Broadband low-profile antenna based on polarization dependent metasurface structure

Abstract

The invention discloses a broadband low-profile antenna based on a polarization dependent metasurface structure. The antenna comprises an upper-layer dielectric substrate and a lower-layer dielectricsubstrate which are placed in a double-layer stacking manner, the upper surface of the upper dielectric substrate is printed with a polarization-dependent metasurface structure, and the lower surfaceof the upper dielectric substrate is printed with a metal floor with a coupling gap. The upper surface of the lower dielectric substrate is attached to the metal floor, and the lower surface is printed with a feed network. The energy is inputted from the feed network, and is coupled to the polarization-dependent metasurface structure with the multi-resonance characteristic through the coupling gapin the metal floor to directionally radiate the energy upwards, so that the broadband low-profile antenna based on the polarization-dependent metasurface structure is realized. Compared with a classic microstrip patch antenna, the low-profile antenna can achieve a wider bandwidth and a higher gain while achieving a low profile. Compared with a periodic metasurface antenna, the design freedom degree is improved while certain periodicity is guaranteed. The antenna is simple in structure, is easy to process, and can be produced at a large scale.

Description

technical field [0001] The invention relates to the field of metasurface antennas, in particular to a broadband low-profile antenna based on a polarization-dependent metasurface structure. Background technique [0002] With the development of modern wireless communication systems, the demand for wideband antennas is increasing. Microstrip patch antennas have attracted much attention due to their low profile, light weight, low cost, and easy compatibility with printed circuits. However, the traditional microstrip patch antenna has a narrow impedance bandwidth, although there are many techniques to overcome this shortcoming, such as the use of capacitive probe feeding (H.W.Lai, K.M.Luk, “Design and study of wide-band patch antenna fed bymeandering probe”, IEEE Trans.Antennas Propag., vol.54, pp.564-571, 2006.), L probe feeding (K.-F.Lee, K.-F.Tong, “Microstrip patch antennas- basic characteristics and some recent advances”, Proc.IEEE, vol.100, no.7, pp.2169-2180, Jul.2012.),...

AI Technical Summary

Problems solved by technology

Compared with the traditional microstrip patch antenna, although the profile is greatly reduced, the bandwidth advantage is not obvious

The current metasurface antennas are basically arranged periodically in the form of completely symmetrical units, such as square, square ring, circular and other structures. Not only the realized bandwidth is relatively limited (<35%), but also the design freedom is relatively limited.

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