A Compact and Broadband Meta-surface Antenna with Multi-mode Resonances

This paper presents a novel approach to designing a compact meta-surface antenna with broadband capabilities by exciting three resonant modes. The key components of the proposed antenna include a 4 × 3 aperiodic meta-surface plane and a slot-coupled feeding structure. The meta-surface is carefully engineered to exhibit a negative resonance mode, which contributes to the overall compactness of the antenna design. To achieve wideband performance, three specific modes: antiphase TM
(−21)
, TM
(−20)
, and TM
(−10)
excited by designing the coupling slot. These modes are selected for a are broad frequency range, enabling the antenna to operate effectively across multiple applications. The final result has a bandwidth of 1.35 GHz with 47.6% fractional bandwidth and a size of 0.32 × 0.31 × 0.03λ
³
@2.45 GHz, which can be widely used in Internet of Things (IoT) applications.