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In this paper, a multi-beam antenna based on metasurface is proposed. By employing the metasurface as radiating element, steering the beam in the elevation plane is realized. Also, the substrate placing above the metasurface helps to further improve the beam performance. The results indicate that the realized the antenna radiate four beam pointing at (θ , φ) = (32Based on this, by adjusting the feeding network, beam is steered in azimuth plane. When the length of the left patch decrease from 11.95 mm to 10.45 mm, the azimuth angle of four beams can be adjustable between 090 • ∼112 • , 180 • ∼202 • , 270 • ∼292 • , respectively. INDEX TERMS Metasurface, multibeam antenna, patch antenna, beamforming.

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In this paper, a compact four-element quasi-self-complementary (QSC) ultra-wideband (UWB) multiple-input multiple-output antenna with triple band-notched characteristics is proposed. Coplanar waveguides fed QSC structure is designed as radiation element to achieve wideband and small size. Besides, regular hexagonal split-ring resonators with single negative properties are designed and added on the back of the substrate to obtain high isolation in the whole operating band. Moreover, a double-fork-shaped slit is etched in each radiating element to generate three notched bands covering 3.63–4.24, 5.15–5.98, and 7.17–8 GHz. The experiment results indicate that the isolation of the proposed antenna is higher than 22 dB and the peak gain varies from 2.5 to 6.7 dB in the entire band of 3–18 GHz, which demonstrates that it is suitable for UWB applications.

In this paper, a miniaturized integrated frequency selective surface (FSS) is proposed. It is composed of two parts: the band‐stop FSS and band‐pass FSS. Through introducing six capacitors between the hexagonal gap of band‐pass FSS, a miniaturized dimension of 0.07λ0 × 0.07λ0 × 0.036λ0 (λ0 is the wavelength of the transmission band in free space) is achieved. As a result, the presented FSS effectively avoids grating lobes and remains stable when the incident angle changes. In addition, by coupling between the band‐stop and band‐pass FSSs, the ultra‐wide‐band absorption is realized. The results show that the insertion loss at 2.2 GHz is only 0.6 dB and the bandwidth with the absorptivity larger than 90% is 12.6 GHz (6.8–19.4 GHz). Besides, the integrated FSS has good polarization and angular stability.