Metasurface-Based Lens for Antenna Gain Enhancement and Radar Cross Section Reduction

Jianing Yang,Xin Xie,Jiakun Song,Xu Zhang,Cheng Huang,Xiangang Luo

doi:10.1109/jphot.2019.2950194

Jianing Yang, Xin Xie + Show 4 more

Open Access

https://doi.org/10.1109/jphot.2019.2950194

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Abstract

In this paper, leveraging the resonant phase and the geometry phase simultaneously, we demonstrated a low scattering lens antenna, which can work at both transmission and reflection mode. Different from the traditional microwave lens which only realizes wavefront shaping in half-space, the proposed metasurface lens not only squeezes the transmitted divergent beam to improve the gain of the conventional circular-polarized antenna, but also scatters the electromagnetic wave to maintain a low reflection property in broadband. The proposed lens antenna working in full space may provide a new approach for an integrated communication system.

Highlights

Antenna, as the terminal of the communication systems, plays an irreplaceable role in signal transmitting and receiving
The beam focusing performance is examined by the vector diffraction method as seen in Fig. 4(c), the bright spot at the plane of the focal length proves that transmission phase distribution is able to help the metasurface lens to converge all the outgoing wave energy into the position of z = 40 mm
We demonstrated a bi-functional metasurface lens antenna which can enhance the gain and reduce the RCS of the lens antenna simultaneously

Summary

Introduction

As the terminal of the communication systems, plays an irreplaceable role in signal transmitting and receiving. It is a main contributing source to the overall RCS of the communication systems. Reducing the RCS while maintaining the gain of the antenna is crucial to some military communication platform. Traditional methods to reduce the RCS are focusing on the shaping of target surface [1] and applying the absorbing materials. The absorbing materials are capable of absorbing the incident wave and converting it to heat. Both the two methods will degrade the radiation performance of the antenna. Some researchers have proposed various low-scattering antennas to eliminate the contradiction between the scattering and radiation, including electromagnetic(EM) band-gap [3]– [5] and frequency selective surface. [6], [7] most of them pay less attention to enhancing the radiation performance of the antennas

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Results

Conclusion