Abstract
This letter presents a null-filled high-gain airborne antenna with metasurface for emergency communication. The proposed antenna consists of a monopole with two metal feeding loops, a metal cylindrical cavity and metasurface radome (MSR). By cutting the corners of the monopole and adding two loops, the aim is to direct vertical radiation electromagnetic waves. The cavity and MSR are used to achieve vertical null-filled radiation performance with high gain. Simulated and measured results exhibit that the antenna has a −10 dB bandwidth of 0.8–1.0 GHz, covering the emergency communication band, with a high gain (5.0–6.7 dBi). Furthermore, the null-filled level of the vertical radiation E-plane of the antenna is higher than −4.6 dB, and the H-plane maintains horizontal omnidirectional 360°radiation. The proposed airborne antenna is a good contender for emergency communication and also provides ideas for the antenna to meet both vertical null-filled and horizontal-omnidirectional radiation.
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