An Efficient Infinite Channel Traveling Wave-Surface Wave Antenna and Its Implementation Method

Abstract

The invention discloses an efficient infinite channel traveling wave-surface wave antenna and a realization method thereof. The invention adopts a scattering array and an artificial surface plasmon SSP hyperbolic metasurface; the traveling wave of TE polarization is incident on the scattering array at any angle δ, and the additional Froquois wave vector will be introduced into the transmitted wave. When the iso-frequency dispersion curve of the SSP hyperbolic metasurface satisfies the wave vector matching condition, the evanescent wave transmitted from the scattering array can efficiently excite artificial surface plasmons on the SSP hyperbolic metasurface. The present invention can not only realize traveling wave-surface wave coupling of infinite channels, but also has high efficiency; when the incident angle is less than 44°, the total coupling efficiency of TE polarized incident traveling waves exceeds 50%. At 0° incidence, the maximum coupling efficiency can reach 91.9%; the invention is not limited to the microwave band, and in the terahertz band, an infinite channel traveling wave-surface wave antenna can also be obtained by applying the method.

Description

technical field [0001] The invention relates to the field of microwave frequency band surface wave antennas, in particular to an efficient infinite channel traveling wave-surface wave antenna and a realization method thereof. Background technique [0002] A surface wave is an electromagnetic wave with a propagation constant greater than that of a free-space wave vector attached to the surface of a structure. Its unique subwavelength local attachment and local field enhancement properties make it have great application prospects in the fields of super-resolution imaging, new photonic integrated circuits, perfect absorbing materials, on-chip terahertz wave sources and biosensing. Due to the huge wave vector mismatch between surface waves and space traveling waves, it is a great challenge to achieve efficient and flexible coupling of space traveling waves to surface waves. To overcome this difficulty, many traditional antennas that can compensate for wave vector adaptation, su...

AI Technical Summary

Problems solved by technology

However, the increase in the number of channels brought by these methods is extremely limited (no more than 4 in theory), and these channels are discrete

This means that when the incident traveling wave is slightly shifted from the specified incident angle, the traveling wave-surface wave coupling efficiency of the designed antenna will be greatly reduced

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