Abstract
A dual-band structure-reused antenna with quasi-elliptic bandpass feature is proposed in this communication. The antenna consists of a cavity-backed slot array working at $K$ -band (24.2–26.1 GHz) and a frequency selective surface (FSS), which is transparent to the $K$ -band radiation and also reused as a radiator at $S$ -band (2.5–2.7 GHz). The FSS unit cells are designed based on the cross-slot structure. By introducing asymmetric boundaries to each unit cell, the FSS obtains high-frequency selectivity with two transmission zeros located on each side of the passband. The proposed antenna is fabricated and measured. The measurements have a good matching with the simulations.
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