Single‐Layer Miniaturized Wideband Antenna Based on Stub‐Loaded Metasurface

ABSTRACT This paper proposes a single‐layer miniaturized wideband antenna based on the stub‐loaded metasurface (MS) structure. The stub is loaded at the edge of a square MS cell and inserted into the gap between two adjacent cells, enhancing the surface capacitance and reducing the resonance frequency. Consequently, the stub‐loaded MS structure can provide the resonance frequency of the conventional square MS structure while having a smaller aperture. In this way, a miniaturized wideband MS antenna based on the stub‐loaded MS structure is designed. It has a bandwidth of 41% (4.5−6.82 GHz) and a compact size of (where is the wavelength at the center frequency). Subsequently, based on this miniaturized MS antenna, the partial peripheral cells, which initially have little effect on radiation, are modified to obtain a sufficiently excited radiation aperture, resulting in a larger bandwidth of 47% (4.61−7.43 GHz) with a size of . Compared with the conventional MS antenna, the proposed antenna is 70% smaller in size while having a larger bandwidth and a simple single‐layer structure.