Ultra-wideband circularly polarized metasurface antenna based on novel hybrid feed network

Abstract

The invention discloses an ultra-wideband circularly polarized metasurface antenna based on a novel hybrid feed network, which comprises three metal layers and two dielectric layers, namely a top metal layer, an upper dielectric layer, a middle metal layer, a lower dielectric layer and a bottom metal layer in sequence from top to bottom. The top metal layer is a metasurface array, and the middle metal layer is a metal layer provided with orthogonal rectangular gaps; the bottom metal layer is a designed novel hybrid feed network and comprises three equally-divided two-port power dividers and two groups of ultra wide band phase shifters formed by coupling lines in different phase shift periods, and the two groups of phase shifters are in 180-degree rotational symmetry by taking the central axis of the structure as the center; four ports of the hybrid feed network are four ultra-wideband microstrip ports with phase shifts of 0 degree, 90 degrees, 180 degrees and 270 degrees, which is the key for realizing ultra-wideband circular polarization. The metasurface antenna can obtain ultra-wideband circular polarization performance, and the requirement of wireless communication for higher circular polarization bandwidth due to frequency band increase is met.

Description

technical field [0001] The invention relates to an ultra-wideband circularly polarized metasurface antenna based on a novel hybrid feed network, belonging to the field of microwave antennas. Background technique [0002] With the continuous increase of the amount of wireless communication data, more and more electromagnetic wave bands are used, so the demand for antenna bandwidth is also increasing. The application of metasurfaces in microwave antennas makes the antennas present significant broadband characteristics, which brings There have been many related studies. [0003] Signal fading in wireless communication can be explained by multipath effects. The linearly polarized waves radiated by linearly polarized antennas are significantly affected by multipath fading, especially in bad weather, while the circularly polarized waves radiated by circularly polarized antennas can significantly improve Signal fading caused by multipath effects. [0004] In recent years, there h...

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Problems solved by technology

[0004] In recent years, there have been many structures that study circular polarization based on metasurface antennas. However, among the effects of these structures, the frequency range covered by circular polarization is significantly smaller than the bandwidth of the antenna, which makes the bandwidth utilization of the antenna low. , which weakens the effect of introducing metasurfaces to generate broadband, so further exploration of wider circularly polarized bandwidths based on metasurface antennas is a problem worth studying

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