to single-frequency operation. Furthermore, the antenna cavity developed in this study boasts a minimal thickness of only 10 mm, significantly slimmer than the conventional half-wavelength thickness limit of resonant cavities. In summary, by combining such advantages as low profile, triple-frequency capability, high gain, and extensive integration, this innovative antenna meets the requirements for antenna components in the new generation of wireless communication systems.